bot_navigate.cpp

// This is an open source non-commercial project. Dear PVS-Studio, please check it.
// PVS-Studio Static Code Analyzer for C, C++, C#, and Java: http://www.viva64.com
//
// FoXBot - AI Bot for Halflife's Team Fortress Classic
//
// (http://foxbot.net)
//
// bot_navigate.cpp
//
// Copyright (C) 2003 - Tom "Redfox" Simpson
//
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See the GNU General Public License for more details at:
// http://www.gnu.org/copyleft/gpl.html
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//

#include "extdll.h"
#include "util.h"

#include "bot.h"
#include "waypoint.h"

#include "bot_func.h"
#include "bot_job_think.h"
#include "bot_navigate.h"

#include <algorithm>
#include <optional>

#include "bot_weapons.h"
#include "bot_visibility.h"

extern bot_weapon_t weapon_defs[MAX_WEAPONS];
extern edict_t* clients[32];
extern bot_t bots[32];

extern int mod_id;
extern WAYPOINT waypoints[MAX_WAYPOINTS];
extern PATH* paths[MAX_WAYPOINTS];
extern int num_waypoints; // number of waypoints currently in use

extern bool g_waypoint_on;

extern edict_t* pent_info_ctfdetect;
extern float is_team_play;
extern bool checked_teamplay;

extern int bot_use_grenades;
extern bool bot_can_use_teleporter;

// Rocket jump globals
extern int RJPoints[MAXRJWAYPOINTS][2];

int CheckTeleporterExitTime = 0;

// extern int flf_bug_fix;
extern bool g_bot_debug;

extern float last_frame_time;

// bit field of waypoint types to ignore when the bot is lost
// and looking for a new current waypoint to head for
static constexpr WPT_INT32 lostBotIgnoreFlags = 0 + (W_FL_DELETED | W_FL_AIMING | W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_TFC_DETPACK_CLEAR | W_FL_TFC_DETPACK_SEAL | W_FL_SNIPER | W_FL_TFC_TELEPORTER_ENTRANCE |
																	  W_FL_TFC_TELEPORTER_EXIT | W_FL_TFC_JUMP | W_FL_LIFT | W_FL_PATHCHECK);

int spawnAreaWP[4] = { -1, -1, -1, -1 }; // used for tracking the areas where each team spawns
extern int team_allies[4];

// FUNCTION PROTOTYPES
static int BotShouldJumpOver(const bot_t* pBot);
static int BotShouldDuckUnder(const bot_t* pBot);
static bool BotFallenOffCheck(bot_t* pBot);
static bool BotEscapeWaypointTrap(bot_t* pBot, int goalWP);
static bool BotUpdateRoute(bot_t* pBot);
static void BotHandleLadderTraffic(bot_t* pBot);
static void BotCheckForRocketJump(bot_t* pBot);
static void BotCheckForConcJump(bot_t* pBot);

// This function allows bots to report in the waypoint they last spawned
// nearby.
// This should be run each time a bot spawns, so as to keep the information
// up to date on maps such as warpath where the spawn areas keep changing.
void BotUpdateHomeInfo(const bot_t* pBot) {
	if (mod_id != TFC_DLL)
		return;

	// if the spawn location is totally unknown try to update it now
	if (spawnAreaWP[pBot->current_team] < 0 && pBot->f_killed_time + 15.0f > gpGlobals->time) {
		spawnAreaWP[pBot->current_team] = WaypointFindNearest_V(pBot->pEdict->v.origin, 800.0, pBot->current_team);

		return;
	}

	// keep the spawn area info up to date
	if (pBot->current_wp != -1 && pBot->f_killed_time + 4.0f > gpGlobals->time) {
		spawnAreaWP[pBot->current_team] = pBot->current_wp;
	}
}

// This function should be called each time the map changes.
// It resets the bots knowledge of where they are spawning.
void ResetBotHomeInfo() {
	// sanity check
	if (mod_id != TFC_DLL)
		return;

	spawnAreaWP[0] = -1;
	spawnAreaWP[1] = -1;
	spawnAreaWP[2] = -1;
	spawnAreaWP[3] = -1;
}

// This function should be used when the bot has just spawned and has no current
// waypoint yet, because it also updates the bots knowledge of where it spawned.
void BotFindCurrentWaypoint(bot_t* pBot) {
	int min_index = -1;
	double min_distance_squared = 640000.0; // 800 * 800 = 640000
	int runnerUp = -1;
	TraceResult tr;

	// find the nearest waypoint...
	for (int index = 0; index < num_waypoints; index++) {
		// skip unwanted waypoints
		if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING || waypoints[index].flags & lostBotIgnoreFlags)
			continue;

		// skip this waypoint if it's team specific and teams don't match
		if (waypoints[index].flags & W_FL_TEAM_SPECIFIC && (waypoints[index].flags & W_FL_TEAM) != pBot->current_team)
			continue;

		// don't give the bot the same waypoint it already has,
		// some waypoints are cursed
		if (index == pBot->current_wp)
			continue;

		// square the Manhattan distance, this way we can avoid using sqrt()
		const Vector distance = waypoints[index].origin - pBot->pEdict->v.origin;
		const double distance_squared = static_cast<double>(distance.x * distance.x) + static_cast<double>(distance.y * distance.y) + static_cast<double>(distance.z * distance.z);

		// if the waypoint is above the bot only remember it in case no
		// other waypoint could be found(higher waypoints may be unreachable)
		if (pBot->pEdict->v.origin.z + 50.0f < waypoints[index].origin.z) {
			if (runnerUp == -1 && distance_squared < 640000.0) // 800 * 800 = 640000
			{
				// check if the waypoint is visible to the bot
				UTIL_TraceLine(pBot->pEdict->v.origin, waypoints[index].origin, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

				// it is visible, so store it
				if (tr.flFraction >= 1.0f)
					runnerUp = index;
			}

			continue;
		}

		// if it's the nearest found so far
		if (distance_squared < min_distance_squared) {
			// check if the waypoint is visible to the bot
			UTIL_TraceLine(pBot->pEdict->v.origin, waypoints[index].origin, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

			// it is visible, so store it
			if (tr.flFraction >= 1.0f) {
				min_index = index;
				min_distance_squared = distance_squared;
			}
		}
	}

	if (min_index == -1)
		pBot->current_wp = runnerUp;
	else
		pBot->current_wp = min_index;

	// give the bot time to arrive at the new waypoint
	pBot->f_current_wp_deadline = pBot->f_think_time + BOT_WP_DEADLINE;

	// if the bot just spawned make sure it has a current waypoint
	if (pBot->current_wp != -1 && pBot->f_killed_time + 4.0f > pBot->f_think_time) {
		BotUpdateHomeInfo(pBot); // if the bot just spawned, report where

		//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin + Vector(0, 0, 70),
		//		waypoints[pBot->current_wp].origin,
		//		10, 2, 250, 250, 250, 200, 10);
	}
}
// This function will tell the bot to face the map coordinates indicated by v_focus
void BotSetFacing(const bot_t* pBot, Vector v_focus) {
	v_focus = v_focus - (pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs);
	const Vector bot_angles = UTIL_VecToAngles(v_focus);
	pBot->pEdict->v.ideal_yaw = bot_angles.y;
	pBot->pEdict->v.idealpitch = bot_angles.x;
	BotFixIdealYaw(pBot->pEdict);
	BotFixIdealPitch(pBot->pEdict);
}

// This function will tell the bot to face the map coordinates
// indicated by v_focus
void BotMatchFacing(const bot_t* pBot, const Vector& v_source, Vector v_focus) {
	v_focus = v_focus - (pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs);
	const Vector bot_angles = UTIL_VecToAngles(v_focus);
	pBot->pEdict->v.ideal_yaw = bot_angles.y;
	pBot->pEdict->v.idealpitch = bot_angles.x;
	BotFixIdealYaw(pBot->pEdict);
	BotFixIdealPitch(pBot->pEdict);
}

void BotFixIdealPitch(edict_t* pEdict) {
	// check for wrap around of angle...
	if (pEdict->v.idealpitch > 180)
		pEdict->v.idealpitch -= 360;
	else if (pEdict->v.idealpitch < -180)
		pEdict->v.idealpitch += 360;
}

float BotChangePitch(edict_t* pEdict, float speed) {
	const float ideal = pEdict->v.idealpitch;
	float current = -pEdict->v.v_angle.x;

	// turn from the current v_angle pitch to the idealpitch by selecting
	// the quickest way to turn to face that direction
	// find the difference in the current and ideal angle
	const float diff = fabsf(current - ideal);

	// check if the bot is already facing the idealpitch direction...
	if (diff <= 0.01f)
		return diff; // return number of degrees turned

	// should keep turn speed the same under any fps...hopefully
	speed *= gpGlobals->time - last_frame_time;
	speed *= 10;

	// check if difference is less than the max degrees per turn
   speed = std::min(diff, speed); // just need to turn a little bit (less than max)

	// here we have four cases, both angle positive, one positive and
	// the other negative, one negative and the other positive, or
	// both negative.  handle each case separately...

	if (current >= 0 && ideal >= 0) // both positive
	{
		if (current > ideal)
			current -= speed;
		else
			current += speed;
	}
	else if (current >= 0 && ideal < 0) {
		const float current_180 = current - 180;

		if (current_180 > ideal)
			current += speed;
		else
			current -= speed;
	}
	else if (current < 0 && ideal >= 0) {
		const float current_180 = current + 180;
		if (current_180 > ideal)
			current += speed;
		else
			current -= speed;
	}
	else // (current < 0) && (ideal < 0)  both negative
	{
		if (current > ideal)
			current -= speed;
		else
			current += speed;
	}

	// check for wrap around of angle...
	if (current > 180)
		current -= 360;
	else if (current < -180)
		current += 360;

	pEdict->v.v_angle.x = current + pEdict->v.punchangle.x;
	pEdict->v.angles.x = pEdict->v.v_angle.x / 3;
	pEdict->v.v_angle.x = -pEdict->v.v_angle.x;
	pEdict->v.angles.z = 0;

	return speed; // return number of degrees turned
}

void BotFixIdealYaw(edict_t* pEdict) {
	// check for wrap around of angle...
	if (pEdict->v.ideal_yaw > 180)
		pEdict->v.ideal_yaw -= 360;
	else if (pEdict->v.ideal_yaw < -180)
		pEdict->v.ideal_yaw += 360;
}

float BotChangeYaw(edict_t* pEdict, float speed) {
	const float ideal = pEdict->v.ideal_yaw;
	float current = pEdict->v.v_angle.y;

	// turn from the current v_angle yaw to the ideal_yaw by selecting
	// the quickest way to turn to face that direction
	// find the difference in the current and ideal angle
	const float diff = fabsf(current - ideal);

	// check if the bot is already facing the ideal_yaw direction...
	if (diff <= 0.01f)
		return diff; // return number of degrees turned

	speed *= gpGlobals->time - last_frame_time;
	speed *= 10;

	// check if difference is less than the max degrees per turn
   speed = std::min(diff, speed); // just need to turn a little bit (less than max)

	// here we have four cases, both angle positive, one positive and
	// the other negative, one negative and the other positive, or
	// both negative.  handle each case separately...
	if (current >= 0 && ideal >= 0) // both positive
	{
		if (current > ideal)
			current -= speed;
		else
			current += speed;
	}
	else if (current >= 0 && ideal < 0) {
		const float current_180 = current - 180;
		if (current_180 > ideal)
			current += speed;
		else
			current -= speed;
	}
	else if (current < 0 && ideal >= 0) {
		const float current_180 = current + 180;
		if (current_180 > ideal)
			current += speed;
		else
			current -= speed;
	}
	else // (current < 0) && (ideal < 0)  both negative
	{
		if (current > ideal)
			current -= speed;
		else
			current += speed;
	}

	// check for wrap around of angle...
	if (current > 180)
		current -= 360;
	else if (current < -180)
		current += 360;

	pEdict->v.v_angle.y = current + pEdict->v.punchangle.y;
	pEdict->v.angles.y = pEdict->v.v_angle.y;
	pEdict->v.angles.z = 0;

	return speed; // return number of degrees turned
}

// This function is useful when you are trying to steer the bot towards some
// map location without using waypoints.
// For example, this function will try to make the bot jump over or duck under obstacles.
void BotNavigateWaypointless(bot_t* pBot) {
	pBot->f_move_speed = pBot->f_max_speed;
	pBot->pEdict->v.button |= IN_FORWARD;

	// give the bot time to return to it's waypoint afterwards
	pBot->f_current_wp_deadline = pBot->f_think_time + BOT_WP_DEADLINE;

	// navigating waypointless may send the bot too far from it's current
	// waypoint, so periodically try to keep it up to date
	if (pBot->f_periodicAlert1 < pBot->f_think_time) {
		if (!VectorsNearerThan(pBot->pEdict->v.origin, waypoints[pBot->current_wp].origin, 800.0) || !BotCanSeeOrigin(pBot, waypoints[pBot->current_wp].origin))
			BotFindCurrentWaypoint(pBot);
	}

	BotFallenOffCheck(pBot);

	// if not obstructed by a player is the bot obstructed by anything else?
	if (BotContactThink(pBot) == nullptr) {
		// buoyed by water, or on a ladder?
		if ((pBot->pEdict->v.waterlevel > WL_FEET_IN_WATER && !(pBot->pEdict->v.flags & FL_ONGROUND)) || pBot->pEdict->v.movetype == MOVETYPE_FLY) {
			// hopefully the bot wont get stuck
		}
		else // not on a ladder or in some water
		{
			const float botVelocity = pBot->pEdict->v.velocity.Length();

			// is the bot getting stuck?
			if (botVelocity < 50.0f) {
				const int jumpResult = BotShouldJumpOver(pBot);
				if (jumpResult == 2) // can the bot jump onto something?
				{
					pBot->pEdict->v.button |= IN_JUMP;
				}
				else {
					const int duckResult = BotShouldDuckUnder(pBot);
					if (duckResult == 2) // can the bot duck under something?
					{
						// duck down and move forward
						pBot->f_duck_time = pBot->f_think_time + 0.3f;
					}
					else // can't duck or jump - try random movement tricks
					{
						// some maps(e.g. hunted) have undetectable obstacles
						// jumping and/or ducking can overcome some of those
						if (pBot->f_periodicAlert1 < pBot->f_think_time && random_long(1, 1000) <= 501) {
							if (random_long(1, 1000) <= 501)
								pBot->pEdict->v.button |= IN_JUMP;
							else
								pBot->f_duck_time = pBot->f_think_time + random_float(0.3f, 1.2f);
						}

						// randomly switch direction to try and get unstuck
						if (pBot->f_periodicAlert3 < pBot->f_think_time && random_long(1, 1000) <= 501) {
							if (pBot->side_direction == SIDE_DIRECTION_RIGHT)
								pBot->side_direction = SIDE_DIRECTION_LEFT;
							else
								pBot->side_direction = SIDE_DIRECTION_RIGHT;
						}

						// make sure the bot isn't stuck strafing into a wall
						if (BotCheckWallOnRight(pBot))
							pBot->side_direction = SIDE_DIRECTION_LEFT;
						else if (BotCheckWallOnLeft(pBot))
							pBot->side_direction = SIDE_DIRECTION_RIGHT;

						if (pBot->side_direction == SIDE_DIRECTION_RIGHT) {
							pBot->f_side_speed = pBot->f_max_speed;
							pBot->pEdict->v.button |= IN_MOVERIGHT; // so crates can be pushed
						}
						else {
							pBot->f_side_speed = -pBot->f_max_speed;
							pBot->pEdict->v.button |= IN_MOVELEFT; // so crates can be pushed
						}
					}
				}
			}
		}
	}
}

// You should call this function when pBot->goto_wp is valid and you want
// the bot to get to it.
// Set navByStrafe to true if you wish the bot to navigate by using axial
// movement speeds only(i.e. without having to look at the next waypoint).
bool BotNavigateWaypoints(bot_t* pBot, bool navByStrafe) {
	if (num_waypoints < 1)
		return false;

	// has the bot been getting stuck a little too often?
	if (pBot->routeFailureTally > 1) {
		BotEscapeWaypointTrap(pBot, pBot->goto_wp);
		pBot->routeFailureTally = 0;
		return false;
	}

	pBot->f_move_speed = pBot->f_max_speed;
	pBot->f_side_speed = 0.0f;

	// steer away from a single wall to prevent hugging corridor walls - [APG]RoboCop[CL]
	if (pBot->enemy.ptr == nullptr && pBot->pEdict->v.flags & FL_ONGROUND) {
		const bool wallL = BotCheckWallOnLeft(pBot);
		const bool wallR = BotCheckWallOnRight(pBot);
		if (wallL && !wallR)
			pBot->f_side_speed = pBot->f_max_speed * 0.3f; // nudge right
		else if (wallR && !wallL)
			pBot->f_side_speed = -pBot->f_max_speed * 0.3f; // nudge left
	}

	// is it time to consider taking some kind of route shortcut?
	if (pBot->f_shortcutCheckTime < pBot->f_think_time || pBot->f_shortcutCheckTime - 60.0f > pBot->f_think_time) // sanity check
	{
		pBot->f_shortcutCheckTime = pBot->f_think_time + 1.0f;

		if (BotFindTeleportShortCut(pBot) == false && pBot->bot_skill < 4) {
			if (pBot->pEdict->v.playerclass == TFC_CLASS_MEDIC || pBot->pEdict->v.playerclass == TFC_CLASS_SCOUT)
				BotCheckForConcJump(pBot);
			else if (pBot->pEdict->v.playerclass == TFC_CLASS_SOLDIER)
				BotCheckForRocketJump(pBot);
		}
	}

	// try to navigate by strafing if the bot has an enemy
	if (pBot->enemy.ptr != nullptr)
		navByStrafe = true;

	bool botIsSniping = false;
	if (pBot->pEdict->v.playerclass == TFC_CLASS_SNIPER && pBot->current_weapon.iId == TF_WEAPON_SNIPERRIFLE && (pBot->f_snipe_time >= pBot->f_think_time || pBot->pEdict->v.button & IN_ATTACK)) {
		botIsSniping = true;
	}

	// this bit of code checks if the bot is getting stuck whilst navigating
	// or not.  it does so by making sure that the bot is making some kind
	// of progress towards it's waypoint
	if (!botIsSniping) // this code confuses sniping snipers
	{
		const float waypointDistance = (pBot->pEdict->v.origin - waypoints[pBot->current_wp].origin).Length();

		// if the bots waypoint has changed recently assume the bot isn't stuck
		if (pBot->current_wp != pBot->curr_wp_diff) {
			pBot->curr_wp_diff = pBot->current_wp;
			pBot->f_progressToWaypoint = waypointDistance + 0.1f;
		}

		// is the bot the nearest to the waypoint it's been so far?
		// (add 1.0 because we want to see sizeable, significant progress)
		if (waypointDistance + 1.0f < pBot->f_progressToWaypoint) {
			pBot->f_progressToWaypoint = waypointDistance;

			// no problem - so reset this
			pBot->f_navProblemStartTime = 0.0f;
		}
		else // uh-oh - looks liek troubble!
		{
			// remember when the poor bots troubles began(tell us about your mother)
			if (pBot->f_navProblemStartTime < 0.1f)
				pBot->f_navProblemStartTime = pBot->f_think_time;
		}
	}

	BotContactThink(pBot);

	// if the bot has run into some kind of movement problem try to
	// handle it here
	if (!botIsSniping && pBot->f_navProblemStartTime > 0.1f && pBot->f_navProblemStartTime + 0.5f < pBot->f_think_time) {
		// face the waypoint when navigation is getting hindered
		// and it's been going on for too long
		if (pBot->enemy.ptr == nullptr || pBot->f_navProblemStartTime + 4.0f < pBot->f_think_time)
			navByStrafe = false;

		// buoyed by water, or on a ladder?
		if ((pBot->pEdict->v.waterlevel > WL_FEET_IN_WATER && !(pBot->pEdict->v.flags & FL_ONGROUND)) || pBot->pEdict->v.movetype == MOVETYPE_FLY) {
			if (pBot->f_navProblemStartTime + 2.0f < pBot->f_think_time) {
				job_struct* newJob = InitialiseNewJob(pBot, JOB_GET_UNSTUCK);
				if (newJob != nullptr)
					SubmitNewJob(pBot, JOB_GET_UNSTUCK, newJob);
			}
		}
		else // not on a ladder or in some water
		{
			// if the bot is airborne, duck(useful if jumping onto something)
			if (!(pBot->pEdict->v.flags & FL_ONGROUND)) {
				// in case the bot forgets it is duck-jumping
				if (pBot->pEdict->v.velocity.z > 0.0f)
					pBot->f_duck_time = pBot->f_think_time + 0.3f;
			}
			else // not airborne - time to try and get around an obstruction
			{
				const int jumpResult = BotShouldJumpOver(pBot);

				// can the bot jump over something?
				if (jumpResult == 2) // 2 == jumpable
				{
					pBot->pEdict->v.button |= IN_JUMP;
				}
				else // can the bot duck under something?
				{
					const int duckResult = BotShouldDuckUnder(pBot);

					if (duckResult == 2) // 2 == duckable
					{
						pBot->f_duck_time = pBot->f_think_time + 0.3f;
					}
					// can't jump over, can't duck under either, but blocked by something
					else if (jumpResult == 1 // 1 = blocked by something
						|| duckResult == 1) {
						// try to get unstuck, but not too soon
						if (pBot->f_navProblemStartTime + 2.0f < pBot->f_think_time) {
							job_struct* newJob = InitialiseNewJob(pBot, JOB_GET_UNSTUCK);
							if (newJob != nullptr)
								SubmitNewJob(pBot, JOB_GET_UNSTUCK, newJob);
						}
						else // a little too soon for calling JOB_GET_UNSTUCK
						{
							// randomly switch direction to try and get unstuck
							if (pBot->f_periodicAlert3 < pBot->f_think_time && random_long(1, 1000) <= 501) {
								// jump too(it might help occasionally)
								pBot->pEdict->v.button |= IN_JUMP;

								if (pBot->side_direction == SIDE_DIRECTION_RIGHT)
									pBot->side_direction = SIDE_DIRECTION_LEFT;
								else
									pBot->side_direction = SIDE_DIRECTION_RIGHT;
							}

							// make sure the bot isn't stuck strafing into a wall
							if (BotCheckWallOnRight(pBot))
								pBot->side_direction = SIDE_DIRECTION_LEFT;
							else if (BotCheckWallOnLeft(pBot))
								pBot->side_direction = SIDE_DIRECTION_RIGHT;

							if (pBot->side_direction == SIDE_DIRECTION_RIGHT) {
								pBot->f_side_speed = pBot->f_max_speed;
								pBot->pEdict->v.button |= IN_MOVERIGHT; // so crates can be pushed
							}
							else {
								pBot->f_side_speed = -pBot->f_max_speed;
								pBot->pEdict->v.button |= IN_MOVELEFT; // so crates can be pushed
							}
						}
					}
					else // the bot doesn't appear to be blocked by anything it can see
					{
						// we don't know what's stalling the bot, but we can try a
						// few simple tricks(if the bots been stalled for 2 seconds or more)
						if (pBot->f_navProblemStartTime + 2.0f < pBot->f_think_time) {
							// if the bot is directly below it's current waypoint and not on a ladder
							// then assume the bot doesn't know it's fallen off and fix it
							if (pBot->pEdict->v.flags & FL_ONGROUND && pBot->pEdict->v.waterlevel != WL_HEAD_IN_WATER && !(waypoints[pBot->current_wp].flags & W_FL_LIFT) && pBot->pEdict->v.origin.z + 60.0f < waypoints[pBot->current_wp].origin.z &&
								(pBot->pEdict->v.origin - waypoints[pBot->current_wp].origin).Length2D() < 15.0f) {
								//	UTIL_HostSay(pBot->pEdict, 0, "fixed running vertically!");
								////DebugMessageOfDoom!
								BotFindCurrentWaypoint(pBot);
								return false; // to help avoid a repetitive failure
							}

							// slow down for a couple of seconds(see if that helps)
							if (pBot->enemy.ptr == nullptr && pBot->f_navProblemStartTime + 4.0f > pBot->f_think_time)
								pBot->f_move_speed = pBot->f_max_speed / 2.0f;

							// some maps(e.g. hunted) have undetectable obstacles
							// jumping and/or ducking can overcome some of those
							if (pBot->f_periodicAlert1 < pBot->f_think_time && random_long(1, 1000) <= 501) {
								if (random_long(1, 1000) <= 501)
									pBot->pEdict->v.button |= IN_JUMP;
								else
									pBot->f_duck_time = pBot->f_think_time + random_float(0.3f, 1.2f);
							}
						}
					}
				}
			}
		}
	}

	// keep navigating the waypoints, unless a serious problem occurred
	if (!BotHeadTowardWaypoint(pBot, navByStrafe))
		return false;

	// allow the bot to react according to the characteristics of it's current waypoint
	if (pBot->current_wp != -1) {
		// remember how far the bot is from it's current waypoint
		const float current_wp_distance = (waypoints[pBot->current_wp].origin - pBot->pEdict->v.origin).Length();

		if (navByStrafe == false) {
			// slow the bot down as it approaches the final waypoint on it's route
			if (pBot->current_wp == pBot->goto_wp) {
				if (current_wp_distance < 70.0f)
					pBot->f_move_speed = pBot->f_max_speed / 4;
				else if (current_wp_distance < 130.0f)
					pBot->f_move_speed = pBot->f_max_speed / 2;
			}

			// slow down if the next waypoint is a walk waypoint...
		 if (waypoints[pBot->current_wp].flags & W_FL_WALK)
				pBot->f_move_speed = pBot->f_max_speed / 3;

			// slow down when approaching a sharp corner to prevent overshooting - [APG]RoboCop[CL]
			if (pBot->current_wp != pBot->goto_wp && pBot->goto_wp != -1
				&& current_wp_distance < 100.0f && pBot->enemy.ptr == nullptr) {
				int nextWP;
				if (pBot->branch_waypoint == -1)
					nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);
				else
					nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->branch_waypoint, pBot->current_team);

				if (nextWP >= 0 && nextWP < num_waypoints) {
					// compute the turn angle between the current heading and the next segment
					Vector currentDir = waypoints[pBot->current_wp].origin - pBot->pEdict->v.origin;
					Vector nextDir = waypoints[nextWP].origin - waypoints[pBot->current_wp].origin;

					currentDir.z = 0;
					nextDir.z = 0;

					const float curLen = currentDir.Length();
					const float nxtLen = nextDir.Length();

					if (curLen > 1.0f && nxtLen > 1.0f) {
						currentDir = currentDir * (1.0f / curLen);
						nextDir = nextDir * (1.0f / nxtLen);

						const float dot = currentDir.x * nextDir.x + currentDir.y * nextDir.y;

						// dot < 0.5 means > ~60 degree turn, dot < 0 means > 90 degrees
						if (dot < 0.0f && current_wp_distance < 80.0f)
							pBot->f_move_speed = pBot->f_max_speed * 0.45f;
						else if (dot < 0.5f && current_wp_distance < 60.0f)
							pBot->f_move_speed = pBot->f_max_speed * 0.65f;
					}
				}
			}
		}

		// Detect ground drop-offs ahead to prevent falling off planks, cliffs, into lava etc. - [APG]RoboCop[CL]
		// Only when on ground, not on a ladder, and not already at a jump/lift waypoint
		if (pBot->pEdict->v.flags & FL_ONGROUND
			&& pBot->pEdict->v.waterlevel == WL_NOT_IN_WATER
			&& !(waypoints[pBot->current_wp].flags & (W_FL_LADDER | W_FL_JUMP | W_FL_LIFT | W_FL_TFC_JUMP))) {
			UTIL_MakeVectors(pBot->pEdict->v.v_angle);

			// trace forward and down from a point ahead of the bot
			const Vector aheadPoint = pBot->pEdict->v.origin + gpGlobals->v_forward * 40.0f;

			Vector downPoint = aheadPoint;
			downPoint.z -= 120.0f; // check for a significant drop
			TraceResult trGround;

			UTIL_TraceLine(aheadPoint, downPoint, ignore_monsters, pBot->pEdict, &trGround);

			if (trGround.flFraction >= 1.0f) {
				// no ground 120 units below ahead - likely a dangerous drop
				pBot->f_move_speed = pBot->f_max_speed / 4.0f;
			}
			// On walk waypoints (planks/narrow paths) also check sides for drop-offs
			// and use the visibility table to verify the next waypoint is reachable - [APG]RoboCop[CL]
			else if (waypoints[pBot->current_wp].flags & W_FL_WALK) {
				// check for drop-off to the left and right
				bool leftDrop = false;
				bool rightDrop = false;
				{
					Vector sideL = pBot->pEdict->v.origin + gpGlobals->v_right * -24.0f;
					sideL.z -= 80.0f;
					TraceResult trL;
					UTIL_TraceLine(pBot->pEdict->v.origin, sideL, ignore_monsters, pBot->pEdict, &trL);
					if (trL.flFraction >= 1.0f)
						leftDrop = true;

					Vector sideR = pBot->pEdict->v.origin + gpGlobals->v_right * 24.0f;
					sideR.z -= 80.0f;
					TraceResult trR;
					UTIL_TraceLine(pBot->pEdict->v.origin, sideR, ignore_monsters, pBot->pEdict, &trR);
					if (trR.flFraction >= 1.0f)
						rightDrop = true;
				}

				if (leftDrop || rightDrop) {
					// on a narrow path with a drop on at least one side
					pBot->f_move_speed = std::min(pBot->f_move_speed, pBot->f_max_speed * 0.4f);
					pBot->f_side_speed = 0.0f; // no strafing on narrow paths
				}

				// use visibility table: if we can't see the next route waypoint
				// from here, we may be drifting off the path
				if (pBot->goto_wp != -1) {
					const int nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);
					if (nextWP >= 0 && nextWP < num_waypoints
						&& !WaypointVisibleFromTo(pBot->current_wp, nextWP)) {
						// can't see the next waypoint - slow down further
						pBot->f_move_speed = std::min(pBot->f_move_speed, pBot->f_max_speed * 0.3f);
					}
				}
			}
		}

		// if the bot is approaching a lift
		if (waypoints[pBot->current_wp].flags & W_FL_LIFT) {
			BotUseLift(pBot);
		}

		// check if the bot is using a ladder
		if (waypoints[pBot->current_wp].flags & W_FL_LADDER || pBot->pEdict->v.movetype == MOVETYPE_FLY) {
			BotHandleLadderTraffic(pBot); // try to avoid ladder traffic jams

			// if not stopping on the ladder hold the forwards key
			if (pBot->f_pause_time < pBot->f_think_time || pBot->current_wp != pBot->goto_wp) {
				pBot->pEdict->v.button |= IN_FORWARD;
			}
		}

		// check if the next waypoint is a jump waypoint...
		if (waypoints[pBot->current_wp].flags & W_FL_JUMP) {
			if (pBot->pEdict->v.flags & FL_ONGROUND && pBot->f_pause_time < pBot->f_think_time) {
				const Vector jumpPoint = waypoints[pBot->current_wp].origin - (pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs);

				// pause briefly if the bot is not facing the jump waypoint enough
				if (BotInFieldOfView(pBot, jumpPoint) > 20)
					pBot->f_pause_time = pBot->f_think_time + 0.2f;
				else if (current_wp_distance < 100.0f) // otherwise jump
					pBot->pEdict->v.button |= IN_JUMP;
			}

			if (pBot->pEdict->v.velocity.z > 0.0f)
				pBot->f_duck_time = pBot->f_think_time + 0.25f; // for extra clearance
		}

		// see if the bot is about to get stuck along a blocked route
		// e.g. a detpack tunnel
		if (pBot->current_wp != pBot->goto_wp && (waypoints[pBot->current_wp].flags & W_FL_PATHCHECK || waypoints[pBot->current_wp].flags & W_FL_TFC_DETPACK_CLEAR || waypoints[pBot->current_wp].flags & W_FL_TFC_DETPACK_SEAL)) {
			// remember if the bot is going to a goal waypoint or a route branching waypoint
			int nextWP;
			if (pBot->branch_waypoint == -1)
				nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);
			else
				nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->branch_waypoint, pBot->current_team);

			if (nextWP > -1 && BotPathCheck(pBot->current_wp, nextWP) == false)
				BotChangeRoute(pBot);
		}
	}

	return true; // all is well so far
}

// This function would probably be a good place to check to see how close
// to the current waypoint the bot is, and if the bot is close enough to
// the desired waypoint then call BotFindWaypoint to find the next one.
// Set navByStrafe to true if you wish the bot to navigate by using axial
// movement speeds only(i.e. without having to look at the next waypoint).
bool BotHeadTowardWaypoint(bot_t* pBot, bool& r_navByStrafe) {
	// check if the bot is taking too long to reach it's current waypoint
	if (pBot->f_current_wp_deadline < pBot->f_think_time) {
		// tidy up the bots current waypoint, in case it's behind a wall
		pBot->current_wp = WaypointFindNearest_S(pBot->pEdict->v.origin, pBot->pEdict, REACHABLE_RANGE, pBot->current_team, lostBotIgnoreFlags);
		pBot->f_current_wp_deadline = pBot->f_think_time + BOT_WP_DEADLINE;

		++pBot->routeFailureTally; // chalk up another route failure
		return false;              // give up
	}

	BotFallenOffCheck(pBot);

	// if the bot has a destination waypoint and a current waypoint
	if (pBot->current_wp != -1 && pBot->goto_wp != -1) {
		// turn r_navByStrafe off if the bot is using a ladder unless
		// it has seen an enemy recently and isn't getting seriously stuck
		if (r_navByStrafe == true && (waypoints[pBot->current_wp].flags & W_FL_LADDER || pBot->pEdict->v.movetype == MOVETYPE_FLY)) {
			if (pBot->enemy.ptr == nullptr)
				r_navByStrafe = false;
			else if (pBot->f_navProblemStartTime > 0.1f && pBot->f_navProblemStartTime + 4.0f < pBot->f_think_time)
				r_navByStrafe = true; // Should be true? [APG]RoboCop[CL]
		}

		// if the bot is not navigating by strafing or is approaching
		// a jump waypoint then face towards the current waypoint
		if (r_navByStrafe == false || waypoints[pBot->current_wp].flags & W_FL_JUMP) {
			const Vector v_direction = waypoints[pBot->current_wp].origin - pBot->pEdict->v.origin;
			const Vector bot_angles = UTIL_VecToAngles(v_direction);

			pBot->idle_angle = bot_angles.y;

			// allow bots to approach non-goal waypoints imprecisely
			if (pBot->current_wp != pBot->goto_wp)
				pBot->idle_angle += pBot->f_waypoint_drift;

			pBot->pEdict->v.ideal_yaw = pBot->idle_angle;
			pBot->pEdict->v.idealpitch = bot_angles.x;
		}
		else // navByStrafe is active
		{
			// navigate towards the current waypoint using axial movement speeds only
			// to do this we need to know the angle of the bots current waypoint
			// from the bots view angle

			// get the angle towards the bots current waypoint
			const Vector offset = waypoints[pBot->current_wp].origin - pBot->pEdict->v.origin;
			Vector vang = UTIL_VecToAngles(offset);
			vang.y -= pBot->pEdict->v.v_angle.y;
			vang.y = 360.0f - vang.y;

			// wrap Y if need be
			if (vang.y < 0.0f)
				vang.y += 360.0f;
			else if (vang.y > 360.0f)
				vang.y -= 360.0f;

			/*	// debug stuff
							char msg[96];
							std::sprintf(msg, "vang.y %f, v_angle %f",
											vang.y, pBot->pEdict->v.v_angle.y);
							UTIL_HostSay(pBot->pEdict, 0, msg); //DebugMessageOfDoom!*/

							// is the waypoint ahead?
			if (vang.y > 275.0f || vang.y < 85.0f) {
				// do nothing, leave the bots forward speed as it is
			}
			// if the waypoint is behind, go backwards
			else if (vang.y > 95.0f && vang.y < 265.0f)
				pBot->f_move_speed = -pBot->f_move_speed;
			else
				pBot->f_move_speed = 0.0f; // waypoint is not ahead or behind

			// if the waypoint is on the left, sidestep left
			if (vang.y > 185.0f && vang.y < 355.0f) {
				pBot->side_direction = SIDE_DIRECTION_LEFT;
				pBot->f_side_speed = -pBot->f_max_speed;
			}
			// if the waypoint is on the right, sidestep right
			else if (vang.y > 5.0f && vang.y < 175.0f) {
				pBot->side_direction = SIDE_DIRECTION_RIGHT;
				pBot->f_side_speed = pBot->f_max_speed;
			}
			else
				pBot->f_side_speed = 0.0f; // not on left or right, don't strafe sideways

			// now to handle vertical movement when swimming(or bobbing on the surface of water)
			if (pBot->pEdict->v.waterlevel == WL_HEAD_IN_WATER || (pBot->pEdict->v.waterlevel == WL_WAIST_IN_WATER // on the surface
				&& !(pBot->pEdict->v.flags & FL_ONGROUND))) {
				// swim up if below the waypoint
				if (pBot->pEdict->v.origin.z < waypoints[pBot->current_wp].origin.z - 5.0f) {
					//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs,
					//		pBot->pEdict->v.origin + Vector(0, 0, 100.0),
					//		10, 2, 250, 250, 50, 200, 10);

					pBot->f_vertical_speed = pBot->f_max_speed;
				}

				// swim down if above the waypoint
				else if (pBot->pEdict->v.origin.z > waypoints[pBot->current_wp].origin.z + 5.0f) {
					//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs,
					//		pBot->pEdict->v.origin + Vector(0, 0, 100.0),
					//		10, 2, 250, 250, 250, 200, 10);

					pBot->f_vertical_speed = -pBot->f_max_speed;
				}
			}
		}
	}

	if (BotUpdateRoute(pBot))
		return true;
	return false;
}

// BotUpdateRoute()
// Selects the next waypoint along the bot's route.
static bool BotUpdateRoute(bot_t* pBot) {
	int new_current_wp; // what pBot->current_wp might be set to
	const edict_t* pEdict = pBot->pEdict;

	// If the bot doesn't have a current waypoint, then lets
	// try sending the bot to the closest waypoint.
	if (pBot->current_wp < 0) {
		// UTIL_HostSay(pBot->pEdict, 0, "BotFindWaypoint, current_wp == -1"); //DebugMessageOfDoom!

		// find the nearest visible waypoint
		new_current_wp = WaypointFindNearest_S(pBot->pEdict->v.origin, pEdict, REACHABLE_RANGE, pBot->current_team, lostBotIgnoreFlags);

		if (new_current_wp != -1) {
			pBot->current_wp = new_current_wp;
			pBot->f_current_wp_deadline = pBot->f_think_time + BOT_WP_DEADLINE;

			return true;
		}
		return false;
		// couldn't find a current waypoint for the bot
	}
	// the bot already has a current waypoint
	new_current_wp = pBot->current_wp;

	// if the bot has a new goal waypoint, dump/reset the current branching waypoint
	if (pBot->goto_wp != pBot->lastgoto_wp)
		pBot->branch_waypoint = -1;

	// if the bot took a branching route and has arrived at the branching waypoint
	// then continue onwards to the goal waypoint
	if (pBot->current_wp == pBot->branch_waypoint) {
		//	UTIL_HostSay(pBot->pEdict, 0, "resuming from sideroute"); //DebugMessageOfDoom!
		pBot->branch_waypoint = -1;
	}

	pBot->lastgoto_wp = pBot->goto_wp; // allows us to monitor for changed goal waypoints

	const float dist = (waypoints[new_current_wp].origin - pBot->pEdict->v.origin).Length();

	// try to find the next waypoint on the route to the bots goal
	int nextWP;
	if (pBot->branch_waypoint == -1)
		nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);
	else // bots current goal is a branching waypoint
		nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->branch_waypoint, pBot->current_team);

	// figure out how near to the bot's current waypoint the bot has to be
	// before it will move on the next waypoint
	float needed_distance = 50.0f; // standard distance for most waypoint types
	bool heightCheck = true;       // used only when climbing ladders
	if (pBot->pEdict->v.movetype == MOVETYPE_FLY) {
		// if the bot is on a ladder make sure it is just above the waypoint
		needed_distance = 20.0f; // got to be near when on a ladder
		if (pBot->pEdict->v.origin.z < waypoints[new_current_wp].origin.z || pBot->pEdict->v.origin.z > waypoints[new_current_wp].origin.z + 10.0f)
			heightCheck = false;
	}
	else if (waypoints[new_current_wp].flags & W_FL_JUMP) {
		// gotta be similar height or higher than jump waypoint
		if (pBot->pEdict->v.origin.z < waypoints[new_current_wp].origin.z - 15.0f || pBot->pEdict->v.flags & FL_ONGROUND)
			heightCheck = false;
		needed_distance = 80.0f;
	}
	else if (waypoints[new_current_wp].flags & W_FL_LIFT)
		needed_distance = 25.0f; // some lifts are small(e.g. rock2's lifts)
	else if (waypoints[new_current_wp].flags & W_FL_WALK)
		needed_distance = 20.0f;

	bool waypointTouched = false;

	// if the bot's near enough to it's current waypoint, and it hasn't
	// reached it's destination then pick the next waypoint on the route
	if (new_current_wp != pBot->goto_wp && dist < needed_distance && heightCheck == true) {
		waypointTouched = true;
	}
	// this check can solve waypoint circling problems
	else if (dist < 100.0f && pBot->f_navProblemStartTime > 0.1f && pBot->f_navProblemStartTime + 0.5f < pBot->f_think_time) {
		if (nextWP != -1 && nextWP != pBot->goto_wp) {
         const float pathDistance = static_cast<float>(WaypointDistanceFromTo(new_current_wp, nextWP, pBot->current_team));
			const float distToNext = (waypoints[nextWP].origin - pBot->pEdict->v.origin).Length();

			// see if the bot is near enough to the next waypoint despite
			// not touching the current waypoint
			if (distToNext < pathDistance && dist + distToNext < pathDistance + 50.0f) {
				//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
				//		pBot->pEdict->v.origin + Vector(0, 0, 100.0),
				//		10, 2, 250, 250, 250, 200, 10);

				waypointTouched = true;
			}
		}
	}

	if (waypointTouched) {
		if (nextWP != -1 && nextWP < num_waypoints) {
			new_current_wp = nextWP;
			pBot->routeFailureTally = 0; // all is well, reset this
		}
		else // bot has no route to it's goal
		{
			++pBot->routeFailureTally; // chalk up another route failure
			new_current_wp = pBot->current_wp;
		}

		// set the amount of time to get to the new current waypoint
		if (new_current_wp != pBot->current_wp)
			pBot->f_current_wp_deadline = pBot->f_think_time + BOT_WP_DEADLINE;

		pBot->current_wp = new_current_wp;

		// lemming check! try to stop the bot running off a cliff
		/*	if(nextWP != -1
											  && nextWP != pBot->goto_wp
											  && static_cast<int>(pBot->pEdict->v.health) < 91
											  && !(waypoints[nextWP].flags & W_FL_LADDER)
											  && (waypoints[nextWP].origin.z + 300.0) < pBot->pEdict->v.origin.z)
											  {
															  char msg[80];
															  std::sprintf(msg, "<Avoiding drop of height: %f>",
																			  pBot->pEdict->v.origin.z - waypoints[nextWP].origin.z);
															  UTIL_HostSay(pBot->pEdict, 0, msg);//DebugMessageOfDoom!
															  BotChangeRoute(pBot);
											  }*/

											  // now that the bot has picked the next waypoint on the route
											  // to its goal, consider trying an alternate route
		BotFindSideRoute(pBot);
	}

	return true;
}

// This is a fairly simple function.
// If the bot is on a ladder going down, jump off if someone is on
// the ladder coming up.
static void BotHandleLadderTraffic(bot_t* pBot) {
	// only handle bots that are on ladders heading downwards
	if (pBot->current_wp == -1 || pBot->pEdict->v.movetype != MOVETYPE_FLY || waypoints[pBot->current_wp].origin.z > pBot->pEdict->v.origin.z)
		return;

	// trace a line straight down
	TraceResult tr;
	UTIL_TraceLine(pBot->pEdict->v.origin, pBot->pEdict->v.origin - Vector(0.0f, 0.0f, 120.0f), dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

	// see if we detected a player below
	if (tr.flFraction < 1.0f && tr.pHit != nullptr) {
		// search the world for players...
		for (int i = 1; i <= gpGlobals->maxClients; i++) {
			const edict_t* pPlayer = INDEXENT(i);

			// skip invalid players
			if (pPlayer && !pPlayer->free && pPlayer == tr.pHit) {
				// jump off the ladder
				pBot->pEdict->v.button = 0; // in case IN_FORWARD is active
				pBot->pEdict->v.button |= IN_JUMP;
				pBot->f_pause_time = pBot->f_think_time + 1.2f; // so the jump will work
				//	UTIL_HostSay(pBot->pEdict, 0, "ladder jam"); //DebugMessageOfDoom!
				break;
			}
		}
	}
}

// An all in one function for handling bot behaviour as they try to use lifts.
void BotUseLift(bot_t* pBot) {
	if (pBot->current_wp == pBot->goto_wp)
		return; // shouldn't happen, but just in case

	// remember if the bot is going to a goal waypoint or a route branching waypoint
	int goalWP = pBot->goto_wp;
	if (pBot->branch_waypoint != -1)
		goalWP = pBot->branch_waypoint;

	const int nextWP = WaypointRouteFromTo(pBot->current_wp, goalWP, pBot->current_team);
	if (nextWP == -1)
		return; // shouldn't happen, but just in case

	const float distanceWP2D = (waypoints[pBot->current_wp].origin - pBot->pEdict->v.origin).Length2D();

	// see if the bot has arrived, a simple way of checking is to see if the next
	// waypoint on the route is not a lift waypoint
	if (!(waypoints[nextWP].flags & W_FL_LIFT)) {
		/*	// close enough to the final lift waypoint?
						if(waypoints[pBot->current_wp].origin.z < pBot->pEdict->v.origin.z
										&& waypoints[pBot->current_wp].origin.z > (pBot->pEdict->v.origin.z - 36.0))
										return;*/

										// stop and wait when in line with the lift waypoint
		if (distanceWP2D < 25.0f)
			pBot->f_pause_time = pBot->f_think_time + 0.2f;
		return;
	}
	// current waypoint is a lift waypoint, as is the next waypoint on the route
	// is the lift waypoint roughly the same altitude as the bot?
	if (waypoints[pBot->current_wp].origin.z < pBot->pEdict->v.origin.z + 36.0f && waypoints[pBot->current_wp].origin.z > pBot->pEdict->v.origin.z - 36.0f) {
		bool liftReady = false;

		// traceline a short distance up from the waypoint to make sure
		// the lift isn't there
		TraceResult tr;
		UTIL_TraceLine(waypoints[pBot->current_wp].origin, waypoints[pBot->current_wp].origin + Vector(0.0f, 0.0f, 36.0), dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

		if (tr.pHit != nullptr) {
			char className[10];
			std::strncpy(className, STRING(tr.pHit->v.classname), 10);
			className[9] = '\0';

			//	UTIL_HostSay(pBot->pEdict, 0, className); //DebugMessageOfDoom!

			if (std::strncmp(STRING(tr.pHit->v.classname), "func_door", 9) != 0 && std::strncmp(STRING(tr.pHit->v.classname), "func_plat", 9) != 0) {
				// the space at the lift waypoint appears to be empty
				// is the lift unoccupied by bot teammates?
				if (BotTeammatesNearWaypoint(pBot, pBot->current_wp) < 1) {
					// do a traceline straight down, to see if the lift is there
					UTIL_TraceLine(waypoints[pBot->current_wp].origin, waypoints[pBot->current_wp].origin - Vector(0.0f, 0.0f, 50.0f), ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

					if (tr.pHit != nullptr) {
						std::strncpy(className, STRING(tr.pHit->v.classname), 10);
						className[9] = '\0';
						if (std::strncmp(STRING(tr.pHit->v.classname), "func_door", 9) == 0 || std::strncmp(STRING(tr.pHit->v.classname), "func_plat", 9) == 0) {
							//	WaypointDrawBeam(INDEXENT(1), tr.pHit->v.absmin,
							//		VecBModelOrigin(tr.pHit), 10, 2, 50, 50, 250, 200, 10);

							//	WaypointDrawBeam(INDEXENT(1), tr.pHit->v.absmin,
							//		tr.pHit->v.absmin + tr.pHit->v.size, 10, 2, 50, 250, 50, 200, 10);

							liftReady = true;
						}
					}
				}
			}
		}

		if (liftReady) {
			// walk into the lift
			pBot->f_move_speed = pBot->f_max_speed / 2;
			//	UTIL_HostSay(pBot->pEdict, 0, "approaching lift"); //DebugMessageOfDoom!
		}
		else {
			//	UTIL_HostSay(pBot->pEdict, 0, "awaiting lift's return"); //DebugMessageOfDoom!

			if (distanceWP2D < 300.0f)
				pBot->f_move_speed = -(pBot->f_max_speed / 3);
			else
				pBot->f_pause_time = pBot->f_think_time + 0.2f;
		}
	}
	else // lift waypoint is too far above or below the bot to walk into
	{
		// do a traceline straight down, to see if the bot is on a lift
		TraceResult tr;
		UTIL_TraceLine(pBot->pEdict->v.origin, pBot->pEdict->v.origin - Vector(0.0f, 0.0f, 50.0f), ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

		if (tr.pHit != nullptr) {
			char className[10];
			std::strncpy(className, STRING(tr.pHit->v.classname), 10);
			className[9] = '\0';
			if (std::strncmp(STRING(tr.pHit->v.classname), "func_door", 9) == 0 || std::strncmp(STRING(tr.pHit->v.classname), "func_plat", 9) == 0) {
				pBot->current_wp = nextWP;
			}
			// bot is not on a lift, danger Will Robinson!
			//	else UTIL_HostSay(pBot->pEdict, 0, className); //DebugMessageOfDoom!
		}
	}
}

// This function returns 1 if the bot has detected an obstacle at ankle height.
// 2 if that obstacle can be jumped over.  0 if no such obstacles were found.
static int BotShouldJumpOver(const bot_t* pBot) {
	// bots have a standing height of 72 units
	// and their origin is 37 units above the bottom of their boots
	// when crouching bots are 36 units tall and their origin is 19 units high

	bool obstacleFound = false;

	// make vectors based upon the bots view yaw angle only
	UTIL_MakeVectors(Vector(0.0f, pBot->pEdict->v.v_angle.y, 0.0f));

	TraceResult tr;
	const Vector botBottom = Vector(pBot->pEdict->v.origin.x, pBot->pEdict->v.origin.y, pBot->pEdict->v.absmin.z) + gpGlobals->v_forward * 4.0f; // to the front of the bot slightly

	// set how far apart the left and right scans will be,
	// decide randomly so that we increase the bots chances of detecting
	// a jumpable obstacle
	const float aperture = 5.0f * static_cast<float>(random_long(1, 3));

	Vector v_source;

	// whether or not to trace down from the bots origin or up from the bots ankles
	// random so as to maximise chance of detecting obstacles
	bool searchDownwards = true;
	if (random_long(1, 1000) > 500)
		searchDownwards = false; // search upwards instead

	// here we can check from the left leg of the bot, first to see if there's
	// an obstacle there, then to see if it can be jumped over
	{
		// trace a short line forward and left at the lowest height
		// of something that needs jumping
		if (searchDownwards)
			v_source = botBottom + Vector(0.0f, 0.0f, 45.0f); // waist downwards
		else
			v_source = botBottom + Vector(0.0f, 0.0f, 15.0f); // ankles upwards

		Vector v_dest = botBottom + Vector(0.0f, 0.0f, 17.0f) + gpGlobals->v_forward * 24.0f; // forwards
		v_dest = v_dest + gpGlobals->v_right * -aperture;                             // left a bit
		UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

		// obstructed by something?
		if (tr.flFraction < 1.0f) {
			// show where the traceline hit
			//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 250, 250, 250, 200, 10);

			// get the distance of the obstacle from the bots lower leg
			const float shinObstacleDistance = (v_source - tr.vecEndPos).Length2D();

			// trace a short line forward and left at maximum jump/mantling height
			// also take into account whether or not the bot is crouching
			if (pBot->pEdict->v.button & IN_DUCK)
				v_source = botBottom + Vector(0.0f, 0.0f, 37.0f);
			else
				v_source = botBottom + Vector(0.0f, 0.0f, 49.9f);
			v_dest = v_source + gpGlobals->v_forward * 24.0f;  // forwards a bit
			v_dest = v_dest + gpGlobals->v_right * -aperture; // left a bit
			UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

			// show where the traceline goes
			//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 250, 250, 250, 200, 10);

			// if there is line of sight report that the bot can try jumping here
			if (tr.flFraction >= 1.0f)
				return 2;
			// did the traceline go further then it did when traced from lower down the body?
			// if so then there appears to be some kind of ledge here
			if ((v_source - tr.vecEndPos).Length2D() > shinObstacleDistance + 1.0f)
				return 2;
			obstacleFound = true;
		}
	}

	// checking the left side didn't find a jumpable object
	// so we can check from the right leg of the bot, first to see if there's
	// an obstacle there, then to see if it can be jumped over
	{
		// trace a short line forward and right at the lowest height
		// of something that needs jumping
		if (searchDownwards)
			v_source = botBottom + Vector(0, 0, 45.0f); // waist downwards
		else
			v_source = botBottom + Vector(0, 0, 15.0f); // ankles upwards

		Vector v_dest = botBottom + Vector(0, 0, 17.0f) + gpGlobals->v_forward * 24.0f; // forwards
		v_dest = v_dest + gpGlobals->v_right * aperture;                              // right a bit
		UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

		// obstructed by something?
		if (tr.flFraction < 1.0f) {
			// show where the traceline hit
			//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 250, 250, 250, 200, 10);

			// get the distance of the obstacle from the bots lower leg
			const float shinObstacleDistance = (v_source - tr.vecEndPos).Length2D();

			// trace a short line forward and right at maximum jump/mantling height
			// also take into account whether or not the bot is crouching
			if (pBot->pEdict->v.button & IN_DUCK)
				v_source = botBottom + Vector(0.0f, 0.0f, 37.0f);
			else
				v_source = botBottom + Vector(0.0f, 0.0f, 49.9f);
			v_dest = v_source + gpGlobals->v_forward * 24.0f; // forwards a bit
			v_dest = v_dest + gpGlobals->v_right * aperture; // right a bit
			UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

			// show where the traceline goes
			//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 250, 250, 250, 200, 10);

			// if there is line of sight report that the bot can try jumping here
			if (tr.flFraction >= 1.0f)
				return 2;
			// did the traceline go further then it did when traced from lower down the body?
			// if so then there appears to be some kind of ledge here
			if ((v_source - tr.vecEndPos).Length2D() > shinObstacleDistance + 1.0f)
				return 2;
			obstacleFound = true;
		}
	}

	if (obstacleFound)
		return 1;
	return 0;
	// all clear!
}

// This function returns 1 if the bot has detected an obstacle at head height.
// 2 if that obstacle can be ducked under.  0 if no such obstacles were found.
static int BotShouldDuckUnder(const bot_t* pBot) {
	// doh!
	if (pBot->pEdict->v.button & IN_DUCK)
		return 2;

	bool obstacleFound = false;

	// make vectors based upon the bots view yaw angle only
	UTIL_MakeVectors(Vector(0.0, pBot->pEdict->v.v_angle.y, 0.0f));

	const Vector botBottom = Vector(pBot->pEdict->v.origin.x, pBot->pEdict->v.origin.y, pBot->pEdict->v.absmin.z) + gpGlobals->v_forward * 4.0; // to the front of the bot slightly

	TraceResult tr;

	// here we can check from the left side of the bot forwards, first to
	// see if there's an obstacle there, then to see if it can be ducked under
	{
		// trace a short line forward and left at the height of the bot's head
		// to see if there's something that needs ducking
		Vector v_source = pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs;
		Vector v_dest = v_source + gpGlobals->v_forward * 24.0f; // forwards a bit
		v_dest = v_dest + gpGlobals->v_right * -10.0f;           // left a bit
		UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

		// show where the traceline goes
		//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 50, 50, 250, 200, 10);

		// obstructed by something?
		if (tr.flFraction < 1.0f) {
			// get the distance of the obstacle from the bots head
			const float headObstacleDistance = (v_source - tr.vecEndPos).Length();

			// trace a short line forward and right just above ducking height
			v_source = botBottom + Vector(0.0f, 0.0f, 37.0f);
			v_dest = v_source + gpGlobals->v_forward * 24.0f; // forwards a bit
			v_dest = v_dest + gpGlobals->v_right * -10.0f;    // left a bit
			UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

			// show where the traceline goes
			//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 50, 50, 250, 200, 10);

			// if there is line of sight report that the bot can try ducking here
			if (tr.flFraction >= 1.0f)
				return 2;
			// did the traceline go further then it did when traced from the head?
			// if so then ducking may help
			if ((v_source - tr.vecEndPos).Length() > headObstacleDistance + 1.0f)
				return 2;
			obstacleFound = true;
		}
	}

	// checking the left side didn't find a duckable object
	// so we can check from the right side of the bot forwards, first to
	// see if there's an obstacle there, then to see if it can be ducked under
	{
		// trace a short line forward and right at the height of the bot's head
		// to see if there's something that needs ducking
		Vector v_source = pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs;
		Vector v_dest = v_source + gpGlobals->v_forward * 24.0f; // forwards a bit
		v_dest = v_dest + gpGlobals->v_right * 10.0f;            // right a bit
		UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

		// show where the traceline goes
		//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 50, 50, 250, 200, 10);

		// obstructed by something?
		if (tr.flFraction < 1.0f) {
			// get the distance of the obstacle from the bots head
			const float headObstacleDistance = (v_source - tr.vecEndPos).Length();

			// trace a short line forward and right just above ducking height
			v_source = botBottom + Vector(0.0f, 0.0f, 37.0f);
			v_dest = v_source + gpGlobals->v_forward * 24.0f; // forwards a bit
			v_dest = v_dest + gpGlobals->v_right * 10.0f;     // right a bit
			UTIL_TraceLine(v_source, v_dest, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

			// show where the traceline goes
			//	WaypointDrawBeam(INDEXENT(1), v_source, v_dest, 10, 2, 50, 50, 250, 200, 10);

			// if there is line of sight report that the bot can try ducking here
			if (tr.flFraction >= 1.0f)
				return 2;
			// did the traceline go further then it did when traced from the head?
			// if so then ducking may help
			if ((v_source - tr.vecEndPos).Length() > headObstacleDistance + 1.0f)
				return 2;
			obstacleFound = true;
		}
	}

	if (obstacleFound)
		return 1;
	return 0;
	// all clear!
}

// This function attempts to detect whether or not the bot has fallen off
// some kind of ledge.  It returns true if the bot appears to have
// fallen off, and will also attempt to correct the bots current waypoint.
static bool BotFallenOffCheck(bot_t* const pBot) {
	if (pBot->current_wp == -1)
		return false;

	// fix going to wrong waypoint if falling, could help with rocket jumping :D
	// 87.0 = bot's standing origin(37) plus maximum jump height(48 - 50)
	if (pBot->pEdict->v.velocity.z < -200.0f && pBot->pEdict->v.waterlevel != WL_HEAD_IN_WATER && !(waypoints[pBot->current_wp].flags & W_FL_LADDER) && waypoints[pBot->current_wp].origin.z > pBot->pEdict->v.absmin.z + 87.0f) {
		// waypoints with an origin higher than this should be considered unreachable
		const float heightThreshold = waypoints[pBot->current_wp].origin.z - 10.0f;

		// look for a waypoint that is connected directly to the bots
		// current waypoint and that is reachable
		// if none are found the bot must have fallen off a ledge
		for (int index = 0; index < num_waypoints; index++) {
			// skip deleted waypoints
			if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING)
				continue;

			// skip this waypoint if it's team specific and teams don't match
			if (waypoints[index].flags & W_FL_TEAM_SPECIFIC && (waypoints[index].flags & W_FL_TEAM) != pBot->current_team)
				continue;

			// skip the current waypoint and any that are above the bot
			if (index == pBot->current_wp || index == pBot->goto_wp || waypoints[index].origin.z > heightThreshold)
				continue;

			// does this waypoint have a direct path to the bots current waypoint?
			const PATH* p = paths[index];
			bool waypointIsConnected = false;
			while (p != nullptr && !waypointIsConnected) {
				for (const short i : p->index) {
					if (i == pBot->current_wp) {
						waypointIsConnected = true;
						break;
					}
				}

				p = p->next; // go to next node in linked list
			}

			// if this waypoint is nearer to the bot then the current waypoint is
			// and visible to the bot we shall assume the bot can reach it first
			if (waypointIsConnected) {
				//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
				//		waypoints[index].origin, 10, 2, 250, 250, 250, 200, 10);

				const float distanceToCurr = (pBot->pEdict->v.origin - waypoints[pBot->current_wp].origin).Length();

				if (VectorsNearerThan(pBot->pEdict->v.origin, waypoints[index].origin, distanceToCurr) && BotCanSeeOrigin(pBot, waypoints[index].origin))
					return false;
			}
		}
	}
	else
		return false;

	const int nextWP = WaypointRouteFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);

	// set current waypoint to next waypoint if next waypoint is lower
	// this can help the president on hunted when he falls from spawn
	if (nextWP != -1 && nextWP != pBot->current_wp && waypoints[nextWP].origin.z < pBot->pEdict->v.origin.z) {
		pBot->current_wp = nextWP;
	}
	else {
		BotFindCurrentWaypoint(pBot);
	}

	//	UTIL_HostSay(pBot->pEdict, 0, "I fell off"); //DebugMessageOfDoom
	return true;
}

// This function traces a line several units out to the bots left.
// It returns true if an obstacle was encountered, false otherwise.
bool BotCheckWallOnLeft(const bot_t* pBot) {
	UTIL_MakeVectors(pBot->pEdict->v.v_angle);

	// do a trace 40 units to the left
	Vector v_left = pBot->pEdict->v.origin + gpGlobals->v_right * -40;

	// lower v_left to height of a low wall
	v_left.z = pBot->pEdict->v.absmin.z + 17.0f;

	TraceResult tr;
	UTIL_TraceLine(pBot->pEdict->v.origin, v_left, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

	// check if the trace hit something...
	if (tr.flFraction < 1.0f) {
		//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
		//		v_left, 10, 2, 250, 50, 50, 200, 10);

		return true;
	}

	return false;
}

// This function traces a line several units out to the bots right.
// It returns true if an obstacle was encountered, false otherwise.
bool BotCheckWallOnRight(const bot_t* pBot) {
	UTIL_MakeVectors(pBot->pEdict->v.v_angle);

	// do a trace 40 units to the right
	Vector v_right = pBot->pEdict->v.origin + gpGlobals->v_right * 40.0f;

	// lower v_right to height of a low wall
	v_right.z = pBot->pEdict->v.absmin.z + 17.0f;

	TraceResult tr;
	UTIL_TraceLine(pBot->pEdict->v.origin, v_right, dont_ignore_monsters, pBot->pEdict->v.pContainingEntity, &tr);

	// check if the trace hit something...
	if (tr.flFraction < 1.0f) {
		//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
		//		v_right, 10, 2, 250, 50, 50, 200, 10);

		return true;
	}

	return false;
}

// This function returns the index of a waypoint suitable for building a
// dispenser at, or -1 on failure.
int BotGetDispenserBuildWaypoint(const bot_t* pBot) {
	// if the bot has a sentry build the dispenser near it
	if (pBot->has_sentry == true && !FNullEnt(pBot->sentry_edict)) {
		return WaypointFindRandomGoal_R(pBot->sentry_edict->v.origin, false, 800.0f, -1, 0);
	}

	// build near a random sentry waypoint
	if (pBot->current_wp < 0)
		return -1;

	const int sentryWP = WaypointFindRandomGoal(pBot->current_wp, pBot->current_team, W_FL_TFC_SENTRY);

	if (sentryWP == -1)
		return -1;

	return WaypointFindRandomGoal_R(waypoints[sentryWP].origin, false, 800.0f, -1, 0);
}

// This function returns the index of a waypoint suitable for building a
// Teleporter at, or -1 on failure.
int BotGetTeleporterBuildWaypoint(const bot_t* pBot, const bool buildEntrance) {
	WPT_INT32 neededFlags;
	int otherEndWP = -1; // remembers the waypoint for the other built teleport

	int indices[10];
	int count = 0;

	if (buildEntrance) {
		neededFlags = W_FL_TFC_TELEPORTER_ENTRANCE;
		if (!FNullEnt(pBot->tpExit) && pBot->tpExitWP > -1)
			otherEndWP = pBot->tpExitWP;
	}
	else {
		neededFlags = W_FL_TFC_TELEPORTER_EXIT;
		if (!FNullEnt(pBot->tpEntrance) && pBot->tpEntranceWP > -1)
			otherEndWP = pBot->tpEntranceWP;
	}

	// start the search
	for (int index = 0; index < num_waypoints; index++) {
		// skip any deleted or aiming waypoints
		if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING)
			continue;

		// skip irrelevant waypoints
		if (!(waypoints[index].flags & neededFlags))
			continue;

		// skip this waypoint if it's unavailable or unreachable
		if (!WaypointAvailable(index, pBot->current_team) || WaypointRouteFromTo(pBot->current_wp, index, pBot->current_team) == -1)
			continue;

		// if the other teleporter has already been built
		// make sure this teleporter isn't too near to it
		if (otherEndWP != -1) {
			int connectedDistance = WaypointDistanceFromTo(index, otherEndWP, pBot->current_team);
			if (connectedDistance > -1 && connectedDistance < 1400)
				continue;

			// check in both directions in case route is one way only
			connectedDistance = WaypointDistanceFromTo(otherEndWP, index, pBot->current_team);
			if (connectedDistance > -1 && connectedDistance < 1400)
				continue;
		}

		// found one
		indices[count] = index;
		++count;

		if (count >= 10)
			break; // we have filled the list
	}

	if (count > 0)
		return indices[random_long(0, count - 1)];
	return -1;
}

// This function allows bots to pick a new goal waypoint that will lead
// them along a branching route from their current route.
void BotFindSideRoute(bot_t* pBot) {
	// don't allow branching if the bot is already branching,
	// because the bot will take longer and longer to arrive
	if (pBot->branch_waypoint != -1)
		return;

	if (pBot->current_wp == -1 || pBot->goto_wp == -1)
		return;

	// 50/50 chance of not branching at all
	if (random_long(1, 1000) > 500)
		return;

	// bit field of waypoint types to ignore
	static constexpr WPT_INT32 ignoreFlags = 0 + (W_FL_DELETED | W_FL_AIMING | W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_SNIPER | W_FL_TFC_DETPACK_CLEAR | W_FL_TFC_DETPACK_SEAL | W_FL_TFC_TELEPORTER_ENTRANCE |
																 W_FL_TFC_TELEPORTER_EXIT | W_FL_HEALTH | W_FL_ARMOR | W_FL_AMMO | W_FL_TFC_JUMP);

	// find out if the bot is at a junction waypoint by counting
	// the number of paths connected from it
	const PATH* p = paths[pBot->current_wp];
	int i;
	int paths_total = 0; // number of paths from the bots current waypoint
	while (p != nullptr && paths_total < 3) {
		for (i = 0; i < MAX_PATH_INDEX && paths_total < 3; i++) {
			// count the path node if it's available to the bots team
			if (p->index[i] != -1 && !(waypoints[p->index[i]].flags & ignoreFlags) && (!(waypoints[p->index[i]].flags & W_FL_TEAM_SPECIFIC) || (waypoints[p->index[i]].flags & W_FL_TEAM) == pBot->current_team))
				paths_total++;
		}

		p = p->next; // go to next node in linked list
	}

	// don't branch unless at a junction waypoint
	if (paths_total < 3)
		return;

	// remember the next waypoint on the bots route to it's current goal
	const int nextPredictedWP = WaypointRouteFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);
	if (nextPredictedWP == -1)
		return;

	// remember how far the bot is from it's goal
	const int currentGoalDistance = WaypointDistanceFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team);
	if (currentGoalDistance < 400)
		return;

	// has the bot changed it's mind on how far it's willing to branch?
	if (pBot->f_side_route_time < pBot->f_think_time) {
		pBot->f_side_route_time = pBot->f_think_time + random_float(15.0f, 60.0f);

		const int randomatic = random_long(1, 1000);
		if (randomatic < 401)
			pBot->sideRouteTolerance = 400; // very short route changes
		else if (randomatic < 701)
			pBot->sideRouteTolerance = 2400; // mid-length route changes
		else
			pBot->sideRouteTolerance = 8000; // map covering distances
	}

	// start the search(from a randomly selected waypoint)
	i = static_cast<int>(random_long(0, num_waypoints - 1));
	for (int index = 0; index < num_waypoints; index++, i++) {
		// wrap the search if the number of waypoints has been exceeded
		if (i >= num_waypoints)
			i = 0;

		// skip waypoints we don't want to consider
		if (waypoints[i].flags & ignoreFlags)
			continue;

		// skip this waypoint if it's unavailable
		if (!WaypointAvailable(i, pBot->current_team))
			continue;

		// skip the bots current waypoint
		if (i == pBot->current_wp)
			continue;

		const int newPredictedWP = WaypointRouteFromTo(pBot->current_wp, i, pBot->current_team);

		// skip waypoints that do not branch off from the bots current route
		if (newPredictedWP == nextPredictedWP || newPredictedWP == -1)
			continue;

		const int newGoalDistance = WaypointDistanceFromTo(i, pBot->goto_wp, pBot->current_team);

		// skip waypoints that are not nearer to the goal than the bot already is
		if (newGoalDistance > currentGoalDistance || newGoalDistance == -1)
			continue;

		const int excessDistance = newGoalDistance + WaypointDistanceFromTo(pBot->current_wp, i, pBot->current_team) - currentGoalDistance;

		// find out if the extra travel is more than the bot is currently
		// willing to accept
		if (excessDistance > pBot->sideRouteTolerance)
			continue;

		// ignore shorter routes as they undo a previous branch selection
		// (because branched routes are never shorter than normal routes)
		if (excessDistance < 0)
			continue;

		// abort if the first few waypoints on this route contains any
		// unavailable waypoints or unblown detpack waypoints
		int nextWP = newPredictedWP;
		for (int j = 0; j < 18 && nextWP != i; j++) {
			if (!WaypointAvailable(nextWP, pBot->current_team))
				return;

			if (waypoints[nextWP].flags & W_FL_PATHCHECK || waypoints[nextWP].flags & W_FL_TFC_DETPACK_CLEAR || waypoints[nextWP].flags & W_FL_TFC_DETPACK_SEAL) {
				const int endWP = WaypointRouteFromTo(nextWP, i, pBot->current_team);
				if (BotPathCheck(nextWP, endWP) == false) {
					//	char msg[96];
					//	std::sprintf(msg, "path %d - %d blocked", nextWP, endWP);
					//	UTIL_HostSay(pBot->pEdict, 0, msg); //DebugMessageOfDoom!
					return;
				}
			}

			nextWP = WaypointRouteFromTo(nextWP, i, pBot->current_team);
		}

		// found a suitable waypoint
		pBot->branch_waypoint = i;

		//	char msg[96]; //DebugMessageOfDoom!
		//	std::sprintf(msg, "found a side route, tolerance: %d, re-think in %f seconds",
		//		pBot->sideRouteTolerance, pBot->f_side_route_time - pBot->f_think_time);
		//	UTIL_HostSay(pBot->pEdict, 0, msg);

		return;
	}
}

// Give this function two waypoints and it'll see if there is an obstruction
// between them.  It returns true if the path is clear.
bool BotPathCheck(const int sourceWP, const int destWP) {
	TraceResult tr;

	// trace a line from waypoint to waypoint
	UTIL_TraceLine(waypoints[sourceWP].origin, waypoints[destWP].origin, ignore_monsters, nullptr, &tr);

	// if line of sight is not blocked
	if (tr.flFraction >= 1.0f)
		return true;

	return false;
}

// This function is like BotFindSideRoute() but was designed to help bots
// free themselves if they get lost somewhere(e.g. in a detpack tunnel).
// Basically, this function looks for a waypoint that:
// 1.) is on a different route from the bots current route
// 2.) will not route back though the bots current waypoint to the goal
// It returns true if it sent the bot along a new route.
bool BotChangeRoute(bot_t* pBot) {
	if (pBot->current_wp == -1 || pBot->goto_wp == -1)
		return false;

	// remember if the bot is going to a goal waypoint or a route branching waypoint
	int goalWP = pBot->goto_wp;
	if (pBot->branch_waypoint != -1)
		goalWP = pBot->branch_waypoint;

	// remember the next waypoint on the bots route to it's current goal
	const int nextPredictedWP = WaypointRouteFromTo(pBot->current_wp, goalWP, pBot->current_team);
	if (nextPredictedWP == -1)
		return false;

	// the bots current distance from it's goal
	const int currentGoalDistance = WaypointDistanceFromTo(pBot->current_wp, goalWP, pBot->current_team);
	if (currentGoalDistance < 200)
		return false;

	// used for remembering the best waypoint found
	int newBranchWP = -1;

	// bit field of waypoint types to ignore
	static constexpr WPT_INT32 ignoreFlags = 0 + (W_FL_DELETED | W_FL_AIMING | W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_SNIPER | W_FL_TFC_TELEPORTER_ENTRANCE | W_FL_TFC_TELEPORTER_EXIT | W_FL_TFC_JUMP | W_FL_LIFT);

	// pick a random waypoint to start searching from
	int index = RANDOM_LONG(0, num_waypoints - 1);

	// start the search
	for (int i = 0; i < num_waypoints; i++) {
		// wrap the search if it exceeds the number of available waypoints
		if (index >= num_waypoints)
			index = 0;

		// skip waypoints with flags we don't want to consider
		// or unavailable waypoints
		if (waypoints[index].flags & ignoreFlags || !WaypointAvailable(index, pBot->current_team))
			continue;

		const int newPredictedWP = WaypointRouteFromTo(pBot->current_wp, index, pBot->current_team);

		// skip waypoints that do not branch off from the bots current route
		// or that don't have a route to the goal
		if (newPredictedWP == nextPredictedWP || newPredictedWP == -1)
			continue;

		// distance from this new waypoint to the bots current waypoint
		const int interimDist = WaypointDistanceFromTo(index, pBot->current_wp, pBot->current_team);

		// the best waypoints have no route back through the bot's current waypoint
		if (interimDist == -1) {
			newBranchWP = index;
			break;
		}
		// distance from this waypoint to the bots goal
		const int newGoalDistance = WaypointDistanceFromTo(index, goalWP, pBot->current_team);

		// distance from waypoint to bot + bots current distance from goal
		const int maxRouteDistance = interimDist + currentGoalDistance;

		// look for a waypoint that will take the bot nearer to it's goal
		// without coming back through the bots current waypoint
		if (newGoalDistance < maxRouteDistance) {
			newBranchWP = index;
			break;
		}
	}

	// found a suitable waypoint?
	if (newBranchWP != -1) {
		/*	char msg[80];
						std::sprintf(msg, "Got lost at %d going to %d, found another route via: %d",
										pBot->current_wp, goalWP, newBranchWP);
						UTIL_HostSay(pBot->pEdict, 0, msg); //DebugMessageOfDoom!*/

		pBot->branch_waypoint = newBranchWP;

		return true;
	}

	return false;
}

// This function can be used to make the bot pick a different goal waypoint
// to the specified one, and that has the specified waypoint flags.
// i.e. if a bot has gotten stuck going to one flag waypoint then this can
// be used to send the bot to a different flag waypoint instead.
bool BotSetAlternativeGoalWaypoint(bot_t* const pBot, int& r_goalWP, const WPT_INT32 flags) {
	if (r_goalWP < 0)
		return false; // sanity check

	// make sure the bot has a sane current waypoint(e.g. not behind a wall)
	BotFindCurrentWaypoint(pBot);

	const int nextWP = WaypointRouteFromTo(pBot->current_wp, r_goalWP, pBot->current_team);
	if (nextWP == -1)
		return false; // sanity check

	constexpr unsigned char MAX_INDICES = 5;
	int indices[MAX_INDICES];
	int count = 0;

	// find suitable waypoints with matching flags...
	for (int index = 0; index < num_waypoints; index++) {
		if (!(waypoints[index].flags & flags))
			continue; // skip this waypoint if the flags don't match

		// skip any deleted or aiming waypoints
		if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING)
			continue;

		// need to skip wpt if not available to the bots team
		// also - make sure a route exists to this waypoint
		if (!WaypointAvailable(index, pBot->current_team) || WaypointRouteFromTo(pBot->current_wp, index, pBot->current_team) == -1)
			continue;

		// ignore if this new waypoint goes on the same route as the old one
		const int routeNextWP = WaypointRouteFromTo(pBot->current_wp, index, pBot->current_team);
		if (routeNextWP == nextWP)
			continue;

		// check the distance from this waypoint to the current goal waypoint
		// to see if they are too near to each other
		int routeDistance = WaypointDistanceFromTo(index, r_goalWP, pBot->current_team);
		if (routeDistance != -1 && routeDistance < 800)
			continue;

		// now check in the other direction, in case there is only a
		// one way path between the two waypoints
		routeDistance = WaypointDistanceFromTo(r_goalWP, index, pBot->current_team);
		if (routeDistance != -1 && routeDistance < 800)
			continue;

		indices[count] = index;
		++count;

		if (count >= MAX_INDICES)
			break; // list is full
	}

	// found one?
	if (count > 0) {
		//	UTIL_HostSay(pBot->pEdict, 0, "alternative goal waypoint found"); //DebugMessageOfDoom!
		r_goalWP = indices[random_long(0, count - 1)];
		return true;
	}

	return false;
}

// Some waypoint files are not properly tested and contain waypoint traps.
// e.g. a map area has a waypoint route leading in, but no route leading out.
// Or the nearest current waypoint is completely unreachable.
// This function is designed to find a way out for a trapped bot by giving
// it a new current waypoint that should help.  Returns false upon failure.
static bool BotEscapeWaypointTrap(bot_t* const pBot, const int goalWP) {
	if (goalWP < 0)
		return false; // sanity check

	//	UTIL_HostSay(pBot->pEdict, 0, "Escaping a waypoint trap"); //DebugMessageOfDoom!

	const int currentRoutDist = WaypointDistanceFromTo(pBot->current_wp, goalWP, pBot->current_team);

	// find all the waypoints with the matching flags...
	for (int index = 0; index < num_waypoints; index++) {
		// skip any deleted or aiming waypoints
		if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING)
			continue;

		// always pick a new current waypoint, the old one may be unreachable
		if (index == pBot->current_wp)
			continue;

		// make sure a route exists from this waypoint to the goal waypoint,
		// and that the bot can see it
		if (WaypointAvailable(index, pBot->current_team)) {
			const int routeDistance = WaypointDistanceFromTo(index, goalWP, pBot->current_team);

			if (routeDistance > -1 && (currentRoutDist == -1 || routeDistance < currentRoutDist) && VectorsNearerThan(pBot->pEdict->v.origin, waypoints[index].origin, 800.0) && BotCanSeeOrigin(pBot, waypoints[index].origin)) {
				// found a suitable waypoint
				pBot->current_wp = index;
				return true;
			}
		}
	}

	return false; // not a good result, the bot may stay stuck in a loop
}

// This function looks for a waypoint that will lead a bot away from the
// specified vector, and that is not visible from the specified vector.
// min_dist specifies the minimum retreat distance you want.
// Returns the waypoint found on success, -1 on failure.
int BotFindRetreatPoint(bot_t* const pBot, const int min_dist, const Vector& r_threatOrigin) {
	if (pBot->current_wp == -1)
		return -1;

	// bit field of waypoint types to ignore
	static constexpr WPT_INT32 ignoreFlags = 0 + (W_FL_DELETED | W_FL_AIMING | W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_SNIPER | W_FL_TFC_TELEPORTER_ENTRANCE | W_FL_TFC_TELEPORTER_EXIT | W_FL_TFC_JUMP | W_FL_LIFT);

	// distance from bot to threat
	const float botThreatDistance = (pBot->pEdict->v.origin - r_threatOrigin).Length();

	int nextWP;
	const int max_dist = min_dist + 1000; // used to stop bots running too far away
	int bestIndex = -1;
	TraceResult tr;

	// start the search
	int index = static_cast<int>(random_long(0, num_waypoints));
	for (int i = 0; i < num_waypoints; i++, index++) {
		if (index >= num_waypoints)
			index = 0; // wrap if waypoint list exceeded

		// skip waypoints we don't want to consider
		if (waypoints[index].flags & ignoreFlags)
			continue;

		// skip this waypoint if it's team specific and teams don't match...
		if (!WaypointAvailable(index, pBot->current_team))
			continue;

		if (index == pBot->current_wp)
			continue; // skip the bots current waypoint

		const int routeDistance = WaypointDistanceFromTo(pBot->current_wp, index, pBot->current_team);

		if (routeDistance < min_dist || routeDistance > max_dist)
			continue; // ignore waypoints that are too near or too far away

		// find the next waypoint on the route to this waypoint
		nextWP = WaypointRouteFromTo(pBot->current_wp, index, pBot->current_team);

		// check for the ideal waypoint
		// is the next waypoint on the route further from the threat?
		if (!VectorsNearerThan(waypoints[nextWP].origin, r_threatOrigin, botThreatDistance)) {
			// is the end waypoint also further from the threat?
			if (!VectorsNearerThan(waypoints[index].origin, r_threatOrigin, botThreatDistance)) {
				bestIndex = index;

				// check for non-visibility
				UTIL_TraceLine(waypoints[index].origin, r_threatOrigin, ignore_monsters, nullptr, &tr);

				// is this waypoint hidden by scenery?
				// if so immediately accept this waypoint as the best candidate
				if (tr.flFraction < 1.0f)
					break;
			}
		}
		// in case the search isn't having much luck remember any waypoint
		// that will at least send the bot away from the threat
		else {
			if (bestIndex == -1 && !VectorsNearerThan(waypoints[index].origin, r_threatOrigin, botThreatDistance))
				bestIndex = index;
		}
	}

	// if successful consider going for the next waypoint on the route right now
	if (bestIndex != -1) {
		// show where the bot should be going (for debugging purposes)
		//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
		//		waypoints[bestIndex].origin, 10, 2, 50, 250, 250, 200, 10);

		nextWP = WaypointRouteFromTo(pBot->current_wp, bestIndex, pBot->current_team);
		if (FVisible(waypoints[nextWP].origin, pBot->pEdict))
			pBot->current_wp = nextWP;
	}

	return bestIndex;
}

// This function looks for a waypoint that will lead a bot away from the
// specified entity(which is assumed to be some kind of explosive object).
// min_dist specifies the minimum retreat distance you want.
// Returns the waypoint found on success, -1 on failure.
int BotFindThreatAvoidPoint(bot_t* const pBot, const int min_dist, const edict_t* pent) {
	if (pBot->current_wp == -1 || FNullEnt(pent))
		return -1;

	// bit field of waypoint types to ignore
	static constexpr WPT_INT32 ignoreFlags = 0 + (W_FL_DELETED | W_FL_AIMING | W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_SNIPER | W_FL_TFC_TELEPORTER_ENTRANCE | W_FL_TFC_TELEPORTER_EXIT | W_FL_TFC_JUMP | W_FL_LIFT);

	// distance from bot to threat
	const float botThreatDistance = (pBot->pEdict->v.origin - pent->v.origin).Length();

	const int max_dist = min_dist + 700; // used to stop bots running too far away

	// start the search
	int index = static_cast<int>(random_long(0, num_waypoints));
	for (int i = 0; i < num_waypoints; i++, index++) {
		if (index >= num_waypoints)
			index = 0; // wrap if waypoint list exceeded

		// skip waypoints we don't want to consider
		if (waypoints[index].flags & ignoreFlags)
			continue;

		// skip this waypoint if it's team specific and teams don't match...
		if (!WaypointAvailable(index, pBot->current_team))
			continue;

		if (index == pBot->current_wp)
			continue; // skip the bots current waypoint

		const int routeDistance = WaypointDistanceFromTo(pBot->current_wp, index, pBot->current_team);

		if (routeDistance < min_dist || routeDistance > max_dist)
			continue; // ignore waypoints that are too near or too far away

		// pick the next waypoint on the route to this waypoint
		const int nextWP = WaypointRouteFromTo(pBot->current_wp, index, pBot->current_team);

		// we've found the right waypoint if the next waypoint on the route is further
		// from the threat than the bot is, and the end waypoint is far enough from the threat
		if (nextWP != -1 && !VectorsNearerThan(waypoints[nextWP].origin, pent->v.origin, botThreatDistance) && !VectorsNearerThan(waypoints[index].origin, pent->v.origin, min_dist)) {
			// show where the bot should be going (for debugging purposes)
			//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
			//		waypoints[index].origin, 10, 2, 250, 50, 50, 200, 10);

			// consider going for the next waypoint on the route right now
			if (FVisible(waypoints[nextWP].origin, pBot->pEdict))
				pBot->current_wp = nextWP;

			return index;
		}
	}

	return -1; // failure
}

// This function returns the waypoint of a randomly selected flag waypoint
// or -1 on failure.
int BotFindFlagWaypoint(const bot_t* pBot) {
	int flagWP = -1;

	if (WaypointTypeExists(W_FL_TFC_FLAG, pBot->current_team))
		flagWP = WaypointFindRandomGoal(pBot->current_wp, pBot->current_team, W_FL_TFC_FLAG);

	if (flagWP == -1)
		flagWP = WaypointFindRandomGoal(pBot->current_wp, -1, W_FL_TFC_FLAG);

	return flagWP;
}

// This function finds a waypoint near a random enemy defender waypoint.
// Returns the waypoint found on success, -1 on failure.
int BotTargetDefenderWaypoint(const bot_t* pBot) {
	// perform basic sanity checks
	if (pBot->current_wp < 0 || pBot->current_wp >= num_waypoints)
		return 0;

	// pick an enemy team to harrass
	const int target_team = PickRandomEnemyTeam(pBot->current_team);
	if (target_team == -1)
		return 0;

	// pick a random waypoint to start searching from
	int index = static_cast<int>(random_long(0, num_waypoints - 1));

	// bit field of waypoint types the bot is looking for
	static constexpr WPT_INT32 validFlags = 0 + (W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_SNIPER);

	for (int waypoints_checked = 0; waypoints_checked < num_waypoints; waypoints_checked++, index++) {
		// wrap the search if it exceeds the number of available waypoints
		if (index >= num_waypoints)
			index = 0;

		// skip any deleted or aiming waypoints
		if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING)
			continue;

		// skip non-defender type waypoints
		// (i.e. not defender, demoman, sentry gun, sniper)
		if (!(waypoints[index].flags & validFlags))
			continue;

		if (index == pBot->current_wp)
			continue; // skip the bots current waypoint

		// skip this waypoint if it's not available to the enemy team
		if (!WaypointAvailable(index, target_team))
			continue;

		// skip waypoints that are too near to the bot
		if (VectorsNearerThan(waypoints[index].origin, waypoints[pBot->current_wp].origin, 400.0))
			continue;

		// look for a waypoint near the target and return true
		const int goalWP = WaypointFindRandomGoal_R(waypoints[index].origin, true, 500.0f, -1, 0);

		if (goalWP != -1) {
			//	char msg[80]; //DebugMessageOfDoom!
			//	std::sprintf(msg, "targetting defender waypoints, currentWP %d, newWP %d",
			//		pBot->current_wp, goalWP);
			//	UTIL_HostSay(pBot->pEdict, 0, msg);

			return goalWP;
		}
	}

	return -1;
}

// This function finds a waypoint near the furthest enemy defender
// waypoint, and was mainly intended for use when a bot becomes infected.
// Returns the waypoint found, -1 on failure.
int BotFindSuicideGoal(const bot_t* pBot) {
	if (pBot->current_wp == -1)
		return -1;

	// pick an enemy team to attack
	const int target_team = PickRandomEnemyTeam(pBot->current_team);
	if (target_team == -1)
		return -1;

	// if the bot has a known spawn location, set that as the waypoint to
	// search for the furthest enemy defender waypoint from
	int waypoint_from = spawnAreaWP[pBot->current_team];
	if (waypoint_from == -1)
		waypoint_from = pBot->current_wp;

	// bit field of waypoint types the bot is looking for
	static constexpr WPT_INT32 validFlags = 0 + (W_FL_TFC_PL_DEFEND | W_FL_TFC_PIPETRAP | W_FL_TFC_SENTRY | W_FL_SNIPER);

	// try to find a waypoint which is further from the bot
	int furthestIndex = -1;
	float furthestDistance = 800.0f;
	for (int index = 0; index < num_waypoints; index++) {
		// skip non-defender type waypoints
		// (i.e. not defender, sentry gun, sniper)
		if (!(waypoints[index].flags & validFlags))
			continue;

		if (waypoints[index].flags & W_FL_DELETED || waypoints[index].flags & W_FL_AIMING)
			continue; // skip any deleted or aiming waypoints

		// skip this waypoint if it's not available to the enemy team
		if (!WaypointAvailable(index, target_team))
			continue;

		if (index == pBot->current_wp)
			continue; // skip the bots current waypoint

		const float distance = (waypoints[index].origin - waypoints[waypoint_from].origin).Length();
		if (distance > furthestDistance) {
			furthestDistance = distance;
			furthestIndex = index;
		}
	}

	if (furthestIndex == -1)
		return -1;

	// look for a waypoint near the target waypoint and return it
	const int goalWP = WaypointFindNearest_V(waypoints[furthestIndex].origin, REACHABLE_RANGE, pBot->current_team);

	return goalWP;
}

// BotFindFlagGoal - This function looks for a flag goal waypoint.
// Returns the waypoint found if successful, -1 otherwise.
int BotFindFlagGoal(const bot_t* pBot) {
	int goalWP = WaypointFindRandomGoal(pBot->current_wp, pBot->current_team, W_FL_TFC_FLAG_GOAL);

	if (goalWP == -1)
		goalWP = WaypointFindRandomGoal(pBot->current_wp, -1, W_FL_TFC_FLAG_GOAL);

	return goalWP;
}

// BotGoForSniperSpot - This function sends a bot after a sniper spot.
// Returns the waypoint found.
int BotGoForSniperSpot(const bot_t* pBot) {
	int sniperWP;

	// occasionally go for the nearest snipe point(nearer is usually safer)
	if (static_cast<int>(pBot->pEdict->v.frags) <= pBot->scoreAtSpawn && random_long(1, 1000) < 334) {
		sniperWP = WaypointFindNearestGoal(pBot->current_wp, pBot->current_team, INT_MAX, W_FL_SNIPER);

		if (sniperWP == -1)
			sniperWP = WaypointFindNearestGoal(pBot->current_wp, -1, INT_MAX, W_FL_SNIPER);

		return sniperWP;
	}

	sniperWP = WaypointFindRandomGoal(pBot->current_wp, pBot->current_team, W_FL_SNIPER);

	if (sniperWP == -1)
		sniperWP = WaypointFindRandomGoal(pBot->current_wp, -1, W_FL_SNIPER);

	return sniperWP;
}

// This function will search for the nearest waypoint that is higher than the bot
// and near or above the surface of water.  i.e. somewhere a bot can go breathe.
// Returns the waypoint found, or -1 if not found.
int BotDrowningWaypointSearch(const bot_t* pBot) {
	int minDistance = 2500;
	int bestIndex = -1;

	for (int index = 0; index < num_waypoints; index++) {
		// only consider plain waypoints(i.e. with no flags)
		if (waypoints[index].flags != 0)
			continue;

		// make sure the waypoint is higher than the bot
		if (waypoints[index].origin.z <= pBot->pEdict->v.origin.z)
			continue;

		const int routeDistance = WaypointDistanceFromTo(pBot->current_wp, index, pBot->current_team);
		if (routeDistance < minDistance && routeDistance != -1) {
			// accept the waypoint if there is empty space just above it
			if (UTIL_PointContents(waypoints[index].origin + Vector(0.0f, 0.0f, 40.0f)) == CONTENTS_EMPTY) {
				minDistance = routeDistance;
				bestIndex = index;
			}
		}
	}

	return bestIndex;
}

// This function attempts to send the specified bot to a teleport entrance
// that will provide a quicker route to its ultimate goal.
// It returns true on success, false on failure.
bool BotFindTeleportShortCut(bot_t* pBot) {
	if (bot_can_use_teleporter == false || pBot->bot_has_flag || BufferContainsJobType(pBot, JOB_USE_TELEPORT))
		return false;

	// the teleporter found has got to cut the route distance to less than this amount
	int shortestRoute = WaypointDistanceFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team) - 1200;

	// is the route too short anyway to bother with teleports?
	if (shortestRoute < 300)
		return false;

	int shortestIndex = -1;

	// search the bots memory of Teleporter pairs for a short cut
	for (int i = 0; i < MAX_BOT_TELEPORTER_MEMORY; i++) {
		// is this a pair of teleporters the bot has used before?
		// we assume the exit still exists, if it doesn't the bot can learn
		// about that when it tries to teleport
		if (pBot->telePair[i].entranceWP > -1 && pBot->telePair[i].entranceWP < num_waypoints && pBot->telePair[i].exitWP > -1 && pBot->telePair[i].exitWP < num_waypoints && pBot->telePair[i].entrance != nullptr) {
			// distance via this known teleporter pair
			const int totalDistance = WaypointDistanceFromTo(pBot->current_wp, pBot->telePair[i].entranceWP, pBot->current_team) + WaypointDistanceFromTo(pBot->telePair[i].exitWP, pBot->goto_wp, pBot->current_team);

			// shortest route yet?
			if (totalDistance > -1 && totalDistance < shortestRoute) {
				shortestRoute = totalDistance;
				shortestIndex = i;
			}
		}
	}

	// found a teleporter to use that saves travel time?
	if (shortestIndex != -1) {
		job_struct* newJob = InitialiseNewJob(pBot, JOB_USE_TELEPORT);
		if (newJob != nullptr) {
			newJob->object = pBot->telePair[shortestIndex].entrance;
			newJob->waypoint = pBot->telePair[shortestIndex].entranceWP;
			SubmitNewJob(pBot, JOB_USE_TELEPORT, newJob);
			//	UTIL_BotLogPrintf("%s, got tele shortcut via %d\n", pBot->name, newJob->waypoint);
		}

		return true;
	}

	return false;
}

// BotCheckForRocketJump - Here, we look through the list of RJ/CJ waypoints
// in the map to find the closest one.
// Once we find the closest we check to see if we can see it, and if
// it would save us distance to our current goal.
// If so, we initiate a Rocket Jump for that waypoint.
// There are numerous checks for abort conditions in here.
// TODO : This needs to be modified to consider the closest, say..
// 2-5 RJ waypoints. Otherwise points set somewhat close will be ignored
// and the closest will get favored every time, often resulting in the same point.
// AVOID TRACELINES TILL NECESSARY. Prioritize the top 3-5
// points by distance saved to the bots goal before
// checking for visibility.
static void BotCheckForRocketJump(bot_t* pBot) {
	// sanity checking
	if (pBot->current_wp == -1 || pBot->bot_skill > 3 || num_waypoints < 1 || BufferContainsJobType(pBot, JOB_ROCKET_JUMP))
		return;

	const char* cvar_ntf_const = CVAR_GET_STRING("neotf");
	const std::string cvar_ntf = cvar_ntf_const;

	// char *cvar_ntfexclusive = (char *)CVAR_GET_STRING("ntf_feature_exclusive");

	// allow Neotf spies and pyros to jump at RJ points
	if (pBot->pEdict->v.playerclass == TFC_CLASS_PYRO) {
		const char* cvar_jetpack_const = CVAR_GET_STRING("ntf_feature_jetpack");
		const std::string cvar_jetpack = cvar_jetpack_const;
		if (std::strcmp(cvar_ntf.c_str(), "1") == 0 && std::strcmp(cvar_jetpack.c_str(), "1") == 0) // No neotf or jetpack
		{
			// Jetpack enabled
		}
		else
			return;
	}

	else if (pBot->pEdict->v.playerclass == TFC_CLASS_SPY) {
		return; // TODO : KICK SPIES OUT FOR NOW, UNTIL HOVERBOARD.

		/*	char *cvar_hoverboard = (char *)CVAR_GET_STRING("ntf_feature_hoverboard");
						if((std::strcmp(cvar_ntf, "1") == 0)
										&& (std::strcmp(cvar_hoverboard, "1") == 0)) // No neotf or jetpack
						{
										// Hoverboard enabled
						}
						else return;*/
	}
	else if (PlayerHealthPercent(pBot->pEdict) - 15 < pBot->trait.health || PlayerArmorPercent(pBot->pEdict) - 26 < pBot->trait.health) {
		// stop soldiers from rocket jumping when with low health/armour
		// 1 rocket jump subtracts a maximum of 15 health and 55 armour
		return;
	}

	std::optional<int> closestRJ;
	float closest2D = 500.1f;
	float zDiff;
	
	// random to simulate how high the bot thinks the jump will go this time
	const float maxJumpHeight = random_float(340.0f, 440.0f);
	
	// find the closest rocket jump point
	for (int (&RJPoint)[2] : RJPoints) {
		// -1 means we are at the end of the list.
		if (RJPoint[RJ_WP_INDEX] == -1)
			break;
		
		// If its our team or not team specific.
		if (RJPoint[RJ_WP_TEAM] == -1 || RJPoint[RJ_WP_TEAM] == pBot->current_team) {
			zDiff = waypoints[RJPoint[RJ_WP_INDEX]].origin.z - pBot->pEdict->v.origin.z;
			
			// is this RJ waypoints height reachable with a rocket jump?
			// on a server with 800 gravity rocket jumps can reach a height of about 440
			if (zDiff > 54.0f && zDiff < maxJumpHeight) {
				const float distance2D = (pBot->pEdict->v.origin - waypoints[RJPoint[RJ_WP_INDEX]].origin).Length2D();
				if (distance2D > 150.0f // don't want RJ points that are too close
					&& (!closestRJ || distance2D < closest2D)) {
					closest2D = distance2D;
					closestRJ = RJPoint[RJ_WP_INDEX];
				}
			}
		}
	}
	
	// If theres no RJ point get out.
	if (!closestRJ)
		return;

	// Check if its a good time to jump
	// Resulting waypoint closer to goal than we are now
	// (> 1000 distance savings for now)
	const int distanceSaved = WaypointDistanceFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team) - WaypointDistanceFromTo(*closestRJ, pBot->goto_wp, pBot->current_team);

	// Don't bother if the distance it saves us is less than this.
	if (distanceSaved < 1000)
		return;

	TraceResult result;

	// fast-path: if the visibility table confirms ground-level line-of-sight
	// the jump path is through a wide open area and will be clear - [APG]RoboCop[CL]
	if (!WaypointVisibleFromTo(pBot->current_wp, *closestRJ)) {
		// Check visibility from where the bot's head is to a point in the air above
		// i.e. check for a low ceiling
		zDiff = waypoints[*closestRJ].origin.z - pBot->pEdict->v.origin.z;
		UTIL_TraceLine(pBot->pEdict->v.origin + pBot->pEdict->v.view_ofs, pBot->pEdict->v.origin + Vector(0.0f, 0.0f, zDiff), ignore_monsters, pBot->pEdict->v.pContainingEntity, &result);

		if (result.flFraction < 1.0f)
			return; // can't see it

		// Check visibility from a point in the air above the bot to the RJ waypoint
		// this improves the bots ability to properly detect RJ waypoints
		UTIL_TraceLine(pBot->pEdict->v.origin + Vector(0.0f, 0.0f, zDiff), waypoints[*closestRJ].origin, ignore_monsters, pBot->pEdict->v.pContainingEntity, &result);

		if (result.flFraction < 1.0f)
			return; // can't see it
	}
	// debug stuff
	//	WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
	//		waypoints[closestRJ].origin, 10, 2, 250, 250, 50, 200, 10);

	//	UTIL_HostSay(pBot->pEdict, 0, "RJ waypoint seen");

	// set up a job to handle the jump
	job_struct* newJob = InitialiseNewJob(pBot, JOB_ROCKET_JUMP);
	if (newJob != nullptr) {
		newJob->waypoint = *closestRJ;
		SubmitNewJob(pBot, JOB_ROCKET_JUMP, newJob);
	}

	//	UTIL_BotLogPrintf("%s: RJ waypoint %d\n", pBot->name, newJob.waypoint);

	/*char msg[80];
		std::sprintf(msg, "CloseDist: %f Distance: %f zDiff %f ",
						pBot->RJClosingDistance, distance2D, zDiff);
		UTIL_HostSay(pBot->pEdict, 0, msg);*/
}

// BotCheckForConcJump - Here, we look through the list of RJ/CJ
// waypoints in the map to find the closest one.
// Once we find the closest we check to see if we can see it, and if it
// would save us distance to our current goal.
// If so, we initiate a Conc Jump for that waypoint. There are numerous
// checks for abort conditions in here.
// Conc waypoints. Otherwise points set somewhat close will be ignored and
// the closest will get favored every time, often resulting in the same point.
// AVOID TRACELINES TILL NECESSARY. Prioritize the top 3-5 points by
// distance saved to the bots goal before checking for visibility.
static void BotCheckForConcJump(bot_t* pBot) {
	// sanity check
	if (pBot->current_wp == -1 || pBot->goto_wp == -1 || pBot->bot_skill > 3 || pBot->grenades[SecondaryGrenade] < 1 || num_waypoints < 1 || bot_use_grenades == 0)
		return;

	// Lets not check for concs if we are close to our goal.
	if (WaypointDistanceFromTo(pBot->current_wp, pBot->goto_wp, pBot->current_team) < 2000)
		return;

	// make sure we can set up a concussion jump job to handle the jump itself
	if (BufferContainsJobType(pBot, JOB_CONCUSSION_JUMP))
		return;

	// We need to look ahead based on this speed, to try and estimate
	// where we will be in 4 seconds
	// If we can see a conc point from there, prime now.

	// Need to get my velocity
	const float mySpeed = pBot->pEdict->v.velocity.Length2D();

	// Lets try enforcing a minimum speed for considering jumps.
	if (mySpeed < 180.0f)
		return;

	int currentWP = pBot->current_wp;
	std::optional<int> endWP;
	float distAhead = 0.0f;
	int safetyCounter = 0;

	// try to predict what waypoint the bot will be at a few seconds
	// from now
	while (distAhead < mySpeed * 3.0f && safetyCounter < 30) {
		// Get the next waypoint in our route.
		endWP = WaypointRouteFromTo(currentWP, pBot->goto_wp, pBot->current_team);
		if (endWP == -1 || endWP > num_waypoints)
			return;

		// Add the distance
		distAhead += static_cast<float>(WaypointDistanceFromTo(currentWP, endWP.value(), pBot->current_team));

		// Set current wp to the next one.
		// This should keep checking ahead with each loop iteration.
		currentWP = endWP.value();
		safetyCounter++;
	}

	// Abort if for some reason the safety counters limit was reached.
	if (safetyCounter == 30 || !endWP) {
		// UTIL_HostSay(pBot->pEdict, 0, "Safety counter hit");
		return;
	}

	std::optional<int> closestJumpWP;
	float closest2D = random_float(400.0f, 700.0f); // random to cover different situations
	float zDiff;

	// Find the closest RJ point from the bots predicted waypoint location
	for (int (&RJPoint)[2] : RJPoints) {
		// -1 means we are at the end of the list.
		if (RJPoint[RJ_WP_INDEX] == -1)
			break;

		// If its our team or not team specific.
      if (RJPoint[RJ_WP_TEAM] == -1 || RJPoint[RJ_WP_TEAM] == pBot->current_team) {
			zDiff = waypoints[RJPoint[RJ_WP_INDEX]].origin.z - waypoints[endWP.value()].origin.z;

			// is this RJ waypoints height reachable with a concussion jump?
			// on a server with 800 gravity concussion jumps can reach a height of about 490
			if (zDiff > 54.0f && zDiff < 450.0f) {
				const float distance2D = (waypoints[endWP.value()].origin - waypoints[RJPoint[RJ_WP_INDEX]].origin).Length2D();

				if (distance2D < closest2D) {
					closest2D = distance2D;
					closestJumpWP = RJPoint[RJ_WP_INDEX];
				}
			}
		}
	}

	// Abort if theres no RJ waypoint near enough.
	if (!closestJumpWP)
		return;

	const int distanceSaved = WaypointDistanceFromTo(endWP.value(), pBot->goto_wp, pBot->current_team) - WaypointDistanceFromTo(*closestJumpWP, pBot->goto_wp, pBot->current_team);

	// Don't bother if the distance it saves us is less than this.
	if (distanceSaved < 1000)
		return;

	// Got the waypoint out near our reach.
	/*if(g_bot_debug)
					WaypointDrawBeam(INDEXENT(1), pBot->pEdict->v.origin,
									waypoints[endWP].origin, 30, 0, 125, 125, 125, 250, 5);*/

	TraceResult result;

	// fast-path: if the visibility table confirms ground-level line-of-sight
   // the jump path is through a wide open area and will be clear - [APG]RoboCop[CL]
	if (!WaypointVisibleFromTo(endWP.value(), *closestJumpWP)) {
		// Check visibility from where the bot's head will be to a point in the air above
		// i.e. check for a low ceiling
		zDiff = waypoints[*closestJumpWP].origin.z - waypoints[endWP.value()].origin.z;
		UTIL_TraceLine(waypoints[endWP.value()].origin + pBot->pEdict->v.view_ofs, waypoints[endWP.value()].origin + Vector(0.0f, 0.0f, zDiff), ignore_monsters, pBot->pEdict->v.pContainingEntity, &result);

		if (result.flFraction < 1.0f)
			return; // can't see it

		// Check visibility from a point in the air above the bot to the RJ waypoint
		// this improves the bots ability to properly detect RJ waypoints
		UTIL_TraceLine(waypoints[endWP.value()].origin + Vector(0.0f, 0.0f, zDiff), waypoints[*closestJumpWP].origin, ignore_monsters, pBot->pEdict->v.pContainingEntity, &result);

		if (result.flFraction < 1.0f)
			return; // can't see it
	}
	// success - it's time to set up a concussion jump job
	job_struct* newJob = InitialiseNewJob(pBot, JOB_CONCUSSION_JUMP);
	if (newJob != nullptr) {
		newJob->waypoint = endWP.value();
		newJob->waypointTwo = *closestJumpWP;

		SubmitNewJob(pBot, JOB_CONCUSSION_JUMP, newJob);
	}
}