parser.h

#ifndef PARSER_H
#define PARSER_H

#include <string>
#include <vector>
#include <memory>
#include "database.h"

namespace databos {

enum class CommandType {
    CREATE_TABLE,
    DROP_TABLE,
    INSERT,
    SELECT,
    UPDATE,
    DELETE,
    SHOW_TABLES,
    DESCRIBE,
    UNKNOWN,
    EXIT,
    HELP
};

struct ParsedCommand {
    CommandType type;
    std::string tableName;
    std::vector<Column> columns;
    std::map<std::string, ColumnValue> values;
    std::vector<std::string> selectColumns;
    std::string whereColumn;
    std::string whereOp;
    ColumnValue whereValue;
    std::string updateColumn;
    ColumnValue updateValue;
    bool hasWhere;
    std::string errorMessage;
    
    ParsedCommand() : type(CommandType::UNKNOWN), hasWhere(false) {}
};

class Parser {
public:
    static ParsedCommand parse(const std::string& query);
    
private:
    static std::vector<std::string> tokenize(const std::string& query);
    static std::string trim(const std::string& str);
    static std::string toUpper(const std::string& str);
    static DataType stringToDataType(const std::string& typeStr);
    static ColumnValue parseValue(const std::string& value, DataType type);
};

} 

#endif