#ifndef SCRIPTABLE_CONTROLLER_API_H
#define SCRIPTABLE_CONTROLLER_API_H

#include <functional>
#include "core/CoreIncludes.h"
#include "tools/Timer.h"
#include "OgreVector3.h"

struct lua_State;

namespace orxonox
{

class ScriptableController;
class WorldEntity;
class Pawn;

/**
 * @brief API for ScriptableController's lua-scripts
 *
 * Defines the interface that lua can use in the scripts to communicate with orxonox.
 *
 * \sa ScriptableController
 */
class ScriptableControllerAPI
{
friend class ScriptableController;

public:
    /**
     * @brief Constructs the API with the given lua state
     * @param lua The lua state
     * @param controller The parent controller
     *
     * This will not run any scripts, it'll just make the API visible to lua.
     */
    ScriptableControllerAPI(lua_State *lua, ScriptableController *controller);

    /**
     * @brief Destructs the API and closes the lua state.
     */
    ~ScriptableControllerAPI();

// ### API ####################################################################

    /**
     * @brief Print a message
     * @param msg The message
     *
     * Use this function instead of printing from lua directly, because that will mess up the
     * output as it is not synchronized.
     */
    void orxPrint(std::string msg);

    /**
     * @brief Register a function that will be called after a timeout
     * @param callback The function to call after the timeout expired
     * @param timeout The timeout in seconds
     */
    void registerAfterTimeout(std::function<void (void)> callback, double timeout);

    /**
     * @brief Register a function that will be called when two object are close to eachother
     * @param callback The function to call when the objects are close enough
     * @param id1 The first object
     * @param id2 The second object
     * @param distance If the distance between the two objects is smaller than this value,
     * the function is called
     *
     * Note: Distances are only checked every 0.5s!
     */
    void registerAtNearObject(std::function<void(std::string, std::string)> callback, std::string id1, std::string id2, double distance);

    /**
     * @brief Register a function that will be called when an object is close to a certain point
     * @param callback The function to call when the object is close enough
     * @param id The object
     * @param x X-coordinate of the point
     * @param y Y-coordinate of the point
     * @param z Z-coordinate of the point
     * @param distance If the distance between the object and the point is smaller than this value, the
     * function is called.
     *
     * Note: Distances are only checked every 0.5s!
     */
    void registerAtNearPoint(std::function<void (std::string)> callback, std::string id, double x, double y, double z, double distance);

    /**
     * @brief Register a function that will be called when an object enters a cubic area
     * @param callback The function to call when the object entered the area
     * @param id The object
     * @param x X-coordinate of the top-left corner
     * @param y Y-coordinate of the top-left corner
     * @param z Z-coordinate of the top-left corner
     * @param dx Size in X-direction of the cube
     * @param dy Size in Y-direction of the cube
     * @param dz Size in Z-direction of the cube
     *
     * Note: Distances are only checked every 0.5s!
     */
    void registerAtAreaEnter(std::function<void (std::string)> callback, std::string id, int x, int y, int z, int dx, int dy, int dz);

    /**
     * @brief Register a function that will be called when an object leaves a cubic area
     * @param callback The function to call when the object left the area
     * @param id The object
     * @param x X-coordinate of the top-left corner
     * @param y Y-coordinate of the top-left corner
     * @param z Z-coordinate of the top-left corner
     * @param dx Size in X-direction of the cube
     * @param dy Size in Y-direction of the cube
     * @param dz Size in Z-direction of the cube
     *
     * Note: Distances are only checked every 0.5s!
     */
    void registerAtAreaLeave(std::function<void (std::string)> callback, std::string id, int x, int y, int z, int dx, int dy, int dz);

    /**
     * @brief Register a function that will be called when a Pawn is killed
     * @param callback The function to call as soon as the Pawn is dead
     * @param id The Pawn
     *
     * Note: Once a Pawn is dead, the callback is removed, even if the pawn got magically revived.
     */
    void registerAtPawnKilled(std::function<void (std::string)> callback, std::string id);

    /**
     * @brief Register a function that will be called when a Pawn is hit
     * @param callback The function to call as soon as the Pawn is hit
     * @param id The Pawn
     *
     * Note: Once a Pawn is dead, the all hit-callbacks are removed, even if the pawn got magically revived.
     */
    void registerAtPawnHit(std::function<void (std::string, std::string, double, double)> callback, std::string id);

    /**
     * @brief Kill a pawn
     * @param id The pawn to kill
     *
     * Note: It might up to 0.5s until the pawn is actually killed.
     */
    void killPawn(std::string id);

    /**
     * @brief Spawn an object
     * @param type Name of the class of the object you want to spawn
     * @param id The newly created ID that can be used to access this object
     *
     * IMPORTANT: Do not use this function yet, it only has minimal functionality and is not
     * really helpful as it is.
     */
    void spawn(std::string type, std::string id);

    void spawnTest(std::string id);

    /**
     * @brief Set the position of an object
     * @param id The ID of the object
     * @param x The position on the x-axis
     * @param y The position on the y-axis
     * @param z The position on the z-axis
     */
    void setPosition(std::string id, double x, double y, double z);

    /**
     * @brief Set the orientation of an object
     * @param id The ID of the object
     * @param x The x component of the axis vector
     * @param y The y component of the axis vector
     * @param z The z component of the axis vector
     * @param angle The angle around the axis
     *
     * To set the orientation, you have to specify the direction that the
     * object should be facing with the vector (x, y, z) and the rotation
     * of the object around this axis with 'angle', which has to be given
     * in degrees, NOT radian. The vector does not have to be normalized.
     */
    void setOrientation(std::string id, double x, double y, double z, double angle);

    /**
     * @brief Set the velocity of an object
     * @param id The ID of the object
     * @param x The velocity in x-direction
     * @param y The velocity in y-direction
     * @param z The velocity in z-direction
     *
     * The velocity is in units per second.
     */
    void setVelocity(std::string id, double x, double y, double z);

    /**
     * @brief Set the angular velocity of an object
     * @param id The ID of the object
     * @param x The rotation velocity around the x-axis
     * @param y The rotation velocity around the y-axis
     * @param z The rotation velocity around the z-axis
     */
    void setAngularVelocity(std::string id, double x, double y, double z);


    /**
     * @brief Set the angular velocity of an object
     * @param id The ID of the object
     * @param x The rotation velocity around the x-axis
     * @param y The rotation velocity around the y-axis
     * @param z The rotation velocity around the z-axis
     */
    double myTestFunction(double x, double y);

    void moveControllableEntity(std::string id, double x, double y, double z);

// ### API END ################################################################

private:
    /**
     * @brief Groups everything together that is needed to handle a near-object event
     */
    struct NearObjectHandler
    {
        NearObjectHandler(WorldEntity *entity1, WorldEntity *entity2, std::string id1, std::string id2, double distance, std::function<void (std::string, std::string)> callback)
            : entity1_(entity1), entity2_(entity2), id1_(id1), id2_(id2), distance_(distance), callback_(callback)
        {}

        WorldEntity *entity1_, *entity2_;
        std::string id1_, id2_;
        double distance_;
        std::function<void (std::string, std::string)> callback_;
    };

    /**
     * @brief Groups everything together that is needed to handle a near-poinb event
     */
    struct NearPointHandler
    {
        NearPointHandler(WorldEntity *entity, std::string id, double x, double y, double z, double distance, std::function<void (std::string)> callback)
            : entity_(entity), id_(id), point_(x, y, z), distance_(distance), callback_(callback)
        {}

        WorldEntity *entity_;
        std::string id_;
        Vector3 point_;
        double distance_;
        std::function<void (std::string)> callback_;
    };

    /**
     * @brief Groups everything together that is needed to handle an area enter/leave event
     */
    struct AreaHandler
    {
        AreaHandler(WorldEntity *entity, std::string id, double x, double y, double z, double dx, double dy, double dz, bool atEnter, std::function<void (std::string)> callback)
            : entity_(entity), id_(id), start_point_(x, y, z), atEnter_(atEnter), callback_(callback)
        { this-> end_point_ = this->start_point_ + Vector3(dx, dy, dz); }

        WorldEntity *entity_;
        std::string id_;
        Vector3 start_point_, end_point_;
        bool atEnter_;
        std::function<void (std::string)> callback_;
    };

    lua_State *lua_;
    ScriptableController *controller_;
    std::list<NearObjectHandler> nearObjectHandlers_;
    std::list<NearPointHandler> nearPointHandlers_;
    std::list<AreaHandler> areaHandlers_;
    std::map<std::string, std::list<std::function<void (std::string)> > > pawnDestroyedHandlers_;
    std::map<std::string, std::list<std::function<void (std::string, std::string, double, double)> > > pawnHitHandlers_;
    Timer periodicTimer;
    static const double periodic_interval;

    /**
     * @brief Called by ScriptableController when a pawn is killed
     * @param id The dead pawn
     *
     * Calls the lua callbacks associated with this event.
     */
    void pawnKilled(std::string id, Pawn *pawn);

    /**
     * @brief Called by ScriptableController when a Pawn is hit
     * @param target_id The hit Pawn
     * @param source_id The shooting Pawn
     * @param new_health The new health of the hit Pawn
     * @param new_shield The new shield health of the hit Pawn
     */
    void pawnHit(std::string target_id, std::string source_id, double new_health, double new_shield);

    /**
     * @brief Called every 0.5s
     *
     * This handles things that have to be checked periodically (like area events)
     * but doing this in every tick would be an overkill.
     */
    void periodic(void);
};

}

#endif // SCRIPTABLE_CONTROLLER_API_H