/*
 * Copyright (C) 2008 Trinity <http://www.trinitycore.org/>
 *
 * Thanks to the original authors: MaNGOS <http://www.mangosproject.org/>
 *
 * 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.
 *
 * 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
 */

#ifndef TRINITY_MOTIONMASTER_H
#define TRINITY_MOTIONMASTER_H

#include "Common.h"
#include <stack>

class MovementGenerator;
class Unit;

// Creature Entry ID used for waypoints show, visible only for GMs
#define VISUAL_WAYPOINT 1

// values 0 ... MAX_DB_MOTION_TYPE-1 used in DB
enum MovementGeneratorType
{
    IDLE_MOTION_TYPE      = 0,                              // IdleMovementGenerator.h
    RANDOM_MOTION_TYPE    = 1,                              // RandomMovementGenerator.h
    WAYPOINT_MOTION_TYPE  = 2,                              // WaypointMovementGenerator.h
    MAX_DB_MOTION_TYPE    = 3,                              // *** this and below motion types can't be set in DB.
    ANIMAL_RANDOM_MOTION_TYPE = MAX_DB_MOTION_TYPE,         // AnimalRandomMovementGenerator.h
    CONFUSED_MOTION_TYPE  = 4,                              // ConfusedMovementGenerator.h
    TARGETED_MOTION_TYPE  = 5,                              // TargetedMovementGenerator.h
    HOME_MOTION_TYPE      = 6,                              // HomeMovementGenerator.h
    FLIGHT_MOTION_TYPE    = 7,                              // WaypointMovementGenerator.h
    POINT_MOTION_TYPE     = 8,                              // PointMovementGenerator.h
    FLEEING_MOTION_TYPE   = 9,                              // FleeingMovementGenerator.h
    DISTRACT_MOTION_TYPE  = 10,                             // IdleMovementGenerator.h
};

class TRINITY_DLL_SPEC MotionMaster : private std::stack<MovementGenerator *>
{
    private:
        typedef std::stack<MovementGenerator *> Impl;
    public:

        explicit MotionMaster(Unit *unit) : i_owner(unit) {}
        ~MotionMaster();

        void Initialize();

        MovementGenerator* operator->(void) { return top(); }

        using Impl::top;
        using Impl::empty;

        typedef Impl::container_type::const_iterator const_iterator;
        const_iterator begin() const { return Impl::c.begin(); }
        const_iterator end() const { return Impl::c.end(); }

        void UpdateMotion(const uint32 &diff);
        void Clear(bool reset = true);
        void MovementExpired(bool reset = true);

        void MoveIdle();
        void MoveTargetedHome();
        void MoveFollow(Unit* target, float dist, float angle);
        void MoveChase(Unit* target, float dist = 0.0f, float angle = 0.0f);
        void MoveConfused();
        void MoveFleeing(Unit* enemy);
        void MovePoint(uint32 id, float x,float y,float z);
        void MoveTaxiFlight(uint32 path, uint32 pathnode);
        void MoveDistract(uint32 time);

        MovementGeneratorType GetCurrentMovementGeneratorType() const;

        void propagateSpeedChange();

        bool GetDestination(float &x, float &y, float &z);
    private:
        void Mutate(MovementGenerator *m);                  // use Move* functions instead

        Unit *i_owner;
};
#endif
