/*
 * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 */

#ifndef ACORE_WAYPOINTMOVEMENTGENERATOR_H
#define ACORE_WAYPOINTMOVEMENTGENERATOR_H

/** @page PathMovementGenerator is used to generate movements
 * of waypoints and flight paths.  Each serves the purpose
 * of generate activities so that it generates updated
 * packets for the players.
 */

#include "MovementGenerator.h"
#include "Player.h"
#include "WaypointManager.h"

#define FLIGHT_TRAVEL_UPDATE  100
#define TIMEDIFF_NEXT_WP      250

template<class T, class P>
class PathMovementBase
{
public:
    PathMovementBase() : i_path(), i_currentNode(0) {}
    PathMovementBase(P path) : i_path(path), i_currentNode(0) {}
    virtual ~PathMovementBase() {};

    uint32 GetCurrentNode() const { return i_currentNode; }

protected:
    P i_path;
    uint32 i_currentNode;
};

template<class T>
class WaypointMovementGenerator;

template<>
class WaypointMovementGenerator<Creature> : public MovementGeneratorMedium< Creature, WaypointMovementGenerator<Creature> >,
    public PathMovementBase<Creature, WaypointPath const*>
{
public:
    WaypointMovementGenerator(uint32 _path_id = 0, bool _repeating = true)
        : PathMovementBase((WaypointPath const*)nullptr), i_nextMoveTime(0), m_isArrivalDone(false), path_id(_path_id), repeating(_repeating)  {}
    ~WaypointMovementGenerator() { i_path = nullptr; }
    void DoInitialize(Creature*);
    void DoFinalize(Creature*);
    void DoReset(Creature*);
    bool DoUpdate(Creature*, uint32 diff);

    void MovementInform(Creature*);

    MovementGeneratorType GetMovementGeneratorType() { return WAYPOINT_MOTION_TYPE; }

    // now path movement implmementation
    void LoadPath(Creature*);

private:
    void Stop(int32 time) { i_nextMoveTime.Reset(time);}

    bool Stopped() { return !i_nextMoveTime.Passed();}

    bool CanMove(int32 diff)
    {
        i_nextMoveTime.Update(diff);
        return i_nextMoveTime.Passed();
    }

    void OnArrived(Creature*);
    bool StartMove(Creature*);

    void StartMoveNow(Creature* creature)
    {
        i_nextMoveTime.Reset(0);
        StartMove(creature);
    }

    TimeTrackerSmall i_nextMoveTime;
    bool m_isArrivalDone;
    uint32 path_id;
    bool repeating;
};

/** FlightPathMovementGenerator generates movement of the player for the paths
 * and hence generates ground and activities for the player.
 */
class FlightPathMovementGenerator : public MovementGeneratorMedium< Player, FlightPathMovementGenerator >,
    public PathMovementBase<Player, TaxiPathNodeList>
{
public:
    explicit FlightPathMovementGenerator(uint32 startNode = 0)
    {
        i_currentNode = startNode;
        _endGridX = 0.0f;
        _endGridY = 0.0f;
        _endMapId = 0;
        _preloadTargetNode = 0;
        _mapSwitch = false;
    }
    void LoadPath(Player* player);
    void DoInitialize(Player*);
    void DoReset(Player*);
    void DoFinalize(Player*);
    bool DoUpdate(Player*, uint32);
    MovementGeneratorType GetMovementGeneratorType() { return FLIGHT_MOTION_TYPE; }

    TaxiPathNodeList const& GetPath() { return i_path; }
    uint32 GetPathAtMapEnd() const;
    bool HasArrived() const { return (i_currentNode >= i_path.size()); }
    void SetCurrentNodeAfterTeleport();
    void SkipCurrentNode() { ++i_currentNode; }
    void DoEventIfAny(Player* player, TaxiPathNodeEntry const* node, bool departure);

    void InitEndGridInfo();
    void PreloadEndGrid();

private:
    float _endGridX;                //! X coord of last node location
    float _endGridY;                //! Y coord of last node location
    uint32 _endMapId;               //! map Id of last node location
    uint32 _preloadTargetNode;      //! node index where preloading starts
    bool _mapSwitch;

    std::deque<uint32> _pointsForPathSwitch;    //! node indexes and costs where TaxiPath changes
};
#endif