/*
 * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: http://github.com/azerothcore/azerothcore-wotlk/LICENSE-GPL2
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 */

#ifndef __EVENTPROCESSOR_H
#define __EVENTPROCESSOR_H

#include "Define.h"

#include <map>

// Note. All times are in milliseconds here.

class BasicEvent
{
    public:
        BasicEvent()
        {
            to_Abort = false;
            m_addTime = 0;
            m_execTime = 0;
        }
        virtual ~BasicEvent() { }                           // override destructor to perform some actions on event removal

        // this method executes when the event is triggered
        // return false if event does not want to be deleted
        // e_time is execution time, p_time is update interval
        virtual bool Execute(uint64 /*e_time*/, uint32 /*p_time*/) { return true; }

        virtual bool IsDeletable() const { return true; }   // this event can be safely deleted

        virtual void Abort(uint64 /*e_time*/) { }           // this method executes when the event is aborted

        bool to_Abort;                                      // set by externals when the event is aborted, aborted events don't execute
        // and get Abort call when deleted

        // these can be used for time offset control
        uint64 m_addTime;                                   // time when the event was added to queue, filled by event handler
        uint64 m_execTime;                                  // planned time of next execution, filled by event handler
};

typedef std::multimap<uint64, BasicEvent*> EventList;

class EventProcessor
{
    public:
        EventProcessor();
        ~EventProcessor();

        void Update(uint32 p_time);
        void KillAllEvents(bool force);
        void AddEvent(BasicEvent* Event, uint64 e_time, bool set_addtime = true);
        uint64 CalculateTime(uint64 t_offset) const;

        // Xinef: calculates next queue tick time
        uint64 CalculateQueueTime(uint64 delay) const;

    protected:
        uint64 m_time;
        EventList m_events;
        bool m_aborting;
};
#endif
