/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef _LFGQUEUE_H
#define _LFGQUEUE_H

#include "LFG.h"
#include <list>

namespace lfg
{

enum LfgCompatibility
{
    LFG_COMPATIBILITY_PENDING,
    LFG_INCOMPATIBLES_WRONG_GROUP_SIZE,
    LFG_INCOMPATIBLES_TOO_MUCH_PLAYERS,
    LFG_INCOMPATIBLES_MULTIPLE_LFG_GROUPS,
    LFG_INCOMPATIBLES_HAS_IGNORES,
    LFG_INCOMPATIBLES_NO_ROLES,
    LFG_INCOMPATIBLES_NO_DUNGEONS,
    LFG_COMPATIBLES_WITH_LESS_PLAYERS,                     // Values under this = not compatible (do not modify order)
    LFG_COMPATIBLES_BAD_STATES,
    LFG_COMPATIBLES_MATCH                                  // Must be the last one
};

struct LfgCompatibilityData
{
    LfgCompatibilityData(): compatibility(LFG_COMPATIBILITY_PENDING) { }
    LfgCompatibilityData(LfgCompatibility _compatibility): compatibility(_compatibility) { }
    LfgCompatibilityData(LfgCompatibility _compatibility, LfgRolesMap const& _roles):
        compatibility(_compatibility), roles(_roles) { }

    LfgCompatibility compatibility;
    LfgRolesMap roles;
};

/// Stores player or group queue info
struct LfgQueueData
{
    LfgQueueData();

    LfgQueueData(time_t _joinTime, LfgDungeonSet const& _dungeons, LfgRolesMap const& _roles):
        joinTime(_joinTime), tanks(LFG_TANKS_NEEDED), healers(LFG_HEALERS_NEEDED),
        dps(LFG_DPS_NEEDED), dungeons(_dungeons), roles(_roles)
        { }

    time_t joinTime;                                       ///< Player queue join time (to calculate wait times)
    uint8 tanks;                                           ///< Tanks needed
    uint8 healers;                                         ///< Healers needed
    uint8 dps;                                             ///< Dps needed
    LfgDungeonSet dungeons;                                ///< Selected Player/Group Dungeon/s
    LfgRolesMap roles;                                     ///< Selected Player Role/s
    std::string bestCompatible;                            ///< Best compatible combination of people queued
};

struct LfgWaitTime
{
    LfgWaitTime(): time(-1), number(0) { }
    int32 time;                                            ///< Wait time
    uint32 number;                                         ///< Number of people used to get that wait time
};

typedef std::map<uint32, LfgWaitTime> LfgWaitTimesContainer;
typedef std::map<std::string, LfgCompatibilityData> LfgCompatibleContainer;
typedef std::map<ObjectGuid, LfgQueueData> LfgQueueDataContainer;

/**
    Stores all data related to queue
*/
class TC_GAME_API LFGQueue
{
    public:
        LFGQueue();
        LFGQueue(LFGQueue const&) = delete;
        LFGQueue(LFGQueue&& other) noexcept;
        LFGQueue& operator=(LFGQueue const&) = delete;
        LFGQueue& operator=(LFGQueue&& right) noexcept;
        ~LFGQueue();

        // Add/Remove from queue
        std::string GetDetailedMatchRoles(GuidList const& check) const;
        void AddToQueue(ObjectGuid guid, bool reAdd = false);
        void RemoveFromQueue(ObjectGuid guid);
        void AddQueueData(ObjectGuid guid, time_t joinTime, LfgDungeonSet const& dungeons, LfgRolesMap const& rolesMap);
        void RemoveQueueData(ObjectGuid guid);

        // Update Timers (when proposal success)
        void UpdateWaitTimeAvg(int32 waitTime, uint32 dungeonId);
        void UpdateWaitTimeTank(int32 waitTime, uint32 dungeonId);
        void UpdateWaitTimeHealer(int32 waitTime, uint32 dungeonId);
        void UpdateWaitTimeDps(int32 waitTime, uint32 dungeonId);

        // Update Queue timers
        void UpdateQueueTimers(uint8 queueId, time_t currTime);
        time_t GetJoinTime(ObjectGuid guid) const;

        // Find new group
        uint8 FindGroups();

        // Just for debugging purposes
        std::string DumpQueueInfo() const;
        std::string DumpCompatibleInfo(bool full = false) const;

    private:
        void AddToNewQueue(ObjectGuid guid);
        void AddToCurrentQueue(ObjectGuid guid);
        void AddToFrontCurrentQueue(ObjectGuid guid);
        void RemoveFromNewQueue(ObjectGuid guid);
        void RemoveFromCurrentQueue(ObjectGuid guid);

        void SetCompatibles(std::string const& key, LfgCompatibility compatibles);
        LfgCompatibility GetCompatibles(std::string const& key);
        void RemoveFromCompatibles(ObjectGuid guid);

        void SetCompatibilityData(std::string const& key, LfgCompatibilityData const& compatibles);
        LfgCompatibilityData* GetCompatibilityData(std::string const& key);
        void FindBestCompatibleInQueue(LfgQueueDataContainer::iterator itrQueue);
        void UpdateBestCompatibleInQueue(LfgQueueDataContainer::iterator itrQueue, std::string const& key, LfgRolesMap const& roles);

        LfgCompatibility FindNewGroups(GuidList& check, GuidList& all);
        LfgCompatibility CheckCompatibility(GuidList check);

        // Queue
        LfgQueueDataContainer QueueDataStore;              ///< Queued groups
        LfgCompatibleContainer CompatibleMapStore;         ///< Compatible dungeons

        LfgWaitTimesContainer waitTimesAvgStore;           ///< Average wait time to find a group queuing as multiple roles
        LfgWaitTimesContainer waitTimesTankStore;          ///< Average wait time to find a group queuing as tank
        LfgWaitTimesContainer waitTimesHealerStore;        ///< Average wait time to find a group queuing as healer
        LfgWaitTimesContainer waitTimesDpsStore;           ///< Average wait time to find a group queuing as dps
        GuidList currentQueueStore;                        ///< Ordered list. Used to find groups
        GuidList newToQueueStore;                          ///< New groups to add to queue
};

} // namespace lfg

#endif