/*
 * This file is part of the AzerothCore 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/>.
 */

#include "DisableMgr.h"
#include "GameEventMgr.h"
#include "MMapFactory.h"
#include "ObjectMgr.h"
#include "OutdoorPvP.h"
#include "Player.h"
#include "SpellInfo.h"
#include "SpellMgr.h"
#include "StringConvert.h"
#include "Tokenize.h"
#include "VMapMgr2.h"
#include "World.h"

DisableMgr::DisableMap DisableMgr::m_DisableMap;

DisableMgr::DisableMgr() {}
DisableMgr::~DisableMgr() {}

DisableMgr* DisableMgr::instance()
{
    static DisableMgr instance;
    return &instance;
}

void DisableMgr::LoadDisables()
{
    uint32 oldMSTime = getMSTime();

    // reload case
    for (DisableTypeMap& disableTypeMap : m_DisableMap)
        disableTypeMap.clear();

    QueryResult result = WorldDatabase.Query("SELECT sourceType, entry, flags, params_0, params_1 FROM disables");

    uint32 total_count = 0;

    if (!result)
    {
        LOG_WARN("server.loading", ">> Loaded 0 disables. DB table `disables` is empty!");
        LOG_INFO("server.loading", " ");
        return;
    }

    Field* fields;
    do
    {
        fields = result->Fetch();
        DisableType type = DisableType(fields[0].Get<uint32>());
        if (type >= MAX_DISABLE_TYPES)
        {
            LOG_ERROR("sql.sql", "Invalid type {} specified in `disables` table, skipped.", type);
            continue;
        }

        uint32 entry = fields[1].Get<uint32>();
        uint8 flags = fields[2].Get<uint8>();
        std::string params_0 = fields[3].Get<std::string>();
        std::string params_1 = fields[4].Get<std::string>();

        DisableData data;
        data.flags = flags;

        if (!HandleDisableType(type, entry, flags, params_0, params_1, data))
            continue;

        m_DisableMap[type].insert(DisableTypeMap::value_type(entry, data));
        ++total_count;
    } while (result->NextRow());

    LOG_INFO("server.loading", ">> Loaded {} Disables in {} ms", total_count, GetMSTimeDiffToNow(oldMSTime));
    LOG_INFO("server.loading", " ");
}

/**
* @brief Allow to add disables without adding it to the database. Useful for modules.
*
* @param type Disable type
* @param entry Entry of Spell/Quest/Map/BG/Achievement/Map/GameEvent/Item
* @param flags Flag depending on Type
* @param param0 MapId if DISABLE_TYPE_SPELL used, 0 for all maps.
* @param param1 AreaId if DISABLE_TYPE_SPELL used, 0 for all areas.
*/
void DisableMgr::AddDisable(DisableType type, uint32 entry, uint8 flags, std::string const& param0, std::string const& param1)
{
    if (type >= MAX_DISABLE_TYPES)
    {
        LOG_ERROR("disables", "AddDisable: Invalid type {} specified for entry {}, skipped.", type);
        return;
    }

    DisableData data;
    data.flags = flags;

    if (!HandleDisableType(type, entry, flags, param0, param1, data))
        return;

    m_DisableMap[type].insert(DisableTypeMap::value_type(entry, data));
}

bool DisableMgr::HandleDisableType(DisableType type, uint32 entry, uint8 flags, std::string const& params_0, std::string const& params_1, DisableData& data)
{
    switch (type)
    {
    case DISABLE_TYPE_GO_LOS:
        if (!sObjectMgr->GetGameObjectTemplate(entry))
        {
            LOG_ERROR("sql.sql", "Gameobject entry {} from `disables` doesn't exist in dbc, skipped.", entry);
            return false;
        }
        if (flags)
            LOG_ERROR("sql.sql", "Disable flags specified for gameobject {}, useless data.", entry);
        break;
    case DISABLE_TYPE_SPELL:
        if (!(sSpellMgr->GetSpellInfo(entry) || flags & SPELL_DISABLE_DEPRECATED_SPELL))
        {
            LOG_ERROR("sql.sql", "Spell entry {} from `disables` doesn't exist in dbc, skipped.", entry);
            return false;
        }

        if (!flags || flags > MAX_SPELL_DISABLE_TYPE)
        {
            LOG_ERROR("sql.sql", "Disable flags for spell {} are invalid, skipped.", entry);
            return false;
        }

        if (flags & SPELL_DISABLE_MAP)
        {
            for (std::string_view mapStr : Acore::Tokenize(params_0, ',', true))
            {
                if (Optional<uint32> mapId = Acore::StringTo<uint32>(mapStr))
                    data.params[0].insert(*mapId);
                else
                    LOG_ERROR("sql.sql", "Disable map '{}' for spell {} is invalid, skipped.", mapStr, entry);
            }
        }

        if (flags & SPELL_DISABLE_AREA)
        {
            for (std::string_view areaStr : Acore::Tokenize(params_1, ',', true))
            {
                if (Optional<uint32> areaId = Acore::StringTo<uint32>(areaStr))
                    data.params[1].insert(*areaId);
                else
                    LOG_ERROR("sql.sql", "Disable area '{}' for spell {} is invalid, skipped.", areaStr, entry);
            }
        }

        // xinef: if spell has disabled los, add flag
        if (flags & SPELL_DISABLE_LOS)
        {
            SpellInfo* spellInfo = const_cast<SpellInfo*>(sSpellMgr->GetSpellInfo(entry));
            spellInfo->AttributesEx2 |= SPELL_ATTR2_IGNORE_LINE_OF_SIGHT;
        }

        break;
        // checked later
    case DISABLE_TYPE_QUEST:
        break;
    case DISABLE_TYPE_MAP:
    case DISABLE_TYPE_LFG_MAP:
    {
        MapEntry const* mapEntry = sMapStore.LookupEntry(entry);
        if (!mapEntry)
        {
            LOG_ERROR("sql.sql", "Map entry {} from `disables` doesn't exist in dbc, skipped.", entry);
            return false;
        }
        bool isFlagInvalid = false;
        switch (mapEntry->map_type)
        {
        case MAP_COMMON:
            if (flags)
                isFlagInvalid = true;
            break;
        case MAP_INSTANCE:
        case MAP_RAID:
            if (flags & DUNGEON_STATUSFLAG_HEROIC && !GetMapDifficultyData(entry, DUNGEON_DIFFICULTY_HEROIC))
                isFlagInvalid = true;
            else if (flags & RAID_STATUSFLAG_10MAN_HEROIC && !GetMapDifficultyData(entry, RAID_DIFFICULTY_10MAN_HEROIC))
                isFlagInvalid = true;
            else if (flags & RAID_STATUSFLAG_25MAN_HEROIC && !GetMapDifficultyData(entry, RAID_DIFFICULTY_25MAN_HEROIC))
                isFlagInvalid = true;
            break;
        case MAP_BATTLEGROUND:
        case MAP_ARENA:
            LOG_ERROR("sql.sql", "Battleground map {} specified to be disabled in map case, skipped.", entry);
            return false;
        }
        if (isFlagInvalid)
        {
            LOG_ERROR("sql.sql", "Disable flags for map {} are invalid, skipped.", entry);
            return false;
        }
        break;
    }
    case DISABLE_TYPE_BATTLEGROUND:
        if (!sBattlemasterListStore.LookupEntry(entry))
        {
            LOG_ERROR("sql.sql", "Battleground entry {} from `disables` doesn't exist in dbc, skipped.", entry);
            return false;
        }
        if (flags)
            LOG_ERROR("sql.sql", "Disable flags specified for battleground {}, useless data.", entry);
        break;
    case DISABLE_TYPE_OUTDOORPVP:
        if (entry > MAX_OUTDOORPVP_TYPES)
        {
            LOG_ERROR("sql.sql", "OutdoorPvPTypes value {} from `disables` is invalid, skipped.", entry);
            return false;
        }
        if (flags)
            LOG_ERROR("sql.sql", "Disable flags specified for outdoor PvP {}, useless data.", entry);
        break;
    case DISABLE_TYPE_ACHIEVEMENT_CRITERIA:
        if (!sAchievementCriteriaStore.LookupEntry(entry))
        {
            LOG_ERROR("sql.sql", "Achievement Criteria entry {} from `disables` doesn't exist in dbc, skipped.", entry);
            return false;
        }
        if (flags)
            LOG_ERROR("sql.sql", "Disable flags specified for Achievement Criteria {}, useless data.", entry);
        break;
    case DISABLE_TYPE_VMAP:
    {
        MapEntry const* mapEntry = sMapStore.LookupEntry(entry);
        if (!mapEntry)
        {
            LOG_ERROR("sql.sql", "Map entry {} from `disables` doesn't exist in dbc, skipped.", entry);
            return false;
        }
        switch (mapEntry->map_type)
        {
        case MAP_COMMON:
            if (flags & VMAP::VMAP_DISABLE_AREAFLAG)
                LOG_INFO("disable", "Areaflag disabled for world map {}.", entry);
            if (flags & VMAP::VMAP_DISABLE_LIQUIDSTATUS)
                LOG_INFO("disable", "Liquid status disabled for world map {}.", entry);
            break;
        case MAP_INSTANCE:
        case MAP_RAID:
            if (flags & VMAP::VMAP_DISABLE_HEIGHT)
                LOG_INFO("disable", "Height disabled for instance map {}.", entry);
            if (flags & VMAP::VMAP_DISABLE_LOS)
                LOG_INFO("disable", "LoS disabled for instance map {}.", entry);
            break;
        case MAP_BATTLEGROUND:
            if (flags & VMAP::VMAP_DISABLE_HEIGHT)
                LOG_INFO("disable", "Height disabled for battleground map {}.", entry);
            if (flags & VMAP::VMAP_DISABLE_LOS)
                LOG_INFO("disable", "LoS disabled for battleground map {}.", entry);
            break;
        case MAP_ARENA:
            if (flags & VMAP::VMAP_DISABLE_HEIGHT)
                LOG_INFO("disable", "Height disabled for arena map {}.", entry);
            if (flags & VMAP::VMAP_DISABLE_LOS)
                LOG_INFO("disable", "LoS disabled for arena map {}.", entry);
            break;
        default:
            break;
        }
        break;
    }
    case DISABLE_TYPE_GAME_EVENT:
    {
        GameEventMgr::ActiveEvents const& activeEvents = sGameEventMgr->GetActiveEventList();
        if (activeEvents.find(entry) != activeEvents.end())
        {
            sGameEventMgr->StopEvent(entry);
            LOG_INFO("disable", "Event entry {} was stopped because it has been disabled.", entry);
        }
        break;
    }
    case DISABLE_TYPE_LOOT:
        break;
    case MAX_DISABLE_TYPES:
    {
        LOG_ERROR("disable", "SourceType out of range for entry {}, skipped", entry);
        return false;
    }
    default:
        return false;
    }
    return true;
}

void DisableMgr::CheckQuestDisables()
{
    uint32 oldMSTime = getMSTime();

    uint32 count = m_DisableMap[DISABLE_TYPE_QUEST].size();
    if (!count)
    {
        LOG_INFO("server.loading", ">> Checked 0 quest disables.");
        LOG_INFO("server.loading", " ");
        return;
    }

    // check only quests, rest already done at startup
    for (DisableTypeMap::iterator itr = m_DisableMap[DISABLE_TYPE_QUEST].begin(); itr != m_DisableMap[DISABLE_TYPE_QUEST].end();)
    {
        const uint32 entry = itr->first;
        if (!sObjectMgr->GetQuestTemplate(entry))
        {
            LOG_ERROR("sql.sql", "Quest entry {} from `disables` doesn't exist, skipped.", entry);
            m_DisableMap[DISABLE_TYPE_QUEST].erase(itr++);
            continue;
        }
        if (itr->second.flags)
            LOG_ERROR("sql.sql", "Disable flags specified for quest {}, useless data.", entry);
        ++itr;
    }

    LOG_INFO("server.loading", ">> Checked {} Quest Disables in {} ms", count, GetMSTimeDiffToNow(oldMSTime));
    LOG_INFO("server.loading", " ");
}

bool DisableMgr::IsDisabledFor(DisableType type, uint32 entry, Unit const* unit, uint8 flags)
{
    if (type >= MAX_DISABLE_TYPES)
    {
        LOG_ERROR("server", "Disables::IsDisabledFor() called with unknown disable type {}!  (entry {}, flags {}).", type, entry, flags);
        return false;
    }

    if (m_DisableMap[type].empty())
        return false;

    DisableTypeMap::iterator itr = m_DisableMap[type].find(entry);
    if (itr == m_DisableMap[type].end())    // not disabled
        return false;

    switch (type)
    {
        case DISABLE_TYPE_SPELL:
            {
                uint8 spellFlags = itr->second.flags;
                if (unit)
                {
                    if ((spellFlags & SPELL_DISABLE_PLAYER && unit->IsPlayer()) ||
                            (unit->IsCreature() && ((unit->IsPet() && spellFlags & SPELL_DISABLE_PET) || spellFlags & SPELL_DISABLE_CREATURE)))
                    {
                        if (spellFlags & SPELL_DISABLE_MAP)
                        {
                            std::set<uint32> const& mapIds = itr->second.params[0];
                            if (mapIds.find(unit->GetMapId()) != mapIds.end())
                                return true;                                        // Spell is disabled on current map

                            if (!(spellFlags & SPELL_DISABLE_AREA))
                                return false;                                       // Spell is disabled on another map, but not this one, return false

                            // Spell is disabled in an area, but not explicitly our current mapId. Continue processing.
                        }

                        if (spellFlags & SPELL_DISABLE_AREA)
                        {
                            std::set<uint32> const& areaIds = itr->second.params[1];
                            if (areaIds.find(unit->GetAreaId()) != areaIds.end())
                                return true;                                        // Spell is disabled in this area
                            return false;                                           // Spell is disabled in another area, but not this one, return false
                        }
                        else
                            return true;                                            // Spell disabled for all maps
                    }

                    return false;
                }
                else if (spellFlags & SPELL_DISABLE_DEPRECATED_SPELL)    // call not from spellcast
                    return true;

                break;
            }
        case DISABLE_TYPE_MAP:
        case DISABLE_TYPE_LFG_MAP:
            if (Player const* player = unit->ToPlayer())
            {
                MapEntry const* mapEntry = sMapStore.LookupEntry(entry);
                if (mapEntry->IsDungeon())
                {
                    uint8 disabledModes = itr->second.flags;
                    Difficulty targetDifficulty = player->GetDifficulty(mapEntry->IsRaid());
                    GetDownscaledMapDifficultyData(entry, targetDifficulty);
                    switch (targetDifficulty)
                    {
                        case DUNGEON_DIFFICULTY_NORMAL:
                            return disabledModes & DUNGEON_STATUSFLAG_NORMAL;
                        case DUNGEON_DIFFICULTY_HEROIC:
                            return disabledModes & DUNGEON_STATUSFLAG_HEROIC;
                        case RAID_DIFFICULTY_10MAN_HEROIC:
                            return disabledModes & RAID_STATUSFLAG_10MAN_HEROIC;
                        case RAID_DIFFICULTY_25MAN_HEROIC:
                            return disabledModes & RAID_STATUSFLAG_25MAN_HEROIC;
                    }
                }
                else if (mapEntry->map_type == MAP_COMMON)
                    return true;
            }
            return false;
        case DISABLE_TYPE_VMAP:
            return flags & itr->second.flags;
        case DISABLE_TYPE_QUEST:
        case DISABLE_TYPE_BATTLEGROUND:
        case DISABLE_TYPE_OUTDOORPVP:
        case DISABLE_TYPE_ACHIEVEMENT_CRITERIA:
        case DISABLE_TYPE_GO_LOS:
        case DISABLE_TYPE_GAME_EVENT:
        case DISABLE_TYPE_LOOT:
            return true;
        default:
            break;
    }

    return false;
}

bool DisableMgr::IsVMAPDisabledFor(uint32 entry, uint8 flags)
{
    return IsDisabledFor(DISABLE_TYPE_VMAP, entry, nullptr, flags);
}

bool DisableMgr::IsPathfindingEnabled(Map const* map)
{
    if (!map)
        return false;

    return !MMAP::MMapFactory::forbiddenMaps[map->GetId()] && (sWorld->getBoolConfig(CONFIG_ENABLE_MMAPS) ? true : map->IsBattlegroundOrArena());
}