/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Damian 'Mozork' Frick
 *   Co-authors:
 *      ...
 *
 */

/**
    @file QuestManager.cc
    @brief Implementation of the QuestManager class.
*/

#include "QuestManager.h"

#include "util/Exception.h"
#include "util/OrxAssert.h"
#include "core/singleton/ScopedSingletonIncludes.h"
#include "core/command/ConsoleCommand.h"
#include "core/GUIManager.h"
#include "core/LuaState.h"

#include "infos/PlayerInfo.h"

#include "Quest.h"
#include "QuestHint.h"
#include "QuestItem.h"

namespace orxonox
{
    ManageScopedSingleton(QuestManager, ScopeID::ROOT, false);

    /**
    @brief
        Constructor. Registers the object.
    @todo
        Is inheriting from BaseObject proper?
    */
    QuestManager::QuestManager()
    {
        orxout(internal_info, context::quests) << "QuestManager created." << endl;
    }

    /**
    @brief
        Destructor.
    */
    QuestManager::~QuestManager()
    {
        orxout(internal_info, context::quests) << "QuestManager destroyed." << endl;
    }

    /**
    @brief
        Retreive all Quests.
    @return
        Returns a map with all Quests indexed by their id's.
    */
    std::map<std::string, Quest*> & QuestManager::getQuests(void)
    {
        return this->questMap_;
    }

    /**
    @brief
        Registers a Quest with the QuestManager to make it globally accessible.
        Uses it's id to make sure to be able to be identify and retrieve it later.
    @param quest
        The Quest that is to be registered.
    @return
        Returns true if successful, false if not.
    */
    bool QuestManager::registerQuest(Quest* quest)
    {
        if(quest == nullptr)
        {
            orxout(internal_error, context::quests) << "Quest pointer is nullptr." << endl;
            return false;
        }

        std::pair<std::map<std::string, Quest*>::iterator,bool> result;
        result = this->questMap_.insert( std::pair<std::string,Quest*>(quest->getId(),quest) ); // Inserting the Quest.

        if(result.second) // If inserting was a success.
        {
            quest->setRegistered();
            orxout(verbose, context::quests) << "Quest with questId {" << quest->getId() << "} successfully inserted." << endl;
            return true;
        }
        else
        {
           orxout(internal_warning, context::quests) << "Quest with the same id was already present." << endl;
           return false;
        }
    }

    /**
    @brief
        Unregisters a Quest in the QuestManager.
    */
    bool QuestManager::unregisterQuest(Quest* quest)
    {
        return this->questMap_.erase(quest->getId()) == 1;
    }

    /**
    @brief
        Registers a QuestHint with the QuestManager to make it globally accessible.
        Uses it's id to make sure to be able to be identify and retrieve it later.
    @param hint
        The QuestHint to be registered.
    @return
        Returns true if successful, false if not.
    */
    bool QuestManager::registerHint(QuestHint* hint)
    {
        if(hint == nullptr)
        {
            orxout(internal_error, context::quests) << "Quest pointer is nullptr." << endl;
            return false;
        }

        std::pair<std::map<std::string, QuestHint*>::iterator,bool> result;
        result = this->hintMap_.insert ( std::pair<std::string,QuestHint*>(hint->getId(),hint) ); // Inserting the QuestHSint.

        if(result.second) // If inserting was a success.
        {
            hint->setRegistered();
            orxout(verbose, context::quests) << "QuestHint with hintId {" << hint->getId() << "} successfully inserted." << endl;
            return true;
        }
        else
        {
           orxout(internal_warning, context::quests) << "QuestHint with the same id was already present." << endl;
           return false;
        }
    }

    /**
    @brief
        Unregisters a QuestHint in the QuestManager.
    */
    bool QuestManager::unregisterHint(QuestHint* hint)
    {
        return this->hintMap_.erase(hint->getId()) == 1;
    }

    /**
    @brief
        Finds a Quest with the given id.
    @param questId
        The id of the Quest sought for.
    @return
        Returns a pointer to the Quest with the input id.
        Returns nullptr if there is no Quest with the given questId.
    @throws
        Throws an exception if the given questId is invalid.
    */
    Quest* QuestManager::findQuest(const std::string & questId)
    {
        if(questId == "") // Check for validity of the given id.
            ThrowException(Argument, "Invalid questId.");

        Quest* quest;
        std::map<std::string, Quest*>::iterator it = this->questMap_.find(questId);
        if (it != this->questMap_.end()) // If the Quest is registered.
            quest = it->second;
        else
        {
           quest = nullptr;
           orxout(internal_warning, context::quests) << "The quest with id {" << questId << "} is nowhere to be found." << endl;
        }

        return quest;
    }

    /**
    @brief
        Finds a QuestHint with the given id.
    @param hintId
        The id of the QuestHint sought for.
    @return
        Returns a pointer to the QuestHint with the input id.
        Returns nullptr if there is no QuestHint with the given hintId.
    @throws
        Throws an exception if the given hintId is invalid.
    */
    QuestHint* QuestManager::findHint(const std::string & hintId)
    {
        if(hintId == "") // Check for validity of the given id.
            ThrowException(Argument, "Invalid hintId.");

        QuestHint* hint;
        std::map<std::string, QuestHint*>::iterator it = this->hintMap_.find(hintId);
        if (it != this->hintMap_.end()) // If the QuestHint is registered.
            hint = it->second;
        else
        {
           hint = nullptr;
           orxout(internal_warning, context::quests) << "The hint with id {" << hintId << "} is nowhere to be found." << endl;
        }

        return hint;
    }

    /**
    @brief
        Get the number of Quests the input player has, that are root quests.
    @param player
        The player.
    @return
        Returns the number of Quests the input player has, that are root quests.
    */
    int QuestManager::getNumRootQuests(PlayerInfo* player)
    {
        int numQuests = 0;
        for(std::map<std::string, Quest*>::iterator it = this->questMap_.begin(); it != this->questMap_.end(); it++)
        {
            if(it->second->getParentQuest() == nullptr && !it->second->isInactive(player))
                numQuests++;
        }
        return numQuests;
    }

    /**
    @brief
        Get the index-th root quest of the input player.
    @param player
        The player.
    @param index
        The index of the root quest.
    @return
        Returns the index-th root quest of the input player.
    */
    Quest* QuestManager::getRootQuest(PlayerInfo* player, int index)
    {
        for(std::map<std::string, Quest*>::iterator it = this->questMap_.begin(); it != this->questMap_.end(); it++)
        {
            if(it->second->getParentQuest() == nullptr && !it->second->isInactive(player) && index-- == 0)
                return it->second;
        }
        return nullptr;
    }

    /**
    @brief
        Get the number of sub-quest of an input Quest for the input player.
    @param quest
        The quest to get the sub-quests of.
    @param player
        The player.
    @return
        Returns the number of sub-quest of an input Quest for the input player.
    */
    int QuestManager::getNumSubQuests(Quest* quest, PlayerInfo* player)
    {
        if(quest == nullptr)
            return this->getNumRootQuests(player);

        std::list<Quest*> quests = quest->getSubQuestList();
        int numQuests = 0;
        for(std::list<Quest*>::iterator it = quests.begin(); it != quests.end(); it++)
        {
            if(!(*it)->isInactive(player))
                numQuests++;
        }
        return numQuests;
    }

    /**
    @brief
        Get the index-th sub-quest of the input Quest for the input player.
    @param quest
        The Quest to get the sub-quest of.
    @param player
        The player.
    @param index
        The index of the sub-quest.
    */
    Quest* QuestManager::getSubQuest(Quest* quest, PlayerInfo* player, int index)
    {
        if(quest == nullptr)
            return this->getRootQuest(player, index);

        std::list<Quest*> quests = quest->getSubQuestList();
        for(std::list<Quest*>::iterator it = quests.begin(); it != quests.end(); it++)
        {
            if(!(*it)->isInactive(player) && index-- == 0)
                return *it;
        }
        return nullptr;
    }

    /**
    @brief
        Get the number of QuestHints of the input Quest for the input player.
    @param quest
        The quest to get the hints of.
    @param player
        The player.
    @return
        Returns the number of QuestHints of the input Quest for the input player.
    */
    int QuestManager::getNumHints(Quest* quest, PlayerInfo* player)
    {
        std::list<QuestHint*> hints = quest->getHintsList();
        int numHints = 0;
        for(std::list<QuestHint*>::iterator it = hints.begin(); it != hints.end(); it++)
        {
            if((*it)->isActive(player))
                numHints++;
        }
        return numHints;
    }

    /**
    @brief
        Get the index-th QuestHint of the input Quest for the input player.
    @param quest
        The Quest to get the QuestHint of.
    @param player
        The player.
    @param index
        The index of the QuestHint.
    @return
        Returns a pointer to the index-th QuestHint of the input Quest for the input player.
    */
    QuestHint* QuestManager::getHints(Quest* quest, PlayerInfo* player, int index)
    {
        std::list<QuestHint*> hints = quest->getHintsList();
        for(std::list<QuestHint*>::iterator it = hints.begin(); it != hints.end(); it++)
        {
            if((*it)->isActive(player) && index-- == 0)
                return *it;
        }
        return nullptr;
    }

    /**
    @brief
        Get the parent-quest of the input Quest.
    @param quest
        The Quest to get the parent-quest of.
    @return
        Returns a pointer to the parent-quest of the input Quest.
    */
    Quest* QuestManager::getParentQuest(Quest* quest)
    {
        OrxAssert(quest, "The input Quest is nullptr.");
        return quest->getParentQuest();
    }

    /**
    @brief
        Get the QuestDescription of the input Quest.
    @param item
        The Quest to get the QuestDescription of.
    @return
        Return a pointer ot the QuestDescription of the input Quest.
    */
    QuestDescription* QuestManager::getDescription(Quest* item)
    {
        OrxAssert(item, "The input Quest is nullptr.");
        return item->getDescription();
    }

    /**
    @brief
        Get the QuestDescription of the input QuestHint.
    @param item
        The QuestHint to get the QuestDescription of.
    @return
        Returns a pointer to the QuestDescription of the input QuestHint.
    */
    QuestDescription* QuestManager::getDescription(QuestHint* item)
    {
        OrxAssert(item, "The input QuestHint is nullptr.");
        return item->getDescription();
    }

    /**
    @brief
        Get the id of the input Quest.
    @param item
        The Quest to get the id of.
    @return
        Returns the id of the input Quest.
    */
    const std::string QuestManager::getId(Quest* item) const
    {
        OrxAssert(item, "The input Quest is nullptr.");
        return item->getId();
    }

    /**
    @brief
        Get the id of the input QuestHint.
    @param item
        The QuestHint to get the id of.
    @return
        Returns the id of the input QuestHint.
    */
    const std::string QuestManager::getId(QuestHint* item) const
    {
        OrxAssert(item, "The input QuestHint is nullptr.");
        return item->getId();
    }

    /**
    @brief
        Retrieve the player for a certain GUI.
    @param guiName
        The name of the GUI the player is retrieved for.
    @return
        Returns the player.
    @todo
        This very well might be outdated. So: Check if still needed, and update if necessary.
    */
    PlayerInfo* QuestManager::retrievePlayer(const std::string & guiName)
    {
        PlayerInfo* player = GUIManager::getInstance().getPlayer(guiName);
        if(player == nullptr)
        {
            orxout(internal_error, context::quests) << "GUIOverlay with name '" << guiName << "' has no player." << endl;
            return nullptr;
        }

        return player;
    }

}