/*
 *  The ManaPlus Client
 *  Copyright (C) 2008-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011  The ManaPlus Developers
 *
 *  This file is part of The ManaPlus Client.
 *
 *  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
 *  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 PLAYER_RELATIONS_H
#define PLAYER_RELATIONS_H

#include <list>
#include <map>
#include <string>
#include <vector>

#ifdef __GNUC__
#define A_UNUSED  __attribute__ ((unused))
#else
#define A_UNUSED
#endif

class Being;

struct PlayerRelation
{
    static const unsigned int EMOTE        = (1 << 0);
    static const unsigned int SPEECH_FLOAT = (1 << 1);
    static const unsigned int SPEECH_LOG   = (1 << 2);
    static const unsigned int WHISPER      = (1 << 3);
    static const unsigned int TRADE        = (1 << 4);
    static const unsigned int INVISIBLE    = (1 << 5);
    static const unsigned int BLACKLIST    = (1 << 6);
    static const unsigned int ENEMY        = (1 << 7);

    static const unsigned int RELATIONS_NR = 7;
    static const unsigned int RELATION_PERMISSIONS[RELATIONS_NR];

    static const unsigned int DEFAULT = EMOTE
                                      | SPEECH_FLOAT
                                      | SPEECH_LOG
                                      | WHISPER
                                      | TRADE;
    enum Relation
    {
        NEUTRAL     = 0,
        FRIEND      = 1,
        DISREGARDED = 2,
        IGNORED     = 3,
        ERASED      = 4,
        BLACKLISTED = 5,
        ENEMY2      = 6
    };

    PlayerRelation(Relation relation);

    Relation mRelation; // bitmask for all of the above
};


/**
 * Ignore strategy: describes how we should handle ignores.
 */
class PlayerIgnoreStrategy
{
    public:
        std::string mDescription;
        std::string mShortName;

        virtual ~PlayerIgnoreStrategy()
        { }

        /**
         * Handle the ignoring of the indicated action by the indicated player.
         */
        virtual void ignore(Being *being, unsigned int flags) = 0;
};

class PlayerRelationsListener
{
    public:
        PlayerRelationsListener()
        { }

        virtual ~PlayerRelationsListener()
        { }

        virtual void updatedPlayer(const std::string &name) = 0;
        virtual void updateAll() = 0;
};

/**
 * Player relations class, represents any particular relations and/or
 * preferences the user of the local client has wrt other players (identified
 * by std::string).
 */
class PlayerRelationsManager
{
    public:
        PlayerRelationsManager();
        ~PlayerRelationsManager();

        /**
         * Initialise player relations manager (load config file etc.)
         */
        void init();

        /**
         * Load configuration from our config file, or substitute defaults.
         */
        void load(bool oldConfig = false);

        /**
         * Save configuration to our config file.
         */
        void store();

        /**
         * Determines whether the player in question is being ignored, filtered by
         * the specified flags.
         */
        unsigned int checkPermissionSilently(const std::string &player_name,
                                             unsigned int flags);

        /**
         * Tests whether the player in question is being ignored for any of the
         * actions in the specified flags. If so, trigger appropriate side effects
         * if requested by the player.
         */
        bool hasPermission(Being *being, unsigned int flags);

        bool hasPermission(const std::string &being, unsigned int flags);

        /**
         * Updates the relationship with this player.
         */
        void setRelation(const std::string &name,
                         PlayerRelation::Relation relation);

        /**
         * Updates the relationship with this player.
         */
        PlayerRelation::Relation getRelation(const std::string &name);

        /**
         * Deletes the information recorded for a player.
         */
        void removePlayer(const std::string &name);

        /**
         * Retrieves the default permissions.
         */
        unsigned int getDefault() const;

        /**
         * Sets the default permissions.
         */
        void setDefault(unsigned int permissions);

        /**
         * Retrieves all known player ignore strategies.
         *
         * The player ignore strategies are allocated statically and must
         * not be deleted.
         */
        std::vector<PlayerIgnoreStrategy *> *getPlayerIgnoreStrategies();

        /**
         * Return the current player ignore strategy.
         *
         * \return A player ignore strategy, or nullptr
         */
        PlayerIgnoreStrategy *getPlayerIgnoreStrategy() const
        { return mIgnoreStrategy; }

        /**
         * Sets the strategy to call when ignoring players.
         */
        void setPlayerIgnoreStrategy(PlayerIgnoreStrategy *strategy)
        { mIgnoreStrategy = strategy; }

        /**
         * For a given ignore strategy short name, find the appropriate index
         * in the ignore strategies vector.
         *
         * \param The short name of the ignore strategy to look up
         * \return The appropriate index, or -1
         */
        int getPlayerIgnoreStrategyIndex(const std::string &shortname);

        /**
         * Retrieves a sorted vector of all players for which we have any
         * relations recorded.
         */
        std::vector<std::string> *getPlayers();

        /**
         * Removes all recorded player info.
         */
        void clear();

        /**
         * Do we persist our `ignore' setup?
         */
        bool getPersistIgnores() const
        { return mPersistIgnores; }

        void ignoreTrade(std::string name);

        bool isGoodName(Being *being);

        bool isGoodName(std::string name);

        /**
         * Change the `ignore persist' flag.
         *
         * @param value Whether to persist ignores
         */
        void setPersistIgnores(bool value)
        { mPersistIgnores = value; }

        void addListener(PlayerRelationsListener *listener)
        { mListeners.push_back(listener); }

        void removeListener(PlayerRelationsListener *listener)
        { mListeners.remove(listener); }

        bool checkBadRelation(std::string name);

    private:
        void signalUpdate(const std::string &name);

        bool mPersistIgnores; // If NOT set, we delete the
                              // ignored data upon reloading
        unsigned int mDefaultPermissions;

        bool checkName(const std::string &name) const;

        PlayerIgnoreStrategy *mIgnoreStrategy;
        std::map<std::string, PlayerRelation *> mRelations;
        std::list<PlayerRelationsListener *> mListeners;
        std::vector<PlayerIgnoreStrategy *> mIgnoreStrategies;
};


extern PlayerRelationsManager player_relations; // singleton representation
                                                // of player relations


#endif // PLAYER_RELATIONS_H