/*
 * Copyright (C) 2008-2014 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * 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 TRINITYCORE_CHAT_H
#define TRINITYCORE_CHAT_H

#include "SharedDefines.h"
#include "WorldSession.h"
#include "RBAC.h"

#include <vector>

class ChatHandler;
class Creature;
class Group;
class Player;
class Unit;
class WorldSession;
class WorldObject;

struct GameTele;

class ChatCommand
{
    public:
        const char *       Name;
        uint32             Permission;                   // function pointer required correct align (use uint32)
        bool               AllowConsole;
        bool (*Handler)(ChatHandler*, const char* args);
        std::string        Help;
        ChatCommand*      ChildCommands;
};

class ChatHandler
{
    public:
        WorldSession* GetSession() { return m_session; }
        explicit ChatHandler(WorldSession* session) : m_session(session), sentErrorMessage(false) { }
        virtual ~ChatHandler() { }

        // Builds chat packet and returns receiver guid position in the packet to substitute in whisper builders
        static size_t BuildChatPacket(WorldPacket& data, ChatMsg chatType, Language language, uint64 senderGUID, uint64 receiverGUID, std::string const& message, uint8 chatTag,
                                    std::string const& senderName = "", std::string const& receiverName = "",
                                    uint32 achievementId = 0, bool gmMessage = false, std::string const& channelName = "");

        // Builds chat packet and returns receiver guid position in the packet to substitute in whisper builders
        static size_t BuildChatPacket(WorldPacket& data, ChatMsg chatType, Language language, WorldObject const* sender, WorldObject const* receiver, std::string const& message, uint32 achievementId = 0, std::string const& channelName = "", LocaleConstant locale = DEFAULT_LOCALE);

        static char* LineFromMessage(char*& pos) { char* start = strtok(pos, "\n"); pos = NULL; return start; }

        // function with different implementation for chat/console
        virtual const char *GetTrinityString(int32 entry) const;
        virtual void SendSysMessage(const char *str);

        void SendSysMessage(int32     entry);
        void PSendSysMessage(const char *format, ...) ATTR_PRINTF(2, 3);
        void PSendSysMessage(int32     entry, ...);
        std::string PGetParseString(int32 entry, ...) const;

        bool ParseCommands(const char* text);

        static ChatCommand* getCommandTable();

        bool isValidChatMessage(const char* msg);
        void SendGlobalSysMessage(const char *str);

        bool hasStringAbbr(const char* name, const char* part);

        // function with different implementation for chat/console
        virtual bool isAvailable(ChatCommand const& cmd) const;
        virtual bool HasPermission(uint32 permission) const { return m_session->HasPermission(permission); }
        virtual std::string GetNameLink() const { return GetNameLink(m_session->GetPlayer()); }
        virtual bool needReportToTarget(Player* chr) const;
        virtual LocaleConstant GetSessionDbcLocale() const;
        virtual int GetSessionDbLocaleIndex() const;

        bool HasLowerSecurity(Player* target, uint64 guid, bool strong = false);
        bool HasLowerSecurityAccount(WorldSession* target, uint32 account, bool strong = false);

        void SendGlobalGMSysMessage(const char *str);
        Player*   getSelectedPlayer();
        Creature* getSelectedCreature();
        Unit*     getSelectedUnit();
        WorldObject* getSelectedObject();
        // Returns either the selected player or self if there is no selected player
        Player*   getSelectedPlayerOrSelf();

        char*     extractKeyFromLink(char* text, char const* linkType, char** something1 = NULL);
        char*     extractKeyFromLink(char* text, char const* const* linkTypes, int* found_idx, char** something1 = NULL);

        // if args have single value then it return in arg2 and arg1 == NULL
        void      extractOptFirstArg(char* args, char** arg1, char** arg2);
        char*     extractQuotedArg(char* args);

        uint32    extractSpellIdFromLink(char* text);
        uint64    extractGuidFromLink(char* text);
        GameTele const* extractGameTeleFromLink(char* text);
        bool GetPlayerGroupAndGUIDByName(const char* cname, Player* &player, Group* &group, uint64 &guid, bool offline = false);
        std::string extractPlayerNameFromLink(char* text);
        // select by arg (name/link) or in-game selection online/offline player or self if a creature is selected
        bool extractPlayerTarget(char* args, Player** player, uint64* player_guid = NULL, std::string* player_name = NULL);

        std::string playerLink(std::string const& name) const { return m_session ? "|cffffffff|Hplayer:"+name+"|h["+name+"]|h|r" : name; }
        std::string GetNameLink(Player* chr) const;

        GameObject* GetNearbyGameObject();
        GameObject* GetObjectGlobalyWithGuidOrNearWithDbGuid(uint32 lowguid, uint32 entry);
        bool HasSentErrorMessage() const { return sentErrorMessage; }
        void SetSentErrorMessage(bool val){ sentErrorMessage = val; }
        static bool LoadCommandTable() { return load_command_table; }
        static void SetLoadCommandTable(bool val) { load_command_table = val; }

        bool ShowHelpForCommand(ChatCommand* table, const char* cmd);
    protected:
        explicit ChatHandler() : m_session(NULL), sentErrorMessage(false) { }     // for CLI subclass
        static bool SetDataForCommandInTable(ChatCommand* table, const char* text, uint32 permission, std::string const& help, std::string const& fullcommand);
        bool ExecuteCommandInTable(ChatCommand* table, const char* text, std::string const& fullcmd);
        bool ShowHelpForSubCommands(ChatCommand* table, char const* cmd, char const* subcmd);

    private:
        WorldSession* m_session;                           // != NULL for chat command call and NULL for CLI command

        // common global flag
        static bool load_command_table;
        bool sentErrorMessage;
};

class CliHandler : public ChatHandler
{
    public:
        typedef void Print(void*, char const*);
        explicit CliHandler(void* callbackArg, Print* zprint) : m_callbackArg(callbackArg), m_print(zprint) { }

        // overwrite functions
        const char *GetTrinityString(int32 entry) const override;
        bool isAvailable(ChatCommand const& cmd) const override;
        bool HasPermission(uint32 /*permission*/) const override { return true; }
        void SendSysMessage(const char *str) override;
        std::string GetNameLink() const override;
        bool needReportToTarget(Player* chr) const override;
        LocaleConstant GetSessionDbcLocale() const override;
        int GetSessionDbLocaleIndex() const override;

    private:
        void* m_callbackArg;
        Print* m_print;
};

#endif