/*
 * Copyright (C) 2008 Trinity <http://www.trinitycore.org/>
 *
 * Thanks to the original authors: MaNGOS <http://www.mangosproject.org/>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "AddonHandler.h"
#include "Database/DatabaseEnv.h"
#include "Opcodes.h"
#include "Log.h"
#include "Policies/SingletonImp.h"
#include "zlib/zlib.h"

INSTANTIATE_SINGLETON_1( AddonHandler );

AddonHandler::AddonHandler()
{
}

AddonHandler::~AddonHandler()
{
}

bool AddonHandler::BuildAddonPacket(WorldPacket *Source, WorldPacket *Target)
{
    ByteBuffer AddOnPacked;
    uLongf AddonRealSize;
    uint32 CurrentPosition;
    uint32 TempValue;

    unsigned char tdata[256] =
    {
        0xC3, 0x5B, 0x50, 0x84, 0xB9, 0x3E, 0x32, 0x42, 0x8C, 0xD0, 0xC7, 0x48, 0xFA, 0x0E, 0x5D, 0x54,
        0x5A, 0xA3, 0x0E, 0x14, 0xBA, 0x9E, 0x0D, 0xB9, 0x5D, 0x8B, 0xEE, 0xB6, 0x84, 0x93, 0x45, 0x75,
        0xFF, 0x31, 0xFE, 0x2F, 0x64, 0x3F, 0x3D, 0x6D, 0x07, 0xD9, 0x44, 0x9B, 0x40, 0x85, 0x59, 0x34,
        0x4E, 0x10, 0xE1, 0xE7, 0x43, 0x69, 0xEF, 0x7C, 0x16, 0xFC, 0xB4, 0xED, 0x1B, 0x95, 0x28, 0xA8,
        0x23, 0x76, 0x51, 0x31, 0x57, 0x30, 0x2B, 0x79, 0x08, 0x50, 0x10, 0x1C, 0x4A, 0x1A, 0x2C, 0xC8,
        0x8B, 0x8F, 0x05, 0x2D, 0x22, 0x3D, 0xDB, 0x5A, 0x24, 0x7A, 0x0F, 0x13, 0x50, 0x37, 0x8F, 0x5A,
        0xCC, 0x9E, 0x04, 0x44, 0x0E, 0x87, 0x01, 0xD4, 0xA3, 0x15, 0x94, 0x16, 0x34, 0xC6, 0xC2, 0xC3,
        0xFB, 0x49, 0xFE, 0xE1, 0xF9, 0xDA, 0x8C, 0x50, 0x3C, 0xBE, 0x2C, 0xBB, 0x57, 0xED, 0x46, 0xB9,
        0xAD, 0x8B, 0xC6, 0xDF, 0x0E, 0xD6, 0x0F, 0xBE, 0x80, 0xB3, 0x8B, 0x1E, 0x77, 0xCF, 0xAD, 0x22,
        0xCF, 0xB7, 0x4B, 0xCF, 0xFB, 0xF0, 0x6B, 0x11, 0x45, 0x2D, 0x7A, 0x81, 0x18, 0xF2, 0x92, 0x7E,
        0x98, 0x56, 0x5D, 0x5E, 0x69, 0x72, 0x0A, 0x0D, 0x03, 0x0A, 0x85, 0xA2, 0x85, 0x9C, 0xCB, 0xFB,
        0x56, 0x6E, 0x8F, 0x44, 0xBB, 0x8F, 0x02, 0x22, 0x68, 0x63, 0x97, 0xBC, 0x85, 0xBA, 0xA8, 0xF7,
        0xB5, 0x40, 0x68, 0x3C, 0x77, 0x86, 0x6F, 0x4B, 0xD7, 0x88, 0xCA, 0x8A, 0xD7, 0xCE, 0x36, 0xF0,
        0x45, 0x6E, 0xD5, 0x64, 0x79, 0x0F, 0x17, 0xFC, 0x64, 0xDD, 0x10, 0x6F, 0xF3, 0xF5, 0xE0, 0xA6,
        0xC3, 0xFB, 0x1B, 0x8C, 0x29, 0xEF, 0x8E, 0xE5, 0x34, 0xCB, 0xD1, 0x2A, 0xCE, 0x79, 0xC3, 0x9A,
        0x0D, 0x36, 0xEA, 0x01, 0xE0, 0xAA, 0x91, 0x20, 0x54, 0xF0, 0x72, 0xD8, 0x1E, 0xC7, 0x89, 0xD2
    };

    // broken addon packet, can't be received from real client
    if (Source->rpos() + 4 > Source->size())
        return false;

    *Source >> TempValue;                                   //get real size of the packed structure

    // empty addon packet, nothing process, can't be received from real client
    if(!TempValue)
        return false;

    AddonRealSize = TempValue;                              //temp value because ZLIB only excepts uLongf

    CurrentPosition = Source->rpos();                       //get the position of the pointer in the structure

    AddOnPacked.resize(AddonRealSize);                      //resize target for zlib action

    if (!uncompress(const_cast<uint8*>(AddOnPacked.contents()), &AddonRealSize, const_cast<uint8*>((*Source).contents() + CurrentPosition), (*Source).size() - CurrentPosition)!= Z_OK)
    {
        Target->Initialize(SMSG_ADDON_INFO);

        while(AddOnPacked.rpos() < AddOnPacked.size())
        {
            std::string AddonNames;
            uint8 unk6;
            uint32 crc, unk7;

            // check next addon data format correctness
            if(AddOnPacked.rpos()+1+4+4+1 > AddOnPacked.size())
                return false;

            AddOnPacked >> AddonNames;

            // recheck next addon data format correctness
            if(AddOnPacked.rpos()+4+4+1 > AddOnPacked.size())
                return false;

            AddOnPacked >> crc >> unk7 >> unk6;

            //sLog.outDebug("ADDON: Name:%s CRC:%x Unknown1 :%x Unknown2 :%x", AddonNames.c_str(), crc, unk7, unk6);

            *Target << (uint8)2;

            uint8 unk1 = 1;
            *Target << (uint8)unk1;
            if (unk1)
            {
                uint8 unk2 = crc != 0x1c776d01LL;           //If addon is Standard addon CRC
                *Target << (uint8)unk2;
                if (unk2)
                    Target->append(tdata, sizeof(tdata));

                *Target << (uint32)0;
            }

            uint8 unk3 = 0;
            *Target << (uint8)unk3;
            if (unk3)
            {
                // String, 256
            }
        }
    }
    else
    {
        sLog.outError("Addon packet uncompress error :(");
        return false;
    }
    return true;
}

/* Code use in 1.10.2 when client not ignore ban state sended for addons. Saved for reference if client switch to use server ban state information
void AddonHandler::BuildAddonPacket(WorldPacket* Source, WorldPacket* Target, uint32 Packetoffset)
{
    ByteBuffer AddOnPacked;
    uLongf AddonRealSize;
    uint32 CurrentPosition;
    uint32 TempValue;

    *Source >> TempValue;                                   //get real size of the packed structure

    AddonRealSize = TempValue;                              //temp value becouse ZLIB only excepts uLongf

    CurrentPosition = Source->rpos();                       //get the position of the pointer in the structure

    AddOnPacked.resize(AddonRealSize);                      //resize target for zlib action

    if (!uncompress((uint8*)AddOnPacked.contents(), &AddonRealSize, (uint8*)(*Source).contents() + CurrentPosition, (*Source).size() - CurrentPosition)!= Z_OK)
    {
        bool* AddonAllowed = new bool;                      //handle addon check and enable-ing

        uint32 Unknown1;
        uint8 Unknown0;

        AddOnPacked >> Unknown0;
        AddOnPacked >> Unknown1;

        Target->Initialize(SMSG_ADDON_INFO);

        uint32 i = 5;                                       //offset for addon extraction
        while(i != AddOnPacked.size())
        {
            std::string AddonNames;
            AddOns* Addonstr = new AddOns;
            uint8 unk6;
            uint64 CRCCHECK;
            AddOnPacked >> AddonNames >> CRCCHECK >> unk6;

            //sLog.outDebug("ADDON:    Name:%s CRC:%x Unknown:%x",AddonNames.c_str(), CRCCHECK,unk6);

            Addonstr->Name = AddonNames;
            Addonstr->CRC = CRCCHECK;

            //if not allowed but unknown added to list
            if (GetAddonStatus(Addonstr, AddonAllowed))     // If addon is new
            {
                Addonstr->Enabled = m_Addon_Default;        // by default new addons are set from Config file
                *AddonAllowed = m_Addon_Default;            // Set addon allowed on default value
                _AddAddon(Addonstr);
                sLog.outDetail("Found new Addon, Name:%s CRC:%x Unknown:%x",AddonNames.c_str(), CRCCHECK, unk6);
            }

            if (CRCCHECK == 0x4C1C776D01LL)                 //If addon is Standard addon CRC
            {
                                                            //value's standard Addons
                *Target << uint8(0) << uint8(2) << uint8(1) << uint8(0) << uint32(0);
            }
            else if (*AddonAllowed)                         //if addon is Custom addons
                                                            //value's enable addon
                *Target << uint8(0x00) << uint8(0x01) << uint8(0x00) << uint8(0x01);
            else
                                                            //value's disable addom
                *Target << uint8(0x00) << uint8(0x0) << uint8(0x00) << uint8(0x0);

            i += AddonNames.size() + 10;
        }
        *Target << uint8(0x0);

        //delete mem allocation
        delete AddonAllowed;
    }
    else
    {
        //handle uncompress error
    }
}
*/
