/*
 * Copyright (C) 2008-2012 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 _BYTEBUFFER_H
#define _BYTEBUFFER_H

#include "Common.h"
#include "Debugging/Errors.h"
#include "Log.h"
#include "Utilities/ByteConverter.h"



class ByteBufferException
{
    public:
        ByteBufferException(size_t pos, size_t size, size_t valueSize)
            : Pos(pos), Size(size), ValueSize(valueSize)
        {
        }

    protected:
        size_t Pos;
        size_t Size;
        size_t ValueSize;
};

class ByteBufferPositionException : public ByteBufferException
{
    public:
        ByteBufferPositionException(bool add, size_t pos, size_t size, size_t valueSize)
        : ByteBufferException(pos, size, valueSize), _add(add)
        {
            PrintError();
        }

    protected:
        void PrintError() const
        {
            sLog->outError("Attempted to %s value with size: "SIZEFMTD" in ByteBuffer (pos: " SIZEFMTD " size: "SIZEFMTD") " ,
                (_add ? "put" : "get"), ValueSize, Pos, Size);
        }

    private:
        bool _add;
};

class ByteBufferSourceException : public ByteBufferException
{
    public:
        ByteBufferSourceException(size_t pos, size_t size, size_t valueSize)
        : ByteBufferException(pos, size, valueSize)
        {
            PrintError();
        }

    protected:
        void PrintError() const
        {
            sLog->outError("Attempted to put a %s in ByteBuffer (pos: "SIZEFMTD" size: "SIZEFMTD")",
                (ValueSize > 0 ? "NULL-pointer" : "zero-sized value"), Pos, Size);
        }
};

class BitStream
{
    public:
        BitStream(): _rpos(0), _wpos(0) {}

        BitStream(uint32 val, size_t len): _rpos(0), _wpos(0)
        {
            WriteBits(val, len);
        }

        BitStream(BitStream const& bs) : _data(bs._data), _rpos(bs._rpos), _wpos(bs._wpos) {}

        void Clear();
        uint8 GetBit(uint32 bit);
        uint8 ReadBit();
        void WriteBit(uint32 bit);
        template <typename T> void WriteBits(T value, size_t bits);
        bool Empty();
        void Reverse();
        void Print();

        size_t GetLength() { return _data.size(); }
        uint32 GetReadPosition() { return _rpos; }
        uint32 GetWritePosition() { return _wpos; }
        void SetReadPos(uint32 pos) { _rpos = pos; }

        uint8 const& operator[](uint32 const pos) const
        {
            return _data[pos];
        }

        uint8& operator[] (uint32 const pos)
        {
            return _data[pos];
        }

    private:
        std::vector<uint8> _data;
        uint32 _rpos, _wpos;
};

class ByteBuffer
{
    public:
        const static size_t DEFAULT_SIZE = 0x1000;

        // constructor
        ByteBuffer(): _rpos(0), _wpos(0), _bitpos(8), _curbitval(0)
        {
            _storage.reserve(DEFAULT_SIZE);
        }

        // constructor
        ByteBuffer(size_t res, bool init = false);

        // copy constructor
        ByteBuffer(const ByteBuffer &buf) : _rpos(buf._rpos), _wpos(buf._wpos),
            _bitpos(buf._bitpos), _curbitval(buf._curbitval), _storage(buf._storage)
        {
        }

        void clear()
        {
            _storage.clear();
            _rpos = _wpos = 0;
        }

        template <typename T> void append(T value)
        {
            FlushBits();
            EndianConvert(value);
            append((uint8 *)&value, sizeof(value));
        }

        void FlushBits()
        {
            if (_bitpos == 8)
                return;

            append((uint8 *)&_curbitval, sizeof(uint8));
            _curbitval = 0;
            _bitpos = 8;
        }

        bool WriteBit(uint32 bit)
        {
            --_bitpos;
            if (bit)
                _curbitval |= (1 << (_bitpos));

            if (_bitpos == 0)
            {
                _bitpos = 8;
                append((uint8 *)&_curbitval, sizeof(_curbitval));
                _curbitval = 0;
            }

            return (bit != 0);
        }

        bool ReadBit()
        {
            ++_bitpos;
            if (_bitpos > 7)
            {
                _bitpos = 0;
                _curbitval = read<uint8>();
            }

            return ((_curbitval >> (7-_bitpos)) & 1) != 0;
        }

        template <typename T> void WriteBits(T value, size_t bits)
        {
            for (int32 i = bits-1; i >= 0; --i)
                WriteBit((value >> i) & 1);
        }

        uint32 ReadBits(size_t bits)
        {
            uint32 value = 0;
            for (int32 i = bits-1; i >= 0; --i)
                if (ReadBit())
                    value |= (1 << (i));

            return value;
        }

        BitStream ReadBitStream(uint32 len)
        {
            BitStream b;
            for (uint32 i = 0; i < len; ++i)
                b.WriteBit(ReadBit());
            return b;
        }

        void ReadByteMask(uint8& b)
        {
            b = ReadBit() ? 1 : 0;
        }

        void ReadByteSeq(uint8& b)
        {
            if (b != 0)
                b ^= read<uint8>();
        }

        uint8 ReadXorByte()
        {
            return ReadUInt8() ^ 1;
        }

        void ReadXorByte(uint32 bit, uint8& byte)
        {
            if (!bit)
                byte = 0;
            else
                byte = ReadUInt8() ^ bit;
        }

        void WriteByteMask(uint8 b)
        {
            WriteBit(b);
        }

        void WriteByteSeq(uint8 b)
        {
            if (b != 0)
                append<uint8>(b ^ 1);
        }

        template <typename T> void put(size_t pos, T value)
        {
            EndianConvert(value);
            put(pos, (uint8 *)&value, sizeof(value));
        }

        ByteBuffer &operator<<(uint8 value)
        {
            append<uint8>(value);
            return *this;
        }

        ByteBuffer &operator<<(uint16 value)
        {
            append<uint16>(value);
            return *this;
        }

        ByteBuffer &operator<<(uint32 value)
        {
            append<uint32>(value);
            return *this;
        }

        ByteBuffer &operator<<(uint64 value)
        {
            append<uint64>(value);
            return *this;
        }

        // signed as in 2e complement
        ByteBuffer &operator<<(int8 value)
        {
            append<int8>(value);
            return *this;
        }

        ByteBuffer &operator<<(int16 value)
        {
            append<int16>(value);
            return *this;
        }

        ByteBuffer &operator<<(int32 value)
        {
            append<int32>(value);
            return *this;
        }

        ByteBuffer &operator<<(int64 value)
        {
            append<int64>(value);
            return *this;
        }

        // floating points
        ByteBuffer &operator<<(float value)
        {
            append<float>(value);
            return *this;
        }

        ByteBuffer &operator<<(double value)
        {
            append<double>(value);
            return *this;
        }

        ByteBuffer &operator<<(const std::string &value)
        {
            if (size_t len = value.length())
                append((uint8 const*)value.c_str(), len);
            append((uint8)0);
            return *this;
        }

        ByteBuffer &operator<<(const char *str)
        {
            size_t len = 0;
            if (str && (len = strlen(str)))
                append((uint8 const*)str, len);
            append((uint8)0);
            return *this;
        }

        ByteBuffer &operator>>(bool &value)
        {
            value = read<char>() > 0 ? true : false;
            return *this;
        }

        ByteBuffer &operator>>(uint8 &value)
        {
            value = read<uint8>();
            return *this;
        }

        ByteBuffer &operator>>(uint16 &value)
        {
            value = read<uint16>();
            return *this;
        }

        ByteBuffer &operator>>(uint32 &value)
        {
            value = read<uint32>();
            return *this;
        }

        ByteBuffer &operator>>(uint64 &value)
        {
            value = read<uint64>();
            return *this;
        }

        //signed as in 2e complement
        ByteBuffer &operator>>(int8 &value)
        {
            value = read<int8>();
            return *this;
        }

        ByteBuffer &operator>>(int16 &value)
        {
            value = read<int16>();
            return *this;
        }

        ByteBuffer &operator>>(int32 &value)
        {
            value = read<int32>();
            return *this;
        }

        ByteBuffer &operator>>(int64 &value)
        {
            value = read<int64>();
            return *this;
        }

        ByteBuffer &operator>>(float &value)
        {
            value = read<float>();
            return *this;
        }

        ByteBuffer &operator>>(double &value)
        {
            value = read<double>();
            return *this;
        }

        ByteBuffer &operator>>(std::string& value)
        {
            value.clear();
            while (rpos() < size())                         // prevent crash at wrong string format in packet
            {
                char c = read<char>();
                if (c == 0)
                    break;
                value += c;
            }
            return *this;
        }

        uint8& operator[](size_t const pos)
        {
            if (pos >= size())
                throw ByteBufferException(false, pos, 1, size());
            return _storage[pos];
        }

        uint8 const& operator[](size_t const pos) const
        {
            if (pos >= size())
                throw ByteBufferException(false, pos, 1, size());
            return _storage[pos];
        }

        size_t rpos() const { return _rpos; }

        size_t rpos(size_t rpos_)
        {
            _rpos = rpos_;
            return _rpos;
        }

        void rfinish()
        {
            _rpos = wpos();
        }

        size_t wpos() const { return _wpos; }

        size_t wpos(size_t wpos_)
        {
            _wpos = wpos_;
            return _wpos;
        }

        template<typename T>
        void read_skip() { read_skip(sizeof(T)); }

        void read_skip(size_t skip)
        {
            if (_rpos + skip > size())
                throw ByteBufferPositionException(false, _rpos, skip, size());
            _rpos += skip;
        }

        template <typename T> T read()
        {
            T r = read<T>(_rpos);
            _rpos += sizeof(T);
            return r;
        }

        template <typename T> T read(size_t pos) const
        {
            if (pos + sizeof(T) > size())
                throw ByteBufferPositionException(false, pos, sizeof(T), size());
            T val = *((T const*)&_storage[pos]);
            EndianConvert(val);
            return val;
        }

        void read(uint8 *dest, size_t len)
        {
            if (_rpos  + len > size())
               throw ByteBufferPositionException(false, _rpos, len, size());
            memcpy(dest, &_storage[_rpos], len);
            _rpos += len;
        }

        void readPackGUID(uint64& guid)
        {
            if (rpos() + 1 > size())
                throw ByteBufferPositionException(false, _rpos, 1, size());

            guid = 0;

            uint8 guidmark = 0;
            (*this) >> guidmark;

            for (int i = 0; i < 8; ++i)
            {
                if (guidmark & (uint8(1) << i))
                {
                    if (rpos() + 1 > size())
                        throw ByteBufferPositionException(false, _rpos, 1, size());

                    uint8 bit;
                    (*this) >> bit;
                    guid |= (uint64(bit) << (i * 8));
                }
            }
        }

        uint8 ReadUInt8()
        {
            uint8 u = 0;
            (*this) >> u;
            return u;
        }

        uint16 ReadUInt16()
        {
            uint16 u = 0;
            (*this) >> u;
            return u;
        }

        uint32 ReadUInt32()
        {
            uint32 u = 0;
            (*this) >> u;
            return u;
        }

        uint64 ReadUInt64()
        {
            uint64 u = 0;
            (*this) >> u;
            return u;
        }

        int8 ReadInt8()
        {
            int8 u = 0;
            (*this) >> u;
            return u;
        }

        int16 ReadInt16()
        {
            int16 u = 0;
            (*this) >> u;
            return u;
        }

        int32 ReadInt32()
        {
            uint32 u = 0;
            (*this) >> u;
            return u;
        }

        int64 ReadInt64()
        {
            int64 u = 0;
            (*this) >> u;
            return u;
        }

        std::string ReadString()
        {
            std::string s = 0;
            (*this) >> s;
            return s;
        }

        bool ReadBoolean()
        {
            uint8 b = 0;
            (*this) >> b;
            return b > 0 ? true : false;
        }

        float ReadSingle()
        {
            float f = 0;
            (*this) >> f;
            return f;
        }

        const uint8 *contents() const { return &_storage[0]; }

        size_t size() const { return _storage.size(); }
        bool empty() const { return _storage.empty(); }

        void resize(size_t newsize)
        {
            _storage.resize(newsize, 0);
            _rpos = 0;
            _wpos = size();
        }

        void reserve(size_t ressize)
        {
            if (ressize > size())
                _storage.reserve(ressize);
        }

        void append(const char *src, size_t cnt)
        {
            return append((const uint8 *)src, cnt);
        }

        template<class T> void append(const T *src, size_t cnt)
        {
            return append((const uint8 *)src, cnt * sizeof(T));
        }

        void append(const uint8 *src, size_t cnt)
        {
            if (!cnt)
                throw ByteBufferSourceException(_wpos, size(), cnt);

            if (!src)
                throw ByteBufferSourceException(_wpos, size(), cnt);

            ASSERT(size() < 10000000);

            if (_storage.size() < _wpos + cnt)
                _storage.resize(_wpos + cnt);
            memcpy(&_storage[_wpos], src, cnt);
            _wpos += cnt;
        }

        void append(const ByteBuffer& buffer)
        {
            if (buffer.wpos())
                append(buffer.contents(), buffer.wpos());
        }

        // can be used in SMSG_MONSTER_MOVE opcode
        void appendPackXYZ(float x, float y, float z)
        {
            uint32 packed = 0;
            packed |= ((int)(x / 0.25f) & 0x7FF);
            packed |= ((int)(y / 0.25f) & 0x7FF) << 11;
            packed |= ((int)(z / 0.25f) & 0x3FF) << 22;
            *this << packed;
        }

        void appendPackGUID(uint64 guid)
        {
            uint8 packGUID[8+1];
            packGUID[0] = 0;
            size_t size = 1;
            for (uint8 i = 0;guid != 0;++i)
            {
                if (guid & 0xFF)
                {
                    packGUID[0] |= uint8(1 << i);
                    packGUID[size] =  uint8(guid & 0xFF);
                    ++size;
                }

                guid >>= 8;
            }
            append(packGUID, size);
        }

        void put(size_t pos, const uint8 *src, size_t cnt)
        {
            if (pos + cnt > size())
                throw ByteBufferPositionException(true, pos, cnt, size());

            if (!src)
                throw ByteBufferSourceException(_wpos, size(), cnt);

            memcpy(&_storage[pos], src, cnt);
        }

        void print_storage() const
        {
            if (!sLog->IsOutDebug())                          // optimize disabled debug output
                return;

            sLog->outDebug(LOG_FILTER_NETWORKIO, "STORAGE_SIZE: %lu", (unsigned long)size() );
            for (uint32 i = 0; i < size(); ++i)
                sLog->outDebugInLine("%u - ", read<uint8>(i) );
            sLog->outDebug(LOG_FILTER_NETWORKIO, " ");
        }

        void textlike() const
        {
            if (!sLog->IsOutDebug())                          // optimize disabled debug output
                return;

            sLog->outDebug(LOG_FILTER_NETWORKIO, "STORAGE_SIZE: %lu", (unsigned long)size() );
            for (uint32 i = 0; i < size(); ++i)
                sLog->outDebugInLine("%c", read<uint8>(i) );
            sLog->outDebug(LOG_FILTER_NETWORKIO, " ");
        }

        void hexlike() const
        {
            if (!sLog->IsOutDebug())                          // optimize disabled debug output
                return;

            uint32 j = 1, k = 1;
            sLog->outDebug(LOG_FILTER_NETWORKIO, "STORAGE_SIZE: %lu", (unsigned long)size() );

            for (uint32 i = 0; i < size(); ++i)
            {
                if ((i == (j * 8)) && ((i != (k * 16))))
                {
                    if (read<uint8>(i) < 0x10)
                    {
                        sLog->outDebugInLine("| 0%X ", read<uint8>(i) );
                    }
                    else
                    {
                        sLog->outDebugInLine("| %X ", read<uint8>(i) );
                    }
                    ++j;
                }
                else if (i == (k * 16))
                {
                    if (read<uint8>(i) < 0x10)
                    {
                        sLog->outDebugInLine("\n");

                        sLog->outDebugInLine("0%X ", read<uint8>(i) );
                    }
                    else
                    {
                        sLog->outDebugInLine("\n");

                        sLog->outDebugInLine("%X ", read<uint8>(i) );
                    }

                    ++k;
                    ++j;
                }
                else
                {
                    if (read<uint8>(i) < 0x10)
                    {
                        sLog->outDebugInLine("0%X ", read<uint8>(i) );
                    }
                    else
                    {
                        sLog->outDebugInLine("%X ", read<uint8>(i) );
                    }
                }
            }
            sLog->outDebugInLine("\n");
        }

    protected:
        size_t _rpos, _wpos, _bitpos;
        uint8 _curbitval;
        std::vector<uint8> _storage;
};

template <typename T>
inline ByteBuffer &operator<<(ByteBuffer &b, std::vector<T> v)
{
    b << (uint32)v.size();
    for (typename std::vector<T>::iterator i = v.begin(); i != v.end(); ++i)
    {
        b << *i;
    }
    return b;
}

template <typename T>
inline ByteBuffer &operator>>(ByteBuffer &b, std::vector<T> &v)
{
    uint32 vsize;
    b >> vsize;
    v.clear();
    while (vsize--)
    {
        T t;
        b >> t;
        v.push_back(t);
    }
    return b;
}

template <typename T>
inline ByteBuffer &operator<<(ByteBuffer &b, std::list<T> v)
{
    b << (uint32)v.size();
    for (typename std::list<T>::iterator i = v.begin(); i != v.end(); ++i)
    {
        b << *i;
    }
    return b;
}

template <typename T>
inline ByteBuffer &operator>>(ByteBuffer &b, std::list<T> &v)
{
    uint32 vsize;
    b >> vsize;
    v.clear();
    while (vsize--)
    {
        T t;
        b >> t;
        v.push_back(t);
    }
    return b;
}

template <typename K, typename V>
inline ByteBuffer &operator<<(ByteBuffer &b, std::map<K, V> &m)
{
    b << (uint32)m.size();
    for (typename std::map<K, V>::iterator i = m.begin(); i != m.end(); ++i)
    {
        b << i->first << i->second;
    }
    return b;
}

template <typename K, typename V>
inline ByteBuffer &operator>>(ByteBuffer &b, std::map<K, V> &m)
{
    uint32 msize;
    b >> msize;
    m.clear();
    while (msize--)
    {
        K k;
        V v;
        b >> k >> v;
        m.insert(make_pair(k, v));
    }
    return b;
}

// TODO: Make a ByteBuffer.cpp and move all this inlining to it.
template<> inline std::string ByteBuffer::read<std::string>()
{
    std::string tmp;
    *this >> tmp;
    return tmp;
}

template<>
inline void ByteBuffer::read_skip<char*>()
{
    std::string temp;
    *this >> temp;
}

template<>
inline void ByteBuffer::read_skip<char const*>()
{
    read_skip<char*>();
}

template<>
inline void ByteBuffer::read_skip<std::string>()
{
    read_skip<char*>();
}

class BitConverter
{
    public:
        static uint8 ToUInt8(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<uint8>(start);
        }

        static uint16 ToUInt16(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<uint16>(start);
        }

        static uint32 ToUInt32(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<uint32>(start);
        }

        static uint64 ToUInt64(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<uint64>(start);
        }

        static int16 ToInt16(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<int16>(start);
        }

        static int32 ToInt32(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<int32>(start);
        }

        static int64 ToInt64(ByteBuffer const& buff, size_t start = 0)
        {
            return buff.read<int64>(start);
        }
};

#endif