/*
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * Copyright (C) 2008-2009 Trinity <http://www.trinitycore.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
 */

#ifndef _BYTEBUFFER_H
#define _BYTEBUFFER_H

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

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

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

        // constructor
        ByteBuffer(size_t res): _rpos(0), _wpos(0)
        {
            _storage.reserve(res);
        }

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

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

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

        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)
        {
            append((uint8 const *)value.c_str(), value.length());
            append((uint8)0);
            return *this;
        }

        ByteBuffer &operator<<(const char *str)
        {
            append((uint8 const *)str, str ? strlen(str) : 0);
            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 pos) const
        {
            return read<uint8>(pos);
        }

        size_t rpos() const { return _rpos; }

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

        size_t wpos() const { return _wpos; }

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

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

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

        void read(uint8 *dest, size_t len)
        {
            ASSERT(_rpos  + len  <= size() || PrintPosError(false, _rpos, len));
            memcpy(dest, &_storage[_rpos], len);
            _rpos += len;
        }

        bool readPackGUID(uint64& guid)
        {
            if(rpos() + 1 > size())
                return false;

            guid = 0;

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

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

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

            return true;
        }

        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);
            _rpos = 0;
            _wpos = size();
        }

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

        void append(const std::string& str)
        {
            append((uint8 const*)str.c_str(), str.size() + 1);
        }

        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)
                return;

            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)
        {
            if (_storage.size() < _wpos + sizeof(guid) + 1)
                _storage.resize(_wpos + sizeof(guid) + 1);

            size_t mask_position = wpos();
            *this << uint8(0);
            for(uint8 i = 0; i < 8; ++i)
            {
                if(guid & 0xFF)
                {
                    _storage[mask_position] |= uint8(1 << i);
                    *this << uint8(guid & 0xFF);
                }

                guid >>= 8;
            }
        }

        void put(size_t pos, const uint8 *src, size_t cnt)
        {
            ASSERT(pos + cnt <= size() || PrintPosError(true, pos, cnt));
            memcpy(&_storage[pos], src, cnt);
        }

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

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

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

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

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

            uint32 j = 1, k = 1;
            sLog.outDebug("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:
        bool PrintPosError(bool add, size_t pos, size_t esize) const
        {
            sLog.outError("ERROR: Attempt %s in ByteBuffer (pos: %lu size: %lu) value with size: %lu",(add ? "put" : "get"),(unsigned long)pos, (unsigned long)size(), (unsigned long)esize);

            // assert must fail after function call
            return false;
        }

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

template <typename T> 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> 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> 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> 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> 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> 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;
}
#endif