/*
 * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: http://github.com/azerothcore/azerothcore-wotlk/LICENSE-GPL2
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 */

#define _CRT_SECURE_NO_DEPRECATE

#include "dbcfile.h"

#include "mpq_libmpq04.h"
#include <utility>

DBCFile::DBCFile(std::string  filename):
    filename(std::move(filename)), recordSize(0), recordCount(0), fieldCount(0), stringSize(0), data(nullptr), stringTable(nullptr)
{
}

bool DBCFile::open()
{
    MPQFile f(filename.c_str());
    char header[4];
    unsigned int na, nb, es, ss;

    if (f.read(header, 4) != 4)                             // Number of records
        return false;

    if (header[0] != 'W' || header[1] != 'D' || header[2] != 'B' || header[3] != 'C')
        return false;

    if (f.read(&na, 4) != 4)                                // Number of records
        return false;
    if (f.read(&nb, 4) != 4)                                // Number of fields
        return false;
    if (f.read(&es, 4) != 4)                                // Size of a record
        return false;
    if (f.read(&ss, 4) != 4)                                // String size
        return false;

    recordSize = es;
    recordCount = na;
    fieldCount = nb;
    stringSize = ss;
    if (fieldCount * 4 != recordSize)
        return false;

    data = new unsigned char[recordSize * recordCount + stringSize];
    stringTable = data + recordSize * recordCount;

    size_t data_size = recordSize * recordCount + stringSize;
    if (f.read(data, data_size) != data_size)
        return false;
    f.close();
    return true;
}
DBCFile::~DBCFile()
{
    delete [] data;
}

DBCFile::Record DBCFile::getRecord(size_t id)
{
    assert(data);
    return Record(*this, data + id * recordSize);
}

size_t DBCFile::getMaxId()
{
    assert(data);

    size_t maxId = 0;
    for (size_t i = 0; i < getRecordCount(); ++i)
    {
        if (maxId < getRecord(i).getUInt(0))
            maxId = getRecord(i).getUInt(0);
    }
    return maxId;
}

DBCFile::Iterator DBCFile::begin()
{
    assert(data);
    return Iterator(*this, data);
}
DBCFile::Iterator DBCFile::end()
{
    assert(data);
    return Iterator(*this, stringTable);
}