#define _CRT_SECURE_NO_DEPRECATE

#include "dbcfile.h"
#include "loadlib/loadlib.h"

DBCFile::DBCFile(const std::string &filename):
    filename(filename),
    data(0)
{

}

DBCFile::DBCFile(HANDLE file) : fileHandle(file), data(0)
{

}

bool DBCFile::open()
{
    //if (!OpenNewestFile(filename.c_str(), &fileHandle))
    //    return false;

    char header[4];
    unsigned int na,nb,es,ss;

    if (!SFileReadFile(fileHandle, header, 4, NULL, NULL))              // Magic header
    {
        SFileCloseFile(fileHandle);
        return false;
    }

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

    if (!SFileReadFile(fileHandle, &na, 4, NULL, NULL))                 // Number of records
    {
        SFileCloseFile(fileHandle);
        return false;
    }

    if (!SFileReadFile(fileHandle, &nb, 4, NULL, NULL))                 // Number of fields
    {
        SFileCloseFile(fileHandle);
        return false;
    }

    if (!SFileReadFile(fileHandle, &es, 4, NULL, NULL))                 // Size of a record
    {
        SFileCloseFile(fileHandle);
        return false;
    }

    if (!SFileReadFile(fileHandle, &ss, 4, NULL, NULL))                 // String size
    {
        SFileCloseFile(fileHandle);
        return false;
    }

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

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

    size_t data_size = recordSize*recordCount+stringSize;

    if (!SFileReadFile(fileHandle, data, data_size, NULL, NULL))
    {
        SFileCloseFile(fileHandle);
        return false;
    }

    SFileCloseFile(fileHandle);
    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);
}