#include "fastfile_cod9.h"
#include "zonefile_cod9.h"

#include "utils.h"
#include "compressor.h"

#include <QFile>
#include <QDebug>

FastFile_COD9::FastFile_COD9() {

}

FastFile_COD9::~FastFile_COD9() {

}

bool FastFile_COD9::Load(const QString aFilePath) {
    if (aFilePath.isEmpty()) {
        return false;
    }

    // Check fastfile can be read
    QFile *file = new QFile(aFilePath);
    if (!file->open(QIODevice::ReadOnly)) {
        qDebug() << QString("Error: Failed to open FastFile: %1!").arg(aFilePath);
        return false;
    }

    // Decompress fastfile and close
    const QString fastFileStem = aFilePath.section("/", -1, -1);
    SetStem(fastFileStem);
    if (!Load(file->readAll())) {
        qDebug() << "Error: Failed to load fastfile: " << fastFileStem;
        return false;
    }

    file->close();

    // Open zone file after decompressing ff and writing
    return true;
}

bool FastFile_COD9::Load(const QByteArray aData) {
    QByteArray decompressedData;

    // Create a QDataStream on the input data.
    QDataStream fastFileStream(aData);
    fastFileStream.setByteOrder(QDataStream::LittleEndian);

    // Parse header values.
    SetCompany(pParseFFCompany(&fastFileStream));
    SetType(pParseFFFileType(&fastFileStream));
    SetSignage(pParseFFSignage(&fastFileStream));
    SetMagic(pParseFFMagic(&fastFileStream));
    quint32 version = pParseFFVersion(&fastFileStream);
    SetVersion(version);
    SetPlatform(pCalculateFFPlatform(version));
    SetGame("COD9");

    // For COD7/COD9, use BigEndian.
    fastFileStream.setByteOrder(QDataStream::BigEndian);
    if (GetPlatform() == "PC") {
        fastFileStream.setByteOrder(QDataStream::LittleEndian);
    }

    // Select key based on game.
    QByteArray key;
    if (GetGame() == "COD7") {
        fastFileStream.skipRawData(4);
        if (GetPlatform() == "360") {
            key = QByteArray::fromHex("1ac1d12d527c59b40eca619120ff8217ccff09cd16896f81b829c7f52793405d");
        } else if (GetPlatform() == "PS3") {
            key = QByteArray::fromHex("46D3F997F29C9ACE175B0DAE3AB8C0C1B8E423E2E3BF7E3C311EA35245BF193A");
            // or
            // key = QByteArray::fromHex("0C99B3DDB8D6D0845D1147E470F28A8BF2AE69A8A9F534767B54E9180FF55370");
        }
    } else if (GetGame() == "COD9") {
        if (GetPlatform() == "360") {
            key = QByteArray::fromHex("0E50F49F412317096038665622DD091332A209BA0A05A00E1377CEDB0A3CB1D3");
        } else if (GetPlatform() == "PC") {
            key = QByteArray::fromHex("641D8A2FE31D3AA63622BBC9CE8587229D42B0F8ED9B924130BF88B65EDC50BE");
        }
    }

    // Read the 8-byte magic.
    QByteArray fileMagic(8, Qt::Uninitialized);
    fastFileStream.readRawData(fileMagic.data(), 8);
    if (fileMagic != "PHEEBs71") {
        qWarning() << "Invalid fast file magic!";
        return false;
    }
    fastFileStream.skipRawData(4);

    // Read IV table name (32 bytes).
    QByteArray fileName(32, Qt::Uninitialized);
    fastFileStream.readRawData(fileName.data(), 32);

    // Build the IV table from the fileName.
    QByteArray ivTable = Compressor::InitIVTable(fileName);

    // Skip the RSA signature (256 bytes).
    QByteArray rsaSignature(256, Qt::Uninitialized);
    fastFileStream.readRawData(rsaSignature.data(), 256);

    // Now the stream should be positioned at 0x13C, where sections begin.
    int sectionIndex = 0;
    while (true) {
        qint32 sectionSize = 0;
        fastFileStream >> sectionSize;
        qDebug() << "Section index:" << sectionIndex << "Size:" << sectionSize
                 << "Pos:" << fastFileStream.device()->pos();
        if (sectionSize == 0)
            break;

        // Read the section data.
        QByteArray sectionData;
        sectionData.resize(sectionSize);
        fastFileStream.readRawData(sectionData.data(), sectionSize);

        // Compute the IV for this section.
        QByteArray iv = Compressor::GetIV(ivTable, sectionIndex);

        // Decrypt the section using Salsa20.
        QByteArray decData = Compressor::salsa20DecryptSection(sectionData, key, iv);

        // Compute SHA1 hash of the decrypted data.
        QByteArray sectionHash = QCryptographicHash::hash(decData, QCryptographicHash::Sha1);

        // Update the IV table based on the section hash.
        Compressor::UpdateIVTable(ivTable, sectionIndex, sectionHash);

        // Build a compressed data buffer by prepending the two-byte zlib header.
        QByteArray compressedData;
        compressedData.append(char(0x78));
        compressedData.append(char(0x01));
        compressedData.append(decData);

        if (GetPlatform() == "PC") {
            decompressedData.append(Compressor::DecompressZLIB(compressedData));
        } else if (GetPlatform() == "360") {
            decompressedData.append(LZX::DecompressLZX(decData, decData.size()));
        }

        // Optionally write out test files for COD9.
        QFile testFile("exports/" + QString("%1.out").arg(sectionIndex));
        if(testFile.open(QIODevice::WriteOnly)) {
            testFile.write(decompressedData);
            testFile.close();
        }

        sectionIndex++;
    }

    // For COD9, write out the complete decompressed zone for testing.
    QFile testFile("exports/test.zone");
    if(testFile.open(QIODevice::WriteOnly)) {
        testFile.write(decompressedData);
        testFile.close();
    }

    // Load the zone file with the decompressed data (using an Xbox platform flag).
    ZoneFile_COD9 zoneFile;
    zoneFile.Load(decompressedData, GetStem().section('.', 0, 0) + ".zone", FF_PLATFORM_XBOX);
    SetZoneFile(std::make_shared<ZoneFile_COD9>(zoneFile));

    return true;
}