#include "lotrodatmanager.h"
#include "models/filesystem.h"
#include "models/settings.h"

#include <QDebug>
#include <QProcess>

Q_DECLARE_METATYPE(LotroDatManager::Category)


LotroDatManager::LotroDatManager(QObject *parent) :  QObject(parent), client_local_file_(1), client_general_file_(2) {
}

LotroDatManager::~LotroDatManager() {
    deinitializeManager();
}

bool LotroDatManager::initialised() {
    return client_general_file_.Initialized() && client_local_file_.Initialized();
}

bool LotroDatManager::datPathIsRelevant() {
    QString game_folder = Settings::getValue("Lotro/game_path").toString();
    QString locale_prefix = Settings::getValue("Lotro/original_locale").toString();

    QString client_local_filepath = game_folder + "/client_local_" + locale_prefix + ".dat";
    QString client_general_filepath = game_folder + "/client_general.dat";

    QString client_local_current_path = QString::fromStdString(client_local_file_.GetFilename());
    QString client_general_current_path = QString::fromStdString(client_general_file_.GetFilename());

    return QFileInfo(client_local_filepath) != QFileInfo(client_local_current_path)
            || QFileInfo(client_general_filepath) != QFileInfo(client_general_current_path);
}

void LotroDatManager::initializeManager()
{
    emit operationStarted("initializeManager");
    qDebug() << __FUNCTION__ << "Starting initialisation of LotroDatManager";

    QString game_folder = Settings::getValue("Lotro/game_path").toString();
    QString locale_prefix = Settings::getValue("Lotro/original_locale").toString();

    QString client_local_filepath = game_folder + "/client_local_" + locale_prefix + ".dat";
    QString client_general_filepath = game_folder + "/client_general.dat";

    if (!FileSystem::fileExists(client_local_filepath) || !FileSystem::fileExists(client_general_filepath)) {
        emit errorOccured("initializeManager", {}, "DatFilesNotFound");
        emit operationFinished("initializeManager", {}, false);
        return;
    }

    // Updating file permissions to be sure, that they're not in read-only mode

    if (!QFile::setPermissions(client_local_filepath, QFileDevice::Permission(0x6666))) {
        qDebug() << __FUNCTION__ << "Unable to update permissions on client_local_* file!";
    }

    if (!QFile::setPermissions(client_general_filepath, QFileDevice::Permission(0x6666))) {
        qDebug() << __FUNCTION__ << "Unable to update permissions on client_general* file!";
    }

    // Initialising client_local_*.dat file and client_general.dat

    auto client_local_init_res = client_local_file_.Init(client_local_filepath.toStdString());
    auto client_general_init_res = client_general_file_.Init(client_general_filepath.toStdString());

    if (!client_local_init_res || !client_general_init_res) {
        client_local_file_.Deinit();
        client_general_file_.Deinit();

        qDebug() << __FUNCTION__ << "Finished LotroDatManager initialisation - error: DatFile initialisation error!";

        emit errorOccured("initializeManager", {}, "DatInitError");
        emit operationFinished("initializeManager", {}, false);
        return;
    }

    qDebug() << "LotroDatManager initialisation successfull! Dat files: "
             << QString::fromStdString(client_general_file_.GetFilename())
             << QString::fromStdString(client_local_file_.GetFilename());

    emit operationFinished("initializeManager", {}, true);
}

void LotroDatManager::deinitializeManager() {
    emit operationStarted("deinitializeManager");
    client_local_file_.Deinit();
    client_general_file_.Deinit();
    emit operationFinished("deinitializeManager");
}

void LotroDatManager::startGame(bool freeze_updates) {
    // if freeze_updates is set to True, original game
    // launcher will be replaced with special program,
    // which controls lotro startup and prevents from updates
    emit operationStarted("startGame");

    QString game_folder = Settings::getValue("Lotro/game_path").toString();

    if (game_folder == "none") {
        qDebug() << __FUNCTION__ << "Starting game FAILED - game folder wasnt set!";
        emit errorOccured("startGame", {}, "GameFolderNotSet");
        emit operationFinished("startGame", {}, false);
        return;
    }

    if (!FileSystem::fileExists(QApplication::applicationDirPath() + "/Launcher.exe")) {
        qDebug() << __FUNCTION__ << "Starting game FAILED - no game launcher in legacy directory found!";
        emit errorOccured("startGame", {}, "NoGameLauncherInLegacyDir");
        emit operationFinished("startGame", {}, false);
        return;
    }

    if (freeze_updates) {
        QFile::remove(game_folder + "/lotro_ru.exe");
        if (!QFile::copy(QApplication::applicationDirPath() + "/LotroLauncher.exe", game_folder + "/lotro_ru.exe")) {
            qDebug() << __FUNCTION__ << "Starting game FAILED - cannot copy LotroLauncher to lotro_ru.exe!!";
            emit errorOccured("startGame", {}, "LauncherCopyFailed");
            emit operationFinished("startGame", {}, false);
            return;
        }

        QFile::remove(game_folder + "/LotroLauncher.exe");
        if (!QFile::copy(QApplication::applicationDirPath() + "/Launcher.exe", game_folder + "/LotroLauncher.exe")) {
            qDebug() << __FUNCTION__ << "Starting game FAILED - cannot copy GameLauncher to LotroLauncher!!";
            emit errorOccured("startGame", {}, "NoAccessToGameLauncher");
            emit operationFinished("startGame", {}, false);
            return;
        }

        QFile file(game_folder + "/legacy_path.txt");
        file.open(QIODevice::WriteOnly);
        QTextStream out(&file);
        out << QApplication::applicationDirPath() + "/LegacyLauncher.exe";
        file.close();
    } else {
        QFile::remove(game_folder + "/LotroLauncher.exe");
        if (!QFile::copy(QApplication::applicationDirPath() + "/LotroLauncher.exe", game_folder + "/LotroLauncher.exe")) {
            qDebug() << __FUNCTION__ << "Starting game FAILED - cannot copy LotroLauncher from working dir to LotroLauncher in lotro dir!!";
            emit errorOccured("startGame", {}, "NoAccessToGameLauncher");
            emit operationFinished("startGame", {}, false);
            return;
        }
    }

    QStringList args;
    if (freeze_updates) {
        args << "gamelaunch" << "-disablePatch";
    }

    if (Settings::getValue("Lotro/skip_raw_download").toBool()) {
        args << "-skiprawdownload";
    }

    if (Settings::getValue("Lotro/no_splash_screen").toBool()) {
        args << "-nosplashscreen";
    }

    client_general_file_.Deinit();
    client_local_file_.Deinit();

    QString username = Settings::getValue("Account/username").toString();
    QString password = Settings::getValue("Account/password").toString();
    if (!username.isEmpty() && !password.isEmpty()) {
        args << "-username" << username << "-password" << password;
    }

    qDebug() << __FUNCTION__ << "Starting game with arguments: " << args;

    QFile f(Settings::getValue("Lotro/game_path").toString() + "/LotroLauncher.exe");
    QProcess process;

    if (FileSystem::fileExists(f.fileName())) {
        if (f.fileName().contains(" ")) {
            f.setFileName("\"" + f.fileName() + "\"");
        }

        process.startDetached(f.fileName(), args);
        process.waitForFinished(-1);
        QApplication::quit();
    }

    emit operationFinished("startGame");
}

void LotroDatManager::installPatch(QString patch_name, QString database_path, RESOURCE_FILE_TYPE dat_file) {
    emit operationStarted("installPatch", {patch_name, database_path});
    LOTRO_DAT::Database db;

    if (!db.InitDatabase(database_path.toStdString())) {
        qDebug() << __FUNCTION__ << "Error database " << database_path << ": failed to open!";
        return;
    }

    size_t patched_files_num = 0;

    LOTRO_DAT::SubfileData file;
    int i = 0;
    const int total_files = db.CountRows();
    qDebug() << "Patching all files from database...";
    while (!(file = db.GetNextFile()).Empty()) {
        if (i * 100 / total_files != (i - 1) * 100 / total_files) {
            qDebug() << "Completed " << i * 100 / total_files << "%";
        }
        ++i;

        if (!file.options["fid"]) {
            continue;
        }

        if (dat_file == E_CLIENT_LOCAL) {
            client_local_file_.PatchFile(file);
        } else if (dat_file == E_CLIENT_GENERAL) {
            client_general_file_.PatchFile(file);
        }
        ++patched_files_num;
    }

    db.CloseDatabase();
    emit operationFinished("installPatch", {patch_name, database_path}, true);
}

void LotroDatManager::createBackup()
{
//    emit operationStarted("createBackup");
//    QString locale_prefix = Settings::getValue("Lotro/original_locale").toString();
//    QString client_local_backup_path = QApplication::applicationDirPath() + Settings::getValue("Backup/path").toString() + "client_local_" + locale_prefix + ".dat";
//    QString client_general_backup_path = QApplication::applicationDirPath() + Settings::getValue("Backup/path").toString() + "client_general.dat";
//    auto loc_res = client_local_file_.GetBackupManager().CreateBackup(client_local_backup_path.toStdString());
//    auto gen_res = client_general_file_.GetBackupManager().CreateBackup(client_general_backup_path.toStdString());
//    bool operations_result = (loc_res.result == LOTRO_DAT::SUCCESS && gen_res.result == LOTRO_DAT::SUCCESS);

//    emit operationFinished("createBackup", {client_local_backup_path, client_general_backup_path}, operations_result);
}

void LotroDatManager::restoreFromBackup()
{
//    emit operationStarted("restoreFromBackup");
//    QString locale_prefix = Settings::getValue("Lotro/original_locale").toString();
//    QString client_local_backup_path = QApplication::applicationDirPath() + Settings::getValue("Backup/path").toString() + "client_local_" + locale_prefix + ".dat";
//    QString client_general_backup_path = QApplication::applicationDirPath() + Settings::getValue("Backup/path").toString() + "client_general.dat";
//    auto loc_res = client_local_file_.GetBackupManager().RestoreFromBackup(client_local_backup_path.toStdString());
//    auto gen_res = client_general_file_.GetBackupManager().RestoreFromBackup(client_general_backup_path.toStdString());
//    bool operations_result = (loc_res.result == LOTRO_DAT::SUCCESS && gen_res.result == LOTRO_DAT::SUCCESS);
//    emit operationFinished("restoreFromBackup", {}, operations_result);
}

void LotroDatManager::removeBackup()
{
//    emit operationStarted("removeBackup");
//    QString locale_prefix = Settings::getValue("Lotro/original_locale").toString();
//    QString client_local_backup_path = QApplication::applicationDirPath() + Settings::getValue("Backup/path").toString() + "client_local_" + locale_prefix + ".dat";
//    QString client_general_backup_path = QApplication::applicationDirPath() + Settings::getValue("Backup/path").toString() + "client_general.dat";
//    auto loc_res = client_local_file_.GetBackupManager().RemoveBackup(client_local_backup_path.toStdString());
//    auto gen_res = client_general_file_.GetBackupManager().RemoveBackup(client_general_backup_path.toStdString());
//    bool operations_result = (loc_res.result == LOTRO_DAT::SUCCESS && gen_res.result == LOTRO_DAT::SUCCESS);
//    emit operationFinished("removeBackup", {}, operations_result);
}