/*
 * Copyright (C) 2022 The V-Gears Team
 *
 * This file is part of V-Gears
 *
 * V-Gears is free software: you can redistribute it and/or modify it under
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, version 3.0 (GPLv3) of the License.
 *
 * V-Gears 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.
 */

#include <iostream>
#include <sstream>
#include <iomanip>
#include <Qt>
#include <QtCore/QProcess>
#include <QtWidgets/QFileDialog>
#include <QtCore/QDir>
#include <QtCore/QSettings>
#include <QtWidgets/QMessageBox>
#include <QtCore/QTimer>
#include <QtWidgets/QCheckBox>
#include "DataInstaller.h"
#include "MainWindow.h"
#include "ui_MainWindow.h"

/**
 * Indicates if an installer has already been created.
 */
static bool installer_created = false;

MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), main_window_(new Ui::MainWindow){
    main_window_->setupUi(this);
    // Goto the data tab by default.
    main_window_->tabWidget->setCurrentIndex(0);
    // Turn off the launcher tab for now since it dosen't actually work
    //main_window_->tabWidget->setTabEnabled(0, false);
    InitSettings();
    main_window_->btn_vgears_config->setText(settings_->value("ConfigDir").toString());
    main_window_->line_data_dst->setText(settings_->value("DataDir").toString());
    main_window_->line_vgears_exe->setText(settings_->value("VGearsEXE").toString());
    // TODO" Hard coded paths for debugging to save time. Remove them.
    main_window_->line_data_src->setText("/home/ivalentin/FF7InstallDisk/");
    //main_window_->line_data_dst->setText("/home/ivalentin/.v-gears/data/");
    timer_ = new QTimer(this);
    connect(timer_, SIGNAL(timeout()), this, SLOT(DoProgress()));
}

MainWindow::~MainWindow(){delete main_window_;}

void MainWindow::InitSettings(void){
    bool win = false;
#ifdef Q_OS_WIN
    settings_ = new QSettings(
      QCoreApplication::applicationDirPath() + "/" + "launcherSettings.ini",
      QSettings::IniFormat
    );
    win = true;
#else
    settings_ = new QSettings(
      QSettings::NativeFormat,QSettings::UserScope, "v-gears", "launcher", 0
    );
#endif
    //Check settings.
    if (settings_->value("ConfigDir").isNull()){
        if (win) settings_->setValue("ConfigDir", QString("%1/v-gears").arg(QDir::homePath()));
        else settings_->setValue("ConfigDir", QString("%1/.v-gears").arg(QDir::homePath()));
    }

    if (settings_->value("DataDir").isNull()){
        if (win) settings_->setValue("DataDir",QString("%1/v-gears/data").arg(QDir::homePath()));
        else settings_->setValue("DataDir",QString("%1/.v-gears/data").arg(QDir::homePath()));
    }

    if (settings_->value("VGearsEXE").isNull()){
        if (win){
            settings_->setValue(
              "VGearsEXE",QString("%1/v-gears.exe").arg(QCoreApplication::applicationDirPath())
            );
        }
        else settings_->setValue("VGearsEXE", QString("/usr/games/v-gears"));
    }
}

void MainWindow::on_line_vgears_config_editingFinished(){
    settings_->setValue("ConfigDir",main_window_->btn_vgears_config->text());
}

void MainWindow::on_btn_vgears_config_clicked(){
    QString temp = QFileDialog::getExistingDirectory(
      this, tr("Select Location of VGears Configuration Data,"),
      settings_->value("ConfigDir").toString()
    );
    if (!temp.isNull()){
        settings_->setValue("ConfigDir", temp);
        main_window_->btn_vgears_config->setText(temp);
    }
}

void MainWindow::on_line_vgears_exe_editingFinished(){
    settings_->setValue("VGearsEXE",main_window_->line_vgears_exe->text());
}

void MainWindow::on_btn_vgears_exe_clicked(){
    QString temp = QFileDialog::getOpenFileName(
      this, tr("Location of VGears Executable,"), QDir::rootPath()
    );
    if (!temp.isNull()){
        settings_->setValue("VGearsEXE", temp);
        main_window_->line_vgears_exe->setText(temp);
    }
}

void MainWindow::on_btn_vgears_run_clicked(){
    QString configDir(main_window_->btn_vgears_config->text());
    QString exe(main_window_->line_vgears_exe->text());
    QStringList args;
    args.append(
      QString("--resources-file=%1/resources.cfg").arg(main_window_->btn_vgears_config->text())
    );
    args.append(
      QString("--config-file=%1/v-gears.cfg").arg(main_window_->btn_vgears_config->text())
    );
    args.append(
      QString("--plugins-file=/%1/plugins.cfg").arg(main_window_->btn_vgears_config->text())
    );
    // Check that the config dir is set up correctly.
    QProcess vGears;
    vGears.startDetached(exe,args,configDir);
}

void MainWindow::on_btn_data_src_clicked(){
    QString temp = QFileDialog::getExistingDirectory(
      this, tr("Location of extracted original game data"), QDir::homePath()
    );
    main_window_->line_data_src->setText(temp);
}

void MainWindow::on_line_data_dst_editingFinished(){
    settings_->setValue("DataDir", main_window_->line_data_dst->text());
}

void MainWindow::on_btn_data_dst_clicked(){
    QString temp = QFileDialog::getExistingDirectory(
      this, tr("V-Gears data installation directory"), settings_->value("DataDir").toString()
    );
    if (!temp.isNull()){
        settings_->setValue("DataDir",temp);
        main_window_->line_data_dst->setText(temp);
    }
}

void MainWindow::on_btn_data_run_clicked(){
    if (main_window_->line_data_src->text().isEmpty()){
        QMessageBox::critical(
          this, tr("Input error"),
          tr(
            "The installation needs the original game data.\n\n"
            "Select a directory with the extracted data from Final Fantasy VII "
            "(PC version, install disk)."
          )
        );
    }
    else if (main_window_->line_data_dst->text().isEmpty())
        QMessageBox::critical(this, tr("Output error"), tr("No output path provided"));
    else{
        // Normalize the paths so its in / format separators.
        QString input = QDir::fromNativeSeparators(main_window_->line_data_src->text());
        if (!input.endsWith("/")) input += "/";
        QString output = QDir::fromNativeSeparators(main_window_->line_data_dst->text());
        if (!output.endsWith("/")) output += "/";
        // TODO: Enumerate files or find some better way to do this.
        const std::vector<std::string> required_files = {
          "data/field/char.lgp",
          "data/field/flevel.lgp",
          "data/kernel/KERNEL.BIN",
          "data/menu/menu_us.lgp",
          "data/sound/audio.fmt",
          "data/sound/audio.dat",
          "data/music/music.idx",
          "data/midi/midi.lgp",
          "data/battle/scene.bin",
          "ff7.exe"
        };
        // Ensure required files are in the input dir
        for (auto& file : required_files){
            QString full_path = input + QString::fromStdString(file);
            if (!QFile::exists(full_path)){
                QMessageBox::critical(
                  this, tr("Missing input file"),
                  tr(
                    "Some of the required files were not found among the extracted data.\n\n"
                    " Make sure that the file '"
                  ) + file.c_str() + tr("' is in the extracted data.")
                );
                return;
            }
        }
        if (installer_created){
            // Due to the use of singletons, the installer can't be re-run.
            // TODO: Verify that this is true, and if so, try to fix it.
            QMessageBox::critical(
              this, tr("Error"),
              tr("Please, fix the errors, and then close the installer before trying again.")
            );
            return;
        }
        // Start data conversion
        try{

            // Parse advanced options.
            DataInstaller::AdvancedOptions options;
            options.skip_kernel = (Qt::Checked == main_window_->chk_no_kernel->checkState());
            options.skip_images = (Qt::Checked == main_window_->chk_no_images->checkState());
            options.skip_sounds = (Qt::Checked == main_window_->chk_no_sounds->checkState());
            options.skip_music = (Qt::Checked == main_window_->chk_no_music->checkState());
            options.skip_fields = (Qt::Checked == main_window_->chk_no_fields->checkState());
            options.skip_field_models
              = (Qt::Checked == main_window_->chk_no_field_models->checkState());
            options.no_ffmpeg = (Qt::Checked == main_window_->chk_no_ffmpeg->checkState());
            options.no_timidity = (Qt::Checked == main_window_->chk_no_timidity->checkState());
            options.keep_originals = (Qt::Checked == main_window_->chk_keep_original->checkState());


            installer_created = true;
            installer_ = std::make_unique<DataInstaller>(
              QDir::toNativeSeparators(input).toStdString(),
              QDir::toNativeSeparators(output).toStdString(),
              options,
              [this](const std::string log_line, int level, bool as_progress = false){
                 main_window_->data_log->append(log_line.c_str());
                 std::cout << log_line << std::endl;
                 if (as_progress)
                     main_window_->label_progress->setText(log_line.c_str());
              }
            );
            OnInstallStarted();
        }
        catch (const std::exception& ex){OnInstallStopped();}
    }
}

void MainWindow::on_chk_advanced_options_stateChanged(){
    if (main_window_->chk_advanced_options->checkState() == Qt::Checked)
        main_window_->advancedOptions->setMaximumHeight(500);
    else main_window_->advancedOptions->setMaximumHeight(0);
}

void MainWindow::EnableUi(bool enable){
    main_window_->btn_data_run->setEnabled(enable);
    main_window_->line_data_src->setEnabled(enable);
    main_window_->btn_data_src->setEnabled(enable);
    main_window_->line_data_dst->setEnabled(enable);
    main_window_->btn_data_dst->setEnabled(enable);
    main_window_->data_progress_bar->setValue(0);
    if (!enable) timer_->start(0);
    else timer_->stop();
}

void MainWindow::OnInstallStarted(){EnableUi(false);}

void MainWindow::OnInstallStopped(){EnableUi(true);}

void MainWindow::DoProgress(){
    try{
        const float progress = installer_->Progress();
        main_window_->data_progress_bar->setValue(std::floor(progress));
        std::stringstream stream;
        stream << std::fixed << std::setprecision(2) << progress;
        stream << "%";
        std::string s = stream.str();
        main_window_->label_percent->setText(QString::fromUtf8(s.c_str()));
        if (progress >= 100) OnInstallStopped();
    }
    catch (const std::exception& ex){
        OnInstallStopped();
        QMessageBox::critical(this, tr("Data conversion exception"), ex.what());
    }
}