#include "main_window.hpp"

#include "config.hpp"
#include "settings.hpp"

#include <QString>
#include <cerrno>
#include <fcntl.h>
#include <filesystem>
#include <fud_result.hpp>
#include <fud_status.hpp>
#include <string>
#include <vector>

namespace getsuyomi {

using fud::FudStatus;

GetsuyomiApp::GetsuyomiApp() : QMainWindow(nullptr), m_getsuyomi{new Getsuyomi(this)}
{
    readSettings();
}

FudStatus GetsuyomiApp::setup()
{
    setCentralWidget(m_getsuyomi);

    QCoreApplication::setApplicationName(AppName);
    QCoreApplication::setApplicationVersion(AppVersionString);
    setWindowTitle(AppName);

    auto envResult = getUserConfig();
    if (envResult.isError()) {
        qCritical("Failure %s", fud::FudStatusToString(envResult.getError()));
        return envResult.getError();
    }
    m_config = envResult.getOkay();

    createActions();
    createMenus();
    createToolBar();

    constexpr int minimumWidth = 640;
    constexpr int minimumHeight = 480;
    setMinimumSize(minimumWidth, minimumHeight);

    /* TODO: Wire up a proper status bar */
    statusBar()->addWidget(new QLabel("Status bar"));

    show();

    return FudStatus::Success;
}

void GetsuyomiApp::createActions()
{
    m_openFile = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::DocumentOpen), tr("&Open File"), this);
    connect(m_openFile, &QAction::triggered, this, &GetsuyomiApp::openFile);

    m_openDirectory = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::FolderOpen), tr("Open &Directory"), this);
    connect(m_openDirectory, &QAction::triggered, this, &GetsuyomiApp::openDirectory);

    m_quitAction = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::ApplicationExit), tr("&Quit"), this);
    connect(m_quitAction, &QAction::triggered, this, &GetsuyomiApp::quit);

    m_settingsAction = new QAction(QIcon("resources/gear.svg"), tr("&Settings"), this);
    connect(m_settingsAction, &QAction::triggered, this, &GetsuyomiApp::configure);

    m_aboutApp = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::HelpAbout), tr("&About"), this);
    connect(m_aboutApp, &QAction::triggered, this, &GetsuyomiApp::aboutApp);

    m_nextAction = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::GoNext), tr("Next"), this);
    connect(m_nextAction, &QAction::triggered, this, &GetsuyomiApp::next);

    m_backAction = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::GoPrevious), tr("Back"), this);
    connect(m_backAction, &QAction::triggered, this, &GetsuyomiApp::back);

    m_setSinglePageLayout = new QAction(QIcon("../resources/pageSingle.png"), tr("Single Page Layout"), this);
    connect(m_setSinglePageLayout, &QAction::triggered, this, &GetsuyomiApp::setSinglePageLayout);

    m_setDualPageLayout = new QAction(QIcon("../resources/pageDual.png"), tr("Dual Page Layout"), this);
    connect(m_setDualPageLayout, &QAction::triggered, this, &GetsuyomiApp::setDualPageLayout);

    m_setMangaLayout = new QAction(QIcon("../resources/pageManga.png"), tr("Manga Page Layout"), this);
    connect(m_setMangaLayout, &QAction::triggered, this, &GetsuyomiApp::setMangaLayout);

    m_setPageLayoutGroup = new QActionGroup(this);
    m_setPageLayoutGroup->addAction(m_setSinglePageLayout);
    m_setPageLayoutGroup->addAction(m_setDualPageLayout);
    m_setPageLayoutGroup->addAction(m_setMangaLayout);
    m_setPageLayoutGroup->setExclusionPolicy(QActionGroup::ExclusionPolicy::Exclusive);

    bindShortcuts();
}

void GetsuyomiApp::bindShortcuts()
{
    m_openFile->setShortcuts(m_config.openFileShortcuts);
    m_openFile->setStatusTip(tr("Open a file"));

    m_openDirectory->setShortcuts(m_config.openDirectoryShortcuts);
    m_openDirectory->setStatusTip(tr("Open a directory"));

    m_quitAction->setShortcuts(m_config.quitShortcuts);
    m_quitAction->setStatusTip(tr("Quit"));

    m_settingsAction->setShortcuts(m_config.settingsShortcuts);
    m_settingsAction->setStatusTip(tr("Configure getsuyomi"));

    m_nextAction->setShortcuts(m_config.nextShortcuts);
    m_nextAction->setStatusTip(tr("Next"));

    m_backAction->setShortcuts(m_config.backShortcuts);
    m_backAction->setStatusTip(tr("Back"));

    m_setSinglePageLayout->setShortcuts(m_config.singlePageShortcuts);
    m_setSinglePageLayout->setStatusTip(tr("Set Single Page Layout"));

    m_setDualPageLayout->setShortcuts(m_config.dualPageShortcuts);
    m_setDualPageLayout->setStatusTip(tr("Set Dual Page Layout"));

    m_setMangaLayout->setShortcuts(m_config.mangaPageShortcuts);
    m_setMangaLayout->setStatusTip(tr("Set Manga Page Layout"));
}

void GetsuyomiApp::createMenus()
{
    m_fileMenu = menuBar()->addMenu(tr("&File"));
    m_fileMenu->addAction(m_openFile);
    m_fileMenu->addAction(m_openDirectory);
    m_fileMenu->addAction(m_quitAction);

    m_settingsMenu = menuBar()->addMenu(tr("&Settings"));
    m_settingsMenu->addAction(m_settingsAction);

    m_helpMenu = menuBar()->addMenu(tr("&Help"));
    m_helpMenu->addAction(m_aboutApp);
}

void GetsuyomiApp::createToolBar()
{
    m_toolBar = addToolBar(tr("&Navigation"));
    m_toolBar->setObjectName("Navigation");

    // goto first
    m_toolBar->addAction(m_backAction);
    m_toolBar->addAction(m_nextAction);
    // goto last

    m_toolBar->addSeparator();

    m_toolBar->addAction(m_setSinglePageLayout);
    m_toolBar->addAction(m_setDualPageLayout);
    m_toolBar->addAction(m_setMangaLayout);
}

void GetsuyomiApp::openFile()
{
    auto dialog = QFileDialog(
        this,
        tr("Open Archive"),
        m_lastOpenedDirectory,
        tr("Archive types (*.zip *.cbz *.cbr *.gz)"));
    dialog.setFileMode(QFileDialog::ExistingFile);
    QString filename;
    if (dialog.exec()) {
        auto filenames = dialog.selectedFiles();
        if (filenames.length() == 0) {
            qWarning("No files selected.");
            return;
        } else if (filenames.length() > 1) {
            qWarning("Too many files selected %llu.", filenames.length());
            return;
        }
        filename = filenames[0];
        m_lastOpenedDirectory = dialog.directory().absolutePath();
        qDebug("Last opened directory is %s", qPrintable(m_lastOpenedDirectory));
    } else {
        qWarning("File dialog did not execute");
        return;
    }

    if (filename.endsWith(".zip")) {
        auto* archive = new ZipArchive(filename);
        if (!archive->valid()) {
            qCritical("Failed to change archive");
        } else {
            m_getsuyomi->setArchive(archive);
        }
    } else {
        qCritical("Unsupported file extension");
    }
}

void GetsuyomiApp::openDirectory()
{
    auto dialog = QFileDialog(this, tr("Open Directory"), m_lastOpenedDirectory);
    dialog.setFileMode(QFileDialog::Directory);
    QString directoryName;
    if (dialog.exec()) {
        auto filenames = dialog.selectedFiles();
        if (filenames.length() == 0) {
            qWarning("No files selected.");
            return;
        } else if (filenames.length() > 1) {
            qWarning("Too many files selected %llu.", filenames.length());
            return;
        }
        directoryName = filenames[0];
        m_lastOpenedDirectory = dialog.directory().absolutePath();
    } else {
        qWarning("File dialog did not execute");
        return;
    }
    qDebug("Opened directory %s", qPrintable(directoryName));
}

void GetsuyomiApp::quit()
{
    QCoreApplication::quit();
}

void GetsuyomiApp::configure()
{
    Settings settings(this, m_config.shortcuts());
    if (!settings.valid()) {
        qCritical("Invalid settings");
        return;
    }
    if (settings.exec()) {
        const auto& shortcuts = settings.shortcuts();
        setUserConfig(m_config, shortcuts.shortcutMap());
        bindShortcuts();
        auto saveStatus = shortcuts.save(m_config.configFilename);
        if (saveStatus != FudStatus::Success) {
            qWarning("Failed to save shortcuts.");
        }
    }
}

void GetsuyomiApp::aboutApp()
{
    /* TODO: proper implementation */
    QMessageBox::about(this, "About Getsuyomi", "A comic book reading app.");
}

void GetsuyomiApp::next()
{
    m_getsuyomi->next();
}

void GetsuyomiApp::back()
{
    m_getsuyomi->back();
}

void GetsuyomiApp::setSinglePageLayout()
{
    m_getsuyomi->setPageLayout(PageLayout::Single);
    m_setSinglePageLayout->setEnabled(false);
    m_setDualPageLayout->setEnabled(true);
    m_setMangaLayout->setEnabled(true);
}

void GetsuyomiApp::setDualPageLayout()
{
    m_getsuyomi->setPageLayout(PageLayout::Dual);
    m_setSinglePageLayout->setEnabled(true);
    m_setDualPageLayout->setEnabled(false);
    m_setMangaLayout->setEnabled(true);
}

void GetsuyomiApp::setMangaLayout()
{
    m_getsuyomi->setPageLayout(PageLayout::Manga);
    m_setSinglePageLayout->setEnabled(true);
    m_setDualPageLayout->setEnabled(true);
    m_setMangaLayout->setEnabled(false);
}

void GetsuyomiApp::closeEvent(QCloseEvent* event)
{
    writeSettings();
    QMainWindow::closeEvent(event);
}

void GetsuyomiApp::readSettings()
{

    QSettings settings{AppVendor, AppName};
    restoreGeometry(settings.value("geometry").toByteArray());
    restoreState(settings.value("windowState").toByteArray());
    m_lastOpenedDirectory = settings.value("lastOpenedDirectory", QDir::homePath()).toString();
}

void GetsuyomiApp::writeSettings()
{
    QSettings settings{AppVendor, AppName};
    settings.setValue("geometry", saveGeometry());
    settings.setValue("windowState", saveState());
    settings.setValue("lastOpenedDirectory", m_lastOpenedDirectory);
    settings.sync();
}

} // namespace getsuyomi