// SPDX-FileCopyrightText: 2017 Konstantinos Sideris <siderisk@auth.gr>
// SPDX-FileCopyrightText: 2021 Nheko Contributors
// SPDX-FileCopyrightText: 2022 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include <QApplication>
#include <QLayout>
#include <QMessageBox>
#include <QPluginLoader>
#include <QShortcut>

#include <mtx/requests.hpp>
#include <mtx/responses/login.hpp>

#include "Cache.h"
#include "Cache_p.h"
#include "ChatPage.h"
#include "Config.h"
#include "JdenticonProvider.h"
#include "Logging.h"
#include "LoginPage.h"
#include "MainWindow.h"
#include "MatrixClient.h"
#include "MemberList.h"
#include "RegisterPage.h"
#include "TrayIcon.h"
#include "UserSettingsPage.h"
#include "Utils.h"
#include "WelcomePage.h"
#include "ui/LoadingIndicator.h"
#include "ui/OverlayModal.h"
#include "ui/SnackBar.h"
#include "voip/WebRTCSession.h"

#include "dialogs/CreateRoom.h"

MainWindow *MainWindow::instance_ = nullptr;

MainWindow::MainWindow(QWidget *parent)
  : QMainWindow(parent)
  , userSettings_{UserSettings::instance()}
{
    instance_ = this;

    QMainWindow::setWindowTitle(0);
    setObjectName(QStringLiteral("MainWindow"));

    modal_ = new OverlayModal(this);

    restoreWindowSize();

    QFont font;
    font.setStyleStrategy(QFont::PreferAntialias);
    setFont(font);

    trayIcon_ = new TrayIcon(QStringLiteral(":/logos/nheko.svg"), this);

    welcome_page_     = new WelcomePage(this);
    login_page_       = new LoginPage(this);
    register_page_    = new RegisterPage(this);
    chat_page_        = new ChatPage(userSettings_, this);
    userSettingsPage_ = new UserSettingsPage(userSettings_, this);

    // Initialize sliding widget manager.
    pageStack_ = new QStackedWidget(this);
    pageStack_->addWidget(welcome_page_);
    pageStack_->addWidget(login_page_);
    pageStack_->addWidget(register_page_);
    pageStack_->addWidget(chat_page_);
    pageStack_->addWidget(userSettingsPage_);

    setCentralWidget(pageStack_);

    connect(welcome_page_, SIGNAL(userLogin()), this, SLOT(showLoginPage()));
    connect(welcome_page_, SIGNAL(userRegister()), this, SLOT(showRegisterPage()));

    connect(login_page_, SIGNAL(backButtonClicked()), this, SLOT(showWelcomePage()));
    connect(login_page_, &LoginPage::loggingIn, this, &MainWindow::showOverlayProgressBar);
    connect(register_page_, &RegisterPage::registering, this, &MainWindow::showOverlayProgressBar);
    connect(login_page_, &LoginPage::errorOccurred, this, [this]() { removeOverlayProgressBar(); });
    connect(
      register_page_, &RegisterPage::errorOccurred, this, [this]() { removeOverlayProgressBar(); });
    connect(register_page_, SIGNAL(backButtonClicked()), this, SLOT(showWelcomePage()));

    connect(chat_page_, &ChatPage::closing, this, &MainWindow::showWelcomePage);
    connect(
      chat_page_, &ChatPage::showOverlayProgressBar, this, &MainWindow::showOverlayProgressBar);
    connect(chat_page_, &ChatPage::unreadMessages, this, &MainWindow::setWindowTitle);
    connect(chat_page_, SIGNAL(unreadMessages(int)), trayIcon_, SLOT(setUnreadCount(int)));
    connect(chat_page_, &ChatPage::showLoginPage, this, [this](const QString &msg) {
        login_page_->showError(msg);
        showLoginPage();
    });

    connect(userSettingsPage_, &UserSettingsPage::moveBack, this, [this]() {
        pageStack_->setCurrentWidget(chat_page_);
    });

    connect(userSettingsPage_, SIGNAL(trayOptionChanged(bool)), trayIcon_, SLOT(setVisible(bool)));
    connect(
      userSettingsPage_, &UserSettingsPage::themeChanged, chat_page_, &ChatPage::themeChanged);
    connect(trayIcon_,
            SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
            this,
            SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));

    connect(chat_page_, SIGNAL(contentLoaded()), this, SLOT(removeOverlayProgressBar()));

    connect(this, &MainWindow::focusChanged, chat_page_, &ChatPage::chatFocusChanged);

    connect(chat_page_, &ChatPage::showUserSettingsPage, this, &MainWindow::showUserSettingsPage);

    connect(login_page_, &LoginPage::loginOk, this, [this](const mtx::responses::Login &res) {
        http::client()->set_user(res.user_id);
        showChatPage();
    });

    connect(register_page_, &RegisterPage::registerOk, this, &MainWindow::showChatPage);

    QShortcut *quitShortcut = new QShortcut(QKeySequence::Quit, this);
    connect(quitShortcut, &QShortcut::activated, this, QApplication::quit);

    trayIcon_->setVisible(userSettings_->tray());

    // load cache on event loop
    QTimer::singleShot(0, this, [this] {
        if (hasActiveUser()) {
            QString token       = userSettings_->accessToken();
            QString home_server = userSettings_->homeserver();
            QString user_id     = userSettings_->userId();
            QString device_id   = userSettings_->deviceId();

            http::client()->set_access_token(token.toStdString());
            http::client()->set_server(home_server.toStdString());
            http::client()->set_device_id(device_id.toStdString());

            try {
                using namespace mtx::identifiers;
                http::client()->set_user(parse<User>(user_id.toStdString()));
            } catch (const std::invalid_argument &) {
                nhlog::ui()->critical("bootstrapped with invalid user_id: {}",
                                      user_id.toStdString());
            }

            showChatPage();
        }
    });
}

void
MainWindow::setWindowTitle(int notificationCount)
{
    QString name = QStringLiteral("nheko");

    if (!userSettings_.data()->profile().isEmpty())
        name += " | " + userSettings_.data()->profile();
    if (notificationCount > 0) {
        name.append(QString{QStringLiteral(" (%1)")}.arg(notificationCount));
    }
    QMainWindow::setWindowTitle(name);
}

bool
MainWindow::event(QEvent *event)
{
    auto type = event->type();
    if (type == QEvent::WindowActivate) {
        emit focusChanged(true);
    } else if (type == QEvent::WindowDeactivate) {
        emit focusChanged(false);
    }

    return QMainWindow::event(event);
}

void
MainWindow::restoreWindowSize()
{
    int savedWidth  = userSettings_->qsettings()->value(QStringLiteral("window/width")).toInt();
    int savedheight = userSettings_->qsettings()->value(QStringLiteral("window/height")).toInt();

    nhlog::ui()->info("Restoring window size {}x{}", savedWidth, savedheight);

    if (savedWidth == 0 || savedheight == 0)
        resize(conf::window::width, conf::window::height);
    else
        resize(savedWidth, savedheight);
}

void
MainWindow::saveCurrentWindowSize()
{
    auto settings = userSettings_->qsettings();
    QSize current = size();

    settings->setValue(QStringLiteral("window/width"), current.width());
    settings->setValue(QStringLiteral("window/height"), current.height());
}

void
MainWindow::removeOverlayProgressBar()
{
    QTimer *timer = new QTimer(this);
    timer->setSingleShot(true);

    connect(timer, &QTimer::timeout, this, [this, timer]() {
        timer->deleteLater();

        if (modal_)
            modal_->hide();

        if (spinner_)
            spinner_->stop();
    });

    // FIXME:  Snackbar doesn't work if it's initialized in the constructor.
    QTimer::singleShot(0, this, [this]() {
        snackBar_ = new SnackBar(this);
        connect(chat_page_, &ChatPage::showNotification, snackBar_, &SnackBar::showMessage);
    });

    timer->start(50);
}

void
MainWindow::showChatPage()
{
    auto userid     = QString::fromStdString(http::client()->user_id().to_string());
    auto device_id  = QString::fromStdString(http::client()->device_id());
    auto homeserver = QString::fromStdString(http::client()->server() + ":" +
                                             std::to_string(http::client()->port()));
    auto token      = QString::fromStdString(http::client()->access_token());

    userSettings_.data()->setUserId(userid);
    userSettings_.data()->setAccessToken(token);
    userSettings_.data()->setDeviceId(device_id);
    userSettings_.data()->setHomeserver(homeserver);

    showOverlayProgressBar();

    pageStack_->setCurrentWidget(chat_page_);

    pageStack_->removeWidget(welcome_page_);
    pageStack_->removeWidget(login_page_);
    pageStack_->removeWidget(register_page_);

    login_page_->reset();
    chat_page_->bootstrap(userid, homeserver, token);
    connect(cache::client(),
            &Cache::databaseReady,
            userSettingsPage_,
            &UserSettingsPage::updateSecretStatus);
    connect(cache::client(),
            &Cache::secretChanged,
            userSettingsPage_,
            &UserSettingsPage::updateSecretStatus);
    emit reload();
}

void
MainWindow::closeEvent(QCloseEvent *event)
{
    if (WebRTCSession::instance().state() != webrtc::State::DISCONNECTED) {
        if (QMessageBox::question(
              this, QStringLiteral("nheko"), QStringLiteral("A call is in progress. Quit?")) !=
            QMessageBox::Yes) {
            event->ignore();
            return;
        }
    }

    if (!qApp->isSavingSession() && isVisible() && pageSupportsTray() && userSettings_->tray()) {
        event->ignore();
        hide();
    }
}

void
MainWindow::iconActivated(QSystemTrayIcon::ActivationReason reason)
{
    switch (reason) {
    case QSystemTrayIcon::Trigger:
        if (!isVisible()) {
            show();
        } else {
            hide();
        }
        break;
    default:
        break;
    }
}

bool
MainWindow::hasActiveUser()
{
    auto settings = userSettings_->qsettings();
    QString prefix;
    if (userSettings_->profile() != QLatin1String(""))
        prefix = "profile/" + userSettings_->profile() + "/";

    return settings->contains(prefix + "auth/access_token") &&
           settings->contains(prefix + "auth/home_server") &&
           settings->contains(prefix + "auth/user_id");
}

void
MainWindow::showOverlayProgressBar()
{
    spinner_ = new LoadingIndicator(this);
    spinner_->setFixedHeight(100);
    spinner_->setFixedWidth(100);
    spinner_->setObjectName(QStringLiteral("ChatPageLoadSpinner"));
    spinner_->start();

    showSolidOverlayModal(spinner_);
}

void
MainWindow::openCreateRoomDialog(
  std::function<void(const mtx::requests::CreateRoom &request)> callback)
{
    auto dialog = new dialogs::CreateRoom(this);
    connect(dialog,
            &dialogs::CreateRoom::createRoom,
            this,
            [callback](const mtx::requests::CreateRoom &request) { callback(request); });

    showDialog(dialog);
}

void
MainWindow::showTransparentOverlayModal(QWidget *content, QFlags<Qt::AlignmentFlag> flags)
{
    modal_->setWidget(content);
    modal_->setColor(QColor(30, 30, 30, 150));
    modal_->setDismissible(true);
    modal_->setContentAlignment(flags);
    modal_->raise();
    modal_->show();
}

void
MainWindow::showSolidOverlayModal(QWidget *content, QFlags<Qt::AlignmentFlag> flags)
{
    modal_->setWidget(content);
    modal_->setColor(QColor(30, 30, 30));
    modal_->setDismissible(false);
    modal_->setContentAlignment(flags);
    modal_->raise();
    modal_->show();
}

bool
MainWindow::hasActiveDialogs() const
{
    return modal_ && modal_->isVisible();
}

bool
MainWindow::pageSupportsTray() const
{
    return !welcome_page_->isVisible() && !login_page_->isVisible() && !register_page_->isVisible();
}

void
MainWindow::hideOverlay()
{
    if (modal_)
        modal_->hide();
}

inline void
MainWindow::showDialog(QWidget *dialog)
{
    utils::centerWidget(dialog, this);
    dialog->raise();
    dialog->show();
}

void
MainWindow::showWelcomePage()
{
    removeOverlayProgressBar();
    pageStack_->addWidget(welcome_page_);
    pageStack_->setCurrentWidget(welcome_page_);
}

void
MainWindow::showLoginPage()
{
    if (modal_)
        modal_->hide();

    pageStack_->addWidget(login_page_);
    pageStack_->setCurrentWidget(login_page_);
}

void
MainWindow::showRegisterPage()
{
    pageStack_->addWidget(register_page_);
    pageStack_->setCurrentWidget(register_page_);
}

void
MainWindow::showUserSettingsPage()
{
    pageStack_->setCurrentWidget(userSettingsPage_);
}