/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: git://neueland.iserlohn-fortress.net/smolbote.git
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#include "mainwindow.h"
#include "browser.h"
#include "forms/aboutdialog.h"
#include "forms/searchform.h"
#include "ui_mainwindow.h"
#include "widgets/mainwindowmenubar.h"
#include <QDockWidget>
#include <QMessageBox>
#include <bookmarks/bookmarkswidget.h>
#include <downloads/downloadswidget.h>
#include <navigation/urllineedit.h>
#include <settings/settingsdialog.h>

MainWindow::MainWindow(std::shared_ptr<Configuration> config, QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    , tabBar(new MainWindowTabBar(config, this))
    , menuBar(new MainWindowMenuBar(config, this))
    , m_addressBar(new UrlLineEdit(this))
    , m_progressBar(new LoadingBar(this))
{
    Q_ASSERT(config);
    m_config = config;

    // delete this window when it closes
    setAttribute(Qt::WA_DeleteOnClose, true);

    // set up UI
    ui->setupUi(this);

    QAction *fullscreenAction = new QAction(this);
    fullscreenAction->setShortcut(QKeySequence(QString::fromStdString(m_config->value<std::string>("browser.shortcuts.fullscreen").value())));
    connect(fullscreenAction, &QAction::triggered, this, &MainWindow::toggleFullscreen);
    addAction(fullscreenAction);

    // Dockable widget styling
    setDockOptions(dockOptions() | AllowTabbedDocks | ForceTabbedDocks);
    setTabPosition(Qt::LeftDockWidgetArea, QTabWidget::North);
    setTabPosition(Qt::RightDockWidgetArea, QTabWidget::North);

    // Add the toolbars
    // tabToolBar: main menu and tab list
    ui->mainToolBar->setMovable(m_config->value<bool>("browser.ui.tabtoolbarMovable").value());
    ui->mainToolBar->addWidget(menuBar);
    //tabToolBar->addWidget(tabBar);

    // navigationToolBar: address bar
    ui->navigationToolBar->setMovable(m_config->value<bool>("browser.ui.navtoolbarMovable").value());
    insertToolBarBreak(ui->navigationToolBar);

    // page actions
    m_backButton = new NavigationButton(NavigationButton::BackButton, this);

    m_forwardButton = new NavigationButton(NavigationButton::ForwardButton, this);

    m_reloadButton = new NavigationButton(NavigationButton::ReloadButton, this);

    QToolButton *homepageButton = new QToolButton(this);
    homepageButton->setIcon(style()->standardIcon(QStyle::SP_DirHomeIcon));
    connect(homepageButton, &QToolButton::clicked, this, [&]() {
        tabBar->currentView()->load(m_profile->homepage());
    });

    ui->navigationToolBar->addWidget(m_backButton);
    ui->navigationToolBar->addWidget(m_forwardButton);
    ui->navigationToolBar->addWidget(m_reloadButton);
    ui->navigationToolBar->addWidget(homepageButton);
    ui->navigationToolBar->addWidget(m_addressBar);

    // connect signals
    connect(m_addressBar, &UrlLineEdit::addressEntered, this, [&](const QUrl &url) {
        tabBar->currentView()->load(url);
    });
    connect(m_addressBar, &UrlLineEdit::searchTermEntered, this, [&](const QString &term) {
        QString t = term;
        t.replace(' ', '+');
        QString url = QString::fromStdString(m_config->value<std::string>("profile.search").value());
        url.replace("$term", t);
        tabBar->currentView()->load(QUrl::fromUserInput(url));
    });
    connect(tabBar, &MainWindowTabBar::currentTabChanged, this, &MainWindow::handleTabChanged);
    //connect(tabBar, SIGNAL(currentTabChanged(WebView *)), this, SLOT(handleTabChanged(WebView *)));

    // loading bar
    ui->statusBar->addPermanentWidget(m_progressBar);

    // search box
    m_searchBox = new SearchForm(this);
    ui->statusBar->addWidget(m_searchBox);
    m_searchBox->setVisible(false);

    // shortcuts
    QAction *focusAddressAction = new QAction(this);
    focusAddressAction->setShortcut(QKeySequence(QString::fromStdString(m_config->value<std::string>("browser.shortcuts.focusAddress").value())));
    //focusAddressAction->setShortcut(QKeySequence::fromString(browser->settings()->value("window.shortcuts.focusAddress").toString()));
    //connect(focusAddressAction, SIGNAL(triggered(bool)), this, SLOT(focusAddress()));
    connect(focusAddressAction, &QAction::triggered, this, [this]() {
        m_addressBar->setFocus();
        m_addressBar->selectAll();
    });
    addAction(focusAddressAction);

    resize(m_config->value<int>("browser.window.width").value(), m_config->value<int>("browser.window.height").value());
    if(m_config->value<bool>("browser.window.maximized").value()) {
        showMaximized();
    }
}

MainWindow::~MainWindow()
{
    // Release all dock widgets before deleting so we don't accidentally delete them
    // Also fixes that annoying crash when closing
    QList<QDockWidget *> allDockWidgets = findChildren<QDockWidget *>();
    for(QDockWidget *w : allDockWidgets) {
        if(w->widget()) {
            w->widget()->setParent(nullptr);
        }
    }

    delete ui;
}

void MainWindow::addTabbedDock(Qt::DockWidgetArea area, QWidget *widget)
{
    // make a list of widgets in the area we want
    // this way we can append the new dock widget to the last one
    QVector<QDockWidget *> areaDockWidgets;
    for(QDockWidget *w : findChildren<QDockWidget *>()) {
        // check if widget is already shown
        if(w->widget() == widget) {
            // in this case, close the dock and return
            w->close();
            return;
        }

        if(dockWidgetArea(w) == area) {
            areaDockWidgets.append(w);
        }
    }

    // create a dock widget
    QDockWidget *dock = new QDockWidget(widget->windowTitle(), this);
    dock->setAttribute(Qt::WA_DeleteOnClose, true);

    // when the dock widget becomes invisble, release the docked widget
    // setting the widget makes the dock its parent; setting parent back to nullptr
    // makes the dock not show the widget any more
    connect(dock, &QDockWidget::visibilityChanged, [dock](bool visible) {
        if(!visible && dock->widget()) {
            dock->widget()->setParent(nullptr);
        }
    });
    dock->setWidget(widget);

    // the same widget may be shown by docks in other windows
    // in that case, they grab ownership and the current dock won't be showing anything
    // so the current widget needs to be closed
    auto *w = dynamic_cast<BookmarksWidget *>(widget);
    w->closeOthers();
    if(w) {
        connect(w, &BookmarksWidget::closeOthersSignal, dock, [dock]() {
            dock->close();
        });
    }

    if(areaDockWidgets.empty()) {
        // no other widgets
        addDockWidget(area, dock);
    } else {
        // there are other widgets, so put it after the last one
        tabifyDockWidget(areaDockWidgets.last(), dock);
    }
}

void MainWindow::newTab(const QUrl &url)
{
    if(!m_tabBarAdded) {
        m_tabBarAdded = true;
        ui->mainToolBar->addWidget(tabBar);
    }
    tabBar->addTab(createWebView(url, m_profile.get(), this));
}

MainWindow *MainWindow::newWindow(const QUrl &url)
{
    Browser *instance = static_cast<Browser *>(qApp->instance());
    return instance->createSession(m_profile->storageName(), true, QStringList(url.toString()));
}

void MainWindow::closeEvent(QCloseEvent *event)
{
    if(tabBar->count() > 1) {
        int ret = QMessageBox::warning(this, tr("Close window?"), tr("Close multiple tabs?"), QMessageBox::Yes | QMessageBox::No, QMessageBox::No);
        if(ret == QMessageBox::No) {
            event->ignore();
            return;
        }
    }
    QMainWindow::closeEvent(event);
}

void MainWindow::about()
{
    AboutDialog *dlg = new AboutDialog(this);
    dlg->exec();
}

void MainWindow::showSettingsDialog()
{
    SettingsDialog *dlg = new SettingsDialog(m_config, this);
    dlg->exec();
}

void MainWindow::setProfile(std::shared_ptr<WebEngineProfile> profile)
{
    Q_ASSERT(profile);
    m_profile = profile;
    tabBar->setProfile(profile.get());
    menuBar->setProfileName(profile->name());
}

WebEngineProfile *MainWindow::profile()
{
    Q_ASSERT(m_profile);
    return m_profile.get();
}

void MainWindow::setBookmarksWidget(std::shared_ptr<BookmarksWidget> &widget)
{
    Q_ASSERT(widget);
    m_bookmarksWidget = widget;
    m_addressBar->setCompleterModel(m_bookmarksWidget->model());
    connect(menuBar->bookmarksAction(), &QAction::triggered, this, [this]() {
        addTabbedDock(Qt::RightDockWidgetArea, m_bookmarksWidget.get());
    });
    connect(m_bookmarksWidget.get(), &BookmarksWidget::openUrl, this, [this](const QUrl &url) {
        if(isActiveWindow()) {
            newTab(url);
        }
    });
}

void MainWindow::setDownloadsWidget(std::shared_ptr<DownloadsWidget> &widget)
{
    Q_ASSERT(widget);
    m_downloadsWidget = widget;
}

void MainWindow::toggleFullscreen()
{
    if(isFullScreen()) {
        setWindowState(Qt::WindowMaximized | Qt::WindowActive);
    } else {
        setWindowState(Qt::WindowFullScreen | Qt::WindowActive);
    }
}

void MainWindow::handleTabChanged(WebView *view)
{
    Q_CHECK_PTR(view);

    m_currentView = view;

    // centralWidget can be a nullptr
    if(centralWidget()) {
        // clear the parent of the central widget so it doesn't get deleted
        centralWidget()->setParent(nullptr);

        // disconnect signals
        disconnect(centralWidget());
    }

    // set new central widget
    setCentralWidget(view);

    // connect signals
    m_backButton->setView(view);
    m_forwardButton->setView(view);
    m_reloadButton->setView(view);

    connect(view, &WebView::urlChanged, m_addressBar, &UrlLineEdit::setUrl);
    m_addressBar->setUrl(view->url());
    m_addressBar->pageAction()->setMenu(view->pageMenu());

    connect(view, &WebView::titleChanged, this, &MainWindow::handleTitleUpdated);

    m_progressBar->connectWebView(view);

    // update UI
    this->handleTitleUpdated(view->title());
    centralWidget()->setFocus();
}

void MainWindow::handleTitleUpdated(const QString &title)
{
    QString t = QString::fromStdString(m_config->value<std::string>("browser.window.title").value());
    t.replace("title", title);
    t.replace("profile", m_profile->name());
    setWindowTitle(t);
    //setWindowTitle(browser->settings()->value("window.title").toString().replace("title", title).replace("profile", tabBar->profile()->name()));
}

void MainWindow::addPlugins(QVector<PluginInterface *> &plugins) {
    for(PluginInterface *plugin : plugins) {
        ProfileInterface *profilePlugin = dynamic_cast<ProfileInterface *>(plugin);
        QWidget *w = profilePlugin->createWidget(m_profile.get(), this);

        QAction *profileAction = new QAction(this);
        profileAction->setText("Profile Action");
        ui->navigationToolBar->addAction(profileAction);
        connect(profileAction, &QAction::triggered, this, [this, w]() {
            w->setVisible(!w->isVisible());
            if(w->isVisible()) {
                w->adjustSize();
                QPoint pos = ui->navigationToolBar->pos();
                pos.setX(pos.x() + ui->navigationToolBar->width() - w->width());
                pos.setY(pos.y() + ui->navigationToolBar->height());
                w->move(mapToGlobal(pos));
                w->show();
            }
        });
    }
}