/*
 * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
 * Copyright (c) 2022, Matthew Costa <ucosty@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "Tab.h"
#include "BrowserWindow.h"
#include "Settings.h"
#include "Utilities.h"
#include <Browser/History.h>
#include <QCoreApplication>
#include <QFont>
#include <QFontMetrics>
#include <QMenu>
#include <QPainter>
#include <QPlainTextEdit>
#include <QPoint>
#include <QResizeEvent>
#include <QSvgRenderer>

extern DeprecatedString s_serenity_resource_root;
extern Browser::Settings* s_settings;

static QIcon render_svg_icon_with_theme_colors(QString name, QPalette const& palette)
{
    auto path = QString(":/Icons/%1.svg").arg(name);

    QSize icon_size(16, 16);

    QIcon icon;

    auto render = [&](QColor color) -> QPixmap {
        QImage image(icon_size, QImage::Format_ARGB32);
        image.fill(Qt::transparent);

        QPainter painter(&image);
        QSvgRenderer renderer(path);
        renderer.render(&painter);
        painter.setBrush(color);
        painter.setCompositionMode(QPainter::CompositionMode_SourceAtop);
        painter.fillRect(image.rect(), color);
        return QPixmap::fromImage(image);
    };

    icon.addPixmap(render(palette.color(QPalette::ColorGroup::Normal, QPalette::ColorRole::ButtonText)), QIcon::Mode::Normal);
    icon.addPixmap(render(palette.color(QPalette::ColorGroup::Disabled, QPalette::ColorRole::ButtonText)), QIcon::Mode::Disabled);

    return icon;
}

Tab::Tab(BrowserWindow* window, StringView webdriver_content_ipc_path, WebView::EnableCallgrindProfiling enable_callgrind_profiling)
    : QWidget(window)
    , m_window(window)
{
    m_layout = new QBoxLayout(QBoxLayout::Direction::TopToBottom, this);
    m_layout->setSpacing(0);
    m_layout->setContentsMargins(0, 0, 0, 0);

    m_view = new WebContentView(webdriver_content_ipc_path, enable_callgrind_profiling);
    m_toolbar = new QToolBar(this);
    m_location_edit = new LocationEdit(this);
    m_reset_zoom_button = new QToolButton(m_toolbar);

    m_hover_label = new QLabel(this);
    m_hover_label->hide();
    m_hover_label->setFrameShape(QFrame::Shape::Box);
    m_hover_label->setAutoFillBackground(true);

    auto* focus_location_editor_action = new QAction("Edit Location");
    focus_location_editor_action->setShortcut(QKeySequence("Ctrl+L"));
    addAction(focus_location_editor_action);

    m_layout->addWidget(m_toolbar);
    m_layout->addWidget(m_view);

    rerender_toolbar_icons();

    m_toolbar->addAction(&m_window->go_back_action());
    m_toolbar->addAction(&m_window->go_forward_action());
    m_toolbar->addAction(&m_window->reload_action());
    m_toolbar->addWidget(m_location_edit);
    m_reset_zoom_button->setToolTip("Reset zoom level");
    m_reset_zoom_button_action = m_toolbar->addWidget(m_reset_zoom_button);
    m_reset_zoom_button_action->setVisible(false);

    QObject::connect(m_reset_zoom_button, &QAbstractButton::clicked, [this] {
        view().reset_zoom();
        update_reset_zoom_button();
    });

    QObject::connect(m_view, &WebContentView::link_unhovered, [this] {
        m_hover_label->hide();
    });

    QObject::connect(m_view, &WebContentView::activate_tab, [this] {
        m_window->activate_tab(tab_index());
    });

    QObject::connect(m_view, &WebContentView::close, [this] {
        m_window->close_tab(tab_index());
    });

    QObject::connect(m_view, &WebContentView::link_hovered, [this](QString const& title) {
        m_hover_label->setText(title);
        update_hover_label();
        m_hover_label->show();
    });
    QObject::connect(m_view, &WebContentView::link_unhovered, [this] {
        m_hover_label->hide();
    });

    QObject::connect(m_view, &WebContentView::back_mouse_button, [this] {
        back();
    });

    QObject::connect(m_view, &WebContentView::forward_mouse_button, [this] {
        forward();
    });

    QObject::connect(m_view, &WebContentView::load_started, [this](const URL& url, bool is_redirect) {
        // If we are loading due to a redirect, we replace the current history entry
        // with the loaded URL
        if (is_redirect) {
            m_history.replace_current(url, m_title.toUtf8().data());
        }

        m_location_edit->setText(url.to_deprecated_string().characters());
        m_location_edit->setCursorPosition(0);

        // Don't add to history if back or forward is pressed
        if (!m_is_history_navigation) {
            m_history.push(url, m_title.toUtf8().data());
        }
        m_is_history_navigation = false;

        m_window->go_back_action().setEnabled(m_history.can_go_back());
        m_window->go_forward_action().setEnabled(m_history.can_go_forward());
    });
    QObject::connect(m_location_edit, &QLineEdit::returnPressed, this, &Tab::location_edit_return_pressed);
    QObject::connect(m_view, &WebContentView::title_changed, this, &Tab::page_title_changed);
    QObject::connect(m_view, &WebContentView::favicon_changed, this, &Tab::page_favicon_changed);
    QObject::connect(focus_location_editor_action, &QAction::triggered, this, &Tab::focus_location_editor);

    QObject::connect(m_view, &WebContentView::got_source, this, [this](AK::URL, QString const& source) {
        auto* text_edit = new QPlainTextEdit(this);
        text_edit->setWindowFlags(Qt::Window);
        text_edit->setFont(QFontDatabase::systemFont(QFontDatabase::SystemFont::FixedFont));
        text_edit->resize(800, 600);
        text_edit->setPlainText(source);
        text_edit->show();
    });

    QObject::connect(m_view, &WebContentView::navigate_back, this, &Tab::back);
    QObject::connect(m_view, &WebContentView::navigate_forward, this, &Tab::forward);
    QObject::connect(m_view, &WebContentView::refresh, this, &Tab::reload);
    QObject::connect(m_view, &WebContentView::restore_window, this, [this]() {
        m_window->showNormal();
    });
    QObject::connect(m_view, &WebContentView::reposition_window, this, [this](auto const& position) {
        m_window->move(position.x(), position.y());
        return Gfx::IntPoint { m_window->x(), m_window->y() };
    });
    QObject::connect(m_view, &WebContentView::resize_window, this, [this](auto const& size) {
        m_window->resize(size.width(), size.height());
        return Gfx::IntSize { m_window->width(), m_window->height() };
    });
    QObject::connect(m_view, &WebContentView::maximize_window, this, [this]() {
        m_window->showMaximized();
        return Gfx::IntRect { m_window->x(), m_window->y(), m_window->width(), m_window->height() };
    });
    QObject::connect(m_view, &WebContentView::minimize_window, this, [this]() {
        m_window->showMinimized();
        return Gfx::IntRect { m_window->x(), m_window->y(), m_window->width(), m_window->height() };
    });
    QObject::connect(m_view, &WebContentView::fullscreen_window, this, [this]() {
        m_window->showFullScreen();
        return Gfx::IntRect { m_window->x(), m_window->y(), m_window->width(), m_window->height() };
    });

    m_page_context_menu = make<QMenu>("Context menu", this);
    m_page_context_menu->addAction(&m_window->go_back_action());
    m_page_context_menu->addAction(&m_window->go_forward_action());
    m_page_context_menu->addAction(&m_window->reload_action());
    m_page_context_menu->addSeparator();
    m_page_context_menu->addAction(&m_window->copy_selection_action());
    m_page_context_menu->addAction(&m_window->select_all_action());
    m_page_context_menu->addSeparator();
    m_page_context_menu->addAction(&m_window->view_source_action());
    m_page_context_menu->addAction(&m_window->inspect_dom_node_action());

    view().on_context_menu_request = [this](auto widget_position) {
        auto screen_position = mapToGlobal(QPoint { widget_position.x(), widget_position.y() });
        m_page_context_menu->exec(screen_position);
    };
}

void Tab::update_reset_zoom_button()
{
    auto zoom_level = view().zoom_level();
    if (zoom_level != 1.0f) {
        auto zoom_level_text = MUST(String::formatted("{}%", round_to<int>(zoom_level * 100)));
        m_reset_zoom_button->setText(qstring_from_ak_string(zoom_level_text));
        m_reset_zoom_button_action->setVisible(true);
    } else {
        m_reset_zoom_button_action->setVisible(false);
    }
}

void Tab::focus_location_editor()
{
    m_location_edit->setFocus();
    m_location_edit->selectAll();
}

void Tab::navigate(QString url, LoadType load_type)
{
    if (!url.startsWith("http://", Qt::CaseInsensitive) && !url.startsWith("https://", Qt::CaseInsensitive) && !url.startsWith("file://", Qt::CaseInsensitive) && !url.startsWith("about:", Qt::CaseInsensitive))
        url = "http://" + url;
    m_is_history_navigation = (load_type == LoadType::HistoryNavigation);
    view().load(ak_deprecated_string_from_qstring(url));
}

void Tab::back()
{
    if (!m_history.can_go_back())
        return;

    m_is_history_navigation = true;
    m_history.go_back();
    view().load(m_history.current().url.to_deprecated_string());
}

void Tab::forward()
{
    if (!m_history.can_go_forward())
        return;

    m_is_history_navigation = true;
    m_history.go_forward();
    view().load(m_history.current().url.to_deprecated_string());
}

void Tab::reload()
{
    m_is_history_navigation = true;
    view().load(m_history.current().url.to_deprecated_string());
}

void Tab::location_edit_return_pressed()
{
    navigate(m_location_edit->text());
}

void Tab::page_title_changed(QString title)
{
    m_title = title;
    m_history.update_title(ak_deprecated_string_from_qstring(m_title));
    emit title_changed(tab_index(), std::move(title));
}

void Tab::page_favicon_changed(QIcon icon)
{
    emit favicon_changed(tab_index(), std::move(icon));
}

int Tab::tab_index()
{
    return m_window->tab_index(this);
}

void Tab::debug_request(DeprecatedString const& request, DeprecatedString const& argument)
{
    if (request == "dump-history")
        m_history.dump();
    else
        m_view->debug_request(request, argument);
}

void Tab::resizeEvent(QResizeEvent* event)
{
    QWidget::resizeEvent(event);
    if (m_hover_label->isVisible())
        update_hover_label();
}

void Tab::update_hover_label()
{
    m_hover_label->resize(QFontMetrics(m_hover_label->font()).boundingRect(m_hover_label->text()).adjusted(-4, -2, 4, 2).size());
    m_hover_label->move(6, height() - m_hover_label->height() - 8);
    m_hover_label->raise();
}

bool Tab::event(QEvent* event)
{
    if (event->type() == QEvent::PaletteChange) {
        rerender_toolbar_icons();
        return QWidget::event(event);
    }

    return QWidget::event(event);
}

void Tab::rerender_toolbar_icons()
{
    m_window->go_back_action().setIcon(render_svg_icon_with_theme_colors("back", palette()));
    m_window->go_forward_action().setIcon(render_svg_icon_with_theme_colors("forward", palette()));
    m_window->reload_action().setIcon(render_svg_icon_with_theme_colors("reload", palette()));
}