/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "platform/linux/main_window_linux.h"

#include "styles/style_window.h"
#include "platform/linux/specific_linux.h"
#include "platform/linux/linux_wayland_integration.h"
#include "history/history.h"
#include "history/history_widget.h"
#include "history/history_inner_widget.h"
#include "main/main_account.h" // Account::sessionChanges.
#include "main/main_session.h"
#include "mainwindow.h"
#include "core/application.h"
#include "core/core_settings.h"
#include "core/sandbox.h"
#include "boxes/peer_list_controllers.h"
#include "boxes/about_box.h"
#include "lang/lang_keys.h"
#include "storage/localstorage.h"
#include "window/window_controller.h"
#include "window/window_session_controller.h"
#include "base/platform/base_platform_info.h"
#include "base/event_filter.h"
#include "ui/widgets/popup_menu.h"
#include "ui/widgets/input_fields.h"
#include "ui/ui_utility.h"

#ifndef DESKTOP_APP_DISABLE_DBUS_INTEGRATION
#include "base/platform/linux/base_linux_glibmm_helper.h"
#endif // !DESKTOP_APP_DISABLE_DBUS_INTEGRATION

#ifndef DESKTOP_APP_DISABLE_X11_INTEGRATION
#include "base/platform/linux/base_linux_xcb_utilities.h"
#endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION

#include <QtCore/QSize>
#include <QtCore/QMimeData>
#include <QtGui/QWindow>
#include <QtWidgets/QMenuBar>

#ifndef DESKTOP_APP_DISABLE_DBUS_INTEGRATION
#include <glibmm.h>
#include <giomm.h>
#endif // !DESKTOP_APP_DISABLE_DBUS_INTEGRATION

namespace Platform {
namespace {

using internal::WaylandIntegration;
using WorkMode = Core::Settings::WorkMode;

#ifndef DESKTOP_APP_DISABLE_X11_INTEGRATION
void XCBSkipTaskbar(QWindow *window, bool skip) {
	const auto connection = base::Platform::XCB::GetConnectionFromQt();
	if (!connection) {
		return;
	}

	const auto root = base::Platform::XCB::GetRootWindow(connection);
	if (!root.has_value()) {
		return;
	}

	const auto stateAtom = base::Platform::XCB::GetAtom(
		connection,
		"_NET_WM_STATE");

	if (!stateAtom.has_value()) {
		return;
	}

	const auto skipTaskbarAtom = base::Platform::XCB::GetAtom(
		connection,
		"_NET_WM_STATE_SKIP_TASKBAR");

	if (!skipTaskbarAtom.has_value()) {
		return;
	}

	xcb_client_message_event_t xev;
	xev.response_type = XCB_CLIENT_MESSAGE;
	xev.type = *stateAtom;
	xev.sequence = 0;
	xev.window = window->winId();
	xev.format = 32;
	xev.data.data32[0] = skip ? 1 : 0;
	xev.data.data32[1] = *skipTaskbarAtom;
	xev.data.data32[2] = 0;
	xev.data.data32[3] = 0;
	xev.data.data32[4] = 0;

	xcb_send_event(
		connection,
		false,
		*root,
		XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT
			| XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY,
		reinterpret_cast<const char*>(&xev));
}

void XCBSetDesktopFileName(QWindow *window) {
	const auto connection = base::Platform::XCB::GetConnectionFromQt();
	if (!connection) {
		return;
	}

	const auto utf8Atom = base::Platform::XCB::GetAtom(
		connection,
		"UTF8_STRING");

	if (!utf8Atom.has_value()) {
		return;
	}

	const auto filenameAtoms = {
		base::Platform::XCB::GetAtom(connection, "_GTK_APPLICATION_ID"),
		base::Platform::XCB::GetAtom(connection, "_KDE_NET_WM_DESKTOP_FILE"),
	};

	const auto filename = QGuiApplication::desktopFileName()
		.chopped(8)
		.toUtf8();

	for (const auto atom : filenameAtoms) {
		if (atom.has_value()) {
			xcb_change_property(
				connection,
				XCB_PROP_MODE_REPLACE,
				window->winId(),
				*atom,
				*utf8Atom,
				8,
				filename.size(),
				filename.data());
		}
	}
}
#endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION

void SkipTaskbar(QWindow *window, bool skip) {
	if (const auto integration = WaylandIntegration::Instance()) {
		integration->skipTaskbar(window, skip);
	}

#ifndef DESKTOP_APP_DISABLE_X11_INTEGRATION
	if (IsX11()) {
		XCBSkipTaskbar(window, skip);
	}
#endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION
}

void SendKeySequence(
	Qt::Key key,
	Qt::KeyboardModifiers modifiers = Qt::NoModifier) {
	const auto focused = static_cast<QObject*>(QApplication::focusWidget());
	if (qobject_cast<QLineEdit*>(focused)
		|| qobject_cast<QTextEdit*>(focused)
		|| dynamic_cast<HistoryInner*>(focused)) {
		QKeyEvent pressEvent(QEvent::KeyPress, key, modifiers);
		focused->event(&pressEvent);
		QKeyEvent releaseEvent(QEvent::KeyRelease, key, modifiers);
		focused->event(&releaseEvent);
	}
}

void ForceDisabled(QAction *action, bool disabled) {
	if (action->isEnabled()) {
		if (disabled) action->setDisabled(true);
	} else if (!disabled) {
		action->setDisabled(false);
	}
}

#ifndef DESKTOP_APP_DISABLE_DBUS_INTEGRATION
uint djbStringHash(const std::string &string) {
	uint hash = 5381;
	for (const auto &curChar : string) {
		hash = (hash << 5) + hash + curChar;
	}
	return hash;
}
#endif // !DESKTOP_APP_DISABLE_DBUS_INTEGRATION

} // namespace

MainWindow::MainWindow(not_null<Window::Controller*> controller)
: Window::MainWindow(controller) {
}

void MainWindow::initHook() {
	base::install_event_filter(windowHandle(), [=](not_null<QEvent*> e) {
		if (e->type() == QEvent::Expose) {
			auto ee = static_cast<QExposeEvent*>(e.get());
			if (ee->region().isNull()) {
				return base::EventFilterResult::Continue;
			}
			if (!windowHandle()
				|| windowHandle()->parent()
				|| !windowHandle()->isVisible()) {
				return base::EventFilterResult::Continue;
			}
			handleNativeSurfaceChanged(true);
		} else if (e->type() == QEvent::Hide) {
			if (!windowHandle() || windowHandle()->parent()) {
				return base::EventFilterResult::Continue;
			}
			handleNativeSurfaceChanged(false);
		}
		return base::EventFilterResult::Continue;
	});

#ifndef DESKTOP_APP_DISABLE_X11_INTEGRATION
	XCBSetDesktopFileName(windowHandle());
#endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION
}

void MainWindow::workmodeUpdated(Core::Settings::WorkMode mode) {
	if (!TrayIconSupported()) {
		return;
	}

	SkipTaskbar(windowHandle(), mode == WorkMode::TrayOnly);
}

void MainWindow::unreadCounterChangedHook() {
	updateIconCounters();
}

void MainWindow::updateIconCounters() {
	updateWindowIcon();

#ifndef DESKTOP_APP_DISABLE_DBUS_INTEGRATION
	const auto launcherUrl = Glib::ustring(
		"application://"
			+ QGuiApplication::desktopFileName().toStdString());
	const auto counterSlice = std::min(Core::App().unreadBadge(), 9999);
	std::map<Glib::ustring, Glib::VariantBase> dbusUnityProperties;

	if (counterSlice > 0) {
		// According to the spec, it should be of 'x' D-Bus signature,
		// which corresponds to signed 64-bit integer
		// https://wiki.ubuntu.com/Unity/LauncherAPI#Low_level_DBus_API:_com.canonical.Unity.LauncherEntry
		dbusUnityProperties["count"] = Glib::Variant<int64>::create(
			counterSlice);
		dbusUnityProperties["count-visible"] =
			Glib::Variant<bool>::create(true);
	} else {
		dbusUnityProperties["count-visible"] =
			Glib::Variant<bool>::create(false);
	}

	try {
		const auto connection = Gio::DBus::Connection::get_sync(
			Gio::DBus::BusType::SESSION);

		connection->emit_signal(
			"/com/canonical/unity/launcherentry/"
				+ std::to_string(djbStringHash(launcherUrl)),
			"com.canonical.Unity.LauncherEntry",
			"Update",
			{},
			base::Platform::MakeGlibVariant(std::tuple{
				launcherUrl,
				dbusUnityProperties,
			}));
	} catch (...) {
	}
#endif // !DESKTOP_APP_DISABLE_DBUS_INTEGRATION
}

void MainWindow::createGlobalMenu() {
	const auto ensureWindowShown = [=] {
		if (isHidden()) {
			showFromTray();
		}
	};

	psMainMenu = new QMenuBar(this);
	psMainMenu->hide();

	auto file = psMainMenu->addMenu(tr::lng_mac_menu_file(tr::now));

	psLogout = file->addAction(
		tr::lng_mac_menu_logout(tr::now),
		this,
		[=] {
			ensureWindowShown();
			controller().showLogoutConfirmation();
		});

	auto quit = file->addAction(
		tr::lng_mac_menu_quit_telegram(tr::now, lt_telegram, u"Telegram"_q),
		this,
		[=] { quitFromTray(); },
		QKeySequence::Quit);

	quit->setMenuRole(QAction::QuitRole);

	auto edit = psMainMenu->addMenu(tr::lng_mac_menu_edit(tr::now));

	psUndo = edit->addAction(
		tr::lng_linux_menu_undo(tr::now),
		[] { SendKeySequence(Qt::Key_Z, Qt::ControlModifier); },
		QKeySequence::Undo);

	psRedo = edit->addAction(
		tr::lng_linux_menu_redo(tr::now),
		[] {
			SendKeySequence(
				Qt::Key_Z,
				Qt::ControlModifier | Qt::ShiftModifier);
		},
		QKeySequence::Redo);

	edit->addSeparator();

	psCut = edit->addAction(
		tr::lng_mac_menu_cut(tr::now),
		[] { SendKeySequence(Qt::Key_X, Qt::ControlModifier); },
		QKeySequence::Cut);

	psCopy = edit->addAction(
		tr::lng_mac_menu_copy(tr::now),
		[] { SendKeySequence(Qt::Key_C, Qt::ControlModifier); },
		QKeySequence::Copy);

	psPaste = edit->addAction(
		tr::lng_mac_menu_paste(tr::now),
		[] { SendKeySequence(Qt::Key_V, Qt::ControlModifier); },
		QKeySequence::Paste);

	psDelete = edit->addAction(
		tr::lng_mac_menu_delete(tr::now),
		[] { SendKeySequence(Qt::Key_Delete); },
		QKeySequence(Qt::ControlModifier | Qt::Key_Backspace));

	edit->addSeparator();

	psBold = edit->addAction(
		tr::lng_menu_formatting_bold(tr::now),
		[] { SendKeySequence(Qt::Key_B, Qt::ControlModifier); },
		QKeySequence::Bold);

	psItalic = edit->addAction(
		tr::lng_menu_formatting_italic(tr::now),
		[] { SendKeySequence(Qt::Key_I, Qt::ControlModifier); },
		QKeySequence::Italic);

	psUnderline = edit->addAction(
		tr::lng_menu_formatting_underline(tr::now),
		[] { SendKeySequence(Qt::Key_U, Qt::ControlModifier); },
		QKeySequence::Underline);

	psStrikeOut = edit->addAction(
		tr::lng_menu_formatting_strike_out(tr::now),
		[] {
			SendKeySequence(
				Qt::Key_X,
				Qt::ControlModifier | Qt::ShiftModifier);
		},
		Ui::kStrikeOutSequence);

	psMonospace = edit->addAction(
		tr::lng_menu_formatting_monospace(tr::now),
		[] {
			SendKeySequence(
				Qt::Key_M,
				Qt::ControlModifier | Qt::ShiftModifier);
		},
		Ui::kMonospaceSequence);

	psClearFormat = edit->addAction(
		tr::lng_menu_formatting_clear(tr::now),
		[] {
			SendKeySequence(
				Qt::Key_N,
				Qt::ControlModifier | Qt::ShiftModifier);
		},
		Ui::kClearFormatSequence);

	edit->addSeparator();

	psSelectAll = edit->addAction(
		tr::lng_mac_menu_select_all(tr::now),
		[] { SendKeySequence(Qt::Key_A, Qt::ControlModifier); },
		QKeySequence::SelectAll);

	edit->addSeparator();

	auto prefs = edit->addAction(
		tr::lng_mac_menu_preferences(tr::now),
		this,
		[=] {
			ensureWindowShown();
			controller().showSettings();
		},
		QKeySequence(Qt::ControlModifier | Qt::Key_Comma));

	prefs->setMenuRole(QAction::PreferencesRole);

	auto tools = psMainMenu->addMenu(tr::lng_linux_menu_tools(tr::now));

	psContacts = tools->addAction(
		tr::lng_mac_menu_contacts(tr::now),
		crl::guard(this, [=] {
			if (isHidden()) {
				showFromTray();
			}

			if (!sessionController()) {
				return;
			}

			sessionController()->show(
				PrepareContactsBox(sessionController()));
		}));

	psAddContact = tools->addAction(
		tr::lng_mac_menu_add_contact(tr::now),
		this,
		[=] {
			Expects(sessionController() != nullptr);
			ensureWindowShown();
			sessionController()->showAddContact();
		});

	tools->addSeparator();

	psNewGroup = tools->addAction(
		tr::lng_mac_menu_new_group(tr::now),
		this,
		[=] {
			Expects(sessionController() != nullptr);
			ensureWindowShown();
			sessionController()->showNewGroup();
		});

	psNewChannel = tools->addAction(
		tr::lng_mac_menu_new_channel(tr::now),
		this,
		[=] {
			Expects(sessionController() != nullptr);
			ensureWindowShown();
			sessionController()->showNewChannel();
		});

	auto help = psMainMenu->addMenu(tr::lng_linux_menu_help(tr::now));

	auto about = help->addAction(
		tr::lng_mac_menu_about_telegram(
			tr::now,
			lt_telegram,
			u"Telegram"_q),
		[=] {
			ensureWindowShown();
			controller().show(Box<AboutBox>());
		});

	about->setMenuRole(QAction::AboutQtRole);

	updateGlobalMenu();
}

void MainWindow::updateGlobalMenuHook() {
	if (!positionInited()) {
		return;
	}

	const auto focused = QApplication::focusWidget();
	auto canUndo = false;
	auto canRedo = false;
	auto canCut = false;
	auto canCopy = false;
	auto canPaste = false;
	auto canDelete = false;
	auto canSelectAll = false;
	const auto mimeData = QGuiApplication::clipboard()->mimeData();
	const auto clipboardHasText = mimeData ? mimeData->hasText() : false;
	auto markdownEnabled = false;
	if (const auto edit = qobject_cast<QLineEdit*>(focused)) {
		canCut = canCopy = canDelete = edit->hasSelectedText();
		canSelectAll = !edit->text().isEmpty();
		canUndo = edit->isUndoAvailable();
		canRedo = edit->isRedoAvailable();
		canPaste = clipboardHasText;
	} else if (const auto edit = qobject_cast<QTextEdit*>(focused)) {
		canCut = canCopy = canDelete = edit->textCursor().hasSelection();
		canSelectAll = !edit->document()->isEmpty();
		canUndo = edit->document()->isUndoAvailable();
		canRedo = edit->document()->isRedoAvailable();
		canPaste = clipboardHasText;
		if (canCopy) {
			if (const auto inputField = dynamic_cast<Ui::InputField*>(
				focused->parentWidget())) {
				markdownEnabled = inputField->isMarkdownEnabled();
			}
		}
	} else if (const auto list = dynamic_cast<HistoryInner*>(focused)) {
		canCopy = list->canCopySelected();
		canDelete = list->canDeleteSelected();
	}
	updateIsActive();
	const auto logged = (sessionController() != nullptr);
	const auto inactive = !logged || controller().locked();
	const auto support = logged
		&& sessionController()->session().supportMode();
	ForceDisabled(psLogout, !logged && !Core::App().passcodeLocked());
	ForceDisabled(psUndo, !canUndo);
	ForceDisabled(psRedo, !canRedo);
	ForceDisabled(psCut, !canCut);
	ForceDisabled(psCopy, !canCopy);
	ForceDisabled(psPaste, !canPaste);
	ForceDisabled(psDelete, !canDelete);
	ForceDisabled(psSelectAll, !canSelectAll);
	ForceDisabled(psContacts, inactive || support);
	ForceDisabled(psAddContact, inactive);
	ForceDisabled(psNewGroup, inactive || support);
	ForceDisabled(psNewChannel, inactive || support);

	ForceDisabled(psBold, !markdownEnabled);
	ForceDisabled(psItalic, !markdownEnabled);
	ForceDisabled(psUnderline, !markdownEnabled);
	ForceDisabled(psStrikeOut, !markdownEnabled);
	ForceDisabled(psMonospace, !markdownEnabled);
	ForceDisabled(psClearFormat, !markdownEnabled);
}

bool MainWindow::eventFilter(QObject *obj, QEvent *evt) {
	const auto t = evt->type();
	if (t == QEvent::FocusIn || t == QEvent::FocusOut) {
		if (qobject_cast<QLineEdit*>(obj)
			|| qobject_cast<QTextEdit*>(obj)
			|| dynamic_cast<HistoryInner*>(obj)) {
			if (QApplication::focusWidget()) {
				updateGlobalMenu();
			}
		}
	}
	return Window::MainWindow::eventFilter(obj, evt);
}

void MainWindow::handleNativeSurfaceChanged(bool exist) {
	if (exist) {
		SkipTaskbar(
			windowHandle(),
			(Core::App().settings().workMode() == WorkMode::TrayOnly)
				&& TrayIconSupported());
	}
}

MainWindow::~MainWindow() {
}

} // namespace Platform