/*
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/integration_linux.h"

#include "platform/platform_integration.h"
#include "base/platform/base_platform_info.h"
#include "base/platform/linux/base_linux_xdp_utilities.h"
#include "core/sandbox.h"
#include "core/application.h"
#include "core/core_settings.h"
#include "base/random.h"

#include <QtCore/QAbstractEventDispatcher>
#include <qpa/qwindowsysteminterface.h>

#include <glibmm.h>
#include <gio/gio.hpp>
#include <xdpinhibit/xdpinhibit.hpp>

namespace Platform {
namespace {

using namespace gi::repository;

class Application : public Gio::impl::ApplicationImpl {
public:
	Application();

	void before_emit_(GLib::Variant platformData) noexcept override {
		if (Platform::IsWayland()) {
			static const auto keys = {
				"activation-token",
				"desktop-startup-id",
			};
			for (const auto &key : keys) {
				if (auto token = platformData.lookup_value(key)) {
					qputenv(
						"XDG_ACTIVATION_TOKEN",
						token.get_string(nullptr).c_str());
					break;
				}
			}
		}
	}

	void activate_() noexcept override {
		Core::Sandbox::Instance().customEnterFromEventLoop([] {
			Core::App().activate();
		});
	}

	void open_(GFile **files, int n_files, const char*) noexcept override {
		Core::Sandbox::Instance().customEnterFromEventLoop([&] {
			for (int i = 0; i < n_files; ++i) {
				QFileOpenEvent e(
					QUrl(QString::fromUtf8(g_file_get_uri(files[i]))));
				QGuiApplication::sendEvent(qApp, &e);
			}
		});
	}

	void add_platform_data_(GLib::VariantBuilder builder) noexcept override {
		if (Platform::IsWayland()) {
			const auto token = qgetenv("XDG_ACTIVATION_TOKEN");
			if (!token.isEmpty()) {
				builder.add_value(
					GLib::Variant::new_dict_entry(
						GLib::Variant::new_string("activation-token"),
						GLib::Variant::new_variant(
							GLib::Variant::new_string(token.toStdString()))));
				qunsetenv("XDG_ACTIVATION_TOKEN");
			}
		}
	}
};

Application::Application()
: Gio::impl::ApplicationImpl(this) {
	const auto appId = QGuiApplication::desktopFileName().toStdString();
	if (Gio::Application::id_is_valid(appId)) {
		set_application_id(appId);
	}
	set_flags(Gio::ApplicationFlags::HANDLES_OPEN_);

	auto actionMap = Gio::ActionMap(*this);

	auto quitAction = Gio::SimpleAction::new_("quit");
	quitAction.signal_activate().connect([](
			Gio::SimpleAction,
			GLib::Variant parameter) {
		Core::Sandbox::Instance().customEnterFromEventLoop([] {
			Core::Quit();
		});
	});
	actionMap.add_action(quitAction);

	using Window::Notifications::Manager;
	using NotificationId = Manager::NotificationId;
	using NotificationIdTuple = std::invoke_result_t<
		decltype(&NotificationId::toTuple),
		NotificationId*
	>;

	const auto notificationIdVariantType = [] {
		try {
			return gi::wrap(
				Glib::create_variant(
					NotificationId().toTuple()
				).get_type().gobj_copy(),
				gi::transfer_full,
				gi::direction_out
			);
		} catch (...) {
			return GLib::VariantType();
		}
	}();

	auto notificationActivateAction = Gio::SimpleAction::new_(
		"notification-activate",
		notificationIdVariantType);

	notificationActivateAction.signal_activate().connect([](
			Gio::SimpleAction,
			GLib::Variant parameter) {
		Core::Sandbox::Instance().customEnterFromEventLoop([&] {
			try {
				const auto &app = Core::App();
				app.notifications().manager().notificationActivated(
					NotificationId::FromTuple(
						Glib::wrap(
							parameter.gobj_copy_()
						).get_dynamic<NotificationIdTuple>()
					)
				);
			} catch (...) {
			}
		});
	});

	actionMap.add_action(notificationActivateAction);

	auto notificationMarkAsReadAction = Gio::SimpleAction::new_(
		"notification-mark-as-read",
		notificationIdVariantType);

	notificationMarkAsReadAction.signal_activate().connect([](
			Gio::SimpleAction,
			GLib::Variant parameter) {
		Core::Sandbox::Instance().customEnterFromEventLoop([&] {
			try {
				const auto &app = Core::App();
				app.notifications().manager().notificationReplied(
					NotificationId::FromTuple(
						Glib::wrap(
							parameter.gobj_copy_()
						).get_dynamic<NotificationIdTuple>()
					),
					{}
				);
			} catch (...) {
			}
		});
	});

	actionMap.add_action(notificationMarkAsReadAction);
}

gi::ref_ptr<Application> MakeApplication() {
	const auto result = gi::make_ref<Application>();
	if (const auto registered = result->register_(); !registered) {
		LOG(("App Error: Failed to register: %1").arg(
			QString::fromStdString(registered.error().message_())));
		return nullptr;
	}
	return result;
}

class LinuxIntegration final : public Integration {
public:
	LinuxIntegration();

	void init() override;

private:
	[[nodiscard]] XdpInhibit::Inhibit inhibit() {
		return _inhibitProxy;
	}

	void initInhibit();

	const gi::ref_ptr<Application> _application;
	XdpInhibit::InhibitProxy _inhibitProxy;
	base::Platform::XDP::SettingWatcher _darkModeWatcher;
};

LinuxIntegration::LinuxIntegration()
: _application(MakeApplication())
, _inhibitProxy(
	XdpInhibit::InhibitProxy::new_for_bus_sync(
		Gio::BusType::SESSION_,
		Gio::DBusProxyFlags::DO_NOT_AUTO_START_AT_CONSTRUCTION_,
		base::Platform::XDP::kService,
		base::Platform::XDP::kObjectPath,
		nullptr))
, _darkModeWatcher([](
	const Glib::ustring &group,
	const Glib::ustring &key,
	const Glib::VariantBase &value) {
	if (group == "org.freedesktop.appearance"
		&& key == "color-scheme") {
#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
		QWindowSystemInterface::handleThemeChange();
#else // Qt >= 6.5.0
		Core::Sandbox::Instance().customEnterFromEventLoop([&] {
			try {
				Core::App().settings().setSystemDarkMode(
					value.get_dynamic<uint>() == 1);
			} catch (...) {
			}
		});
#endif // Qt < 6.5.0
	}
}) {
	LOG(("Icon theme: %1").arg(QIcon::themeName()));
	LOG(("Fallback icon theme: %1").arg(QIcon::fallbackThemeName()));

	if (!QCoreApplication::eventDispatcher()->inherits(
		"QEventDispatcherGlib")) {
		g_warning("Qt is running without GLib event loop integration, "
			"expect various functionality to not to work.");
	}
}

void LinuxIntegration::init() {
	initInhibit();
}

void LinuxIntegration::initInhibit() {
	if (!_inhibitProxy) {
		return;
	}

	auto uniqueName = _inhibitProxy
		.get_connection()
		.get_unique_name()
		.value_or("");

	uniqueName.erase(0, 1);
	uniqueName.replace(uniqueName.find('.'), 1, 1, '_');

	const auto handleToken = "tdesktop"
		+ std::to_string(base::RandomValue<uint>());

	const auto sessionHandleToken = "tdesktop"
		+ std::to_string(base::RandomValue<uint>());

	const auto sessionHandle = "/org/freedesktop/portal/desktop/session/"
		+ uniqueName
		+ '/'
		+ sessionHandleToken;

	inhibit().signal_state_changed().connect([
		mySessionHandle = sessionHandle
	](
			XdpInhibit::Inhibit,
			const std::string &sessionHandle,
			GLib::Variant state) {
		if (sessionHandle != mySessionHandle) {
			return;
		}

		Core::App().setScreenIsLocked(
			GLib::VariantDict::new_(
				state
			).lookup_value(
				"screensaver-active"
			).get_boolean()
		);
	});

	const auto options = std::array{
		GLib::Variant::new_dict_entry(
			GLib::Variant::new_string("handle_token"),
			GLib::Variant::new_variant(
				GLib::Variant::new_string(handleToken))),
		GLib::Variant::new_dict_entry(
			GLib::Variant::new_string("session_handle_token"),
			GLib::Variant::new_variant(
				GLib::Variant::new_string(sessionHandleToken))),
	};

	inhibit().call_create_monitor(
		{},
		GLib::Variant::new_array(options.data(), options.size()),
		nullptr);
}

} // namespace

std::unique_ptr<Integration> CreateIntegration() {
	return std::make_unique<LinuxIntegration>();
}

} // namespace Platform