/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL

#include "common/system.h"
#include "backends/updates/win32/win32-updates.h"

#ifdef USE_SPARKLE
#include "backends/platform/sdl/win32/win32-window.h"
#include "common/config-manager.h"

#include <time.h>
#include <windows.h>
#include <winsparkle.h>

/**
 * Sparkle is a software update framework for macOS which uses appcasts for
 * release information. Appcasts are RSS-like XML feeds which contain information
 * about the most current version at the time. If a new version is available, the
 * user is presented the release-notes/changes/fixes and is asked if they want to
 * update, and if yes the Sparkle framework downloads a signed update package
 * from the server and automatically installs and restarts the software.
 * More detailed information is available at the following address:
 * https://sparkle-project.org/
 *
 * WinSparkle is a heavily (to the point of being its almost-port) inspired by the
 * Sparkle framework originally by Andy Matuschak that became the de facto standard
 * for software updates on macOS.
 * More detailed information is available at the following address:
 * https://winsparkle.org/
 *
 */

static SdlWindow_Win32 *_window;

Win32UpdateManager::Win32UpdateManager(SdlWindow_Win32 *window) {
	_window = window;
	const char *appcastUrl = "https://www.scummvm.org/appcasts/macosx/release.xml";
	win_sparkle_set_appcast_url(appcastUrl);
	win_sparkle_set_can_shutdown_callback(canShutdownCallback);
	win_sparkle_set_shutdown_request_callback(shutdownRequestCallback);
	win_sparkle_init();

	if (!ConfMan.hasKey("updates_check")
	  || ConfMan.getInt("updates_check") == Common::UpdateManager::kUpdateIntervalNotSupported) {
		setAutomaticallyChecksForUpdates(kUpdateStateDisabled);
	} else {
		setAutomaticallyChecksForUpdates(kUpdateStateEnabled);
		setUpdateCheckInterval(normalizeInterval(ConfMan.getInt("updates_check")));
	}
}

Win32UpdateManager::~Win32UpdateManager() {
	win_sparkle_cleanup();
}

void Win32UpdateManager::checkForUpdates() {
	win_sparkle_check_update_with_ui();
}

void Win32UpdateManager::setAutomaticallyChecksForUpdates(UpdateManager::UpdateState state) {
	if (state == kUpdateStateNotSupported)
		return;

	win_sparkle_set_automatic_check_for_updates(state == kUpdateStateEnabled ? 1 : 0);
}

Common::UpdateManager::UpdateState Win32UpdateManager::getAutomaticallyChecksForUpdates() {
	if (win_sparkle_get_automatic_check_for_updates() == 1)
		return kUpdateStateEnabled;
	else
		return kUpdateStateDisabled;
}

void Win32UpdateManager::setUpdateCheckInterval(int interval) {
	if (interval == kUpdateIntervalNotSupported)
		return;

	interval = normalizeInterval(interval);

	win_sparkle_set_update_check_interval(interval);
}

int Win32UpdateManager::getUpdateCheckInterval() {
	// This is kind of a hack but necessary, as the value stored by Sparkle
	// might have been changed outside of ScummVM (in which case we return the
	// default interval of one day)

	int updateInterval = win_sparkle_get_update_check_interval();
	switch (updateInterval) {
	case kUpdateIntervalOneDay:
	case kUpdateIntervalOneWeek:
	case kUpdateIntervalOneMonth:
		return updateInterval;

	default:
		// Return the default value (one day)
		return kUpdateIntervalOneDay;
	}
}

bool Win32UpdateManager::getLastUpdateCheckTimeAndDate(TimeDate &t) {
	time_t updateTime = win_sparkle_get_last_check_time();
	tm *ut = localtime(&updateTime);

	t.tm_wday = ut->tm_wday;
	t.tm_year = ut->tm_year;
	t.tm_mon  = ut->tm_mon;
	t.tm_mday = ut->tm_mday;
	t.tm_hour = ut->tm_hour;
	t.tm_min  = ut->tm_min;
	t.tm_sec  = ut->tm_sec;

	return true;
}

// WinSparkle calls this to ask if we can shut down.
//  At this point the download has completed, the user has
//  selected Install Update, and the installer has started.
//  This callback runs on a non-main thread.
int Win32UpdateManager::canShutdownCallback() {
	return true;
}

// WinSparkle calls this to request that we shut down.
//  This callback runs on a non-main thread so we post
//  a WM_CLOSE message to our window so that we exit
//  cleanly, as opposed to calling g_system->quit().
void Win32UpdateManager::shutdownRequestCallback() {
	PostMessage(_window->getHwnd(), WM_CLOSE, 0, 0);
}

#endif
