/*
 * xemu Automatic Update
 *
 * Copyright (C) 2021 Matt Borgerson
 *
 * 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 2 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/>.
 */

#ifndef XEMU_UPDATE_H
#define XEMU_UPDATE_H

#include <string>
#include <stdint.h>
#include <functional>

extern "C" {
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/thread.h"
}

typedef enum {
	UPDATE_AVAILABILITY_UNKNOWN,
	UPDATE_NOT_AVAILABLE,
	UPDATE_AVAILABLE
} UpdateAvailability;

typedef enum {
	UPDATER_IDLE,
	UPDATER_ERROR,
	UPDATER_CHECKING_FOR_UPDATE,
	UPDATER_UPDATING,
	UPDATER_UPDATE_SUCCESSFUL
} UpdateStatus;

using UpdaterCallback = std::function<void(void)>;

class Updater {
private:
	UpdateAvailability  m_update_availability;
	int                 m_update_percentage;
	QemuThread          m_thread;
	std::string         m_latest_version;
	bool                m_should_cancel;
	UpdateStatus        m_status;
	UpdaterCallback     m_on_complete;

public:
	Updater();
	UpdateStatus get_status() { return m_status; }
	UpdateAvailability get_update_availability() { return m_update_availability; }
	bool is_errored() { return m_status == UPDATER_ERROR; }
	bool is_pending_restart() { return m_status == UPDATER_UPDATE_SUCCESSFUL; }
	bool is_update_available() { return m_update_availability == UPDATE_AVAILABLE; }
	bool is_checking_for_update() { return m_status == UPDATER_CHECKING_FOR_UPDATE; }
	bool is_updating() { return m_status == UPDATER_UPDATING; }
	std::string get_update_version() { return m_latest_version; }
	void cancel() { m_should_cancel = true; }
	void update();
	void update_internal();
	void check_for_update(UpdaterCallback on_complete = nullptr);
	void check_for_update_internal();
	int get_update_progress_percentage() { return m_update_percentage; }
	static void *update_thread_worker_func(void *updater);
	static void *checker_thread_worker_func(void *updater);
	void restart_to_updated(void);
};

#endif