/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#pragma once

#include "Base/Event.hpp"
#include <string>

namespace OpenVulkano
{
	struct OsVersion
	{
		int major, minor, patch, build;
	};

	enum class DeviceType { Phone, Tablet, PC, TV, VR, Unknown };

	enum class CpuThermalState { Normal, Fair, Serious, Critical };

	enum class BatteryState { Unavailable, Unplugged, Charging, ChargingFull, NotCharging };

	enum class DeviceOrientation { Portrait, PortraitUpsideDown, LandscapeLeft, LandscapeRight, FaceUp, FaceDown, Unknown };

	enum class InterfaceOrientation { Portrait, PortraitUpsideDown, LandscapeLeft, LandscapeRight, Landscape = LandscapeLeft };

	class SystemInfo
	{
	public:
		static size_t GetSystemRam();
		static size_t GetSystemRamAvailable();
		static size_t GetAppRamMax();
		static size_t GetAppVirtualMemoryMax();
		static size_t GetAppRamAvailable();
		static size_t GetAppRamUsed();

		static std::string GetUserName();
		static std::string GetHostName();

		// Device name as given by the user
		static std::string GetDeviceName();
		static std::string GetDeviceVendorName();
		static std::string GetDeviceModelName();
		static std::string GetOsName();
		static OsVersion   GetOsVersion();
		static std::string GetOsNameHumanReadable();
		static DeviceType  GetDeviceType();

		static size_t  GetCpuCoreCount();
		static size_t  GetCpuThreadCount();
		static int32_t GetCpuTemperature();
		static CpuThermalState GetCpuThermalState();

		static bool IsDeviceInLowPowerMode();
		static bool GetDeviceHasBattery() { return GetDeviceBatteryState() != BatteryState::Unavailable; }
		static BatteryState GetDeviceBatteryState();
		// 0 to 1; -1 not available
		static float GetDeviceBatteryLevel();
		static void EnableEnergyEvents();

		/**
		 * Checks if device allows to run multiple applications at the same time.
		 * Will probably return true, for everything but smartphones.
		 * @return true if multiple applications can run at the same time, false if not
		 */
		static bool IsMultitaskingSupported();
		static DeviceOrientation GetDeviceOrientation();
		static void EnableDeviceOrientationEvents();
		static InterfaceOrientation GetInterfaceOrientation();

		static Event<> OnLowPowerModeChanged;
		static Event<> OnBatteryStateChanged;
		static Event<> OnBatteryLevelChanged;
		static Event<> OnDeviceOrientationChanged;
	};
}