/*  power_windows.cpp                                                    */


/*
Adapted from corresponding SDL 2.0 code.
*/

/*
 * Simple DirectMedia Layer
 * Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

#include "power_windows.h"

// CODE CHUNK IMPORTED FROM SDL 2.0

bool PowerWindows::GetPowerInfo_Windows() {
	SYSTEM_POWER_STATUS status;
	bool need_details = FALSE;

	/* This API should exist back to Win95. */
	if (!GetSystemPowerStatus(&status)) {
		/* !!! FIXME: push GetLastError() into GetError() */
		power_state = OS::POWERSTATE_UNKNOWN;
	} else if (status.BatteryFlag == 0xFF) { /* unknown state */
		power_state = OS::POWERSTATE_UNKNOWN;
	} else if (status.BatteryFlag & (1 << 7)) { /* no battery */
		power_state = OS::POWERSTATE_NO_BATTERY;
	} else if (status.BatteryFlag & (1 << 3)) { /* charging */
		power_state = OS::POWERSTATE_CHARGING;
		need_details = TRUE;
	} else if (status.ACLineStatus == 1) {
		power_state = OS::POWERSTATE_CHARGED; /* on AC, not charging. */
		need_details = TRUE;
	} else {
		power_state = OS::POWERSTATE_ON_BATTERY; /* not on AC. */
		need_details = TRUE;
	}

	percent_left = -1;
	nsecs_left = -1;
	if (need_details) {
		const int pct = (int)status.BatteryLifePercent;
		const int secs = (int)status.BatteryLifeTime;

		if (pct != 255) { /* 255 == unknown */
			percent_left = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
		}
		if (secs != (int)0xFFFFFFFF) { /* ((DWORD)-1) == unknown */
			nsecs_left = secs;
		}
	}

	return TRUE; /* always the definitive answer on Windows. */
}

OS::PowerState PowerWindows::get_power_state() {
	if (GetPowerInfo_Windows()) {
		return power_state;
	} else {
		return OS::POWERSTATE_UNKNOWN;
	}
}

int PowerWindows::get_power_seconds_left() {
	if (GetPowerInfo_Windows()) {
		return nsecs_left;
	} else {
		return -1;
	}
}

int PowerWindows::get_power_percent_left() {
	if (GetPowerInfo_Windows()) {
		return percent_left;
	} else {
		return -1;
	}
}

PowerWindows::PowerWindows() :
		nsecs_left(-1),
		percent_left(-1),
		power_state(OS::POWERSTATE_UNKNOWN) {
}

PowerWindows::~PowerWindows() {
}