/*************************************************************************/
/*  power_windows.cpp                                                    */
/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
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#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 = POWERSTATE_UNKNOWN;
	} else if (status.BatteryFlag == 0xFF) { /* unknown state */
		power_state = POWERSTATE_UNKNOWN;
	} else if (status.BatteryFlag & (1 << 7)) { /* no battery */
		power_state = POWERSTATE_NO_BATTERY;
	} else if (status.BatteryFlag & (1 << 3)) { /* charging */
		power_state = POWERSTATE_CHARGING;
		need_details = TRUE;
	} else if (status.ACLineStatus == 1) {
		power_state = POWERSTATE_CHARGED; /* on AC, not charging. */
		need_details = TRUE;
	} else {
		power_state = 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 != 0xFFFFFFFF) { /* ((DWORD)-1) == unknown */
			nsecs_left = secs;
		}
	}

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

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

PowerWindows::~PowerWindows() {
}