//go:build windows

package main

import (
	"syscall"
	"unsafe"
)

type systemPowerStatus struct {
	ACLineStatus        byte
	BatteryFlag         byte
	BatteryLifePercent  byte
	SystemStatusFlag    byte
	BatteryLifeTime     uint32
	BatteryFullLifeTime uint32
}

var getSystemPowerStatus = syscall.NewLazyDLL("kernel32.dll").NewProc("GetSystemPowerStatus")

func systemBattery() (bool, error) {
	var status systemPowerStatus
	result, _, err := getSystemPowerStatus.Call(uintptr(unsafe.Pointer(&status)))
	if result == 0 {
		return false, err
	}
	return windowsOnBattery(status.ACLineStatus, status.BatteryFlag), nil
}