$POWERCONFGIG_OUTPUT_FOLDER            = "PowerConfig"
$POWERCONFGIG_SYSTEM_POWER_REPORT_HTML = "PowerCfg-SleepStudyReport.html"
$POWERCONFGIG_TIMEOUT_SEC              = 10 * 60

Add-Type -TypeDefinition @'

using System;
using System.Runtime.InteropServices;

namespace DllAPI
{
    public class Kernel32Call
    {
        [System.Runtime.InteropServices.DllImport("kernel32.dll")]
        static extern int GetCurrentProcess();

        [System.Runtime.InteropServices.DllImport("kernel32.dll")]
        static extern bool IsWow64Process(int proc, out int isWow64);

        public int dll_GetCurrentProcess()
        {
            return GetCurrentProcess();
        }

        public bool dll_IsWow64Process(int proc)
        {
            int isWow64 = 0;
            bool ret = IsWow64Process(proc, out isWow64);
            if (ret == false)
            {
                return false;
            }
            else
            {
                if (isWow64 != 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }
    } // End -- Kernel32Call Class
}
'@

$Kern32Call = New-Object -TypeName DllAPI.Kernel32Call

function Write-PowerConfigSystemPowerReport {
param (
    [parameter(Mandatory=$true)][string]$ResultPath
)
    $DestDir = Join-Path -Path $ResultPath -ChildPath $POWERCONFGIG_OUTPUT_FOLDER
    if (-not (Test-Path "$DestDir" -pathType container))
    {
        New-Item $DestDir -ItemType directory > $null
    }

    $options = "-systempowerreport -output `"$DestDir\$POWERCONFGIG_SYSTEM_POWER_REPORT_HTML`""
    $CurrProc = $Kern32Call.dll_GetCurrentProcess();
    $isWow64 = $Kern32Call.dll_IsWow64Process($CurrProc);

    if ($isWow64)
    {
        $powerCfgPath = "$env:windir\Sysnative\"
    }
    else
    {
        $powerCfgPath = "$env:windir\System32\"
    }

    $_cmdletExist = Get-Command DisableWow64FsRedirection; if ( $_cmdletExist ) { DisableWow64FsRedirection };
    $proc = Start-Process "$powerCfgPath\powercfg.exe" -ArgumentList "$Options" `
        -NoNewWindow -PassThru
    $_cmdletExist = Get-Command RevertWow64FsRedirection ; if ( $_cmdletExist ) { RevertWow64FsRedirection };

    try
    {
        $proc | Wait-Process -Timeout $POWERCONFGIG_TIMEOUT_SEC -ErrorAction Stop
    }
    catch
    {
        $proc | Stop-Process
        throw "The powercfg.exe exceeded timeout, it will be killed."
    }
}

Export-ModuleMember -Function Write-PowerConfigSystemPowerReport

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