$ErrorActionPreference = 'Stop'
$root = Split-Path $PSScriptRoot
try {
    if (Get-Process 'KSwitcher.Screenshot' -ErrorAction SilentlyContinue | Where-Object { $_.Path -eq (Join-Path $root 'build\KSwitcher.Screenshot.exe') }) { throw 'Close screenshot editors before updating the development build.' }
    $exe = Join-Path $root 'build\KSwitcher.exe'
    $running = @(Get-Process KSwitcher -ErrorAction SilentlyContinue | Where-Object { $_.Path -eq $exe })
    $stop = Start-Process -FilePath $exe -ArgumentList '--exit' -WindowStyle Hidden -PassThru
    if (-not $stop.WaitForExit(5000)) { throw 'Exit command timed out.' }
    foreach ($process in $running) { if (-not $process.WaitForExit(10000)) { throw 'KSwitcher did not stop.' } }
    $config = @(Get-Process 'KSwitcher.Config' -ErrorAction SilentlyContinue | Where-Object { $_.Path -eq (Join-Path $root 'build\KSwitcher.Config.exe') })
    foreach ($process in $config) { if (-not $process.WaitForExit(10000)) { throw 'Close the configurator before updating.' } }
    Copy-Item -LiteralPath (Join-Path $root 'build\staged\KSwitcher.Config.exe') -Destination (Join-Path $root 'build\KSwitcher.Config.exe') -Force
    Copy-Item -LiteralPath (Join-Path $root 'build\staged\KSwitcher.exe') -Destination $exe -Force
    Copy-Item -LiteralPath (Join-Path $root 'build\staged\KSwitcher.Screenshot.exe') -Destination (Join-Path $root 'build\KSwitcher.Screenshot.exe') -Force
    $eventName = 'Local\KSwitcher.Update.Started.' + [guid]::NewGuid().ToString('N')
    $started = [System.Threading.EventWaitHandle]::new($false, [System.Threading.EventResetMode]::ManualReset, $eventName)
    try {
        $newProcess = Start-Process -FilePath $exe -ArgumentList "--update-ready-event=$eventName" -WorkingDirectory (Split-Path $exe) -WindowStyle Hidden -PassThru
        if (-not $started.WaitOne(10000)) { throw 'KSwitcher did not confirm startup within 10 seconds.' }
        if ($newProcess.WaitForExit(1000)) { throw "KSwitcher exited after startup (code $($newProcess.ExitCode))." }
    } finally { $started.Dispose() }
    'OK' | Set-Content -LiteralPath (Join-Path $root 'build\update-result.txt')
} catch { $_.Exception.Message | Set-Content -LiteralPath (Join-Path $root 'build\update-result.txt'); exit 1 }