param([string]$BuildDirectory = (Join-Path $PSScriptRoot '../build/staged'))
$ErrorActionPreference = 'Stop'
if (Get-Process KSwitcher,'KSwitcher.Config' -ErrorAction SilentlyContinue) {
    throw 'Close KSwitcher and its configurator before this isolated process test.'
}
Add-Type @'
using System;
using System.Runtime.InteropServices;
public static class ConfigurationTestUi {
 [StructLayout(LayoutKind.Explicit, Size=40)] public struct Input {
  [FieldOffset(0)] public uint type;
  [FieldOffset(8)] public ushort key;
  [FieldOffset(12)] public uint flags;
 }
 [DllImport("user32.dll")] public static extern uint SendInput(uint count,Input[] input,int size);
 public static uint PressF24() { return SendInput(2,new Input[]{new Input{type=1,key=0x87},new Input{type=1,key=0x87,flags=2}},40); }
 [DllImport("user32.dll")] public static extern IntPtr GetForegroundWindow();
 [DllImport("user32.dll", EntryPoint="SendMessageW", CharSet=CharSet.Unicode)] public static extern IntPtr GetText(IntPtr w,uint msg,IntPtr count,System.Text.StringBuilder text);
 [DllImport("user32.dll", CharSet=CharSet.Unicode)] public static extern IntPtr FindWindow(string cls,string title);
 [DllImport("user32.dll")] public static extern IntPtr GetDlgItem(IntPtr w,int id);
 [DllImport("user32.dll")] public static extern bool PostMessage(IntPtr w,uint msg,IntPtr wp,IntPtr lp);
 [DllImport("user32.dll")] public static extern IntPtr SendMessage(IntPtr w,uint msg,IntPtr wp,IntPtr lp);
 [DllImport("user32.dll", EntryPoint="SendMessageW", CharSet=CharSet.Unicode)] public static extern IntPtr SetText(IntPtr w,uint msg,IntPtr wp,string text);
 [DllImport("user32.dll")] public static extern uint GetWindowThreadProcessId(IntPtr w,out uint pid);
 [DllImport("kernel32.dll")] public static extern uint GetCurrentThreadId();
 [DllImport("user32.dll")] public static extern bool AttachThreadInput(uint a,uint b,bool attach);
 [DllImport("user32.dll")] public static extern IntPtr SetFocus(IntPtr w);
 public static bool FocusControl(IntPtr w) {
  uint pid; uint target=GetWindowThreadProcessId(w,out pid), current=GetCurrentThreadId();
  if(!AttachThreadInput(current,target,true)) return false;
  try { SetFocus(w); return true; } finally { AttachThreadInput(current,target,false); }
 }
}
'@
$root=Join-Path ([IO.Path]::GetTempPath()) ('KSwitcher-config-tests-'+[guid]::NewGuid().ToString('N'))
$processes=[Collections.Generic.List[Diagnostics.Process]]::new()
$checks=0
function Assert($ok,$label) { if (!$ok) { throw $label }; $script:checks++ }
function Window($class) {
    for($i=0;$i -lt 100;$i++) {
        $title=switch($class){'KSwitcher.Main'{'KSwitcher'};'KSwitcher.Settings'{'KSwitcher settings'};'KSwitcher.Snippets'{'Text snippets'}}
        $window=[ConfigurationTestUi]::FindWindow($class,$title)
        if($window -ne [IntPtr]::Zero){return $window}
        Start-Sleep -Milliseconds 50
    }
    foreach($process in $processes){$process.Refresh(); Write-Host ("Diagnostic process {0}: exited={1} title={2}" -f $process.Id,$process.HasExited,$process.MainWindowTitle)}
    throw "Window did not appear: $class"
}
function Launch($file,$argument) {
    $options=@{FilePath=(Join-Path $root $file);PassThru=$true;WindowStyle='Hidden'}
    if($argument){$options.ArgumentList=$argument}
    $process=Start-Process @options
    $processes.Add($process)
    return $process
}
function Click($window,$id) {
    $null=[ConfigurationTestUi]::PostMessage($window,0x111,[IntPtr]$id,[IntPtr]::Zero)
}
try {
    New-Item -ItemType Directory -Path (Join-Path $root 'data') -Force | Out-Null
    foreach($file in @('KSwitcher.exe','KSwitcher.Config.exe')) {
        Copy-Item -LiteralPath (Join-Path $BuildDirectory $file) -Destination $root
    }
    # No clipboard history capture, auto-correction, autostart or user data in the fixture.
    $settingsPath=Join-Path $root 'data/settings.json'
    @{format='kswitcher-settings';schemaVersion=1;historyEnabled=$false;autoCorrectLayout=$false;writeLog=$false} |
        ConvertTo-Json | Set-Content -LiteralPath $settingsPath -Encoding utf8
    $resident=Launch 'KSwitcher.exe' ''
    $main=Window 'KSwitcher.Main'
    $config=Launch 'KSwitcher.Config.exe' ''
    $settings=Window 'KSwitcher.Settings'
    [uint32]$ownerId=0
    $null=[ConfigurationTestUi]::GetWindowThreadProcessId($settings,[ref]$ownerId)
    Assert ($ownerId -eq $config.Id -and $ownerId -ne $resident.Id) 'settings live in the separate process'
    $second=Launch 'KSwitcher.Config.exe' ''
    Assert ($second.WaitForExit(6000) -and $second.ExitCode -eq 0) 'second launch forwards to existing instance'
    Assert ((Window 'KSwitcher.Settings') -eq $settings) 'existing settings window reused'
    # Only inject into the isolated fixture window, never another foreground app.
    Assert ([ConfigurationTestUi]::GetForegroundWindow() -eq $settings) 'fixture owns foreground before shortcut capture test'
    $field=[ConfigurationTestUi]::GetDlgItem($settings,210)
    Assert ([ConfigurationTestUi]::FocusControl($field)) 'shortcut field receives actual focus'
    Assert ([ConfigurationTestUi]::PressF24() -eq 2) 'test F24 events accepted'
    $text=[Text.StringBuilder]::new(128)
    for($i=0;$i -lt 100;$i++) {
        $null=$text.Clear()
        $null=[ConfigurationTestUi]::GetText($field,0x0d,[IntPtr]128,$text)
        if($text.ToString() -eq 'F24'){break}
        Start-Sleep -Milliseconds 20
    }
    Assert ($text.ToString() -eq 'F24') 'resident hook forwards shortcut capture to configurator'
    $null=[ConfigurationTestUi]::SetText([ConfigurationTestUi]::GetDlgItem($settings,240),0x0c,[IntPtr]::Zero,'321')
    Click $settings 1
    Assert ($config.WaitForExit(6000) -and $config.ExitCode -eq 0) 'save exits configurator'
    Assert ((Get-Content -LiteralPath $settingsPath -Raw | ConvertFrom-Json).maxItems -eq 321) 'save committed through resident process'
    Assert ((Get-Content -LiteralPath $settingsPath -Raw | ConvertFrom-Json).toggleHotkey -eq 'F24') 'captured shortcut persisted by resident'
    $resident.Refresh(); Assert (!$resident.HasExited) 'resident survives settings save'
    $config=Launch 'KSwitcher.Config.exe' ''
    $settings=Window 'KSwitcher.Settings'
    $null=[ConfigurationTestUi]::SetText([ConfigurationTestUi]::GetDlgItem($settings,240),0x0c,[IntPtr]::Zero,'456')
    Click $settings 2
    Assert ($config.WaitForExit(6000)) 'cancel exits configurator'
    Assert ((Get-Content -LiteralPath $settingsPath -Raw | ConvertFrom-Json).maxItems -eq 321) 'cancel preserves saved settings'
    $config=Launch 'KSwitcher.Config.exe' '--snippets'
    $snippets=Window 'KSwitcher.Snippets'
    $second=Launch 'KSwitcher.Config.exe' ''
    Assert ($second.WaitForExit(6000) -and $second.ExitCode -eq 0) 'settings and snippets share a single process'
    $settings=Window 'KSwitcher.Settings'
    Click $settings 2
    Start-Sleep -Milliseconds 100
    $config.Refresh(); Assert (!$config.HasExited) 'closing settings keeps open snippets alive'
    Click $snippets 2
    Assert ($config.WaitForExit(6000)) 'closing last window exits configurator'
    $config=Launch 'KSwitcher.Config.exe' ''
    $null=Window 'KSwitcher.Settings'
    $null=[ConfigurationTestUi]::PostMessage($main,0x10,[IntPtr]::Zero,[IntPtr]::Zero)
    Assert ($resident.WaitForExit(10000)) 'resident shuts down normally'
    Assert ($config.WaitForExit(6000)) 'resident exit closes configurator'
    $config=Launch 'KSwitcher.Config.exe' ''
    $main=Window 'KSwitcher.Main'
    [uint32]$bootstrappedId=0
    $null=[ConfigurationTestUi]::GetWindowThreadProcessId($main,[ref]$bootstrappedId)
    $bootstrapped=Get-Process -Id $bootstrappedId
    $processes.Add($bootstrapped)
    $settings=Window 'KSwitcher.Settings'
    Assert ($bootstrappedId -ne $resident.Id) 'standalone configurator starts its resident sibling'
    Click $settings 2
    Assert ($config.WaitForExit(6000)) 'standalone configurator exits after cancel'
    $null=[ConfigurationTestUi]::PostMessage($main,0x10,[IntPtr]::Zero,[IntPtr]::Zero)
    Assert ($bootstrapped.WaitForExit(10000)) 'bootstrapped resident shuts down normally'
    "Passed $checks configurator process checks"
} finally {
    foreach($process in $processes) {
        $process.Refresh()
        if(!$process.HasExited) { Stop-Process -Id $process.Id -Force }
        $process.Dispose()
    }
    # The generated fixture is the only recursive deletion target.
    $resolved=[IO.Path]::GetFullPath($root)
    $temp=[IO.Path]::GetFullPath([IO.Path]::GetTempPath())
    if(!$resolved.StartsWith($temp,[StringComparison]::OrdinalIgnoreCase) -or
       [IO.Path]::GetFileName($resolved) -notlike 'KSwitcher-config-tests-*') { throw 'Unexpected fixture path' }
    Remove-Item -LiteralPath $resolved -Recurse -Force
}