ImageOptimizer.ps1

# Ultimate Image Optimizer Pro (WPF Edition)
# MIT License | Copyright (c) 2026 Bishnu Mahali

Add-Type -AssemblyName PresentationFramework
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing

# ==========================================
# THEME ENGINE
# ==========================================
function Get-SystemTheme {
    try {
        $reg = Get-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize" -ErrorAction SilentlyContinue
        if ($reg.AppsUseLightTheme -eq 0) { return "Dark" }
    } catch {}
    return "Light"
}

$CurrentTheme = Get-SystemTheme
$Theme = if ($CurrentTheme -eq "Dark") {
    @{ WindowBg="#1B1F23"; CardBg="#24292E"; TextMain="#E6EDF3"; TextSub="#8C959F"; Border="#30363D"; InputBg="#0D1117"; Primary="#007BFF"; Accent="#0969DA"; Shadow="#000000"; ProgressBg="#30363D"; Hover="#1F883D"; Success="#28A745"; Error="#E74C3C" }
} else {
    @{ WindowBg="#F8F9FA"; CardBg="#FFFFFF"; TextMain="#1A1A1A"; TextSub="#6C757D"; Border="#DEE2E6"; InputBg="#F8F9FA"; Primary="#007BFF"; Accent="#007BFF"; Shadow="#E0E0E0"; ProgressBg="#E9ECEF"; Hover="#0056B3"; Success="#28A745"; Error="#E74C3C" }
}

# ==========================================
# XAML UI DEFINITION
# ==========================================
[xml]$xaml = @"
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Image Optimizer Pro" Height="850" Width="1100" Background="$($Theme.WindowBg)" WindowStartupLocation="CenterScreen">
    <Window.Resources>
        <ControlTemplate x:Key="ComboBoxTemplate" TargetType="ComboBox">
            <Grid>
                <ToggleButton Name="ToggleButton" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press">
                    <ToggleButton.Template>
                        <ControlTemplate TargetType="ToggleButton">
                            <Border Name="Border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="4">
                                <Grid HorizontalAlignment="Right" Width="24"><Path Name="Arrow" Fill="{TemplateBinding Foreground}" Data="M 0 0 L 4 4 L 8 0 Z" VerticalAlignment="Center" HorizontalAlignment="Center"/></Grid>
                            </Border>
                        </ControlTemplate>
                    </ToggleButton.Template>
                </ToggleButton>
                <ContentPresenter Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="10,3,30,3" VerticalAlignment="Center" HorizontalAlignment="Left" />
                <Popup Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Slide">
                    <Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}"><Border Name="DropDownBorder" Background="$($Theme.InputBg)" BorderBrush="$($Theme.Border)" BorderThickness="1" CornerRadius="4"><ScrollViewer Margin="0" SnapsToDevicePixels="True"><StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" /></ScrollViewer></Border></Grid>
                </Popup>
            </Grid>
        </ControlTemplate>

        <ControlTemplate x:Key="CheckBoxTemplate" TargetType="CheckBox">
            <StackPanel Orientation="Horizontal">
                <Border Width="16" Height="16" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1" Background="{TemplateBinding Background}" CornerRadius="2"><Path Name="CheckMark" Fill="{TemplateBinding Foreground}" Data="M 0 5 L 4 9 L 10 0" Visibility="Collapsed" Stroke="{TemplateBinding Foreground}" StrokeThickness="2" Margin="2" /></Border>
                <ContentPresenter Margin="8,0,0,0" VerticalAlignment="Center" />
            </StackPanel>
            <ControlTemplate.Triggers><Trigger Property="IsChecked" Value="True"><Setter TargetName="CheckMark" Property="Visibility" Value="Visible" /></Trigger></ControlTemplate.Triggers>
        </ControlTemplate>

        <Style TargetType="TextBlock"><Setter Property="Foreground" Value="$($Theme.TextMain)"/></Style>
        <Style TargetType="CheckBox"><Setter Property="Template" Value="{StaticResource CheckBoxTemplate}"/><Setter Property="Foreground" Value="$($Theme.TextMain)"/></Style>
        <Style TargetType="RadioButton"><Setter Property="Foreground" Value="$($Theme.TextMain)"/></Style>
        <Style TargetType="TextBox"><Setter Property="Background" Value="$($Theme.InputBg)"/><Setter Property="Foreground" Value="$($Theme.TextMain)"/><Setter Property="BorderBrush" Value="$($Theme.Border)"/><Setter Property="VerticalContentAlignment" Value="Center"/><Setter Property="Padding" Value="5"/></Style>
        <Style TargetType="ComboBox"><Setter Property="Template" Value="{StaticResource ComboBoxTemplate}" /><Setter Property="Background" Value="$($Theme.InputBg)"/><Setter Property="Foreground" Value="$($Theme.TextMain)"/><Setter Property="BorderBrush" Value="$($Theme.Border)"/><Setter Property="Height" Value="32"/></Style>
        <Style TargetType="ComboBoxItem"><Setter Property="Background" Value="Transparent"/><Setter Property="Foreground" Value="$($Theme.TextMain)"/><Setter Property="Padding" Value="10,6"/><Style.Triggers><Trigger Property="IsHighlighted" Value="True"><Setter Property="Background" Value="$($Theme.Accent)"/><Setter Property="Foreground" Value="White"/></Trigger></Style.Triggers></Style>
        <Style TargetType="DataGrid"><Setter Property="Background" Value="$($Theme.InputBg)"/><Setter Property="BorderBrush" Value="$($Theme.Border)"/><Setter Property="Foreground" Value="$($Theme.TextMain)"/><Setter Property="RowBackground" Value="$($Theme.CardBg)"/><Setter Property="AlternatingRowBackground" Value="$($Theme.InputBg)"/><Setter Property="HorizontalGridLinesBrush" Value="$($Theme.Border)"/><Setter Property="VerticalGridLinesBrush" Value="$($Theme.Border)"/><Setter Property="BorderThickness" Value="1"/><Setter Property="FontSize" Value="13"/><Setter Property="RowHeight" Value="32"/><Setter Property="VirtualizingPanel.IsVirtualizing" Value="True"/><Setter Property="VirtualizingPanel.VirtualizationMode" Value="Recycling"/></Style>
        <Style TargetType="DataGridColumnHeader"><Setter Property="Background" Value="$($Theme.InputBg)"/><Setter Property="Foreground" Value="$($Theme.TextSub)"/><Setter Property="Padding" Value="10,8"/><Setter Property="FontWeight" Value="Bold"/><Setter Property="BorderBrush" Value="$($Theme.Border)"/><Setter Property="BorderThickness" Value="0,0,1,1"/></Style>
        <Style TargetType="DataGridCell"><Setter Property="BorderThickness" Value="0"/><Setter Property="Padding" Value="10,5"/><Style.Triggers><Trigger Property="IsSelected" Value="True"><Setter Property="Background" Value="$($Theme.Accent)"/><Setter Property="Foreground" Value="White"/></Trigger></Style.Triggers></Style>
        <Style x:Key="CardStyle" TargetType="Border"><Setter Property="Background" Value="$($Theme.CardBg)"/><Setter Property="CornerRadius" Value="12"/><Setter Property="Padding" Value="20"/><Setter Property="Margin" Value="0,0,0,20"/><Setter Property="BorderBrush" Value="$($Theme.Border)"/><Setter Property="BorderThickness" Value="1"/><Setter Property="Effect"><Setter.Value><DropShadowEffect BlurRadius="15" Color="$($Theme.Shadow)" ShadowDepth="2" Opacity="0.3"/></Setter.Value></Setter></Style>
        <Style x:Key="PrimaryButtonStyle" TargetType="Button"><Setter Property="Background" Value="$($Theme.Primary)"/><Setter Property="Foreground" Value="White"/><Setter Property="FontWeight" Value="Bold"/><Setter Property="Padding" Value="25,12"/><Setter Property="BorderThickness" Value="0"/><Setter Property="Cursor" Value="Hand"/><Setter Property="Height" Value="45"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="Button"><Border Name="Border" Background="{TemplateBinding Background}" CornerRadius="6"><ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/></Border><ControlTemplate.Triggers><Trigger Property="IsMouseOver" Value="True"><Setter TargetName="Border" Property="Background" Value="$($Theme.Hover)"/></Trigger><Trigger Property="IsEnabled" Value="False"><Setter Name="Border" Background="$($Theme.ProgressBg)" Foreground="$($Theme.TextSub)"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style>
        <Style x:Key="SecondaryButtonStyle" TargetType="Button"><Setter Property="Background" Value="$($Theme.InputBg)"/><Setter Property="Foreground" Value="$($Theme.TextMain)"/><Setter Property="BorderBrush" Value="$($Theme.Border)"/><Setter Property="BorderThickness" Value="1"/><Setter Property="Cursor" Value="Hand"/><Setter Property="Height" Value="35"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="Button"><Border Name="Border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="4"><ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/></Border><ControlTemplate.Triggers><Trigger Property="IsMouseOver" Value="True"><Setter TargetName="Border" Property="Background" Value="$($Theme.CardBg)"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style>
    </Window.Resources>

    <Grid Margin="30">
        <Grid.RowDefinitions><RowDefinition Height="Auto"/><RowDefinition Height="*"/><RowDefinition Height="Auto"/></Grid.RowDefinitions>
        <StackPanel Grid.Row="0" Margin="0,0,0,25"><TextBlock Text="IMAGE OPTIMIZER PRO" FontWeight="ExtraBold" FontSize="26"/><TextBlock Text="Fast, professional image compression and format conversion" Foreground="$($Theme.TextSub)" FontSize="14"/></StackPanel>
        <Grid Grid.Row="1"><Grid.ColumnDefinitions><ColumnDefinition Width="400"/><ColumnDefinition Width="*"/></Grid.ColumnDefinitions>
            <ScrollViewer Grid.Column="0" VerticalScrollBarVisibility="Auto" Margin="0,0,20,0"><StackPanel>
                <Border Style="{StaticResource CardStyle}"><StackPanel><TextBlock Text="1. TARGET FOLDER" FontWeight="Bold" Margin="0,0,0,8" Foreground="$($Theme.TextSub)"/><Grid><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="Auto"/></Grid.ColumnDefinitions><TextBox x:Name="txtPath" IsReadOnly="True"/><Button x:Name="btnBrowse" Grid.Column="1" Content="Browse" Width="80" Margin="8,0,0,0" Style="{StaticResource SecondaryButtonStyle}"/></Grid><CheckBox x:Name="chkRecursive" Content="Include Subfolders" Margin="0,12,0,0"/></StackPanel></Border>
                <Border Style="{StaticResource CardStyle}"><StackPanel><TextBlock Text="2. OPTIMIZATION" FontWeight="Bold" Margin="0,0,0,15" Foreground="$($Theme.TextSub)"/><ComboBox x:Name="comboFormat" Height="32" Margin="0,0,0,15"><ComboBoxItem Content="Original Format" IsSelected="True"/><ComboBoxItem Content="WebP (Modern)"/><ComboBoxItem Content="JPEG (Universal)"/><ComboBoxItem Content="PNG (Lossless)"/></ComboBox><Grid><TextBlock Text="Quality"/><TextBlock x:Name="lblQualityVal" Text="80%" HorizontalAlignment="Right" FontWeight="Bold" Foreground="$($Theme.Accent)"/></Grid><Slider x:Name="sliderQuality" Minimum="10" Maximum="100" Value="80" TickFrequency="5" IsSnapToTickEnabled="True" Margin="0,5,0,15"/><ComboBox x:Name="comboResize" Height="32"><ComboBoxItem Content="No Resizing" IsSelected="True"/><ComboBoxItem Content="4K (3840px)"/><ComboBoxItem Content="2K (2048px)"/><ComboBoxItem Content="Full HD (1920px)"/><ComboBoxItem Content="HD (1280px)"/></ComboBox></StackPanel></Border>
                <Border Style="{StaticResource CardStyle}"><StackPanel><TextBlock Text="3. OPTIONS" FontWeight="Bold" Margin="0,0,0,15" Foreground="$($Theme.TextSub)"/><RadioButton x:Name="rbCopy" Content="Save as Copy (_opt)" IsChecked="True" Margin="0,0,0,10"/><RadioButton x:Name="rbOverwrite" Content="Overwrite Original" Margin="0,0,0,10"/><CheckBox x:Name="chkStrip" Content="Strip Metadata" IsChecked="True"/></StackPanel></Border>
                <Border Style="{StaticResource CardStyle}"><StackPanel><TextBlock Text="4. SESSION OPTIONS" FontWeight="Bold" Foreground="$($Theme.TextSub)" Margin="0,0,0,10"/><CheckBox x:Name="chkResume" Content="Enable Resume Functionality" IsChecked="True" Margin="0,0,0,8"/><CheckBox x:Name="chkCache" Content="Enable Cache for Faster Processing" IsChecked="True" Margin="0,0,0,8"/><CheckBox x:Name="chkLog" Content="Enable Log" IsChecked="True"/></StackPanel></Border>
            </StackPanel></ScrollViewer>
            <Grid Grid.Column="1"><Grid.RowDefinitions><RowDefinition Height="Auto"/><RowDefinition Height="*"/><RowDefinition Height="Auto"/></Grid.RowDefinitions>
                <UniformGrid Grid.Row="0" Columns="3" Margin="0,0,0,20">
                    <Border Style="{StaticResource CardStyle}" Margin="0,0,10,0" Padding="15"><StackPanel HorizontalAlignment="Center"><TextBlock Text="FOUND" FontSize="10" Foreground="$($Theme.TextSub)" FontWeight="Bold"/><TextBlock x:Name="statFound" Text="0" FontSize="22" FontWeight="Bold"/></StackPanel></Border>
                    <Border Style="{StaticResource CardStyle}" Margin="5,0,5,0" Padding="15"><StackPanel HorizontalAlignment="Center"><TextBlock Text="SAVED" FontSize="10" Foreground="$($Theme.Success)" FontWeight="Bold"/><TextBlock x:Name="statSaved" Text="0 MB" FontSize="22" FontWeight="Bold"/></StackPanel></Border>
                    <Border Style="{StaticResource CardStyle}" Margin="10,0,0,0" Padding="15"><StackPanel HorizontalAlignment="Center"><TextBlock Text="EFFICIENCY" FontSize="10" Foreground="$($Theme.Accent)" FontWeight="Bold"/><TextBlock x:Name="statPct" Text="0%" FontSize="22" FontWeight="Bold"/></StackPanel></Border>
                </UniformGrid>
                <Border Grid.Row="1" Style="{StaticResource CardStyle}" Padding="0"><DataGrid x:Name="dgFiles" AutoGenerateColumns="False" IsReadOnly="True" BorderThickness="0" Background="Transparent" GridLinesVisibility="Horizontal" HeadersVisibility="Column"><DataGrid.Columns><DataGridTextColumn Header="Filename" Binding="{Binding Name}" Width="*"/><DataGridTextColumn Header="Old" Binding="{Binding OldSize}" Width="80"/><DataGridTextColumn Header="New" Binding="{Binding NewSize}" Width="80"/><DataGridTextColumn Header="Saving" Binding="{Binding Saving}" Width="70"><DataGridTextColumn.ElementStyle><Style TargetType="TextBlock"><Setter Property="Foreground" Value="$($Theme.Success)"/><Setter Property="FontWeight" Value="Bold"/></Style></DataGridTextColumn.ElementStyle></DataGridTextColumn><DataGridTextColumn Header="Status" Binding="{Binding Status}" Width="100"/></DataGrid.Columns></DataGrid></Border>
                <StackPanel Grid.Row="2" Margin="0,15,0,0"><Grid Margin="0,0,0,8"><TextBlock x:Name="lblProgress" Text="Ready"/><TextBlock x:Name="lblPctProgress" Text="0%" HorizontalAlignment="Right" FontWeight="Bold" Foreground="$($Theme.Accent)"/></Grid><ProgressBar x:Name="progressMain" Height="8" Minimum="0" Maximum="100" Value="0" Background="$($Theme.ProgressBg)" Foreground="$($Theme.Accent)" BorderThickness="0"/></StackPanel>
            </Grid>
        </Grid>
        <Grid Grid.Row="2" Margin="0,20,0,0"><StackPanel Orientation="Horizontal" VerticalAlignment="Center"><TextBlock Text="Engine: "/><TextBlock x:Name="lblEngineStatus" Text="..." FontWeight="Bold"/></StackPanel><Button x:Name="btnStart" Content="START OPTIMIZATION" Style="{StaticResource PrimaryButtonStyle}" HorizontalAlignment="Right" Width="220"/></Grid>
    </Grid>
</Window>
"@

# Logic
$reader = New-Object System.Xml.XmlNodeReader $xaml; $window = [Windows.Markup.XamlReader]::Load($reader)
$txtPath = $window.FindName("txtPath"); $btnBrowse = $window.FindName("btnBrowse"); $chkRecursive = $window.FindName("chkRecursive")
$comboFormat = $window.FindName("comboFormat"); $lblQualityVal = $window.FindName("lblQualityVal"); $sliderQuality = $window.FindName("sliderQuality")
$comboResize = $window.FindName("comboResize"); $rbCopy = $window.FindName("rbCopy"); $rbOverwrite = $window.FindName("rbOverwrite"); $chkStrip = $window.FindName("chkStrip")
$chkResume = $window.FindName("chkResume"); $chkCache = $window.FindName("chkCache"); $chkLog = $window.FindName("chkLog")
$statFound = $window.FindName("statFound"); $statSaved = $window.FindName("statSaved"); $statPct = $window.FindName("statPct"); $dgFiles = $window.FindName("dgFiles")
$lblProgress = $window.FindName("lblProgress"); $lblPctProgress = $window.FindName("lblPctProgress"); $progressMain = $window.FindName("progressMain")
$lblEngineStatus = $window.FindName("lblEngineStatus"); $btnStart = $window.FindName("btnStart")

$global:imgFiles = @(); $imgExts = @(".jpg", ".jpeg", ".png", ".webp", ".avif", ".bmp", ".tiff")
$global:logEnabled = $false; $global:logFilePath = ""

function Add-Log { 
    param([string]$msg) 
    $window.Dispatcher.Invoke({ 
        $ts = "$(Get-Date -Format 'HH:mm:ss') - $msg"
        $lblProgress.Text = $msg
        if ($global:logEnabled -and $global:logFilePath) { try { Add-Content -Path $global:logFilePath -Value $ts -ErrorAction SilentlyContinue } catch {} } 
    }) 
}

function Format-Bytes { param([long]$Bytes) if ($Bytes -ge 1GB) { return "$([math]::Round($Bytes / 1GB, 2)) GB" }; if ($Bytes -ge 1MB) { return "$([math]::Round($Bytes / 1MB, 2)) MB" }; if ($Bytes -ge 1KB) { return "$([math]::Round($Bytes / 1KB, 2)) KB" }; return "$Bytes B" }
function Check-Engine { if (Get-Command magick -ErrorAction SilentlyContinue) { $lblEngineStatus.Text = "ImageMagick"; $lblEngineStatus.Foreground = [System.Windows.Media.Brushes]::Green; return "magick" }; $lblEngineStatus.Text = "Native"; $lblEngineStatus.Foreground = [System.Windows.Media.Brushes]::Gray; return "native" }
function Scan-Files {
    $path = $txtPath.Text; if ([string]::IsNullOrWhiteSpace($path) -or -not (Test-Path -LiteralPath $path)) { return }
    $files = Get-ChildItem -LiteralPath $path -File -Recurse:$chkRecursive.IsChecked | Where-Object { $imgExts -contains $_.Extension.ToLower() }
    $global:imgFiles = $files | ForEach-Object { [PSCustomObject]@{ Name=$_.Name; FullName=$_.FullName; Directory=$_.DirectoryName; Extension=$_.Extension; OldSize=(Format-Bytes $_.Length); OldSizeBytes=$_.Length; NewSize="---"; Saving="---"; Status="Queued" } }
    $dgFiles.ItemsSource = [System.Collections.ObjectModel.ObservableCollection[PSCustomObject]]$global:imgFiles; $statFound.Text = $global:imgFiles.Count
}

$txtPath.Text = $PWD.Path; Check-Engine; Scan-Files
$btnBrowse.Add_Click({ Add-Type -AssemblyName System.Windows.Forms; $dialog = New-Object System.Windows.Forms.FolderBrowserDialog; $dialog.SelectedPath = $txtPath.Text; if ($dialog.ShowDialog() -eq "OK") { $txtPath.Text = $dialog.SelectedPath; Scan-Files } })
$sliderQuality.Add_ValueChanged({ $lblQualityVal.Text = "$([int]$sliderQuality.Value)%" })
$chkResume.Add_Click({ if ($chkResume.IsChecked) { $chkCache.IsChecked = $true } }); $chkCache.Add_Click({ if (-not $chkCache.IsChecked) { $chkResume.IsChecked = $false } })

$btnStart.Add_Click({
    if ($global:imgFiles.Count -eq 0) { return }; $btnStart.IsEnabled=$false; $btnBrowse.IsEnabled=$false; $engine = Check-Engine
    $global:logEnabled = $chkLog.IsChecked
    $workDir = Join-Path $txtPath.Text ".Image Optimizer"
    if ($chkCache.IsChecked -or $chkLog.IsChecked) { if (-not (Test-Path $workDir)) { $hd = New-Item -ItemType Directory -Path $workDir -Force; $hd.Attributes = "Directory", "Hidden" } }
    $cacheFile = Join-Path $workDir "Cache.json"; $global:logFilePath = Join-Path $workDir "Log.txt"
    $cache = @{}; if ($chkResume.IsChecked -and (Test-Path $cacheFile)) { try { $json = Get-Content $cacheFile -Raw | ConvertFrom-Json; foreach ($e in $json) { if ($e.Path) { $cache[$e.Path.ToLowerInvariant()] = $e } } } catch {} }

    $config = @{ Quality = [int]$sliderQuality.Value; Format = switch($comboFormat.SelectedIndex){ 1{"webp"}; 2{"jpg"}; 3{"png"}; default{""} }; Resize = switch($comboResize.SelectedIndex){ 1{3840}; 2{2048}; 3{1920}; 4{1280}; default{0} }; Strip = $chkStrip.IsChecked; Mode = if($rbOverwrite.IsChecked){"Overwrite"} else{"Copy"}; CacheEnabled=$chkCache.IsChecked; CacheFile=$cacheFile; Cache=$cache; ResumeEnabled=$chkResume.IsChecked }
    
    $global:processedCount = 0; $global:totalSavedBytes = 0; $global:totalOriginalBytes = 0
    $job = { param($files, $config, $engine)
        foreach ($f in $files) {
            $key = $f.FullName.ToLowerInvariant(); 
            $realFile = Get-Item -LiteralPath "$($f.FullName)"
            $sig = "$($f.OldSizeBytes)|$($realFile.LastWriteTimeUtc.Ticks)"
            if ($config.ResumeEnabled -and $config.Cache.ContainsKey($key)) {
                if ($config.Cache[$key].Signature -eq $sig) { Write-Output @{ Index=[array]::IndexOf($files, $f); Success=$false; Msg="Cached Skip"; Total=$files.Count; File=$f.Name }; continue }
            }

            $res = @{ Success=$false; NewSize=0; Msg="Failed" }; $ext = if($config.Format){ ".$($config.Format)" } else { $f.Extension }; $out = Join-Path $f.Directory ($f.Name.Replace($f.Extension, "") + "_opt" + $ext)
            try {
                if ($engine -eq "magick") { 
                    $magickArgs = @($f.FullName, "-quality", $config.Quality); if($config.Strip){ $magickArgs += "-strip" }; if($config.Resize -gt 0){ $magickArgs += @("-resize", "$($config.Resize)x$($config.Resize)>") }; $magickArgs += $out; Start-Process magick -ArgumentList $magickArgs -NoNewWindow -Wait; if($LASTEXITCODE -eq 0){ $res.Success=$true } 
                } else {
                    $img = [System.Drawing.Image]::FromFile($f.FullName); 
                    $targetFormat = [System.Drawing.Imaging.ImageFormat]::Jpeg
                    if($config.Format -eq "png"){ $targetFormat = [System.Drawing.Imaging.ImageFormat]::Png }
                    $img.Save($out, $targetFormat); $img.Dispose(); $res.Success = $true 
                }
                if ($res.Success -and (Test-Path $out)) { $newSize = (Get-Item $out).Length; if ($newSize -lt $f.OldSizeBytes) { if ($config.Mode -eq "Overwrite") { Remove-Item $f.FullName -Force; Move-Item $out $f.FullName -Force }; $res.NewSize = $newSize } else { Remove-Item $out -Force; $res.Msg = "Size Increase" } }
            } catch { $res.Msg = "Error" }

            if ($config.CacheEnabled) { $config.Cache[$key] = @{ Path=$f.FullName; Signature=$sig; Status=$res.Msg }; $config.Cache.Values | ConvertTo-Json -Depth 4 | Set-Content $config.CacheFile }
            Write-Output @{ Index=[array]::IndexOf($files, $f); Success=$res.Success; NewSize=$res.NewSize; Msg=$res.Msg; Total=$files.Count; File=$f.Name }
        }
    }
    $powershell = [PowerShell]::Create().AddScript($job).AddArgument($global:imgFiles).AddArgument($config).AddArgument($engine); $asyncResult = $powershell.BeginInvoke()
    $timer = New-Object System.Windows.Threading.DispatcherTimer; $timer.Interval = [TimeSpan]::FromMilliseconds(100)
    $timer.Add_Tick({
        if ($asyncResult.IsCompleted) { $timer.Stop(); $btnStart.IsEnabled=$true; $btnBrowse.IsEnabled=$true; Add-Log "Optimization Complete"; return }
        if ($null -ne $powershell -and $null -ne $powershell.Streams.Output) {
            $outputs = $powershell.Streams.Output | Select-Object -Last 10; $powershell.Streams.Output.Clear()
            foreach ($out in $outputs) {
                $item = $global:imgFiles[$out.Index]
                if ($out.Success) { $item.Status = "Done"; $item.NewSize = Format-Bytes $out.NewSize; $saving = $item.OldSizeBytes - $out.NewSize; $item.Saving = "$([Math]::Round(($saving / $item.OldSizeBytes) * 100, 1))%"; $global:totalSavedBytes += $saving; $global:totalOriginalBytes += $item.OldSizeBytes } else { $item.Status = $out.Msg; $item.Saving = "0%" }
                $global:processedCount++; $statSaved.Text = Format-Bytes $global:totalSavedBytes; if ($global:totalOriginalBytes -gt 0) { $statPct.Text = "$([Math]::Round(($global:totalSavedBytes / $global:totalOriginalBytes) * 100, 1))%" }; $pctTotal = [Math]::Round(($global:processedCount / $out.Total) * 100); $progressMain.Value = $pctTotal; $lblPctProgress.Text = "$pctTotal%"; Add-Log "Processing: $($out.File)"
            }
        }
        $dgFiles.Items.Refresh()
    })
    $timer.Start()
})
$window.ShowDialog() | Out-Null