# Builds a self-contained native app-image (bundled JRE, no Java required on target).
# Requires a JDK 17+ on PATH (needs jar, jdeps, jpackage). Tested with Temurin 21.
# Reuses the ORIGINAL compiled .class files from the shipped exe (identical behavior).
#
# Usage:  powershell -ExecutionPolicy Bypass -File build-app-image.ps1

$ErrorActionPreference = "Stop"
$root    = $PSScriptRoot
$work    = Join-Path $root "build-tmp"
$classes = Join-Path $work "classes"
$dist    = Join-Path $root "dist"

Remove-Item $work, $dist -Recurse -Force -ErrorAction SilentlyContinue
New-Item -ItemType Directory -Force $classes | Out-Null

# 1. Extract the class files (the .exe is a launcher stub + a ZIP/JAR).
Copy-Item (Join-Path $root "VncThumbnailViewerWin1.4.2.exe") (Join-Path $work "app.zip")
Expand-Archive -Path (Join-Path $work "app.zip") -DestinationPath $classes -Force

# 2. Repackage into a runnable JAR, preserving the original manifest (Main-Class).
$jar = Join-Path $work "VncThumbnailViewer.jar"
$jarInput = Join-Path $work "jarinput"
New-Item -ItemType Directory -Force $jarInput | Out-Null
& jar --create --file $jar --manifest (Join-Path $classes "META-INF\MANIFEST.MF") -C $classes .

# 3. Determine the minimal module set for a slim runtime.
$mods = (& jdeps --multi-release 21 --ignore-missing-deps --print-module-deps $jar).Trim()
Write-Host "Modules: $mods"

# 4. Build the native app-image with a jlinked, bundled runtime.
Move-Item $jar $jarInput
& jpackage --type app-image `
    --name "VncThumbnailViewer" --app-version "1.4.2" --vendor "DJC" `
    --input $jarInput --main-jar "VncThumbnailViewer.jar" --main-class "VncThumbnailViewer" `
    --add-modules $mods --dest $dist

Remove-Item $work -Recurse -Force -ErrorAction SilentlyContinue
Write-Host "Done -> $dist\VncThumbnailViewer\VncThumbnailViewer.exe"