param(
  [string]$ManifestPath = 'docs/design/assets/a01-vnext/source/a01-psd-manifest.json',
  [string]$OutputPath = 'docs/design/assets/a01-vnext/source/A01-layered-source-v1.psd'
)

$ErrorActionPreference = 'Stop'
$root = Split-Path -Parent $PSScriptRoot
$rootFullPath = [IO.Path]::GetFullPath($root).TrimEnd([IO.Path]::DirectorySeparatorChar) + [IO.Path]::DirectorySeparatorChar

function Resolve-WorkspacePath {
  param(
    [string]$Path,
    [bool]$MustExist
  )

  $candidate = if ([IO.Path]::IsPathRooted($Path)) { $Path } else { Join-Path $root $Path }
  $fullPath = [IO.Path]::GetFullPath($candidate)
  if (-not $fullPath.StartsWith($rootFullPath, [StringComparison]::OrdinalIgnoreCase)) {
    throw "Path must remain inside the workspace: $Path"
  }
  if ($MustExist -and -not (Test-Path -LiteralPath $fullPath -PathType Leaf)) {
    throw "Required file does not exist: $fullPath"
  }
  return $fullPath
}

function ConvertTo-JavaScriptString {
  param([string]$Value)
  $escaped = $Value.Replace('\', '\\').Replace("'", "\'").Replace("`r", '\r').Replace("`n", '\n')
  return "'$escaped'"
}

$resolvedManifest = Resolve-WorkspacePath -Path $ManifestPath -MustExist $true
$resolvedOutput = Resolve-WorkspacePath -Path $OutputPath -MustExist $false
$outputName = [IO.Path]::GetFileName($resolvedOutput)
if ($outputName -notmatch '^A01-layered-source-v[0-9]+\.psd$') {
  throw "PSD output must use a versioned A01 source name: $outputName"
}
if (Test-Path -LiteralPath $resolvedOutput) {
  throw "Refusing to overwrite an existing PSD: $resolvedOutput"
}
if (-not (Get-Process -Name Photoshop -ErrorAction SilentlyContinue)) {
  throw 'Adobe Photoshop must already be running.'
}

$outputDirectory = Split-Path -Parent $resolvedOutput
if (-not (Test-Path -LiteralPath $outputDirectory -PathType Container)) {
  New-Item -ItemType Directory -Path $outputDirectory | Out-Null
}

$jsxPath = Resolve-WorkspacePath -Path 'scripts/photoshop/a01-build-layered-psd.jsx' -MustExist $true
$app = New-Object -ComObject 'Photoshop.Application.150'
$bootstrap = @"
var JIAPU_A01_ROOT = $(ConvertTo-JavaScriptString $rootFullPath.TrimEnd([IO.Path]::DirectorySeparatorChar));
var JIAPU_A01_MANIFEST = $(ConvertTo-JavaScriptString $resolvedManifest);
var JIAPU_A01_PSD = $(ConvertTo-JavaScriptString $resolvedOutput);
$.evalFile(new File($(ConvertTo-JavaScriptString $jsxPath)));
"@
$app.DoJavaScript($bootstrap, @(), 1)

if (-not (Test-Path -LiteralPath $resolvedOutput -PathType Leaf)) {
  throw "Photoshop did not create the expected PSD: $resolvedOutput"
}

Write-Output "A01-LAYERED-PSD BUILD PASS: $resolvedOutput"