param(
  [string]$Root = "E:\WireJS",
  [switch]$SkipValidation
)

$ErrorActionPreference = "Stop"
$PackageRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
$Root = [System.IO.Path]::GetFullPath($Root)

if (-not (Test-Path (Join-Path $Root "packages\ui\components"))) {
  throw "WRNexusJS repository was not found at: $Root"
}

$timestamp = Get-Date -Format "yyyyMMdd-HHmmss"
$backupRoot = Join-Path $Root ".wrnexus\component-showcase-backup-$timestamp"
New-Item -ItemType Directory -Path $backupRoot -Force | Out-Null

$files = @(
  "scripts/generate-ui-component-reference.mjs",
  "packages/ui/component-catalog.json",
  "examples/component-showcase/scripts/generate-showcase.mjs",
  "examples/component-showcase/scripts/showcase-profiles.mjs",
  "examples/component-showcase/public/playground.js",
  "examples/component-showcase/app/styles/global.css",
  "examples/component-showcase/test/showcase.test.ts",
  "examples/component-showcase/README.md"
)

$generatedFiles = @(
  "packages/ui/component-reference.json",
  "packages/ui/COMPONENTS.md",
  "examples/component-showcase/showcase-manifest.json"
)

function Convert-RelativePath([string]$relative) {
  return $relative.Replace("/", [System.IO.Path]::DirectorySeparatorChar)
}

function Backup-Path([string]$relative) {
  $platformPath = Convert-RelativePath $relative
  $source = Join-Path $Root $platformPath
  if (-not (Test-Path $source)) { return }

  $destination = Join-Path $backupRoot $platformPath
  $destinationParent = Split-Path -Parent $destination
  New-Item -ItemType Directory -Path $destinationParent -Force | Out-Null
  Copy-Item $source $destination -Recurse -Force
}

foreach ($relative in $files) { Backup-Path $relative }
foreach ($relative in $generatedFiles) { Backup-Path $relative }
Backup-Path "examples/component-showcase/app/pages"
Backup-Path "examples/component-showcase/app/layouts"

foreach ($relative in $files) {
  $platformPath = Convert-RelativePath $relative
  $source = Join-Path $PackageRoot $platformPath
  $destination = Join-Path $Root $platformPath
  if (-not (Test-Path $source)) {
    throw "Patch file is missing: $source"
  }
  New-Item -ItemType Directory -Path (Split-Path -Parent $destination) -Force | Out-Null
  Copy-Item $source $destination -Force
  Write-Host "Updated $relative" -ForegroundColor Green
}

function Invoke-BunStep {
  param(
    [string]$Label,
    [string[]]$Arguments
  )
  Write-Host "`n$Label" -ForegroundColor Cyan
  & bun @Arguments
  if ($LASTEXITCODE -ne 0) {
    throw "$Label failed with exit code $LASTEXITCODE."
  }
}

Push-Location $Root
try {
  Invoke-BunStep "Generating the current UI component reference" @(
    "run",
    "scripts/generate-ui-component-reference.mjs"
  )

  $showcaseRoot = Join-Path $Root "examples\component-showcase"
  Remove-Item (Join-Path $showcaseRoot ".wrnexus") -Recurse -Force -ErrorAction SilentlyContinue
  Remove-Item (Join-Path $showcaseRoot "dist") -Recurse -Force -ErrorAction SilentlyContinue

  Push-Location $showcaseRoot
  try {
    Invoke-BunStep "Generating component showcase pages and manifest" @("run", "generate")
    if (-not $SkipValidation) {
      Invoke-BunStep "Validating the complete component showcase" @("run", "check")
    }
  }
  finally {
    Pop-Location
  }
}
finally {
  Pop-Location
}

Write-Host "`nComponent showcase update applied successfully." -ForegroundColor Green
Write-Host "Backup: $backupRoot"
if ($SkipValidation) {
  Write-Host "Validation was skipped. Run: bun run --cwd examples/component-showcase check" -ForegroundColor Yellow
}