param(
  [string]$Url = "https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip",
  [string]$OutDir = "tools/ffmpeg/bin",
  [switch]$DryRun
)

$ErrorActionPreference = "Stop"

$isWindows = $env:OS -eq 'Windows_NT'
if (-not $isWindows) {
  Write-Host "This script is intended for Windows (ffmpeg.exe)." -ForegroundColor Yellow
  exit 1
}

$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).Path
$outDirAbs = (Resolve-Path (Join-Path $repoRoot $OutDir) -ErrorAction SilentlyContinue)
if (-not $outDirAbs) {
  $outDirAbs = Join-Path $repoRoot $OutDir
  New-Item -ItemType Directory -Force -Path $outDirAbs | Out-Null
} else {
  $outDirAbs = $outDirAbs.Path
}

$ffmpegDest = Join-Path $outDirAbs "ffmpeg.exe"

# If already present, do nothing.
if (Test-Path $ffmpegDest) {
  Write-Host "FFmpeg already present: $ffmpegDest"
  exit 0
}

if ($DryRun) {
  Write-Host "Dry run:" -ForegroundColor Cyan
  Write-Host "  Would download: $Url"
  Write-Host "  Would install to: $ffmpegDest"
  exit 0
}

Write-Host "About to download a prebuilt FFmpeg package:" -ForegroundColor Cyan
Write-Host "  $Url"
Write-Host "You are responsible for reviewing the FFmpeg license/compliance for your use case." -ForegroundColor Yellow

$tempRoot = Join-Path $env:TEMP ("radioplayer-ffmpeg-" + [guid]::NewGuid().ToString("N"))
$zipPath = Join-Path $tempRoot "ffmpeg.zip"
$extractDir = Join-Path $tempRoot "extract"

New-Item -ItemType Directory -Force -Path $tempRoot | Out-Null
New-Item -ItemType Directory -Force -Path $extractDir | Out-Null

try {
  Write-Host "Downloading..." -ForegroundColor Cyan
  Invoke-WebRequest -Uri $Url -OutFile $zipPath -UseBasicParsing

  Write-Host "Extracting..." -ForegroundColor Cyan
  Expand-Archive -Path $zipPath -DestinationPath $extractDir -Force

  $candidate = Get-ChildItem -Path $extractDir -Recurse -Filter "ffmpeg.exe" | Where-Object {
    $_.FullName -match "\\bin\\ffmpeg\.exe$"
  } | Select-Object -First 1

  if (-not $candidate) {
    throw "Could not find ffmpeg.exe under extracted content. The archive layout may have changed."
  }

  Copy-Item -Force -Path $candidate.FullName -Destination $ffmpegDest

  Write-Host "Installed FFmpeg to: $ffmpegDest" -ForegroundColor Green
  Write-Host "Next: run 'node tools/copy-ffmpeg.js' (or 'npm run dev:native' / 'npm run build') to bundle it into src-tauri/resources/." -ForegroundColor Green
} finally {
  try { Remove-Item -Recurse -Force -Path $tempRoot -ErrorAction SilentlyContinue } catch {}
}