param(
  [string]$Repo = "mithral/DevourUnlocker",
  [string]$Tag = "latest",
  [string]$GameDir = "",
  [switch]$Uninstall
)
$ErrorActionPreference = "Stop"

function Find-GameDir {
  $cands = @(
    "$env:ProgramFiles (x86)/Steam/steamapps/common/Devour",
    "C:/Steam/steamapps/common/Devour",
    "$env:USERPROFILE/.local/share/Steam/steamapps/common/Devour"
  )
  foreach ($c in $cands) { if (Test-Path "$c/DEVOUR.exe") { return $c } }
  $vdf = "$env:ProgramFiles (x86)/Steam/steamapps/libraryfolders.vdf"
  if (Test-Path $vdf) {
    $txt = Get-Content $vdf -Raw
    foreach ($m in [regex]::Matches($txt, '"path"\s+"([^"]+)"')) {
      $p = $m.Groups[1].Value + "/steamapps/common/Devour"
      if (Test-Path "$p/DEVOUR.exe") { return $p }
    }
  }
  return $null
}

if (-not $GameDir) { $GameDir = Find-GameDir }
if (-not $GameDir -or -not (Test-Path "$GameDir/DEVOUR.exe")) {
  Write-Error "Could not find Devour install. Use -GameDir C:/.../Devour"
  exit 1
}
Write-Host "[*] Game dir: $GameDir"

if ($Uninstall) {
  Remove-Item "$GameDir/winhttp.dll" -ErrorAction SilentlyContinue
  Remove-Item "$GameDir/DevourUnlocker.dll" -ErrorAction SilentlyContinue
  if (Test-Path "$GameDir/winhttp.dll.bak") { Move-Item "$GameDir/winhttp.dll.bak" "$GameDir/winhttp.dll" -Force; Write-Host "[*] Restored original" }
  Write-Host "[*] Uninstalled"
  exit 0
}

if ($Tag -eq "latest") {
  $api = "https://api.github.com/repos/$Repo/releases/latest"
  $rel = Invoke-RestMethod -Uri $api
  $Tag = $rel.tag_name
}
Write-Host "[*] Installing $Repo $Tag"
$zipUrl = "https://github.com/$Repo/releases/download/$Tag/DevourUnlocker_winhttp_$Tag.zip"
$tmp = Join-Path $env:TEMP "devour_$Tag"
New-Item -ItemType Directory -Force -Path $tmp | Out-Null
$zip = Join-Path $tmp "pkg.zip"
Invoke-WebRequest -Uri $zipUrl -OutFile $zip
Expand-Archive -Path $zip -DestinationPath $tmp -Force

if (Test-Path "$GameDir/winhttp.dll") {
  Copy-Item "$GameDir/winhttp.dll" "$GameDir/winhttp.dll.bak" -Force
  Write-Host "[*] Backed up winhttp.dll"
}
Copy-Item "$tmp/winhttp.dll" "$GameDir/winhttp.dll" -Force
if (Test-Path "$tmp/DevourUnlocker.dll") { Copy-Item "$tmp/DevourUnlocker.dll" "$GameDir/DevourUnlocker.dll" -Force }
if (-not (Test-Path "$GameDir/DevourUnlocker.json")) {
  if (Test-Path "$tmp/DevourUnlocker.json") { Copy-Item "$tmp/DevourUnlocker.json" "$GameDir/DevourUnlocker.json" }
  else { '{"unlockRobes":true,"unlockCharacters":true}' | Out-File "$GameDir/DevourUnlocker.json" }
}
Write-Host "[*] Installed to $GameDir — press F6 in-game for GUI, F5 to unload"
Remove-Item $tmp -Recurse -Force