# install-innosetup.ps1 — robust silent install of Inno Setup 6 for the Windows runner.
# Idempotent: exits 0 immediately if ISCC.exe is already present.
$ErrorActionPreference = 'Stop'

$candidates = @(
  "${env:ProgramFiles(x86)}\Inno Setup 6\ISCC.exe",
  "$env:ProgramFiles\Inno Setup 6\ISCC.exe"
)
foreach ($c in $candidates) {
  if (Test-Path $c) { Write-Output "ISCC already present: $c"; exit 0 }
}

$url = 'https://jrsoftware.org/download.php/is.exe'
$out = Join-Path $env:TEMP 'innosetup-installer.exe'

Write-Output "Downloading Inno Setup: $url"
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
# -UseBasicParsing avoids the IE-engine dependency that fails under the SYSTEM account.
Invoke-WebRequest -Uri $url -OutFile $out -UseBasicParsing

$size = (Get-Item $out).Length
Write-Output "Downloaded $size bytes"
if ($size -lt 1000000) { throw "Downloaded file too small ($size bytes) - not a valid installer" }

Write-Output "Installing silently..."
$log = Join-Path $env:TEMP 'innosetup-install.log'
$p = Start-Process -FilePath $out -ArgumentList '/VERYSILENT','/SUPPRESSMSGBOXES','/NORESTART','/SP-','/NOICONS',"/LOG=$log" -Wait -PassThru
Write-Output "Installer exit code: $($p.ExitCode)"
if ($p.ExitCode -ne 0) {
  Write-Output "----- install log tail -----"
  if (Test-Path $log) { Get-Content $log -Tail 40 | ForEach-Object { Write-Output $_ } }
  throw "Inno Setup installer failed with exit code $($p.ExitCode)"
}

foreach ($c in $candidates) {
  if (Test-Path $c) { Write-Output "ISCC installed: $c"; exit 0 }
}
throw "ISCC not found after install (looked in: $($candidates -join ', '))"