# Installs fetch.exe (the Fetch Agent and CLI) on Windows:
#   irm https://fetch.nightroll.app/install.ps1 | iex
# It downloads the Windows build from https://fetch.nightroll.app/download/, checks its SHA-256 against the release's
# SHA256SUMS, installs it into %LOCALAPPDATA%\Programs\Fetch and adds that folder to your PATH. Rerun it to update.
$ErrorActionPreference = 'Stop'
$ProgressPreference = 'SilentlyContinue'

$base = if ($env:FETCH_DOWNLOAD) { $env:FETCH_DOWNLOAD } else { 'https://fetch.nightroll.app/download' }
$dest = Join-Path $env:LOCALAPPDATA 'Programs\Fetch'

$sums = [Text.Encoding]::UTF8.GetString((Invoke-WebRequest "$base/SHA256SUMS" -UseBasicParsing).RawContentStream.ToArray())
$line = $sums -split "`n" | Where-Object { $_ -match '-windows-x86_64\.zip\s*$' } | Select-Object -First 1
if (-not $line) { throw 'fetch: the current release has no Windows build.' }
$sha, $file = ($line.Trim() -split '\s+')

$tmp = Join-Path ([IO.Path]::GetTempPath()) ("fetch-install-" + [Guid]::NewGuid())
New-Item -ItemType Directory -Path $tmp | Out-Null
try {
  Write-Host "Downloading $file"
  Invoke-WebRequest "$base/$file" -OutFile (Join-Path $tmp $file) -UseBasicParsing
  $got = (Get-FileHash (Join-Path $tmp $file) -Algorithm SHA256).Hash.ToLower()
  if ($got -ne $sha.ToLower()) { throw "fetch: checksum mismatch for $file (expected $sha, got $got). Nothing was installed." }
  Expand-Archive (Join-Path $tmp $file) -DestinationPath $tmp -Force
  New-Item -ItemType Directory -Force -Path $dest | Out-Null
  Copy-Item (Join-Path $tmp 'fetch.exe') (Join-Path $dest 'fetch.exe') -Force
} finally {
  Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue
}

$userPath = [Environment]::GetEnvironmentVariable('Path', 'User')
if (($userPath -split ';') -notcontains $dest) {
  [Environment]::SetEnvironmentVariable('Path', ($userPath.TrimEnd(';') + ";$dest").TrimStart(';'), 'User')
  $env:Path += ";$dest"
  Write-Host "Added $dest to your PATH (open a new terminal for other windows to see it)."
}
Write-Host "Installed $(& (Join-Path $dest 'fetch.exe') --version) at $dest\fetch.exe"
Write-Host ''
Write-Host 'Next: fetch login, then fetch agent install and fetch agent pair. See https://fetch.nightroll.app/download/'