# Installs Hobfolk on Windows, from PowerShell:
#
#   irm https://hobfolk.dev/install.ps1 | iex
#
# It finds the processor, downloads the latest installer from https://hobfolk.dev/download, checks its
# SHA-256 against the one the server publishes and runs it silently, for your user only (no admin).
# Run it again to update. $env:HOBFOLK_DOWNLOAD_URL points it at another server (a self-hosted one).

& {
  $ErrorActionPreference = 'Stop'
  $ProgressPreference = 'SilentlyContinue'
  [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12

  $base = if ($env:HOBFOLK_DOWNLOAD_URL) { $env:HOBFOLK_DOWNLOAD_URL.TrimEnd('/') } else { 'https://hobfolk.dev' }
  $arch = if ($env:PROCESSOR_ARCHITEW6432 -eq 'ARM64' -or $env:PROCESSOR_ARCHITECTURE -eq 'ARM64') { 'arm64' } else { 'x64' }
  if (-not [Environment]::Is64BitOperatingSystem) { throw 'Hobfolk needs 64-bit Windows.' }

  # An arm64 installer when there is one; otherwise the x64 one, which Windows on ARM emulates.
  $target = $null
  $sum = $null
  foreach ($candidate in @("win-$arch", 'win-x64') | Select-Object -Unique) {
    try {
      $sum = (Invoke-WebRequest -UseBasicParsing -Uri "$base/download/$candidate.sha256").Content
      if ($sum -is [byte[]]) { $sum = [Text.Encoding]::UTF8.GetString($sum) }
      $target = $candidate
      break
    } catch {
      $status = $_.Exception.Response.StatusCode.value__
      if ($status -ne 404) { throw "Could not reach $base ($($_.Exception.Message)). Check your connection and try again." }
    }
  }
  if (-not $target) { throw "There is no Hobfolk build for Windows at $base yet. See $base/download" }

  $parts = $sum.Trim() -split '\s+', 2
  $expected = $parts[0].ToLowerInvariant()
  $file = $parts[1]
  if ($expected -notmatch '^[0-9a-f]{64}$' -or -not $file -or $file -match '[\\/]' -or $file.StartsWith('.')) { throw 'The server sent an unexpected checksum file.' }

  $dir = Join-Path ([IO.Path]::GetTempPath()) ("hobfolk-" + [Guid]::NewGuid().ToString('N'))
  New-Item -ItemType Directory -Path $dir | Out-Null
  try {
    $path = Join-Path $dir $file
    Write-Host "Downloading $file..."
    Invoke-WebRequest -UseBasicParsing -Uri "$base/download/$target" -OutFile $path
    $actual = (Get-FileHash -Algorithm SHA256 -Path $path).Hash.ToLowerInvariant()
    if ($actual -ne $expected) { throw "The download does not match its SHA-256 (expected $expected, got $actual). Nothing was installed." }
    $updated = Test-Path (Join-Path $env:LOCALAPPDATA 'Programs\Hobfolk\Hobfolk.exe')
    if (Get-Process -Name Hobfolk -ErrorAction SilentlyContinue) { Write-Host 'Hobfolk is open: quit it before opening the new version.' }
    Write-Host 'SHA-256 checked. Installing...'
    $process = Start-Process -FilePath $path -ArgumentList '/S' -Wait -PassThru
    if ($process.ExitCode -ne 0) { throw "The installer ended with code $($process.ExitCode)." }
    Write-Host ''
    if ($updated) {
      Write-Host 'Hobfolk is updated: open it from the Start menu.'
    } else {
      Write-Host 'Hobfolk is installed: open it from the Start menu.'
      Write-Host 'Then sign in with your Hobfolk account, open a folder and ask in one sentence.'
    }
  } finally {
    Remove-Item -Recurse -Force -Path $dir -ErrorAction SilentlyContinue
  }
}