# Browsentic for Windows, installed in one line:
#
#     irm https://browsentic.com/install.ps1 | iex
#
# Downloads the release installer for this computer's architecture, installs it for this user
# only, and opens the app. The app does the rest from a window. Nothing here needs an
# administrator, and a file PowerShell downloads carries no mark for SmartScreen to warn about.
#
#     $env:BROWSENTIC_VERSION = '0.8.0'   install that release instead of the latest
#     $env:BROWSENTIC_NO_OPEN = '1'       install without opening the app

& {
  $ErrorActionPreference = 'Stop'
  # Windows PowerShell redraws its progress bar for every chunk, which makes a download crawl.
  $ProgressPreference = 'SilentlyContinue'
  $repo = 'imshaikot/browsentic'

  function Say([string] $text) { Write-Host "  $text" }

  try {
    if ([Environment]::OSVersion.Version.Major -lt 10) {
      throw 'the app needs Windows 10 or 11. Use: npx browsentic setup'
    }

    # The computer's own architecture, as Windows records it, rather than this PowerShell's: Windows
    # PowerShell 5.1 can leave RuntimeInformation.OSArchitecture empty, and an x64 PowerShell on an
    # ARM computer is emulated and calls itself AMD64.
    $native = (Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment' -ErrorAction SilentlyContinue).PROCESSOR_ARCHITECTURE
    if (-not $native) { $native = if ($env:PROCESSOR_ARCHITEW6432) { $env:PROCESSOR_ARCHITEW6432 } else { $env:PROCESSOR_ARCHITECTURE } }
    $arch = switch ($native) {
      'ARM64' { 'arm64' }
      'AMD64' { 'x64' }
      default {
        $what = if ($native) { "$native computers" } else { 'this computer' }
        throw "there is no Windows app for $what yet. Use: npx browsentic setup"
      }
    }

    $version = $env:BROWSENTIC_VERSION
    if (-not $version) {
      try {
        $version = (Invoke-RestMethod "https://api.github.com/repos/$repo/releases/latest" -UseBasicParsing).tag_name -replace '^v', ''
      } catch {
        throw 'could not reach github.com to find the latest release. Check the connection and run this again.'
      }
    }
    if ($version -notmatch '^\d+\.\d+\.\d+') {
      throw "could not work out the latest version (got `"$version`"). Set `$env:BROWSENTIC_VERSION = 'x.y.z' and run this again."
    }

    $name = "Browsentic-$version-$arch-setup.exe"
    $url = if ($env:BROWSENTIC_DOWNLOAD_BASE) { "$($env:BROWSENTIC_DOWNLOAD_BASE.TrimEnd('/'))/$name" } else { "https://github.com/$repo/releases/download/v$version/$name" }
    $setup = Join-Path $env:TEMP $name

    Write-Host "`n  Browsentic $version`n"
    Say 'Downloading'
    try {
      Invoke-WebRequest $url -OutFile $setup -UseBasicParsing
    } catch {
      throw "release v$version carries no Windows app for $arch yet. See https://github.com/$repo/releases"
    }

    $running = Get-Process Browsentic -ErrorAction SilentlyContinue
    if ($running) {
      Say 'Closing the running app'
      $running | Stop-Process -Force
      Start-Sleep -Seconds 1
    }

    Say 'Installing for this user'
    $install = Start-Process $setup -ArgumentList '/S' -Wait -PassThru
    Remove-Item $setup -Force -ErrorAction SilentlyContinue
    if ($install.ExitCode -ne 0) {
      throw "the installer stopped with code $($install.ExitCode). Run this again, or download it from https://github.com/$repo/releases"
    }

    $uninstall = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\Browsentic'
    $icon = (Get-ItemProperty $uninstall -ErrorAction SilentlyContinue).DisplayIcon
    $app = if ($icon) { $icon.Trim('"') -replace ',\d+$', '' } else { Join-Path $env:LOCALAPPDATA 'Browsentic\Browsentic.exe' }

    if ($env:BROWSENTIC_NO_OPEN) {
      Write-Host "`n  Done. Open Browsentic from the Start menu, and press `"Set up everything`".`n"
    } else {
      Write-Host "`n  Done. Opening Browsentic: press `"Set up everything`" and it installs the rest.`n"
      Start-Process $app
    }
  } catch {
    Write-Host "`n  browsentic: $($_.Exception.Message)`n" -ForegroundColor Red
  }
}