# lamps.sh/install.ps1 — installs the `lamp` binary on Windows.
#   irm https://lamps.sh/install.ps1 | iex
#
# What it does, in order: download the release binary from GitHub, verify its sha256,
# put it in ~\.lamps\bin, add that to the user PATH. Nothing else.
$ErrorActionPreference = "Stop"

$Repo    = "synsema/lamp"
$Base    = "https://github.com/$Repo/releases/latest/download"
$Home_   = if ($env:LAMPS_HOME) { $env:LAMPS_HOME } else { Join-Path $HOME ".lamps" }
$BinDir  = Join-Path $Home_ "bin"
$Asset   = "lamp-windows-x64.exe"

$arch = $env:PROCESSOR_ARCHITECTURE
if ($arch -ne "AMD64") { throw "lamp install: unsupported architecture: $arch" }

New-Item -ItemType Directory -Force -Path $BinDir | Out-Null
$tmp = Join-Path ([System.IO.Path]::GetTempPath()) ("lamp-" + [System.Guid]::NewGuid().ToString("N"))
New-Item -ItemType Directory -Force -Path $tmp | Out-Null

try {
  Write-Host "downloading $Asset …"
  $exe = Join-Path $tmp "lamp.exe"
  $sum = Join-Path $tmp "lamp.sha256"
  Invoke-WebRequest -Uri "$Base/$Asset" -OutFile $exe -UseBasicParsing
  Invoke-WebRequest -Uri "$Base/$Asset.sha256" -OutFile $sum -UseBasicParsing

  $expected = ((Get-Content $sum -Raw) -split '\s+')[0].ToLower()
  $actual   = (Get-FileHash $exe -Algorithm SHA256).Hash.ToLower()
  if ($expected -ne $actual) { throw "lamp install: sha256 mismatch: expected $expected, got $actual" }

  Unblock-File $exe
  $dest = Join-Path $BinDir "lamp.exe"
  Move-Item -Force $exe $dest
  Write-Host "installed $dest"

  $userPath = [Environment]::GetEnvironmentVariable("Path", "User")
  if (-not (($userPath -split ";") -contains $BinDir)) {
    [Environment]::SetEnvironmentVariable("Path", "$userPath;$BinDir", "User")
    $env:Path = "$env:Path;$BinDir"
    Write-Host "added $BinDir to your user PATH (open a new terminal to pick it up)"
  }

  Write-Host ""
  Write-Host "next — nothing is pulled yet; every lamp is one pull away:"
  Write-Host "  lamp pull git            read-only git, from github.com/synsema/lamps"
  Write-Host "  cd <a git repository>"
  Write-Host "  lamp git log             runs under stdout,env=LAMP_*,exec=git — nothing else"
  Write-Host "  lamp list                what is here, and whether agents get it"
}
finally {
  Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue
}