param(
    [string]$Version = $env:VERSION
)

if (-not $Version) {
    Write-Error "Provide -Version or set VERSION env var, e.g. VERSION=0.1.0"
    exit 1
}

$Version = $Version.TrimStart('v')

$GITEA_BASE = "https://repos.gmgauthier.com/gmgauthier/gralculator"

$OS = if ($IsWindows) { "windows" } elseif ($IsMacOS) { "darwin" } else { "linux" }
$ARCH = if ([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture -eq "X64") { "amd64" } else { "arm64" }

$ASSET = "gralculator-$OS-$ARCH-v$Version.tar.gz"

Write-Host "Installing gralculator $Version for $OS/$ARCH..."

$tempDir = New-TemporaryFile | % { rm $_; mkdir $_ }
try {
    Push-Location $tempDir

    Write-Host "Downloading $ASSET..."
    Invoke-WebRequest -Uri "$GITEA_BASE/releases/download/v$Version/$ASSET" -OutFile "asset.tar.gz"

    Write-Host "Downloading checksums.txt..."
    Invoke-WebRequest -Uri "$GITEA_BASE/releases/download/v$Version/checksums.txt" -OutFile "checksums.txt"

    # Extract (tar on Windows via tar if available, or 7z, but assume tar in modern PS)
    Write-Host "Extracting..."
    tar -xzf asset.tar.gz

    $binary = "gralculator-$OS-$ARCH"
    if ($OS -eq "windows") { $binary += ".exe" }

    $installDir = "$HOME\.local\bin"
    New-Item -ItemType Directory -Force -Path $installDir | Out-Null

    Move-Item -Force $binary "$installDir\gralculator.exe" -ErrorAction SilentlyContinue
    Move-Item -Force $binary "$installDir\gralculator" -ErrorAction SilentlyContinue

    Write-Host "✅ gralculator $Version installed to $installDir\gralculator"
    & "$installDir\gralculator" -v
} finally {
    Pop-Location
    Remove-Item -Recurse -Force $tempDir -ErrorAction SilentlyContinue
}