param(
    [string]$InstallDir = "$HOME\.gsp\bin"
)

$ErrorActionPreference = "Stop"

$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$ToolkitDir = Resolve-Path -LiteralPath (Join-Path $ScriptDir "..")
$TargetDir = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($InstallDir)
$TargetExe = Join-Path $TargetDir "gsp.exe"

New-Item -ItemType Directory -Force -Path $TargetDir | Out-Null

Push-Location $ToolkitDir
try {
    go build -o $TargetExe .\cmd\gsp
}
finally {
    Pop-Location
}

$userPath = [Environment]::GetEnvironmentVariable("Path", "User")
$parts = @()
if ($userPath) {
    $parts = $userPath -split ";" | Where-Object { $_ -ne "" }
}

if ($parts -notcontains $TargetDir) {
    $newPath = (($parts + $TargetDir) -join ";")
    [Environment]::SetEnvironmentVariable("Path", $newPath, "User")
    Write-Host "Installed gsp to $TargetExe"
    Write-Host "Added $TargetDir to the user PATH. Open a new terminal before running gsp."
}
else {
    Write-Host "Installed gsp to $TargetExe"
}

& $TargetExe version