$ErrorActionPreference = "Stop"

$AlloyUrl  = "https://updater.3dnetmedical.com/alloy-installer-windows-amd64.exe"
$ConfigUrl = "https://updater.3dnetmedical.com/alloy.txt"

$Installer = Join-Path $env:TEMP "alloy-installer-windows-amd64.exe"
$ConfigDst = "C:\Program Files\GrafanaLabs\Alloy\config.alloy"

# Check if Alloy is already installed
$AlloyService = Get-Service -Name "Alloy" -ErrorAction SilentlyContinue

if ($AlloyService) {
    Write-Host "Grafana Alloy is already installed. Skipping installation."
}
else {
    # Download installer
    try {
        Write-Host "Downloading Grafana Alloy..."

        Invoke-WebRequest `
            -Uri $AlloyUrl `
            -OutFile $Installer `
            -UseBasicParsing

        if (-not (Test-Path $Installer)) {
            throw "Alloy installer was not downloaded."
        }

        if ((Get-Item $Installer).Length -eq 0) {
            throw "Downloaded Alloy installer is empty."
        }
    }
    catch {
        Write-Error "Failed to download Grafana Alloy. Aborting. $($_.Exception.Message)"
        exit 1
    }

    # Install Alloy
    Write-Host "Installing Grafana Alloy..."

    $process = Start-Process `
        -FilePath $Installer `
        -ArgumentList "/S" `
        -Wait `
        -PassThru

    if ($process.ExitCode -ne 0) {
        Write-Error "Alloy installer failed with exit code $($process.ExitCode). Aborting."
        exit $process.ExitCode
    }

    Remove-Item $Installer -Force -ErrorAction SilentlyContinue

    # Verify service was created
    $AlloyService = Get-Service -Name "Alloy" -ErrorAction SilentlyContinue

    if (-not $AlloyService) {
        Write-Error "Installation completed but the Alloy service was not found. Aborting."
        exit 1
    }
}

# Download configuration
try {
    Write-Host "Downloading Alloy configuration..."

    $TempConfig = Join-Path $env:TEMP "alloy-config.alloy"

    Invoke-WebRequest `
        -Uri $ConfigUrl `
        -OutFile $TempConfig `
        -UseBasicParsing

    if (-not (Test-Path $TempConfig)) {
        throw "Configuration was not downloaded."
    }

    if ((Get-Item $TempConfig).Length -eq 0) {
        throw "Downloaded configuration is empty."
    }

    Copy-Item $TempConfig $ConfigDst -Force
    Remove-Item $TempConfig -Force
}
catch {
    Write-Error "Failed to download/install Alloy configuration. Aborting. $($_.Exception.Message)"
    exit 1
}

# Restart Alloy
try {
    Write-Host "Restarting Alloy..."

    Restart-Service -Name "Alloy" -Force
}
catch {
    Write-Error "Failed to restart Alloy. $($_.Exception.Message)"
    exit 1
}

Write-Host ""
Write-Host "Alloy deployment complete."
Get-Service -Name "Alloy"