<#
.SYNOPSIS
    Windows-Installer für den Newt-Client (MAIEREDV Managed Site Client).
    Kompatibel mit Windows Server (BITS-Download & TLS 1.2).
#>
param([string]$mode = "install")

# 1. Stabilität & Encoding sicherstellen
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8

# 2. Konfiguration
$Repo = "fosrl/newt"
$InstallDir = "C:\Program Files\me-msp-newt"
$ServiceName = "MAIEREDV-Managed-Site-Client"
$Symlink = "$InstallDir\newt_latest.exe"
$TaskName = "Newt-Updater"
$GiteaUrl = "https://gitea.vmd55888.de/manuel.maier/update-install-newt/raw/branch/main/install_newt-msp-site_v2.ps1"

# Helfer-Funktionen
function Write-Log($msg, $color = "White") { Write-Host "[$(Get-Date -Format 'HH:mm:ss')] $msg" -ForegroundColor $color }

function Get-LatestVersion {
    try {
        $url = "https://api.github.com/repos/$Repo/releases/latest"
        $json = Invoke-RestMethod -Uri $url -UseBasicParsing
        return $json.tag_name # Gibt z.B. "v1.9.0" zurück
    } catch {
        Write-Log "FEHLER: Konnte Version nicht abrufen." "Red"
        exit 1
    }
}

function Download-Newt {
    param($FullVersion)
    
    $ArchSuffix = if ([Environment]::Is64BitOperatingSystem) { "windows_amd64.exe" } else { "windows_386.exe" }
    
    # URL-Fix: Das 'v' für den Download-Pfad entfernen (v1.9.0 -> 1.9.0)
    $VersionOnly = $FullVersion.TrimStart('v')
    $Url = "https://github.com/$Repo/releases/download/$VersionOnly/newt_$ArchSuffix"
    $Target = "$InstallDir\newt_$VersionOnly.exe"

    if (!(Test-Path $InstallDir)) { New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null }

    Write-Log "Download von: $Url" "Cyan"
    try {
        # BITS umgeht die IE-Sicherheitskonfiguration auf Windows Servern
        Start-BitsTransfer -Source $Url -Destination $Target -ErrorAction Stop
        Copy-Item -Path $Target -Destination $Symlink -Force
        Write-Log "Installation erfolgreich: $Target" "Green"
    } catch {
        Write-Log "FEHLER beim Download: $_" "Red"
        exit 1
    }
}

function Setup-Service {
    if (!(Get-Service $ServiceName -ErrorAction SilentlyContinue)) {
        Write-Log "--- Dienst-Konfiguration ---" "Yellow"
        $PangolinID = Read-Host "Bitte Pangolin ID eingeben"
        $PangolinSecret = Read-Host "Bitte Secret eingeben"
        $PangolinEndpoint = Read-Host "Bitte Endpoint eingeben (z.B. https://pangolin.domain.com)"

        if ([string]::IsNullOrWhiteSpace($PangolinID)) { Write-Log "FEHLER: ID darf nicht leer sein!" "Red"; exit 1 }

        $ArgList = "--id $PangolinID --secret $PangolinSecret --endpoint $PangolinEndpoint"
        # PowerShell Wrapper verhindert Timeouts beim Dienst-Start
        $BinaryPath = "powershell.exe -WindowStyle Hidden -Command `"$Symlink $ArgList`""

        Write-Log "Erstelle Windows Dienst..." "Cyan"
        & sc.exe create $ServiceName binPath= $BinaryPath start= auto DisplayName= "MAIEREDV Managed Site Client"
        Start-Service $ServiceName
    } else {
        Write-Log "Dienst existiert bereits. Starte neu..." "Yellow"
        Restart-Service $ServiceName
    }
}

function Setup-UpdateTask {
    $ActionCommand = "powershell.exe -NoProfile -ExecutionPolicy Bypass -Command `"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; iex ((New-Object System.Net.WebClient).DownloadString('$GiteaUrl')) -mode update`""
    
    $Action = New-ScheduledTaskAction -Execute "powershell.exe" -Argument $ActionCommand
    $Trigger = New-ScheduledTaskTrigger -Daily -At 3am
    
    # Task als SYSTEM-Nutzer registrieren
    Register-ScheduledTask -Action $Action -Trigger $Trigger -TaskName $TaskName -User "SYSTEM" -Force | Out-Null
    Write-Log "Update-Task fuer 03:00 Uhr erstellt." "Green"
}

# --- Ablauf-Steuerung ---
switch ($mode) {
    "install" {
        $v = Get-LatestVersion
        Download-Newt $v
        Setup-Service
        Setup-UpdateTask
        Write-Log "Installation abgeschlossen!" "Green"
    }
    "update" {
        $v = Get-LatestVersion
        $vOnly = $v.TrimStart('v')
        if (Test-Path "$InstallDir\newt_$vOnly.exe") {
            Write-Log "System ist bereits aktuell ($vOnly)." "Cyan"
        } else {
            Download-Newt $v
            Restart-Service $ServiceName
            Write-Log "Update auf $v durchgefuehrt." "Green"
        }
    }
    "uninstall" {
        Write-Log "Deinstallation wird gestartet..." "Yellow"
        if (Get-Service $ServiceName -ErrorAction SilentlyContinue) {
            Stop-Service $ServiceName -Force
            & sc.exe delete $ServiceName
        }
        Unregister-ScheduledTask -TaskName $TaskName -Confirm:$false -ErrorAction SilentlyContinue
        Write-Log "Dienst und Updater entfernt." "Green"
    }
    default {
        Write-Log "Unbekannter Modus: $mode. Nutze install, update oder uninstall." "Red"
    }
}