<#
.SYNOPSIS
    Windows-Installer für den Newt-Client (MAIEREDV).
    Features: Winget.pro, NSSM, Heavy-Duty Kill (Taskkill /F /T), Rename-Move-Trick & Auto-Cleanup.
#>
param([string]$mode = "install")

# 1. Stabilität & Encoding
[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"
$LogFile = "$InstallDir\newt_service.log"
$UpdaterTaskName = "MAIEREDV-Newt-Updater"
$GiteaUrl = "https://me-gitea.maieredv.cloud/manuel.maier/update-install-newt/raw/branch/main/install_newt-msp-site-win_v2.ps1"

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

# 3. Umgebung vorbereiten
function Prepare-Environment {
    if (!(Get-Command winget -ErrorAction SilentlyContinue)) {
        Write-Log "Winget fehlt. Installiere..." "Cyan"
        try { Invoke-RestMethod -Uri "https://winget.pro/install.ps1" | Invoke-Expression } catch { exit 1 }
        $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
    }
    if (!(Get-Command nssm -ErrorAction SilentlyContinue)) {
        winget install nssm --silent --accept-package-agreements --accept-source-agreements | Out-Null
        $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
    }
}

# 4. Download & Brutal-Kill mit Rename-Trick
function Download-Newt {
    param($FullVersion)
    $ArchSuffix = if ([Environment]::Is64BitOperatingSystem) { "windows_amd64.exe" } else { "windows_386.exe" }
    $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 }
    
    if (!(Test-Path $Target)) {
        Write-Log "Download $VersionOnly..." "Cyan"
        try { Start-BitsTransfer -Source $Url -Destination $Target -Priority Foreground -ErrorAction Stop }
        catch { Invoke-WebRequest -Uri $Url -OutFile $Target -UseBasicParsing }
    }

    # --- AGGRESSIVER STOPP ---
    $Svc = Get-Service $ServiceName -ErrorAction SilentlyContinue
    if ($Svc -and $Svc.Status -ne 'Stopped') {
        Write-Log "Dienst klemmt (Status: $($Svc.Status)). Deaktiviere Autostart..." "Yellow"
        Set-Service $ServiceName -StartupType Disabled 
        
        # Versuch 1: Sanft
        Stop-Service $ServiceName -Force -ErrorAction SilentlyContinue
        Start-Sleep -Seconds 5

        # Versuch 2: Taskkill Tree (Härter als Stop-Process)
        $Procs = Get-Process -Name "newt*" -ErrorAction SilentlyContinue
        if ($Procs) {
            foreach ($p in $Procs) {
                Write-Log "Sende Hard-Kill (Taskkill /F /T) an PID $($p.Id)..." "Red"
                taskkill.exe /F /T /PID $($p.Id) 2>$null
            }
            Start-Sleep -Seconds 3
        }
    }

    # --- RENAME-TRICK (Falls Datei noch 'In Use' ist) ---
    try {
        if (Test-Path $Symlink) {
            Write-Log "Versuche Datei-Tausch..." "Cyan"
            # Wir versuchen die Datei umzubenennen, falls Überschreiben fehlschlägt
            $TempName = "$Symlink.dead_" + (Get-Date -Format "yyyyMMdd_HHmmss")
            Move-Item -Path $Symlink -Destination $TempName -Force -ErrorAction SilentlyContinue
        }
        Copy-Item -Path $Target -Destination $Symlink -Force
        Write-Log "Datei erfolgreich ersetzt." "Green"
    } catch {
        Write-Log "KRITISCH: Datei blockiert. Update wird nach Reboot aktiv." "Red"
    }

    # Dienst wieder scharf schalten
    Set-Service $ServiceName -StartupType Automatic
    Start-Service $ServiceName -ErrorAction SilentlyContinue
    Write-Log "Dienst neu gestartet." "Green"

    # Cleanup: Alte Versionen UND .dead Leichen entfernen
    Get-ChildItem -Path $InstallDir -Filter "newt_*" | 
        Where-Object { $_.Name -ne "newt_latest.exe" } | 
        Sort-Object LastWriteTime -Descending | 
        Select-Object -Skip 3 | Remove-Item -Force -ErrorAction SilentlyContinue
}

function Setup-Service {
    if (!(Get-Service $ServiceName -ErrorAction SilentlyContinue)) {
        Write-Log "--- Erst-Konfiguration ---" "Yellow"
        $PangolinID = Read-Host "ID"; $PangolinSecret = Read-Host "Secret"; $PangolinEndpoint = Read-Host "Endpoint"
        $ArgList = "--id ${PangolinID} --secret ${PangolinSecret} --endpoint ${PangolinEndpoint}"
        & nssm install $ServiceName "$Symlink" $ArgList
        & nssm set $ServiceName AppStdout "$LogFile"
        & nssm set $ServiceName AppStderr "$LogFile"
        & nssm set $ServiceName AppRotateFiles 1
        & nssm set $ServiceName AppRotateOnline 1
        & nssm set $ServiceName AppRotateBytes 10485760
        Start-Service $ServiceName
    } else {
        # Log-Repair für bestehende Dienste
        & nssm set $ServiceName AppStdout "$LogFile"
        & nssm set $ServiceName AppStderr "$LogFile"
        & nssm set $ServiceName AppRotateFiles 1
        & nssm set $ServiceName AppRotateOnline 1
        & nssm set $ServiceName AppRotateBytes 10485760
    }
}

function Setup-Task {
    $IexCommand = "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; iex ((New-Object System.Net.WebClient).DownloadString('$GiteaUrl'))"
    $Action = New-ScheduledTaskAction -Execute "powershell.exe" -Argument "-NoProfile -ExecutionPolicy Bypass -Command `"$IexCommand`""
    $Trigger = New-ScheduledTaskTrigger -Daily -At 3am
    $Principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest
    Register-ScheduledTask -Action $Action -Trigger $Trigger -Principal $Principal -TaskName $UpdaterTaskName -Force | Out-Null
    Write-Log "Update-Task (IEX) registriert." "Green"
}

# --- Main Logic ---
Prepare-Environment
if (!(Test-Path $Symlink) -or ($mode -eq "install")) {
    $v = (Invoke-RestMethod "https://api.github.com/repos/${Repo}/releases/latest").tag_name
    Download-Newt $v; Setup-Service; Setup-Task
    Write-Log "🚀 Installation fertig!" "Green"
}
elseif ($mode -eq "update" -or (Test-Path $Symlink)) {
    $v = (Invoke-RestMethod "https://api.github.com/repos/${Repo}/releases/latest").tag_name
    $vO = $v.TrimStart('v')
    if (!(Test-Path "${InstallDir}\newt_${vO}.exe")) {
        Write-Log "Neue Version $vO gefunden..." "Cyan"
        Download-Newt $v
    } else {
        Write-Log "System aktuell ($vO)." "Cyan"
        Setup-Service # Log-Fix falls nötig
        if ((Get-Service $ServiceName).Status -ne 'Running') { Start-Service $ServiceName }
    }
}
elseif ($mode -eq "uninstall") {
    if (Get-Service $ServiceName -ErrorAction SilentlyContinue) {
        Set-Service $ServiceName -StartupType Disabled
        taskkill.exe /F /T /IM "newt*" 2>$null
        Stop-Service $ServiceName -Force -ErrorAction SilentlyContinue
        & nssm remove $ServiceName confirm
    }
    Unregister-ScheduledTask -TaskName $UpdaterTaskName -Confirm:$false -ErrorAction SilentlyContinue
    Write-Log "Alles entfernt." "Green"
}