param(
    [Parameter(Mandatory = $true)]
    [string]$SourcePath,

    [Parameter(Mandatory = $true)]
    [string]$InstallPath,

    [string]$EventSource = "BizTalkMonitorConfigGenerator",
    [string]$EventLogName = "Application",
    [switch]$RegisterEventSource,
    [switch]$CreateBackup
)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

function Write-Info {
    param([string]$Message)
    Write-Host "[INFO] $Message"
}

if (-not (Test-Path -LiteralPath $SourcePath)) {
    throw "SourcePath '$SourcePath' existiert nicht."
}

$sourceFullPath = (Resolve-Path -LiteralPath $SourcePath).Path
$installFullPath = [System.IO.Path]::GetFullPath($InstallPath)

Write-Info "Quelldateien: $sourceFullPath"
Write-Info "Zielverzeichnis: $installFullPath"

if (Test-Path -LiteralPath $installFullPath) {
    if ($CreateBackup) {
        $backupRoot = Join-Path -Path ([System.IO.Path]::GetDirectoryName($installFullPath)) -ChildPath ((Split-Path -Path $installFullPath -Leaf) + '_backup_' + (Get-Date -Format 'yyyyMMdd_HHmmss'))
        Write-Info "Erstelle Backup unter $backupRoot"
        Copy-Item -Path (Join-Path $installFullPath '*') -Destination $backupRoot -Recurse -Force -ErrorAction SilentlyContinue
    }
}
else {
    New-Item -Path $installFullPath -ItemType Directory | Out-Null
}

Write-Info "Kopiere Dateien..."
Copy-Item -Path (Join-Path $sourceFullPath '*') -Destination $installFullPath -Recurse -Force
New-Item -Path (Join-Path $installFullPath 'logs') -ItemType Directory -Force | Out-Null

if ($RegisterEventSource) {
    $registerScript = Join-Path -Path $PSScriptRoot -ChildPath 'register-event-source.ps1'
    if (-not (Test-Path -LiteralPath $registerScript)) {
        throw "register-event-source.ps1 wurde nicht gefunden: $registerScript"
    }

    Write-Info "Registriere Event Source '$EventSource' im Log '$EventLogName'"
    & $registerScript -Source $EventSource -LogName $EventLogName
}

Write-Info 'Installation des BizTalkMonitorConfigGenerator abgeschlossen.'
Write-Info 'Prüfen Sie nun generator-settings.json und führen Sie einen Testlauf aus.'