#Requires -Version 5.1
<#
.SYNOPSIS
    Testet die Verbindung zur Microsoft Graph API.
.DESCRIPTION
    Laedt die Konfiguration und versucht, die letzten 5 E-Mails abzurufen.
    Dient zur Validierung der Azure App Registration.
#>

param(
    [string]$ConfigPath = (Join-Path $PSScriptRoot "..\config")
)

$scriptRoot = $PSScriptRoot
Import-Module (Join-Path $scriptRoot "Logger.psm1") -Force
Import-Module (Join-Path $scriptRoot "GraphHelper.psm1") -Force

# Logger initialisieren
$logDir = Join-Path (Split-Path $ConfigPath -Parent) "logs"
Initialize-Logger -LogDirectory $logDir -Level "Debug"

# Settings laden
$settingsFile = Join-Path $ConfigPath "settings.json"
if (-not (Test-Path $settingsFile)) {
    Write-Host "FEHLER: $settingsFile nicht gefunden!" -ForegroundColor Red
    Write-Host "Bitte zuerst die Azure App Registration einrichten." -ForegroundColor Yellow
    Write-Host "Anleitung: docs\Azure-App-Registration-Anleitung.md" -ForegroundColor Yellow
    exit 1
}

$settings = Get-Content $settingsFile -Raw | ConvertFrom-Json
$settingsHash = @{
    TenantId     = $settings.TenantId
    ClientId     = $settings.ClientId
    ClientSecret = $settings.ClientSecret
    MailboxUser  = $settings.MailboxUser
}

Write-Host "`n=== Mail-Organizer Verbindungstest ===" -ForegroundColor Cyan
Write-Host "Tenant:  $($settings.TenantId)"
Write-Host "Client:  $($settings.ClientId)"
Write-Host "Mailbox: $($settings.MailboxUser)"
Write-Host ""

# Test 1: Token holen
Write-Host "1. Token anfordern... " -NoNewline
try {
    $token = Get-GraphToken -Settings $settingsHash
    Write-Host "OK" -ForegroundColor Green
}
catch {
    Write-Host "FEHLER" -ForegroundColor Red
    Write-Host "   $_" -ForegroundColor Red
    Write-Host "`nPruefe TenantId, ClientId und ClientSecret in settings.json" -ForegroundColor Yellow
    exit 1
}

# Test 2: E-Mails abrufen
Write-Host "2. E-Mails abrufen... " -NoNewline
try {
    $messages = Get-MailMessages -Settings $settingsHash -Top 5
    $count = @($messages.value).Count
    Write-Host "OK ($count E-Mails)" -ForegroundColor Green
}
catch {
    Write-Host "FEHLER" -ForegroundColor Red
    Write-Host "   $_" -ForegroundColor Red
    Write-Host "`nPruefe die API-Berechtigungen (Mail.Read) und Admin Consent" -ForegroundColor Yellow
    exit 1
}

# Ergebnis anzeigen
if ($count -gt 0) {
    Write-Host "`nLetzte E-Mails:" -ForegroundColor Cyan
    foreach ($msg in $messages.value) {
        $date = ([DateTime]$msg.receivedDateTime).ToString("dd.MM.yyyy HH:mm")
        $from = $msg.from.emailAddress.address
        $cats = if ($msg.categories) { " [$($msg.categories -join ', ')]" } else { "" }
        Write-Host "  $date | $from | $($msg.subject)$cats"
    }
}

Write-Host "`n=== Verbindungstest erfolgreich! ===" -ForegroundColor Green
Write-Host "Du kannst jetzt Regeln in config\rules.json anlegen."
Write-Host "Starte mit: .\Process-MailRules.ps1 -DryRun`n"