DXApp/DXApp.TemplateKitProject/Pages/Invoices/Details.cshtml

@page
@model DXApp.TemplateKitProject.Pages.Invoices.DetailsModel
@{
    ViewData["Title"] = "Rechnungsdetails";

    string FormatFileSize(long bytes)
    {
        if (bytes < 1024) return $"{bytes} Bytes";
        if (bytes < 1024 * 1024) return $"{bytes / 1024.0:N2} KB";
        return $"{bytes / (1024.0 * 1024.0):N2} MB";
    }
}

<h2>📄 Rechnungsdetails</h2>
<a href="/Invoices" class="btn btn-secondary mb-3">← Zurück zur Liste</a>

@if (!string.IsNullOrEmpty(Model.Invoice?.ResultFilePath))
{
    <button class="btn btn-primary mb-3 ms-2"
            onclick="openPdfViewer(@Model.Invoice.Id)">
        📄 Ergebnis anzeigen
    </button>
}

@if (Model.Invoice is null)
{
    <div class="alert alert-danger">Rechnung nicht gefunden.</div>
}
else
{
    <table class="table table-sm table-bordered w-auto">
        <tr><th>ID</th><td>@Model.Invoice.Id</td></tr>
        <tr><th>Rechnungsnummer</th><td>@Model.Invoice.InvoiceNumber</td></tr>
        <tr><th>Rechnungsdatum</th><td>@Model.Invoice.InvoiceDate.ToString("dd.MM.yyyy")</td></tr>
        <tr><th>Verkäufer</th><td>@Model.Invoice.SellerName</td></tr>
        <tr><th>USt-ID Verkäufer</th><td>@Model.Invoice.SellerTaxId</td></tr>
        <tr><th>Käufer</th><td>@Model.Invoice.BuyerName</td></tr>
        <tr><th>Währung</th><td>@Model.Invoice.CurrencyCode</td></tr>
        <tr><th>Steuerbetrag</th><td>@Model.Invoice.TaxAmount.ToString("N2")</td></tr>
        <tr><th>Gesamtbetrag</th><td><strong>@Model.Invoice.TotalAmount.ToString("N2")</strong></td></tr>
        <tr><th>IBAN</th><td>@Model.Invoice.Iban</td></tr>
        <tr><th>Quelle</th><td>@Model.Invoice.SourceType</td></tr>
        <tr><th>Guideline-ID</th><td><code>@Model.Invoice.GuidelineId</code></td></tr>
        <tr><th>Importiert am</th><td>@Model.Invoice.ImportedAt.ToString("dd.MM.yyyy HH:mm")</td></tr>
        <tr>
            <th>Result-PDF</th>
            <td>
                @if (!string.IsNullOrEmpty(Model.Invoice.ResultFilePath))
                {
                    <small class="text-muted">@Model.Invoice.ResultFilePath</small>
                }
                else
                {
                    <span class="text-muted">– nicht vorhanden –</span>
                }
            </td>
        </tr>
    </table>

    @* Anhänge-Sektion *@
    @if (Model.Invoice.Attachments.Any())
    {
        <h4 class="mt-4">📎 Anhänge (@Model.Invoice.Attachments.Count)</h4>
        <div class="list-group">
            @foreach (var attachment in Model.Invoice.Attachments)
            {
                var icon = attachment.IsZugferdXml ? "📋" : "📄";
                var extension = System.IO.Path.GetExtension(attachment.OriginalFileName).ToLowerInvariant();
                icon = extension switch
                {
                    ".xml" => "📋",
                    ".pdf" => "📄",
                    ".jpg" or ".jpeg" or ".png" or ".gif" => "🖼️",
                    ".txt" => "📝",
                    _ => "📎"
                };

                <a href="/Invoices/ViewAttachment?filePath=@Uri.EscapeDataString(attachment.SavedFilePath)" 
                   class="list-group-item list-group-item-action d-flex justify-content-between align-items-center"
                   target="_blank">
                    <div>
                        <span class="me-2">@icon</span>
                        <strong>@attachment.OriginalFileName</strong>
                        @if (attachment.IsZugferdXml)
                        {
                            <span class="badge bg-success ms-2">ZUGFeRD-XML</span>
                        }
                        <br />
                        <small class="text-muted">
                            Größe: @FormatFileSize(attachment.FileSizeBytes) · 
                            Extrahiert: @attachment.ExtractedAt.ToString("dd.MM.yyyy HH:mm")
                        </small>
                    </div>
                    <span class="badge bg-primary">Öffnen</span>
                </a>
            }
        </div>
    }
    else
    {
        <h4 class="mt-4">📎 Anhänge</h4>
        <div class="alert alert-info">Keine Anhänge extrahiert.</div>
    }

@(Html.DevExtreme().Popup()
    .ID("pdf-viewer-popup")
    .Title("PDF Viewer")
    .Width("90%")
    .Height("90%")
    .ShowCloseButton(true)
    .OnHiding("onPdfPopupHiding")
    .ContentTemplate(new JS(@"function() {
        return '<iframe id=""pdf-iframe"" style=""width:100%;height:100%;border:none;""></iframe>';
    }"))
)
}

<script>
    function openPdfViewer(invoiceId) {
        var pdfUrl = window.location.origin + '/Invoices/ViewPdf?id=' + invoiceId;
        var viewerUrl = '/js/pdfjs/web/viewer.html?file=' + encodeURIComponent(pdfUrl);

        var popup = $('#pdf-viewer-popup').dxPopup('instance');

        // onShown sicherstellen dass iframe im DOM ist
        popup.option('onShown', function () {
            $('#pdf-iframe').attr('src', viewerUrl);
        });

        popup.show();
    }

    function onPdfPopupHiding() {
        // iframe src leeren beim Schließen → verhindert dass PDF im Hintergrund weiter läuft
        $('#pdf-iframe').attr('src', '');
    }
</script>