@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="javascript:void(0);" 
                   class="list-group-item list-group-item-action d-flex justify-content-between align-items-center"
                   onclick="openAttachmentViewer('@attachment.OriginalFileName', '@Uri.EscapeDataString(attachment.SavedFilePath)', '@extension')">
                    <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")
    .Shading(true)
    .ShadingColor("rgba(0, 0, 0, 0.5)")
    .ContentTemplate(new JS(@"function() {
        return '<iframe id=""pdf-iframe"" style=""width:100%;height:100%;border:none;""></iframe>';
    }"))
)

@(Html.DevExtreme().Popup()
    .ID("attachment-viewer-popup")
    .Title("Anhang")
    .Width("90%")
    .Height("90%")
    .ShowCloseButton(true)
    .OnHiding("onAttachmentPopupHiding")
    .Shading(true)
    .ShadingColor("rgba(0, 0, 0, 0.5)")
    .ContentTemplate(new JS(@"function() {
        return '<div id=""attachment-content"" style=""width:100%;height:100%;overflow:hidden;display:flex;flex-direction:column;""></div>';
    }"))
)
}

<style>
    /* Z-Index für PDF-Viewer Popup erhöhen - muss höher sein als layout-header (1505) */
    .dx-popup-wrapper.dx-overlay-wrapper {
        z-index: 10500 !important;
    }
    
    .dx-overlay-shader {
        z-index: 10499 !important;
    }
    
    /* Spezifisch für unser PDF-Popup */
    #pdf-viewer-popup .dx-overlay-content {
        z-index: 10500 !important;
    }

    /* CodeMirror soll volle Höhe des Popups nutzen */
    #attachment-content {
        height: 100% !important;
    }

    #attachment-content .CodeMirror {
        height: 100% !important;
        font-size: 14px;
    }
</style>

<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');

        // Z-Index explizit setzen (höher als layout-header mit 1505)
        popup.option('container', undefined); // Default container verwenden
        popup.option('position', { my: 'center', at: 'center', of: window });
        
        // onShown sicherstellen dass iframe im DOM ist
        popup.option('onShown', function () {
            $('#pdf-iframe').attr('src', viewerUrl);
            
            // Z-Index nach dem Öffnen nochmal sicherstellen
            $('.dx-popup-wrapper').css('z-index', '10500');
            $('.dx-overlay-shader').css('z-index', '10499');
        });

        popup.show();
    }

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

    function openAttachmentViewer(fileName, encodedFilePath, extension) {
        var filePath = decodeURIComponent(encodedFilePath);
        var popup = $('#attachment-viewer-popup').dxPopup('instance');
        var $content = $('#attachment-content');

        // Popup-Titel setzen
        popup.option('title', fileName);

        // Z-Index setzen
        popup.option('container', undefined);
        popup.option('position', { my: 'center', at: 'center', of: window });

        // Content basierend auf Dateityp laden
        popup.option('onShown', function () {
            $content.html('<div class="text-center p-5"><div class="spinner-border text-primary" role="status"><span class="visually-hidden">Laden...</span></div></div>');

            // Z-Index sicherstellen
            $('.dx-popup-wrapper').css('z-index', '10500');
            $('.dx-overlay-shader').css('z-index', '10499');

            if (extension === '.pdf') {
                // PDF mit PDF.js anzeigen
                var pdfUrl = window.location.origin + '/Invoices/ViewAttachment?handler=Download&filePath=' + encodedFilePath;
                var viewerUrl = '/js/pdfjs/web/viewer.html?file=' + encodeURIComponent(pdfUrl);
                $content.html('<iframe style="width:100%;height:100%;border:none;" src="' + viewerUrl + '"></iframe>');
            } 
            else if (extension === '.xml' || extension === '.txt') {
                // Text/XML laden und mit Syntax-Highlighting anzeigen
                $.get('/Invoices/ViewAttachment?filePath=' + encodedFilePath, function(data) {
                    if (extension === '.xml') {
                        // CodeMirror für XML - Container leeren
                        $content.html('');
                        
                        // CodeMirror laden (falls noch nicht geladen)
                        if (typeof CodeMirror === 'undefined') {
                            $('<link>')
                                .attr('rel', 'stylesheet')
                                .attr('href', 'https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.16/codemirror.min.css')
                                .appendTo('head');
                            $('<link>')
                                .attr('rel', 'stylesheet')
                                .attr('href', 'https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.16/theme/monokai.min.css')
                                .appendTo('head');
                            
                            $.getScript('https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.16/codemirror.min.js', function() {
                                $.getScript('https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.16/mode/xml/xml.min.js', function() {
                                    initCodeMirror(data);
                                });
                            });
                        } else {
                            initCodeMirror(data);
                        }

                        function initCodeMirror(content) {
                            // CodeMirror direkt in den Container einfügen
                            var editor = CodeMirror($content[0], {
                                value: content,
                                mode: 'xml',
                                lineNumbers: true,
                                readOnly: true,
                                theme: 'monokai',
                                lineWrapping: true,
                                viewportMargin: Infinity
                            });

                            // Höhe explizit setzen nach kurzer Verzögerung
                            setTimeout(function() {
                                editor.setSize('100%', '100%');
                                editor.refresh();
                            }, 100);
                        }
                    } else {
                        // Plain Text
                        $content.html('<pre style="background-color: #f5f5f5; padding: 15px; border-radius: 5px; height: 100%; overflow: auto; margin: 0;">' + 
                            $('<div>').text(data).html() + '</pre>');
                    }
                }).fail(function() {
                    $content.html('<div class="alert alert-danger m-3">Fehler beim Laden der Datei.</div>');
                });
            }
            else if (extension === '.jpg' || extension === '.jpeg' || extension === '.png' || extension === '.gif') {
                // Bild anzeigen
                var imageUrl = window.location.origin + '/Invoices/ViewAttachment?handler=Download&filePath=' + encodedFilePath;
                $content.html('<div class="text-center p-3" style="height: 100%; display: flex; align-items: center; justify-content: center;">' +
                    '<img src="' + imageUrl + '" alt="' + fileName + '" class="img-fluid" style="max-height: 100%; max-width: 100%; object-fit: contain;">' +
                    '</div>');
            }
            else {
                // Nicht unterstützter Typ → Download anbieten
                var downloadUrl = window.location.origin + '/Invoices/ViewAttachment?handler=Download&filePath=' + encodedFilePath;
                $content.html('<div class="alert alert-info m-3">' +
                    '<h5>Dieser Dateityp kann nicht angezeigt werden.</h5>' +
                    '<p>Bitte laden Sie die Datei herunter:</p>' +
                    '<a href="' + downloadUrl + '" class="btn btn-primary" download="' + fileName + '">' +
                    '<i class="dx-icon-download"></i> Datei herunterladen' +
                    '</a></div>');
            }
        });

        popup.show();
    }

    function onAttachmentPopupHiding() {
        // Content leeren
        $('#attachment-content').html('');
    }
</script>