const fs = require('fs');
const js = `
    // --- PDF Export Logic ---
    const btnExportPDF = document.getElementById('btnExportPDF');
    if (btnExportPDF) {
        btnExportPDF.addEventListener('click', async () => {
            const originalText = btnExportPDF.innerText;
            btnExportPDF.innerText = 'Exportiere...';
            btnExportPDF.disabled = true;

            try {
                if (typeof html2canvas === 'undefined' || typeof jspdf === 'undefined') {
                    throw new Error('PDF Bibliotheken (html2canvas, jspdf) sind noch nicht geladen.');
                }

                const mapContainer = document.getElementById('map');
                
                // Add Overlay
                const exportOverlay = document.createElement('div');
                exportOverlay.style.position = 'absolute';
                exportOverlay.style.bottom = '30px';
                exportOverlay.style.left = '30px';
                exportOverlay.style.zIndex = '9999';
                exportOverlay.style.background = 'rgba(255, 255, 255, 0.95)';
                exportOverlay.style.padding = '15px';
                exportOverlay.style.border = '2px solid #333';
                exportOverlay.style.borderRadius = '5px';
                exportOverlay.style.color = '#333';
                exportOverlay.style.fontFamily = 'Arial, sans-serif';
                exportOverlay.style.boxShadow = '0 0 10px rgba(0,0,0,0.3)';
                
                const projName = document.getElementById('projectSelector')?.options[document.getElementById('projectSelector')?.selectedIndex]?.text || 'Unbekannt';
                
                exportOverlay.innerHTML = \`
                    <div style="font-weight: bold; font-size: 1.4rem; margin-bottom: 8px; color: #004a99;">ENWELO Standortplanung</div>
                    <div style="font-size: 1rem; margin-bottom: 12px; font-weight: bold;">Projekt: \${projName}</div>
                    <div style="display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem;">
                        <div style="display: flex; align-items: center; gap: 8px;"><div style="width: 16px; height: 16px; background: #00c8ff; border: 1px dashed #00c8ff; opacity: 0.5;"></div> Rotorüberstreichfläche</div>
                        <div style="display: flex; align-items: center; gap: 8px;"><div style="width: 16px; height: 16px; background: #00aaff; border: 1px dashed #00aaff; opacity: 0.5;"></div> Gebietsumring</div>
                        <div style="display: flex; align-items: center; gap: 8px;"><div style="width: 16px; height: 3px; background: #ff0000;"></div> Abstandslinien</div>
                        <div style="display: flex; align-items: center; gap: 8px;"><div style="width: 16px; height: 16px; border-radius: 50%; background: #00c8ff;"></div> WEA Standort</div>
                    </div>
                \`;
                mapContainer.appendChild(exportOverlay);

                // Wait a tiny bit for DOM to render overlay
                await new Promise(r => setTimeout(r, 100));

                const canvas = await html2canvas(mapContainer, {
                    useCORS: true,
                    allowTaint: true,
                    ignoreElements: (element) => {
                        return element.classList.contains('leaflet-control-zoom');
                    }
                });

                mapContainer.removeChild(exportOverlay);

                const imgData = canvas.toDataURL('image/png');
                const pdf = new jspdf.jsPDF({
                    orientation: 'landscape',
                    unit: 'mm',
                    format: 'a3'
                });

                const pdfWidth = pdf.internal.pageSize.getWidth();
                const pdfHeight = pdf.internal.pageSize.getHeight();

                const imgProps = pdf.getImageProperties(imgData);
                const ratio = imgProps.width / imgProps.height;
                
                let renderWidth = pdfWidth;
                let renderHeight = pdfWidth / ratio;

                if (renderHeight > pdfHeight) {
                    renderHeight = pdfHeight;
                    renderWidth = pdfHeight * ratio;
                }

                // Center image in PDF
                const xOffset = (pdfWidth - renderWidth) / 2;
                const yOffset = (pdfHeight - renderHeight) / 2;

                pdf.addImage(imgData, 'PNG', xOffset, yOffset, renderWidth, renderHeight);
                pdf.save('Karte_Enwelo.pdf');

            } catch (err) {
                console.error('Fehler beim PDF Export:', err);
                alert('Fehler beim PDF Export: ' + err.message);
            } finally {
                btnExportPDF.innerText = originalText;
                btnExportPDF.disabled = false;
            }
        });
    }
`;
fs.appendFileSync('app.js', js);