/**
 * Generiert eine Excel-Datei mit QR-Codes für alle Wasserzähler.
 *
 * Verwendung:
 *   npx tsx scripts/generate-qr-excel.ts
 */

import { readFileSync, existsSync, writeFileSync } from 'fs';
import { resolve } from 'path';
import { createClient } from '@supabase/supabase-js';
import QRCode from 'qrcode';
import ExcelJS from 'exceljs';

// .env.local laden
function loadEnv() {
  const envPath = resolve(__dirname, '..', '.env.local');
  if (!existsSync(envPath)) {
    console.error('FEHLER: .env.local nicht gefunden');
    process.exit(1);
  }
  const content = readFileSync(envPath, 'utf-8');
  for (const line of content.split('\n')) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) continue;
    const eqIndex = trimmed.indexOf('=');
    if (eqIndex === -1) continue;
    const key = trimmed.slice(0, eqIndex).trim();
    const value = trimmed.slice(eqIndex + 1).trim();
    if (!process.env[key]) process.env[key] = value;
  }
}

loadEnv();

const SUPABASE_URL = process.env.NEXT_PUBLIC_SUPABASE_URL!;
const SERVICE_KEY = process.env.SUPABASE_SERVICE_ROLE_KEY!;
const BASE_URL = process.env.NEXT_PUBLIC_BASE_URL || 'https://gemeindeportal.vercel.app';

const supabase = createClient(SUPABASE_URL, SERVICE_KEY);

async function main() {
  console.log('Lade Wasserzähler aus Supabase...');

  const { data: zaehler, error } = await supabase
    .from('wasserzaehler')
    .select('*')
    .order('haushalt_name', { ascending: true });

  if (error || !zaehler || zaehler.length === 0) {
    console.error('Fehler oder keine Daten:', error?.message || 'Keine Einträge');
    process.exit(1);
  }

  console.log(`${zaehler.length} Einträge gefunden. Generiere Excel...\n`);

  const workbook = new ExcelJS.Workbook();
  workbook.creator = 'Gemeindeportal';

  // --- Blatt 1: Übersicht ---
  const listSheet = workbook.addWorksheet('Übersicht', {
    pageSetup: { paperSize: 9, orientation: 'landscape', fitToPage: true, fitToWidth: 1, fitToHeight: 0 },
  });

  listSheet.columns = [
    { header: 'Kundennummer', key: 'kundennummer', width: 18 },
    { header: 'Zählernummer', key: 'zaehlernummer', width: 18 },
    { header: 'Name', key: 'name', width: 28 },
    { header: 'Adresse', key: 'adresse', width: 30 },
    { header: 'Letzter Stand (m³)', key: 'stand', width: 18 },
    { header: 'QR-Code URL', key: 'url', width: 55 },
  ];

  const headerRow = listSheet.getRow(1);
  headerRow.font = { bold: true, size: 11, color: { argb: 'FFFFFFFF' } };
  headerRow.fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FF0D2B4E' } };
  headerRow.alignment = { vertical: 'middle' };
  headerRow.height = 28;

  for (const z of zaehler) {
    const url = `${BASE_URL}/wasserzaehler?token=${z.access_token}`;
    listSheet.addRow({
      kundennummer: z.kundennummer || '',
      zaehlernummer: z.zaehlernummer,
      name: z.haushalt_name,
      adresse: z.adresse || '',
      stand: z.alter_stand,
      url,
    });
  }

  listSheet.autoFilter = {
    from: { row: 1, column: 1 },
    to: { row: zaehler.length + 1, column: 6 },
  };

  // --- Je 1 Blatt pro Kunde mit QR-Code ---
  for (let i = 0; i < zaehler.length; i++) {
    const z = zaehler[i];
    const url = `${BASE_URL}/wasserzaehler?token=${z.access_token}`;

    const qrBuffer = await QRCode.toBuffer(url, {
      width: 400, margin: 2, errorCorrectionLevel: 'M', type: 'png',
    });

    const sheetName = (z.kundennummer || z.haushalt_name || `Kunde ${i + 1}`).slice(0, 31);
    const sheet = workbook.addWorksheet(sheetName, {
      pageSetup: {
        paperSize: 9, orientation: 'portrait',
        horizontalCentered: true, verticalCentered: true,
        margins: { left: 0.7, right: 0.7, top: 1.0, bottom: 1.0, header: 0.3, footer: 0.3 },
      },
    });

    sheet.getColumn(1).width = 5;
    sheet.getColumn(2).width = 25;
    sheet.getColumn(3).width = 35;
    sheet.getColumn(4).width = 5;

    // Titel
    sheet.mergeCells('B2:C2');
    const titleCell = sheet.getCell('B2');
    titleCell.value = 'Gemeindeamt Weißkirchen an der Traun';
    titleCell.font = { bold: true, size: 16, color: { argb: 'FF0D2B4E' } };
    titleCell.alignment = { horizontal: 'center', vertical: 'middle' };
    sheet.getRow(2).height = 30;

    sheet.mergeCells('B3:C3');
    const subtitleCell = sheet.getCell('B3');
    subtitleCell.value = `Wasserzähler-Ablesung ${new Date().getFullYear()}`;
    subtitleCell.font = { size: 12, color: { argb: 'FF666666' } };
    subtitleCell.alignment = { horizontal: 'center', vertical: 'middle' };
    sheet.getRow(3).height = 22;

    // QR Code Bild
    const imageId = workbook.addImage({ buffer: qrBuffer as unknown as ExcelJS.Buffer, extension: 'png' });
    sheet.addImage(imageId, { tl: { col: 1.5, row: 5 }, ext: { width: 250, height: 250 } });

    for (let row = 5; row <= 20; row++) sheet.getRow(row).height = 18;

    // Kundennummer
    const r = 22;
    sheet.mergeCells(`B${r}:C${r}`);
    sheet.getCell(`B${r}`).value = 'Kundennummer';
    sheet.getCell(`B${r}`).font = { size: 10, color: { argb: 'FF999999' } };
    sheet.getCell(`B${r}`).alignment = { horizontal: 'center' };

    sheet.mergeCells(`B${r + 1}:C${r + 1}`);
    sheet.getCell(`B${r + 1}`).value = z.kundennummer || '—';
    sheet.getCell(`B${r + 1}`).font = { bold: true, size: 22 };
    sheet.getCell(`B${r + 1}`).alignment = { horizontal: 'center' };
    sheet.getRow(r + 1).height = 32;

    // Zählernummer
    sheet.mergeCells(`B${r + 3}:C${r + 3}`);
    sheet.getCell(`B${r + 3}`).value = 'Zählernummer';
    sheet.getCell(`B${r + 3}`).font = { size: 10, color: { argb: 'FF999999' } };
    sheet.getCell(`B${r + 3}`).alignment = { horizontal: 'center' };

    sheet.mergeCells(`B${r + 4}:C${r + 4}`);
    sheet.getCell(`B${r + 4}`).value = z.zaehlernummer;
    sheet.getCell(`B${r + 4}`).font = { bold: true, size: 16 };
    sheet.getCell(`B${r + 4}`).alignment = { horizontal: 'center' };
    sheet.getRow(r + 4).height = 26;

    // Name (klein, für Zuordnung)
    sheet.mergeCells(`B${r + 6}:C${r + 6}`);
    sheet.getCell(`B${r + 6}`).value = z.haushalt_name;
    sheet.getCell(`B${r + 6}`).font = { size: 11, color: { argb: 'FF999999' } };
    sheet.getCell(`B${r + 6}`).alignment = { horizontal: 'center' };

    // Anleitung
    sheet.mergeCells(`B${r + 8}:C${r + 8}`);
    sheet.getCell(`B${r + 8}`).value = 'Scannen Sie den QR-Code mit Ihrem Smartphone';
    sheet.getCell(`B${r + 8}`).font = { size: 11, color: { argb: 'FF666666' } };
    sheet.getCell(`B${r + 8}`).alignment = { horizontal: 'center', wrapText: true };

    sheet.mergeCells(`B${r + 9}:C${r + 9}`);
    sheet.getCell(`B${r + 9}`).value = 'um Ihren aktuellen Zählerstand zu melden.';
    sheet.getCell(`B${r + 9}`).font = { size: 11, color: { argb: 'FF666666' } };
    sheet.getCell(`B${r + 9}`).alignment = { horizontal: 'center', wrapText: true };

    console.log(`  ✓ ${z.haushalt_name} (${z.kundennummer || z.zaehlernummer})`);
  }

  const outputPath = resolve(__dirname, '..', `wasserzaehler_qrcodes_${new Date().toISOString().split('T')[0]}.xlsx`);
  await workbook.xlsx.writeFile(outputPath);

  console.log(`\nExcel gespeichert: ${outputPath}`);
  console.log(`\nBlatt 1 "Übersicht": Tabelle mit allen Kunden + URLs`);
  console.log(`Blätter 2-${zaehler.length + 1}: Je 1 Druckseite pro Kunde mit QR-Code`);
}

main().catch((err) => {
  console.error('Fehler:', err);
  process.exit(1);
});