/**
 * Modul: Generic CalDAV Sync
 * Zweck: Multi-Account CalDAV synchronization with calendar selection
 * Abhängigkeiten: tsdav, server/db.js, server/services/ics-parser.js
 */

import { createLogger } from '../logger.js';
const log = createLogger('CalDAV');

import * as db from '../db.js';

// Reused functions from apple-calendar.js
import {
  parseICS,
  buildICS,
  escapeICS,
  unescapeICS,
  formatICSDate,
  tzLocalToUTC,
  applyDuration
} from './ics-parser.js';

// --------------------------------------------------------
// Helper Functions
// --------------------------------------------------------

function normalizeCalColor(c) {
  if (!c) return null;
  if (/^#[0-9a-fA-F]{8}$/.test(c)) return c.slice(0, 7); // strip alpha
  if (/^#[0-9a-fA-F]{6}$/.test(c)) return c;
  return null;
}

function upsertExternalCalendar(source, externalId, name, color) {
  const row = db.get().prepare(`
    INSERT INTO external_calendars (source, external_id, name, color)
    VALUES (?, ?, ?, ?)
    ON CONFLICT(source, external_id) DO UPDATE SET
      name  = excluded.name,
      color = excluded.color
    RETURNING id
  `).get(source, externalId, name, color);
  return row.id;
}

// --------------------------------------------------------
// Credentials Helpers
// --------------------------------------------------------

function getAccountById(accountId) {
  return db.get().prepare('SELECT * FROM caldav_accounts WHERE id = ?').get(accountId);
}

function getAllAccounts() {
  return db.get().prepare('SELECT * FROM caldav_accounts').all();
}

// --------------------------------------------------------
// Export placeholder (will be filled in next tasks)
// --------------------------------------------------------

export { };