const { PrismaClient } = require('@prisma/client');
const { createDAVClient } = require('tsdav');
const fs = require('fs');
const path = require('path');

const prisma = new PrismaClient();

function loadEnv() {
  const envPath = path.join(__dirname, '.env');
  const envContent = fs.readFileSync(envPath, 'utf-8');
  const env = {};
  
  envContent.split('\n').forEach(line => {
    const match = line.match(/^([^=:#]+)=(.*)$/);
    if (match) {
      const key = match[1].trim();
      let value = match[2].trim();
      
      if (value.startsWith('"') && value.endsWith('"')) {
        value = value.slice(1, -1);
        value = value.replace(/\\"/g, '"');
        value = value.replace(/\\\\/g, '\\');
      } else if (value.startsWith("'") && value.endsWith("'")) {
        value = value.slice(1, -1);
      }
      
      env[key] = value;
    }
  });
  
  return env;
}

async function syncBookingToCalendar(client, booking, env) {
  try {
    const calendars = await client.fetchCalendars();
    
    if (calendars.length === 0) {
      throw new Error('No calendars found in Nextcloud');
    }

    // Suche nach "Buchungen" Kalender, sonst verwende ersten
    let calendar = calendars.find((cal) => 
      cal.displayName?.toLowerCase().includes('buchung')
    );
    
    if (!calendar) {
      console.log(`   ⚠️  Kein "Buchungen"-Kalender gefunden, verwende: ${calendars[0].displayName}`);
      calendar = calendars[0];
    }

    const startDate = new Date(booking.eventDate);
    const endDate = new Date(startDate.getTime() + 4 * 60 * 60 * 1000);

    const event = {
      summary: `${booking.customerName} - ${booking.location?.name || 'Unbekannt'}`,
      description: `
Buchung #${booking.bookingNumber || booking.id}
Kunde: ${booking.customerName}
E-Mail: ${booking.customerEmail}
Telefon: ${booking.customerPhone || 'N/A'}
Event-Location: ${booking.eventLocation || booking.eventAddress}
Status: ${booking.status}
Fotobox: ${booking.photobox?.model || 'Keine Box'}
Standort: ${booking.location?.name || 'Unbekannt'}
Preis: ${booking.calculatedPrice || 0}€
      `.trim(),
      location: `${booking.eventAddress || ''}, ${booking.eventZip || ''} ${booking.eventCity || ''}`.trim(),
      start: startDate.toISOString(),
      end: endDate.toISOString(),
      uid: `savethemoment-booking-${booking.id}`,
    };

    // Create iCalendar format
    const icsContent = `BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//SaveTheMoment Atlas//EN
BEGIN:VEVENT
UID:${event.uid}
DTSTAMP:${new Date().toISOString().replace(/[-:]/g, '').split('.')[0]}Z
DTSTART:${startDate.toISOString().replace(/[-:]/g, '').split('.')[0]}Z
DTEND:${endDate.toISOString().replace(/[-:]/g, '').split('.')[0]}Z
SUMMARY:${event.summary}
DESCRIPTION:${event.description.replace(/\n/g, '\\n')}
LOCATION:${event.location}
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR`;

    // Check if event already exists
    const calendarObjects = await client.fetchCalendarObjects({
      calendar,
    });

    const existingEvent = calendarObjects.find(obj => 
      obj.data && obj.data.includes(`UID:${event.uid}`)
    );

    if (existingEvent) {
      // Update existing event
      await client.updateCalendarObject({
        calendarObject: {
          url: existingEvent.url,
          data: icsContent,
          etag: existingEvent.etag,
        },
      });
    } else {
      // Create new event
      await client.createCalendarObject({
        calendar,
        filename: `${event.uid}.ics`,
        iCalString: icsContent,
      });
    }

    return true;
  } catch (error) {
    throw error;
  }
}

async function syncExistingBookings() {
  console.log('🔄 Synchronisiere bestehende Buchungen mit Nextcloud...\n');

  const env = loadEnv();
  const serverUrl = env.NEXTCLOUD_URL;
  const username = env.NEXTCLOUD_USERNAME;
  const password = env.NEXTCLOUD_PASSWORD;

  if (!serverUrl || !username || !password) {
    console.error('❌ Missing Nextcloud credentials in .env file!');
    process.exit(1);
  }

  try {
    console.log('⏳ Verbinde mit Nextcloud...');
    const client = await createDAVClient({
      serverUrl: `${serverUrl}/remote.php/dav`,
      credentials: {
        username,
        password,
      },
      authMethod: 'Basic',
      defaultAccountType: 'caldav',
    });
    console.log('✅ Nextcloud-Verbindung hergestellt!\n');

    // Hole alle bestätigten Buchungen
    const bookings = await prisma.booking.findMany({
      where: {
        status: {
          in: ['RESERVED', 'CONFIRMED'],
        },
      },
      include: {
        location: true,
        photobox: true,
      },
      orderBy: {
        eventDate: 'asc',
      },
    });

    console.log(`📊 Gefunden: ${bookings.length} Buchungen\n`);

    if (bookings.length === 0) {
      console.log('ℹ️  Keine Buchungen zum Synchronisieren gefunden.');
      return;
    }

    let synced = 0;
    let failed = 0;

    for (const booking of bookings) {
      try {
        console.log(`📅 Synchronisiere: ${booking.bookingNumber} - ${booking.customerName}`);
        console.log(`   Event: ${new Date(booking.eventDate).toLocaleDateString('de-DE')}`);
        console.log(`   Standort: ${booking.location?.name || 'Unbekannt'}`);
        
        await syncBookingToCalendar(client, booking, env);
        synced++;
        console.log(`   ✅ Erfolgreich!\n`);
      } catch (error) {
        failed++;
        console.error(`   ❌ Fehler: ${error.message}\n`);
      }
    }

    console.log('─'.repeat(50));
    console.log(`✅ Erfolgreich synchronisiert: ${synced}`);
    console.log(`❌ Fehlgeschlagen: ${failed}`);
    console.log(`📊 Gesamt: ${bookings.length}`);
    console.log('\n🎉 Synchronisation abgeschlossen!');
    console.log('   Prüfen Sie Nextcloud → Kalender "Buchungen (Dennis Forte)"');

  } catch (error) {
    console.error('❌ Fehler beim Synchronisieren:', error);
    throw error;
  } finally {
    await prisma.$disconnect();
  }
}

syncExistingBookings()
  .catch((error) => {
    console.error('Fatal error:', error);
    process.exit(1);
  });