import { NextRequest, NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from '@/lib/auth';
import { prisma } from '@/lib/prisma';
import { lexofficeService } from '@/lib/lexoffice';
import { nextcloudCalendar } from '@/lib/nextcloud-calendar';

export async function POST(
  request: NextRequest,
  { params }: { params: { id: string } }
) {
  try {
    const session = await getServerSession(authOptions);

    if (!session || session.user.role !== 'ADMIN') {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const bookingId = params.id;

    const booking = await prisma.booking.findUnique({
      where: { id: bookingId },
      include: {
        location: true,
        photobox: true,
        bookingEquipment: {
          include: {
            equipment: true,
          },
        },
      },
    });

    if (!booking) {
      return NextResponse.json(
        { error: 'Buchung nicht gefunden' },
        { status: 404 }
      );
    }

    if (booking.status === 'CONFIRMED') {
      return NextResponse.json(
        { error: 'Buchung ist bereits bestätigt' },
        { status: 400 }
      );
    }

    if (!booking.contractSigned) {
      return NextResponse.json(
        { error: 'Vertrag muss zuerst unterschrieben werden' },
        { status: 400 }
      );
    }

    console.log(`🔄 Bestätige Buchung ${booking.bookingNumber}...`);

    let lexofficeConfirmationId = null;

    if (booking.lexofficeContactId) {
      try {
        console.log('   💼 Erstelle LexOffice Auftragsbestätigung...');
        
        lexofficeConfirmationId = await lexofficeService.createConfirmationFromBooking(
          booking,
          booking.lexofficeContactId
        );
        
        console.log(`   ✅ Auftragsbestätigung erstellt: ${lexofficeConfirmationId}`);
      } catch (error: any) {
        console.error('   ❌ LexOffice Fehler:', error.message);
      }
    }

    const updatedBooking = await prisma.booking.update({
      where: { id: bookingId },
      data: {
        status: 'CONFIRMED',
        lexofficeConfirmationId,
        confirmationSentAt: new Date(),
      },
    });

    try {
      console.log('   📅 Update Nextcloud Kalender...');
      await nextcloudCalendar.syncBookingToCalendar(updatedBooking);
      console.log('   ✅ Kalender aktualisiert');
    } catch (error: any) {
      console.error('   ❌ Kalender-Update Fehler:', error.message);
    }

    await prisma.notification.create({
      data: {
        type: 'BOOKING_CONFIRMED',
        title: 'Buchung bestätigt',
        message: `Buchung ${booking.bookingNumber} für ${booking.customerName} wurde von Admin bestätigt.`,
        metadata: {
          bookingId: booking.id,
          bookingNumber: booking.bookingNumber,
          lexofficeConfirmationId,
        },
      },
    });

    console.log(`✅ Buchung bestätigt: ${booking.bookingNumber}`);

    return NextResponse.json({
      success: true,
      booking: {
        id: updatedBooking.id,
        bookingNumber: updatedBooking.bookingNumber,
        status: updatedBooking.status,
        confirmationSentAt: updatedBooking.confirmationSentAt,
        lexofficeConfirmationId: updatedBooking.lexofficeConfirmationId,
      },
    });

  } catch (error: any) {
    console.error('❌ Bestätigungs-Fehler:', error);
    return NextResponse.json(
      { error: error.message || 'Bestätigung fehlgeschlagen' },
      { status: 500 }
    );
  }
}

export async function GET(
  request: NextRequest,
  { params }: { params: { id: string } }
) {
  try {
    const session = await getServerSession(authOptions);

    if (!session || session.user.role !== 'ADMIN') {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const bookingId = params.id;

    const booking = await prisma.booking.findUnique({
      where: { id: bookingId },
      select: {
        id: true,
        bookingNumber: true,
        status: true,
        contractSigned: true,
        contractSignedAt: true,
        confirmationSentAt: true,
        lexofficeContactId: true,
        lexofficeOfferId: true,
        lexofficeConfirmationId: true,
      },
    });

    if (!booking) {
      return NextResponse.json(
        { error: 'Buchung nicht gefunden' },
        { status: 404 }
      );
    }

    const canConfirm = booking.status !== 'CONFIRMED' && booking.contractSigned;

    return NextResponse.json({ 
      booking,
      canConfirm,
    });

  } catch (error: any) {
    console.error('❌ Buchungs-Status Fehler:', error);
    return NextResponse.json(
      { error: error.message || 'Fehler beim Abrufen des Status' },
      { status: 500 }
    );
  }
}