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

function generateBookingNumber(): string {
  const date = new Date();
  const year = date.getFullYear().toString().slice(-2);
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const random = Math.floor(Math.random() * 10000).toString().padStart(4, '0');
  return `STM-${year}${month}-${random}`;
}

export async function POST(request: NextRequest) {
  try {
    const session = await getServerSession(authOptions);

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

    const body = await request.json();

    const eventDate = new Date(body.eventDate);
    const startOfDay = new Date(eventDate);
    startOfDay.setHours(0, 0, 0, 0);
    const endOfDay = new Date(eventDate);
    endOfDay.setHours(23, 59, 59, 999);

    const availablePhotobox = await prisma.photobox.findFirst({
      where: {
        locationId: body.locationId,
        model: body.model,
        active: true,
        NOT: {
          bookings: {
            some: {
              eventDate: {
                gte: startOfDay,
                lte: endOfDay,
              },
              status: {
                in: ['RESERVED', 'CONFIRMED'],
              },
            },
          },
        },
      },
    });

    if (!availablePhotobox) {
      return NextResponse.json(
        { error: 'Keine Fotobox verfügbar für dieses Datum' },
        { status: 409 }
      );
    }

    const booking = await prisma.booking.create({
      data: {
        bookingNumber: generateBookingNumber(),
        locationId: body.locationId,
        photoboxId: availablePhotobox.id,
        status: 'RESERVED',
        
        customerName: body.customerName,
        customerEmail: body.customerEmail,
        customerPhone: body.customerPhone,
        customerAddress: body.customerAddress,
        customerCity: body.customerCity,
        customerZip: body.customerZip,
        
        invoiceType: body.invoiceType,
        companyName: body.companyName,
        
        eventDate: new Date(body.eventDate),
        eventAddress: body.eventAddress,
        eventCity: body.eventCity,
        eventZip: body.eventZip,
        eventLocation: body.eventLocation,
        
        setupTimeStart: new Date(body.setupTimeStart),
        setupTimeLatest: new Date(body.setupTimeLatest),
        dismantleTimeEarliest: body.dismantleTimeEarliest ? new Date(body.dismantleTimeEarliest) : null,
        dismantleTimeLatest: body.dismantleTimeLatest ? new Date(body.dismantleTimeLatest) : null,
        
        calculatedPrice: body.calculatedPrice,
        notes: body.notes,
      },
      include: {
        location: true,
        photobox: true,
      },
    });

    await prisma.notification.create({
      data: {
        type: 'NEW_BOOKING_MANUAL',
        title: 'Neue manuelle Buchung',
        message: `${body.customerName} - ${eventDate.toLocaleDateString('de-DE')}`,
        metadata: {
          bookingId: booking.id,
          bookingNumber: booking.bookingNumber,
        },
      },
    });

    if (Array.isArray(body.equipmentIds) && body.equipmentIds.length > 0) {
      await prisma.bookingEquipment.createMany({
        data: body.equipmentIds.map((eqId: string) => ({
          bookingId: booking.id,
          equipmentId: eqId,
        })),
      });
    }

    try {
      await nextcloudCalendar.syncBookingToCalendar(booking);
    } catch (calError) {
      console.error('Calendar sync error after booking creation:', calError);
    }

    return NextResponse.json({
      success: true,
      booking,
    });
  } catch (error: any) {
    console.error('Booking creation error:', error);
    return NextResponse.json(
      { error: error.message || 'Internal server error' },
      { status: 500 }
    );
  }
}