import { NextRequest, NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from '@/lib/auth';
import { db } from '@/lib/db';
import { z } from 'zod';

interface RouteContext {
  params: Promise<{ id: string }>;
}

// Validation schema for updating booking
const updateBookingSchema = z.object({
  status: z.enum(['PENDING', 'CONFIRMED', 'CANCELLED', 'COMPLETED', 'NO_SHOW']).optional(),
  notes: z.string().max(500).optional(),
  cancelReason: z.string().max(500).optional(),
  playerNames: z.array(z.string()).optional(),
});

// GET /api/bookings/[id] - Get a single booking by ID
export async function GET(
  request: NextRequest,
  context: RouteContext
) {
  try {
    const session = await getServerSession(authOptions);

    if (!session?.user) {
      return NextResponse.json(
        { error: 'No autorizado' },
        { status: 401 }
      );
    }

    const { id } = await context.params;

    const booking = await db.booking.findFirst({
      where: {
        id,
        site: {
          organizationId: session.user.organizationId,
        },
      },
      include: {
        court: {
          select: {
            id: true,
            name: true,
            type: true,
            status: true,
            pricePerHour: true,
            features: true,
          },
        },
        client: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
            phone: true,
            level: true,
            notes: true,
          },
        },
        site: {
          select: {
            id: true,
            name: true,
            slug: true,
            address: true,
            phone: true,
            email: true,
            timezone: true,
          },
        },
        createdBy: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
          },
        },
        payments: {
          select: {
            id: true,
            amount: true,
            paymentType: true,
            reference: true,
            notes: true,
            createdAt: true,
          },
          orderBy: {
            createdAt: 'desc',
          },
        },
      },
    });

    if (!booking) {
      return NextResponse.json(
        { error: 'Reserva no encontrada' },
        { status: 404 }
      );
    }

    return NextResponse.json(booking);
  } catch (error) {
    console.error('Error fetching booking:', error);
    return NextResponse.json(
      { error: 'Error al obtener la reserva' },
      { status: 500 }
    );
  }
}

// PUT /api/bookings/[id] - Update a booking
export async function PUT(
  request: NextRequest,
  context: RouteContext
) {
  try {
    const session = await getServerSession(authOptions);

    if (!session?.user) {
      return NextResponse.json(
        { error: 'No autorizado' },
        { status: 401 }
      );
    }

    const { id } = await context.params;

    // Verify booking exists and belongs to user's organization
    const existingBooking = await db.booking.findFirst({
      where: {
        id,
        site: {
          organizationId: session.user.organizationId,
        },
      },
      include: {
        site: true,
      },
    });

    if (!existingBooking) {
      return NextResponse.json(
        { error: 'Reserva no encontrada' },
        { status: 404 }
      );
    }

    // If user is SITE_ADMIN, verify they have access to this site
    if (session.user.role === 'SITE_ADMIN' && session.user.siteId !== existingBooking.siteId) {
      return NextResponse.json(
        { error: 'No tiene permiso para modificar esta reserva' },
        { status: 403 }
      );
    }

    const body = await request.json();

    // Validate input
    const validationResult = updateBookingSchema.safeParse(body);
    if (!validationResult.success) {
      return NextResponse.json(
        {
          error: 'Datos de actualización inválidos',
          details: validationResult.error.flatten().fieldErrors,
        },
        { status: 400 }
      );
    }

    const { status, notes, cancelReason, playerNames } = validationResult.data;

    // Build update data
    const updateData: {
      status?: 'PENDING' | 'CONFIRMED' | 'CANCELLED' | 'COMPLETED' | 'NO_SHOW';
      notes?: string | null;
      cancelReason?: string | null;
      cancelledAt?: Date | null;
      playerNames?: string[];
    } = {};

    if (status !== undefined) {
      updateData.status = status;

      // If cancelling, set cancellation timestamp
      if (status === 'CANCELLED') {
        updateData.cancelledAt = new Date();
        if (cancelReason) {
          updateData.cancelReason = cancelReason;
        }
      }
    }

    if (notes !== undefined) {
      updateData.notes = notes || null;
    }

    if (playerNames !== undefined) {
      updateData.playerNames = playerNames;
    }

    const booking = await db.booking.update({
      where: { id },
      data: updateData,
      include: {
        court: {
          select: {
            id: true,
            name: true,
            type: true,
            pricePerHour: true,
          },
        },
        client: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
            phone: true,
          },
        },
        site: {
          select: {
            id: true,
            name: true,
            timezone: true,
          },
        },
      },
    });

    return NextResponse.json(booking);
  } catch (error) {
    console.error('Error updating booking:', error);
    return NextResponse.json(
      { error: 'Error al actualizar la reserva' },
      { status: 500 }
    );
  }
}

// DELETE /api/bookings/[id] - Cancel/delete a booking
export async function DELETE(
  request: NextRequest,
  context: RouteContext
) {
  try {
    const session = await getServerSession(authOptions);

    if (!session?.user) {
      return NextResponse.json(
        { error: 'No autorizado' },
        { status: 401 }
      );
    }

    const { id } = await context.params;

    // Verify booking exists and belongs to user's organization
    const existingBooking = await db.booking.findFirst({
      where: {
        id,
        site: {
          organizationId: session.user.organizationId,
        },
      },
      include: {
        payments: true,
      },
    });

    if (!existingBooking) {
      return NextResponse.json(
        { error: 'Reserva no encontrada' },
        { status: 404 }
      );
    }

    // If user is SITE_ADMIN, verify they have access to this site
    if (session.user.role === 'SITE_ADMIN' && session.user.siteId !== existingBooking.siteId) {
      return NextResponse.json(
        { error: 'No tiene permiso para cancelar esta reserva' },
        { status: 403 }
      );
    }

    // Check if booking has payments
    const hasPayments = existingBooking.payments.length > 0;

    // Parse optional cancel reason from query params or body
    let cancelReason = 'Cancelada por el administrador';
    try {
      const body = await request.json();
      if (body.cancelReason) {
        cancelReason = body.cancelReason;
      }
    } catch {
      // No body provided, use default reason
    }

    if (hasPayments) {
      // If there are payments, just cancel the booking (soft delete)
      const booking = await db.booking.update({
        where: { id },
        data: {
          status: 'CANCELLED',
          cancelledAt: new Date(),
          cancelReason,
        },
      });

      return NextResponse.json({
        message: 'Reserva cancelada exitosamente',
        booking,
        note: 'La reserva tiene pagos asociados, por lo que fue cancelada en lugar de eliminada',
      });
    } else {
      // If no payments, allow hard delete for pending bookings only
      if (existingBooking.status === 'PENDING') {
        await db.booking.delete({
          where: { id },
        });

        return NextResponse.json({
          message: 'Reserva eliminada exitosamente',
        });
      } else {
        // For non-pending bookings, soft delete
        const booking = await db.booking.update({
          where: { id },
          data: {
            status: 'CANCELLED',
            cancelledAt: new Date(),
            cancelReason,
          },
        });

        return NextResponse.json({
          message: 'Reserva cancelada exitosamente',
          booking,
        });
      }
    }
  } catch (error) {
    console.error('Error deleting booking:', error);
    return NextResponse.json(
      { error: 'Error al cancelar la reserva' },
      { status: 500 }
    );
  }
}