import prisma from '../config/database';
import { ApiError } from '../middleware/errorHandler';
import logger from '../config/logger';
import { PaymentService } from './payment.service';
import { EquipmentService } from './equipment.service';

// Estados del alquiler
export const RentalStatus = {
  RESERVED: 'RESERVED',
  PICKED_UP: 'PICKED_UP',
  RETURNED: 'RETURNED',
  LATE: 'LATE',
  DAMAGED: 'DAMAGED',
  CANCELLED: 'CANCELLED',
} as const;

export type RentalStatusType = typeof RentalStatus[keyof typeof RentalStatus];

// Interfaces
export interface RentalItemInput {
  itemId: string;
  quantity: number;
}

export interface CreateRentalInput {
  items: RentalItemInput[];
  startDate: Date;
  endDate: Date;
  bookingId?: string;
}

export class EquipmentRentalService {
  /**
   * Crear un nuevo alquiler
   */
  static async createRental(userId: string, data: CreateRentalInput) {
    const { items, startDate, endDate, bookingId } = data;

    // Validar fechas
    const now = new Date();
    if (new Date(startDate) < now) {
      throw new ApiError('La fecha de inicio debe ser futura', 400);
    }

    if (new Date(endDate) <= new Date(startDate)) {
      throw new ApiError('La fecha de fin debe ser posterior a la de inicio', 400);
    }

    // Validar que hay items
    if (!items || items.length === 0) {
      throw new ApiError('Debe seleccionar al menos un item', 400);
    }

    // Verificar booking si se proporciona
    if (bookingId) {
      const booking = await prisma.booking.findFirst({
        where: {
          id: bookingId,
          userId,
        },
      });

      if (!booking) {
        throw new ApiError('Reserva no encontrada', 404);
      }

      // Verificar que las fechas del alquiler coincidan con la reserva
      const bookingDate = new Date(booking.date);
      const rentalStart = new Date(startDate);
      
      if (
        bookingDate.getDate() !== rentalStart.getDate() ||
        bookingDate.getMonth() !== rentalStart.getMonth() ||
        bookingDate.getFullYear() !== rentalStart.getFullYear()
      ) {
        throw new ApiError(
          'Las fechas del alquiler deben coincidir con la fecha de la reserva',
          400
        );
      }
    }

    // Verificar disponibilidad de cada item
    const rentalItems = [];
    let totalCost = 0;
    let totalDeposit = 0;

    for (const itemInput of items) {
      const equipment = await prisma.equipmentItem.findUnique({
        where: {
          id: itemInput.itemId,
          isActive: true,
        },
      });

      if (!equipment) {
        throw new ApiError(
          `Equipamiento no encontrado: ${itemInput.itemId}`,
          404
        );
      }

      // Verificar disponibilidad
      const availability = await EquipmentService.checkAvailability(
        itemInput.itemId,
        new Date(startDate),
        new Date(endDate)
      );

      if (!availability.available || availability.quantityAvailable < itemInput.quantity) {
        throw new ApiError(
          `No hay suficiente stock disponible para: ${equipment.name}`,
          400
        );
      }

      // Calcular duración en horas y días
      const durationMs = new Date(endDate).getTime() - new Date(startDate).getTime();
      const durationHours = Math.ceil(durationMs / (1000 * 60 * 60));
      const durationDays = Math.ceil(durationHours / 24);

      // Calcular costo
      let itemCost = 0;
      if (equipment.dailyRate && durationDays >= 1) {
        itemCost = equipment.dailyRate * durationDays * itemInput.quantity;
      } else if (equipment.hourlyRate) {
        itemCost = equipment.hourlyRate * durationHours * itemInput.quantity;
      }

      totalCost += itemCost;
      totalDeposit += equipment.depositRequired * itemInput.quantity;

      rentalItems.push({
        itemId: itemInput.itemId,
        quantity: itemInput.quantity,
        hourlyRate: equipment.hourlyRate,
        dailyRate: equipment.dailyRate,
        equipment,
      });
    }

    // Crear el alquiler
    const rental = await prisma.equipmentRental.create({
      data: {
        userId,
        bookingId: bookingId || null,
        startDate: new Date(startDate),
        endDate: new Date(endDate),
        totalCost,
        depositAmount: totalDeposit,
        status: RentalStatus.RESERVED,
        items: {
          create: rentalItems.map((ri) => ({
            itemId: ri.itemId,
            quantity: ri.quantity,
            hourlyRate: ri.hourlyRate,
            dailyRate: ri.dailyRate,
          })),
        },
      },
      include: {
        items: {
          include: {
            item: true,
          },
        },
        user: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
          },
        },
      },
    });

    // Actualizar cantidades disponibles
    for (const item of rentalItems) {
      await prisma.equipmentItem.update({
        where: { id: item.itemId },
        data: {
          quantityAvailable: {
            decrement: item.quantity,
          },
        },
      });
    }

    // Crear preferencia de pago en MercadoPago
    let paymentPreference = null;
    try {
      const payment = await PaymentService.createPreference(userId, {
        type: 'EQUIPMENT_RENTAL',
        referenceId: rental.id,
        title: `Alquiler de equipamiento - ${rental.items.length} items`,
        description: `Alquiler de material deportivo desde ${startDate.toLocaleDateString()} hasta ${endDate.toLocaleDateString()}`,
        amount: totalCost,
        metadata: {
          rentalId: rental.id,
          items: rentalItems.map((ri) => ({
            name: ri.equipment.name,
            quantity: ri.quantity,
          })),
        },
      });

      paymentPreference = {
        id: payment.id,
        initPoint: payment.initPoint,
        sandboxInitPoint: payment.sandboxInitPoint,
      };

      // Actualizar rental con el paymentId
      await prisma.equipmentRental.update({
        where: { id: rental.id },
        data: {
          paymentId: payment.paymentId,
        },
      });
    } catch (error) {
      logger.error('Error creando preferencia de pago para alquiler:', error);
      // No fallar el alquiler si el pago falla, pero informar
    }

    logger.info(`Alquiler creado: ${rental.id} para usuario ${userId}`);

    return {
      rental: {
        id: rental.id,
        startDate: rental.startDate,
        endDate: rental.endDate,
        totalCost: rental.totalCost,
        depositAmount: rental.depositAmount,
        status: rental.status,
        items: rental.items.map((ri) => ({
          id: ri.id,
          quantity: ri.quantity,
          item: {
            id: ri.item.id,
            name: ri.item.name,
            category: ri.item.category,
            brand: ri.item.brand,
            imageUrl: ri.item.imageUrl,
          },
        })),
      },
      user: rental.user,
      payment: paymentPreference,
    };
  }

  /**
   * Procesar webhook de pago de MercadoPago
   */
  static async processPaymentWebhook(payload: any) {
    // El webhook es procesado por PaymentService
    // Aquí podemos hacer acciones adicionales si es necesario
    logger.info('Webhook de pago para alquiler procesado', { payload });
    return { processed: true };
  }

  /**
   * Actualizar estado del alquiler después del pago
   */
  static async confirmRentalPayment(rentalId: string) {
    const rental = await prisma.equipmentRental.findUnique({
      where: { id: rentalId },
    });

    if (!rental) {
      throw new ApiError('Alquiler no encontrado', 404);
    }

    if (rental.status !== RentalStatus.RESERVED) {
      throw new ApiError('El alquiler ya no está en estado reservado', 400);
    }

    // El alquiler se mantiene en RESERVED hasta que se retire el material
    logger.info(`Pago confirmado para alquiler: ${rentalId}`);

    return rental;
  }

  /**
   * Obtener mis alquileres
   */
  static async getMyRentals(userId: string) {
    const rentals = await prisma.equipmentRental.findMany({
      where: { userId },
      include: {
        items: {
          include: {
            item: {
              select: {
                id: true,
                name: true,
                category: true,
                brand: true,
                imageUrl: true,
              },
            },
          },
        },
        booking: {
          select: {
            id: true,
            date: true,
            startTime: true,
            endTime: true,
            court: {
              select: {
                name: true,
              },
            },
          },
        },
      },
      orderBy: {
        createdAt: 'desc',
      },
    });

    return rentals.map((rental) => ({
      id: rental.id,
      startDate: rental.startDate,
      endDate: rental.endDate,
      totalCost: rental.totalCost,
      depositAmount: rental.depositAmount,
      depositReturned: rental.depositReturned,
      status: rental.status,
      pickedUpAt: rental.pickedUpAt,
      returnedAt: rental.returnedAt,
      items: rental.items.map((ri) => ({
        id: ri.id,
        quantity: ri.quantity,
        item: ri.item,
      })),
      booking: rental.booking,
    }));
  }

  /**
   * Obtener detalle de un alquiler
   */
  static async getRentalById(id: string, userId?: string) {
    const rental = await prisma.equipmentRental.findUnique({
      where: { id },
      include: {
        items: {
          include: {
            item: true,
          },
        },
        user: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
            phone: true,
          },
        },
        booking: {
          select: {
            id: true,
            date: true,
            startTime: true,
            endTime: true,
            court: {
              select: {
                name: true,
              },
            },
          },
        },
      },
    });

    if (!rental) {
      throw new ApiError('Alquiler no encontrado', 404);
    }

    // Si se proporciona userId, verificar que sea el dueño
    if (userId && rental.userId !== userId) {
      throw new ApiError('No tienes permiso para ver este alquiler', 403);
    }

    return rental;
  }

  /**
   * Entregar material (pickup) - Admin
   */
  static async pickUpRental(rentalId: string, adminId: string) {
    const rental = await prisma.equipmentRental.findUnique({
      where: { id: rentalId },
      include: {
        items: {
          include: {
            item: true,
          },
        },
        user: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
          },
        },
      },
    });

    if (!rental) {
      throw new ApiError('Alquiler no encontrado', 404);
    }

    if (rental.status !== RentalStatus.RESERVED) {
      throw new ApiError(
        `No se puede entregar el material. Estado actual: ${rental.status}`,
        400
      );
    }

    const updated = await prisma.equipmentRental.update({
      where: { id: rentalId },
      data: {
        status: RentalStatus.PICKED_UP,
        pickedUpAt: new Date(),
      },
      include: {
        items: {
          include: {
            item: {
              select: {
                id: true,
                name: true,
                category: true,
              },
            },
          },
        },
      },
    });

    logger.info(`Material entregado para alquiler: ${rentalId} por admin ${adminId}`);

    return {
      rental: updated,
      user: rental.user,
    };
  }

  /**
   * Devolver material - Admin
   */
  static async returnRental(
    rentalId: string,
    adminId: string,
    condition?: string,
    depositReturned?: number
  ) {
    const rental = await prisma.equipmentRental.findUnique({
      where: { id: rentalId },
      include: {
        items: {
          include: {
            item: true,
          },
        },
      },
    });

    if (!rental) {
      throw new ApiError('Alquiler no encontrado', 404);
    }

    if (rental.status !== RentalStatus.PICKED_UP && rental.status !== RentalStatus.LATE) {
      throw new ApiError(
        `No se puede devolver el material. Estado actual: ${rental.status}`,
        400
      );
    }

    // Determinar nuevo estado
    let newStatus: RentalStatusType = RentalStatus.RETURNED;
    const notes = [];

    if (condition) {
      notes.push(`Condición al devolver: ${condition}`);
      if (condition === 'DAMAGED') {
        newStatus = RentalStatus.DAMAGED;
      }
    }

    // Verificar si está vencido
    const now = new Date();
    if (now > new Date(rental.endDate) && newStatus !== RentalStatus.DAMAGED) {
      newStatus = RentalStatus.LATE;
    }

    const depositReturnAmount = depositReturned ?? rental.depositAmount;

    const updated = await prisma.equipmentRental.update({
      where: { id: rentalId },
      data: {
        status: newStatus,
        returnedAt: now,
        depositReturned: depositReturnAmount,
        notes: notes.length > 0 ? notes.join(' | ') : undefined,
      },
      include: {
        items: {
          include: {
            item: true,
          },
        },
        user: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
          },
        },
      },
    });

    // Restaurar cantidades disponibles
    for (const item of rental.items) {
      await prisma.equipmentItem.update({
        where: { id: item.itemId },
        data: {
          quantityAvailable: {
            increment: item.quantity,
          },
        },
      });
    }

    logger.info(`Material devuelto para alquiler: ${rentalId} por admin ${adminId}`);

    return {
      rental: updated,
      user: updated.user,
      depositReturned: depositReturnAmount,
    };
  }

  /**
   * Cancelar alquiler
   */
  static async cancelRental(rentalId: string, userId: string) {
    const rental = await prisma.equipmentRental.findUnique({
      where: { id: rentalId },
      include: {
        items: true,
      },
    });

    if (!rental) {
      throw new ApiError('Alquiler no encontrado', 404);
    }

    // Verificar que sea el dueño
    if (rental.userId !== userId) {
      throw new ApiError('No tienes permiso para cancelar este alquiler', 403);
    }

    // Solo se puede cancelar si está RESERVED
    if (rental.status !== RentalStatus.RESERVED) {
      throw new ApiError(
        `No se puede cancelar el alquiler. Estado actual: ${rental.status}`,
        400
      );
    }

    const updated = await prisma.equipmentRental.update({
      where: { id: rentalId },
      data: {
        status: RentalStatus.CANCELLED,
      },
    });

    // Restaurar cantidades disponibles
    for (const item of rental.items) {
      await prisma.equipmentItem.update({
        where: { id: item.itemId },
        data: {
          quantityAvailable: {
            increment: item.quantity,
          },
        },
      });
    }

    logger.info(`Alquiler cancelado: ${rentalId} por usuario ${userId}`);

    return updated;
  }

  /**
   * Obtener alquileres vencidos (admin)
   */
  static async getOverdueRentals() {
    const now = new Date();

    const overdue = await prisma.equipmentRental.findMany({
      where: {
        endDate: {
          lt: now,
        },
        status: {
          in: [RentalStatus.RESERVED, RentalStatus.PICKED_UP],
        },
      },
      include: {
        items: {
          include: {
            item: {
              select: {
                id: true,
                name: true,
                category: true,
              },
            },
          },
        },
        user: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
            phone: true,
          },
        },
      },
      orderBy: {
        endDate: 'asc',
      },
    });

    // Actualizar estado a LATE para los que están PICKED_UP
    for (const rental of overdue) {
      if (rental.status === RentalStatus.PICKED_UP) {
        await prisma.equipmentRental.update({
          where: { id: rental.id },
          data: { status: RentalStatus.LATE },
        });
      }
    }

    return overdue.map((rental) => ({
      ...rental,
      overdueHours: Math.floor(
        (now.getTime() - new Date(rental.endDate).getTime()) / (1000 * 60 * 60)
      ),
    }));
  }

  /**
   * Obtener todos los alquileres (admin)
   */
  static async getAllRentals(filters?: { status?: RentalStatusType; userId?: string }) {
    const where: any = {};

    if (filters?.status) {
      where.status = filters.status;
    }

    if (filters?.userId) {
      where.userId = filters.userId;
    }

    const rentals = await prisma.equipmentRental.findMany({
      where,
      include: {
        items: {
          include: {
            item: {
              select: {
                id: true,
                name: true,
                category: true,
              },
            },
          },
        },
        user: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
            email: true,
          },
        },
      },
      orderBy: {
        createdAt: 'desc',
      },
    });

    return rentals;
  }

  /**
   * Obtener estadísticas de alquileres
   */
  static async getRentalStats() {
    const [
      totalRentals,
      activeRentals,
      reservedRentals,
      returnedRentals,
      lateRentals,
      damagedRentals,
      totalRevenue,
    ] = await Promise.all([
      prisma.equipmentRental.count(),
      prisma.equipmentRental.count({ where: { status: RentalStatus.PICKED_UP } }),
      prisma.equipmentRental.count({ where: { status: RentalStatus.RESERVED } }),
      prisma.equipmentRental.count({ where: { status: RentalStatus.RETURNED } }),
      prisma.equipmentRental.count({ where: { status: RentalStatus.LATE } }),
      prisma.equipmentRental.count({ where: { status: RentalStatus.DAMAGED } }),
      prisma.equipmentRental.aggregate({
        _sum: {
          totalCost: true,
        },
        where: {
          status: {
            in: [RentalStatus.PICKED_UP, RentalStatus.RETURNED],
          },
        },
      }),
    ]);

    return {
      total: totalRentals,
      byStatus: {
        reserved: reservedRentals,
        active: activeRentals,
        returned: returnedRentals,
        late: lateRentals,
        damaged: damagedRentals,
      },
      totalRevenue: totalRevenue._sum.totalCost || 0,
    };
  }
}

export default EquipmentRentalService;