import { inject, injectable } from "inversify";
import { isValidObjectId, startSession } from "mongoose";

import { CancelOrderItemRepo, CancelOrderRepo, CancelReasonRepo } from "./cancel.repository";
import { CancelOrderDTO, CompeleteCancelOrderDTO, CreateCancelDTO } from "./DTO/cancel.dto";
import { CancelReasonDTO } from "./DTO/cancelReason.dto";
import { CommonMessage, OrderMessage } from "../../common/enums/message.enum";
import { OrderItemsStatus } from "../../common/enums/order.enum";
import { AdminCancelsQueries } from "../../common/types/query.type";
import { BadRequestError } from "../../core/app/app.errors";
import { IOCTYPES } from "../../IOC/ioc.types";
import { OrderItemRefEnum, ReasonRefEnum } from "../fine/models/fine.model";
import { FineRepo } from "../fine/repository/fine.repository";
import { OrderItemRepo } from "../order/order.repository";
import { CancellerRefEnum, CancelStatusEnum } from "./models/cancel.model";
import { StatusEnum } from "../../common/enums/status.enum";
import { FineRuleRepo } from "../fine/repository/fineRule.repository";
import { NotificationService } from "../notification/notification.service";

@injectable()
class CancelService {
  @inject(IOCTYPES.OrderItemRepo) private orderItemRepo: OrderItemRepo;
  @inject(IOCTYPES.CancelOrderRepo) private cancelOrderRepo: CancelOrderRepo;
  @inject(IOCTYPES.CancelOrderItemRepo) private cancelOrderItemRepo: CancelOrderItemRepo;
  @inject(IOCTYPES.CancelReasonRepo) private cancelReasonRepo: CancelReasonRepo;
  @inject(IOCTYPES.FineRuleRepo) private fineRuleRepo: FineRuleRepo;
  @inject(IOCTYPES.FineRepo) private fineRepo: FineRepo;
  @inject(IOCTYPES.NotificationService) notificationService: NotificationService;

  //#######################################################

  async getCancelOrders(userId: string) {
    const cancelOrders = await this.cancelOrderRepo.model.find({ canceller: userId }).sort({ createdAt: -1 });
    return {
      cancelOrders,
    };
  }

  async getAllUserCancelOrders(userId: string) {
    const cancelOrders = await this.cancelOrderRepo.getAllCancelOrdersForUser(userId);
    return {
      cancelOrders,
    };
  }

  //#######################################################
  async getAllCancelOrders(queries: AdminCancelsQueries) {
    const { docs, count } = await this.cancelOrderRepo.getAllCancelsForAdmin(queries);
    const cancelsOrders = docs.map((doc: any) => CancelOrderDTO.transformCancelOrder(doc));
    return {
      cancelsOrders,
      count,
    };
  }

  //#######################################################
  //#######################################################
  async createCancelOrderByUser(userId: string, createCancelDto: CreateCancelDTO) {
    const session = await startSession();
    session.startTransaction();
    try {
      // create Cancel Order
      let total_cancel_price = 0;
      const cancelOrder = await this.cancelOrderRepo.model.create(
        [
          {
            cancellerRef: CancellerRefEnum.User,
            canceller: userId,
            order: createCancelDto.orderId,
            status: CancelStatusEnum.Pending,
          },
        ],
        { session },
      );

      const cancelOrderDoc = cancelOrder[0];

      // Create cancelOrderItems
      for (const item of createCancelDto.items) {
        const orderItem = await this.orderItemRepo.model.findById(item.orderItemId).session(session);
        if (!orderItem) {
          throw new BadRequestError(`OrderItem with ID ${item.orderItemId} not found.`);
        }
        if (orderItem.status === OrderItemsStatus.Shipped || orderItem.status === OrderItemsStatus.Delivered) {
          throw new BadRequestError(`OrderItem with ID ${item.orderItemId} cannot cancel in this position`);
        }
        const shipmentItem = orderItem.shipmentItems.find((shipItem) => shipItem._id?.equals(item.shipmentItemId));
        if (!shipmentItem) {
          throw new BadRequestError(`ShipmentItem with ID ${item.shipmentItemId} not found in OrderItem ${item.orderItemId}.`);
        }

        if (item.quantity > shipmentItem.quantity - shipmentItem.cancelled_quantity! - shipmentItem.returned_quantity!) {
          throw new BadRequestError(`cancel quantity for ShipmentItem ${item.shipmentItemId} exceeds the available quantity.`);
        }

        total_cancel_price += item.quantity * shipmentItem.selling_price;

        await this.cancelOrderItemRepo.model.create(
          [
            {
              cancelOrderId: cancelOrderDoc._id,
              orderItem: item.orderItemId,
              shipmentItem: item.shipmentItemId,
              quantity: item.quantity,
              comment: item.comment,
              reason: item.reason,
              status: OrderItemsStatus.cancelled_user,
            },
          ],
          { session },
        );
        shipmentItem.cancelled_quantity = item.quantity;
        orderItem.status = OrderItemsStatus.cancelled_user;
        orderItem.save({ session });
      }
      cancelOrderDoc.total_price = total_cancel_price;
      await cancelOrderDoc.save({ session });

      await session.commitTransaction();
      await session.endSession();

      return { cancelOrder: cancelOrder[0] };
    } catch (error) {
      await session.abortTransaction();
      await session.endSession();
      throw error;
    }
  }

  //#######################################################
  //#######################################################

  async createCancelOrderBySeller(sellerId: string, createCancelDto: CreateCancelDTO) {
    const session = await startSession();
    session.startTransaction();
    try {
      // create Cancel Order
      let total_cancel_price = 0;
      const cancelOrder = await this.cancelOrderRepo.model.create(
        [
          {
            cancellerRef: CancellerRefEnum.Seller,
            canceller: sellerId,
            order: createCancelDto.orderId,
            status: OrderItemsStatus.cancelled_shop,
          },
        ],
        { session },
      );

      const cancelOrderDoc = cancelOrder[0];

      // Create cancelOrderItems
      for (const item of createCancelDto.items) {
        const orderItem = await this.orderItemRepo.model.findById(item.orderItemId).session(session);
        if (!orderItem) throw new BadRequestError(`آیتم سفارش با شناسه ${item.orderItemId} یافت نشد.`);

        if (orderItem.status === OrderItemsStatus.Shipped || orderItem.status === OrderItemsStatus.Delivered)
          throw new BadRequestError(`آیتم سفارش با شناسه ${item.orderItemId} در این وضعیت قابل لغو نیست.`);

        const shipmentItem = orderItem.shipmentItems.find((shipItem) => shipItem._id?.equals(item.shipmentItemId));
        if (!shipmentItem)
          throw new BadRequestError(`آیتم حمل با شناسه ${item.shipmentItemId} در آیتم سفارش ${item.orderItemId} یافت نشد.`);

        const cancelReason = await this.cancelReasonRepo.model.findById(item.reason);
        if (!cancelReason) {
          throw new BadRequestError(CommonMessage.NotFoundById);
        }

        const cancelledQuantity = shipmentItem.cancelled_quantity || 0;
        const returnedQuantity = shipmentItem.returned_quantity || 0;
        if (item.quantity > shipmentItem.quantity - cancelledQuantity - returnedQuantity) {
          throw new BadRequestError(`Return quantity for ShipmentItem ${item.shipmentItemId} exceeds the available quantity.`);
        }

        total_cancel_price += item.quantity * shipmentItem.selling_price;

        const cancelOrderItem = await this.cancelOrderItemRepo.model.create(
          [
            {
              cancelOrderId: cancelOrderDoc._id,
              orderItem: item.orderItemId,
              shipmentItem: item.shipmentItemId,
              quantity: item.quantity,
              comment: item.comment,
              reason: item.reason,
              status: OrderItemsStatus.cancelled_shop,
            },
          ],
          { session },
        );

        const fineRule = await this.fineRuleRepo.findById(cancelReason.fineRule.toString());
        if (fineRule) {
          const fineAmount = (fineRule.fine_percentage * total_cancel_price) / 100;
          await this.fineRepo.model.create(
            [
              {
                seller: sellerId,
                orderItem: cancelOrderItem[0]._id,
                orderItemRef: OrderItemRefEnum.CancelOrderItem,
                fine_rule: fineRule._id,
                reason: item.reason,
                reasonRef: ReasonRefEnum.Cancel,
                fine_amount: fineAmount,
              },
            ],
            { session },
          );

          await this.notificationService.notifyFine(sellerId, fineAmount, session);
          //TODO : decrease balance from seller wallet
        }

        shipmentItem.cancelled_quantity! += item.quantity;
        if (shipmentItem.cancelled_quantity === shipmentItem.quantity) orderItem.status = OrderItemsStatus.cancelled_shop;

        await orderItem.save({ session });
      }

      cancelOrderDoc.total_price = total_cancel_price;
      await cancelOrderDoc.save({ session });

      await session.commitTransaction();
      await session.endSession();

      return { cancelOrder: cancelOrder[0] };
    } catch (error) {
      await session.abortTransaction();
      await session.endSession();
      throw error;
    }
  }

  //#######################################################
  //#######################################################

  async createCancelOrderByAdmin(adminId: string, createCancelDto: CreateCancelDTO) {
    const session = await startSession();
    session.startTransaction();
    try {
      // create Cancel Order
      let total_cancel_price = 0;
      const cancelOrder = await this.cancelOrderRepo.model.create(
        [
          {
            cancellerRef: CancellerRefEnum.Admin,
            canceller: adminId,
            order: createCancelDto.orderId,
            status: OrderItemsStatus.cancelled_system,
          },
        ],
        { session },
      );

      const cancelOrderDoc = cancelOrder[0];

      // Create cancelOrderItems
      for (const item of createCancelDto.items) {
        const orderItem = await this.orderItemRepo.model.findById(item.orderItemId).session(session);
        if (!orderItem) throw new BadRequestError(`آیتم سفارش با شناسه ${item.orderItemId} یافت نشد.`);

        if (orderItem.status === OrderItemsStatus.Shipped || orderItem.status === OrderItemsStatus.Delivered)
          throw new BadRequestError(`آیتم سفارش با شناسه ${item.orderItemId} در این وضعیت قابل لغو نیست.`);

        const shipmentItem = orderItem.shipmentItems.find((shipItem) => shipItem._id?.equals(item.shipmentItemId));
        if (!shipmentItem)
          throw new BadRequestError(`آیتم حمل با شناسه ${item.shipmentItemId} در آیتم سفارش ${item.orderItemId} یافت نشد.`);

        const cancelReason = await this.cancelReasonRepo.model.findById(item.reason);
        if (!cancelReason) {
          throw new BadRequestError(CommonMessage.NotFoundById);
        }

        const cancelledQuantity = shipmentItem.cancelled_quantity || 0;
        const returnedQuantity = shipmentItem.returned_quantity || 0;
        if (item.quantity > shipmentItem.quantity - cancelledQuantity - returnedQuantity) {
          throw new BadRequestError(`Return quantity for ShipmentItem ${item.shipmentItemId} exceeds the available quantity.`);
        }

        total_cancel_price += item.quantity * shipmentItem.selling_price;

        await this.cancelOrderItemRepo.model.create(
          [
            {
              cancelOrderId: cancelOrderDoc._id,
              orderItem: item.orderItemId,
              shipmentItem: item.shipmentItemId,
              quantity: item.quantity,
              comment: item.comment,
              reason: item.reason,
              status: OrderItemsStatus.cancelled_shop,
            },
          ],
          { session },
        );

        shipmentItem.cancelled_quantity! += item.quantity;
        if (shipmentItem.cancelled_quantity === shipmentItem.quantity) orderItem.status = OrderItemsStatus.cancelled_shop;

        await orderItem.save({ session });
      }

      cancelOrderDoc.total_price = total_cancel_price;
      await cancelOrderDoc.save({ session });

      await session.commitTransaction();
      await session.endSession();

      return { cancelOrder: cancelOrder[0] };
    } catch (error) {
      await session.abortTransaction();
      await session.endSession();
      throw error;
    }
  }

  //#######################################################
  //#######################################################
  async getCancelReasons() {
    const reasons = await this.cancelReasonRepo.model.find({ deleted: false }).populate("fineRule");
    return { reasons };
  }
  //#######################################################
  //#######################################################
  async createCancelReason(cancelReasonDto: CancelReasonDTO) {
    const fineRule = await this.fineRuleRepo.model.findById(cancelReasonDto.fineRule);
    if (!fineRule) {
      throw new BadRequestError(CommonMessage.NotFoundById);
    }
    const newReason = await this.cancelReasonRepo.model.create({
      title: cancelReasonDto.title,
      fineRule: fineRule._id,
    });
    return {
      message: CommonMessage.Created,
      newReason,
    };
  }

  async deleteCancelReason(reasonId: string) {
    if (!isValidObjectId(reasonId)) throw new BadRequestError(CommonMessage.NotValidId);
    await this.cancelReasonRepo.model.findByIdAndUpdate(reasonId, { deleted: true }, { new: true });
    return {
      message: CommonMessage.Deleted,
    };
  }

  async completeCancelOrder(cancelRequestId: string, dto: CompeleteCancelOrderDTO) {
    const { refundComment, refundDate, refundReceipt } = dto;

    const cancelOrder = await this.cancelOrderRepo.model.findByIdAndUpdate(cancelRequestId, {
      status: StatusEnum.Completed,
      refundComment,
      refundDate,
      refundReceipt,
    });
    if (!cancelOrder) throw new BadRequestError(OrderMessage.NotFound);

    return {
      message: OrderMessage.CancelCompleted,
    };
  }

  //#######################################################
  //#######################################################

  //#######################################################
  //#######################################################
  // async updateReturnReason(reasonId: string, updateReasonDto: UpdateReasonDTO) {
  //   if (!isValidObjectId(reasonId)) throw new BadRequestError(CommonMessage.NotValidId);

  //   const updatedReason = await this.returnReasonRep.model.findByIdAndUpdate(reasonId, updateReasonDto, { new: true });
  //   if (!updatedReason) throw new BadRequestError(CommonMessage.NotFoundById);
  //   return {
  //     message: CommonMessage.Updated,
  //     updatedReason,
  //   };
  // }
  //#######################################################
  //#######################################################
}

export { CancelService };