import { BadRequestException, Injectable, Logger } from "@nestjs/common";
import { DataSource, FindOptionsWhere, In, IsNull, Not, QueryRunner } from "typeorm";

import { ParamDto } from "../../../common/DTO/param.dto";
import { CategoryMessage, CommonMessage, ServiceMessage, SubscriptionMessage } from "../../../common/enums/message.enum";
import { SubscriptionStatus } from "../../subscriptions/enums/subscription-status.enum";
import { PaginationUtils } from "../../utils/providers/pagination.utils";
import { AddReviewDto } from "../DTO/add-review.dto";
import { CategoryListSearchQueryDto, CategorySearchQueryDto } from "../DTO/category-search-query.dto";
import { CreateDanakServiceCategoryDto } from "../DTO/create-category.dto";
import { CreateServiceDto } from "../DTO/create-service.dto";
import { DanakServiceReviewQueryDto } from "../DTO/danak-service-review-query.dto";
import { DanakServicesGlobalSearchDto, DanakServicesQueryDto, DanakServicesSearchQueryDto } from "../DTO/danak-services-search-query.dto";
import { UpdateDanakServiceCategoryDto } from "../DTO/update-category.dto";
import { UpdateReviewStatusDto } from "../DTO/update-review-status.dto";
import { UpdateServiceDto } from "../DTO/update-service.dto";
import { DanakServiceCategory } from "../entities/danak-service-category.entity";
import { DanakServiceImage } from "../entities/danak-service-image.entity";
import { ReviewStatus } from "../enums/review-status.enum";
import { DanakServicesCategoryRepository } from "../repositories/danak-services-category.repository";
import { DanakServicesImageRepository } from "../repositories/danak-services-image.repository";
import { DanakServiceReviewRepository } from "../repositories/danak-services-review.repository";
import { DanakServicesRepository } from "../repositories/danak-services.repository";

@Injectable()
export class DanakServicesService {
  private readonly logger = new Logger(DanakServicesService.name);
  constructor(
    private readonly danakServicesRepository: DanakServicesRepository,
    private readonly danakServicesCategoryRepository: DanakServicesCategoryRepository,
    private readonly danakServiceReviewRepository: DanakServiceReviewRepository,
    private readonly danakServicesImageRepository: DanakServicesImageRepository,
    private readonly dataSource: DataSource,
  ) {}
  /******************************************** */

  async createCategory(createDto: CreateDanakServiceCategoryDto) {
    const queryRunner = this.dataSource.createQueryRunner();
    await queryRunner.connect();
    await queryRunner.startTransaction();

    try {
      const existCategory = await queryRunner.manager.findOne(this.danakServicesCategoryRepository.target, {
        where: { title: createDto.title },
      });

      if (existCategory) {
        throw new BadRequestException(CategoryMessage.TITLE_EXIST);
      }

      const category = queryRunner.manager.create(this.danakServicesCategoryRepository.target, createDto);
      await queryRunner.manager.save(this.danakServicesCategoryRepository.target, category);

      await this.handleOrderCollision(queryRunner, category);

      await queryRunner.commitTransaction();
      return {
        message: CommonMessage.CREATED,
        category,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      this.logger.error("Error in create category", error);
      throw new BadRequestException(CategoryMessage.CREATION_FAILED);
    } finally {
      await queryRunner.release();
    }
  }
  //*********************************** */
  private async handleOrderCollision(queryRunner: QueryRunner, newCategory: DanakServiceCategory): Promise<void> {
    const conflictingCategory = await queryRunner.manager.findOne(this.danakServicesCategoryRepository.target, {
      where: {
        order: newCategory.order,
        id: Not(newCategory.id),
        deletedAt: IsNull(),
      },
    });

    if (conflictingCategory) {
      const highestOrderCategory = await queryRunner.manager.findOne(this.danakServicesCategoryRepository.target, {
        order: { order: "DESC" },
        where: { deletedAt: IsNull() },
      });

      const newOrder = highestOrderCategory ? highestOrderCategory.order + 1 : newCategory.order + 1;
      await queryRunner.manager.update(this.danakServicesCategoryRepository.target, conflictingCategory.id, { order: newOrder });
    }
  }
  /******************************************** */

  async getCategoryById(categoryId: string) {
    const category = await this.danakServicesCategoryRepository.findOneById(categoryId);
    if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST);
    return {
      category,
    };
  }

  /******************************************** */

  async updateCategory(categoryId: string, updateDto: UpdateDanakServiceCategoryDto) {
    const queryRunner = this.dataSource.createQueryRunner();
    await queryRunner.connect();
    await queryRunner.startTransaction();

    try {
      const category = await queryRunner.manager.findOne(DanakServiceCategory, { where: { id: categoryId } });
      if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST);

      if (updateDto.title) {
        const existCategory = await queryRunner.manager.findOne(DanakServiceCategory, {
          where: { title: updateDto.title, id: Not(categoryId) },
        });
        if (existCategory) throw new BadRequestException(CategoryMessage.TITLE_EXIST);
      }

      await queryRunner.manager.update(DanakServiceCategory, categoryId, updateDto);

      if (updateDto.order !== undefined && updateDto.order !== category.order) {
        await this.handleOrderCollision(queryRunner, { ...category, ...updateDto });
      }

      await queryRunner.commitTransaction();
      return {
        message: CommonMessage.UPDATE_SUCCESS,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      this.logger.error("Error in update category", error);
      throw new BadRequestException(CategoryMessage.UPDATE_FAILED);
    } finally {
      await queryRunner.release();
    }
  }

  /******************************************** */

  async deleteCategoryById(categoryId: string) {
    const category = await this.danakServicesCategoryRepository.findOneById(categoryId);
    if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST);
    //
    await this.danakServicesCategoryRepository.softDelete(categoryId);
    return {
      message: CommonMessage.DELETED,
    };
  }
  /******************************************** */
  async getCategories(queryDto: CategorySearchQueryDto) {
    const where: FindOptionsWhere<DanakServiceCategory> = {
      isActive: true,
      deletedAt: IsNull(),
    };

    if (queryDto.parentId === undefined) {
      where.parentId = IsNull();
    } else {
      // If parentId is provided, use it
      where.parentId = queryDto.parentId;
    }

    const categories = await this.danakServicesCategoryRepository.find({
      where,
      order: { createdAt: "ASC" },
    });

    return { categories };
  }

  /******************************************** */
  async getCategoryList(queryDto: CategoryListSearchQueryDto) {
    const { limit, skip } = PaginationUtils(queryDto);
    const queryBuilder = this.danakServicesCategoryRepository
      .createQueryBuilder("category")
      .where("category.deletedAt IS NULL")
      .loadRelationCountAndMap("category.servicesCount", "category.danakServices")
      .loadRelationCountAndMap("category.childrenCount", "category.children");

    if (queryDto.isActive !== undefined) {
      queryBuilder.andWhere("category.isActive = :isActive", { isActive: queryDto.isActive === 1 });
    }

    if (queryDto.q) {
      queryBuilder.andWhere("category.title ILIKE :q", { q: `%${queryDto.q}%` });
    }

    queryBuilder
      .leftJoinAndSelect("category.parent", "parent")
      .select(["category", "parent.id", "parent.title"])
      .orderBy("category.createdAt", "DESC");

    const [categories, count] = await queryBuilder.skip(skip).take(limit).getManyAndCount();

    return { categories, count, paginate: true };
  }
  /******************************************** */

  async getCategoriesUserSide() {
    const categories = await this.danakServicesCategoryRepository.find({
      where: { isActive: true, deletedAt: IsNull() },
      order: { order: "ASC" },
    });
    return {
      categories,
    };
  }
  /******************************************** */

  async getCategoryServices(categoryId?: string) {
    const category = await this.danakServicesCategoryRepository.findOne({
      where: { id: categoryId, isActive: true, deletedAt: IsNull(), danakServices: { isActive: true } },
      relations: {
        danakServices: true,
      },
      order: { createdAt: "DESC" },
    });
    if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST_OR_HAS_NO_SERVICE);
    return {
      category,
    };
  }

  /******************************************** */

  async toggleCategoryStatus(paramDto: ParamDto) {
    const category = await this.danakServicesCategoryRepository.findOneById(paramDto.id);
    if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST);
    //
    category.isActive = !category.isActive;
    //
    await this.danakServicesCategoryRepository.save(category);
    //
    return {
      message: CommonMessage.UPDATE_SUCCESS,
      isActive: category.isActive,
    };
  }
  /******************************************** */

  async toggleServiceStatus(paramDto: ParamDto) {
    const service = await this.danakServicesRepository.findServiceById(paramDto.id);
    if (!service) throw new BadRequestException(ServiceMessage.SERVICE_NOT_EXIST);
    //
    service.isActive = !service.isActive;
    //
    await this.danakServicesRepository.save(service);
    //
    return {
      message: CommonMessage.UPDATE_SUCCESS,
      isActive: service.isActive,
    };
  }
  /******************************************** */
  async toggleServiceSlider(paramDto: ParamDto) {
    const service = await this.danakServicesRepository.findServiceById(paramDto.id);
    if (!service) throw new BadRequestException(ServiceMessage.SERVICE_NOT_EXIST);
    //
    service.showInSlider = !service.showInSlider;
    //
    await this.danakServicesRepository.save(service);
    //
    return {
      message: CommonMessage.UPDATE_SUCCESS,
      showInSlider: service.showInSlider,
    };
  }
  /******************************************** */
  async createService(createDto: CreateServiceDto) {
    const category = await this.danakServicesCategoryRepository.findOneById(createDto.categoryId);
    if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST);

    const existService = await this.danakServicesRepository.findOneByName(createDto.name);
    if (existService) throw new BadRequestException(ServiceMessage.NAME_EXIST);

    const images = createDto.images.map((image) => {
      return { imageUrl: image };
    });

    const service = this.danakServicesRepository.create({ ...createDto, category, images });
    await this.danakServicesRepository.save(service);
    return {
      message: CommonMessage.CREATED,
      service,
    };
  }
  /******************************************** */
  async updateDanakService(serviceId: string, updateDto: UpdateServiceDto) {
    const service = await this.findServiceById(serviceId);

    let images: DanakServiceImage[] = [];

    if (updateDto.categoryId) {
      const category = await this.danakServicesCategoryRepository.findOneById(updateDto.categoryId);
      if (!category) throw new BadRequestException(CategoryMessage.CATEGORY_NOT_EXIST);
      service.category = category;
    }
    //
    if (updateDto.name) {
      const existService = await this.danakServicesRepository.findOneByName(updateDto.name, serviceId);
      if (existService) throw new BadRequestException(ServiceMessage.NAME_EXIST);
    }
    //
    if (updateDto.images) {
      await this.danakServicesImageRepository.delete({ danakService: { id: serviceId } });

      const newImages = updateDto.images.map((image) => {
        return this.danakServicesImageRepository.create({
          imageUrl: image,
          danakService: service,
        });
      });

      await this.danakServicesImageRepository.save(newImages);

      images = newImages;
    }

    await this.danakServicesRepository.save({ ...service, ...updateDto, images: images.length ? images : service.images });
    return {
      message: CommonMessage.UPDATE_SUCCESS,
      service,
    };
  }
  /******************************************** */

  async deleteServiceById(serviceId: string) {
    await this.findServiceById(serviceId);
    await this.danakServicesRepository.softDelete(serviceId);
    return {
      message: CommonMessage.DELETED,
    };
  }
  /******************************************** */

  async getServicesList(queryDto: DanakServicesSearchQueryDto) {
    return this.danakServicesRepository.getServicesForAdmin(queryDto);
  }
  /******************************************** */

  async getServicesListForUser(queryDto: DanakServicesQueryDto) {
    return this.danakServicesRepository.getServicesForUser(queryDto);
  }
  /******************************************** */

  async searchServices(queryDto: DanakServicesGlobalSearchDto) {
    const services = await this.danakServicesRepository.searchServices(queryDto);

    return {
      services,
    };
  }

  /******************************************** */

  async getDanakSuggestServices() {
    const danakServices = await this.danakServicesRepository.find({
      where: { isDanakSuggest: true, isActive: true, deletedAt: IsNull(), category: { isActive: true, deletedAt: IsNull() } },
      relations: { category: true },
      select: {
        id: true,
        name: true,
        title: true,
        description: true,
        createDate: true,
        icon: true,
        createdAt: true,
        isActive: true,
        isDanakSuggest: true,
        metaDescription: true,
        category: {
          id: true,
          title: true,
        },
      },
      order: { createdAt: "DESC" },
      withDeleted: false,
    });
    return {
      danakServices,
    };
  }
  /******************************************** */
  async getDanakServicesSlider() {
    const danakServices = await this.danakServicesRepository.find({
      where: { showInSlider: true, isActive: true, deletedAt: IsNull(), category: { isActive: true, deletedAt: IsNull() } },
      relations: { category: true, images: true },
      select: {
        id: true,
        name: true,
        title: true,
        description: true,
        createDate: true,
        icon: true,
        createdAt: true,
        isActive: true,
        isDanakSuggest: true,
        showInSlider: true,
        metaDescription: true,
        category: {
          id: true,
          title: true,
        },
        images: {
          id: true,
          imageUrl: true,
        },
      },
      order: { createdAt: "DESC" },
      withDeleted: false,
    });
    return { danakServices };
  }
  /******************************************** */

  async getDanakServiceByIdWithSubs(serviceId: string, isAdmin: boolean, userId: string) {
    const danakService = await this.danakServicesRepository.getDanakServiceById(serviceId, isAdmin);

    if (!danakService) throw new BadRequestException(ServiceMessage.SERVICE_NOT_FOUND_BY_ID);

    const averageRating = await this.danakServiceReviewRepository.getAverageRating(danakService.id);

    const hasSubscription = await this.checkUserPurchasedService(userId, serviceId);

    return {
      danakService,
      averageRating,
      purchased: !!hasSubscription,
    };
  }
  /******************************************** */

  async getDanakServiceByIdPublic(serviceId: string) {
    const danakService = await this.danakServicesRepository.getDanakServiceById(serviceId, false);
    if (!danakService) throw new BadRequestException(ServiceMessage.SERVICE_NOT_FOUND_BY_ID);
    const averageRating = await this.danakServiceReviewRepository.getAverageRating(danakService.id);

    return { danakService, averageRating };
  }
  /******************************************** */

  async getServiceUsers(serviceId: string) {
    await this.findServiceById(serviceId);

    const users = await this.danakServicesRepository.getUsersByService(serviceId);

    return { users };
  }

  /******************************************** */

  async getDanakServiceReviews(queryDto: DanakServiceReviewQueryDto) {
    const [reviews, count] = await this.danakServiceReviewRepository.getDanakServiceReviews(queryDto);

    return {
      reviews,
      count,
      paginate: true,
    };
  }

  /******************************************** */

  async getServiceByName(name: string) {
    const danakService = await this.danakServicesRepository.findOneByName(name);
    if (!danakService) throw new BadRequestException(ServiceMessage.SERVICE_NOT_EXIST);
    return danakService;
  }

  /******************************************** */

  async findServiceById(id: string) {
    const service = await this.danakServicesRepository.findOne({ where: { id, deletedAt: IsNull() }, relations: { images: true } });
    if (!service) throw new BadRequestException(ServiceMessage.SERVICE_NOT_EXIST);
    return service;
  }

  /******************************************** */

  async findServicesByIds(ids: string[]) {
    const services = await this.danakServicesRepository.findBy({ id: In(ids), deletedAt: IsNull() });
    return services;
  }

  /******************************************** */

  async addReview(userId: string, serviceId: string, addReviewDto: AddReviewDto) {
    const service = await this.findServiceById(serviceId);

    const hasSubscription = await this.checkUserPurchasedService(userId, serviceId);
    if (!hasSubscription) throw new BadRequestException(SubscriptionMessage.NOT_PURCHASED_CANNOT_REVIEW);

    // // Check if user already reviewed this service
    // const existingReview = await this.danakServiceReviewRepository.findOne({
    //   where: { user: { id: userId }, service: { id: serviceId } },
    // });

    // if (existingReview) {
    //   throw new BadRequestException(ServiceMessage.ALREADY_REVIEWED);
    // }

    const review = this.danakServiceReviewRepository.create({ user: { id: userId }, ...addReviewDto, service });
    await this.danakServiceReviewRepository.save(review);
    return {
      message: ServiceMessage.REVIEW_ADDED,
      review,
    };
  }

  /******************************************** */

  async updateDanakServiceReviewStatus(updateParamDto: UpdateReviewStatusDto) {
    if (updateParamDto.status === ReviewStatus.APPROVED) {
      return await this.approveReview(updateParamDto.id);
    } else {
      return await this.rejectReview(updateParamDto.id);
    }
  }

  async approveReview(reviewId: string) {
    const review = await this.danakServiceReviewRepository.findOneBy({ id: reviewId });
    if (!review) throw new BadRequestException(ServiceMessage.REVIEW_NOT_EXIST);

    review.status = ReviewStatus.APPROVED;

    await this.danakServiceReviewRepository.save(review);

    return {
      message: ServiceMessage.REVIEW_APPROVED,
      review,
    };
  }
  /******************************************** */

  async rejectReview(reviewId: string) {
    const review = await this.danakServiceReviewRepository.findOneBy({ id: reviewId });
    if (!review) throw new BadRequestException(ServiceMessage.REVIEW_NOT_EXIST);

    review.status = ReviewStatus.REJECTED;

    await this.danakServiceReviewRepository.save(review);

    return {
      message: ServiceMessage.REVIEW_REJECTED,
      review,
    };
  }

  /******************************************** */

  async getServicesCount() {
    const count = await this.danakServicesRepository.count({
      where: {
        isActive: true,
        deletedAt: IsNull(),
      },
    });

    return count;
  }
  /******************************************** */

  private async checkUserPurchasedService(userId: string, serviceId: string) {
    const subscription = await this.danakServicesRepository
      .createQueryBuilder()
      .select("1")
      .from("user_subscription", "us")
      .innerJoin("subscription_plan", "sp", "us.planId = sp.id")
      .where("us.userId = :userId", { userId })
      .andWhere("sp.serviceId = :serviceId", { serviceId })
      .andWhere(`(us.status = '${SubscriptionStatus.ACTIVE}')`)
      .andWhere("us.endDate > NOW()")
      .andWhere("us.startDate < NOW()")
      .limit(1)
      .getRawOne();

    return !!subscription;
  }
}