import { BadRequestException, HttpException, Injectable, InternalServerErrorException } from "@nestjs/common";
import { DataSource, Not } from "typeorm";

import { ParamDto } from "../../../common/DTO/param.dto";
import { CommonMessage, TicketMessageEnum, UserMessage } from "../../../common/enums/message.enum";
import { User } from "../../users/entities/user.entity";
import { RoleEnum } from "../../users/enums/role.enum";
import { UsersService } from "../../users/providers/users.service";
import { PaginationUtils } from "../../utils/providers/pagination.utils";
import { CreateTicketCategoryDto } from "../DTO/create-ticket-category.dto";
import { CreateTicketMessageDto } from "../DTO/create-ticket-message.dto";
import { CreateTicketDto } from "../DTO/create-ticket.dto";
import { SearchTicketCategoryDto } from "../DTO/search-ticket-category.dto";
import { SearchTicketQueryDto } from "../DTO/search-ticket-query.dto";
import { UpdateTicketCategoryDto } from "../DTO/update-ticket-category.dto";
import { TicketMessageAttachment } from "../entities/ticket-message-attachment";
import { TicketMessage } from "../entities/ticket-message.entity";
import { Ticket } from "../entities/ticket.entity";
import { TicketStatus } from "../enums/ticket-status.enum";
import { TicketCategoryRepository } from "../repositories/tickets-category.repository";
import { TicketMessagesRepository } from "../repositories/tickets-message.repository";
import { TicketsRepository } from "../repositories/tickets.repository";

@Injectable()
export class TicketsService {
  constructor(
    private readonly ticketsCategoryRepository: TicketCategoryRepository,
    private readonly ticketsRepository: TicketsRepository,
    private readonly ticketMessagesRepository: TicketMessagesRepository,
    private readonly usersService: UsersService,
    private dataSource: DataSource,
  ) {}
  //******************************** */
  async getTicketCategories() {
    const ticketCategories = await this.ticketsCategoryRepository.find({});
    return {
      ticketCategories,
    };
  }
  //******************************** */

  async getCategoriesList(queryDto: SearchTicketCategoryDto) {
    const { limit, skip } = PaginationUtils(queryDto);
    const queryBuilder = this.ticketsCategoryRepository
      .createQueryBuilder("category")
      //   .leftJoinAndSelect("category.group", "group")
      //   .addSelect(["group.id", "group.name"])
      .leftJoin("category.group", "group")
      .addSelect(["group.id", "group.name"])
      //   .leftJoinAndSelect("group.users", "users")
      .loadRelationCountAndMap("category.ticketsCount", "category.tickets")
      .loadRelationCountAndMap("category.usersCount", "group.users");

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

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

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

    return { categories, count, paginate: true };
  }
  //******************************** */
  async createTicketCategory(createDto: CreateTicketCategoryDto) {
    const { userGroup } = await this.usersService.getUserGroupById(createDto.userGroupId);
    const existCategory = await this.ticketsCategoryRepository.findCategoryByTitle(createDto.title);

    if (existCategory) throw new BadRequestException(TicketMessageEnum.CATEGORY_EXIST);
    const ticketCategory = this.ticketsCategoryRepository.create({ ...createDto, group: userGroup });
    await this.ticketsCategoryRepository.save(ticketCategory);

    return {
      message: TicketMessageEnum.CATEGORY_CREATED,
    };
  }

  //******************************** */
  async updateCategory(paramDto: ParamDto, updateCategoryDto: UpdateTicketCategoryDto) {
    const category = await this.ticketsCategoryRepository.findCategoryById(paramDto.id);
    if (!category) throw new BadRequestException(TicketMessageEnum.CATEGORY_NOT_FOUND);

    if (updateCategoryDto.title) {
      const { title } = updateCategoryDto;
      const existCategory = await this.ticketsCategoryRepository.findOneBy({ title, id: Not(paramDto.id) });
      if (existCategory) throw new BadRequestException(TicketMessageEnum.CATEGORY_EXIST);
    }
    await this.ticketsCategoryRepository.save({ ...category, ...updateCategoryDto });

    return {
      message: CommonMessage.UPDATE_SUCCESS,
    };
  }
  //******************************** */
  async toggleCategoryStatus(paramDto: ParamDto) {
    const category = await this.ticketsCategoryRepository.findCategoryById(paramDto.id);
    if (!category) throw new BadRequestException(TicketMessageEnum.CATEGORY_NOT_FOUND);
    category.isActive = !category.isActive;
    await this.ticketsCategoryRepository.save(category);
    return {
      message: CommonMessage.UPDATE_SUCCESS,
      isActive: category.isActive,
    };
  }

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

  async createTicket(createDto: CreateTicketDto, userId: string) {
    const { user } = await this.usersService.findOneById(userId);
    const ticketCategory = await this.ticketsCategoryRepository.findCategoryById(createDto.categoryId);
    if (!ticketCategory) throw new BadRequestException(TicketMessageEnum.CATEGORY_NOT_FOUND);
    const { attachmentUrls } = createDto;

    //

    const ticketMessage: Partial<TicketMessage> = { content: createDto.message, author: user };

    if (attachmentUrls) {
      ticketMessage.attachments = attachmentUrls.map((url) => {
        const attachment = new TicketMessageAttachment();
        attachment.attachmentUrl = url;
        return attachment;
      });
    }
    const ticket = this.ticketsRepository.create({ ...createDto, user, category: ticketCategory, messages: [ticketMessage] });

    await this.ticketsRepository.save(ticket);

    return {
      message: TicketMessageEnum.CREATED,
      ticketId: ticket.id,
    };
  }

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

  async getTickets(queryDto: SearchTicketQueryDto, userId: string) {
    const { limit, skip } = PaginationUtils(queryDto);

    const findOptions = {
      where: {
        user: { id: userId },
        ...(queryDto.status && { status: queryDto.status }),
      },
      relations: {
        category: true,
        // user: true,
      },
      order: {
        createdAt: "DESC" as const,
      },
      skip,
      take: limit,
    };

    const [tickets, count] = await this.ticketsRepository.findAndCount(findOptions);

    return { tickets, count, paginate: true };
  }
  //******************************** */
  //TODO: get for admin with group of category
  async getAllTickets(queryDto: SearchTicketQueryDto) {
    const { limit, skip } = PaginationUtils(queryDto);

    const findOptions = {
      where: {
        ...(queryDto.status && { status: queryDto.status }),
      },
      relations: ["category", "user"],
      order: { createdAt: "DESC" as const },
      skip,
      take: limit,
    };

    const [tickets, count] = await this.ticketsRepository.findAndCount(findOptions);

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

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

  async createTicketMessage(ticketId: string, createDto: CreateTicketMessageDto, userId: string, roles: RoleEnum[]) {
    const queryRunner = this.dataSource.createQueryRunner();
    await queryRunner.connect();
    await queryRunner.startTransaction();

    try {
      let ticket: null | Ticket = null;

      if (roles.includes(RoleEnum.ADMIN)) {
        ticket = await queryRunner.manager.findOneBy(Ticket, { id: ticketId });
      } else {
        ticket = await queryRunner.manager.findOneBy(Ticket, { id: ticketId, user: { id: userId } });
      }

      if (!ticket) throw new BadRequestException(TicketMessageEnum.TICKET_NOT_FOUND);

      if (ticket.status === TicketStatus.CLOSED) throw new BadRequestException(TicketMessageEnum.TICKET_CLOSED);

      const user = await queryRunner.manager.findOneBy(User, { id: userId });
      if (!user) throw new BadRequestException(UserMessage.USER_NOT_FOUND);

      const ticketMessage = queryRunner.manager.create(TicketMessage, { ...createDto, author: user, ticket });

      if (roles.includes(RoleEnum.ADMIN) && ticket.status === TicketStatus.PENDING) {
        ticket.status = TicketStatus.ANSWERED;
      }

      await queryRunner.manager.save(Ticket, ticket);
      await queryRunner.manager.save(TicketMessage, ticketMessage);

      if (createDto.attachmentUrls) {
        const attachments = createDto.attachmentUrls.map((url) =>
          queryRunner.manager.create(TicketMessageAttachment, { attachmentUrl: url, ticketMessage }),
        );
        await queryRunner.manager.save(TicketMessageAttachment, attachments);
      }

      await queryRunner.commitTransaction();
      return {
        message: TicketMessageEnum.MESSAGE_CREATED,
        ticketMessage,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      if (error instanceof HttpException) throw error;
      throw new InternalServerErrorException(TicketMessageEnum.ERROR_IN_TICKET_MSG_CREATION);
    } finally {
      await queryRunner.release();
    }
  }

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

  async getTicketMessages(ticketId: string, userId: string, roles: RoleEnum[]) {
    let ticket: null | Ticket = null;

    //
    if (roles.includes(RoleEnum.ADMIN)) {
      ticket = await this.ticketsRepository.findTicketById(ticketId);
    } else {
      ticket = await this.ticketsRepository.findTicketById(ticketId, userId);
    }
    if (!ticket) throw new BadRequestException(TicketMessageEnum.TICKET_NOT_FOUND);

    const messages = await this.ticketMessagesRepository.findMessagesByTicketId(ticketId);
    return {
      ticket,
      messages,
    };
  }

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

  async closeTicketByUser(ticketId: string, userId: string, roles: RoleEnum[]) {
    let ticket: null | Ticket = null;

    if (roles.includes(RoleEnum.ADMIN)) {
      ticket = await this.ticketsRepository.findTicketById(ticketId);
    } else {
      ticket = await this.ticketsRepository.findTicketById(ticketId, userId);
    }

    if (!ticket) throw new BadRequestException(TicketMessageEnum.TICKET_NOT_FOUND);

    ticket.status = TicketStatus.CLOSED;
    await this.ticketsRepository.save(ticket);

    return {
      message: TicketMessageEnum.CLOSED,
    };
  }

  //******************************** */
}

// async getTickets(queryDto: SearchTicketQueryDto, userId: string) {
//   const { limit, skip } = PaginationUtils(queryDto);
//   //TODO:add danak-service to query
//   const queryBuilder = this.ticketsRepository
//     .createQueryBuilder("ticket")
//     .leftJoinAndSelect("ticket.category", "category")
//     .leftJoinAndSelect("ticket.user", "user")
//     .where("user.id = :userId", { userId })
//     .orderBy("ticket.createdAt", "DESC");

//   if (queryDto.status) {
//     queryBuilder.andWhere("ticket.status = :status", { status: queryDto.status });
//   }

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

//   return {
//     tickets,
//     count,
//   };
// }