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

import { ReferralService } from "./referral.service";
import { ParamDto } from "../../../common/DTO/param.dto";
import { CommonMessage, TicketMessageEnum, UserMessage } from "../../../common/enums/message.enum";
import { DanakService } from "../../danak-services/entities/danak-service.entity";
import { NotificationQueue } from "../../notifications/queue/notification.queue";
import { SupportPlanFeatureKey } from "../../support-plans/enums/support-plan-feature-key.enum";
import { SupportPlansService } from "../../support-plans/providers/support-plans.service";
import { User } from "../../users/entities/user.entity";
import { AdminsService } from "../../users/providers/admins.service";
import { UsersService } from "../../users/providers/users.service";
import { CreateTicketCategoryDto } from "../DTO/create-ticket-category.dto";
import { CreateTicketMessageDto } from "../DTO/create-ticket-message.dto";
import { CreateTicketDto } from "../DTO/create-ticket.dto";
import { ReferTicketDto } from "../DTO/refer-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 { TicketCategory } from "../entities/ticket-category.entity";
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 {
  private readonly logger = new Logger(TicketsService.name);

  constructor(
    private readonly ticketsRepository: TicketsRepository,
    private readonly ticketsCategoryRepository: TicketCategoryRepository,
    private readonly ticketMessagesRepository: TicketMessagesRepository,
    private readonly usersService: UsersService,
    private readonly adminsService: AdminsService,
    private readonly notificationQueue: NotificationQueue,
    private readonly referralService: ReferralService,
    private readonly dataSource: DataSource,
    private readonly supportPlansService: SupportPlansService,
  ) {}

  //******************************** */
  async getTicketCategories() {
    const ticketCategories = await this.ticketsCategoryRepository.find({});
    return {
      ticketCategories,
    };
  }
  //******************************** */

  async getCategoriesList(queryDto: SearchTicketCategoryDto) {
    const [categories, count] = await this.ticketsCategoryRepository.findCategoriesList(queryDto);

    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,
    };
  }

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

  private async checkTicketLimit(userId: string, queryRunner: QueryRunner): Promise<void> {
    const { userSupportPlan } = await this.supportPlansService.getUserSupportPlanOfUser(userId);

    if (!userSupportPlan) throw new BadRequestException(TicketMessageEnum.NO_ACTIVE_SUPPORT_PLAN);

    const ticketLimitFeature = userSupportPlan.supportPlan.features.find(
      (feature) => feature.featureKey === SupportPlanFeatureKey.TICKET_LIMIT,
    );

    if (!ticketLimitFeature) throw new BadRequestException(TicketMessageEnum.TICKET_LIMIT_NOT_FOUND);

    const ticketLimit = parseInt(ticketLimitFeature.featureValue);
    if (isNaN(ticketLimit)) return;

    const today = dayjs().startOf("day").toDate();

    const ticketCount = await queryRunner.manager.count(this.ticketsRepository.target, {
      where: {
        user: { id: userId },
        createdAt: MoreThanOrEqual(today),
      },
    });

    if (ticketCount >= ticketLimit) throw new BadRequestException(TicketMessageEnum.TICKET_LIMIT_EXCEEDED);
  }

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

  async createTicket(createDto: CreateTicketDto, userId: string) {
    const queryRunner = this.dataSource.createQueryRunner();
    await queryRunner.connect();
    await queryRunner.startTransaction();

    try {
      const [user, ticketCategory] = await Promise.all([
        this.usersService.findOneByIdWithQueryRunner(userId, queryRunner),
        queryRunner.manager.findOne(TicketCategory, {
          where: { id: createDto.categoryId },
          relations: { group: { users: true } },
        }),
      ]);

      if (!ticketCategory) throw new BadRequestException(TicketMessageEnum.CATEGORY_NOT_FOUND);

      await this.checkTicketLimit(userId, queryRunner);

      let service = null;
      if (createDto.danakServiceId) {
        service = await queryRunner.manager.findOneBy(DanakService, {
          id: createDto.danakServiceId,
        });
        if (!service) throw new BadRequestException(TicketMessageEnum.SERVICE_NOT_FOUND);
      }

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

      if (createDto.attachmentUrls?.length) {
        ticketMessage.attachments = createDto.attachmentUrls.map((url) => {
          const attachment = new TicketMessageAttachment();
          attachment.attachmentUrl = url;
          return attachment;
        });
      }

      const ticket = queryRunner.manager.create(Ticket, {
        ...createDto,
        user,
        category: ticketCategory,
        messages: [ticketMessage],
        danakService: service,
      });

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

      await this.assignTicketAndNotify(ticket, ticketCategory, user, queryRunner);

      await queryRunner.commitTransaction();

      return {
        message: TicketMessageEnum.CREATED,
        ticketId: ticket.id,
      };
    } catch (error) {
      this.logger.error("Error in create ticket transaction", error);
      await queryRunner.rollbackTransaction();
      throw error;
    } finally {
      await queryRunner.release();
    }
  }

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

  async getTickets(queryDto: SearchTicketQueryDto, userId: string) {
    const [tickets, count] = await this.ticketsRepository.findTicketsList(queryDto, userId);

    return { tickets, count, paginate: true };
  }
  //******************************** */
  async getTicketForAdmin(queryDto: SearchTicketQueryDto, adminId: string) {
    const isSuperAdmin = await this.usersService.isSuperAdmin(adminId);

    const [tickets, count] = await this.ticketsRepository.findTicketsListForAdmin(queryDto, adminId, isSuperAdmin);

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

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

  async createTicketMessage(ticketId: string, createDto: CreateTicketMessageDto, userId: string, isAdmin: boolean) {
    const queryRunner = this.dataSource.createQueryRunner();
    await queryRunner.connect();
    await queryRunner.startTransaction();

    try {
      const ticket = await this.findTicket(queryRunner, ticketId, userId, isAdmin);
      if (ticket.status === TicketStatus.CLOSED) throw new BadRequestException(TicketMessageEnum.TICKET_CLOSED);

      const isSuperAdmin = await this.usersService.isSuperAdmin(userId);
      if (isAdmin && !isSuperAdmin && ticket.assignedTo?.id !== userId)
        throw new BadRequestException(TicketMessageEnum.TICKET_NOT_ASSIGNED_TO_USER);

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

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

      if (createDto.attachmentUrls?.length) {
        await this.saveAttachments(queryRunner, createDto.attachmentUrls, ticketMessage);
      }

      this.updateTicketStatus(ticket, isAdmin);
      await queryRunner.manager.save(Ticket, ticket);

      if (isAdmin) {
        await this.sendNotificationForAdminResponse(ticket, user);
      }

      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, isAdmin: boolean) {
    let ticket: null | Ticket = null;
    //
    if (isAdmin) {
      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, isAdmin: boolean) {
    let ticket: null | Ticket = null;

    if (isAdmin) {
      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 referTicket(ticketId: string, userId: string, referDto: ReferTicketDto) {
    const queryRunner = this.dataSource.createQueryRunner();

    try {
      await queryRunner.connect();
      await queryRunner.startTransaction();

      const isSuperAdmin = await this.usersService.isSuperAdmin(userId);
      // if (!isSuperAdmin) throw new BadRequestException(TicketMessageEnum.TICKET_NOT_ASSIGNED_TO_USER);
      console.log("isSuperAdmin", isSuperAdmin);

      const ticket = await this.ticketsRepository.findTicketById(ticketId);
      if (!ticket) throw new BadRequestException(TicketMessageEnum.TICKET_NOT_FOUND);

      const admin = await this.usersService.findOneByIdWithQueryRunner(referDto.adminId, queryRunner);

      ticket.assignedTo = admin;
      await queryRunner.manager.save(this.ticketsRepository.target, ticket);

      await this.notificationQueue.addAssignTicketNotificationForAdmin(admin.id, {
        ticketId: ticket.numericId.toString(),
        subject: ticket.subject,
        date: ticket.createdAt,
        userPhone: admin.phone,
        userEmail: admin.email,
        user: `${ticket.user.firstName} ${ticket.user.lastName}`,
      });

      await queryRunner.commitTransaction();
      return {
        message: TicketMessageEnum.REFERRED,
        ticket,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      throw error;
    } finally {
      await queryRunner.release();
    }
  }

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

  async getUnreadTickets() {
    const unreadTickets = await this.ticketsRepository.count({
      where: { status: TicketStatus.PENDING },
    });
    return unreadTickets;
  }

  //******************************** */
  async countUserTickets(userId: string) {
    const ticketCount = await this.ticketsRepository.count({
      where: { user: { id: userId }, status: Not(TicketStatus.CLOSED) },
    });
    return ticketCount;
  }

  //***************************** */
  private async assignTicketAndNotify(ticket: Ticket, ticketCategory: TicketCategory, user: User, queryRunner: QueryRunner) {
    const assignedUser = await this.referralService.assignAdmin(ticketCategory.group);
    //
    ticket.assignedTo = assignedUser;
    await queryRunner.manager.save(Ticket, ticket);

    await this.notificationQueue.addAssignTicketNotificationForAdmin(assignedUser.id, {
      ticketId: ticket.numericId.toString(),
      subject: ticket.subject,
      date: ticket.createdAt,
      userPhone: user.phone,
      userEmail: user.email,
      user: `${user.firstName} ${user.lastName}`,
    });

    await this.notificationQueue.addTicketNotification(user.id, {
      ticketId: ticket.numericId.toString(),
      subject: ticket.subject,
      date: ticket.createdAt,
      userPhone: user.phone,
      userEmail: user.email,
    });
    await this.notifySuperAdminsForTicket(queryRunner, ticket);
  }
  //***************************** */

  private async findTicket(queryRunner: QueryRunner, ticketId: string, userId: string, isAdmin: boolean): Promise<Ticket> {
    const ticket = isAdmin
      ? await queryRunner.manager.findOne(Ticket, {
          where: { id: ticketId },
          relations: { user: true, assignedTo: true },
        })
      : await queryRunner.manager.findOne(Ticket, {
          where: { id: ticketId, user: { id: userId } },
          relations: { user: true, assignedTo: true },
        });

    if (!ticket) throw new BadRequestException(TicketMessageEnum.TICKET_NOT_FOUND);
    return ticket;
  }
  //***************************** */

  private updateTicketStatus(ticket: Ticket, isAdmin: boolean): void {
    if (isAdmin && ticket.status === TicketStatus.PENDING) {
      ticket.status = TicketStatus.ANSWERED;
    } else if (!isAdmin && ticket.status === TicketStatus.ANSWERED) {
      ticket.status = TicketStatus.PENDING;
    }
  }
  //***************************** */

  private async saveAttachments(queryRunner: QueryRunner, attachmentUrls: string[], ticketMessage: TicketMessage) {
    const attachments = attachmentUrls.map((url) =>
      queryRunner.manager.create(TicketMessageAttachment, {
        attachmentUrl: url,
        ticketMessage,
      }),
    );
    await queryRunner.manager.save(TicketMessageAttachment, attachments);
  }
  //***************************** */

  private async sendNotificationForAdminResponse(ticket: Ticket, admin: User) {
    await this.notificationQueue.addAnswerTicketNotification(ticket.user.id, {
      ticketId: ticket.numericId.toString(),
      subject: ticket.subject,
      date: ticket.createdAt,
      userPhone: admin.phone,
      userEmail: admin.email,
    });
  }
  //***************************** */

  private async notifySuperAdminsForTicket(queryRunner: QueryRunner, ticket: Ticket) {
    const superAdmins = await this.adminsService.getSuperAdmins(queryRunner);

    for (const admin of superAdmins) {
      await this.notificationQueue.addNewTicketGlobalNotification(admin.id, {
        ticketId: ticket.numericId.toString(),
        ticketSubject: ticket.subject,
        userPhone: admin.phone,
        userEmail: admin.email,
        fullName: `${ticket.user.firstName} ${ticket.user.lastName}`,
      });
    }
  }
}