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

import { AdminMessage, AdsMessage, UserMessage } from "../../../common/enums/message.enum";
import { PaginationUtils } from "../../utils/providers/pagination.utils";
import { PasswordService } from "../../utils/providers/password.service";
import { CreateAdminDto } from "../DTO/create-admin.dto";
import { CreateRoleDto } from "../DTO/create-role.dto";
import { SearchAdminQueryDto } from "../DTO/search-admins-query.dto";
import { SearchRolesQueryDto } from "../DTO/search-roles.dto";
import { UpdateAdminDto } from "../DTO/update-admin.dto";
import { RoleEnum } from "../enums/role.enum";
import { PermissionsRepository } from "../repositories/permissions.repository";
import { RoleRepository } from "../repositories/roles.repository";
import { UserRepository } from "../repositories/users.repository";

@Injectable()
export class AdminsService {
  constructor(
    private readonly userRepository: UserRepository,
    private readonly rolesRepository: RoleRepository,
    private readonly permissionsRepository: PermissionsRepository,
    private readonly passwordService: PasswordService,
    private readonly dataSource: DataSource,
  ) {}

  async createAdmin(createDto: CreateAdminDto) {
    const queryRunner = this.dataSource.createQueryRunner();

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

      const existEmail = await queryRunner.manager.findOneBy(this.userRepository.target, { email: createDto.email });
      if (existEmail) throw new BadRequestException(UserMessage.EMAIL_EXIST);

      const existPhone = await queryRunner.manager.findOneBy(this.userRepository.target, { phone: createDto.phone });
      if (existPhone) throw new BadRequestException(UserMessage.PHONE_EXIST);

      const role = await queryRunner.manager.findOne(this.rolesRepository.target, {
        where: { id: createDto.roleId },
        relations: { permissions: true },
      });
      if (!role) throw new BadRequestException(AdsMessage.ROLE_NOT_FOUND);

      if (createDto.password !== createDto.repeatPassword) throw new BadRequestException(AdminMessage.PASSWORD_NOT_MATCH);

      const hashedPassword = await this.passwordService.hashPassword(createDto.password);
      const userName = slugify(`${createDto.firstName} ${Date.now().toString().slice(-5)}`, { lower: true, trim: true });

      await queryRunner.manager.save(this.rolesRepository.target, role);

      const adminUser = queryRunner.manager.create(this.userRepository.target, {
        ...createDto,
        roles: [role],
        password: hashedPassword,
        userName,
      });

      await queryRunner.manager.save(this.userRepository.target, adminUser);
      await queryRunner.commitTransaction();

      return {
        message: AdminMessage.ADMIN_CREATED,
        adminUser,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      throw error;
    } finally {
      await queryRunner.release();
    }
  }
  /************************************************************ */

  async updateAdmin(id: string, updateDto: UpdateAdminDto) {
    const queryRunner = this.dataSource.createQueryRunner();

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

      const admin = await queryRunner.manager.findOne(this.userRepository.target, {
        where: { id, roles: { isAdmin: true } },
        relations: { roles: true },
      });
      if (!admin) throw new BadRequestException(UserMessage.ADMIN_NOT_FOUND);

      if (updateDto.email && updateDto.email !== admin.email) {
        const existEmail = await queryRunner.manager.findOneBy(this.userRepository.target, { email: updateDto.email, id: Not(id) });
        if (existEmail) throw new BadRequestException(UserMessage.EMAIL_EXIST);
      }

      if (updateDto.phone && updateDto.phone !== admin.phone) {
        const existPhone = await queryRunner.manager.findOneBy(this.userRepository.target, { phone: updateDto.phone, id: Not(id) });
        if (existPhone) throw new BadRequestException(UserMessage.PHONE_EXIST);
      }

      if (updateDto.roleId) {
        const role = await queryRunner.manager.findOne(this.rolesRepository.target, {
          where: { id: updateDto.roleId },
          relations: { permissions: true },
        });
        if (!role) throw new BadRequestException(AdsMessage.ROLE_NOT_FOUND);

        await queryRunner.manager.save(this.rolesRepository.target, role);

        admin.roles = [role];

        await queryRunner.manager.save(this.userRepository.target, admin);
      }

      if (updateDto.password) {
        if (updateDto.password !== updateDto.repeatPassword) throw new BadRequestException(AdminMessage.PASSWORD_NOT_MATCH);

        admin.password = await this.passwordService.hashPassword(updateDto.password);
      }

      await queryRunner.manager.save(this.userRepository.target, { ...admin, ...updateDto, password: admin.password });

      await queryRunner.commitTransaction();

      return {
        message: AdminMessage.ADMIN_UPDATED,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      throw error;
    } finally {
      await queryRunner.release();
    }
  }
  /************************************************************ */

  async deleteAdmin(id: string) {
    const admin = await this.userRepository.findOne({ where: { id, roles: { isAdmin: true } } });
    if (!admin) throw new BadRequestException(AdminMessage.ADMIN_NOT_FOUND);

    await this.userRepository.softDelete(id);
    return {
      message: AdminMessage.ADMIN_DELETED,
    };
  }

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

  async createRole(createDto: CreateRoleDto) {
    const existRole = await this.rolesRepository.findOne({ where: { name: createDto.name } });
    if (existRole) throw new BadRequestException(AdminMessage.ROLE_EXIST);

    const permissions = await this.permissionsRepository.findBy({ id: In(createDto.permissions) });
    if (permissions.length !== createDto.permissions.length) throw new BadRequestException(AdminMessage.PERMISSIONS_NOT_FOUND);

    const role = this.rolesRepository.create({ ...createDto, permissions, isAdmin: true });
    await this.rolesRepository.save(role);
    return {
      message: AdminMessage.ROLE_CREATED,
      role,
    };
  }

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

  async getAdmins(queryDto: SearchAdminQueryDto) {
    const [users, count] = await this.userRepository.getAdmins(queryDto);

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

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

  async getAdminById(id: string) {
    const admin = await this.userRepository.findOne({ where: { id, roles: { isAdmin: true } }, relations: { roles: true } });
    if (!admin) throw new BadRequestException(AdminMessage.ADMIN_NOT_FOUND);
    return { admin };
  }
  /************************************************************ */

  async getPermissions() {
    const permissions = await this.permissionsRepository.find({ select: { id: true, name: true } });
    return {
      permissions,
    };
  }
  /************************************************************ */

  async getAdminPermissions(userId: string) {
    const user = await this.userRepository.findOne({ where: { id: userId }, relations: { roles: { permissions: true } } });
    if (!user) throw new BadRequestException(UserMessage.USER_NOT_FOUND);

    return {
      permissions: user.roles[0].permissions,
    };
  }
  /************************************************************ */

  async getRoles(queryDto: SearchRolesQueryDto) {
    const { limit, skip } = PaginationUtils(queryDto);
    const queryBuilder = this.rolesRepository.createQueryBuilder("role");

    queryBuilder
      .where("role.isAdmin = :isAdmin", { isAdmin: true })
      //   .leftJoinAndSelect("role.permissions", "permissions")
      .loadRelationCountAndMap("role.userCount", "role.users");

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

    queryBuilder.take(limit).skip(skip).orderBy("role.createdAt", "DESC");

    const [roles, count] = await queryBuilder.getManyAndCount();

    return {
      roles,
      count,
      paginate: true,
    };
  }
  /************************************************************ */
  async getSuperAdmins() {
    return this.userRepository.find({ where: { roles: { isAdmin: true, name: RoleEnum.SUPER_ADMIN } } });
  }
}