import { BadRequestException, Injectable, Logger } from '@nestjs/common';
import { FindOptionsWhere } from 'typeorm';
import { Transactional } from 'typeorm-transactional';
import { Roles } from '~/auth/enums';
import { PageOptionsRequestDto } from '~/core/dtos';
import { CustomerService } from '~/customer/services';
import { DocumentService, OciService } from '~/document/services';
import { User } from '~/user/entities';
import { UserType } from '~/user/enums';
import { UserService } from '~/user/services';
import { UserTokenService } from '~/user/services/user-token.service';
import { CreateJuniorRequestDto, SetThemeRequestDto } from '../dtos/request';
import { Junior } from '../entities';
import { JuniorRepository } from '../repositories';
import { QrcodeService } from './qrcode.service';

@Injectable()
export class JuniorService {
  private readonly logger = new Logger(JuniorService.name);
  constructor(
    private readonly juniorRepository: JuniorRepository,
    private readonly userService: UserService,
    private readonly userTokenService: UserTokenService,
    private readonly customerService: CustomerService,
    private readonly documentService: DocumentService,
    private readonly ociService: OciService,
    private readonly qrCodeService: QrcodeService,
  ) {}

  @Transactional()
  async createJuniors(body: CreateJuniorRequestDto, guardianId: string) {
    this.logger.log(`Creating junior for guardian ${guardianId}`);

    const searchConditions: FindOptionsWhere<User>[] = [{ email: body.email }];

    if (body.phoneNumber && body.countryCode) {
      searchConditions.push({
        phoneNumber: body.phoneNumber,
        countryCode: body.countryCode,
      });
    }

    const existingUser = await this.userService.findUser(searchConditions);

    if (existingUser) {
      this.logger.error(`User with email ${body.email} or phone number ${body.phoneNumber} already exists`);
      throw new BadRequestException('USER.ALREADY_EXISTS');
    }

    const user = await this.userService.createUser({
      email: body.email,
      countryCode: body.countryCode,
      phoneNumber: body.phoneNumber,
      roles: [Roles.JUNIOR],
    });

    const customer = await this.customerService.createJuniorCustomer(guardianId, user.id, body);

    await this.juniorRepository.createJunior(user.id, {
      guardianId,
      relationship: body.relationship,
      customerId: customer.id,
    });

    this.logger.log(`Junior ${user.id} created successfully`);

    return this.generateToken(user.id);
  }

  async findJuniorById(juniorId: string, withGuardianRelation = false, guardianId?: string) {
    this.logger.log(`Finding junior ${juniorId}`);
    const junior = await this.juniorRepository.findJuniorById(juniorId, withGuardianRelation, guardianId);

    if (!junior) {
      this.logger.error(`Junior ${juniorId} not found`);
      throw new BadRequestException('JUNIOR.NOT_FOUND');
    }

    this.logger.log(`Junior ${juniorId} found successfully`);
    return junior;
  }

  @Transactional()
  async setTheme(body: SetThemeRequestDto, juniorId: string) {
    this.logger.log(`Setting theme for junior ${juniorId}`);
    const document = await this.documentService.findDocumentById(body.avatarId);
    if (!document || document.createdById !== juniorId) {
      this.logger.error(`Document ${body.avatarId} not found or not created by junior ${juniorId}`);
      throw new BadRequestException('DOCUMENT.NOT_FOUND');
    }
    const junior = await this.findJuniorById(juniorId);
    if (junior.theme) {
      this.logger.log(`Removing existing theme for junior ${juniorId}`);
      await this.juniorRepository.removeTheme(junior.theme);
    }

    await this.juniorRepository.setTheme(body, junior);
    this.logger.log(`Theme set for junior ${juniorId}`);
    return this.juniorRepository.findThemeForJunior(juniorId);
  }

  async findJuniorsByGuardianId(guardianId: string, pageOptions: PageOptionsRequestDto): Promise<[Junior[], number]> {
    this.logger.log(`Finding juniors for guardian ${guardianId}`);
    const [juniors, itemCount] = await this.juniorRepository.findJuniorsByGuardianId(guardianId, pageOptions);
    this.logger.log(`Juniors found for guardian ${guardianId}`);
    await this.prepareJuniorImages(juniors);
    return [juniors, itemCount];
  }

  async validateToken(token: string) {
    this.logger.log(`Validating token ${token}`);
    const juniorId = await this.userTokenService.validateToken(token, UserType.JUNIOR);
    return this.findJuniorById(juniorId!, true);
  }

  async generateToken(juniorId: string) {
    this.logger.log(`Generating token for junior ${juniorId}`);

    const token = await this.userTokenService.generateToken(juniorId);

    return this.qrCodeService.generateQrCode(token);
  }

  async doesJuniorBelongToGuardian(guardianId: string, juniorId: string) {
    this.logger.log(`Checking if junior ${juniorId} belongs to guardian ${guardianId}`);
    const junior = await this.findJuniorById(juniorId, false, guardianId);

    return !!junior;
  }

  private async prepareJuniorImages(juniors: Junior[]) {
    this.logger.log(`Preparing junior images`);
    await Promise.all(
      juniors.map(async (junior) => {
        const profilePicture = junior.customer.profilePicture;

        if (profilePicture) {
          profilePicture.url = await this.ociService.generatePreSignedUrl(profilePicture);
        }
      }),
    );
  }
}