import { ConflictException, Inject, Injectable } from '@nestjs/common'
import { securityConfig, SecurityConfig } from 'src/common/configs'
import { MailerService } from '@nestjs-modules/mailer'
import { JwtService } from '@nestjs/jwt'
import { EmailScene } from './dto/email.dto'
import { PrismaService } from 'nestjs-prisma'

@Injectable()
export class EmailService {
  constructor(
    private prismaService: PrismaService,
    private mailerService: MailerService,
    private jwtService: JwtService,
    @Inject(securityConfig.KEY)
    private secureConfig: SecurityConfig,
  ) {}

  async sendEmailTo(email: string) {
    return this.mailerService.sendMail({
      to: email, // list of receivers
      subject: 'Testing Nest Mailermodule with template ✔',
      template: 'index', // The `.pug` or `.hbs` extension is appended automatically.
      context: {
        // Data to be sent to template engine.
        code: 'cf1a3f828287',
        username: 'john doe',
      },
    })
  }

  async getRegisterToken(email: string, scene: EmailScene) {
    const user = await this.prismaService.user.findUnique({ where: { email } })
    if (user) {
      throw new ConflictException(`邮箱${email}已注册`)
    }
    const verificationCode = this.generateRandomNum()
    const registerToken = this.jwtService.sign(
      { email, scene },
      {
        secret: this.secureConfig.jwt_access_secret + verificationCode + scene,
        expiresIn: '30min',
      },
    )
    await this.mailerService.sendMail({
      to: email,
      subject: '注册qiuxu.site',
      html: `您正在注册qiuxu.site，验证码为 <strong>${verificationCode}</strong>，30分钟内有效`,
    })
    return { registerToken, verificationCode }
  }

  private generateRandomNum() {
    return Math.floor(Math.random() * 899999 + 100000)
  }
}