import * as moment from 'moment';
import { Injectable } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { UserEntity } from 'src/users/entities/users.entity';
import { ConfigService } from '@nestjs/config';
import { PinoLogger } from 'nestjs-pino';

@Injectable()
export class AuthAccessService {
  constructor(
    private jwts: JwtService,
    private config: ConfigService,
    private logger: PinoLogger,
  ) { }

  async generate(user: UserEntity) {
    const now = new Date();
    const limit = parseInt(this.config.getOrThrow<string>('AUTH_JWT_ACCESS_TOKEN_EXPIRATION_MS'));
    const expiration = moment(now).add(limit, 'ms').toDate();

    const token = await this.jwts.signAsync(
      {
        username: user.userLogin,
        sub: user.userId,
        iat: Math.floor(now.getTime() / 1000),
        nbf: Math.floor(now.getTime() / 1000) - 5 * 60,
        exp: Math.floor(expiration.getTime() / 1000),
      },
      {
        secret: this.config.getOrThrow<string>('AUTH_JWT_ACCESS_TOKEN_SECRET'),
      }
    );

    this.logger.debug({
      class: AuthAccessService.name,
      method: this.generate.name,
      user,
      access_token: token,
      exp: expiration,
      msg: 'User generated an access token.',
    });

    return {
      access_token: token,
      exp: expiration.getTime(),
    }
  }

  async verify(token: string) {
    return await this.jwts.verifyAsync(token,
      {
        secret: this.config.getOrThrow<string>('AUTH_JWT_ACCESS_TOKEN_SECRET')
      }
    );
  }
}