import { Injectable, UnauthorizedException } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import type {
  AuthUser,
  JwtAccessPayload,
} from '../../../common/auth/auth-user';
import { UsersService } from '../../users/users.service';
import { RevokedAccessTokensRepository } from '../revoked-access-tokens.repository';

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy, 'jwt') {
  constructor(
    config: ConfigService,
    private readonly usersService: UsersService,
    private readonly revokedAccessTokensRepository: RevokedAccessTokensRepository,
  ) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: config.getOrThrow<string>('JWT_ACCESS_SECRET'),
      algorithms: ['HS256'],
    });
  }

  async validate(payload: JwtAccessPayload): Promise<AuthUser> {
    if (payload.typ !== 'access' || !payload.sub || !payload.jti) {
      throw new UnauthorizedException('Invalid access token');
    }

    const revoked = await this.revokedAccessTokensRepository.exists(
      payload.jti,
    );
    if (revoked) {
      throw new UnauthorizedException('Access token revoked');
    }

    const user = await this.usersService.findById(payload.sub);
    if (!user) {
      throw new UnauthorizedException('User not found');
    }
    this.usersService.assertCanAuthenticate(user);

    return {
      id: user.id,
      username: user.username,
      jti: payload.jti,
      isSuperadmin: user.isSuperadmin,
    };
  }
}