import * as crypto from 'crypto';
import { Injectable } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';

@Injectable()
export class TokenService {
  constructor(private readonly jwtService: JwtService) {}

  generateAccessToken(user: { id: bigint; email?: string | null; role?: string | null }): Promise<string> {
    return this.jwtService.signAsync({
      sub: String(user.id),
      email: user.email,
      role: user.role,
    });
  }

  generateRefreshToken(): { token: string; hash: string } {
    const token = crypto.randomBytes(48).toString('hex');
    const hash = crypto.createHash('sha256').update(token).digest('hex');
    return { token, hash };
  }

  hashToken(token: string): string {
    return crypto.createHash('sha256').update(token).digest('hex');
  }
}