import { Injectable, UnauthorizedException } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { PrismaService } from '../../prisma/prisma.service';

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(private prisma: PrismaService) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: process.env.JWT_SECRET || 'super-secret',
    });
  }

  async validate(payload: any) {
    const user = await this.prisma.user.findUnique({
      where: { id: payload.sub },
    });

    if (!user) {
      throw new UnauthorizedException('Người dùng không tồn tại hoặc phiên làm việc hết hạn');
    }

    // Note: We allow anonymous users to pass JWT validation
    // Individual endpoints decide whether to accept anonymous users based on their guard
    return user;
  }
}