import { Injectable, UnauthorizedException } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { ConfigService } from '@nestjs/config';

export interface JwtPayload {
  userId: string;
  accountSequence: string; // 格式: D + YYMMDD + 5位序号
  deviceId: string;
  type: 'access' | 'refresh';
  iat: number;
  exp: number;
}

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(private configService: ConfigService) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: configService.get('JWT_SECRET', 'default-secret'),
    });
  }

  async validate(payload: JwtPayload) {
    if (payload.type !== 'access') {
      throw new UnauthorizedException('无效的Token类型');
    }

    return {
      userId: payload.userId,
      accountSequence: payload.accountSequence,
      deviceId: payload.deviceId,
    };
  }
}
