import { BadRequestException, CanActivate, ExecutionContext, ForbiddenException, Injectable } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Role } from 'src/auth/role.enum';
import { User } from 'src/user/entities/user.entity';

@Injectable()
export class RolesGuard implements CanActivate {
  constructor(
    private reflector: Reflector,
  ) { }

  async canActivate(context: ExecutionContext): Promise<boolean> {
    const requiredRoles = this.reflector.getAllAndOverride<Role[] | undefined>('roles', [
      context.getHandler(),
      context.getClass(),
    ]);

    if (!requiredRoles) return true;

    const request = context.switchToHttp().getRequest();
    const user = request.user as (User | void);

    if (!user) {
      throw new BadRequestException('服务器内部错误');
    }

    if (!requiredRoles.some(role => user.roles.includes(role))) {
      throw new ForbiddenException('权限不足');
    }

    return true;
  }
}