import { CanActivate, ExecutionContext, Injectable } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { jwtConstants } from './constants';
import { Request } from 'express';

@Injectable()
export class CheckGuard implements CanActivate {
  constructor(private jwtService: JwtService) {}

  async canActivate(context: ExecutionContext): Promise<any> {
    const request = context.switchToHttp().getRequest();

    const token = this.extractTokenFromHeader(request);
    if (!token) {
      return true;
    }
    try {
      const payload = await this.jwtService.verifyAsync(token, {
        secret: jwtConstants.secret,
      });
      request['user'] = payload;
      return payload;
    } catch (err) {
      console.log(err);
      return true;
    }
  }

  private extractTokenFromHeader(request: Request): string | undefined {
    const [type, token] = request.headers.authorization?.split(' ') ?? [];
    return type === 'Bearer' ? token : undefined;
  }
}