import { ExecutionContext, Injectable, UnauthorizedException } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { AuthGuard } from '@nestjs/passport';
import { Observable } from 'rxjs';
import { SKIP_AUTH_KEY } from 'src/common/decorators/skip-auth.decorator';
import { AuthMessages } from 'src/common/enums/messages.enum';
import { JWT_STRATEGY_NAME } from 'src/constants';

@Injectable()
export class JwtAuthGuard extends AuthGuard(JWT_STRATEGY_NAME) {
  constructor(private reflector: Reflector) {
    super();
  }

  canActivate(
    context: ExecutionContext,
  ): boolean | Promise<boolean> | Observable<boolean> {
    const skipAuth = this.reflector.getAllAndOverride<boolean>(SKIP_AUTH_KEY, [
      context.getHandler(),
      context.getClass(),
    ]);

    if (skipAuth) return true;

    return super.canActivate(context);
  }

  handleRequest(err: unknown, user: any, _info: unknown) {
    if (err || !user)
      throw new UnauthorizedException(AuthMessages.TOKEN_EXPIRED_OR_INVALID);
    return user;
  }
}