import { CanActivate, ExecutionContext, Injectable, UnauthorizedException } from '@nestjs/common';
import { AppLogger } from '../../logger';
import { Observable } from 'rxjs';
import { ProjectGuardService } from './services';
import { DecodedToken } from '../dto';

@Injectable()
export class ProjectGuard implements CanActivate {

  private readonly TAG: string = `${this.constructor.name}`;

  constructor(private readonly projectGuardService: ProjectGuardService) {
    AppLogger.log('Init', this.TAG);
  }

  canActivate(
    context: ExecutionContext,
  ): boolean | Promise<boolean> | Observable<boolean> {
    const request = context.switchToHttp().getRequest();
    const projectShortId: string = request.params ? request.params.project_short_id : null;
    if (request && request.headers && request.headers.authorization && projectShortId) {
      if (this.validateRequest(request.token, projectShortId)) {
        request.projectShortId = projectShortId;
        return true;
      }
    }
    AppLogger.error('No Permissions Property on Headers or no project short id on params', this.TAG);
    throw new UnauthorizedException();
  }

  async validateRequest(token: DecodedToken, projectShortId: string): Promise<boolean> {
    try {
      AppLogger.log(`Verify request for project - ${projectShortId}`, this.TAG);
      const isValid: boolean = await this.projectGuardService.verify(token, projectShortId);
      if (!isValid) {
        throw new UnauthorizedException();
      }
      return isValid;
    } catch (e) {
      AppLogger.error(e, this.TAG);
      throw new UnauthorizedException();
    }

  }


}