import coreModule from 'app/core/core_module';
import { BackendSrv } from 'app/core/services/backend_srv';

const hitTypes = {
  FOLDER: 'dash-folder',
  DASHBOARD: 'dash-db',
};

export class ValidationSrv {
  rootName = 'general';

  /** @ngInject */
  constructor(private backendSrv: BackendSrv) {}

  validateNewDashboardName(folderId: any, name: string) {
    return this.validate(folderId, name, 'A dashboard in this folder with the same name already exists');
  }

  validateNewFolderName(name: string) {
    return this.validate(0, name, 'A folder or dashboard in the general folder with the same name already exists');
  }

  private validate(folderId: any, name: string, existingErrorMessage: string) {
    name = (name || '').trim();
    const nameLowerCased = name.toLowerCase();

    if (name.length === 0) {
      return Promise.reject({
        type: 'REQUIRED',
        message: 'Name is required',
      });
    }

    if (folderId === 0 && nameLowerCased === this.rootName) {
      return Promise.reject({
        type: 'EXISTING',
        message: 'This is a reserved name and cannot be used for a folder.',
      });
    }

    const promises = [];
    promises.push(this.backendSrv.search({ type: hitTypes.FOLDER, folderIds: [folderId], query: name }));
    promises.push(this.backendSrv.search({ type: hitTypes.DASHBOARD, folderIds: [folderId], query: name }));

    return Promise.all(promises).then(res => {
      let hits: any[] = [];

      if (res.length > 0 && res[0].length > 0) {
        hits = res[0];
      }

      if (res.length > 1 && res[1].length > 0) {
        hits = hits.concat(res[1]);
      }

      for (const hit of hits) {
        if (nameLowerCased === hit.title.toLowerCase()) {
          throw {
            type: 'EXISTING',
            message: existingErrorMessage,
          };
        }
      }

      return;
    });
  }
}

coreModule.service('validationSrv', ValidationSrv);