import _ from "lodash";
import coreModule from "app/core/core_module";
import appEvents from "app/core/app_events";

export class FolderPickerCtrl {
  initialTitle: string;
  initialFolderId?: number;
  labelClass: string;
  onChange: any;
  onLoad: any;
  onCreateFolder: any;
  enterFolderCreation: any;
  exitFolderCreation: any;
  enableCreateNew: boolean;
  rootName = "Root";
  folder: any;
  createNewFolder: boolean;
  newFolderName: string;
  newFolderNameTouched: boolean;
  hasValidationError: boolean;
  validationError: any;

  /** @ngInject */
  constructor(private backendSrv, private validationSrv) {
    if (!this.labelClass) {
      this.labelClass = "width-7";
    }

    this.loadInitialValue();
  }

  getOptions(query) {
    var params = {
      query: query,
      type: "dash-folder"
    };

    return this.backendSrv.search(params).then(result => {
      if (
        query === "" ||
        query.toLowerCase() === "r" ||
        query.toLowerCase() === "ro" ||
        query.toLowerCase() === "roo" ||
        query.toLowerCase() === "root"
      ) {
        result.unshift({ title: this.rootName, id: 0 });
      }

      if (this.enableCreateNew && query === "") {
        result.unshift({ title: "-- New Folder --", id: -1 });
      }

      return _.map(result, item => {
        return { text: item.title, value: item.id };
      });
    });
  }

  onFolderChange(option) {
    if (option.value === -1) {
      this.createNewFolder = true;
      this.enterFolderCreation();
      return;
    }
    this.onChange({ $folder: { id: option.value, title: option.text } });
  }

  newFolderNameChanged() {
    this.newFolderNameTouched = true;

    this.validationSrv
      .validateNewDashboardOrFolderName(this.newFolderName)
      .then(() => {
        this.hasValidationError = false;
      })
      .catch(err => {
        this.hasValidationError = true;
        this.validationError = err.message;
      });
  }

  createFolder(evt) {
    if (evt) {
      evt.stopPropagation();
      evt.preventDefault();
    }

    return this.backendSrv
      .createDashboardFolder(this.newFolderName)
      .then(result => {
        appEvents.emit("alert-success", ["Folder Created", "OK"]);

        this.closeCreateFolder();
        this.folder = {
          text: result.dashboard.title,
          value: result.dashboard.id
        };
        this.onFolderChange(this.folder);
      });
  }

  cancelCreateFolder(evt) {
    if (evt) {
      evt.stopPropagation();
      evt.preventDefault();
    }

    this.closeCreateFolder();
    this.loadInitialValue();
  }

  private closeCreateFolder() {
    this.exitFolderCreation();
    this.createNewFolder = false;
    this.hasValidationError = false;
    this.validationError = null;
    this.newFolderName = "";
    this.newFolderNameTouched = false;
  }

  private loadInitialValue() {
    if (this.initialFolderId && this.initialFolderId > 0) {
      this.getOptions("").then(result => {
        this.folder = _.find(result, { value: this.initialFolderId });
        this.onFolderLoad();
      });
    } else {
      if (this.initialTitle) {
        this.folder = { text: this.initialTitle, value: null };
      } else {
        this.folder = { text: this.rootName, value: 0 };
      }

      this.onFolderLoad();
    }
  }

  private onFolderLoad() {
    if (this.onLoad) {
      this.onLoad({
        $folder: { id: this.folder.value, title: this.folder.text }
      });
    }
  }
}

export function folderPicker() {
  return {
    restrict: "E",
    templateUrl:
      "public/app/features/dashboard/folder_picker/folder_picker.html",
    controller: FolderPickerCtrl,
    bindToController: true,
    controllerAs: "ctrl",
    scope: {
      initialTitle: "<",
      initialFolderId: "<",
      labelClass: "@",
      rootName: "@",
      onChange: "&",
      onLoad: "&",
      onCreateFolder: "&",
      enterFolderCreation: "&",
      exitFolderCreation: "&",
      enableCreateNew: "@"
    }
  };
}

coreModule.directive("folderPicker", folderPicker);