import {sortByNumberAscending, sortByStringAscending, sortByDateAscending} from '../../services/sorting.service';
import {Priority, ScrumTask, ScrumUserstory, ScrumSprint} from '../../services/backend.service';
import { ActivatedRoute, ParamMap } from '@angular/router';

export abstract class TableComponentBase<T extends ScrumTask | ScrumUserstory | ScrumSprint> {
  public sortBy: string;
  public sortDescending = false;
  public items: T[] = [];
  public highlightId: number;
  protected route: ActivatedRoute;

  /**
   * Constructor that handels ParamMap extraction from given route and calls the applyFilterParameters method with the extracted ParamMap.
   * @param route ActivatedRoute object to get ParamMap from.
   */
  public constructor(route: ActivatedRoute)
  {
    this.route = route;
    this.applyFilterParameters(this.route.snapshot.paramMap);
    this.route.paramMap.subscribe((map) => this.applyFilterParameters(map));
  }

  //#region getters
  /**
   * Returns a string array containing all possible values of the enum Priority.
   */
  public getAllPriorities(): string[] {
    return Object.values(Priority);
  }
  //#endregion getters

  //#region tableFunctions

  /**
   * Parses ParamMap from url (route) and sets parsed params accordingly.
   * Only used to extract the id from the ParamMap to highlight a certain item.
   * @param params ParamMap read from url
   */
  private applyFilterParameters(params: ParamMap) {
    if (params.has('id')) {
      this.highlightId = parseInt(params.get('id'));
    }
  }
  //#endregion tableFunctions

  //#region sorters

  /**
   * Sorts items by number of a provided kay
   * @param by TODO:
   * @param key property/key to sort the items by
   */
  protected doNumericSort(by: string, key: (item: T) => number) {
    if (this.sortBy === by) {
      this.sortDescending = !this.sortDescending;
    } else {
      this.sortBy = by;
    }

    this.items = sortByNumberAscending(this.items, key);
    if (this.sortDescending) {
      this.items = this.items.reverse();
    }
  }

  /**
   * Sorts items by string of a provided kay
   * @param by TODO:
   * @param key property/key to sort the items by
   */
  protected doStringSort(by: string, key: (item: T) => string) {
    if (this.sortBy === by) {
      this.sortDescending = !this.sortDescending;
    } else {
      this.sortBy = by;
    }

    this.items = sortByStringAscending(this.items, key);
    if (this.sortDescending) {
      this.items = this.items.reverse();
    }
  }

  /**
   * Sorts items by date of a provided kay
   * @param by TODO:
   * @param key property/key to sort the items by
   */
  protected doDateSort(by: string, key: (item: T) => Date) {
    if (this.sortBy === by) {
      this.sortDescending = !this.sortDescending;
    } else {
      this.sortBy = by;
    }

    this.items = sortByDateAscending(this.items, key);
    if (this.sortDescending) {
      this.items = this.items.reverse();
    }
  }

  /**
   * Sorts this tabel's items by id
   */
  public sortById() {
    this.doNumericSort('id', (obj) => obj.id);
  }

  /**
   * Sorts this tabel's items by title
   */
  public sortByTitle() {
    this.doStringSort('title', (obj) => obj.title);
  }
  //#endregion sorters
}