MireaFrontend/src/services/tab-storage.service.ts

import {MatChipListbox} from "@angular/material/chips";
import {Injectable} from "@angular/core";

export class TabSelect {
  public index: number;
  public name: string;

  constructor(index: number, name: string) {
    this.index = index;
    this.name = name;
  }
}

export enum TabSelectType {
  group,
  professor,
  lecture,
  other
}

export interface TabSelectData {
  selected: TabSelect[] | null;
  type: TabSelectType;
}

@Injectable({
  providedIn: 'root'
})
export class TabStorageService {
  private static dataName = 'tabSelectedData';

  public static trySelectChip(index: number, chip: MatChipListbox, tryCount: number = 0) {
    setTimeout(() => {
      if (chip?._chips !== undefined && chip._chips.length !== 0) {
        let selected = chip._chips.find(x => x.value == index.toString());
        if (selected !== undefined) {
          selected.select();
          return;
        }
      }

      if (tryCount < 10)
        this.trySelectChip(index, chip, ++tryCount);
      else
        return;

    }, 100);
  }

  public static select(selected: TabSelect, type: TabSelectType, index: number) {
    let selectedData = this.selected;

    if (selectedData === null)
      selectedData = {} as TabSelectData;

    if (selectedData.type !== type || selectedData.selected === null || selectedData.selected.length === 0) {
      if (index !== 0)
        return;
      else
        selectedData.selected = [selected];
    } else {
      if (selectedData.selected.length < index)
        return;

      if (selectedData.selected.length - 1 === index)
        selectedData.selected[index] = selected;
      else if (selectedData.selected.length > index + 1)
        selectedData.selected = selectedData.selected.slice(0, index + 1);
      else
        selectedData.selected.push(selected);
    }

    selectedData.type = type;

    localStorage.setItem(this.dataName, JSON.stringify(selectedData));
  }

  public static get selected(): TabSelectData | null {
    let data = localStorage.getItem(this.dataName);

    if (data === null)
      return null;

    return JSON.parse(data) as TabSelectData;
  }
}