feat: add saving of user's selection

src/components/common/tab-storage/tab-storage.component.ts

@@ -0,0 +1,83 @@
+import {MatChipListbox} from "@angular/material/chips";
+
+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;
+}
+
+export class TabStorageComponent {
+  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)
+        return;
+
+      this.trySelectChip(index, chip, ++tryCount);
+    }, 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;
+
+    console.log(selectedData);
+
+    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;
+  }
+}