feat: implement preferences pane

app/assets/javascripts/components/preferences/mock-state.ts

@@ -0,0 +1,50 @@
+import { IconType } from '@/components/Icon';
+import { action, computed, makeObservable, observable } from 'mobx';
+
+interface PreferenceItem {
+  icon: IconType;
+  label: string;
+}
+
+interface PreferenceListItem extends PreferenceItem {
+  id: number;
+}
+
+const predefinedItems: PreferenceItem[] = [
+  { label: 'General', icon: 'settings-filled' },
+  { label: 'Account', icon: 'user' },
+  { label: 'Appearance', icon: 'themes' },
+  { label: 'Security', icon: 'security' },
+  { label: 'Listed', icon: 'listed' },
+  { label: 'Shortcuts', icon: 'keyboard' },
+  { label: 'Accessibility', icon: 'accessibility' },
+  { label: 'Get a free month', icon: 'star' },
+  { label: 'Help & feedback', icon: 'help' },
+];
+
+export class MockState {
+  private readonly _items: PreferenceListItem[];
+  private _selectedId = 0;
+
+  constructor(items: PreferenceItem[] = predefinedItems) {
+    makeObservable<MockState, '_selectedId'>(this, {
+      _selectedId: observable,
+      items: computed,
+      select: action,
+    });
+
+    this._items = items.map((p, idx) => ({ ...p, id: idx }));
+    this._selectedId = this._items[0].id;
+  }
+
+  select(id: number) {
+    this._selectedId = id;
+  }
+
+  get items(): (PreferenceListItem & { selected: boolean })[] {
+    return this._items.map((p) => ({
+      ...p,
+      selected: p.id === this._selectedId,
+    }));
+  }
+}