feat(mentions): client api types, store, snapshot + message hooks

src/hooks/mentions/mentionsStore.ts

@@ -0,0 +1,43 @@
+import { IMentionEntry } from '../../api/mentions';
+
+let mentions: IMentionEntry[] = [];
+const listeners = new Set<() => void>();
+
+const emit = () => { for(const l of listeners) l(); };
+
+export const subscribeMentions = (onChange: () => void): (() => void) =>
+{
+    listeners.add(onChange);
+    return () => { listeners.delete(onChange); };
+};
+
+export const getMentionsSnapshot = (): ReadonlyArray<IMentionEntry> => mentions;
+
+export const getUnreadCount = (): number => mentions.reduce((n, m) => n + (m.read ? 0 : 1), 0);
+
+export const setMentions = (list: IMentionEntry[]): void =>
+{
+    mentions = [...list].sort((a, b) => b.mentionId - a.mentionId);
+    emit();
+};
+
+export const addMention = (entry: IMentionEntry): void =>
+{
+    if(mentions.some(m => m.mentionId === entry.mentionId && entry.mentionId !== 0)) return;
+    mentions = [entry, ...mentions];
+    emit();
+};
+
+export const markRead = (mentionId: number): void =>
+{
+    mentions = mentions.map(m => m.mentionId === mentionId ? { ...m, read: true } : m);
+    emit();
+};
+
+export const markAllRead = (): void =>
+{
+    mentions = mentions.map(m => m.read ? m : { ...m, read: true });
+    emit();
+};
+
+export const resetMentions = (): void => { mentions = []; emit(); };