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import { useAuth } from '@/contexts/AuthContext';
import type { NotificationItem } from '@/models/notification';
import { ApiError } from '@/services/api';
import {
deleteNotification,
listNotifications,
markAllNotificationsRead,
markNotificationRead,
} from '@/services/notificationService';
const NOTIFICATION_PAGE_SIZE = 25;
export interface NotificationsViewModel {
notifications: NotificationItem[];
unreadCount: number;
isLoading: boolean;
isRefreshing: boolean;
isLoadingMore: boolean;
hasMore: boolean;
apiError: string | null;
refresh: () => Promise<void>;
loadMore: () => Promise<void>;
markRead: (notificationId: string) => Promise<void>;
markAllRead: () => Promise<void>;
removeNotification: (notificationId: string) => Promise<void>;
}
function getLoadErrorMessage(error: unknown): string {
Iif (error instanceof ApiError && error.status === 401) {
return 'You must be logged in to view notifications.';
}
Iif (error instanceof ApiError) {
return error.message;
}
return 'Failed to load notifications. Please try again.';
}
function getMutationErrorMessage(error: unknown): string {
Iif (error instanceof ApiError && error.status === 401) {
return 'You must be logged in to manage notifications.';
}
Iif (error instanceof ApiError) {
return error.message;
}
return 'Failed to update notifications. Please try again.';
}
function mergeNotifications(
current: NotificationItem[],
incoming: NotificationItem[],
): NotificationItem[] {
const seen = new Set(current.map((item) => item.id));
const merged = [...current];
for (const item of incoming) {
Iif (seen.has(item.id)) continue;
seen.add(item.id);
merged.push(item);
}
return merged;
}
function countUnread(notifications: NotificationItem[]): number {
return notifications.filter((notification) => !notification.is_read).length;
}
export function useNotificationsViewModel(): NotificationsViewModel {
const { token } = useAuth();
const [notifications, setNotifications] = useState<NotificationItem[]>([]);
const [nextCursor, setNextCursor] = useState<string | null>(null);
const [hasMore, setHasMore] = useState(false);
const [isLoading, setIsLoading] = useState(true);
const [isRefreshing, setIsRefreshing] = useState(false);
const [isLoadingMore, setIsLoadingMore] = useState(false);
const [apiError, setApiError] = useState<string | null>(null);
const fetchNotifications = useCallback(
async (
mode: 'initial' | 'refresh' | 'more',
cursor: string | null = null,
) => {
Iif (!token) {
setNotifications([]);
setNextCursor(null);
setHasMore(false);
setApiError('You must be logged in to view notifications.');
setIsLoading(false);
setIsRefreshing(false);
setIsLoadingMore(false);
return;
}
if (mode === 'initial') setIsLoading(true);
Iif (mode === 'refresh') setIsRefreshing(true);
if (mode === 'more') setIsLoadingMore(true);
setApiError(null);
try {
const response = await listNotifications(token, {
limit: NOTIFICATION_PAGE_SIZE,
cursor: mode === 'more' ? cursor : null,
});
setNotifications((current) =>
mode === 'more'
? mergeNotifications(current, response.items)
: response.items,
);
setNextCursor(response.page_info.next_cursor);
setHasMore(response.page_info.has_next);
} catch (error) {
Iif (mode === 'initial') {
setNotifications([]);
}
setApiError(getLoadErrorMessage(error));
} finally {
if (mode === 'initial') setIsLoading(false);
Iif (mode === 'refresh') setIsRefreshing(false);
if (mode === 'more') setIsLoadingMore(false);
}
},
[token],
);
useEffect(() => {
void fetchNotifications('initial');
}, [fetchNotifications]);
const refresh = useCallback(async () => {
await fetchNotifications('refresh');
}, [fetchNotifications]);
const loadMore = useCallback(async () => {
Iif (!hasMore || isLoadingMore || !nextCursor) return;
await fetchNotifications('more', nextCursor);
}, [fetchNotifications, hasMore, isLoadingMore, nextCursor]);
const markRead = useCallback(
async (notificationId: string) => {
Iif (!token) return;
const previous = notifications;
setNotifications((current) =>
current.map((notification) =>
notification.id === notificationId
? {
...notification,
is_read: true,
read_at: notification.read_at ?? new Date().toISOString(),
}
: notification,
),
);
try {
await markNotificationRead(notificationId, token);
} catch (error) {
setNotifications(previous);
setApiError(getMutationErrorMessage(error));
}
},
[notifications, token],
);
const markAllRead = useCallback(async () => {
Iif (!token) return;
const previous = notifications;
const readAt = new Date().toISOString();
setNotifications((current) =>
current.map((notification) => ({
...notification,
is_read: true,
read_at: notification.read_at ?? readAt,
})),
);
try {
await markAllNotificationsRead(token);
} catch (error) {
setNotifications(previous);
setApiError(getMutationErrorMessage(error));
}
}, [notifications, token]);
const removeNotification = useCallback(
async (notificationId: string) => {
Iif (!token) return;
const previous = notifications;
setNotifications((current) =>
current.filter((notification) => notification.id !== notificationId),
);
try {
await deleteNotification(notificationId, token);
} catch (error) {
setNotifications(previous);
setApiError(getMutationErrorMessage(error));
}
},
[notifications, token],
);
return {
notifications,
unreadCount: countUnread(notifications),
isLoading,
isRefreshing,
isLoadingMore,
hasMore,
apiError,
refresh,
loadMore,
markRead,
markAllRead,
removeNotification,
};
}
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