import { useMemo } from "react";
import { useNavigate } from "react-router";
import type { NotificationItem } from "@/domain/notifications/types/notification-feed";
import { useNotificationSession } from "@/domain/notifications/session/notification-session-context";
import { useNotificationFeed } from "@/domain/notifications/use-cases/use-notification-feed";
import { notificationTargetUrl } from "@/domain/notifications/utils/notification-target-url";
import {
  isDismissable,
  visibleNotificationSections,
} from "@/domain/notifications/utils/visible-notification-sections";
import { useAuthContext } from "@/providers/auth-context";

export function useNotificationCenter(onNavigate?: () => void) {
  const navigate = useNavigate();
  const { user } = useAuthContext();
  const feed = useNotificationFeed();
  const { dismissedIds, readIds, dismiss, markRead } = useNotificationSession();

  const sections = useMemo(
    () => visibleNotificationSections(feed.data?.sections ?? [], dismissedIds),
    [feed.data, dismissedIds],
  );
  const items = useMemo(() => sections.flatMap((section) => section.items), [sections]);
  const unreadIds = useMemo(
    () => new Set(items.filter((item) => !readIds.has(item.id)).map((item) => item.id)),
    [items, readIds],
  );

  const open = (item: NotificationItem, url = notificationTargetUrl(item, user?.id)) => {
    markRead([item.id]);
    if (url == null) return;
    onNavigate?.();
    navigate(url);
  };

  return {
    sections,
    unreadIds,
    isLoading: feed.isLoading,
    hasData: feed.data != null,
    error: feed.error,
    open,
    dismiss: (item: NotificationItem) => dismiss([item.id]),
    dismissAll: () => dismiss(items.filter(isDismissable).map((item) => item.id)),
    markAllRead: () => markRead(items.map((item) => item.id)),
  };
}

export type NotificationCenter = ReturnType<typeof useNotificationCenter>;