import { z } from 'zod';

/**
 * In-app notifications (issue #94, data-model.md §notifications): watchers
 * learn about page changes (version snapshots, ADR 0013's change unit) and
 * new comments. Generation excludes the actor and re-checks page read
 * permission at delivery time.
 */

export const NOTIFICATION_TYPES = ['page_changed', 'comment_added'] as const;
export type NotificationType = (typeof NOTIFICATION_TYPES)[number];

export interface NotificationPayload {
  pageId: string;
  pageTitle: string;
  pageSlug: string;
  pondSlug: string;
  pondName: string;
  /** Display names of the acting users (first few, for the list entry). */
  actorNames: string[];
}

export interface NotificationView {
  id: string;
  type: NotificationType;
  payload: NotificationPayload;
  createdAt: string;
  readAt: string | null;
}

export const NOTIFICATION_PAGE_SIZE = 20;

export const notificationListQuerySchema = z.object({
  page: z.coerce.number().int().min(1).default(1),
});
export type NotificationListQuery = z.infer<typeof notificationListQuerySchema>;

export interface NotificationListView {
  notifications: NotificationView[];
  unreadCount: number;
  page: number;
  pageCount: number;
}

/** E-mail digest cadence (issue #95). */
export const DIGEST_FREQUENCIES = ['hourly', 'daily', 'off'] as const;
export type DigestFrequency = (typeof DIGEST_FREQUENCIES)[number];