import React, {
  FC, useCallback,
} from 'react';

import type { IPage, HasObjectId } from '@growi/core';
import { useRouter } from 'next/router';

import { SupportedTargetModel } from '~/interfaces/activity';
import type { IInAppNotification } from '~/interfaces/in-app-notification';
import * as pageSerializers from '~/models/serializers/in-app-notification-snapshot/page';

import { ModelNotification } from './ModelNotification';
import { useActionMsgAndIconForModelNotification } from './useActionAndMsg';


export interface ModelNotificationUtils {
  Notification: FC
  publishOpen: () => void
}

export const usePageModelNotification = (notification: IInAppNotification & HasObjectId): ModelNotificationUtils | null => {

  const router = useRouter();
  const { actionMsg, actionIcon } = useActionMsgAndIconForModelNotification(notification);

  const getActionUsers = useCallback(() => {
    const latestActionUsers = notification.actionUsers.slice(0, 3);
    const latestUsers = latestActionUsers.map((user) => {
      return `@${user.name}`;
    });

    let actionedUsers = '';
    const latestUsersCount = latestUsers.length;
    if (latestUsersCount === 1) {
      actionedUsers = latestUsers[0];
    }
    else if (notification.actionUsers.length >= 4) {
      actionedUsers = `${latestUsers.slice(0, 2).join(', ')} and ${notification.actionUsers.length - 2} others`;
    }
    else {
      actionedUsers = latestUsers.join(', ');
    }

    return actionedUsers;
  }, [notification.actionUsers]);

  const isPageModelNotification = (notification: IInAppNotification & HasObjectId): notification is IInAppNotification<IPage> & HasObjectId => {
    return notification.targetModel === SupportedTargetModel.MODEL_PAGE;
  };

  if (!isPageModelNotification(notification)) {
    return null;
  }

  const actionUsers = getActionUsers();

  notification.parsedSnapshot = pageSerializers.parseSnapshot(notification.snapshot);

  const Notification = () => {
    return (
      <ModelNotification
        notification={notification}
        actionMsg={actionMsg}
        actionIcon={actionIcon}
        actionUsers={actionUsers}
      />
    );
  };

  const publishOpen = () => {
    if (notification.target != null) {
      // jump to target page
      const targetPagePath = (notification.target as IPage).path;
      if (targetPagePath != null) {
        router.push(targetPagePath);
      }
    }
  };

  return {
    Notification,
    publishOpen,
  };

};