@cobuildlab/8base-chat/src/apollo/resolvers/ChannelMember.ts

Chat component that uses 8base

import get from 'lodash/get';

import { ChannelMember } from 'shared/graphql/__generated__';

export default {
  hasUnreads: (member: ChannelMember) => {
    const { lastReadTS, channel, user } = member;
    const msgItems = get(channel, 'messages.items', []);
    const { createdBy = {}, createdAt = null } = msgItems[msgItems.length - 1] || {};
    const userId = user && user.id;

    if (createdBy.id === userId) {
      return false;
    }

    if (!lastReadTS && createdAt) {
      return true;
    }

    if (createdAt) {
      const lastReadDate = new Date(lastReadTS);
      const lastChannelMsgDate = new Date(createdAt);

      return lastReadDate.getTime() <= lastChannelMsgDate.getTime();
    }

    return false;
  },
};