// chat.js
// Copyright (C) 2022 DTP Technologies, LLC
// License: Apache-2.0

'use strict';

const mongoose = require('mongoose');
const ChatMessage = mongoose.model('ChatMessage');

const ioEmitter = require('socket.io-emitter');
const striptags = require('striptags');
const unzalgo = require('unzalgo');

const { SiteService } = require('../../lib/site-lib');

class ChatService extends SiteService {

  constructor (dtp) {
    super(dtp, module.exports);
    this.populateContentReport = [
      {
        path: 'user',
        select: '_id username username_lc displayName picture',
      },
      {
        path: 'resource',
        populate: [
          {
            path: 'author',
            select: '_id username username_lc displayName picture',
          },
        ],
      },
    ];
  }

  async start ( ) {
    this.emitter = ioEmitter(this.dtp.redis);
  }

  async removeMessage (message) {
    await ChatMessage.deleteOne({ _id: message._id });
    this.emitter(`site:${this.dtp.config.site.domainKey}:chat`, {
      command: 'removeMessage',
      params: { messageId: message._id },
    });
  }

  /**
   * Filters an input string to remove "zalgo" text and to strip all HTML tags.
   * This prevents cross-site scripting and the malicious destruction of text
   * layouts.
   * @param {String} content The text content to be filtered.
   * @returns the filtered text
   */
  filterText (content) {
    return striptags(unzalgo.clean(content.trim()));
  }
}

module.exports = {
  slug: 'chat',
  name: 'chat',
  create: (dtp) => { return new ChatService(dtp); },
};