// resource.js
// Copyright (C) 2021 Digital Telepresence, LLC
// License: Apache-2.0

'use strict';

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

const mongoose = require('mongoose');

const ResourceView = mongoose.model('ResourceView');

class ResourceService extends SiteService {

  constructor (dtp) {
    super(dtp, module.exports);
    this.populateResourceView = [
      {
        path: 'resource',
      },
    ];
  }

  /**
   * Records 24-hour unique view counts for a given resource happening on a
   * given ExpressJS Request. Views are uniqued by stripping time from the
   * current Date, and upserting a tracking object in MongoDB.
   *
   * @param {Request} req 
   * @param {String} resourceType 'Post', 'Page', or 'Newsletter'
   * @param {mongoose.Types.ObjectId} resourceId The _id of the object for which
   * a view is being tracked.
   */
  async recordView (req, resourceType, resourceId) {
    const CURRENT_DAY = new Date();
    CURRENT_DAY.setHours(0, 0, 0, 0);

    let uniqueKey = req.ip.toString().trim().toLowerCase();
    if (req.user) {
      uniqueKey += `:user:${req.user._id.toString()}`;
    }

    const response = await ResourceView.updateOne(
      {
        created: CURRENT_DAY,
        resourceType,
        resource: resourceId,
        uniqueKey,
      },
      {
        $inc: { viewCount: 1 },
      },
      { upsert: true },
    );
    this.log.debug('resource view', { response });
    if (response.upsertedCount > 0) {
      const Model = mongoose.model(resourceType);
      await Model.updateOne(
        { _id: resourceId },
        {
          $inc: { 'stats.totalViewCount': 1 },
        },
      );
    }
  }
}

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