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

'use strict';

const path = require('path');

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const CommentHistorySchema = new Schema({
  created: { type: Date },
  content: { type: String, maxlength: 3000 },
});

const { CommentStats, CommentStatsDefaults } = require(path.join(__dirname, 'lib', 'resource-stats.js'));

const COMMENT_STATUS_LIST = ['published', 'removed', 'mod-warn', 'mod-removed'];

const CommentSchema = new Schema({
  created: { type: Date, default: Date.now, required: true, index: 1 },
  resourceType: { type: String, enum: ['Post', 'Page', 'Newsletter'], required: true },
  resource: { type: Schema.ObjectId, required: true, index: 1, refPath: 'resourceType' },
  author: { type: Schema.ObjectId, required: true, index: 1, ref: 'User' },
  replyTo: { type: Schema.ObjectId, index: 1, ref: 'Comment' },
  status: { type: String, enum: COMMENT_STATUS_LIST, default: 'published', required: true },
  content: { type: String, required: true, maxlength: 3000 },
  contentHistory: { type: [CommentHistorySchema], select: false },
  stats: { type: CommentStats, default: CommentStatsDefaults, required: true },
});

/*
 * An index to optimize finding replies to a specific comment
 */
CommentSchema.index({
  resource: 1,
  replyTo: 1,
}, {
  partialFilterExpression: { $exists: { replyTo: 1 } },
  name: 'comment_replies',
});

module.exports = mongoose.model('Comment', CommentSchema);