/**
 * MongooseJS plugin to auto-populate the _createdBy and _updatedBy document values (If they exist in the schema)
 */
'use strict'

import _ from 'moar-lodash'
import * as appRoot from 'app-root-path'
import Mongoose from 'mongoose'

const log           = appRoot.require('./dist/lib/utils/logger')({ plugin: 'Mongoose ByAccount'})
const accountHelper = appRoot.require('./dist/lib/helpers/account')

module.exports = ( schema, options ) => {
    schema.pre( 'save', function( next ) {
        // Only continue if the schema has createdBy or updatedBy
        if( _.isObject( schema.paths._createdBy ) || _.isObject( schema.paths._updatedBy ) ) {
            // Retrieve the account ID and username
            const accountId = accountHelper.getAccount( '_id' )
            const accountUn = accountHelper.getAccount( 'username' ) || 'Unknown'

            // If no account ID is found, then just return void, to avoid updating the updated/created by
            if( ! accountId ) {
                log.warn( `Unable to populate _createdBy - No account ID set in the Account Helper` )
            }

            // If Mongooses isNew value is true then its being created
            else if( this.isNew ) {
                if( _.isObject( schema.paths._createdBy ) ) {
                    log.debug( `Schema item _createdBy found - Populating with ${accountId} (Username: ${accountUn})` )
                    this._createdBy = accountId
                    this.markModified( '_createdBy' )
                }
                else {
                    log.debug( `Document is being created, but no _createdBy object found in schema` )
                }
            }

            // No isNew value, so its being updated
            else {
                if( _.isObject( schema.paths._updatedBy ) ) {
                    log.debug( `Schema item _updatedBy found - Populating with ${accountId} (Username: ${accountUn})` )
                    this._updatedBy = accountId
                    this.markModified( '_updatedBy' )
                }
                else {
                    log.debug( `Document is being updated, but no _updatedBy object found in schema` )
                }
            }
        }
        next()
    } )
}