'use strict';

const db = require('../../models/index');

const bulkWriteChanges = ((changes) => {
    const changeLogsForDB = [];

    changes.forEach((change) => {
        const { oldReservation, newReservation } = change;
        const { reservationId, memberId, officeId, resourceId, start, end, canceled } = newReservation;

        const logEntry = {
            reservationId: oldReservation.reservationId || reservationId,
            memberId: oldReservation.memberId || memberId,
            officeId: oldReservation.officeId || officeId,
            oldResourceId: oldReservation.resourceId || resourceId,
            newResourceId: resourceId,
            oldStart: oldReservation.start || start,
            newStart: start,
            oldEnd: oldReservation.end || end,
            newEnd: end,
            canceled,
        };

        if (!oldReservation.start && !oldReservation.end && !oldReservation.resourceId){
            // new reservation
            logEntry.oldResourceId = null;
            logEntry.oldStart = null;
            logEntry.oldEnd = null;
        }

        if (newReservation.canceled){
            logEntry.newResourceId = null;
            logEntry.newStart = null;
            logEntry.newEnd = null;
        }

        changeLogsForDB.push(logEntry);
    });

    return db.bookingReservationChangeLog.bulkCreate(changeLogsForDB);
    // console.log(changeLogsForDB);
    // return new Promise((resolve) => resolve());
});

module.exports = {
    bulkWriteChanges,
};