const licenseUtils = {

    // version 2/19/20 5:51pm

    hasTrialExpiredByStartDate: function hasTrialExpiredByStartDate(startDate) {
        const logHdr = 'licenseUtils.hasTrialExpiredByStartDate: ';
        log(logHdr + 'enter');
        log(logHdr + 'startDate=' + startDate);

        const today = new Date();
        // get the current UTC date and time

        const diffDays = licenseUtils.getDaysBetweenDates(startDate, today);
        // get the number of days since the start date

        var trialRem = (30 - diffDays);

        if (trialRem < 0)
            trialRem = 0;

        trialRem = Math.round(trialRem);

        const expired = (trialRem < 1);

        log(logHdr + 'expired=' + expired);
        log(logHdr + 'leave');

        return expired;
    },

    getDaysBetweenDates: function getDaysBetweenDates(earlyDate, lateDate) {
        // return the number of days between the two dates

        const logHdr = 'licenseUtils.getDaysBetweenDates: ';
        log(logHdr + 'enter');
        log(logHdr + 'earlyDate=' + earlyDate);
        log(logHdr + 'lateDate=' + lateDate);

        const diffTime = lateDate.getTime() - earlyDate.getTime();
        // get the time difference between the two dates

        const diffDays = diffTime / (1000 * 3600 * 24); 
        // get the number of days between the two dates

        log(logHdr + 'diffDays=' + diffDays);
        log(logHdr + 'leave');

        return diffDays;
    },

    getUserAccountAsync: async function getUserAccountAsync(auth0Client) {
        // return a user account object or null if none is available

        const logHdr = 'licenseUtils.getUserAccountAsync: ';
        log(logHdr + 'enter');
        log(logHdr + 'atc auth0Client.getUser');

        const user = await auth0Client.getUser();
        // get user info

        log(logHdr + 'bf auth0Client.getUser');

        if (user === null) {
            // if we didn't get a user

            log(logHdr + 'user is NULL, so we give up and return null');
            log(logHdr + 'leave');

            return null;
        }

        const appMetadata = user['https://invisiblesolutionslenses.com/app-metadata'];
        // read the application metadata, written by the JavaScript rule stored in Auth0

        if (typeof appMetadata === "undefined") {
            // if none

            log(logHdr + 'we got a user, but app-metadata is UNDEFINED, so we return null');
            log(logHdr + 'leave');

            return null;
        }

        // sample appMetadata
        //{
        //    "userStatus": "trial",
        //    "startDate": "2020-02-05T13:36:51.603Z"
        //}

        const userAccount = {
            startDate: appMetadata.startDate,
            userStatus: appMetadata.userStatus
        };
        // allocate a user account object

        log(logHdr + 'we got the userAccount data');
        log(logHdr + 'userAccount.startDate=' + userAccount.startDate);
        log(logHdr + 'userAccount.userStatus=' + userAccount.userStatus);
        log(logHdr + 'leave');

        return userAccount;
    }
};