interval.js

const repeatInterval = (remind_keyword, sequence, time_interval, name, duration) => {
    switch (remind_keyword) {
        case 'secondly':
            return [time_interval, 1, name, sequence, 1 * 1000, duration];
        case 'minutely':
            return [time_interval, 1, name, sequence, 60 * 1000, duration];
        case 'daily':
            return [time_interval, 1, name, sequence, 24 * 3600 * 1000, duration];
        case 'hourly':
            return [time_interval, 1, name, sequence, 3600 * 1000, duration];
        case 'once':
            return [time_interval, 0, name, sequence, 0, duration];
    }
}

const calcInterval = (datetime) => {
    let etime = new Date(datetime);
    let e_hr = etime.getHours();
    let e_min = etime.getMinutes();
    let e_sec = etime.getSeconds(); 
    let curtime = new Date();
    let cur_hr = curtime.getHours();
    let cur_min = curtime.getMinutes();
    let cur_sec = curtime.getSeconds();
    let interval = ((e_hr - cur_hr) * 3600 + (e_min - cur_min) * 60 + (e_sec - cur_sec)) * 1000;
    return interval;
}

const timeSpent = (d) => {
    let interval = calcInterval(d) * -1;
    let total = interval / 1000;
    let hr = Math.floor(total / 3600);
    let min = Math.floor((total % 3600) / 60);
    let sec = (total % 3600) % 60;
    return "You've spent " + hr.toString() + " hours " + min.toString() + " minutes " + sec.toString() + " seconds"
}

const addZero = (t) => {
    if (t < 10) {
        t = "0" + t;
    }
    return (t);
}

const getTime = (datetime) => {
    let etime = new Date(datetime);
    let e_hr = addZero(etime.getHours());
    let e_min = addZero(etime.getMinutes());
    let time =  e_hr + ":" + e_min;
    return time;
}

module.exports = {
    calcInterval: calcInterval,
    repeatInterval: repeatInterval,
    timeSpent: timeSpent,
    getTime: getTime
}