//Default BLiP TimeZoneOffset = São Paulo (GMT-3)
var DEFAULT_OFFSET = 3;

// Receive the variables as parameters
function run(offset, start, end, workDays) {

    offset = parseInt(offset) + DEFAULT_OFFSET;

    let today = nowUTC(offset);
    let startDate = utcDate(start, offset);
    let endDate = utcDate(end, offset);
    return ((today - startDate) > 0) && ((endDate - today) > 0) && isWorkDay(today, workDays);
}

//Get now UTC Date
function nowUTC(offset){
    let now = new Date;
    let utc_timestamp = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(),
        now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds(), now.getUTCMilliseconds());

    return new Date(utc_timestamp + offset * 3600 * 1000);
}

//Get UTC Date
function utcDate(timeString, offset){
    let now = new Date;

    let hour = getValueByString('hour', timeString);
    let minutes = getValueByString('minutes', timeString)

    hour += DEFAULT_OFFSET;

    let utc_timestamp = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(),
        hour, minutes, 0, 0);
    return new Date(utc_timestamp + offset * 3600 * 1000);
}

//Get hour/minute by string with pattern HH:mm
function getValueByString(type, timeString){

    if(type === 'hour'){
        return parseInt(timeString.substring(0, timeString.indexOf(':')));
    }

    else if(type === 'minutes'){
        return parseInt(timeString.substring(timeString.indexOf(':') + 1, timeString.length));
    }

    return 0;
}

//Get if today is a work day
function isWorkDay(today, workDays){
    workDays = workDays.split(',');

    return workDays.indexOf(today.getDay().toString()) >= 0;
}