WeekIndicator.js

class WeekIndicator {
    constructor(settings, parentWatch) {
        this.errorChecking(settings);

        this.element = document.getElementById(settings.id || settings);
        this.parent = parentWatch;
        this.iso = settings.iso || false;
        this.invert = settings.invert || false;

        this.week = 0;
        this.weekAmount = this.iso ? 53 : 52;
        this.increment = 360 / this.weekAmount;

        if (!this.parent.testing) this.init();
    }

    errorChecking(settings) {
        if (typeof settings === 'object') {
            if (!settings.id) throw new ReferenceError('The Week Indicator class requires that an ID of the element be provided.');
        } else if (typeof settings !== 'string') {
            throw new ReferenceError('The Week Indicator class expects either a settings object or a string containing the element\'s ID.');
        }
    }

    getWeekValue() {
        const rightNow = this.parent.rightNow;
        this.week = this.iso ? rightNow.isoWeek() - 1 : rightNow.week() - 1;

        this.rotateHands();
    }

    rotateHands() {
        let rotateVal = this.week * this.increment;
        if (this.invert) rotateVal *= -1;

        this.element.style.transform = `rotate(${rotateVal}deg)`;
    }

    init() {
        this.getWeekValue();
    }
}

module.exports = WeekIndicator;