PowerReserve.js

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

        this.element = document.getElementById(settings.id);
        this.interval = null;
        this.parent = parentWatch;
        this.minAngle = settings.range[0];
        this.maxAngle = settings.range[1];
        this.increment = 0.5;

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

    errorChecking(settings) {
        if (!settings.id) throw new ReferenceError('The PowerReserve class requires that an ID of the power reserve element be provided.');
        if (!settings.range) throw new ReferenceError('The PowerReserve class requires that a range of the power reserve element be provided.');
    }

    decrementReserve() {
        let currentRotate = this.parent.getCurrentRotateValue(this.element);

        if (currentRotate <= this.minAngle) {
            this.parent.stopInterval();
        } else {
            let newRotate = Number(currentRotate) - (this.increment / 2);
            this.element.style.transform = `rotate(${newRotate}deg)`;
        }
    }

    incrementReserve() {
        let currentRotate = this.parent.getCurrentRotateValue(this.element);

        if (currentRotate <= (this.maxAngle - this.increment) && currentRotate >= this.minAngle) {
            let newRotate = Number(currentRotate) + this.increment;
            this.element.style.transform = `rotate(${newRotate}deg)`;
        }
    }

    startInterval() {
        this.interval = setInterval(() => {
            this.decrementReserve();
        }, 1000);
    }

    stopInterval() {
        clearInterval(this.interval);
        this.interval = null;
    }

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

module.exports = PowerReserve;