/**
 * This is the Insulin class
 * Create a new instance of this class for basal and fast-acting insulins.
 *
 *  param {number} onsetDelay - the number of seconds before the insulin effect kicks instance.
 *  param {number} duration - the number of seconds of the total effective duration of this insulin.
 *  param {number} peak - the number of seconds to the peak action of the insulin. Set to 0 for a flat (consistent) effect. Is modelled as a bell curve centered on the peak.
 * param {number} power - the effect of the insulin. This is the peak power for insulins wiht a peak response.
 */
const magik = magikcraft.io;
const secondsPerTick = 1;

function Insulin(onsetDelay = 0, duration, power, peak = 0) {
    this.onsetDelay = onsetDelay;
    this.duration = duration;
    this.peak = peak;
    this.power = power;
}

Insulin.prototype.calculateInsulinEffect = function(elapsedTime) {
    if (this.peak === 0) {
        return this.power;
    }
    const a = Math.atan(this.power / (this.duration * 0.5));
    const getE = () => {
        if (elapsedTime <= this.duration / 2) {
            return a * elapsedTime;
        } else {
            return a * this.duration - elapsedTime;
        }
    };
    const e = getE();
    const effect = e * a;
}

Insulin.prototype.take = function(amount) {
    let elapsedTime = this.onsetDelay;
    const magik = magikcraft.io
    const mct1 = magik.global('mct1');

    magik.setTimeout(() => {
        // the insulin starts to act
        let _loop = magik.setInterval(
            () => {
                if (elapsedTime >= this.duration - this.onsetDelay) {
                    // insulin effect exhausted
                    magik.clearInterval(_loop);
                    return;
                }
                // == Do Insulin effect ==
                // calculate insulin power
                const effect = this.calculateInsulinEffect(elapsedTime);
                mct1.mutateBGL(effect);
                elapsedTime += secondsPerTick;
            },
            secondsPerTick
        );
    }, this.onsetDelay);
}

module.exports = Insulin;