/**
 * fruithost | OpenSource Hosting
 *
 * @author Adrian Preuß
 * @version 1.0.0
 * @license MIT
 */

const Statistics = (function Statistics() {
    this.element = null;
    this.canvas = null;
    this.context = null;
    this.stopped = false;
    this.interval = null;
    this.position = 0;
    this.data = [0.00];
    this.grid = [0, 0, 0, 0.5];
    this.colors = [[0, 0, 0, 0]];

    this.__constructor = function __constructor(element) {
        this.element = document.querySelector(element);
        this.canvas = document.createElement('canvas');
        this.context = this.canvas.getContext('2d');

        window.addEventListener("resize", this.resize.bind(this));
        this.resize();
    };

    this.setColor = function setColor(color) {
        this.grid = color;
    };

    this.start = function start() {
        this.stopped = false;
    };

    this.stop = function stop() {
        this.stopped = true;
    };

    this.resize = function resize() {
        this.canvas.width = (this.element.parentNode.innerWidth || this.element.parentNode.clientWidth || this.element.parentNode.clientWidth);
        this.canvas.height = 100;

        this.draw();
    };

    this.add = function add(value, color) {
        this.colors.push(color);
        this.data.push(value);
    };

    this.draw = function draw() {
        this.context.save();
        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
        this.context.restore();

        let bw = this.canvas.width - this.position;
        let bh = this.canvas.height;
        let c = 4;
        let d = 1;

        /* Vertical Lines */
        this.context.save();
        this.context.fillStyle = 'rgba(' + this.grid.join(',') + ')';
        this.context.strokeStyle = 'rgba(' + this.grid.join(',') + ')';
        this.context.beginPath();

        for (let x = 0; x <= bw; x += 40) {
            this.context.moveTo(x + this.position, c);
            this.context.lineTo(x + this.position, bh + c);
        }

        this.context.closePath();
        this.context.stroke();
        this.context.fill();
        this.context.restore();

        /* Horizontal Lines */
        this.context.save();
        this.context.fillStyle = 'rgba(' + this.grid.join(',') + ')';
        this.context.strokeStyle = 'rgba(' + this.grid.join(',') + ')';
        this.context.beginPath();

        for (let x = 0; x <= bh + d; x += (15 + d)) {
            this.context.moveTo(this.position, x + c);
            this.context.lineTo(bw + this.position, +x + c);
        }
        this.context.closePath();
        this.context.fill();
        this.context.stroke();
        this.context.restore();

        /* Data */
        this.context.save();
        this.context.beginPath();

        for (let i = 1; i < this.data.length; i++) {
            const height = (this.canvas.height * this.data[i]) / 100;
            const width = 40 + c + d;
            const x = this.canvas.width - (i * width);
            const y = this.canvas.height - height;

            this.context.fillStyle = 'rgba(' + this.colors[i].join(',') + ')';
            this.context.strokeStyle = 'rgba(' + this.colors[i].join(',') + ')';
            this.context.fillRect(x, y, width, height);
        }

        this.context.closePath();
        this.context.restore();

        window.requestAnimationFrame(this.draw.bind(this));
    };

    this.render = function render(interval) {
        this.element.appendChild(this.canvas);

        setInterval(function () {
            if (this.stopped) {
                return;
            }

            this.position -= 5;
        }.bind(this), interval);

        this.draw();
    };

    this.__constructor.apply(this, arguments);
});