import Rx, { Observable } from 'rxjs';
import Grid from './grid';
import Particle from './particle';
import Controls from './controls';
import { CONTROLS } from './enums';

function Animation1a() {
    this.options = {
        count: 1,
        maxCount: 10,
        randomize: true,
        showMovementCircle: true,
        speed: 4
    };

    this.container = document.getElementById('animation1a');
    this.particles = [];
    this.grid = new Grid();

    this.movementCircleCtrl = createMovementCircleControl();
    this.randomizeCtrl = createRandomizeControl();

    const controls = new Controls(
        document.getElementById('controls1a'),
        this.options,
        [this.movementCircleCtrl, this.randomizeCtrl]
    );

    const circle$ = Rx.Observable.fromEvent(this.movementCircleCtrl, 'change')
        .map(evt => ({ key: CONTROLS.MOVEMENT_CIRCLE, value: evt.target.checked }));

    const randomize$ = Rx.Observable.fromEvent(this.randomizeCtrl, 'change')
        .map(evt => ({ key: CONTROLS.RANDOMIZE, value: evt.target.checked }));

    const eventStack$ = controls.mount().merge(circle$, randomize$);

    eventStack$.subscribe(this.subscriber.bind(this));

    this.updateCount(this.options.count);
    this.updateMovementCircle(this.options.showMovementCircle);
    this.updateRandomize(this.options.randomize);
};

function createMovementCircleControl() {
    const label = document.createElement('label');
    label.className = 'controls-checkbox';

    const text = document.createElement('span');
    text.innerHTML = 'Show movement circle';
    text.className = 'controls-checkbox-text';

    const checkbox = document.createElement('input');
    checkbox.type = 'checkbox';
    checkbox.className = 'controls-checkbox-input';

    label.appendChild(checkbox);
    label.appendChild(text);

    return label;
}

function createRandomizeControl(value) {
    const label = document.createElement('label');
    label.className = 'controls-checkbox';

    const text = document.createElement('span');
    text.innerHTML = 'Randomize movement';
    text.className = 'controls-checkbox-text';

    const checkbox = document.createElement('input');
    checkbox.type = 'checkbox';
    checkbox.className = 'controls-checkbox-input';
    checkbox.checked = value;

    label.appendChild(checkbox);
    label.appendChild(text);

    return label;
}

Animation1a.prototype.subscriber = function({ key, value }) {
    switch(key) {
        case CONTROLS.ANIMATING: this.updateAnimating(value); break;
        case CONTROLS.COUNT: this.updateCount(value); break;
        case CONTROLS.MOVEMENT_CIRCLE: this.updateMovementCircle(value); break;
        case CONTROLS.RANDOMIZE: this.updateRandomize(value); break;
        case CONTROLS.SPEED: this.updateSpeed(value); break;
    }
}

Animation1a.prototype.nextFrame = function() {
    this.particles.forEach(p => p.nextFrame());
}

Animation1a.prototype.updateAnimating = function(isAnimating) {
    this.options.animating = isAnimating;

    if (isAnimating) {
        const fps$ = Rx.Observable.interval(1000 / 32)
            .takeWhile(_ => this.options.animating);

        fps$.subscribe(this.nextFrame.bind(this));
    }
}

Animation1a.prototype.updateCount = function(count) {
    const bounds = this.container.getBoundingClientRect();

    while (this.particles.length > count) {
        delete this.particles.pop().remove();
    }

    while (this.particles.length < count) {
        const p = new Particle(this.container, bounds, this.options, this.grid);
        this.particles.push(p);
    }
}

Animation1a.prototype.updateMovementCircle = function(value) {
    this.options.showMovementCircle = value;
    this.movementCircleCtrl.querySelector('[type=checkbox]').checked = value;
    this.particles.forEach(p => p.updateConfig({ showMovementCircle: value }));
}

Animation1a.prototype.updateRandomize = function(value) {
    this.options.randomize = value;
    this.randomizeCtrl.querySelector('[type=checkbox]').checked = value;
    this.particles.forEach(p => p.updateConfig({ randomize: value }));
}

Animation1a.prototype.updateSpeed = function(value) {
    this.options.speed = value;
    this.particles.forEach(p => p.updateConfig({ speed: value }));
}

export default Animation1a;