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

function Animation2a() {
    this.options = {
        count: 1,
        maxCount: 10,
        randomize: true,
        showVisionGrid: true,
        showMovementCircle: false,
        speed: 4
    };

    this.container = document.getElementById('animation2a');
    this.bounds = this.container.getBoundingClientRect();

    this.particles = [];

    const controls = new Controls(
        document.getElementById('controls2a'),
        this.options
    );

    controls.mount().subscribe(this.subscriber.bind(this));

    this.updateAnimating(this.options.animating);
    this.updateCount(this.options.count);

    // TODO X dimension modified by core UI
    // TODO remove bottom padding from Disqus
    // TODO perf - cache trig or perform operations
    // TODO move animating into controls
    // TODO particle evade

    // TODO ANIM2 put pallettes in animation
    // TODO ANIM2a Show vision grid (including touches!)
    // TODO ANIM2b Scale vision grid to 1000? particles

    // TODO ANIM4 Pallet avoidance
    // TODO ANIM4 Lots of particles

    // TODO ANIM5 Flocking
};

Animation2a.prototype.subscriber = function({ key, value }) {
    switch(key) {
        case CONTROLS.ANIMATING: this.updateAnimating(value); break;
        case CONTROLS.COUNT: this.updateCount(value); break;
        case CONTROLS.RANDOMIZE: this.updateRandomize(value); break;
        case CONTROLS.SPEED: this.updateSpeed(value); break;
    }
}

Animation2a.prototype.nextFrame = function() {
    this.particles.forEach(p => p.nextFrame());
}

Animation2a.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));
    }
}

Animation2a.prototype.updateCount = function(count) {
    while (this.particles.length >= count) {
        delete this.particles.pop().remove();
    }

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

Animation2a.prototype.updateRandomize = function(value) {
    this.options.randomize = value;
    this.particles.forEach(p => p.updateOptions({ randomize: value }));
}

Animation2a.prototype.updateSpeed = function(value) {
    this.options.speed = value;
    this.particles.forEach(p => p.updateOptions({ speed: value }));
}

export default Animation2a;