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

function Animation2() {
    this.options = {
        animating: false,
        count: 1,
        maxCount: 2000,
        speed: 4
    };

    this.container = document.getElementById('animation2');
    this.bounds = this.container.getBoundingClientRect();

    this.particles = [];

    const controls = new Controls(
        document.getElementById('controls2'),
        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 ANIM3 Show vision grid (including touches!)
    // TODO ANIM3 regen vision grid is option updated
    // TODO ANIM3 cleanup vision grid
    // TODO ANIM3 Pallet avoidance

    // TODO ANIM4 Flocking
};

Animation2.prototype.subscriber = function({ key, value }) {
    switch(key) {
        case CONTROLS.ANIMATING: this.updateAnimating(value); break;
        case CONTROLS.COUNT: this.updateCount(value); break;
        case CONTROLS.RADIUS: this.updateRadius(value); break;
        case CONTROLS.ROTATION: this.updateRotation(value); break;
        case CONTROLS.SPEED: this.updateSpeed(value); break;
    }
}

Animation2.prototype.nextFrame = function() {
    this.particles.forEach(p => p.nextFrame());
}

Animation2.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));
    }
}

Animation2.prototype.updateCount = function(count) {
    while (this.particles.length >= count) {
        const p = this.particles.pop();
        this.container.removeChild(p.node);
    }

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

Animation2.prototype.updateRadius = function(value) {
    this.particles.forEach(p => p.updateOptions({ randomizeRadius: value }));
}

Animation2.prototype.updateRotation = function(value) {
    this.particles.forEach(p => p.updateOptions({ randomizeRotation: value }));
}

Animation2.prototype.updateSpeed = function(speed) {
    this.particles.forEach(p => p.updateOptions({ speed }));
}

export default Animation2;