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

function Animation1() {
    this.options = {
        animating: false,
        count: 1,
        maxCount: 25,
        randomizeRadius: true,
        randomizeRotation: true,
        showMovementCircle: false,
        // showVisionGrid: false,
        speed: 4
    };

    this.container = document.getElementById('animation1');
    this.bounds = this.container.getBoundingClientRect();
    this.movementCircleCtrl = createMovementCircleControl();
    this.particles = [];

    const controls = new Controls(
        document.getElementById('controls1'),
        this.options,
        [this.movementCircleCtrl]
    );
    const eventStack = controls.mount()
        .merge(Rx.Observable.fromEvent(this.movementCircleCtrl, 'change')
            .map(evt => ({ key: CONTROLS.MOVEMENT_CIRCLE, value: evt.target.checked }))
        );

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

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

    // TODO particle starts offscreen sometimes

    // TODO ANIM2 Max out to 1000 or 2000 particles

    // TODO ANIM3 Show vision grid (including touches!)
    // TODO ANIM3 regen vision grid is option updated
    // TODO ANIM3 cleanup vision grid

    // TODO ANIM4 Pallet avoidance

    // TODO ANIM5 Flocking
};

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;
}

Animation1.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.RADIUS: this.updateRadius(value); break;
        case CONTROLS.ROTATION: this.updateRotation(value); break;
        case CONTROLS.SPEED: this.updateSpeed(value); break;
    }
}

Animation1.prototype.nextFrame = function() {
    this.particles.forEach(p => p.nextFrame());
}

Animation1.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));
    }
}

Animation1.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);
    }
}

Animation1.prototype.updateMovementCircle = function(showMovementCircle) {
    this.options.showMovementCircle = showMovementCircle;
    this.movementCircleCtrl.querySelector('[type=checkbox]').checked = showMovementCircle;
    this.particles.forEach(p => p.updateOptions({ showMovementCircle }));
}

Animation1.prototype.updateRadius = function(randomizeRadius) {
    this.options.randomizeRadius = randomizeRadius;
    this.particles.forEach(p => p.updateOptions({ randomizeRadius }));
}

Animation1.prototype.updateRotation = function(randomizeRotation) {
    this.options.randomizeRotation = randomizeRotation;
    this.particles.forEach(p => p.updateOptions({ randomizeRotation }));
}

Animation1.prototype.updateSpeed = function(speed) {
    this.options.speed = speed;
    this.particles.forEach(p => p.updateOptions({ speed }));
}

export default Animation1;