import Rx, { Observable } from 'rxjs';
import { CONTROLS } from './enums';

export default function(destroy$, {
    count = 1,
    id,
    maxCount = 10,
    showCircleControl = false,
    showRandomizeControl = false
}) {
    const container = document.createElement('div');
    container.className = 'controlsContainer';
    container.id = `controls${id}`;
    document.getElementById(id).appendChild(container);

    const observables = {
        count$: createCountControl(container, 0, maxCount),
        speed$: createSpeedControl(container),
        circle$: showCircleControl ? createCircleControl(container) : undefined,
        randomize$: showRandomizeControl ? createRandomizeControl(container) : undefined,
        animating$: createAnimatingControl(container),
    };

    observables.animating$.subscribe((isAnimating) => {
        if (isAnimating === true) {
            destroy$.next(id);

            if (observables.count$.getValue() === 0) {
                observables.count$.next(count);
            }
        }
    });

    destroy$.subscribe((sourceId) => {
        if (id !== sourceId) {
            observables.animating$.next(false);
            observables.count$.next(0);
        }
    });

    return observables;
}


function createAnimatingControl(container) {
    const label = document.createElement('label');
    label.className = 'controls-label';
    label.className = 'controls-animating';

    const text = document.createElement('span');

    const checkbox = document.createElement('input');
    checkbox.type = 'checkbox';
    checkbox.checked = false;

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

    container.appendChild(label);

    const animating$ = new Rx.BehaviorSubject(false);

    label.addEventListener('change', (evt) => {
        animating$.next(evt.target.checked);
    });

    animating$.subscribe((isAnimating) => {
        text.innerHTML = (isAnimating ? '◼ Stop' : '▶ Start');
        checkbox.checked = isAnimating;
    });

    return animating$;
}

function createCountControl(container, initialValue, max) {
    const label = document.createElement('label');
    label.className = 'controls-range';

    const text = document.createElement('span');
    text.innerHTML = (initialValue == 1) ? '1 particle' : `${initialValue} particles`;
    text.className = 'controls-range-text';

    const slider = document.createElement('input');
    slider.type = 'range';
    slider.min = 1;
    slider.max = max;
    slider.value = initialValue;
    slider.className = 'controls-range-input';

    label.appendChild(text);
    label.appendChild(slider);

    container.appendChild(label);

    const count$ = new Rx.BehaviorSubject(initialValue);

    label.addEventListener('input', (evt) => {
        count$.next(evt.target.value * 1);
    });

    count$.subscribe((value) => {
        text.innerHTML = (value == 1) ? '1 particle' : `${value} particles`;
    });

    return count$;
}

function createSpeedControl(container) {
    const label = document.createElement('label');
    label.className = 'controls-range';

    const text = document.createElement('span');
    text.className = 'controls-range-text';
    text.innerHTML = 'Speed: 0';

    const slider = document.createElement('input');
    slider.type = 'range';
    slider.min = 1;
    slider.max = 15;
    slider.value = 4;
    slider.className = 'controls-range-input';

    label.appendChild(text);
    label.appendChild(slider);

    container.appendChild(label);

    const speed$ = new Rx.BehaviorSubject(slider.value);

    label.addEventListener('input', (evt) => {
        speed$.next(evt.target.value * 1);
    });

    speed$.subscribe((value) => {
        text.innerHTML = `Speed: ${value}`;
    });

    return speed$;
}

function createCircleControl(container) {
    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';
    checkbox.checked = true;

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

    container.appendChild(label);

    const circle$ = Rx.Observable.fromEvent(label, 'change')
        .map(evt => evt.target.checked);

    return circle$;
}

function createRandomizeControl(container) {
    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 = true;

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

    container.appendChild(label);

    const circle$ = Rx.Observable.fromEvent(label, 'change')
        .map(evt => evt.target.checked);

    return randomize$;
}