import {Proton} from './proton';

import {Vector} from '@avocado/math';

export class TextNode {

  constructor(text) {
    const div = window.document.createElement('div');
    div.className = 'particle';
    div.style.position = 'absolute';
    const span = window.document.createElement('span');
    span.className = 'text';
    span.textContent = text;
    this.span = span;
    div.appendChild(span);
    this.div = div;
  }

  clone() {
    const clone = new TextNode();
    clone.div = this.div.cloneNode(true);
    clone.span = clone.div.children[0];
    return clone;
  }

  update(particle, stage) {
    const {div, span} = this;
    const alpha = particle.useAlpha ? particle.alpha : 1;
    const color = particle.useColor ? particle.color : {r: 0, g: 0, b: 0};
    const {rotation, scale} = particle;
    div.style.color = `rgb(
      ${color.r * 255},
      ${color.g * 255},
      ${color.b * 255}
    )`;
    div.style.opacity = alpha;
    const camera = stage.camera;
    const position = [particle.p.x, particle.p.y];
    if (camera) {
      const realOffset = camera.realOffset;
      position[0] -= realOffset[0];
      position[1] += realOffset[1];
    }
    const angle = rotation.x / (Math.PI * 2);
    const distanceScale = particle.p.z > 0 ? particle.p.z / 70 : 0;
    div.style.transform = `
      translate(${position[0]}px, ${-position[1]}px)
      rotate(${angle * 360}deg)
      scale(${scale + distanceScale})
    `;
    const spanTranslate = 50 * (1 / scale);
    span.style.transform = `translate(-${spanTranslate}%, -${spanTranslate}%)`;
  }

}

export class TextNodeRenderer extends Proton.BaseRender {

  constructor(selector, stage) {
    super();
    this._body = new TextNode('');
    this.name = 'NodeRenderer';
    this._nodePool = new Proton.Pool();
    this.queued = [];
    this.stage = stage;
    const promise = stage.findUiElement(selector);
    promise.then((element) => {
      this.parent = element;
    });
  }

  onParticleCreated(particle) {
    if (!particle.body) {
      particle.body = this._body;
    }
    particle.target = this._nodePool.get(particle.body);
    particle.target.div.style.opacity = 0;
    if (!this.parent) {
      this.queued.push(particle.target.div);
    }
    else {
      for (let i = 0; i < this.queued.length; ++i) {
        this.parent.appendChild(this.queued[i]);
      }
      this.parent.appendChild(particle.target.div);
    }
  }

  onParticleUpdate(particle) {
    if (!particle.target) {
      return;
    }
    particle.target.update(particle, this.stage);
  }

  onParticleDead(particle) {
    this._nodePool.expire(particle.target);
    this.parent.removeChild(particle.target.div);
    particle.target = undefined;
  }

}