/* @license
 * Copyright 2020 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the 'License');
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {Texture as ThreeTexture} from 'three';

import {GLTF, Texture as GLTFTexture} from '../../three-components/gltf-instance/gltf-2.0.js';

import {Texture as TextureInterface} from './api.js';
import {Image} from './image.js';
import {Sampler} from './sampler.js';
import {$sourceObject, ThreeDOMElement} from './three-dom-element.js';


const $source = Symbol('source');
const $sampler = Symbol('sampler');

/**
 * Material facade implementation for Three.js materials
 */
export class Texture extends ThreeDOMElement implements TextureInterface {
  private[$source]: Image;
  private[$sampler]: Sampler;

  constructor(
      onUpdate: () => void, gltf: GLTF, texture: GLTFTexture,
      correlatedTextures: Set<ThreeTexture>) {
    super(onUpdate, texture, correlatedTextures);

    const {sampler: samplerIndex, source: imageIndex} = texture;

    const sampler = (gltf.samplers != null && samplerIndex != null) ?
        gltf.samplers[samplerIndex] :
        {};
    this[$sampler] = new Sampler(onUpdate, sampler, correlatedTextures);

    if (gltf.images != null && imageIndex != null) {
      const image = gltf.images[imageIndex];

      if (image != null) {
        this[$source] = new Image(onUpdate, image, correlatedTextures);
      }
    }
  }

  get name(): string {
    return (this[$sourceObject] as any).name || '';
  }

  get sampler(): Sampler {
    return this[$sampler];
  }

  get source(): Image {
    return this[$source];
  }
}