import { Render } from '../scene/render.js';

// The scope of this function is the render asset

function onContainerAssetLoaded(containerAsset) {

const renderAsset = this;

if (!renderAsset.resource) return;

const containerResource = containerAsset.resource;

const render = containerResource.renders && containerResource.renders[renderAsset.data.renderIndex];

if (render) {

renderAsset.resource.meshes = render.resource.meshes;

}

}

// The scope of this function is the render asset

function onContainerAssetAdded(containerAsset) {

const renderAsset = this;

renderAsset.registry.off('load:' + containerAsset.id, onContainerAssetLoaded, renderAsset);

renderAsset.registry.on('load:' + containerAsset.id, onContainerAssetLoaded, renderAsset);

renderAsset.registry.off('remove:' + containerAsset.id, onContainerAssetRemoved, renderAsset);

renderAsset.registry.once('remove:' + containerAsset.id, onContainerAssetRemoved, renderAsset);

if (!containerAsset.resource) {

renderAsset.registry.load(containerAsset);

} else {

onContainerAssetLoaded.call(renderAsset, containerAsset);

}

}

function onContainerAssetRemoved(containerAsset) {

const renderAsset = this;

renderAsset.registry.off('load:' + containerAsset.id, onContainerAssetLoaded, renderAsset);

if (renderAsset.resource) {

renderAsset.resource.destroy();

}

}

/**

* @class

* @name RenderHandler

* @implements {ResourceHandler}

* @classdesc Resource handler used for loading {@link Render} resources.

* @param {GraphicsDevice} device - The graphics device that will be rendering.

* @param {StandardMaterial} defaultMaterial - The shared default material that is used in any place that a material is not specified.

*/

class RenderHandler {

constructor(assets) {

this._registry = assets;

}

load(url, callback, asset) {

}

open(url, data) {

return new Render();

}

patch(asset, registry) {

if (!asset.data.containerAsset)

return;

const containerAsset = registry.get(asset.data.containerAsset);

if (!containerAsset) {

registry.once('add:' + asset.data.containerAsset, onContainerAssetAdded, asset);

return;

}

onContainerAssetAdded.call(asset, containerAsset);

}

}

export { RenderHandler };