import { BoundingBox } from '../../shape/bounding-box.js';

/**

* @class

* @name Batch

* @classdesc Holds information about batched mesh instances. Created in {@link BatchManager#create}.

* @param {MeshInstance[]} meshInstances - The mesh instances to be batched.

* @param {boolean} dynamic - Whether this batch is dynamic (supports transforming mesh instances at runtime).

* @param {number} batchGroupId - Link this batch to a specific batch group. This is done automatically with default batches.

* @property {MeshInstance[]} origMeshInstances An array of original mesh instances, from which this batch was generated.

* @property {MeshInstance} meshInstance A single combined mesh instance, the result of batching.

* @property {boolean} dynamic Whether this batch is dynamic (supports transforming mesh instances at runtime).

* @property {number} [batchGroupId] Link this batch to a specific batch group. This is done automatically with default batches.

*/

class Batch {

constructor(meshInstances, dynamic, batchGroupId) {

this.origMeshInstances = meshInstances;

this._aabb = new BoundingBox();

this.meshInstance = null;

this.dynamic = dynamic;

this.batchGroupId = batchGroupId;

}

// Removes the batch meshes from all layers and destroys it

destroy(scene, layers) {

if (this.meshInstance) {

this.removeFromLayers(scene, layers);

this.meshInstance.destroy();

}

}

addToLayers(scene, layers) {

for (let i = 0; i < layers.length; i++) {

const layer = scene.layers.getLayerById(layers[i]);

if (layer) {

layer.addMeshInstances([this.meshInstance]);

}

}

}

removeFromLayers(scene, layers) {

for (let i = 0; i < layers.length; i++) {

const layer = scene.layers.getLayerById(layers[i]);

if (layer) {

layer.removeMeshInstances([this.meshInstance]);

}

}

}

// Updates bounding box for a batch

updateBoundingBox() {

this._aabb.copy(this.origMeshInstances[0].aabb);

for (let i = 1; i < this.origMeshInstances.length; i++) {

this._aabb.add(this.origMeshInstances[i].aabb);

}

this.meshInstance.aabb = this._aabb;

this.meshInstance._aabbVer = 0;

}

}

export { Batch };