import { Object3D } from '../core/Object3D.js';
import { Vector3 } from '../math/Vector3.js';
import { PerspectiveCamera } from './PerspectiveCamera.js';

const fov = 90,
	aspect = 1;

class CubeCamera extends Object3D {
	constructor(near, far, renderTarget) {
		super();

		this.type = 'CubeCamera';

		if (renderTarget.isWebGLCubeRenderTarget !== true) {
			console.error('THREE.CubeCamera: The constructor now expects an instance of WebGLCubeRenderTarget as third parameter.');
			return;
		}

		this.renderTarget = renderTarget;

		const cameraPX = new PerspectiveCamera(fov, aspect, near, far);
		cameraPX.layers = this.layers;
		cameraPX.up.set(0, -1, 0);
		cameraPX.lookAt(new Vector3(1, 0, 0));
		this.add(cameraPX);

		const cameraNX = new PerspectiveCamera(fov, aspect, near, far);
		cameraNX.layers = this.layers;
		cameraNX.up.set(0, -1, 0);
		cameraNX.lookAt(new Vector3(-1, 0, 0));
		this.add(cameraNX);

		const cameraPY = new PerspectiveCamera(fov, aspect, near, far);
		cameraPY.layers = this.layers;
		cameraPY.up.set(0, 0, 1);
		cameraPY.lookAt(new Vector3(0, 1, 0));
		this.add(cameraPY);

		const cameraNY = new PerspectiveCamera(fov, aspect, near, far);
		cameraNY.layers = this.layers;
		cameraNY.up.set(0, 0, -1);
		cameraNY.lookAt(new Vector3(0, -1, 0));
		this.add(cameraNY);

		const cameraPZ = new PerspectiveCamera(fov, aspect, near, far);
		cameraPZ.layers = this.layers;
		cameraPZ.up.set(0, -1, 0);
		cameraPZ.lookAt(new Vector3(0, 0, 1));
		this.add(cameraPZ);

		const cameraNZ = new PerspectiveCamera(fov, aspect, near, far);
		cameraNZ.layers = this.layers;
		cameraNZ.up.set(0, -1, 0);
		cameraNZ.lookAt(new Vector3(0, 0, -1));
		this.add(cameraNZ);
	}

	update(renderer, scene) {
		if (this.parent === null) this.updateMatrixWorld();

		const renderTarget = this.renderTarget;

		const [cameraPX, cameraNX, cameraPY, cameraNY, cameraPZ, cameraNZ] = this.children;

		const currentXrEnabled = renderer.xr.enabled;
		const currentRenderTarget = renderer.getRenderTarget();

		renderer.xr.enabled = false;

		const generateMipmaps = renderTarget.texture.generateMipmaps;

		renderTarget.texture.generateMipmaps = false;

		renderer.setRenderTarget(renderTarget, 0);
		renderer.render(scene, cameraPX);

		renderer.setRenderTarget(renderTarget, 1);
		renderer.render(scene, cameraNX);

		renderer.setRenderTarget(renderTarget, 2);
		renderer.render(scene, cameraPY);

		renderer.setRenderTarget(renderTarget, 3);
		renderer.render(scene, cameraNY);

		renderer.setRenderTarget(renderTarget, 4);
		renderer.render(scene, cameraPZ);

		renderTarget.texture.generateMipmaps = generateMipmaps;

		renderer.setRenderTarget(renderTarget, 5);
		renderer.render(scene, cameraNZ);

		renderer.setRenderTarget(currentRenderTarget);

		renderer.xr.enabled = currentXrEnabled;

		renderTarget.texture.needsPMREMUpdate = true;
	}
}

export { CubeCamera };