import { Ray } from '../math/Ray.js';
import { Layers } from './Layers.js';

class Raycaster {
	constructor(origin, direction, near = 0, far = Infinity) {
		this.ray = new Ray(origin, direction);
		// direction is assumed to be normalized (for accurate distance calculations)

		this.near = near;
		this.far = far;
		this.camera = null;
		this.layers = new Layers();

		this.params = {
			Mesh: {},
			Line: { threshold: 1 },
			LOD: {},
			Points: { threshold: 1 },
			Sprite: {},
		};
	}

	set(origin, direction) {
		// direction is assumed to be normalized (for accurate distance calculations)

		this.ray.set(origin, direction);
	}

	setFromCamera(coords, camera) {
		if (camera && camera.isPerspectiveCamera) {
			this.ray.origin.setFromMatrixPosition(camera.matrixWorld);
			this.ray.direction.set(coords.x, coords.y, 0.5).unproject(camera).sub(this.ray.origin).normalize();
			this.camera = camera;
		} else if (camera && camera.isOrthographicCamera) {
			this.ray.origin.set(coords.x, coords.y, (camera.near + camera.far) / (camera.near - camera.far)).unproject(camera); // set origin in plane of camera
			this.ray.direction.set(0, 0, -1).transformDirection(camera.matrixWorld);
			this.camera = camera;
		} else {
			console.error('THREE.Raycaster: Unsupported camera type: ' + camera.type);
		}
	}

	intersectObject(object, recursive = true, intersects = []) {
		intersectObject(object, this, intersects, recursive);

		intersects.sort(ascSort);

		return intersects;
	}

	intersectObjects(objects, recursive = true, intersects = []) {
		for (let i = 0, l = objects.length; i < l; i++) {
			intersectObject(objects[i], this, intersects, recursive);
		}

		intersects.sort(ascSort);

		return intersects;
	}
}

function ascSort(a, b) {
	return a.distance - b.distance;
}

function intersectObject(object, raycaster, intersects, recursive) {
	if (object.layers.test(raycaster.layers)) {
		object.raycast(raycaster, intersects);
	}

	if (recursive === true) {
		const children = object.children;

		for (let i = 0, l = children.length; i < l; i++) {
			intersectObject(children[i], raycaster, intersects, true);
		}
	}
}

export { Raycaster };