import * as THREE from 'three';

const mouse = new THREE.Vector2();
const raycaster = new THREE.Raycaster();

class Selector {

	constructor( editor ) {

		const signals = editor.signals;

		this.editor = editor;
		this.signals = signals;

		// signals

		signals.intersectionsDetected.add( ( intersects ) => {

			if ( intersects.length > 0 ) {

				// Resolve helpers to their actual objects

				const objects = [];

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

					let object = intersects[ i ].object;

					if ( object.userData.object !== undefined ) {

						object = object.userData.object;

					}

					if ( objects.indexOf( object ) === - 1 ) {

						objects.push( object );

					}

				}

				// Cycle through objects if the first one is already selected

				const index = objects.indexOf( editor.selected );

				if ( index !== - 1 && index < objects.length - 1 ) {

					this.select( objects[ index + 1 ] );

				} else {

					this.select( objects[ 0 ] );

				}

			} else {

				this.select( null );

			}

		} );

	}

	getIntersects( raycaster ) {

		const objects = [];

		this.editor.scene.traverseVisible( function ( child ) {

			objects.push( child );

		} );

		this.editor.sceneHelpers.traverseVisible( function ( child ) {

			if ( child.name === 'picker' ) objects.push( child );

		} );

		return raycaster.intersectObjects( objects, false );

	}

	getPointerIntersects( point, camera ) {

		mouse.set( ( point.x * 2 ) - 1, - ( point.y * 2 ) + 1 );

		raycaster.setFromCamera( mouse, camera );

		return this.getIntersects( raycaster );

	}

	select( object ) {

		if ( this.editor.selected === object ) return;

		let uuid = null;

		if ( object !== null ) {

			uuid = object.uuid;

		}

		this.editor.selected = object;
		this.editor.config.setKey( 'selected', uuid );

		this.signals.objectSelected.dispatch( object );

	}

	deselect() {

		this.select( null );

	}

}

export { Selector };