body { margin: 0; }
canvas { width: 100%; height: 100% }

init();
function init() {
    var stats = initStats();
    var scene = new THREE.Scene();
    var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 100);
    var renderer = new THREE.WebGLRenderer();
    renderer.setClearColor(new THREE.Color(0x000000));
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.shadowMap.enabled = true;
    var planeGeometry = new THREE.PlaneGeometry(60, 40, 1, 1);
    var planeMaterial = new THREE.MeshLambertMaterial({
        color: 0xffffff
    });
    var plane = new THREE.Mesh(planeGeometry, planeMaterial);
    plane.receiveShadow = true;
    plane.rotation.x = -0.5 * Math.PI;
    plane.position.x = 0;
    plane.position.y = 0;
    plane.position.z = 0;
    scene.add(plane);

    camera.position.x = -30;
    camera.position.y = 40;
    camera.position.z = 30;
    camera.lookAt(scene.position);

    var ambientLight = new THREE.AmbientLight(0x3c3c3c);
    scene.add(ambientLight);
  
    scene.fog = new THREE.Fog( 0xffffff, 0.015, 100 );

    var spotLight = new THREE.SpotLight(0xffffff, 1.2, 150, 120);
    spotLight.position.set(-40, 60, -10);
    spotLight.castShadow = true;
    scene.add(spotLight);
    scene.overrideMaterial = new THREE.MeshLambertMaterial({color: 0xffffff});
    document.getElementById("webgl-output").appendChild(renderer.domElement);

    var step = 0;

    var controls = new function () {
        this.rotationSpeed = 0.02;
        this.numberOfObjects = scene.children.length;

        this.removeCube = function () {
            var allChildren = scene.children;
            var lastObject = allChildren[allChildren.length - 1];
            if (lastObject instanceof THREE.Mesh) {
                scene.remove(lastObject);
                this.numberOfObjects = scene.children.length;
            }
        };

        this.addCube = function () {

            var cubeSize = Math.ceil((Math.random() * 3));
            var cubeGeometry = new THREE.BoxGeometry(cubeSize, cubeSize, cubeSize);
            var cubeMaterial = new THREE.MeshLambertMaterial({
                color: Math.random() * 0xffffff
            });
            var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
            cube.castShadow = true;
            cube.name = "cube-" + scene.children.length;


            // position the cube randomly in the scene

            cube.position.x = -30 + Math.round((Math.random() * planeGeometry.parameters.width));
            cube.position.y = Math.round((Math.random() * 5));
            cube.position.z = -20 + Math.round((Math.random() * planeGeometry.parameters.height));

            // add the cube to the scene
            scene.add(cube);
            this.numberOfObjects = scene.children.length;
        };

        this.outputObjects = function () {
            console.log(scene.children);
        }
    };
  
  //Thêm vài hình mẫu
    controls.addCube();
    controls.addCube();
    controls.addCube();
    controls.addCube();
    controls.addCube();
    controls.addCube();
    controls.addCube();
    controls.addCube();
  
  
    var gui = new dat.GUI();
    gui.add(controls, 'rotationSpeed', 0, 0.5);
    gui.add(controls, 'addCube');
    gui.add(controls, 'removeCube');
    gui.add(controls, 'outputObjects');
    gui.add(controls, 'numberOfObjects').listen();

    var trackballControls = initTrackballControls(camera, renderer);
    var clock = new THREE.Clock();

    render();
    
    function render() {

        trackballControls.update(clock.getDelta());
        stats.update();

        //Quay các hình vuông
        scene.traverse(function (e) {
            if (e instanceof THREE.Mesh && e != plane) {
                e.rotation.x += controls.rotationSpeed;
                e.rotation.y += controls.rotationSpeed;
                e.rotation.z += controls.rotationSpeed;
            }
        });

        // render using requestAnimationFrame
        requestAnimationFrame(render);
        renderer.render(scene, camera);
    }
}