import * as THREE from 'three';

import { DDSLoader } from 'three/examples/jsm/loaders/DDSLoader';
import { MTLLoader } from 'three/examples/jsm/loaders/MTLLoader';
import { OBJLoader } from 'three/examples/jsm/loaders/OBJLoader';

let camera: THREE.PerspectiveCamera;
let scene: THREE.Scene;
let renderer: THREE.WebGLRenderer;

let mouseX = 0;
let mouseY = 0;

let windowHalfX = window.innerWidth / 2;
let windowHalfY = window.innerHeight / 2;

init();
animate();

function init() {
    const container = document.createElement('div');
    document.body.appendChild(container);

    camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 2000);
    camera.position.z = 250;

    // scene

    scene = new THREE.Scene();

    const ambientLight = new THREE.AmbientLight(0xcccccc, 0.4);
    scene.add(ambientLight);

    const pointLight = new THREE.PointLight(0xffffff, 0.8);
    camera.add(pointLight);
    scene.add(camera);

    // model

    const onProgress = (xhr: ProgressEvent) => {
        if (xhr.lengthComputable) {
            const percentComplete = (xhr.loaded / xhr.total) * 100;
            console.log(Math.round(percentComplete) + '% downloaded');
        }
    };

    const onError = () => {};

    const manager = new THREE.LoadingManager();
    manager.addHandler(/\.dds$/i, new DDSLoader());

    // comment in the following line and import TGALoader if your asset uses TGA textures
    // manager.addHandler( /\.tga$/i, new TGALoader() );

    new MTLLoader(manager).setPath('models/obj/male02/').load('male02_dds.mtl', materials => {
        materials.preload();

        new OBJLoader(manager)
            .setMaterials(materials)
            .setPath('models/obj/male02/')
            .load(
                'male02.obj',
                object => {
                    object.position.y = -95;
                    scene.add(object);
                },
                onProgress,
                onError,
            );
    });

    //

    renderer = new THREE.WebGLRenderer();
    renderer.setPixelRatio(window.devicePixelRatio);
    renderer.setSize(window.innerWidth, window.innerHeight);
    container.appendChild(renderer.domElement);

    document.addEventListener('mousemove', onDocumentMouseMove);

    //

    window.addEventListener('resize', onWindowResize);
}

function onWindowResize() {
    windowHalfX = window.innerWidth / 2;
    windowHalfY = window.innerHeight / 2;

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();

    renderer.setSize(window.innerWidth, window.innerHeight);
}

function onDocumentMouseMove(event: MouseEvent) {
    mouseX = (event.clientX - windowHalfX) / 2;
    mouseY = (event.clientY - windowHalfY) / 2;
}

//

function animate() {
    requestAnimationFrame(animate);
    render();
}

function render() {
    camera.position.x += (mouseX - camera.position.x) * 0.05;
    camera.position.y += (-mouseY - camera.position.y) * 0.05;

    camera.lookAt(scene.position);

    renderer.render(scene, camera);
}