package com.dgzt.gltfexample;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.g3d.utils.CameraInputController;
import com.badlogic.gdx.graphics.g3d.utils.DefaultShaderProvider;
import com.badlogic.gdx.graphics.g3d.utils.DepthShaderProvider;
import net.mgsx.gltf.loaders.gltf.GLTFAssetLoader;
import net.mgsx.gltf.scene3d.lights.DirectionalLightEx;
import net.mgsx.gltf.scene3d.scene.Scene;
import net.mgsx.gltf.scene3d.scene.SceneAsset;
import net.mgsx.gltf.scene3d.scene.SceneManager;

public class GltfExample extends ApplicationAdapter {

    private static final String MODEL_SOLDIER_PATH = "uploads_files_2584113_droid.gltf";

    private AssetManager assetManager;

    private SceneManager sceneManager;
    private SceneAsset soldierSceneAsset;
    private Scene scene;
    private PerspectiveCamera camera;
    private DirectionalLightEx light;

    public CameraInputController inputController;

    @Override
    public void create () {
        assetManager = new AssetManager();
        assetManager.setLoader(SceneAsset.class, new GLTFAssetLoader());
        assetManager.load(MODEL_SOLDIER_PATH, SceneAsset.class);
        assetManager.finishLoading();
        soldierSceneAsset = assetManager.get(MODEL_SOLDIER_PATH);

        // create scene
        scene = new Scene(soldierSceneAsset.scene);

        sceneManager = new SceneManager(new DefaultShaderProvider(), new DepthShaderProvider());
        sceneManager.addScene(scene);

        // setup camera
        camera = new PerspectiveCamera(67f, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        camera.position.set(15, 15, 15);
        camera.lookAt(0, 0, 0);
        camera.update();
        sceneManager.setCamera(camera);

        // setup light
        light = new DirectionalLightEx();
        light.direction.set(1, -3, 1).nor();
        light.color.set(Color.RED);
        sceneManager.environment.add(light);

        Gdx.input.setInputProcessor(inputController = new CameraInputController(camera));
    }

    @Override
    public void resize(int width, int height) {
        sceneManager.updateViewport(width, height);
    }

    @Override
    public void render () {
        float deltaTime = Gdx.graphics.getDeltaTime();

        inputController.update();

        // render
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);
        sceneManager.update(deltaTime);
        sceneManager.render();
    }

    @Override
    public void dispose () {
        sceneManager.dispose();
        soldierSceneAsset.dispose();
    }
}