// Babylon.js 场景管理器
class BabylonSceneManager {
    constructor(canvasId) {
        this.canvas = document.getElementById(canvasId);
        this.engine = new BABYLON.Engine(this.canvas, true);
        this.scene = null;
        this.camera = null;
        this.onModelLoaded = null;
    }

    init() {
        this.scene = new BABYLON.Scene(this.engine);
        this.scene.clearColor = new BABYLON.Color3(0.1, 0.1, 0.1);

        this.camera = new BABYLON.ArcRotateCamera(
            "camera",
            0,
            Math.PI / 2,
            2,
            new BABYLON.Vector3(0, 1.5, 0),
            this.scene
        );
        this.camera.attachControl(this.canvas, true);
        this.camera.minZ = 0.01;
        this.camera.lowerRadiusLimit = 1;
        this.camera.upperRadiusLimit = 5;

        this.scene.createDefaultEnvironment();

        this.engine.runRenderLoop(() => {
            this.scene.render();
        });

        window.addEventListener('resize', () => {
            this.engine.resize();
        });
    }

    loadModel(modelPath, onSuccess, onError) {
        BABYLON.SceneLoader.ImportMesh("", "./", modelPath, this.scene,
            (meshes) => {
                this.scene.lights.forEach(light => {
                    light.intensity = 50;
                });

                if (onSuccess) {
                    onSuccess(meshes);
                }
            },
            null,
            (scene, message) => {
                if (onError) {
                    onError(message);
                }
            }
        );
    }
}

// 导出到全局
if (typeof window !== 'undefined') {
    window.BabylonSceneManager = BabylonSceneManager;
}