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<!DOCTYPE html>
<html>
<head>
    <title>Hunyuan World Navigator</title>
    <style>
        body { 
            margin: 0; 
            font-family: Arial, sans-serif;
            background: #1a1a1a;
            color: white;
            text-align: center;
        }
        #header {
            padding: 20px;
            background: #282828;
            border-bottom: 1px solid #444;
        }
        #header h1 {
            margin: 0 0 10px 0;
            font-size: 2em;
        }
        #header p {
            margin: 0 0 20px 0;
            color: #ccc;
        }
        #header a {
            color: #61dafb;
            text-decoration: none;
        }
        #header a:hover {
            text-decoration: underline;
        }
        #examples-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            padding: 20px;
            gap: 20px;
            background: #222;
        }
        .example-card {
            background: #333;
            border-radius: 8px;
            overflow: hidden;
            width: 200px;
            cursor: pointer;
            transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        .example-card:hover {
            transform: scale(1.05);
            box-shadow: 0 8px 16px rgba(0,0,0,0.3);
        }
        .example-card img {
            width: 100%;
            height: 120px;
            object-fit: cover;
            display: block;
        }
        .example-card p {
            margin: 0;
            padding: 15px;
            font-weight: bold;
        }
        #viewer-container {
            position: relative;
            width: 100%;
            height: 65vh; /* Adjusted height for the viewer */
        }
        canvas { 
            display: block; 
            width: 100%;
            height: 100%;
        }
        #upload-container {
            margin-top: 15px;
        }
        #file-input {
            display: none;
        }
        .upload-btn {
            background: #4CAF50;
            color: white;
            padding: 10px 15px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }
        .upload-btn:hover {
            background: #45a049;
        }
        #loading {
            display: none;
            margin-top: 10px;
            color: #aaa;
            font-size: 18px;
        }
        #controls {
            position: absolute;
            top: 10px;
            left: 10px;
            z-index: 10;
        }
        .control-btn {
            padding: 8px 12px;
            margin-right: 5px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            background: rgba(85, 85, 85, 0.8);
            color: white;
        }
        .control-btn:hover {
            background: rgba(102, 102, 102, 0.9);
        }
        #instructions {
            position: absolute;
            bottom: 10px;
            left: 10px;
            color: white;
            background: rgba(0,0,0,0.5);
            padding: 10px;
            border-radius: 5px;
            font-size: 14px;
            z-index: 10;
        }
    </style>
</head>
<body>
    <div id="header">
        <h1>Hunyuan World Navigator</h1>
        <p>
            <a href="https://huggingface.co/tencent/HunyuanWorld-1" target="_blank" rel="noopener noreferrer">HunyuanWorld-1 on Hugging Face</a> | 
            <a href="https://github.com/camenduru/HunyuanWorld-1.0-jupyter" target="_blank" rel="noopener noreferrer">Generate your own on Google Colab</a>
        </p>
        <p>Click an example below or upload your own files to begin.</p>
        <div id="upload-container">
            <label for="file-input" class="upload-btn">Select Custom PLY/DRC Files</label>
            <input id="file-input" type="file" accept=".ply,.drc" multiple>
        </div>
    </div>
    
    <div id="examples-container">
        <!-- Examples will be dynamically inserted here -->
    </div>
    
    <div id="loading">Loading...</div>

    <div id="viewer-container">
        <div id="controls">
            <button id="rotate-toggle" class="control-btn">Pause Rotation</button>
            <button id="reset-view" class="control-btn">Reset View</button>
        </div>
        <div id="instructions">
            Controls: WASD to move, Mouse drag to look around
        </div>
        <!-- Canvas will be appended here by Three.js -->
    </div>


    <script src="https://cdn.jsdelivr.net/npm/[email protected]/build/three.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/loaders/PLYLoader.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/examples/js/loaders/DRACOLoader.js"></script>
    <script>
        // --- DATA FOR EXAMPLES ---
        const baseURL = 'https://huggingface.co/datasets/multimodalart/HunyuanWorld-panoramas/resolve/main/';

        const examplesData = [
            { name: 'Cyberpunk', previewImage: 'cyberpunk/cyberpunk.webp', files: ['cyberpunk/mesh_layer0.ply', 'cyberpunk/mesh_layer1.ply'] },
            { name: 'European Town', previewImage: 'european/european.webp', files: ['european/mesh_layer0.ply', 'european/mesh_layer1.ply'] },
            { name: 'Italian Village', previewImage: 'italian/italian.webp', files: ['italian/mesh_layer0.ply', 'italian/mesh_layer1.ply', 'italian/mesh_layer2.ply', 'italian/mesh_layer3.ply'] },
            { name: 'Mountain', previewImage: 'mountain/mountain.webp', files: ['mountain/mesh_layer0.ply', 'mountain/mesh_layer1.ply'] },
            { name: 'WXP', previewImage: 'wxp/wxp.webp', files: ['wxp/mesh_layer0.ply', 'wxp/mesh_layer1.ply', 'wxp/mesh_layer2.ply'] },
            { name: 'ZLD', previewImage: 'zld/zld.webp', files: ['zld/mesh_layer0.ply', 'zld/mesh_layer1.ply'] }
        ];
        
        // Prepend the base URL to all example file paths
        const examples = examplesData.map(ex => ({
            name: ex.name,
            previewImage: baseURL + ex.previewImage,
            files: ex.files.map(file => baseURL + file)
        }));

        // --- UI SETUP ---
        const examplesContainer = document.getElementById('examples-container');
        examples.forEach(example => {
            const card = document.createElement('div');
            card.className = 'example-card';
            card.innerHTML = `
                <img src="${example.previewImage}" alt="${example.name}">
                <p>${example.name}</p>
            `;
            card.addEventListener('click', () => loadExample(example));
            examplesContainer.appendChild(card);
        });

        // --- THREE.JS INITIALIZATION ---
        const viewerContainer = document.getElementById('viewer-container');
        const scene = new THREE.Scene();
        scene.background = new THREE.Color(0x222222);
        const camera = new THREE.PerspectiveCamera(75, viewerContainer.clientWidth / viewerContainer.clientHeight, 0.1, 1000);
        const renderer = new THREE.WebGLRenderer({ antialias: true });
        renderer.setSize(viewerContainer.clientWidth, viewerContainer.clientHeight);
        viewerContainer.appendChild(renderer.domElement);
        
        // --- LOADERS ---
        const plyLoader = new THREE.PLYLoader();
        const dracoLoader = new THREE.DRACOLoader();
        dracoLoader.setDecoderPath('https://cdn.jsdelivr.net/npm/[email protected]/examples/js/libs/draco/');
        
        // --- MOVEMENT & CONTROL VARIABLES ---
        const moveSpeed = 0.01;
        const maxDistance = 0.3;
        const keys = { w: false, a: false, s: false, d: false };
        let isMouseDown = false;
        let previousMousePosition = { x: 0, y: 0 };
        let isRotating = false; // Start paused
        let animationId = null;

        // --- SCENE HELPER FUNCTIONS ---
        function clearScene() {
            scene.children.slice().forEach(child => {
                if (child instanceof THREE.Mesh) {
                    if (child.geometry) child.geometry.dispose();
                    if (child.material) child.material.dispose();
                    scene.remove(child);
                }
            });
        }

        function onLoadingComplete() {
            document.getElementById('loading').style.display = 'none';
            positionCamera();
            isRotating = true;
            document.getElementById('rotate-toggle').textContent = 'Pause Rotation';
            if (!animationId) {
                animate();
            }
        }
        
        function positionCamera() {
            scene.rotation.y = 0;
            camera.position.set(0, 0, 0);
            camera.quaternion.set(0, 0, 0, 1); // Reset camera rotation
            camera.lookAt(0, 0, -10);
        }

        // --- LOADING LOGIC ---

        // Load pre-defined examples from server
        function loadExample(example) {
            document.getElementById('loading').style.display = 'block';
            clearScene();

            const promises = example.files.map(url => 
                fetch(url).then(res => {
                    if (!res.ok) throw new Error(`Failed to fetch ${url}`);
                    return res.arrayBuffer();
                })
            );

            Promise.all(promises)
                .then(buffers => {
                    buffers.forEach(buffer => {
                        const geometry = plyLoader.parse(buffer);
                        const material = new THREE.MeshBasicMaterial({
                            side: THREE.DoubleSide,
                            vertexColors: true,
                        });
                        const mesh = new THREE.Mesh(geometry, material);
                        mesh.rotateX(-Math.PI / 2);
                        mesh.rotateZ(-Math.PI / 2);
                        scene.add(mesh);
                    });
                    onLoadingComplete();
                })
                .catch(error => {
                    console.error('Error loading example:', error);
                    alert('Failed to load example files. Check console for details.');
                    document.getElementById('loading').style.display = 'none';
                });
        }

        // Load custom files from user's computer
        document.getElementById('file-input').addEventListener('change', function(e) {
            const files = e.target.files;
            if (files.length === 0) return;
            
            document.getElementById('loading').style.display = 'block';
            clearScene();
            
            let loadedCount = 0;
            const totalFiles = files.length;
            
            Array.from(files).forEach(file => {
                const reader = new FileReader();
                reader.onload = function(event) {
                    try {
                        let geometry;
                        if (file.name.endsWith('.ply')) {
                            geometry = plyLoader.parse(event.target.result);
                        } else if (file.name.endsWith('.drc')) {
                            dracoLoader.setDecoderConfig({ type: 'js' }); // Ensure decoder is set
                            dracoLoader.parse(event.target.result, (decodedGeometry) => {
                                geometry = decodedGeometry;
                                // Draco decoding is async, handle mesh creation inside callback
                                if (!geometry.attributes.normal) geometry.computeVertexNormals();
                                const material = new THREE.MeshBasicMaterial({ side: THREE.DoubleSide, vertexColors: true });
                                const mesh = new THREE.Mesh(geometry, material);
                                mesh.rotateX(-Math.PI / 2);
                                mesh.rotateZ(-Math.PI / 2);
                                scene.add(mesh);

                                loadedCount++;
                                if (loadedCount === totalFiles) onLoadingComplete();
                            });
                            return; // Exit onload as Draco is async
                        }

                        if (geometry) {
                            const material = new THREE.MeshBasicMaterial({ side: THREE.DoubleSide, vertexColors: true });
                            const mesh = new THREE.Mesh(geometry, material);
                            mesh.rotateX(-Math.PI / 2);
                            mesh.rotateZ(-Math.PI / 2);
                            scene.add(mesh);
                        }
                    } catch (error) {
                        console.error('Error loading file:', file.name, error);
                    }
                    loadedCount++;
                    if (loadedCount === totalFiles) onLoadingComplete();
                };
                reader.readAsArrayBuffer(file);
            });
        });
        
        // --- CONTROLS & EVENT LISTENERS ---
        document.getElementById('rotate-toggle').addEventListener('click', function() {
            isRotating = !isRotating;
            this.textContent = isRotating ? 'Pause Rotation' : 'Start Rotation';
        });
        
        document.getElementById('reset-view').addEventListener('click', function() {
            positionCamera();
            if (!animationId) animate();
        });

        document.addEventListener('keydown', (event) => {
            if (event.key.toLowerCase() in keys) keys[event.key.toLowerCase()] = true;
            if (!animationId && Object.values(keys).some(k => k)) animate();
        });

        document.addEventListener('keyup', (event) => {
            if (event.key.toLowerCase() in keys) keys[event.key.toLowerCase()] = false;
        });

        renderer.domElement.addEventListener('mousedown', (event) => {
            isMouseDown = true;
            previousMousePosition = { x: event.clientX, y: event.clientY };
            event.preventDefault();
        });

        document.addEventListener('mouseup', () => { isMouseDown = false; });

        document.addEventListener('mousemove', (event) => {
            if (isMouseDown) {
                const deltaMove = {
                    x: event.clientX - previousMousePosition.x,
                    y: event.clientY - previousMousePosition.y
                };
                
                const up = new THREE.Vector3(0, 1, 0);
                const right = new THREE.Vector3(1, 0, 0);
                
                camera.rotateOnWorldAxis(up, -deltaMove.x * 0.002);
                camera.rotateOnAxis(right, -deltaMove.y * 0.002);
                
                previousMousePosition = { x: event.clientX, y: event.clientY };
            }
        });

        renderer.domElement.addEventListener('contextmenu', (event) => event.preventDefault());

        window.addEventListener('resize', function() {
            camera.aspect = viewerContainer.clientWidth / viewerContainer.clientHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(viewerContainer.clientWidth, viewerContainer.clientHeight);
        });

        // --- ANIMATION LOOP ---
        function animate() {
            animationId = requestAnimationFrame(animate);

            let hasMoved = false;
            if (keys.w || keys.a || keys.s || keys.d) {
                const forward = new THREE.Vector3(0, 0, -1).applyQuaternion(camera.quaternion);
                const right = new THREE.Vector3(1, 0, 0).applyQuaternion(camera.quaternion);
                
                forward.y = 0; right.y = 0;
                forward.normalize(); right.normalize();
                
                const movement = new THREE.Vector3();
                if (keys.w) movement.add(forward);
                if (keys.s) movement.sub(forward);
                if (keys.a) movement.sub(right);
                if (keys.d) movement.add(right);
                
                if (movement.length() > 0) {
                    movement.normalize().multiplyScalar(moveSpeed);
                    camera.position.add(movement);
                    hasMoved = true;
                }
            }

            // Limit movement
            if (camera.position.length() > maxDistance) {
                 camera.position.setLength(maxDistance);
            }
            
            if (isRotating && scene.children.some(c => c instanceof THREE.Mesh)) {
                scene.rotation.y += 0.0005;
            }
            
            renderer.render(scene, camera);
        }
        
        animate(); // Start the animation loop
    </script>
</body>
</html>