index.js

class DiffRhythm2Installer {
    constructor() {
        this.pipeline = null;
        this.isInstalled = false;
        this.isLoading = false;
        this.initializeApp();
    }

    initializeApp() {
        this.bindEvents();
        this.checkExistingInstallation();
    }

    bindEvents() {
        document.getElementById('installBtn').addEventListener('click', () => this.installModel());
        document.getElementById('downloadScriptBtn').addEventListener('click', () => this.downloadPinokioScript());
        document.getElementById('generateBtn').addEventListener('click', () => this.generateMusic());
        document.getElementById('downloadBtn').addEventListener('click', () => this.downloadAudio());
    }

    checkExistingInstallation() {
        const installed = localStorage.getItem('diffrhythm2_installed');
        if (installed) {
            this.isInstalled = true;
            this.updateInstallationStatus('DiffRhythm2 is already installed!', 'success');
            document.getElementById('generateBtn').disabled = false;
        }
    }

    async installModel() {
        if (this.isLoading) return;

        this.isLoading = true;
        this.updateInstallationStatus('Starting installation...', 'info');
        this.showProgress();
        
        const installBtn = document.getElementById('installBtn');
        installBtn.disabled = true;

        try {
            // Show progress for model preparation
            this.updateProgress('Preparing DiffRhythm2 installation...', 10);

            // Create the Pinokio script configuration
            const pinokioScript = this.createPinokioScript();
            
            this.updateProgress('Creating installation files...', 30);
            
            // Simulate model download and setup
            await this.simulateModelDownload();
            
            this.updateProgress('Finalizing installation...', 90);
            
            // Mark as installed
            localStorage.setItem('diffrhythm2_installed', 'true');
            this.isInstalled = true;
            
            this.updateProgress('Installation complete!', 100);
            this.updateInstallationStatus('✅ DiffRhythm2 successfully installed! You can now generate music.', 'success');
            
            // Enable generate button
            document.getElementById('generateBtn').disabled = false;

        } catch (error) {
            console.error('Installation error:', error);
            this.updateInstallationStatus(`Installation failed: ${error.message}`, 'error');
        } finally {
            this.isLoading = false;
            installBtn.disabled = false;
        }
    }

    createPinokioScript() {
        const script = {
            "name": "DiffRhythm2",
            "version": "1.0.0",
            "description": "Text-to-Music Generation using DiffRhythm2 model",
            "author": "ASLP-lab",
            "repository": "https://huggingface.co/spaces/ASLP-lab/DiffRhythm2",
            "env": {
                "MODEL_ID": "ASLP-lab/DiffRhythm2",
                "DEVICE": "cuda"
            },
            "install": {
                "type": "shell",
                "commands": [
                    "git clone https://huggingface.co/spaces/ASLP-lab/DiffRhythm2",
                    "cd DiffRhythm2",
                    "pip install -r requirements.txt",
                    "pip install torch torchaudio --index-url https://download.pytorch.org/whl/cu118"
                ]
            },
            "run": {
                "type": "shell",
                "command": "cd DiffRhythm2 && python app.py"
            },
            "ui": {
                "url": "http://localhost:7860"
            }
        };

        return script;
    }

    downloadPinokioScript() {
        const script = this.createPinokioScript();
        const scriptContent = JSON.stringify(script, null, 2);
        
        const blob = new Blob([scriptContent], { type: 'application/json' });
        const url = URL.createObjectURL(blob);
        
        const a = document.createElement('a');
        a.href = url;
        a.download = 'diffrhythm2.pinokio.json';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
        
        this.updateInstallationStatus('Pinokio script downloaded! Import it in Pinokio to install.', 'success');
    }

    async simulateModelDownload() {
        // Simulate download progress
        for (let i = 40; i <= 80; i += 10) {
            await new Promise(resolve => setTimeout(resolve, 500));
            this.updateProgress('Downloading model files...', i);
        }
    }

    async generateMusic() {
        if (!this.isInstalled) {
            this.updateInstallationStatus('Please install DiffRhythm2 first!', 'error');
            return;
        }

        const prompt = document.getElementById('promptInput').value.trim();
        if (!prompt) {
            this.updateInstallationStatus('Please enter a music description!', 'error');
            return;
        }

        const duration = parseInt(document.getElementById('duration').value);
        const guidance = parseFloat(document.getElementById('guidance').value);

        const generateBtn = document.getElementById('generateBtn');
        generateBtn.disabled = true;
        generateBtn.textContent = 'Generating...';

        this.updateInstallationStatus('Generating music... This may take a few moments.', 'info');

        try {
            // In a real implementation, this would call the actual DiffRhythm2 model
            // For this demo, we'll simulate the generation process
            await this.simulateMusicGeneration(prompt, duration, guidance);
            
            // Show the result container
            document.getElementById('generationResult').classList.remove('hidden');
            
            this.updateInstallationStatus('Music generated successfully!', 'success');

        } catch (error) {
            console.error('Generation error:', error);
            this.updateInstallationStatus(`Generation failed: ${error.message}`, 'error');
        } finally {
            generateBtn.disabled = false;
            generateBtn.textContent = 'Generate Music';
        }
    }

    async simulateMusicGeneration(prompt, duration, guidance) {
        // Simulate generation progress
        this.showProgress();
        
        for (let i = 10; i <= 100; i += 10) {
            await new Promise(resolve => setTimeout(resolve, 300));
            this.updateProgress(`Generating: "${prompt}"...`, i);
        }

        // Create a mock audio file for demonstration
        // In a real implementation, this would be the actual generated audio
        const mockAudioData = this.createMockAudioData();
        const audioUrl = URL.createObjectURL(mockAudioData);
        
        const audioPlayer = document.getElementById('audioPlayer');
        audioPlayer.src = audioUrl;
        
        // Store the audio URL for download
        audioPlayer.dataset.audioUrl = audioUrl;
    }

    createMockAudioData() {
        // Create a simple silent audio file for demonstration
        // In a real implementation, this would be the actual generated audio
        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
        const duration = 10; // seconds
        const sampleRate = 44100;
        const numberOfChannels = 2;
        
        // Create empty buffer
        const frameCount = sampleRate * duration;
        const arrayBuffer = new ArrayBuffer(44 + frameCount * numberOfChannels * 2);
        
        return new Blob([arrayBuffer], { type: 'audio/wav' });
    }

    downloadAudio() {
        const audioPlayer = document.getElementById('audioPlayer');
        const audioUrl = audioPlayer.dataset.audioUrl;
        
        if (!audioUrl) {
            this.updateInstallationStatus('No audio to download!', 'error');
            return;
        }
        
        const a = document.createElement('a');
        a.href = audioUrl;
        a.download = 'diffrhythm2_generated_music.wav';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
    }

    updateProgress(text, percent) {
        document.getElementById('progressText').textContent = text;
        document.getElementById('progressPercent').textContent = `${percent}%`;
        document.getElementById('progressFill').style.width = `${percent}%`;
    }

    showProgress() {
        document.getElementById('progressContainer').classList.remove('hidden');
    }

    hideProgress() {
        document.getElementById('progressContainer').classList.add('hidden');
    }

    updateInstallationStatus(message, type) {
        const statusElement = document.getElementById('status');
        statusElement.textContent = message;
        statusElement.className = `status-message status-${type}`;
    }
}

// Example loader function
function loadExample(button) {
    const exampleText = button.parentElement.querySelector('p').textContent;
    document.getElementById('promptInput').value = exampleText;
}

// Initialize the application when the page loads
document.addEventListener('DOMContentLoaded', () => {
    new DiffRhythm2Installer();
});

// Web Worker for handling heavy computations (if needed)
if (window.Worker) {
    const worker = new Worker('worker.js');
    
    worker.onmessage = function(e) {
        console.log('Worker message:', e.data);
    };
}