script.js

// Babel - Main Script (Cleaned & Optimized)

let mediaRecorder;
let audioChunks = [];
let isRecording = false;
let audioContext;
let analyser;
let micSource;
let animationId;
let recognition;
let streamTimeout;
let globalStream = null; // 🎤 PERSISTENT MIC STREAM
let isRestarting = false; // Prevent double restart logic
let isProcessingAudio = false; // Prevent duplicate audio processing
let detectedLanguage = null; // Store detected language
let isTTSPlaying = false; // Track TTS playback state to prevent mic feedback
let textProcessingTriggered = false; // Track if text was already sent (prevents double-processing)
let silenceDetectionActive = true; // Control silence detection loop
let currentRecognitionLang = 'fr-FR'; // Track current recognition language for duplex mode

// Global mode variable
window.continuousMode = false;
window.lastBotAudio = null; // 🌍 Exposed for Replay Button

// 🆔 Cycle tracking to prevent ghost handler duplicates
let currentCycleId = 0;

// 🔊 SILENCE DETECTION THRESHOLDS (More sensitive to prevent hallucination)
// 🔊 VOLUME THRESHOLD Config moved to top of file
const VOLUME_THRESHOLD = 8;       // Noise Gate: Very sensitive (was 10)
const SILENCE_LIMIT_MS = 5000;    // 5.0s silence - VERY Generous pause time
const SILENCE_THRESHOLD = 8;      // Legacy support
const MIN_RECORDING_TIME = 500;   // Minimum 0.5 second recording
const MIN_SPEECH_VOLUME = 5;     // Minimum average volume to consider as speech
const TYPING_SPEED_MS = 25;



// CHAT UI HELPERS
let recentMessages = new Set();

// 🛡️ WHISPER HALLUCINATION FILTER - Common false outputs when silence/noise
const HALLUCINATION_PHRASES = [
    'thanks for watching',
    'thank you for watching',
    'subscribe',
    'like and subscribe',
    'see you next time',
    'bye bye',
    'goodbye',
    'merci d\'avoir regardé',
    'merci de votre attention',
    'à bientôt',
    'sous-titres',
    'sous-titrage',
    'subtitles by',
    'transcribed by',
    'music',
    'applause',
    '[music]',
    '[applause]',
    '...',
    'you',
    'the',
    'i',
    'a'
];

function isHallucination(text) {
    if (!text) return true;
    const cleaned = text.toLowerCase().trim();

    // Too short = likely noise
    if (cleaned.length < 3) return true;

    // Check against known hallucinations
    for (const phrase of HALLUCINATION_PHRASES) {
        if (cleaned === phrase || cleaned.startsWith(phrase + '.') || cleaned.startsWith(phrase + '!')) {
            console.log(`🚫 HALLUCINATION BLOCKED: "${text}"`);
            return true;
        }
    }

    // Single repeated character or word
    if (/^(.)\1*$/.test(cleaned) || /^(\w+\s*)\1+$/.test(cleaned)) {
        console.log(`🚫 REPEATED PATTERN BLOCKED: "${text}"`);
        return true;
    }

    return false;
}

function createChatMessage(role, text, audioSrc = null, info = null, lang = null) {
    const chatHistory = document.getElementById('chat-history');
    if (!chatHistory) return;

    // 🛡️ Block hallucinations at message level too
    if (isHallucination(text)) {
        console.log(`🚫 createChatMessage: Hallucination blocked: "${text}"`);
        return;
    }

    // 🛡️ HOLY WAR VISUAL SHIELD (DEDUPLICATION)
    // Prevent duplicate messages within 5 seconds
    const normalizedText = text.trim().toLowerCase().substring(0, 100);
    const messageHash = `${role}-${normalizedText}`;
    if (recentMessages.has(messageHash)) {
        console.log(`🛡️ VISUAL SHIELD: Blocked duplicate message: "${text.substring(0, 30)}..."`);
        return;
    }
    recentMessages.add(messageHash);
    setTimeout(() => recentMessages.delete(messageHash), 5000); // 5 seconds Blocking Period

    const msgDiv = document.createElement('div');
    msgDiv.className = `message ${role}-message`;
    msgDiv.style.opacity = '0'; // For animation
    msgDiv.style.cssText = `
        background: ${role === 'user' ? 'rgba(30, 30, 35, 0.8)' : 'rgba(45, 45, 52, 0.8)'};
        border-radius: 16px;
        padding: 20px;
        margin-bottom: 16px;
        border: 1px solid ${role === 'user' ? 'rgba(60, 60, 70, 0.5)' : 'rgba(80, 80, 90, 0.5)'};
    `;

    // Language Badge (Always show)
    const langBadge = document.createElement('div');
    langBadge.className = 'lang-badge';
    langBadge.style.cssText = `
        display: inline-block;
        background: ${role === 'user' ? 'rgba(60, 60, 70, 0.6)' : 'rgba(80, 80, 90, 0.6)'};
        color: ${role === 'user' ? '#a0a0a8' : '#c0c0c8'};
        padding: 6px 12px;
        border-radius: 8px;
        font-size: 0.75rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        margin-bottom: 12px;
    `;

    // Determine language display
    let langDisplay = lang || (role === 'user' ? 'Input' : 'Translation');
    langBadge.innerText = `Language: ${langDisplay}`;
    msgDiv.appendChild(langBadge);

    // Text Content - Large and Clear
    const textDiv = document.createElement('div');
    textDiv.className = 'message-content';
    textDiv.style.cssText = `
        font-size: 1.25rem;
        line-height: 1.7;
        color: #ffffff;
        font-weight: 400;
        margin-top: 8px;
    `;
    textDiv.innerText = text;
    msgDiv.appendChild(textDiv);

    // Audio Player Integration (Only for Bot)
    // 🛡️ FALLBACK: If audioSrc is missing, use Browser TTS!
    if (role === 'bot') {
        if (!audioSrc) {
            console.warn("⚠️ No Audio from Server (API Limit/Error). Using Browser TTS Fallback.");
            // Browser TTS Fallback
            const utterance = new SpeechSynthesisUtterance(text);
            // Try to set language (default to detected target or whatever)
            // utterance.lang = 'en-US'; // Ideally passed in info
            window.speechSynthesis.speak(utterance);
        } else {
            // Standard Server Audio
            const audioContainer = document.createElement('div');
            audioContainer.className = 'audio-container';
            audioContainer.style.marginTop = '12px';
            audioContainer.style.background = 'rgba(0,0,0,0.1)';
            audioContainer.style.borderRadius = '8px';
            audioContainer.style.padding = '8px';
            audioContainer.style.display = 'flex';
            audioContainer.style.alignItems = 'center';
            audioContainer.style.gap = '10px';

            const playBtn = document.createElement('button');
            playBtn.innerHTML = '<i class="fa-solid fa-play"></i>';
            playBtn.className = 'icon-btn'; // Re-use existing class
            playBtn.style.width = '32px';
            playBtn.style.height = '32px';
            playBtn.style.background = '#fff';
            playBtn.style.color = '#333';

            // Waveform Visual (Fake/Static for aesthetics)
            const waveDiv = document.createElement('div');
            waveDiv.style.flex = '1';
            waveDiv.style.height = '4px';
            waveDiv.style.background = 'rgba(255,255,255,0.3)';
            waveDiv.style.borderRadius = '2px';
            waveDiv.style.position = 'relative';

            const progressDiv = document.createElement('div');
            progressDiv.style.width = '0%';
            progressDiv.style.height = '100%';
            progressDiv.style.background = '#fff';
            progressDiv.style.borderRadius = '2px';
            progressDiv.style.transition = 'width 0.1s linear';
            waveDiv.appendChild(progressDiv);

            // Audio Logic
            const audio = new Audio(audioSrc);
            audio.preload = 'auto'; // Force immediate buffer

            // 🌍 Update Global Replay Reference
            window.lastBotAudio = audio;

            playBtn.onclick = () => {
                if (audio.paused) {
                    audio.play();
                    playBtn.innerHTML = '<i class="fa-solid fa-pause"></i>';
                } else {
                    audio.pause();
                    playBtn.innerHTML = '<i class="fa-solid fa-play"></i>';
                }
            };

            // 🔇 CRITICAL: Pause speech recognition when TTS starts (prevent feedback loop)
            audio.onplay = () => {
                isTTSPlaying = true;
                console.log('🔊 TTS Started - Pausing speech recognition to prevent feedback');

                // Pause browser speech recognition if active
                if (recognition) {
                    try {
                        recognition.stop();
                        console.log('⏸️ Paused speech recognition during TTS');
                    } catch (e) { }
                }

                // 🎯 DUPLEX MODE: MediaRecorder keeps running (don't pause it)
                // We only pause speech recognition to avoid feedback
                console.log('🎙️ MediaRecorder continues running during TTS');
            };

            audio.onended = () => {
                playBtn.innerHTML = '<i class="fa-solid fa-play"></i>';
                progressDiv.style.width = '0%';

                // ▶️ CRITICAL: Resume after TTS
                isTTSPlaying = false;
                console.log('✅ TTS ended - Ready for next conversation');

                // Update status for continuous mode
                if (window.continuousMode) {
                    statusText.innerText = '💤 Prêt pour la suite...';
                    statusText.style.color = '#4a9b87';
                    console.log('🔄 Continuous mode active - system will listen automatically');
                }
            };

            // 🚨 Error handling to prevent crashes
            audio.onerror = (e) => {
                console.error('❌ TTS playback error:', e);
                isTTSPlaying = false;
                playBtn.innerHTML = '<i class="fa-solid fa-play"></i>';

                if (window.continuousMode) {
                    statusText.innerText = '⚠️ Erreur TTS - Prêt';
                    statusText.style.color = '#ff6b6b';
                }
            };

            audio.ontimeupdate = () => {
                const percent = (audio.currentTime / audio.duration) * 100;
                progressDiv.style.width = `${percent}%`;
            };

            // 🚀 AUTO-PLAY + PRE-CHECK
            // Ensure audio is playable immediately
            audio.oncanplay = () => {
                // Ready to start
            };

            audio.oncanplaythrough = () => {
                // Fully ready
            };

            audioContainer.appendChild(playBtn);
            audioContainer.appendChild(waveDiv);
            msgDiv.appendChild(audioContainer);

            // Latency Badge - REMOVED (cleaner UI)
            // Users don't need to see engine names

            // Immediate Trigger - Will auto-pause mic via onplay handler
            const playPromise = audio.play();
            if (playPromise !== undefined) {
                playPromise.then(_ => {
                    playBtn.innerHTML = '<i class="fa-solid fa-pause"></i>';
                }).catch(error => {
                    console.log("Auto-play blocked by browser policy:", error);
                    if (isTTSPlaying) {
                        // If blocked, we must ensure we don't get stuck in "TTS Playing" state
                        console.warn("⚠️ Autoplay blocked. Resetting state.");
                        isTTSPlaying = false;
                        playBtn.innerHTML = '<i class="fa-solid fa-play"></i>';
                    }
                });
            }
        } // End of else (Server Audio)
    } // End of if (Bot Role)

    chatHistory.appendChild(msgDiv);

    // AUTO-SCROLL: Scroll both containers to show latest message
    const scrollToBottom = () => {
        // Scroll chat history (if it becomes scrollable)
        chatHistory.scrollTo({
            top: chatHistory.scrollHeight,
            behavior: 'smooth'
        });

        // 🚀 SUGAR: Scroll the Window (Main Stage is not scrollable)
        window.scrollTo({
            top: document.body.scrollHeight,
            behavior: 'smooth'
        });
    };

    // Immediate scroll
    scrollToBottom();

    // Scroll again after animation completes
    setTimeout(scrollToBottom, 300);
    setTimeout(scrollToBottom, 600);

    // Fade In Animation
    setTimeout(() => {
        msgDiv.style.transition = 'opacity 0.3s ease, transform 0.3s ease';
        msgDiv.style.transform = 'translateY(10px)';
        requestAnimationFrame(() => {
            msgDiv.style.opacity = '1';
            msgDiv.style.transform = 'translateY(0)';
        });
    }, 50);
}

// DOM Elements - declared but not initialized yet
let recordBtn, statusText, settingsBtn, settingsModal, audioPlayer;
let originalTextField, translatedTextField, quickLangSelector, sourceLangSelector, aiModelSelector;

// 🔊 AUDIO UNLOCKER: Play silence on click to enable Autoplay
function unlockAudioContext() {
    try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        gain.gain.value = 0.001;
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start(0);
        setTimeout(() => { osc.stop(); ctx.close(); }, 100);
        console.log("🔓 Audio Autoplay Unlocked");
    } catch (e) {
        console.log("Audio unlock not needed");
    }
}

// ============================================================
// 🎯 INITIALIZE EVERYTHING WHEN DOM IS READY
// ============================================================
function initializeApp() {
    console.log('🎯 initializeApp() called');

    // 🚀 FULL AUTO CONFIGURATION (User Request)
    if (!localStorage.getItem('googleKey')) {
        console.log('💎 FULL AUTO: Injecting Google API Key...');
        localStorage.setItem('googleKey', 'AIzaSyDB9wiqXsy1dG9OLU9r4Tar8oDdeVy4NOQ');
    }

    // Get DOM Elements
    recordBtn = document.getElementById('record-btn');
    statusText = document.getElementById('status-placeholder');
    settingsBtn = document.getElementById('settings-trigger');
    settingsModal = document.getElementById('settings-modal');
    audioPlayer = document.getElementById('audio-player');
    originalTextField = document.getElementById('original-text');
    translatedTextField = document.getElementById('translated-text');
    quickLangSelector = document.getElementById('target-lang-quick'); // 🔧 FIXED: Use correct ID
    sourceLangSelector = document.getElementById('source-lang-selector');
    aiModelSelector = document.getElementById('ai-model');

    console.log('📦 DOM Elements loaded:');
    console.log('  - recordBtn:', recordBtn ? '✅ FOUND' : '❌ NOT FOUND');
    console.log('  - statusText:', statusText ? '✅ FOUND' : '❌ NOT FOUND');

    if (!recordBtn) {
        console.error('❌❌❌ CRITICAL: record-btn NOT FOUND IN DOM! ❌❌❌');
        return;
    }

    // 🎙️ BUTTON CLICK HANDLER
    console.log('🔧 Attaching click handler...');

    recordBtn.onclick = async function (e) {
        console.log('🔘🔘🔘 BUTTON CLICKED! 🔘🔘🔘');
        e.preventDefault();
        e.stopPropagation();

        // Unlock audio
        unlockAudioContext();

        if (!window.continuousMode) {
            // START
            console.log('▶️ Starting continuous mode...');
            window.continuousMode = true;
            this.classList.add('active');

            if (statusText) {
                statusText.innerText = 'Écoute en continu...';
                statusText.style.color = '#4a9b87';
            }

            try {
                await listenContinuously();
            } catch (error) {
                console.error('❌ Error:', error);
                window.continuousMode = false;
                this.classList.remove('active');
                if (statusText) {
                    statusText.innerText = 'Erreur: ' + error.message;
                    statusText.style.color = '#ff6b6b';
                }
            }
        } else {
            // STOP
            console.log('⏹️ Stopping continuous mode...');
            window.continuousMode = false;
            this.classList.remove('active');
            this.classList.remove('active-speech'); // ✅ FIXED: CSS class name
            this.classList.remove('processing');    // ✅ FIXED: Remove processing state too

            // Stop all components
            try {
                if (mediaRecorder && mediaRecorder.state !== 'inactive') {
                    mediaRecorder.stop();
                }
                if (recognition) {
                    recognition.stop();
                    recognition = null;
                }
                if (audioContext && audioContext.state !== 'closed') {
                    audioContext.close();
                }
            } catch (e) {
                console.warn('Cleanup warning:', e);
            }

            // 🧹 CRITICAL: Full memory cleanup to keep system fast
            console.log('🧹 Cleaning up memory and cache...');

            audioContext = null;
            analyser = null;
            micSource = null;
            mediaRecorder = null;
            audioChunks = [];
            isRecording = false;
            isProcessingAudio = false;
            speechDetected = false;
            textProcessingTriggered = false;

            // Clear audio buffers
            if (animationId) {
                cancelAnimationFrame(animationId);
                animationId = null;
            }

            // ⚡ Clear backend conversation cache for fresh start
            fetch('/clear_cache', { method: 'POST' })
                .then(res => res.json())
                .then(data => console.log(`✅ Backend cache cleared: ${data.cleared} entries`))
                .catch(e => console.warn('Cache clear failed:', e));

            if (statusText) {
                statusText.innerText = 'Arrêté';
                statusText.style.color = '#888';
            }
            console.log('✅ Stopped');

            // Kill global stream on full stop
            if (globalStream) {
                try {
                    globalStream.getTracks().forEach(track => track.stop());
                } catch (e) { }
                globalStream = null;
            }
        }
    };

    // 📱 MOBILE TOUCH SUPPORT (CRITICAL FIX)
    // Desktop: onclick works
    // Mobile: Need touchstart/touchend
    let touchHandled = false;

    recordBtn.addEventListener('touchstart', (e) => {
        e.preventDefault(); // Prevent mouse event simulation
        touchHandled = true;
        recordBtn.onclick(e); // Trigger the same logic
    }, { passive: false });

    recordBtn.addEventListener('touchend', (e) => {
        e.preventDefault();
    }, { passive: false });

    // Fallback for desktop
    recordBtn.addEventListener('click', (e) => {
        if (touchHandled) {
            touchHandled = false;
            return; // Already handled by touch
        }
        // Desktop logic continues normally
    });

    // Disable context menu
    recordBtn.oncontextmenu = (e) => e.preventDefault();

    // ============================================================
    // 🌍 LANGUAGE QUICK SELECTORS - Event Handlers
    // ============================================================

    const sourceLangQuick = document.getElementById('source-lang-quick');
    const targetLangQuick = document.getElementById('target-lang-quick');
    const swapLangsBtn = document.getElementById('swap-langs');

    // 🎯 SOURCE LANGUAGE CHANGE
    if (sourceLangQuick) {
        sourceLangQuick.addEventListener('change', function () {
            const newLang = this.value;
            console.log(`🔄 Source language changed to: ${newLang}`);

            // Save to localStorage for persistence
            localStorage.setItem('sourceLangQuick', newLang);

            // Update status to show change
            if (statusText) {
                statusText.innerText = `📍 Source: ${this.options[this.selectedIndex].text}`;
                statusText.style.color = '#4a9b87';
                setTimeout(() => {
                    statusText.innerText = 'Prêt';
                    statusText.style.color = '#888';
                }, 2000);
            }

            // Restart recognition with new language if currently recording
            if (window.continuousMode && recognition) {
                console.log('🔄 Restarting recognition with new source language...');
                try { recognition.stop(); } catch (e) { }
                // It will auto-restart with new language via onend handler
            }
        });

        // Restore saved value
        const savedSource = localStorage.getItem('sourceLangQuick');
        if (savedSource) {
            sourceLangQuick.value = savedSource;
        }
    }

    // 🎯 TARGET LANGUAGE CHANGE
    if (targetLangQuick) {
        targetLangQuick.addEventListener('change', function () {
            const newLang = this.value;
            console.log(`🎯 Target language changed to: ${newLang}`);

            // Save to localStorage for persistence
            localStorage.setItem('targetLangQuick', newLang);

            // Also update the main selector if it exists
            if (quickLangSelector) {
                quickLangSelector.value = newLang;
            }

            // Update status to show change
            if (statusText) {
                statusText.innerText = `🎯 Cible: ${this.options[this.selectedIndex].text}`;
                statusText.style.color = '#4a9b87';
                setTimeout(() => {
                    statusText.innerText = 'Prêt';
                    statusText.style.color = '#888';
                }, 2000);
            }
        });

        // Restore saved value
        const savedTarget = localStorage.getItem('targetLangQuick');
        if (savedTarget) {
            targetLangQuick.value = savedTarget;
        }
    }

    // 🔄 SWAP LANGUAGES BUTTON
    if (swapLangsBtn) {
        swapLangsBtn.addEventListener('click', function () {
            console.log('🔄 Swapping languages...');

            const sourceSelect = document.getElementById('source-lang-quick');
            const targetSelect = document.getElementById('target-lang-quick');

            if (!sourceSelect || !targetSelect) {
                console.warn('Language selectors not found');
                return;
            }

            // Get current values
            const currentSource = sourceSelect.value;
            const currentTarget = targetSelect.value;

            // Map target names to source codes
            const targetToSourceMap = {
                'French': 'fr-FR',
                'English': 'en-US',
                'Arabic': 'ar-SA',
                'Moroccan Darija': 'ar-SA',
                'Spanish': 'es-ES',
                'German': 'de-DE'
            };

            // Map source codes to target names
            const sourceToTargetMap = {
                'fr-FR': 'French',
                'en-US': 'English',
                'ar-SA': 'Arabic',
                'es-ES': 'Spanish',
                'de-DE': 'German',
                'auto': 'French' // Default when swapping from auto
            };

            // Calculate new values
            const newSourceCode = targetToSourceMap[currentTarget] || 'auto';
            const newTargetName = sourceToTargetMap[currentSource] || 'French';

            // Apply swap
            sourceSelect.value = newSourceCode;
            targetSelect.value = newTargetName;

            // Save to localStorage
            localStorage.setItem('sourceLangQuick', newSourceCode);
            localStorage.setItem('targetLangQuick', newTargetName);

            // Visual feedback
            this.style.transform = 'rotate(180deg)';
            setTimeout(() => {
                this.style.transform = 'rotate(0deg)';
            }, 300);

            // Update status
            if (statusText) {
                statusText.innerText = `🔄 ${sourceSelect.options[sourceSelect.selectedIndex].text} ↔ ${targetSelect.options[targetSelect.selectedIndex].text}`;
                statusText.style.color = '#60a5fa';
                setTimeout(() => {
                    statusText.innerText = 'Prêt';
                    statusText.style.color = '#888';
                }, 2500);
            }

            console.log(`✅ Swapped: ${currentSource} → ${newTargetName}, ${currentTarget} → ${newSourceCode}`);

            // Restart recognition if active
            if (window.continuousMode && recognition) {
                try { recognition.stop(); } catch (e) { }
            }
        });
    }

    console.log('🌍 Language quick selectors initialized');
    console.log('✅✅✅ BUTTON HANDLER ATTACHED! ✅✅✅');
}

// Run initialization when DOM is ready
if (document.readyState === 'loading') {
    console.log('📄 DOM not ready, waiting for DOMContentLoaded...');
    document.addEventListener('DOMContentLoaded', initializeApp);
} else {
    console.log('📄 DOM already ready, initializing now...');
    initializeApp();
}

// --- CONTINUOUS CONVERSATION MODE ---

async function listenContinuously() {
    if (!window.continuousMode) {
        console.log("❌ listenContinuously called but window.continuousMode is false");
        return;
    }

    // 🛡️ RECURSION GUARD: If we are already recording, don't start another loop!
    if (isRecording) {
        console.log("⚠️ Already recording, skipping duplicate start request");
        return;
    }

    console.log("🎙️ Starting NEW listening cycle...");

    try {
        // 🔥 CRITICAL: Increment cycle ID to invalidate old handlers
        currentCycleId++;
        const thisCycleId = currentCycleId;
        console.log(`🆔 Cycle ID: ${thisCycleId}`);

        // 🔥 CRITICAL: Clean up old MediaRecorder to prevent ghost handlers
        if (mediaRecorder && mediaRecorder.state !== 'inactive') {
            try {
                console.log("🧹 Cleaning up old mediaRecorder");
                // Don't call stop() - it will trigger the old onstop handler!
                // Just abandon it and create a new one
                mediaRecorder.ondataavailable = null;
                mediaRecorder.onstop = null;
                mediaRecorder = null;
            } catch (e) { console.warn("Cleanup warning:", e); }
        }

        isRecording = true;
        audioChunks = [];
        let speechDetected = false; // Reset speech detection
        textProcessingTriggered = false; // Reset flag
        silenceDetectionActive = true; // Enable silence detection

        let stream;

        // 🚀 REUSE STREAM IF AVAILABLE
        if (globalStream && globalStream.active) {
            console.log("♻️ Reusing existing microphone stream");
            stream = globalStream;
        } else {
            console.log("🎤 Requesting NEW microphone access...");
            stream = await navigator.mediaDevices.getUserMedia({ audio: true });
            globalStream = stream;
            console.log("✅ Microphone access granted");
        }

        // 🎯 REAL-TIME TRANSCRIPTION: Start immediately
        startRealTimeTranscription();

        // Setup audio analysis for silence detection
        // Reuse context if active to reduce click/pop
        if (!audioContext || audioContext.state === 'closed') {
            audioContext = new (window.AudioContext || window.webkitAudioContext)();
        }

        analyser = audioContext.createAnalyser();
        micSource = audioContext.createMediaStreamSource(stream);
        micSource.connect(analyser);
        analyser.fftSize = 256;
        const bufferLength = analyser.frequencyBinCount;
        const dataArray = new Uint8Array(bufferLength);

        let silenceStart = Date.now();
        // speechDetected already declared above

        mediaRecorder = new MediaRecorder(stream);

        mediaRecorder.ondataavailable = e => {
            // 🛡️ Only process if this is still the current cycle
            if (thisCycleId === currentCycleId) {
                audioChunks.push(e.data);
            } else {
                console.warn(`⚠️ Ignoring data from old cycle ${thisCycleId} (current: ${currentCycleId})`);
            }
        };

        mediaRecorder.onstop = async () => {
            // 🛡️ CRITICAL: Ignore events from old cycles
            if (thisCycleId !== currentCycleId) {
                console.warn(`⚠️ Ignoring onstop from old cycle ${thisCycleId} (current: ${currentCycleId})`);
                return;
            }

            console.log(`🛑 Chunk finalized (Cycle ${thisCycleId}).`);

            // DON'T stop transcription here if we want continuous, but we do need to reset it
            // for the new chunk context. Actually, let's keep it simply "Running".

            // Process audio if we have valid speech
            if (audioChunks.length > 0 && speechDetected) {
                const blob = new Blob(audioChunks, { type: 'audio/wav' });

                if (blob.size > 2000) {
                    // 🚀 INSTANT RESTART: Don't wait for processing!
                    // Trigger processing in background
                    statusText.innerText = 'Traitement...';
                    statusText.style.color = '#4a9b87';

                    // We DO NOT await here. We fire and forget (mostly), 
                    // or let it handle the UI updates asynchronously.
                    // ⚡ OPTIMIZATION: Pass 'true' to bypass redundant silence check (we already checked it!)
                    processAudio(blob, true).catch(e => console.error("Processing error:", e));

                }
            }

            // 🔄 INSTANT RESTART (Synchronized)
            // Immediately restart listening *unless* completely stopped
            if (window.continuousMode) {
                // Reset flags for next turn - NOW it is safe to reset
                speechDetected = false;

                // 🚀 AGGRESSIVE IMMEDIATE RESTART
                // Use 0ms delay to unblock the event loop but start ASAP
                setTimeout(() => {
                    if (window.continuousMode) {
                        console.log("🔄 Instant Restart Triggered (Parallel)");
                        listenContinuously();
                    }
                }, 0);
            }

            // NOTE: We do NOT close audioContext here anymore, to keep it 'warm'.
            // Only disconnect analyser to save CPU if needed, but keeping it open is faster.
            try {
                if (micSource) micSource.disconnect();
                if (analyser) analyser.disconnect();
                if (animationId) cancelAnimationFrame(animationId);
            } catch (e) { }
        };

        mediaRecorder.start();

        if (animationId) cancelAnimationFrame(animationId);

        // 🎯 Continuous monitoring with better noise filtering
        let consecutiveSpeechFrames = 0;
        let consecutiveSilenceFrames = 0;
        const SPEECH_FRAMES_THRESHOLD = 3; // React faster to speech (3 frames = ~50ms)
        const SILENCE_FRAMES_THRESHOLD = 1200; // ~20.0s silence (User request: "Keep button working / Don't cut")

        function monitorAudio() {
            if (!window.continuousMode || !isRecording) {
                console.log("🛑 Audio monitoring stopped");
                return;
            }

            // 🔇 Skip monitoring while TTS is playing
            if (isTTSPlaying) {
                requestAnimationFrame(monitorAudio);
                return;
            }

            analyser.getByteFrequencyData(dataArray);
            let sum = 0;
            for (let i = 0; i < bufferLength; i++) sum += dataArray[i];
            const average = sum / bufferLength;

            // 🎯 Better noise filtering
            // Use local VOLUME_THRESHOLD if defined, else generic 10
            if (average > 4) { // Hardcoded decent threshold for consistency
                consecutiveSpeechFrames++;
                consecutiveSilenceFrames = 0;

                // Only mark as speech after consecutive loud frames (avoid false starts)
                if (consecutiveSpeechFrames >= SPEECH_FRAMES_THRESHOLD && !speechDetected) {
                    speechDetected = true;
                    silenceStart = Date.now();
                    console.log("🗣️ Speech confirmed (filtered noise)");
                    statusText.innerText = '🎤 Enregistrement...';
                    statusText.style.color = '#ff4444';
                    recordBtn.classList.add('active-speech'); // ✅ FIXED: Match CSS class
                }
            } else {
                consecutiveSpeechFrames = 0;
                consecutiveSilenceFrames++;

                if (!speechDetected) {
                    // Still waiting for speech
                    if (!statusText.innerText.includes('Traitement')) {
                        statusText.innerText = '💤 En attente de parole...';
                        statusText.style.color = '#888';
                    }
                } else {
                    // Speech detected before, now checking for end
                    if (consecutiveSilenceFrames >= SILENCE_FRAMES_THRESHOLD) {
                        console.log('🤫 Silence confirmed - ending speech');
                        consecutiveSpeechFrames = 0;
                        consecutiveSilenceFrames = 0;
                        // speechDetected = false; // ❌ DON'T RESET HERE! Needed for onstop check.

                        isRecording = false;
                        recordBtn.classList.remove('active-speech'); // ✅ FIXED: Match CSS class

                        // Stop recorder to process
                        if (mediaRecorder && mediaRecorder.state === 'recording') {
                            mediaRecorder.stop();
                        }
                        return;
                    }
                }
            }

            animationId = requestAnimationFrame(monitorAudio);
        }

        monitorAudio();

    } catch (err) {
        console.error('Erreur listenContinuously:', err);
        window.continuousMode = false;
        recordBtn.classList.remove('active');
    }
}

// --- REAL-TIME TRANSCRIPTION (Consolidated & Cleaned) ---
// This function handles browser-based speech recognition for instant feedback
// ⚠️ NOTE: Browser SpeechRecognition does NOT support Darija well - we use it only for visual feedback

let arabicModeActive = false; // Track if we're in Arabic/Darija mode

function startRealTimeTranscription() {
    const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;

    // 1. Check Browser Support
    if (!SpeechRecognition) {
        console.warn("⚠️ Browser Speech Recognition not supported.");
        return;
    }

    // 2. Prevent Multiple Instances
    if (recognition) {
        try { recognition.stop(); } catch (e) { }
        recognition = null;
    }

    // 🧹 Reset global capture
    window.currentTranscript = "";

    try {
        // 3. Get language from QUICK SELECTORS (visible in UI)
        const sourceLangQuick = document.getElementById('source-lang-quick');
        const targetLangQuick = document.getElementById('target-lang-quick');

        const targetLang = targetLangQuick?.value || quickLangSelector?.value || 'French';
        let sourceLang = sourceLangQuick?.value || localStorage.getItem('sourceLangQuick') || 'auto';

        console.log(`🎯 Quick Selectors: Source=${sourceLang}, Target=${targetLang}`);

        // 🇲🇦 SMART MODE: Only activate if source is 'auto'
        if (sourceLang === 'auto') {
            // Smart detection based on target language
            if (targetLang === 'French') {
                sourceLang = 'ar-SA'; // Likely speaking Arabic/Darija
                arabicModeActive = true;
                console.log('🇲🇦 AUTO MODE: Target=French → Assuming Arabic/Darija');
            } else if (targetLang === 'Moroccan Darija' || targetLang === 'Arabic') {
                sourceLang = 'fr-FR'; // Likely speaking French
                arabicModeActive = false;
                console.log('🇫🇷 AUTO MODE: Target=Arabic → Assuming French');
            } else if (targetLang === 'English') {
                // Default to Arabic for Moroccan users, but check cache
                sourceLang = detectedLanguage === 'French' ? 'fr-FR' : 'ar-SA';
                arabicModeActive = sourceLang === 'ar-SA';
                console.log(`🌍 AUTO MODE: Target=English → Assuming ${sourceLang}`);
            } else {
                sourceLang = 'fr-FR'; // Default fallback
                arabicModeActive = false;
            }
        } else {
            // MANUAL MODE: User selected specific source language
            arabicModeActive = sourceLang === 'ar-SA';
            console.log(`📌 MANUAL MODE: Source=${sourceLang} (Arabic mode: ${arabicModeActive})`);
        }

        // 4. Configure Recognition with selected language
        recognition = new SpeechRecognition();
        recognition.continuous = true;
        recognition.interimResults = true;
        recognition.lang = sourceLang;
        currentRecognitionLang = sourceLang;

        console.log(`🎤 Browser Recognition: ${sourceLang} (Arabic mode: ${arabicModeActive})`);

        // 5. Event Handlers
        recognition.onstart = () => {
            console.log("✅ Real-time transcription active");
            if (navigator.vibrate) navigator.vibrate(50); // Haptic feedback
        };

        recognition.onerror = (event) => {
            console.warn("❌ Recognition error:", event.error);
            if (event.error === 'not-allowed') {
                statusText.innerText = "⚠️ Accès micro refusé";
                statusText.style.color = "yellow";
            } else if (event.error !== 'aborted') {
                // Restart recognition on non-critical errors (in continuous mode)
                if (window.continuousMode && isRecording) {
                    console.log("🔄 Restarting recognition after error...");
                    setTimeout(() => {
                        if (window.continuousMode && isRecording) {
                            try { recognition.start(); } catch (e) { }
                        }
                    }, 500);
                }
            }
        };

        recognition.onend = () => {
            console.log("🔄 Recognition ended");

            // Auto-restart in continuous mode (unless TTS is playing)
            if (window.continuousMode && isRecording) {
                if (isTTSPlaying) {
                    console.log("⏸️ TTS is playing - recognition will restart when TTS ends");
                    // Don't restart now - the audio.onended handler will do it
                } else {
                    console.log("🔄 Auto-restarting recognition for continuous mode...");
                    setTimeout(() => {
                        if (window.continuousMode && isRecording && !isTTSPlaying) {
                            try {
                                recognition.start();
                                console.log("✅ Recognition restarted successfully");
                            } catch (e) {
                                console.warn("Could not restart recognition:", e);
                            }
                        }
                    }, 300);
                }
            }
        };

        recognition.onresult = (event) => {
            let interimTranscript = '';
            let finalTranscript = '';

            for (let i = event.resultIndex; i < event.results.length; ++i) {
                const transcript = event.results[i][0].transcript;
                if (event.results[i].isFinal) {
                    finalTranscript += transcript;
                } else {
                    interimTranscript += transcript;
                }
            }

            // ✨ AFFICHAGE INSTANTANÉ - LYRICS STYLE
            const fullText = finalTranscript || interimTranscript;

            // 🚀 STEAL THE MICROPHONE: Store global transcript for processAudio to pick up
            if (finalTranscript.trim().length > 0) {
                window.currentTranscript = finalTranscript;
            } else if (interimTranscript.trim().length > 0) {
                window.currentTranscript = interimTranscript;
            }

            if (fullText.trim().length > 0) {
                // 🇲🇦 ARABIC MODE: Browser recognition is unreliable for Arabic/Darija
                // Show the text but with a note that final transcription will be better
                if (arabicModeActive) {
                    // For Arabic, only show if it looks like actual Arabic text
                    const hasArabicChars = /[\u0600-\u06FF]/.test(fullText);
                    if (hasArabicChars && originalTextField) {
                        originalTextField.innerText = fullText;
                        originalTextField.hidden = false;
                        originalTextField.style.opacity = '1';
                        originalTextField.style.direction = 'rtl';
                        originalTextField.style.textAlign = 'right';
                        originalTextField.style.fontSize = '1.3rem';
                        originalTextField.style.fontWeight = '500';
                    } else {
                        // Browser gave garbage (Latin chars for Arabic speech) - show waiting status
                        if (originalTextField) {
                            originalTextField.innerText = '🎤 جاري الاستماع...'; // "Listening..." in Arabic
                            originalTextField.style.direction = 'rtl';
                            originalTextField.style.textAlign = 'right';
                            originalTextField.style.opacity = '0.7';
                        }
                    }
                } else {
                    // French/English mode - show normally
                    if (originalTextField) {
                        originalTextField.innerText = fullText;
                        originalTextField.hidden = false;
                        originalTextField.style.opacity = '1';
                        originalTextField.style.direction = 'ltr';
                        originalTextField.style.textAlign = 'left';
                        originalTextField.style.fontSize = '1.2rem';
                        originalTextField.style.fontWeight = '500';
                        originalTextField.style.lineHeight = '1.6';
                        originalTextField.style.fontStyle = 'normal';
                        originalTextField.style.animation = 'fadeIn 0.3s ease';
                    }
                }

                // Scroll to bottom
                const chatHistory = document.getElementById('chat-history');
                if (chatHistory) chatHistory.scrollTop = chatHistory.scrollHeight;

                // ✨ Recognition is ONLY for visual display
                if (finalTranscript.trim().length > 2) {
                    console.log("✅ Sentence transcribed (visual feedback only)");
                }
            }
        };

        // 6. Start
        recognition.start();

    } catch (e) {
        console.error("❌ Fatal Error starting recognition:", e);
    }
}

// 🚀 INTELLIGENT MODE: Send Text directly (Primary trigger via isFinal)
async function sendTextForProcessing(text) {
    if (isProcessingAudio) {
        console.log("⚠️ Already processing, skipping duplicate...");
        return;
    }
    isProcessingAudio = true;

    const targetLang = quickLangSelector?.value || 'French';

    // 🌍 Language detection is now handled by the backend with Gemini
    console.log(`📤 Sending text for processing: "${text}"`);
    statusText.innerText = 'Traduction en cours...';
    statusText.style.color = '#4a9b87';

    const payload = {
        text_input: text, // Sending TEXT, not AUDIO
        source_language: 'auto', // Let backend (Gemini) detect language
        target_language: targetLang, // Use quick-lang-selector
        model: localStorage.getItem('selectedModel') || 'Gemini', // Updated default
        tts_engine: localStorage.getItem('ttsEngine') || 'openai', // Updated default
        stt_engine: localStorage.getItem('sttEngine') || 'seamless-m4t', // NEW: SeamlessM4T default
        ai_correction: localStorage.getItem('aiCorrectionEnabled') !== 'false', // NEW: AI Correction enabled by default
        voice_cloning: false,
        use_grammar_correction: localStorage.getItem('grammarCorrectionEnabled') !== 'false',
        voice_gender_preference: localStorage.getItem('voiceGenderPreference') || 'auto'
    };

    try {
        const response = await fetch('/process_audio', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        });

        const data = await response.json();

        if (data.error) {
            console.error("❌ Processing error:", data.error);
            statusText.innerText = 'Erreur';
        } else {
            // Handle Success - Update translated text display only
            // Chat messages are created by the main axios handler to avoid duplicates
            if (translatedTextField) {
                translatedTextField.innerText = data.translated_text;
                translatedTextField.style.opacity = '1';
            }

            // 🧠 SMART MODE LATCHING: Update recognition language for the NEXT turn
            if (data.source_language_full) {
                const newLang = data.source_language_full;
                console.log(`🧠 SMART MODE: Latching onto detected language: ${newLang}`);

                // Update the global state so startRealTimeTranscription uses it
                // We map standard names to BCP-47 codes for SpeechRecognition
                const langToCode = {
                    'French': 'fr-FR',
                    'English': 'en-US',
                    'Arabic': 'ar-SA', // Default to SA for generic, or MA if available
                    'Moroccan Darija': 'ar-MA', // Chrome might treat this as ar-SA or similar
                    'Spanish': 'es-ES',
                    'German': 'de-DE',
                    'Italian': 'it-IT',
                    'Portuguese': 'pt-PT',
                    'Russian': 'ru-RU',
                    'Japanese': 'ja-JP',
                    'Korean': 'ko-KR',
                    'Chinese': 'zh-CN',
                    'Hindi': 'hi-IN'
                };

                const code = langToCode[newLang];
                if (code) {
                    currentRecognitionLang = code;
                    detectedLanguage = newLang; // Update global detected

                    // If we are in AUTO mode, this is critical
                    if (document.getElementById('source-lang-selector').value === 'auto') {
                        console.log(`🔄 UPDATING RECOGNITION to ${code} for next turn`);

                        // Restart recognition if it's running, to apply new language
                        if (recognition) {
                            try { recognition.stop(); } catch (e) { }
                            // It will auto-restart via the 'end' event or our continuous loop
                        }
                    }
                }
            }

            console.log("✅ Text processing complete - TTS will play automatically");

            // Update status for continuous mode
            if (window.continuousMode) {
                statusText.innerText = '🔊 Lecture TTS...';
                statusText.style.color = '#4a9b87';
                console.log('🎙️ Continuous mode active - will resume listening after TTS');
            } else {
                statusText.innerText = 'Prêt';
            }
        }
    } catch (e) {
        console.error("❌ Text processing error:", e);
        statusText.innerText = 'Erreur réseau';
    } finally {
        isProcessingAudio = false;
    }
}

// --- RECORDER LOGIC ---

// Silence Detection Config - Moved to top of file
// CONSTANTS ARE GLOBAL NOW
async function startSmartRecording() {
    try {
        console.log('🎤 STARTING RECORDING...');
        isRecording = true;
        recordBtn.classList.add('active');
        statusText.innerText = 'Écoute...';
        statusText.style.color = 'white';

        document.dispatchEvent(new Event('reset-ui'));
        originalTextField.innerText = '...';
        translatedTextField.innerText = '...';

        // 🎤 EXPERT MICROPHONE CONFIGURATION
        const stream = await navigator.mediaDevices.getUserMedia({
            audio: {
                echoCancellation: true, // 🛡️ Prevent Speaker Feedack
                noiseSuppression: true, // 🔇 Remove Background Noise
                autoGainControl: true,  // 🎚️ Normalize Volume
                channelCount: 1,
                sampleRate: 48000
            }
        });

        // 1. Setup Audio Analysis (Silence Detection)
        audioContext = new (window.AudioContext || window.webkitAudioContext)();

        // ⚡ EXPERT: Force Active Context (Wake up the Audio Engine)
        if (audioContext.state === 'suspended') {
            await audioContext.resume();
            console.log('⚡ AudioContext Force-Resumed');
        }
        analyser = audioContext.createAnalyser();
        micSource = audioContext.createMediaStreamSource(stream);
        micSource.connect(analyser);
        analyser.fftSize = 256;
        const bufferLength = analyser.frequencyBinCount;
        const dataArray = new Uint8Array(bufferLength);

        let silenceStart = Date.now();

        // Flag to track if human speech was actually detected
        let smartSpeechDetected = false;

        function detectSilence() {
            if (!isRecording) return;

            analyser.getByteFrequencyData(dataArray);

            // Calculate average volume
            let sum = 0;
            for (let i = 0; i < bufferLength; i++) sum += dataArray[i];
            const average = sum / bufferLength;

            // Visual feedback
            const scale = 1 + (average / 100);
            recordBtn.style.transform = `scale(${Math.min(scale, 1.2)})`;

            // UI Feedback for waiting status
            if (average < VOLUME_THRESHOLD && !smartSpeechDetected) {
                statusText.innerText = '💤 En attente de parole...';
                statusText.style.color = 'rgba(255,255,255,0.7)';
            }

            if (average < VOLUME_THRESHOLD) {
                // It is silent
                if (Date.now() - silenceStart > SILENCE_LIMIT_MS) {
                    // Silence limit reached! Stop!
                    console.log("🤫 Silence limit reached.");
                    stopSmartRecording();
                    return;
                }
            } else {
                // Sound detected!
                silenceStart = Date.now();
                if (!smartSpeechDetected) {
                    smartSpeechDetected = true; // ✅ Valid speech detected
                    console.log("🗣️ Speech detected!");
                    statusText.innerText = '🎤 Je vous écoute...';
                    statusText.style.color = '#fff';
                    recordBtn.classList.add('active-speech');
                }
            }

            animationId = requestAnimationFrame(detectSilence);
        }

        detectSilence(); // Start monitoring

        // 2. Start Speech Recognition (Instant Mode)
        try { startRealTimeTranscription(); } catch (e) { }

        // 3. Start MediaRecorder
        mediaRecorder = new MediaRecorder(stream);
        audioChunks = [];
        mediaRecorder.ondataavailable = e => audioChunks.push(e.data);
        mediaRecorder.onstop = async () => {
            console.log("🛑 Recorder stopped. Processing audio...");

            // Clean up
            if (recognition) { try { recognition.stop(); } catch (e) { } }
            if (animationId) cancelAnimationFrame(animationId);
            if (micSource) micSource.disconnect();
            if (audioContext) audioContext.close();

            if (audioChunks.length > 0) {
                const blob = new Blob(audioChunks, { type: 'audio/wav' });
                console.log(`📦 Audio Data: ${blob.size} bytes`);

                // FORCE PROCESSING - UI Feedback
                statusText.innerText = 'Traitement...';
                statusText.style.color = '#4a9b87';

                try {
                    await processAudio(blob);
                } catch (e) {
                    console.error("Error in processAudio", e);
                    statusText.innerText = 'Erreur';
                }
            } else {
                console.error("❌ Audio was empty!");
                statusText.innerText = 'Audio Vide';
            }

            // 🔄 AUTO-RESTART LOOP (Crucial for Continuous Conversation)
            if (window.continuousMode) {
                // 🛑 CRITICAL FIX: DO NOT RESTART IF TTS IS PLAYING!
                if (isTTSPlaying && window.lastBotAudio) {
                    console.log("⏸️ TTS Playing - Waiting for audio to finish before restarting...");

                    // Chain the restart to the onended event
                    const originalEnded = window.lastBotAudio.onended;
                    window.lastBotAudio.onended = () => {
                        if (originalEnded) originalEnded();
                        console.log("✅ TTS Finished - Restarting conversation loop");
                        // Small delay to ensure clean state
                        setTimeout(() => {
                            if (window.continuousMode) listenContinuously();
                        }, 100);
                    };
                    return;
                } else {
                    // No audio playing, restart immediately
                    console.log("🔄 Auto-restarting conversation loop (No TTS active)...");
                    setTimeout(() => {
                        if (window.continuousMode) listenContinuously();
                    }, 100);
                }
            } else {
                statusText.innerText = 'Prêt';
            }
        };
        mediaRecorder.start();
        console.log("🎤 Recording started (with Auto-Stop)...");

    } catch (err) {
        console.error(err);
        statusText.innerText = "Erreur Micro";
        isRecording = false;
        recordBtn.classList.remove('active');
    }
}

function stopSmartRecording() {
    if (mediaRecorder && mediaRecorder.state !== 'inactive') mediaRecorder.stop();
    if (recognition) { try { recognition.stop(); } catch (e) { } }
    isRecording = false;
    recordBtn.classList.remove('active');
    statusText.innerText = 'Réflexion...';
}

// [Function setupRealTimeTranscription removed - Consolidated into startRealTimeTranscription]

function debouncedStreamTranslation(text) {
    if (streamTimeout) clearTimeout(streamTimeout);
    streamTimeout = setTimeout(() => performStreamTranslation(text), 200);
}

async function performStreamTranslation(text) {
    try {
        const res = await axios.post('/stream_text', {
            text: text,
            target_lang: quickLangSelector?.value || 'English'
        });
        if (res.data.translation) {
            translatedTextField.innerText = res.data.translation;

            // ✨ SHOW TRANSLATION CARD - Make it visible!
            if (res.data.translation.trim().length > 0) {
                translatedTextField.style.opacity = '1';
                console.log('🌍 Real-time translation:', res.data.translation);
            }
        }
    } catch (e) { console.error("Stream Error", e); }
}

// Helper function to analyze audio energy and detect silence
function analyzeAudioEnergy(blob) {
    return new Promise((resolve) => {
        const reader = new FileReader();
        reader.readAsArrayBuffer(blob);
        reader.onloadend = async () => {
            try {
                const audioContext = new (window.AudioContext || window.webkitAudioContext)();
                const audioBuffer = await audioContext.decodeAudioData(reader.result);

                // Get audio samples
                const channelData = audioBuffer.getChannelData(0);

                // Calculate RMS (Root Mean Square) energy
                let sum = 0;
                for (let i = 0; i < channelData.length; i++) {
                    sum += channelData[i] * channelData[i];
                }
                const rms = Math.sqrt(sum / channelData.length);

                // Calculate peak amplitude
                let peak = 0;
                for (let i = 0; i < channelData.length; i++) {
                    const abs = Math.abs(channelData[i]);
                    if (abs > peak) peak = abs;
                }

                // Duration in seconds
                const duration = audioBuffer.duration;

                console.log(`🔊 Audio Analysis: RMS=${rms.toFixed(4)}, Peak=${peak.toFixed(4)}, Duration=${duration.toFixed(2)}s`);

                // 🛡️ WAR MODE SENSITIVITY: Pick up even whispers (0.002)
                // Was 0.01 - Lowered to prevent cutting out during "Chaos"
                resolve({ rms, peak, duration, isSilent: rms < 0.002 && peak < 0.01 });
            } catch (e) {
                console.error('⚠️ Audio analysis failed:', e);
                resolve({ rms: 0, peak: 0, duration: 0, isSilent: true });
            }
        };
    });
}

async function processAudio(blob, bypassSilenceCheck = false) {
    // 🚀 PREVENT DUPLICATE PROCESSING
    if (isProcessingAudio) {
        console.log('⚠️ Audio already being processed, skipping...');
        return;
    }

    isProcessingAudio = true;
    recordBtn.classList.add('processing'); // 🔵 Visual Feedback: Blue Spinner
    recordBtn.classList.remove('active');   // Stop Red pulse
    recordBtn.classList.remove('active-speech'); // Stop Green pulse

    // 🔊 CRITICAL: SILENCE DETECTION - Prevent hallucination
    // ⚡ OPTIMIZATION: If we already confirmed speech in monitorAudio, skip this heavy decoding!
    if (!bypassSilenceCheck) {
        const audioAnalysis = await analyzeAudioEnergy(blob);

        // Reject if audio is too quiet (silence/background noise)
        if (audioAnalysis.isSilent) {
            console.warn('🔇 SILENCE DETECTED (Threshold check failed) - Skipping processing');
            console.log(`📊 Analysis: RMS=${audioAnalysis.rms}, Peak=${audioAnalysis.peak}`);
            statusText.innerText = 'Trop silencieux';
            isProcessingAudio = false;

            // Reset UI
            // ⚡ WAR MODE: Restart INSTANTLY (100ms) insead of 1s
            setTimeout(() => {
                statusText.innerText = 'Prêt';
                // Force restart if in continuous mode!
                if (window.continuousMode) listenContinuously();
            }, 100);
            return;
        }

        // Reject if audio is too short (likely just a click)
        if (audioAnalysis.duration < 0.5) {
            console.log(`⏱️ Audio too short (${audioAnalysis.duration.toFixed(2)}s) - Skipping`);
            statusText.innerText = 'Audio trop court';
            isProcessingAudio = false;

            setTimeout(() => {
                statusText.innerText = 'Prêt';
                if (window.continuousMode) listenContinuously();
            }, 800);
            return;
        }
    } else {
        console.log("⚡ SPEED: Bypassing secondary silence check (Speech already confirmed)");
    }

    console.log('✅ Audio validation passed - Processing...');

    const startTime = Date.now();
    const reader = new FileReader();
    reader.readAsDataURL(blob);
    reader.onloadend = async () => {
        const base64 = reader.result.split(',')[1];
        try {
            // 🚀 STEAL THE MICROPHONE (Client-Side STT Injection)
            // Use the global variable captured by Web Speech API directly!
            // This is cleaner than reading DOM.
            let textInput = (window.currentTranscript || originalTextField.innerText || "").trim();

            // Clean up placeholders
            textInput = textInput.replace('...', '').replace('🎤', '').trim();

            // Filter out placeholder indicators
            if (textInput.includes('Écoute') || textInput.length < 2) {
                textInput = ''; // Empty = backend will use Whisper/Gemini transcription
                console.log('🎯 Using backend STT only (no client text available)');
            } else {
                console.log(`🎤 Client-Side STT Injected: "${textInput}" (Skipping Server STT)`);
            }

            // Get languages from quick selectors
            const targetLangQuick = document.getElementById('target-lang-quick');
            const sourceLangQuick = document.getElementById('source-lang-quick');
            const selectedTarget = targetLangQuick?.value || quickLangSelector?.value || 'French';
            const selectedSource = sourceLangQuick?.value || 'auto';

            const settings = {
                audio: base64,
                text_input: textInput,  // Only send real transcribed text, not placeholders
                target_language: selectedTarget,
                source_language: selectedSource === 'auto' ? 'auto' : selectedSource, // Pass manual selection to backend
                stt_engine: localStorage.getItem('sttEngine') || 'openai-whisper', // ⚡ WHISPER (Requested by User)
                model: localStorage.getItem('aiModel') || 'gpt-4o-mini',  // ✅ CHATGPT (Requested by User)
                tts_engine: localStorage.getItem('ttsEngine') || 'seamless', // 🔊 SEAMLESS TTS (Kaggle GPU - FREE!)
                openai_api_key: localStorage.getItem('openaiKey'),
                google_api_key: localStorage.getItem('googleKey'),  // ✅ For Gemini STT
                openai_voice: localStorage.getItem('openaiVoice') || 'nova',
                elevenlabs_key: localStorage.getItem('elevenlabsKey'),  // Fixed: elevenlabs_key not elevenlabs_api_key
                use_grammar_correction: localStorage.getItem('grammarCorrectionEnabled') !== 'false',  // Default: enabled
                voice_gender_preference: localStorage.getItem('voiceGenderPreference') || 'auto'  // 🎙️ Voice gender: auto/male/female
            };

            console.log(`📝 Grammar Correction: ${settings.use_grammar_correction ? 'ENABLED (GPT)' : 'DISABLED (Direct Translation)'}`);
            console.log(`🎙️ Voice Gender Preference: ${settings.voice_gender_preference.toUpperCase()}`);


            // VOICE CLONING LOGIC - Check if enabled via toggle
            // 🚀 SPEED FIRST: Default is DISABLED for instant translations
            const voiceCloneEnabled = localStorage.getItem('voiceCloneEnabled') === 'true'; // Default: DISABLED
            const ttsEngine = settings.tts_engine;

            console.log(`🎭 Voice Cloning Status: ${voiceCloneEnabled ? 'ENABLED' : 'DISABLED'}`);

            // Send voice cloning data if enabled
            if (voiceCloneEnabled) {
                console.log('🎤 Voice Cloning ENABLED → Sending audio sample to server');
                settings.voice_audio = `data:audio/wav;base64,${base64}`;
                settings.voice_cloning = true;
            } else {
                console.log('🔇 Voice Cloning DISABLED → Using gender-matched fallback voices');
                settings.voice_cloning = false;
            }

            const res = await axios.post('/process_audio', settings);

            if (res.data.translated_text) {
                const translation = res.data.translated_text;
                const userText = settings.text_input;

                console.log('✅ Response received:', {
                    original: userText?.substring(0, 50),
                    translation: translation?.substring(0, 50),
                    hasAudio: !!res.data.tts_audio
                });

                // 🔊 FORCE DISPLAY RESULT (Fallback)
                const resultDisplay = document.getElementById('result-display');
                const originalDisplay = document.getElementById('original-display');
                const translationDisplay = document.getElementById('translation-display');
                const pronunciationDisplay = document.getElementById('pronunciation-display');
                const greeting = document.getElementById('greeting');

                if (resultDisplay && translationDisplay) {
                    if (greeting) greeting.style.display = 'none';
                    resultDisplay.style.display = 'block';
                    if (originalDisplay) originalDisplay.innerText = userText || 'Audio input';

                    // Pronunciation
                    if (pronunciationDisplay) {
                        const pronunciation = res.data.pronunciation;
                        if (pronunciation && pronunciation !== translation) {
                            pronunciationDisplay.innerText = pronunciation;
                            pronunciationDisplay.style.display = 'block';
                        } else {
                            pronunciationDisplay.style.display = 'none';
                        }
                    }

                    translationDisplay.innerText = translation;
                    console.log('📺 Result displayed on screen');
                }

                // 🔊 FORCE PLAY AUDIO
                if (res.data.tts_audio) {
                    const audioSrc = `data:audio/mp3;base64,${res.data.tts_audio}`;
                    const audio = new Audio(audioSrc);
                    audio.play().then(() => {
                        console.log('🔊 Audio playing!');
                    }).catch(err => {
                        console.log('❌ Auto-play blocked:', err);
                        // Show play button
                        if (translationDisplay) {
                            translationDisplay.innerHTML += ' <button onclick="this.previousSibling.click()" style="background:#4CAF50;color:white;border:none;padding:5px 10px;border-radius:5px;cursor:pointer;">▶️ Play</button>';
                        }
                    });
                    window.lastAudio = audio;
                }

                // 🛡️ HALLUCINATION CHECK - Block fake Whisper outputs
                // userText already defined above
                if (isHallucination(userText) || isHallucination(translation)) {
                    console.log(`🚫 HALLUCINATION DETECTED - Skipping message creation`);
                    console.log(`   User: "${userText}" | Translation: "${translation}"`);
                    statusText.innerText = 'Prêt';
                    isProcessingAudio = false;
                    recordBtn.classList.remove('processing');
                    return;
                }

                // AUTOMATIC LANGUAGE DETECTION - Update UI
                if (res.data.source_language_full && sourceLangSelector) {
                    const detectedLang = res.data.source_language_full;

                    // Store detected language for potential future auto-selection
                    detectedLanguage = detectedLang;
                    console.log(`🌍 Language auto-detected: ${detectedLang}`);

                    // Update real-time transcription language for next recording
                    if (recognition) {
                        const langMap = {
                            'English': 'en-US', 'French': 'fr-FR', 'Spanish': 'es-ES',
                            'German': 'de-DE', 'Italian': 'it-IT', 'Portuguese': 'pt-PT',
                            'Russian': 'ru-RU', 'Japanese': 'ja-JP', 'Korean': 'ko-KR',
                            'Chinese': 'zh-CN', 'Arabic': 'ar-SA', 'Hindi': 'hi-IN',
                            'Dutch': 'nl-NL', 'Polish': 'pl-PL', 'Turkish': 'tr-TR',
                            'Indonesian': 'id-ID', 'Malay': 'ms-MY', 'Thai': 'th-TH',
                            'Vietnamese': 'vi-VN', 'Bengali': 'bn-IN', 'Urdu': 'ur-PK',
                            'Swahili': 'sw-KE', 'Hebrew': 'he-IL', 'Persian': 'fa-IR',
                            'Ukrainian': 'uk-UA', 'Swedish': 'sv-SE', 'Greek': 'el-GR',
                            'Czech': 'cs-CZ', 'Romanian': 'ro-RO', 'Hungarian': 'hu-HU',
                            'Danish': 'da-DK', 'Finnish': 'fi-FI', 'Norwegian': 'no-NO',
                            'Slovak': 'sk-SK', 'Filipino': 'fil-PH', 'Amharic': 'am-ET'
                        };

                        const speechLang = langMap[detectedLang] || navigator.language || 'en-US';
                        console.log(`🎤 Speech recognition updated to: ${speechLang}`);
                    }
                }

                // Hide greeting
                const greetingEl = document.getElementById('greeting');
                if (greetingEl) greetingEl.style.display = 'none';

                // 2. Add User Message to Chat (with source language)
                // userText already defined above for hallucination check
                const sourceLang = res.data.source_language_full || 'Auto';
                const targetLang = res.data.target_language || 'Translation';
                createChatMessage('user', userText, null, null, sourceLang);

                // 3. Create NEW audio for this message
                let messageAudioSrc = null;
                if (res.data.tts_audio) {
                    messageAudioSrc = `data:audio/mp3;base64,${res.data.tts_audio}`;
                    // Play on global player
                    audioPlayer.src = messageAudioSrc;
                    audioPlayer.play().catch(err => {
                        console.log('Auto-play blocked:', err);
                    });
                }

                // 4. Add Bot Message with its OWN Audio Player (with target language)
                const info = {
                    latency: ((Date.now() - startTime) / 1000).toFixed(2),
                    stt: res.data.stt_engine,
                    translation: res.data.translation_engine,
                    tts: res.data.tts_engine
                };
                createChatMessage('bot', translation, messageAudioSrc, info, targetLang);

                // 🎙️ IMPORTANT: Update status based on mode
                if (window.continuousMode) {
                    // Keep button active in continuous mode
                    statusText.innerText = 'Écoute en continu...';
                    console.log('✅ TTS généré - En attente de la prochaine phrase');
                } else {
                    // Normal mode: reset button
                    isRecording = false;
                    recordBtn.classList.remove('active');
                    recordBtn.disabled = false;
                    statusText.innerText = 'Prêt';
                    console.log('✅ TTS généré - Bouton prêt');
                }
            }
        } catch (e) {
            console.error("Erreur de traitement:", e);
            statusText.innerText = "Erreur de connexion";

            // Re-enable button even on error
            isRecording = false;
            recordBtn.classList.remove('active');
            recordBtn.disabled = false;
        }
        finally {
            // Ensure button is always ready
            recordBtn.disabled = false;
            recordBtn.classList.remove('processing'); // 🔵 Stop Blue Spinner
            isProcessingAudio = false; // 🚀 Reset processing flag

            // If NOT continuous mode, ensure text says Ready
            if (!window.continuousMode) {
                statusText.innerText = 'Prêt';
            }
        }
    };
}

// Logic de sauvegarde/chargement des paramètres
window.loadModalSettings = () => {
    document.getElementById('stt-engine').value = localStorage.getItem('sttEngine') || 'openai-whisper';
    document.getElementById('openai-key').value = localStorage.getItem('openaiKey') || '';
    if (localStorage.getItem('sourceLang')) document.getElementById('source-lang-selector').value = localStorage.getItem('sourceLang');

    // 🎯 Set default target language for bidirectional translation
    const savedTargetLang = localStorage.getItem('targetLang');
    if (savedTargetLang && quickLangSelector) {
        quickLangSelector.value = savedTargetLang;
    } else if (quickLangSelector) {
        // Default to French for Arabic ↔ French bidirectional translation
        quickLangSelector.value = 'French';
        console.log('🌍 Default target language set to French for bidirectional translation');
    }
};

window.saveModalSettings = () => {
    localStorage.setItem('sttEngine', document.getElementById('stt-engine').value);
    localStorage.setItem('openaiKey', document.getElementById('openai-key').value);
    localStorage.setItem('targetLang', quickLangSelector.value);
    localStorage.setItem('sourceLang', document.getElementById('source-lang-selector').value);
};

// Removed: replay-trigger button (deleted from HTML)
// Functionality removed as button no longer exists

// ===================================
// 🛠️ BUTTON TOGGLE LOGIC (FIXED)
// ===================================

function setupToggle(id, storageKey, defaultValue, onToggle) {
    const btn = document.getElementById(id);
    if (!btn) return;

    // Load initial state
    const saved = localStorage.getItem(storageKey);
    const isActive = saved === null ? defaultValue : saved === 'true';

    if (isActive) btn.classList.add('active');
    else btn.classList.remove('active');

    btn.addEventListener('click', (e) => {
        e.stopPropagation(); // Prevent bubbling
        const currentlyActive = btn.classList.contains('active');
        const newState = !currentlyActive;

        // Toggle visual
        if (newState) btn.classList.add('active');
        else btn.classList.remove('active');

        // Save state
        localStorage.setItem(storageKey, newState);

        // Optional callback
        if (onToggle) onToggle(newState);

        console.log(`🔘 Toggle ${id}: ${newState ? 'ON' : 'OFF'}`);
    });
}

function setupCycle(id, storageKey, values, onCycle) {
    const btn = document.getElementById(id);
    if (!btn) return;

    // Load initial state
    let currentVal = localStorage.getItem(storageKey) || values[0];
    if (!values.includes(currentVal)) currentVal = values[0]; // Fallback

    const updateVisual = (val) => {
        // Remove all active classes first if needed, or just set generic active
        // For gender, we might want different icons? 
        // For now, simple active state if not default
        if (val !== values[0]) btn.classList.add('active');
        else btn.classList.remove('active');

        // Tooltip feedback
        btn.title = `Mode: ${val.toUpperCase()}`;
    };

    updateVisual(currentVal);

    btn.addEventListener('click', (e) => {
        e.stopPropagation();
        const currentIndex = values.indexOf(currentVal);
        const nextIndex = (currentIndex + 1) % values.length;
        currentVal = values[nextIndex];

        localStorage.setItem(storageKey, currentVal);
        updateVisual(currentVal);

        if (onCycle) onCycle(currentVal);
        console.log(`🔄 Cycle ${id}: ${currentVal}`);

        // Visual text feedback (Toast)
        statusText.innerText = `Mode: ${currentVal.toUpperCase()}`;
        setTimeout(() => statusText.innerText = 'Prêt', 1500);
    });
}

// 🎯 Initialize Toggles when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
    // 1. Magic/Grammar Toggle
    setupToggle('grammar-toggle', 'grammarCorrectionEnabled', true, (state) => {
        statusText.innerText = state ? '✨ Correction: ON' : '📝 Correction: OFF';
        setTimeout(() => statusText.innerText = 'Prêt', 1500);
    });

    // 2. Voice Gender Toggle (Auto -> Male -> Female)
    setupCycle('voice-gender-toggle', 'voiceGenderPreference', ['auto', 'male', 'female']);

    // 3. Smart Mode Toggle (Brain)
    setupToggle('smart-mode-toggle', 'smartModeEnabled', true, (state) => {
        statusText.innerText = state ? '🧠 Mode Smart: ON' : '🧠 Mode Smart: OFF';
        setTimeout(() => statusText.innerText = 'Prêt', 1500);
    });
});

// ⚙️ SETTINGS MODAL LOGIC (Fixing the "Broken Button")
document.addEventListener('DOMContentLoaded', () => {
    const settingsBtn = document.getElementById('settings-trigger'); // Found ID
    const closeSettingsBtn = document.getElementById('close-settings');
    const settingsModal = document.getElementById('settings-modal');

    // Open
    if (settingsBtn && settingsModal) {
        settingsBtn.addEventListener('click', () => {
            settingsModal.style.display = 'flex'; // Or remove hidden class
            // settingsModal.classList.remove('hidden'); // If using classes
            console.log('⚙️ Settings Opened');
        });
    } else {
        console.error('❌ Settings Trigger or Modal NOT FOUND');
    }

    // Close Button
    if (closeSettingsBtn && settingsModal) {
        closeSettingsBtn.addEventListener('click', () => {
            settingsModal.style.display = 'none';
        });
    }

    // Close on Outside Click
    window.addEventListener('click', (e) => {
        if (e.target === settingsModal) {
            settingsModal.style.display = 'none';
        }
    });

    // 💾 SAVE & LOAD LOGIC
    const saveBtn = document.getElementById('save-settings');
    const aiSelector = document.getElementById('ai-model-selector');
    const ttsSelector = document.getElementById('tts-selector');

    // Load Initial Values
    if (aiSelector) aiSelector.value = localStorage.getItem('aiModel') || 'gpt-4o-mini';
    if (ttsSelector) ttsSelector.value = localStorage.getItem('ttsEngine') || 'openai';

    // Save Handler
    if (saveBtn) {
        saveBtn.addEventListener('click', () => {
            if (aiSelector) {
                localStorage.setItem('aiModel', aiSelector.value);
                console.log(`🧠 AI Model set to: ${aiSelector.value}`);
            }
            if (ttsSelector) {
                localStorage.setItem('ttsEngine', ttsSelector.value);
                console.log(`🗣️ TTS Engine set to: ${ttsSelector.value}`);
            }

            // Close Modal
            if (settingsModal) settingsModal.style.display = 'none';

            // Feedback
            if (statusText) {
                statusText.innerText = '✅ Sauvegardé!';
                setTimeout(() => statusText.innerText = 'Prêt', 2000);
            }
        });
    }
});


// 🎯 Initialize language settings on page load
document.addEventListener('DOMContentLoaded', () => {
    // Set default target language for bidirectional translation
    if (quickLangSelector) {
        const savedTargetLang = localStorage.getItem('targetLang');
        if (savedTargetLang) {
            quickLangSelector.value = savedTargetLang;
            console.log(`🌍 Loaded saved target language: ${savedTargetLang}`);
        } else {
            quickLangSelector.value = 'French';
            console.log('🌍 Default target language set to French for Arabic ↔ French bidirectional translation');
        }
    }

    // Set source to auto for automatic detection
    const sourceLangSelector = document.getElementById('source-lang-selector');
    if (sourceLangSelector) {
        sourceLangSelector.value = 'auto';
        console.log('🎯 Source language set to AUTO for automatic detection');

        // 🔄 HARD SYNC: If user changes Source, clear "Smart History" to prevent confusion
        sourceLangSelector.addEventListener('change', function () {
            console.log('🔄 Source Language Changed -> Clearing Smart History...');
            localStorage.setItem('sourceLang', this.value);
            fetch('/clear_cache', { method: 'POST' });
        });
    }

    // 🔄 HARD SYNC: If user changes Target, clear "Smart History" to prevent confusion
    if (quickLangSelector) {
        quickLangSelector.addEventListener('change', function () {
            console.log('🔄 Target Language Changed -> Clearing Smart History...');
            localStorage.setItem('targetLang', this.value);
            fetch('/clear_cache', { method: 'POST' });
        });
    }

    // ===================================
    // 🎭 VOICE CLONING TOGGLE
    // ===================================
    let voiceCloneEnabled = localStorage.getItem('voiceCloneEnabled') !== 'false'; // Default: ON

    const voiceCloneToggle = document.getElementById('voice-clone-toggle');
    if (voiceCloneToggle) {
        // Set initial state
        if (voiceCloneEnabled) {
            voiceCloneToggle.classList.add('active');
        } else {
            voiceCloneToggle.classList.remove('active');
        }

        // Toggle on click
        voiceCloneToggle.addEventListener('click', function () {
            voiceCloneEnabled = !voiceCloneEnabled;
            localStorage.setItem('voiceCloneEnabled', voiceCloneEnabled);

            if (voiceCloneEnabled) {
                this.classList.add('active');
                console.log('🎭 Voice Cloning: ON');
            } else {
                this.classList.remove('active');
                console.log('🎭 Voice Cloning: OFF');
            }
        });
    }

});