/**
 * ════════════════════════════════════════════════════════════════════════
 * LinguaVerify AI v5.1 - COMPLETE PRODUCTION JAVASCRIPT
 * Frontend Logic • Text Visibility FIXED • All Features Working
 * Author: Your Name | Date: Oct 2025 | Version: 5.1
 * ════════════════════════════════════════════════════════════════════════
 */

// ════════════════════════════════════════════════════════════════════════
// GLOBAL STATE
// ════════════════════════════════════════════════════════════════════════

let currentResult = null;

// Language names mapping
const LANGUAGE_NAMES = {
    'en': 'English', 'es': 'Spanish', 'fr': 'French', 'de': 'German',
    'hi': 'Hindi', 'ar': 'Arabic', 'zh': 'Chinese', 'ja': 'Japanese',
    'ko': 'Korean', 'ru': 'Russian', 'pt': 'Portuguese', 'it': 'Italian',
    'nl': 'Dutch', 'tr': 'Turkish', 'pl': 'Polish', 'th': 'Thai',
    'vi': 'Vietnamese', 'id': 'Indonesian', 'ta': 'Tamil', 'te': 'Telugu',
    'bn': 'Bengali', 'ur': 'Urdu', 'fa': 'Persian', 'he': 'Hebrew',
    'mr': 'Marathi', 'gu': 'Gujarati', 'kn': 'Kannada', 'ml': 'Malayalam',
    'pa': 'Punjabi', 'si': 'Sinhala', 'ne': 'Nepali', 'my': 'Burmese',
    'km': 'Khmer', 'lo': 'Lao', 'am': 'Amharic', 'sw': 'Swahili',
    'unknown': 'Unknown'
};

// Example datasets
const examples = {
    1: {
        title_a: "Deep Learning for Medical Diagnosis",
        title_b: "चिकित्सा निदान के लिए डीप लर्निंग",
        domain: "medicine"
    },
    2: {
        title_a: "Climate Change Impact on Agriculture",
        title_b: "Impacto del Cambio Climático en la Agricultura",
        domain: "climate_change"
    },
    3: {
        title_a: "Artificial Intelligence Research and Development",
        title_b: "بحث وتطوير الذكاء الاصطناعي",
        domain: "artificial_intelligence"
    }
};

// ════════════════════════════════════════════════════════════════════════
// INITIALIZATION
// ════════════════════════════════════════════════════════════════════════

document.addEventListener('DOMContentLoaded', () => {
    console.log('%c🧠 LinguaVerify AI v5.1 - PRODUCTION READY', 
        'color: #a78bfa; font-size: 16px; font-weight: bold; background: #1a1f3a; padding: 10px; border-radius: 5px;');
    console.log('%c✨ All Features Active', 'color: #10b981; font-size: 12px;');
    
    initializeApp();
    setupEventListeners();
    checkSystemHealth();
    fixInputVisibility();
    
    console.log('%c⌨️ Keyboard Shortcuts:', 'color: #a78bfa; font-weight: bold;');
    console.log('   Ctrl/Cmd + Enter: Verify titles');
    console.log('   Esc: Clear results');
});

// ════════════════════════════════════════════════════════════════════════
// TEXT VISIBILITY FIX (CRITICAL)
// ════════════════════════════════════════════════════════════════════════

function fixInputVisibility() {
    const inputs = document.querySelectorAll('.luxury-input, .luxury-select');
    inputs.forEach(input => {
        // Set text color
        input.style.color = '#ffffff';
        input.style.webkitTextFillColor = '#ffffff';
        
        // Fix on input event
        input.addEventListener('input', function() {
            this.style.color = '#ffffff';
            this.style.webkitTextFillColor = '#ffffff';
        });
        
        // Fix on focus
        input.addEventListener('focus', function() {
            this.style.color = '#ffffff';
            this.style.webkitTextFillColor = '#ffffff';
        });
        
        // Fix on blur
        input.addEventListener('blur', function() {
            this.style.color = '#ffffff';
            this.style.webkitTextFillColor = '#ffffff';
        });
    });
    
    console.log('✅ Input visibility enforced');
}

// ════════════════════════════════════════════════════════════════════════
// APP INITIALIZATION
// ════════════════════════════════════════════════════════════════════════

function initializeApp() {
    const titleA = document.getElementById('title_a');
    const titleB = document.getElementById('title_b');
    
    if (titleA) {
        updateCharCount('title_a', 'char_count_a');
        detectLanguageRealtime('title_a', 'detected_lang_a', 'lang_badge_a');
        
        titleA.addEventListener('input', () => {
            updateCharCount('title_a', 'char_count_a');
            detectLanguageRealtime('title_a', 'detected_lang_a', 'lang_badge_a');
        });
    }
    
    if (titleB) {
        updateCharCount('title_b', 'char_count_b');
        detectLanguageRealtime('title_b', 'detected_lang_b', 'lang_badge_b');
        
        titleB.addEventListener('input', () => {
            updateCharCount('title_b', 'char_count_b');
            detectLanguageRealtime('title_b', 'detected_lang_b', 'lang_badge_b');
        });
    }
}

// ════════════════════════════════════════════════════════════════════════
// EVENT LISTENERS
// ════════════════════════════════════════════════════════════════════════

function setupEventListeners() {
    // Keyboard shortcuts
    document.addEventListener('keydown', (e) => {
        // Ctrl/Cmd + Enter to verify
        if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
            e.preventDefault();
            verifyTitles();
        }
        
        // Escape to clear results
        if (e.key === 'Escape') {
            const results = document.getElementById('results');
            if (results && results.style.display !== 'none') {
                hideResults();
                showNotification('Results cleared', 'info');
            }
        }
    });
}

// ════════════════════════════════════════════════════════════════════════
// CHARACTER COUNTING
// ════════════════════════════════════════════════════════════════════════

function updateCharCount(textareaId, countId) {
    const textarea = document.getElementById(textareaId);
    const counter = document.getElementById(countId);
    
    if (textarea && counter) {
        const length = textarea.value.length;
        counter.textContent = `${length} char${length !== 1 ? 's' : ''}`;
        
        // Change color if too long
        if (length > 500) {
            counter.style.color = '#f59e0b';
        } else {
            counter.style.color = 'rgba(255, 255, 255, 0.4)';
        }
    }
}

// ════════════════════════════════════════════════════════════════════════
// REAL-TIME LANGUAGE DETECTION
// ════════════════════════════════════════════════════════════════════════

let languageDetectionTimeouts = {};

function detectLanguageRealtime(textareaId, langSpanId, badgeId) {
    const textarea = document.getElementById(textareaId);
    const langSpan = document.getElementById(langSpanId);
    const badge = document.getElementById(badgeId);
    
    if (!textarea || !langSpan || !badge) return;
    
    const text = textarea.value.trim();
    
    // Handle empty input
    if (!text) {
        langSpan.textContent = 'Waiting...';
        badge.style.background = 'rgba(139, 92, 246, 0.15)';
        badge.style.borderColor = 'rgba(139, 92, 246, 0.25)';
        badge.style.color = '#a78bfa';
        return;
    }
    
    // Show detecting state
    langSpan.textContent = 'Detecting...';
    badge.style.background = 'rgba(59, 130, 246, 0.15)';
    badge.style.borderColor = 'rgba(59, 130, 246, 0.25)';
    badge.style.color = '#60a5fa';
    
    // Clear previous timeout
    if (languageDetectionTimeouts[textareaId]) {
        clearTimeout(languageDetectionTimeouts[textareaId]);
    }
    
    // Debounce API call
    languageDetectionTimeouts[textareaId] = setTimeout(() => {
        fetch('/detect_language', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ text: text })
        })
        .then(response => response.json())
        .then(data => {
            const langName = LANGUAGE_NAMES[data.language] || data.language.toUpperCase();
            const confidence = Math.round(data.confidence * 100);
            
            langSpan.textContent = `${langName} (${confidence}%)`;
            badge.style.background = 'rgba(16, 185, 129, 0.15)';
            badge.style.borderColor = 'rgba(16, 185, 129, 0.25)';
            badge.style.color = '#34d399';
        })
        .catch(error => {
            console.error('Language detection error:', error);
            langSpan.textContent = 'Auto-detect';
            badge.style.background = 'rgba(239, 68, 68, 0.15)';
            badge.style.borderColor = 'rgba(239, 68, 68, 0.25)';
            badge.style.color = '#f87171';
        });
    }, 500); // 500ms debounce
}

// ════════════════════════════════════════════════════════════════════════
// EXAMPLE LOADING
// ════════════════════════════════════════════════════════════════════════

function loadExample(id) {
    const example = examples[id];
    if (!example) {
        showNotification('Example not found', 'error');
        return;
    }
    
    const titleA = document.getElementById('title_a');
    const titleB = document.getElementById('title_b');
    const domain = document.getElementById('domain');
    
    if (titleA && titleB && domain) {
        // Set values
        titleA.value = example.title_a;
        titleB.value = example.title_b;
        domain.value = example.domain;
        
        // Force text visibility
        titleA.style.color = '#ffffff';
        titleB.style.color = '#ffffff';
        titleA.style.webkitTextFillColor = '#ffffff';
        titleB.style.webkitTextFillColor = '#ffffff';
        
        // Update UI
        updateCharCount('title_a', 'char_count_a');
        updateCharCount('title_b', 'char_count_b');
        detectLanguageRealtime('title_a', 'detected_lang_a', 'lang_badge_a');
        detectLanguageRealtime('title_b', 'detected_lang_b', 'lang_badge_b');
        
        // Auto-verify after 1 second
        setTimeout(() => verifyTitles(), 1000);
        
        showNotification('✅ Example loaded successfully', 'success');
    }
}

// ════════════════════════════════════════════════════════════════════════
// MAIN VERIFICATION FUNCTION
// ════════════════════════════════════════════════════════════════════════

async function verifyTitles() {
    const titleA = document.getElementById('title_a')?.value.trim();
    const titleB = document.getElementById('title_b')?.value.trim();
    const domain = document.getElementById('domain')?.value;
    const enableTranslation = document.getElementById('enable_translation')?.checked;
    
    // Validation
    if (!titleA || !titleB) {
        showNotification('⚠️ Please enter both titles', 'warning');
        return;
    }
    
    // Set loading state
    setLoadingState(true);
    hideResults();
    
    try {
        const response = await fetch('/verify', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ 
                title_a: titleA, 
                title_b: titleB, 
                domain: domain,
                enable_translation: enableTranslation
            })
        });
        
        if (!response.ok) {
            const errorData = await response.json();
            throw new Error(errorData.error || `HTTP ${response.status}`);
        }
        
        const result = await response.json();
        currentResult = result;
        
        // Display results with animation delay
        setTimeout(() => {
            displayResults(result, domain, enableTranslation);
        }, 300);
        
        showNotification('✅ Analysis complete', 'success');
        
    } catch (error) {
        console.error('Verification error:', error);
        showNotification('❌ Error: ' + error.message, 'error');
    } finally {
        setLoadingState(false);
    }
}

// ════════════════════════════════════════════════════════════════════════
// LOADING STATE MANAGEMENT
// ════════════════════════════════════════════════════════════════════════

function setLoadingState(isLoading) {
    const btnContent = document.getElementById('btn-content');
    const btnLoader = document.getElementById('btn-loader');
    const button = document.querySelector('.btn-primary-gradient');
    
    if (btnContent && btnLoader && button) {
        if (isLoading) {
            btnContent.style.display = 'none';
            btnLoader.style.display = 'flex';
            button.disabled = true;
            button.style.opacity = '0.7';
            button.style.cursor = 'not-allowed';
        } else {
            btnContent.style.display = 'flex';
            btnLoader.style.display = 'none';
            button.disabled = false;
            button.style.opacity = '1';
            button.style.cursor = 'pointer';
        }
    }
}

// ════════════════════════════════════════════════════════════════════════
// DISPLAY RESULTS
// ════════════════════════════════════════════════════════════════════════

function displayResults(result, domain, translationEnabled) {
    const resultsPanel = document.getElementById('results');
    if (!resultsPanel) return;
    
    // Show results panel
    resultsPanel.style.display = 'block';
    
    // Smooth scroll to results
    setTimeout(() => {
        resultsPanel.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
    }, 100);
    
    // Update decision badge
    const badge = document.getElementById('decision-badge');
    if (badge) {
        badge.textContent = result.label.replace('_', ' ');
        badge.className = 'decision-badge-luxury ' + 
            (result.label === 'EQUIVALENT' ? 'equivalent' : 'not-equivalent');
    }
    
    // Update translation panel
    const translationPanel = document.getElementById('translation-panel');
    if (translationEnabled && result.translations && translationPanel) {
        translationPanel.style.display = 'block';
        
        // Translation A
        const transA = result.translations.title_a;
        if (transA) {
            document.getElementById('trans_lang_a').textContent = 
                (transA.src_lang || 'auto').toUpperCase();
            document.getElementById('trans_original_a').textContent = transA.original_text;
            document.getElementById('trans_result_a').textContent = transA.translated_text;
        }
        
        // Translation B
        const transB = result.translations.title_b;
        if (transB) {
            document.getElementById('trans_lang_b').textContent = 
                (transB.src_lang || 'auto').toUpperCase();
            document.getElementById('trans_original_b').textContent = transB.original_text;
            document.getElementById('trans_result_b').textContent = transB.translated_text;
        }
    } else if (translationPanel) {
        translationPanel.style.display = 'none';
    }
    
    // Animate metrics
    animateMetric('final-score', result.final_score, 3);
    animateMetric('embedding-score', result.embedding_score, 3);
    
    animateProgressBar('progress-final', result.final_score * 100);
    animateProgressBar('progress-embed', result.embedding_score * 100);
    
    // Translation score (if available)
    const translationScoreCard = document.getElementById('translation-score-card');
    const translationScoreValue = document.getElementById('translation-score');
    if (result.translation_score !== null && translationScoreCard && translationScoreValue) {
        translationScoreCard.style.display = 'block';
        animateMetric('translation-score', result.translation_score, 3);
        animateProgressBar('progress-trans', result.translation_score * 100);
    } else if (translationScoreCard) {
        translationScoreCard.style.display = 'none';
    }
    
    // Update other metrics
    document.getElementById('confidence').textContent = result.confidence;
    document.getElementById('processing-time').textContent = result.traces.total_time_ms + 'ms';
    document.getElementById('method').textContent = 
        (result.method || 'labse_only').replace(/_/g, ' ').toUpperCase();
    
    // Language detection
    const langs = result.detected_languages;
    document.getElementById('lang_detect_a').textContent = 
        LANGUAGE_NAMES[langs.title_a] || langs.title_a.toUpperCase();
    document.getElementById('lang_detect_b').textContent = 
        LANGUAGE_NAMES[langs.title_b] || langs.title_b.toUpperCase();
    document.getElementById('lang_conf_a').textContent = 
        Math.round(langs.confidence_a * 100) + '%';
    document.getElementById('lang_conf_b').textContent = 
        Math.round(langs.confidence_b * 100) + '%';
    
    // Metadata
    const domainFormatted = domain.replace(/_/g, ' ').replace(/\b\w/g, l => l.toUpperCase());
    document.getElementById('domain-display').textContent = domainFormatted;
    document.getElementById('threshold').textContent = result.adjusted_threshold.toFixed(3);
}

// ════════════════════════════════════════════════════════════════════════
// ANIMATED COUNTERS
// ════════════════════════════════════════════════════════════════════════

function animateMetric(elementId, targetValue, decimals = 0) {
    const element = document.getElementById(elementId);
    if (!element) return;
    
    const duration = 1000; // 1 second
    const startValue = 0;
    const increment = (targetValue - startValue) / (duration / 16);
    let currentValue = startValue;
    
    const counter = setInterval(() => {
        currentValue += increment;
        if (currentValue >= targetValue) {
            currentValue = targetValue;
            clearInterval(counter);
        }
        element.textContent = currentValue.toFixed(decimals);
    }, 16); // ~60fps
}

function animateProgressBar(elementId, targetWidth) {
    const element = document.getElementById(elementId);
    if (!element) return;
    
    // Start from 0
    element.style.width = '0%';
    
    // Animate to target
    setTimeout(() => {
        element.style.width = Math.min(targetWidth, 100) + '%';
    }, 100);
}

// ════════════════════════════════════════════════════════════════════════
// UTILITY FUNCTIONS
// ════════════════════════════════════════════════════════════════════════

function hideResults() {
    const resultsPanel = document.getElementById('results');
    if (resultsPanel) {
        resultsPanel.style.display = 'none';
    }
}

function showNotification(message, type = 'info') {
    const notification = document.createElement('div');
    notification.className = `notification notification-${type}`;
    notification.textContent = message;
    
    // Styling
    Object.assign(notification.style, {
        position: 'fixed',
        top: '100px',
        right: '20px',
        padding: '1rem 1.5rem',
        borderRadius: '12px',
        color: 'white',
        fontSize: '0.9rem',
        fontWeight: '500',
        zIndex: '10000',
        opacity: '0',
        transform: 'translateX(400px)',
        transition: 'all 0.3s cubic-bezier(0.4, 0, 0.2, 1)',
        boxShadow: '0 8px 32px rgba(0, 0, 0, 0.3)',
        backdropFilter: 'blur(10px)'
    });
    
    // Type-specific colors
    if (type === 'success') {
        notification.style.background = 'linear-gradient(135deg, rgba(16, 185, 129, 0.9), rgba(5, 150, 105, 0.9))';
    } else if (type === 'error') {
        notification.style.background = 'linear-gradient(135deg, rgba(239, 68, 68, 0.9), rgba(220, 38, 38, 0.9))';
    } else if (type === 'warning') {
        notification.style.background = 'linear-gradient(135deg, rgba(245, 158, 11, 0.9), rgba(217, 119, 6, 0.9))';
    } else {
        notification.style.background = 'linear-gradient(135deg, rgba(59, 130, 246, 0.9), rgba(37, 99, 235, 0.9))';
    }
    
    document.body.appendChild(notification);
    
    // Slide in
    setTimeout(() => {
        notification.style.opacity = '1';
        notification.style.transform = 'translateX(0)';
    }, 10);
    
    // Slide out and remove
    setTimeout(() => {
        notification.style.opacity = '0';
        notification.style.transform = 'translateX(400px)';
        setTimeout(() => notification.remove(), 300);
    }, 3000);
}

// ════════════════════════════════════════════════════════════════════════
// SYSTEM HEALTH CHECK
// ════════════════════════════════════════════════════════════════════════

async function checkSystemHealth() {
    try {
        const response = await fetch('/health');
        const data = await response.json();
        
        console.log('%c🟢 System Health:', 'color: #10b981; font-weight: bold;');
        console.log('   Status:', data.status);
        console.log('   Version:', data.version);
        console.log('   Models:', data.models);
        console.log('   Cache:', data.cache_size);
        console.log('   Device:', data.device);
        
    } catch (error) {
        console.warn('%c⚠️ Could not fetch health status:', 'color: #f59e0b;', error);
    }
}

// ════════════════════════════════════════════════════════════════════════
// GLOBAL EXPORTS
// ════════════════════════════════════════════════════════════════════════

window.verifyTitles = verifyTitles;
window.loadExample = loadExample;
window.hideResults = hideResults;

// ════════════════════════════════════════════════════════════════════════
// CONSOLE BRANDING
// ════════════════════════════════════════════════════════════════════════

console.log('%c━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━', 'color: #a78bfa;');
console.log('%c🧠 LinguaVerify AI v5.1 - Production Ready', 'color: #10b981; font-size: 14px; font-weight: bold;');
console.log('%c200+ Languages • Dual-Path AI • Text Visibility Fixed ✅', 'color: #10b981; font-size: 11px;');
console.log('%c━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━', 'color: #a78bfa;');
console.log('%cDeveloped with ❤️ by Your Name', 'color: #60a5fa; font-size: 10px;');
console.log('%c━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━', 'color: #a78bfa;');