// Telegram Mini-Game Development Research Page Interactivity

class TelegramGameResearch {
    constructor() {
        this.sections = document.querySelectorAll('.research-section');
        this.init();
    }

    init() {
        this.initializeIntersectionObserver();
        this.initializeCountUpAnimations();
        this.initializeTooltips();
        this.initializeCopyCodeBlocks();
        this.initializeProgressTracker();
        this.initializeKeywordHighlighter();
    }

    initializeIntersectionObserver() {
        const observer = new IntersectionObserver((entries) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    entry.target.style.opacity = '1';
                    entry.target.style.transform = 'translateY(0)';
                    
                    // Animate child elements with staggered delay
                    const childElements = entry.target.querySelectorAll('.animate-child');
                    childElements.forEach((el, index) => {
                        el.style.transitionDelay = `${index * 0.1}s`;
                        el.classList.add('animated');
                    });
                }
            });
        }, {
            threshold: 0.1,
            rootMargin: '0px 0px -50px 0px'
        });

        this.sections.forEach(section => {
            section.style.opacity = '0';
            section.style.transform = 'translateY(20px)';
            section.style.transition = 'opacity 0.6s ease, transform 0.6s ease';
            observer.observe(section);
        });
    }

    initializeCountUpAnimations() {
        const stats = [
            { element: '.stat-1', value: 15000000, suffix: '+' },
            { element: '.stat-2', value: 800000000, suffix: '+' },
            { element: '.stat-3', value: 94, suffix: '%' },
            { element: '.stat-4', value: 2.3, suffix: 'B' }
        ];

        stats.forEach(stat => {
            const element = document.querySelector(stat.element);
            if (!element) return;

            const observer = new IntersectionObserver((entries) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        this.animateCountUp(element, stat.value, stat.suffix);
                        observer.unobserve(element);
                    }
                });
            });

            observer.observe(element);
        });
    }

    animateCountUp(element, target, suffix) {
        const duration = 2000;
        const startTime = Date.now();
        const startValue = 0;
        
        const animate = () => {
            const currentTime = Date.now();
            const elapsed = currentTime - startTime;
            const progress = Math.min(elapsed / duration, 1);
            
            let currentValue;
            if (suffix === '%' || suffix === 'B') {
                currentValue = startValue + (target - startValue) * progress;
                element.textContent = currentValue.toFixed(suffix === 'B' ? 1 : 0) + suffix;
            } else {
                currentValue = Math.floor(startValue + (target - startValue) * progress);
                element.textContent = this.formatNumber(currentValue) + suffix;
            }
            
            if (progress < 1) {
                requestAnimationFrame(animate);
            }
        };
        
        requestAnimationFrame(animate);
    }

    formatNumber(num) {
        if (num >= 1000000) {
            return (num / 1000000).toFixed(1) + 'M';
        } else if (num >= 1000) {
            return (num / 1000).toFixed(1) + 'K';
        }
        return num.toString();
    }

    initializeTooltips() {
        // Initialize tooltips for technical terms
        const tooltips = document.querySelectorAll('[data-tooltip]');
        
        tooltips.forEach(element => {
            const tooltipText = element.getAttribute('data-tooltip');
            const tooltip = document.createElement('div');
            tooltip.className = 'absolute hidden bg-gray-900 text-white px-3 py-2 rounded-lg text-sm z-50 whitespace-nowrap';
            tooltip.textContent = tooltipText;
            
            // Position calculation
            const updatePosition = () => {
                const rect = element.getBoundingClientRect();
                tooltip.style.left = `${rect.left + rect.width / 2 - tooltip.offsetWidth / 2}px`;
                tooltip.style.top = `${rect.top - tooltip.offsetHeight - 10}px`;
            };
            
            element.addEventListener('mouseenter', () => {
                document.body.appendChild(tooltip);
                tooltip.classList.remove('hidden');
                updatePosition();
            });
            
            element.addEventListener('mouseleave', () => {
                tooltip.remove();
            });
        });
    }

    initializeCopyCodeBlocks() {
        const codeBlocks = document.querySelectorAll('.code-snippet pre');
        
        codeBlocks.forEach(block => {
            const copyButton = document.createElement('button');
            copyButton.className = 'absolute top-4 right-4 text-gray-400 hover:text-white transition-colors';
            copyButton.innerHTML = '<i data-feather="copy" class="w-5 h-5"></i>';
            
            block.parentNode.style.position = 'relative';
            block.parentNode.appendChild(copyButton);
            
            copyButton.addEventListener('click', async () => {
                const code = block.textContent;
                try {
                    await navigator.clipboard.writeText(code);
                    
                    // Visual feedback
                    const originalIcon = copyButton.innerHTML;
                    copyButton.innerHTML = '<i data-feather="check" class="w-5 h-5 text-green-500"></i>';
                    
                    setTimeout(() => {
                        copyButton.innerHTML = originalIcon;
                        feather.replace();
                    }, 2000);
                } catch (err) {
                    console.error('Failed to copy code:', err);
                }
            });
        });
    }

    initializeProgressTracker() {
        const progressBar = document.createElement('div');
        progressBar.className = 'fixed top-0 left-0 h-1 bg-gradient-to-r from-primary-500 to-secondary-500 z-50 transition-all duration-150';
        progressBar.style.width = '0%';
        document.body.appendChild(progressBar);
        
        window.addEventListener('scroll', () => {
            const windowHeight = document.documentElement.scrollHeight - document.documentElement.clientHeight;
            const scrolled = (window.scrollY / windowHeight) * 100;
            progressBar.style.width = `${scrolled}%`;
        });
    }

    initializeKeywordHighlighter() {
        // SEO-related keyword highlighting
        const keywords = [
            'Telegram Mini-Game', 'Bot API', 'Web App', 'HTML5 Games',
            'JavaScript', 'Phaser', 'PixiJS', 'Monetization',
            'Telegram Features', 'Gaming SEO', 'Real-time', 'Multiplayer'
        ];
        
        const content = document.querySelector('.research-content');
        if (!content) return;
        
        keywords.forEach(keyword => {
            const regex = new RegExp(`\\b(${keyword})\\b`, 'gi');
            content.innerHTML = content.innerHTML.replace(regex, 
                `<span class="keyword-highlight">$1</span>`
            );
        });
    }

    // Utility function for API data fetching (example)
    async fetchTelegramStats() {
        try {
            // This would be a real API call in production
            // const response = await fetch('https://api.telegram.org/stats');
            // return await response.json();
            
            // Mock data for demonstration
            return {
                dailyUsers: 15000000,
                retentionRate: 94,
                revenuePotential: 2.3
            };
        } catch (error) {
            console.error('Failed to fetch Telegram stats:', error);
            return null;
        }
    }

    // Initialize search functionality
    initializeSearch() {
        const searchInput = document.createElement('input');
        searchInput.type = 'text';
        searchInput.placeholder = 'Search topics (e.g., API, Monetization, SEO)...';
        searchInput.className = 'fixed top0 right-4 z-50 bg-white shadow-xl border-gray-300 rounded-lg px-4 py-2 focus:outline-none focus:ring-2 focus:ring-blue-500';
        
        document.body.appendChild(searchInput);
        
        searchInput.addEventListener('input', (e) => {
            const searchTerm = e.target.value.toLowerCase();
            
            this.sections.forEach(section => {
                const text = section.textContent.toLowerCase();
                const isMatch = text.includes(searchTerm);
                section.style.opacity = isMatch ? '1' : '0.3';
                section.style.pointerEvents = isMatch ? 'auto' : 'none';
            });
        });
    }
}

// Initialize when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    const researchPage = new TelegramGameResearch();
    
    // Initialize search if needed
    // researchPage.initializeSearch();
    
    // Update stats from mock API
    researchPage.fetchTelegramStats().then(stats => {
        if (stats) {
            console.log('Telegram Gaming Stats:', stats);
        }
    });
    
    // Add keyboard shortcuts
    document.addEventListener('keydown', (e) => {
        // Ctrl/Cmd + F focuses search
        if ((e.ctrlKey || e.metaKey) && e.key === 'f') {
            e.preventDefault();
            // Focus search input if exists
            const searchInput = document.querySelector('input[placeholder*="Search"]');
            if (searchInput) searchInput.focus();
        }
        
        // Escape to clear search
        if (e.key === 'Escape') {
            const searchInput = document.querySelector('input[placeholder*="Search"]');
            if (searchInput) searchInput.value = '';
        }
    });
});

// Enhanced analytics tracking
window.dataLayer = window.dataLayer || [];
function gtag() { dataLayer.push(arguments); }
gtag('js', new Date());
gtag('config', 'G-XXXXX'); // Replace with actual Analytics ID

// Performance monitoring
if ('performance' in window) {
    const timing = performance.timing;
    const pageLoadTime = timing.loadEventEnd - timing.navigationStart;
    console.log(`Page loaded in ${pageLoadTime}ms`);
    
    // Send to analytics if needed
    gtag('event', 'page_load_time', {
        value: pageLoadTime,
        metric_id: 'page_load'
    });
}

// Lazy loading for images
document.addEventListener('DOMContentLoaded', () => {
    const lazyImages = document.querySelectorAll('img[data-src]');
    
    const imageObserver = new IntersectionObserver((entries, observer) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const img = entry.target;
                img.src = img.dataset.src;
                img.removeAttribute('data-src');
                observer.unobserve(img);
            }
        });
    });
    
    lazyImages.forEach(img => imageObserver.observe(img));
});