// Interactive elements for TN Medical Connect

document.addEventListener('DOMContentLoaded', function () {
    // Initialize all interactive components
    initAnimations();
    initCounters();
    initCarousels();
    initFlipCards();
    initDarkMode();
    initFilterSystem();
    initScrollReveal();
    initScrollToTop();

    // Add event listeners for interactive features
    document.querySelectorAll('.collapsible-content').forEach(setupCollapsible);
    document.querySelectorAll('.tabs-container').forEach(setupTabs);
});

// === SCROLL-BASED FADE-IN ===
function initScrollReveal() {
    const animatedElements = document.querySelectorAll('.fade-in, .fade-in-up, .fade-in-left, .fade-in-right');

    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.classList.add('visible'); // ✅ USES .visible NOW
                observer.unobserve(entry.target);
            }
        });
    }, { threshold: 0.1 });

    animatedElements.forEach(element => {
        element.style.opacity = 0;
        observer.observe(element);
    });
}

// === COUNTER ANIMATIONS ===
function initCounters() {
    const counterElements = document.querySelectorAll('.counter-animation');

    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const target = parseInt(entry.target.getAttribute('data-target'), 10);
                const duration = parseInt(entry.target.getAttribute('data-duration') || 2000, 10);
                let startTime = null;

                function updateCounter(timestamp) {
                    if (!startTime) startTime = timestamp;
                    const elapsed = timestamp - startTime;
                    const progress = Math.min(elapsed / duration, 1);
                    const currentCount = Math.floor(progress * target);
                    entry.target.textContent = currentCount.toLocaleString();

                    if (progress < 1) {
                        requestAnimationFrame(updateCounter);
                    }
                }

                requestAnimationFrame(updateCounter);
                observer.unobserve(entry.target);
            }
        });
    }, { threshold: 0.5 });

    counterElements.forEach(el => observer.observe(el));
}

// === TESTIMONIAL CAROUSELS ===
function initCarousels() {
    document.querySelectorAll('.testimonial-carousel').forEach(carousel => {
        const track = carousel.querySelector('.testimonial-track');
        const slides = carousel.querySelectorAll('.testimonial-slide');
        const dotsContainer = carousel.querySelector('.testimonial-navigation');
        let currentIndex = 0;

        if (dotsContainer) {
            slides.forEach((_, index) => {
                const dot = document.createElement('div');
                dot.classList.add('testimonial-dot');
                if (index === 0) dot.classList.add('active');
                dot.addEventListener('click', () => goToSlide(index));
                dotsContainer.appendChild(dot);
            });
        }

        const nextBtn = carousel.querySelector('.testimonial-next');
        const prevBtn = carousel.querySelector('.testimonial-prev');

        if (nextBtn) nextBtn.addEventListener('click', nextSlide);
        if (prevBtn) prevBtn.addEventListener('click', prevSlide);

        function nextSlide() {
            goToSlide((currentIndex + 1) % slides.length);
        }

        function prevSlide() {
            goToSlide((currentIndex - 1 + slides.length) % slides.length);
        }

        function goToSlide(index) {
            currentIndex = index;
            track.style.transform = `translateX(-${index * 100}%)`;

            carousel.querySelectorAll('.testimonial-dot').forEach((dot, i) => {
                dot.classList.toggle('active', i === index);
            });
        }

        if (carousel.hasAttribute('data-auto-slide')) {
            const interval = parseInt(carousel.getAttribute('data-auto-slide'), 10) || 5000;
            setInterval(nextSlide, interval);
        }
    });
}

// === FLIP CARDS ===
function initFlipCards() {
    document.querySelectorAll('.flip-card').forEach(card => {
        if (card.classList.contains('click-to-flip')) {
            card.addEventListener('click', function () {
                this.classList.toggle('flipped');
            });
        }
    });
}

// === DARK MODE TOGGLE ===
function initDarkMode() {
    const darkModeToggle = document.getElementById('dark-mode-toggle');
    if (!darkModeToggle) return;

    const prefersDarkMode = localStorage.getItem('darkMode') === 'true';
    const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)').matches;

    if (prefersDarkMode || (prefersDarkScheme && localStorage.getItem('darkMode') === null)) {
        document.body.classList.add('dark-mode');
        darkModeToggle.checked = true;
    }

    darkModeToggle.addEventListener('change', function () {
        if (this.checked) {
            document.body.classList.add('dark-mode');
            localStorage.setItem('darkMode', 'true');
        } else {
            document.body.classList.remove('dark-mode');
            localStorage.setItem('darkMode', 'false');
        }
    });
}

// === FILTERING SYSTEM ===
function initFilterSystem() {
    document.querySelectorAll('.filter-container').forEach(container => {
        const filterControls = container.querySelectorAll('.filter-control');
        const filterItems = container.querySelectorAll('.filter-item');

        filterControls.forEach(control => {
            control.addEventListener('click', function () {
                filterControls.forEach(c => c.classList.remove('active'));
                this.classList.add('active');
                const filterValue = this.getAttribute('data-filter');

                filterItems.forEach(item => {
                    if (filterValue === 'all' || item.classList.contains(filterValue)) {
                        item.style.display = '';
                    } else {
                        item.style.display = 'none';
                    }
                });
            });
        });
    });
}

// === STAGGERED ELEMENTS + PROGRESS BARS ===
function initAnimations() {
    document.querySelectorAll('.stagger-fade-in').forEach(container => {
        const children = container.children;
        Array.from(children).forEach((child, index) => {
            child.style.opacity = 0;
            child.style.animation = `fadeIn 0.5s ease-out ${index * 0.1}s forwards`;
        });
    });

    document.querySelectorAll('.progress-bar').forEach(progressBar => {
        const fill = progressBar.querySelector('.progress-bar-fill');
        const targetWidth = fill.getAttribute('data-width') || '0';

        const observer = new IntersectionObserver((entries) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    fill.style.width = targetWidth;
                    observer.unobserve(entry.target);
                }
            });
        }, { threshold: 0.5 });

        observer.observe(progressBar);
    });
}

// === COLLAPSIBLE SECTIONS ===
function setupCollapsible(container) {
    const header = container.querySelector('.collapsible-header');
    const content = container.querySelector('.collapsible-body');

    header.addEventListener('click', function () {
        container.classList.toggle('active');
        content.style.maxHeight = container.classList.contains('active')
            ? content.scrollHeight + 'px'
            : 0;
    });

    content.style.maxHeight = 0;
}

// === TABS ===
function setupTabs(container) {
    const tabButtons = container.querySelectorAll('.tab-button');
    const tabContents = container.querySelectorAll('.tab-content');

    tabButtons.forEach((button, index) => {
        button.addEventListener('click', function () {
            tabButtons.forEach(btn => btn.classList.remove('active'));
            tabContents.forEach(content => content.classList.remove('active'));
            button.classList.add('active');
            tabContents[index].classList.add('active');
        });
    });

    if (tabButtons.length > 0) {
        tabButtons[0].click();
    }
}

// === SCROLL TO TOP BUTTON ===
function initScrollToTop() {
    const scrollTopBtn = document.getElementById('scroll-top-btn');
    if (!scrollTopBtn) return;

    window.addEventListener('scroll', function () {
        if (window.pageYOffset > 300) {
            scrollTopBtn.classList.add('show');
        } else {
            scrollTopBtn.classList.remove('show');
        }
    });

    scrollTopBtn.addEventListener('click', function () {
        window.scrollTo({ top: 0, behavior: 'smooth' });
    });
}