/* ============================================================
   main.js — Scroll animations, counters, FAQ, BA slider
   ============================================================ */

(function () {
  'use strict';

  /* --- Scroll animation (IntersectionObserver) ------------ */
  function initScrollAnimations() {
    const els = document.querySelectorAll('[data-animate]');
    if (!els.length) return;

    const obs = new IntersectionObserver((entries) => {
      entries.forEach(entry => {
        if (entry.isIntersecting) {
          entry.target.classList.add('in-view');
          obs.unobserve(entry.target);
        }
      });
    }, { threshold: 0.12, rootMargin: '0px 0px -40px 0px' });

    els.forEach(el => obs.observe(el));
  }

  /* --- Animated counters ---------------------------------- */
  function animateCounter(el) {
    const target = parseFloat(el.dataset.count);
    const suffix = el.dataset.suffix || '';
    const prefix = el.dataset.prefix || '';
    const decimals = (target % 1 !== 0) ? 1 : 0;
    const duration = 1600;
    const start = performance.now();

    function tick(now) {
      const elapsed = now - start;
      const progress = Math.min(elapsed / duration, 1);
      const ease = 1 - Math.pow(1 - progress, 3);
      const value = target * ease;
      el.textContent = prefix + value.toFixed(decimals) + suffix;
      if (progress < 1) requestAnimationFrame(tick);
    }

    requestAnimationFrame(tick);
  }

  function initCounters() {
    const counters = document.querySelectorAll('[data-count]');
    if (!counters.length) return;

    const obs = new IntersectionObserver((entries) => {
      entries.forEach(entry => {
        if (entry.isIntersecting) {
          animateCounter(entry.target);
          obs.unobserve(entry.target);
        }
      });
    }, { threshold: 0.3 });

    counters.forEach(el => obs.observe(el));
  }

  /* --- FAQ accordion -------------------------------------- */
  function initFAQ() {
    document.querySelectorAll('.faq-item').forEach(item => {
      const q = item.querySelector('.faq-question');
      if (!q) return;

      q.addEventListener('click', () => {
        const isOpen = item.classList.contains('open');
        // close all
        document.querySelectorAll('.faq-item.open').forEach(i => {
          i.classList.remove('open');
        });
        if (!isOpen) item.classList.add('open');
      });
    });
  }

  /* --- Before / After slider ------------------------------ */
  function initBASlider(slider) {
    const handle     = slider.querySelector('.ba-handle');
    const beforeWrap = slider.querySelector('.ba-before-wrap');
    if (!handle || !beforeWrap) return;

    let dragging = false;

    function setPosition(clientX) {
      const rect   = slider.getBoundingClientRect();
      const rawPct = (clientX - rect.left) / rect.width;
      const pct    = Math.min(Math.max(rawPct, 0.02), 0.98);
      beforeWrap.style.width = (pct * 100) + '%';
      handle.style.left      = (pct * 100) + '%';
    }

    handle.addEventListener('mousedown',  () => { dragging = true; });
    handle.addEventListener('touchstart', () => { dragging = true; }, { passive: true });

    window.addEventListener('mousemove', e => { if (dragging) setPosition(e.clientX); });
    window.addEventListener('touchmove', e => { if (dragging) setPosition(e.touches[0].clientX); }, { passive: true });

    window.addEventListener('mouseup',  () => { dragging = false; });
    window.addEventListener('touchend', () => { dragging = false; });

    slider.addEventListener('click', e => setPosition(e.clientX));
  }

  function initBASliders() {
    document.querySelectorAll('.ba-slider').forEach(initBASlider);
  }

  /* --- Smooth scroll for anchor links --------------------- */
  function initSmoothScroll() {
    document.querySelectorAll('a[href^="#"]').forEach(a => {
      a.addEventListener('click', e => {
        const id = a.getAttribute('href').slice(1);
        const target = document.getElementById(id);
        if (!target) return;
        e.preventDefault();
        const headerH = parseInt(getComputedStyle(document.documentElement).getPropertyValue('--header-h')) || 72;
        const top = target.getBoundingClientRect().top + window.scrollY - headerH - 16;
        window.scrollTo({ top, behavior: 'smooth' });
      });
    });
  }

  /* --- Video hero fallback -------------------------------- */
  function initHeroVideo() {
    const video = document.querySelector('.hero-video-wrap video');
    if (!video) return;
    video.play().catch(() => {
      // autoplay blocked — poster image is visible; nothing to do
    });
  }

  /* --- Testimonial auto-scroll (on mobile) ---------------- */
  function initTestimonialScroll() {
    const track = document.querySelector('.testimonial-track');
    if (!track) return;

    let isPaused = false;
    track.addEventListener('mouseenter', () => { isPaused = true; });
    track.addEventListener('mouseleave', () => { isPaused = false; });

    // keyboard scroll within track
    track.setAttribute('tabindex', '0');
  }

  /* --- Boot ---------------------------------------------- */
  function boot() {
    initScrollAnimations();
    initCounters();
    initFAQ();
    initBASliders();
    initSmoothScroll();
    initHeroVideo();
    initTestimonialScroll();
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', boot);
  } else {
    boot();
  }
})();