/* =====================================================
GLOBAL STATE
===================================================== */

let index = 0;
let track;
let dots = [];


/* =====================================================
DOM CONTENT LOADED
===================================================== */

document.addEventListener("DOMContentLoaded", () => {
  initServices();
  initNavigation();
  initNewsSlider();
});


/* =====================================================
SERVICES EXPAND / COLLAPSE
===================================================== */

function initServices() {

  const boxes = document.querySelectorAll(".service-box");

  boxes.forEach(box => {

    const arrow = box.querySelector(".service-arrow");
    const text = box.querySelector(".service-text");

    let closeTimeout;

    arrow.addEventListener("click", () => {

      boxes.forEach(b => {
        if (b !== box) b.classList.remove("open");
        if (b.closeTimeout) clearTimeout(b.closeTimeout);
      });

      box.classList.toggle("open");
    });

    /* AUTO CLOSE */
    box.addEventListener("mouseleave", () => {
      if (box.classList.contains("open")) {
        box.classList.add("closing");

        closeTimeout = setTimeout(() => {
          box.classList.remove("open");
        }, 600);

        box.closeTimeout = closeTimeout;
      }
    });

    /* CANCEL CLOSE */
    box.addEventListener("mouseenter", () => {
      if (closeTimeout) clearTimeout(closeTimeout);
      box.classList.remove("closing");
    });

    /* CLEANUP CLASS */
    text.addEventListener("transitionend", e => {
      if (
        e.propertyName === "max-height" &&
        box.classList.contains("closing")
      ) {
        box.classList.remove("closing");
      }
    });
  });
}


/* =====================================================
SCROLL TO TOP
===================================================== */

function scrollToTop() {
  window.scrollTo({
    top: 0,
    behavior: "smooth"
  });
}


/* =====================================================
MOBILE BURGER MENU
===================================================== */

function toggleBurger() {
  document.querySelector(".nav").classList.toggle("open");
}


/* =====================================================
ACTIVE NAVIGATION SCROLL
===================================================== */

function initNavigation() {

  const sections = document.querySelectorAll("section");
  const navLinks = document.querySelectorAll(".nav-links a");

  window.addEventListener("scroll", () => {

    let current = "";

    sections.forEach(section => {
      const top = section.offsetTop - 120;

      if (window.scrollY >= top) {
        current = section.getAttribute("id");
      }
    });

    navLinks.forEach(link => {
      link.classList.remove("active");

      if (link.getAttribute("href") === "#" + current) {
        link.classList.add("active");
      }
    });
  });
}


/* =====================================================
NEWS SLIDER
===================================================== */

function initNewsSlider() {

  track = document.querySelector(".news-track");
  const slider = document.querySelector(".news-slider");
  const dotsContainer = document.querySelector(".news-dots");
  const slides = document.querySelectorAll(".news-slide");

  if (!track || !dotsContainer || slides.length === 0) return;

  let autoSlide;
  const INTERVAL = 8000; // 8 sec

  /* -------------------------
  CREATE DOTS
  ------------------------- */

  dotsContainer.innerHTML = "";
  dots = [];

  slides.forEach((slide, i) => {
    const dot = document.createElement("div");
    dot.classList.add("news-dot");
    if (i === 0) dot.classList.add("active");

    dot.addEventListener("click", () => {
      index = i;
      updateSlider();
      restartAutoSlide();
    });

    dotsContainer.appendChild(dot);
    dots.push(dot);
  });

  /* -------------------------
  UPDATE SLIDER
  ------------------------- */

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

    dots.forEach((dot, i) =>
      dot.classList.toggle("active", i === index)
    );
  }

  /* -------------------------
  AUTO LOOP
  ------------------------- */

  function startAutoSlide() {
    autoSlide = setInterval(() => {
      index++;

      if (index >= slides.length) {
        index = 0; // LOOP BACK
      }

      updateSlider();
    }, INTERVAL);
  }

  function stopAutoSlide() {
    clearInterval(autoSlide);
  }

  function restartAutoSlide() {
    stopAutoSlide();
    startAutoSlide();
  }

/* -------------------------
PAUSE ON HOVER
------------------------- */

const newsSection = document.querySelector("#news");

newsSection.addEventListener("mouseenter", () => {
  stopAutoSlide();
});

newsSection.addEventListener("mouseleave", () => {
  startAutoSlide();
});

  /* -------------------------
  TOUCH SUPPORT
  ------------------------- */

  let startX = 0;
  let isDragging = false;

  track.addEventListener("touchstart", e => {
    startX = e.touches[0].clientX;
    isDragging = true;
    stopAutoSlide();
  });

  track.addEventListener("touchmove", e => {
    if (!isDragging) return;

    const delta = e.touches[0].clientX - startX;

    track.style.transition = "none";
    track.style.transform =
      `translateX(calc(-${index * 100}% + ${delta}px))`;
  });

  track.addEventListener("touchend", e => {

    isDragging = false;
    track.style.transition = "transform 0.6s ease";

    const delta = e.changedTouches[0].clientX - startX;

    if (delta > 50 && index > 0) index--;
    else if (delta < -50 && index < slides.length - 1) index++;

    updateSlider();
    restartAutoSlide();
  });

  /* -------------------------
  INIT
  ------------------------- */

  updateSlider();
  startAutoSlide();
}