import {
  displayName,
  escapeSearchHtml,
  formatSearchPrice,
  loadSearchCatalog,
  searchCatalogProducts,
} from "/js/search-catalog.js?v=persianCopyRtl2";

const PREVIEW_COUNT = 4;
const MIN_CHARS = 2;
const DEBOUNCE_MS = 180;

function debounce(fn, ms) {
  let t = 0;
  return (...args) => {
    window.clearTimeout(t);
    t = window.setTimeout(() => fn(...args), ms);
  };
}

function suggestItemHtml(p) {
  const title = displayName(p);
  const href = `/products/${escapeSearchHtml(p.slug)}/`;
  const img = p.heroImage
    ? `<img src="${escapeSearchHtml(p.heroImage)}" alt="" width="40" height="50" loading="lazy" />`
    : `<span class="search-suggest-ph" aria-hidden="true"></span>`;
  return `<a class="search-suggest-item" role="option" href="${href}">
    ${img}
    <span class="search-suggest-meta">
      <span class="search-suggest-name">${escapeSearchHtml(title)}</span>
      <span class="search-suggest-price">${formatSearchPrice(p.price)}</span>
    </span>
  </a>`;
}

function bindSearchInput(input, panel) {
  if (!input || !panel) return;

  let products = null;
  let active = -1;

  loadSearchCatalog()
    .then((list) => {
      products = list;
    })
    .catch(() => {
      products = [];
    });

  function close() {
    panel.hidden = true;
    panel.innerHTML = "";
    active = -1;
    input.setAttribute("aria-expanded", "false");
  }

  function open() {
    panel.hidden = false;
    input.setAttribute("aria-expanded", "true");
  }

  function render(q) {
    if (!products) return;
    const hits = searchCatalogProducts(products, q, PREVIEW_COUNT);
    if (!hits.length) {
      close();
      return;
    }
    const allHref = `/search/?q=${encodeURIComponent(q.trim())}`;
    panel.innerHTML =
      hits.map(suggestItemHtml).join("") +
      `<a class="search-suggest-all" href="${allHref}">مشاهده همه نتایج</a>`;
    open();
    active = -1;
  }

  const onInput = debounce(() => {
    const q = input.value.trim();
    if (q.length < MIN_CHARS) {
      close();
      return;
    }
    render(q);
  }, DEBOUNCE_MS);

  input.addEventListener("input", onInput);
  input.addEventListener("focus", () => {
    const q = input.value.trim();
    if (q.length >= MIN_CHARS) render(q);
  });

  input.addEventListener("keydown", (e) => {
    const items = [...panel.querySelectorAll(".search-suggest-item, .search-suggest-all")];
    if (!items.length || panel.hidden) return;

    if (e.key === "ArrowDown") {
      e.preventDefault();
      active = Math.min(active + 1, items.length - 1);
      items.forEach((el, i) => el.classList.toggle("is-active", i === active));
      items[active]?.scrollIntoView({ block: "nearest" });
    } else if (e.key === "ArrowUp") {
      e.preventDefault();
      active = Math.max(active - 1, 0);
      items.forEach((el, i) => el.classList.toggle("is-active", i === active));
      items[active]?.scrollIntoView({ block: "nearest" });
    } else if (e.key === "Enter" && active >= 0) {
      e.preventDefault();
      items[active].click();
    } else if (e.key === "Escape") {
      close();
      input.blur();
    }
  });

  document.addEventListener("click", (e) => {
    if (!(e.target instanceof Element)) return;
    if (input.contains(e.target) || panel.contains(e.target)) return;
    close();
  });
}

export function initSearchSuggest() {
  document.querySelectorAll(".search-shell").forEach((shell) => {
    const input = shell.querySelector('input[type="search"]');
    const panel = shell.querySelector("[data-search-suggest]");
    bindSearchInput(input, panel);
  });

  document.querySelectorAll(".mobile-search").forEach((form) => {
    const input = form.querySelector('input[type="search"]');
    let panel = form.querySelector("[data-search-suggest]");
    if (!panel) {
      panel = document.createElement("div");
      panel.className = "search-suggest search-suggest--mobile";
      panel.setAttribute("data-search-suggest", "");
      panel.hidden = true;
      form.appendChild(panel);
    }
    bindSearchInput(input, panel);
  });

  const params = new URLSearchParams(location.search);
  const q = params.get("q");
  if (q && location.pathname.replace(/\/+$/, "").endsWith("/search")) {
    document.querySelectorAll('.search-form input[name="q"], .mobile-search input[name="q"]').forEach((input) => {
      input.value = q;
    });
  }
}