// عناصر الواجهة
const searchBox = document.getElementById("searchBox");
const clearSearch = document.getElementById("clearSearch");
const pageSizeEl = document.getElementById("pageSize");
const themeBtn = document.getElementById("themeToggle");
const tableBody = document.getElementById("tableBody");
const pagination = document.getElementById("pagination");
const counter = document.getElementById("counter");
const loading = document.getElementById("loading");

let data = [];
let filtered = [];
let currentPage = 1;

const DEFAULT_PAGE_SIZE = 10;
let rowsPerPage = DEFAULT_PAGE_SIZE;

// ضبط قيمة عدد الصفوف الافتراضي إن وُجد العنصر
if (pageSizeEl) {
  pageSizeEl.value = String(DEFAULT_PAGE_SIZE);
}

/* ========================
   دوال مساعدة للبحث بالعربية
   ======================== */

// توحيد الحروف العربية لتسهيل البحث
function normalizeArabic(str = "") {
  return str
    .replace(/[\u064B-\u0652]/g, "") // إزالة التشكيل
    .replace(/[أإآا]/g, "ا")
    .replace(/ى/g, "ي")
    .replace(/ؤ/g, "و")
    .replace(/ئ/g, "ي")
    .replace(/ة/g, "ه")
    .toLowerCase();
}

// التحقق إن كان النص يحتوي على عبارة البحث
function matches(text, query) {
  if (!query) return true;
  return normalizeArabic(String(text ?? "")).includes(
    normalizeArabic(query)
  );
}

// تمييز كلمة البحث داخل النص
function highlight(text, query) {
  if (!query) return String(text ?? "");
  const safe = query.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
  return String(text ?? "").replace(
    new RegExp(safe, "gi"),
    (m) => `<mark class="hl">${m}</mark>`
  );
}

/* ========================
   الترقيم (Pagination)
   ======================== */

function renderPagination() {
  pagination.innerHTML = "";

  const totalRows = filtered.length;
  const totalPages = Math.ceil(totalRows / rowsPerPage);

  if (totalPages <= 1) return;

  const makeBtn = (label, page, options = {}) => {
    const btn = document.createElement("button");
    btn.textContent = label;
    btn.className = "page-btn" + (options.ghost ? " ghost" : "");
    if (options.disabled) btn.disabled = true;
    btn.addEventListener("click", () => {
      currentPage = page;
      updateView();
      window.scrollTo({ top: 0, behavior: "smooth" });
    });
    return btn;
  };

  // السابق
  pagination.appendChild(
    makeBtn("‹", Math.max(1, currentPage - 1), {
      ghost: true,
      disabled: currentPage === 1,
    })
  );

  // منطق إظهار أرقام الصفحات
  const windowSize = 5;
  let start = Math.max(1, currentPage - Math.floor(windowSize / 2));
  let end = Math.min(totalPages, start + windowSize - 1);

  if (end - start + 1 < windowSize) {
    start = Math.max(1, end - windowSize + 1);
  }

  if (start > 1) {
    pagination.appendChild(
      makeBtn("1", 1, { ghost: currentPage !== 1 })
    );
  }

  if (start > 2) {
    const dots = document.createElement("span");
    dots.className = "dots";
    dots.textContent = "...";
    pagination.appendChild(dots);
  }

  for (let p = start; p <= end; p++) {
    const btn = makeBtn(String(p), p);
    if (p === currentPage) btn.classList.add("active");
    pagination.appendChild(btn);
  }

  if (end < totalPages - 1) {
    const dots = document.createElement("span");
    dots.className = "dots";
    dots.textContent = "...";
    pagination.appendChild(dots);
  }

  if (end < totalPages) {
    pagination.appendChild(
      makeBtn(String(totalPages), totalPages, {
        ghost: currentPage !== totalPages,
      })
    );
  }

  // التالي
  pagination.appendChild(
    makeBtn("›", Math.min(totalPages, currentPage + 1), {
      ghost: true,
      disabled: currentPage === totalPages,
    })
  );
}

/* ========================
   رسم الجدول (3 أعمدة)
   ======================== */

function renderTable() {
  const query = searchBox ? searchBox.value.trim() : "";
  tableBody.innerHTML = "";

  const startIndex = (currentPage - 1) * rowsPerPage;
  const pageItems = filtered.slice(startIndex, startIndex + rowsPerPage);

  if (pageItems.length === 0) {
    const tr = document.createElement("tr");
    const td = document.createElement("td");
    td.colSpan = 3;
    td.className = "no-results";
    td.textContent = "لا توجد نتائج مطابقة لبحثك.";
    tr.appendChild(td);
    tableBody.appendChild(tr);
    return;
  }

  pageItems.forEach((item) => {
    const tr = document.createElement("tr");

    const nameTd = document.createElement("td");
    nameTd.innerHTML = highlight(item.name, query);

    const qtyTd = document.createElement("td");
    qtyTd.innerHTML = highlight(item.quantity, query);

    const unitTd = document.createElement("td");
    unitTd.innerHTML = highlight(item.unit, query);

    tr.appendChild(nameTd);
    tr.appendChild(qtyTd);
    tr.appendChild(unitTd);

    tableBody.appendChild(tr);
  });
}

/* ========================
   تحديث العرض (فلترة + عداد)
   ======================== */

function updateView() {
  const query = searchBox ? searchBox.value.trim() : "";

  filtered = data.filter((item) => {
    return (
      matches(item.code, query) ||
      matches(item.name, query) ||
      matches(item.quantity, query) ||
      matches(item.unit, query)
    );
  });

  if (!counter) return;

  if (!query) {
    counter.textContent = `إجمالي البنود: ${data.length.toLocaleString()}`;
  } else if (filtered.length) {
    counter.textContent = `✅ عدد النتائج: ${filtered.length.toLocaleString()}`;
  } else {
    counter.textContent = "لا توجد نتائج مطابقة";
  }

  if (loading) {
    loading.style.display = "none";
  }

  renderTable();
  renderPagination();
}

/* ========================
   أدوات مساعدة
   ======================== */

function debounce(fn, delay = 220) {
  let timer;
  return (...args) => {
    clearTimeout(timer);
    timer = setTimeout(() => fn(...args), delay);
  };
}

/* ========================
   ربط الأحداث
   ======================== */

// البحث الفوري
if (searchBox) {
  searchBox.addEventListener(
    "input",
    debounce(() => {
      currentPage = 1;
      updateView();
    })
  );
}

// زر مسح البحث
if (clearSearch) {
  clearSearch.addEventListener("click", () => {
    searchBox.value = "";
    searchBox.focus();
    currentPage = 1;
    updateView();
  });
}

// تغيير عدد الصفوف
if (pageSizeEl) {
  pageSizeEl.addEventListener("change", () => {
    const val = parseInt(pageSizeEl.value, 10);
    rowsPerPage = !isNaN(val) && val > 0 ? val : DEFAULT_PAGE_SIZE;
    currentPage = 1;
    updateView();
  });
}

// اختصار / للتركيز على البحث
document.addEventListener("keydown", (e) => {
  if (e.key === "/") {
    if (document.activeElement === searchBox) return;
    e.preventDefault();
    if (searchBox) searchBox.focus();
  }
});

/* ========================
   الثيم (فاتح / ليلي)
   ======================== */

(function initTheme() {
  if (!themeBtn) return;

  const saved = localStorage.getItem("theme") || "light";
  const root = document.documentElement;

  if (saved === "dark") {
    root.classList.add("dark");
    themeBtn.textContent = "☀️ فاتح";
  } else {
    root.classList.remove("dark");
    themeBtn.textContent = "ليلي";
  }

  themeBtn.addEventListener("click", () => {
    const isDark = root.classList.toggle("dark");
    localStorage.setItem("theme", isDark ? "dark" : "light");
    themeBtn.textContent = isDark ? "☀️ فاتح" : "ليلي";
  });
})();

/* ========================
   تحميل data.json
   ======================== */

fetch("data.json", { cache: "no-cache" })
  .then((res) => res.json())
  .then((json) => {
    // توحيد الحقول + دعم أي تسميات قديمة
    data = (Array.isArray(json) ? json : []).map((row) => ({
      code:
        row.code ??
        row.Code ??
        row["رمز البند"] ??
        "",
      name:
        row.name ??
        row["اسم البند"] ??
        "",
      quantity:
        row.quantity ??
        row["الكمية المطلوبة"] ??
        "",
      unit:
        row.unit ??
        row["وحدة البند"] ??
        "",
    }));

    currentPage = 1;
    updateView();
  })
  .catch((err) => {
    console.error("تعذر تحميل data.json:", err);
    if (loading) {
      loading.textContent = "تعذر تحميل البيانات ❌";
    }
  });

/* ========================
   تأثير بسيط لحالة التمرير
   ======================== */

(function attachScrollHint() {
  const wrap = document.querySelector(".table-wrap");
  if (!wrap) return;

  let timer;
  wrap.addEventListener("scroll", () => {
    wrap.classList.add("scrolling");
    clearTimeout(timer);
    timer = setTimeout(() => {
      wrap.classList.remove("scrolling");
    }, 200);
  });
})();