"use strict";

const loginView = document.getElementById("loginView");
const dashboardView = document.getElementById("dashboardView");
const loginForm = document.getElementById("loginForm");
const passwordInput = document.getElementById("password");
const loginButton = document.getElementById("loginButton");
const loginError = document.getElementById("loginError");
const togglePassword = document.getElementById("togglePassword");
const logoutButton = document.getElementById("logoutButton");
const regionSelect = document.getElementById("regionSelect");
const regionButtons = document.getElementById("regionButtons");
const citySelect = document.getElementById("citySelect");
const searchInput = document.getElementById("searchInput");
const clearFiltersButton = document.getElementById("clearFiltersButton");
const emptyState = document.getElementById("emptyState");
const resultsSection = document.getElementById("resultsSection");
const resultsMeta = document.getElementById("resultsMeta");
const resultsTitle = document.getElementById("resultsTitle");
const samplesGrid = document.getElementById("samplesGrid");
const noResults = document.getElementById("noResults");
const loadMoreWrap = document.getElementById("loadMoreWrap");
const loadMoreButton = document.getElementById("loadMoreButton");
const loadMoreMeta = document.getElementById("loadMoreMeta");
const toast = document.getElementById("toast");

const PAGE_SIZE = 24;
const STATE_KEY = "icsInquiryFilters";
const CONTACT_MESSAGE = (row) =>
  [
    "السلام عليكم ورحمة الله وبركاته",
    "",
    "أستاذي الكريم،",
    "نأمل تزويدنا بموقع المنشأة التالية، وذلك لاستكمال بيانات الزيارة الميدانية:",
    "",
    `منشأة: ${row.establishmentName || "-"}`,
    `السجل التجاري: ${row.commercialRecord || "-"}`,
    `المدينة: ${row.city || "-"}`,
    "",
    "شاكرين لكم تعاونكم.",
  ].join("\n");

let rows = [];
let visibleRows = [];
let renderedCount = 0;
let toastTimer;
let isRestoringState = false;

function base64ToBytes(value) {
  const binary = atob(value);
  return Uint8Array.from(binary, (char) => char.charCodeAt(0));
}

async function deriveKey(password, salt) {
  const material = await crypto.subtle.importKey(
    "raw",
    new TextEncoder().encode(password),
    "PBKDF2",
    false,
    ["deriveKey"],
  );
  return crypto.subtle.deriveKey(
    { name: "PBKDF2", salt, iterations: ENCRYPTED_DATA.iterations, hash: "SHA-256" },
    material,
    { name: "AES-GCM", length: 256 },
    false,
    ["decrypt"],
  );
}

async function decryptData(password) {
  const salt = base64ToBytes(ENCRYPTED_DATA.salt);
  const iv = base64ToBytes(ENCRYPTED_DATA.iv);
  const cipherText = base64ToBytes(ENCRYPTED_DATA.payload);
  const key = await deriveKey(password, salt);
  const plainBuffer = await crypto.subtle.decrypt({ name: "AES-GCM", iv }, key, cipherText);
  return JSON.parse(new TextDecoder().decode(plainBuffer));
}

function normalize(value) {
  return String(value ?? "")
    .normalize("NFKD")
    .replace(/[\u064B-\u065F\u0670]/g, "")
    .replace(/[أإآ]/g, "ا")
    .replace(/ى/g, "ي")
    .replace(/ة/g, "ه")
    .replace(/\s+/g, " ")
    .trim()
    .toLowerCase();
}

function uniqueSorted(values) {
  return [...new Set(values.filter(Boolean))].sort((a, b) =>
    String(a).localeCompare(String(b), "ar", { sensitivity: "base" }),
  );
}

function setOptions(select, values, placeholder) {
  select.replaceChildren(new Option(placeholder, ""));
  values.forEach((value) => select.add(new Option(value, value)));
}

function saveFilterState() {
  if (isRestoringState) return;
  localStorage.setItem(
    STATE_KEY,
    JSON.stringify({
      region: regionSelect.value,
      city: citySelect.value,
      search: searchInput.value,
    }),
  );
}

function getSavedFilterState() {
  try {
    return JSON.parse(localStorage.getItem(STATE_KEY) || "{}");
  } catch {
    return {};
  }
}

function updateRegionButtonState() {
  regionButtons.querySelectorAll(".region-choice").forEach((button) => {
    const isActive = button.dataset.region === regionSelect.value;
    button.classList.toggle("active", isActive);
    button.setAttribute("aria-checked", String(isActive));
  });
}

function setRegion(region, scrollToControls = false) {
  regionSelect.value = region;
  updateRegionButtonState();
  const cities = uniqueSorted(rows.filter((row) => row.region === region).map((row) => row.city));
  setOptions(citySelect, cities, "اختر المدينة الصناعية");
  citySelect.disabled = !region;
  citySelect.value = "";
  applyFilters();
  if (scrollToControls) {
    window.scrollTo({ top: document.querySelector(".controls-panel").offsetTop - 16, behavior: "smooth" });
  }
}

function showToast(message) {
  clearTimeout(toastTimer);
  toast.textContent = message;
  toast.classList.add("show");
  toastTimer = setTimeout(() => toast.classList.remove("show"), 2200);
}

async function copyText(text, successMessage) {
  try {
    await navigator.clipboard.writeText(text);
  } catch {
    const area = document.createElement("textarea");
    area.value = text;
    area.style.position = "fixed";
    area.style.opacity = "0";
    document.body.append(area);
    area.select();
    document.execCommand("copy");
    area.remove();
  }
  showToast(successMessage);
}

function phoneDigits(value) {
  const match = String(value ?? "").match(/(?:\+?966|0)?5\d{8}/);
  if (!match) return "";
  let digits = match[0].replace(/\D/g, "");
  if (digits.startsWith("966")) return digits;
  if (digits.startsWith("0")) return `966${digits.slice(1)}`;
  return `966${digits}`;
}

function localPhoneNumber(value) {
  const digits = phoneDigits(value);
  if (!digits) return "";
  return digits.startsWith("966") ? `0${digits.slice(3)}` : digits;
}

function isCoordinate(value) {
  return /^[-+]?\d{1,2}(?:\.\d+)?\s*,\s*[-+]?\d{1,3}(?:\.\d+)?$/.test(String(value ?? "").trim());
}

function hasLocationInfo(row) {
  return Boolean(String(row.coordinates ?? "").trim());
}

function sortRowsByLocationInfo(items) {
  return [...items].sort((a, b) => Number(hasLocationInfo(b)) - Number(hasLocationInfo(a)));
}

function createSvgIcon(path) {
  const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
  svg.setAttribute("viewBox", "0 0 24 24");
  svg.setAttribute("aria-hidden", "true");
  const p = document.createElementNS("http://www.w3.org/2000/svg", "path");
  p.setAttribute("d", path);
  svg.append(p);
  return svg;
}

function createActionLink(label, href, iconPath) {
  const link = document.createElement("a");
  link.className = "action-link";
  link.href = href;
  link.target = "_blank";
  link.rel = "noopener";
  link.append(createSvgIcon(iconPath), document.createTextNode(label));
  return link;
}

function createDetail(label, value, extraClass = "") {
  const item = document.createElement("div");
  item.className = `detail-item ${extraClass}`.trim();
  const title = document.createElement("span");
  title.className = "detail-label";
  title.textContent = label;
  const text = document.createElement("span");
  text.className = "detail-value";
  text.textContent = String(value);
  item.append(title, text);
  return item;
}

function createCoordinatesBlock(row) {
  const value = String(row.coordinates ?? "").trim();
  if (!value) return null;

  const item = document.createElement("div");
  const hasCoordinates = isCoordinate(value);
  item.className = `detail-item coordinates-detail ${hasCoordinates ? "map-detail" : "statement-detail"}`;
  const label = document.createElement("span");
  label.className = "detail-label";
  label.textContent = hasCoordinates ? "الإحداثيات" : "إفادة مدن";
  item.append(label);

  if (hasCoordinates) {
    item.append(
      createActionLink(
        "اضغط هنا للذهاب بخرائط Google",
        `https://www.google.com/maps?q=${encodeURIComponent(value)}`,
        "M12 21s7-4.6 7-11a7 7 0 1 0-14 0c0 6.4 7 11 7 11Z M12 12.5a2.5 2.5 0 1 0 0-5 2.5 2.5 0 0 0 0 5Z",
      ),
    );
    return item;
  }

  const phone = phoneDigits(value);
  const note = document.createElement("p");
  note.className = "contact-note";
  note.textContent = value;
  item.append(note);

  if (phone) {
    const message = CONTACT_MESSAGE(row);
    const actions = document.createElement("div");
    actions.className = "contact-actions";
    const copyPhoneButton = document.createElement("button");
    copyPhoneButton.type = "button";
    copyPhoneButton.className = "action-link";
    copyPhoneButton.append(
      createSvgIcon("M8 8h11v11H8z M5 16H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"),
      document.createTextNode("نسخ الرقم"),
    );
    copyPhoneButton.addEventListener("click", () =>
      copyText(localPhoneNumber(value), "تم نسخ الرقم"),
    );
    actions.append(
      copyPhoneButton,
      createActionLink("واتساب", `https://wa.me/${phone}?text=${encodeURIComponent(message)}`, "M20.5 11.5a8.5 8.5 0 0 1-12.6 7.4L3 20l1.2-4.7A8.5 8.5 0 1 1 20.5 11.5Z M8.6 8.7c.2 3.3 2.7 5.8 6 6.2"),
    );
    const copyButton = document.createElement("button");
    copyButton.type = "button";
    copyButton.className = "action-link";
    copyButton.append(createSvgIcon("M8 8h11v11H8z M5 16H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"), document.createTextNode("نسخ رسالة مقترحة"));
    copyButton.addEventListener("click", () => copyText(message, "تم نسخ الرسالة المقترحة"));
    actions.append(copyButton);
    item.append(actions);
  }

  return item;
}

function createCard(row, index) {
  const card = document.createElement("article");
  card.className = "sample-card";

  const header = document.createElement("div");
  header.className = "sample-card-header";
  const heading = document.createElement("div");
  const indexEl = document.createElement("span");
  indexEl.className = "sample-index";
  indexEl.textContent = `منشأة ${index + 1}`;
  const title = document.createElement("h3");
  title.textContent = row.establishmentName || "منشأة دون اسم";
  heading.append(indexEl, title);
  const badge = document.createElement("span");
  badge.className = "status-badge";
  badge.textContent = row.complianceStatus || "غير محدد";
  header.append(heading, badge);

  const details = document.createElement("div");
  details.className = "sample-details";
  [
    ["السجل التجاري", row.commercialRecord, "ltr-value wide-detail"],
    ["توضيح المدينة", row.cityClarification, "wide-detail"],
  ].forEach(([label, value, className]) => {
    if (String(value ?? "").trim()) details.append(createDetail(label, value, className));
  });
  const coordinatesBlock = createCoordinatesBlock(row);
  if (coordinatesBlock) details.append(coordinatesBlock);

  card.append(header, details);
  return card;
}

function renderVisibleRows(reset = false) {
  if (reset) {
    renderedCount = 0;
    samplesGrid.replaceChildren();
  }
  const fragment = document.createDocumentFragment();
  visibleRows.slice(renderedCount, renderedCount + PAGE_SIZE).forEach((row, offset) => {
    fragment.append(createCard(row, renderedCount + offset));
  });
  samplesGrid.append(fragment);
  renderedCount += Math.min(PAGE_SIZE, visibleRows.length - renderedCount);
  const remaining = visibleRows.length - renderedCount;
  loadMoreWrap.hidden = remaining <= 0;
  loadMoreButton.textContent = `عرض المزيد (${Math.min(PAGE_SIZE, remaining)})`;
  loadMoreMeta.textContent = `تم عرض ${renderedCount} من أصل ${visibleRows.length} منشأة`;
}

function applyFilters() {
  const region = regionSelect.value;
  const city = citySelect.value;
  const query = normalize(searchInput.value);

  const scopedRows = rows.filter((row) => {
    const matchesRegion = !region || row.region === region;
    const matchesCity = !city || row.city === city;
    return matchesRegion && matchesCity;
  });

  visibleRows = sortRowsByLocationInfo(scopedRows.filter((row) => {
    if (!query) return Boolean(city || region);
    return (
      normalize(row.establishmentName).includes(query) ||
      normalize(row.commercialRecord).includes(query) ||
      normalize(row.cityClarification).includes(query)
    );
  }));

  const shouldShow = visibleRows.length > 0 || city || region || query;
  emptyState.hidden = shouldShow;
  resultsSection.hidden = !shouldShow;
  noResults.hidden = visibleRows.length !== 0;
  resultsTitle.textContent = city || region || "نتائج البحث";
  resultsMeta.textContent = `${visibleRows.length} من أصل ${scopedRows.length} منشأة`;
  renderVisibleRows(true);
  saveFilterState();
}

function initializeDashboard(data) {
  rows = data.rows || [];
  const regions = data.regions || uniqueSorted(rows.map((row) => row.region));
  setOptions(regionSelect, regions, "اختر المنطقة");
  const regionCounts = new Map();
  rows.forEach((row) => regionCounts.set(row.region, (regionCounts.get(row.region) || 0) + 1));
  regionButtons.replaceChildren(
    ...regions.map((region) => {
      const button = document.createElement("button");
      button.type = "button";
      button.className = "region-choice";
      button.dataset.region = region;
      button.setAttribute("role", "radio");
      button.setAttribute("aria-checked", "false");
      const name = document.createElement("span");
      name.textContent = region;
      const count = document.createElement("strong");
      count.textContent = regionCounts.get(region) || 0;
      button.append(name, count);
      button.addEventListener("click", () => setRegion(region));
      return button;
    }),
  );
  setOptions(citySelect, [], "اختر المدينة الصناعية");
  citySelect.disabled = true;
  restoreFilterState();
}

function restoreFilterState() {
  const saved = getSavedFilterState();
  isRestoringState = true;
  searchInput.value = saved.search || "";
  if (saved.region && [...regionSelect.options].some((option) => option.value === saved.region)) {
    setRegion(saved.region);
    if (saved.city && [...citySelect.options].some((option) => option.value === saved.city)) {
      citySelect.value = saved.city;
    }
  } else {
    setRegion("");
  }
  isRestoringState = false;
  applyFilters();
}

function performLogout() {
  rows = [];
  visibleRows = [];
  searchInput.value = "";
  setRegion("");
  citySelect.value = "";
  dashboardView.hidden = true;
  loginView.hidden = false;
  passwordInput.focus();
}

loginForm.addEventListener("submit", async (event) => {
  event.preventDefault();
  const password = passwordInput.value.trim();
  if (!password) return;
  loginButton.disabled = true;
  loginButton.querySelector("span").textContent = "جاري التحقق...";
  loginError.textContent = "";

  try {
    const data = await decryptData(password);
    initializeDashboard(data);
    passwordInput.value = "";
    loginView.hidden = true;
    dashboardView.hidden = false;
  } catch {
    loginError.textContent = "رمز الدخول غير صحيح.";
    passwordInput.select();
  } finally {
    loginButton.disabled = false;
    loginButton.querySelector("span").textContent = "دخول";
  }
});

togglePassword.addEventListener("click", () => {
  const showing = passwordInput.type === "text";
  passwordInput.type = showing ? "password" : "text";
  togglePassword.setAttribute("aria-label", showing ? "إظهار رمز الدخول" : "إخفاء رمز الدخول");
});

logoutButton.addEventListener("click", performLogout);

regionSelect.addEventListener("change", () => setRegion(regionSelect.value));

citySelect.addEventListener("change", applyFilters);
searchInput.addEventListener("input", applyFilters);
loadMoreButton.addEventListener("click", () => renderVisibleRows());
clearFiltersButton.addEventListener("click", () => {
  searchInput.value = "";
  localStorage.removeItem(STATE_KEY);
  setRegion("");
  showToast("تم مسح الاختيارات");
});

if (!window.crypto?.subtle || typeof ENCRYPTED_DATA === "undefined") {
  loginButton.disabled = true;
  loginError.textContent = "تعذر تشغيل التشفير في هذا المتصفح. استخدم متصفحًا حديثًا.";
}