"use strict";

const FIELD_LABELS = [
  "اسم المشرف",
  "اسم الباحث",
  "رقم السجل(العينة)",
  "اسم العينة",
  "حالة الاكتمال",
  "حالة الاقرار",
  "حالة الاستيفاء",
  "نوع الاستيفاء",
  "حالة الاعتماد",
  "النشاط",
  "الايميل",
  "الموقع",
  "رقم التواصل",
];

const FIELD_KEYS = [
  "supervisor",
  "researcher",
  "recordNumber",
  "sampleName",
  "completionStatus",
  "declarationStatus",
  "fulfillmentStatus",
  "fulfillmentType",
  "approvalStatus",
  "activity",
  "email",
  "location",
  "phone",
];

const DISPLAY_FIELDS = [
  ["recordNumber", "رقم السجل", false],
  ["completionStatus", "حالة الاكتمال", false],
  ["declarationStatus", "حالة الإقرار", false],
  ["fulfillmentType", "نوع الاستيفاء", false],
  ["approvalStatus", "حالة الاعتماد", false],
  ["activity", "النشاط", true],
  ["email", "البريد الإلكتروني", true],
  ["location", "الموقع", true],
  ["phone", "رقم التواصل", true],
];

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 supervisorSelect = document.getElementById("supervisorSelect");
const researcherSelect = document.getElementById("researcherSelect");
const statusSelect = document.getElementById("statusSelect");
const searchInput = document.getElementById("searchInput");
const emptyState = document.getElementById("emptyState");
const resultsSection = document.getElementById("resultsSection");
const resultsMeta = document.getElementById("resultsMeta");
const resultsTitle = document.getElementById("resultsTitle");
const statusChips = document.getElementById("statusChips");
const samplesGrid = document.getElementById("samplesGrid");
const noResults = document.getElementById("noResults");
const copyAllButton = document.getElementById("copyAllButton");
const loadMoreWrap = document.getElementById("loadMoreWrap");
const loadMoreButton = document.getElementById("loadMoreButton");
const loadMoreMeta = document.getElementById("loadMoreMeta");
const clearFiltersButton = document.getElementById("clearFiltersButton");
const toast = document.getElementById("toast");

let allRows = [];
let visibleRows = [];
let failedAttempts = 0;
let toastTimer;
let inactivityTimer;
let inactivityWarningTimer;
let renderedCount = 0;
const ALL_SUPERVISORS_VALUE = "__all_supervisors__";
const PAGE_SIZE = 24;
const INACTIVITY_TIMEOUT_MS = 30 * 60 * 1000;
const INACTIVITY_WARNING_MS = 29 * 60 * 1000;
const ACTIVITY_EVENTS = ["click", "keydown", "pointerdown", "touchstart", "scroll"];

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 formatPhone(value) {
  const raw = String(value ?? "").trim();
  if (!raw) return "";
  const digits = raw.replace(/\D/g, "");
  if (!digits) return raw;
  if (digits.startsWith("0")) return digits;
  if (digits.startsWith("966")) return `0${digits.slice(3)}`;
  return `0${digits}`;
}

function rowToObject(row) {
  const item = Object.fromEntries(FIELD_KEYS.map((key, index) => [key, row[index] ?? ""]));
  item.phone = formatPhone(item.phone);
  return item;
}

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, counts = null) {
  select.replaceChildren(new Option(placeholder, ""));
  values.forEach((value) => {
    const label = counts ? `${value} (${counts.get(value) || 0})` : value;
    select.add(new Option(label, value));
  });
}

function showToast(message) {
  clearTimeout(toastTimer);
  toast.textContent = message;
  toast.classList.add("show");
  toastTimer = setTimeout(() => toast.classList.remove("show"), 2300);
}

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 buildMessage(row, index = null) {
  const title = index === null ? "بيانات العينة للتواصل" : `العينة رقم (${index})`;
  const sampleLines = [
    title,
    "────────────────────",
    row.sampleName && `اسم العينة: ${row.sampleName}`,
    row.recordNumber && `رقم السجل: ${row.recordNumber}`,
    row.fulfillmentStatus && `حالة الاستيفاء: ${row.fulfillmentStatus}`,
    row.activity && `النشاط: ${row.activity}`,
  ].filter(Boolean);
  const contactLines = [
    "بيانات التواصل",
    "────────────────────",
    row.phone && `رقم التواصل: ${formatPhone(row.phone)}`,
    row.email && `البريد الإلكتروني: ${row.email}`,
    row.location && `الموقع: ${row.location}`,
  ].filter(Boolean);
  const sections = [];

  if (index === null) {
    sections.push(
      "السلام عليكم ورحمة الله وبركاته،",
      "نأمل التكرم بالتواصل مع العينة التالية واستكمال الإجراء اللازم:",
    );
  }

  sections.push(sampleLines.join("\n"));
  if (contactLines.length > 2) sections.push(contactLines.join("\n"));
  if (index === null) sections.push("شاكرين لكم تعاونكم.");
  return sections.join("\n\n");
}

function createDetail(key, label, isContact, value) {
  const wrapper = document.createElement("div");
  wrapper.className = `detail-item${isContact ? " contact-detail" : ""}`;

  const labelElement = document.createElement("span");
  labelElement.className = "detail-label";
  labelElement.textContent = label;

  const valueRow = document.createElement("div");
  valueRow.className = "detail-value-row";
  const valueElement = document.createElement("span");
  valueElement.className = "detail-value";
  valueElement.textContent = String(value);
  if (key === "phone" || key === "recordNumber") {
    valueElement.dir = "ltr";
    valueElement.style.textAlign = "right";
  }

  valueRow.append(valueElement);
  if (key === "phone" || key === "email") {
    const copyFieldButton = document.createElement("button");
    copyFieldButton.type = "button";
    copyFieldButton.className = "copy-field-button";
    copyFieldButton.setAttribute("aria-label", key === "phone" ? "نسخ رقم التواصل" : "نسخ البريد الإلكتروني");
    copyFieldButton.title = key === "phone" ? "نسخ رقم التواصل" : "نسخ البريد الإلكتروني";
    copyFieldButton.innerHTML = `
      <svg viewBox="0 0 24 24" aria-hidden="true">
        <rect x="8" y="8" width="11" height="11" rx="2"></rect>
        <path d="M16 8V6a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v8a2 2 0 0 0 2 2h2"></path>
      </svg>
    `;
    copyFieldButton.addEventListener("click", () =>
      copyText(String(value), key === "phone" ? "تم نسخ رقم التواصل" : "تم نسخ البريد الإلكتروني"),
    );
    valueRow.append(copyFieldButton);
  }

  wrapper.append(labelElement, valueRow);
  return wrapper;
}

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

  const header = document.createElement("div");
  header.className = "sample-card-header";

  const headingWrap = document.createElement("div");
  const number = document.createElement("span");
  number.className = "sample-index";
  number.textContent = `العينة ${index + 1}`;
  const title = document.createElement("h3");
  title.textContent = row.sampleName || "عينة دون اسم";
  headingWrap.append(number, title);

  const badge = document.createElement("span");
  badge.className = "status-badge";
  badge.textContent = row.fulfillmentStatus || "غير محدد";
  header.append(headingWrap, badge);

  const details = document.createElement("div");
  details.className = "sample-details";
  DISPLAY_FIELDS.forEach(([key, label, isContact]) => {
    if (String(row[key] ?? "").trim()) {
      details.append(createDetail(key, label, isContact, row[key]));
    }
  });

  const footer = document.createElement("div");
  footer.className = "sample-card-footer";
  const copyButton = document.createElement("button");
  copyButton.className = "copy-sample";
  copyButton.type = "button";
  copyButton.textContent = "نسخ رسالة هذه العينة";
  copyButton.addEventListener("click", () =>
    copyText(buildMessage(row), "تم نسخ رسالة العينة"),
  );
  footer.append(copyButton);

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

function renderVisibleRows(reset = false) {
  if (reset) {
    renderedCount = 0;
    samplesGrid.replaceChildren();
  }

  const nextRows = visibleRows.slice(renderedCount, renderedCount + PAGE_SIZE);
  const fragment = document.createDocumentFragment();
  nextRows.forEach((row, offset) => {
    fragment.append(createSampleCard(row, renderedCount + offset));
  });
  samplesGrid.append(fragment);
  renderedCount += nextRows.length;

  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} عينة`;
}

function renderStatusChips(rows) {
  const counts = new Map();
  rows.forEach((row) => {
    const status = row.fulfillmentStatus || "غير محدد";
    counts.set(status, (counts.get(status) || 0) + 1);
  });

  const createChip = (label, value, count) => {
    const chip = document.createElement("button");
    chip.type = "button";
    chip.className = `status-chip${statusSelect.value === value ? " active" : ""}`;
    chip.setAttribute("aria-pressed", String(statusSelect.value === value));
    chip.append(document.createTextNode(label));

    const strong = document.createElement("strong");
    strong.textContent = count;
    chip.append(strong);
    chip.addEventListener("click", () => {
      statusSelect.value = value;
      applyFilters();
    });
    return chip;
  };

  const chips = [createChip("الكل", "", rows.length)];
  [...counts.entries()].forEach(([status, count]) => {
    chips.push(createChip(status, status, count));
  });
  statusChips.replaceChildren(...chips);
}

function applyFilters() {
  const supervisor = supervisorSelect.value;
  const researcher = researcherSelect.value;
  const query = normalize(searchInput.value);

  if (!supervisor && !query) {
    resultsSection.hidden = true;
    emptyState.hidden = false;
    return;
  }

  const status = statusSelect.value;
  const supervisorRows =
    !supervisor || supervisor === ALL_SUPERVISORS_VALUE
      ? allRows
      : allRows.filter((row) => row.supervisor === supervisor);
  const scopedRows = researcher
    ? supervisorRows.filter((row) => row.researcher === researcher)
    : supervisorRows;

  visibleRows = scopedRows.filter((row) => {
    const matchesStatus = !status || row.fulfillmentStatus === status;
    const matchesSearch =
      !query ||
      normalize(row.sampleName).includes(query) ||
      normalize(row.recordNumber).includes(query);
    return matchesStatus && matchesSearch;
  });

  emptyState.hidden = true;
  resultsSection.hidden = false;
  resultsTitle.textContent =
    researcher ||
    (supervisor === ALL_SUPERVISORS_VALUE
      ? "جميع العينات"
      : supervisor
        ? `عينات المشرف: ${supervisor}`
        : "نتائج البحث");
  resultsMeta.textContent = `${visibleRows.length} من أصل ${scopedRows.length} عينة`;
  copyAllButton.disabled = visibleRows.length === 0;
  copyAllButton.textContent = researcher ? "نسخ جميع عينات الباحث" : "نسخ جميع النتائج المعروضة";
  renderStatusChips(scopedRows);

  renderVisibleRows(true);
  noResults.hidden = visibleRows.length !== 0;
}

function resetResearcherControls() {
  setOptions(researcherSelect, [], "جميع الباحثين");
  setOptions(statusSelect, [], "جميع الحالات");
  researcherSelect.disabled = true;
  statusSelect.disabled = true;
  resultsSection.hidden = true;
  emptyState.hidden = false;
  emptyState.querySelector("h3").textContent = "ابحث أو اختر المشرف";
  emptyState.querySelector("p").textContent =
    "يمكنك البحث مباشرة باسم العينة أو رقم السجل، أو اختيار المشرف لعرض كامل عيناته.";
}

function initializeDashboard(data) {
  allRows = data.rows.map(rowToObject);
  const supervisorCounts = new Map();
  allRows.forEach((row) =>
    supervisorCounts.set(row.supervisor, (supervisorCounts.get(row.supervisor) || 0) + 1),
  );
  setOptions(
    supervisorSelect,
    uniqueSorted(allRows.map((row) => row.supervisor)),
    "اختر المشرف",
    supervisorCounts,
  );
  supervisorSelect.add(
    new Option(`إبراهيم - جميع العينات (${allRows.length})`, ALL_SUPERVISORS_VALUE),
    1,
  );
  searchInput.value = "";
  searchInput.disabled = false;
  resetResearcherControls();
  startInactivityTimer();
}

function clearInactivityTimers() {
  clearTimeout(inactivityTimer);
  clearTimeout(inactivityWarningTimer);
}

function startInactivityTimer() {
  clearInactivityTimers();
  if (dashboardView.hidden) return;

  inactivityWarningTimer = setTimeout(() => {
    showToast("سيتم تسجيل الخروج تلقائيًا بعد دقيقة لعدم وجود نشاط");
  }, INACTIVITY_WARNING_MS);

  inactivityTimer = setTimeout(() => {
    performLogout("تم تسجيل الخروج تلقائيًا بعد 30 دقيقة من عدم النشاط");
  }, INACTIVITY_TIMEOUT_MS);
}

function performLogout(message = "") {
  clearInactivityTimers();
  allRows = [];
  visibleRows = [];
  renderedCount = 0;
  supervisorSelect.value = "";
  searchInput.value = "";
  resetResearcherControls();
  dashboardView.hidden = true;
  loginView.hidden = false;
  passwordInput.focus();
  if (message) showToast(message);
}

function clearFilters() {
  supervisorSelect.value = "";
  searchInput.value = "";
  resetResearcherControls();
  window.scrollTo({ top: 0, behavior: "smooth" });
  showToast("تم مسح جميع الفلاتر");
}

function handleActivity() {
  if (!dashboardView.hidden) startInactivityTimer();
}

loginForm.addEventListener("submit", async (event) => {
  event.preventDefault();
  const password = passwordInput.value.trim();
  if (!password) return;

  loginButton.disabled = true;
  loginButton.querySelector("span").textContent = "جارٍ التحقق...";
  loginError.textContent = "";

  if (failedAttempts >= 3) {
    await new Promise((resolve) => setTimeout(resolve, Math.min(failedAttempts * 800, 5000)));
  }

  try {
    const data = await decryptData(password);
    initializeDashboard(data);
    passwordInput.value = "";
    loginView.hidden = true;
    dashboardView.hidden = false;
    failedAttempts = 0;
  } catch {
    failedAttempts += 1;
    loginError.textContent = "رمز الدخول غير صحيح. تحقق منه وحاول مرة أخرى.";
    passwordInput.select();
  } finally {
    loginButton.disabled = false;
    loginButton.querySelector("span").textContent = "دخول آمن";
  }
});

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();
});

supervisorSelect.addEventListener("change", () => {
  resetResearcherControls();
  searchInput.value = "";
  if (!supervisorSelect.value) {
    applyFilters();
    return;
  }

  const researchers = uniqueSorted(
    allRows
      .filter(
        (row) =>
          supervisorSelect.value === ALL_SUPERVISORS_VALUE ||
          row.supervisor === supervisorSelect.value,
      )
      .map((row) => row.researcher),
  );
  const scopeRows =
    supervisorSelect.value === ALL_SUPERVISORS_VALUE
      ? allRows
      : allRows.filter((row) => row.supervisor === supervisorSelect.value);
  const researcherCounts = new Map();
  scopeRows.forEach((row) =>
    researcherCounts.set(row.researcher, (researcherCounts.get(row.researcher) || 0) + 1),
  );
  setOptions(researcherSelect, researchers, "جميع الباحثين", researcherCounts);
  setOptions(
    statusSelect,
    uniqueSorted(scopeRows.map((row) => row.fulfillmentStatus)),
    "جميع الحالات",
  );
  researcherSelect.disabled = false;
  statusSelect.disabled = false;
  applyFilters();
});

researcherSelect.addEventListener("change", () => {
  const rows = allRows.filter((row) => {
    const matchesSupervisor =
      supervisorSelect.value === ALL_SUPERVISORS_VALUE ||
      row.supervisor === supervisorSelect.value;
    const matchesResearcher =
      !researcherSelect.value || row.researcher === researcherSelect.value;
    return matchesSupervisor && matchesResearcher;
  });
  const statuses = uniqueSorted(rows.map((row) => row.fulfillmentStatus));
  setOptions(statusSelect, statuses, "جميع الحالات");
  statusSelect.disabled = false;
  applyFilters();
});

statusSelect.addEventListener("change", applyFilters);
searchInput.addEventListener("input", applyFilters);
loadMoreButton.addEventListener("click", () => renderVisibleRows());
clearFiltersButton.addEventListener("click", clearFilters);
ACTIVITY_EVENTS.forEach((eventName) =>
  document.addEventListener(eventName, handleActivity, { passive: true }),
);

copyAllButton.addEventListener("click", () => {
  if (!visibleRows.length) return;
  const heading = researcherSelect.value
    ? `بيانات العينات الخاصة بالباحث: ${researcherSelect.value}`
    : `بيانات العينات المعروضة (${visibleRows.length} عينة)`;
  const messages = visibleRows.map((row, index) => buildMessage(row, index + 1));
  copyText(
    [heading, "════════════════════", ...messages].join("\n\n"),
    "تم نسخ جميع العينات المعروضة",
  );
});

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