import './style.css';
import './app.css';
import logoUrl from './assets/logo.jpeg';

const brandLogoHtml = `<img src="${logoUrl}" alt="Simple Care" class="brand-logo-img" />`;

// Trạng thái cục bộ
let loggedIn = false;
let studentInfo = null;
let stats = {
  wifiSSID: '',
  onlineSecs: 0,
  offlineSecs: 0,
  wsConnected: false,
  serverReachable: false,
  allowedApps: '',
  monitorMode: '',
  monitorLabel: '',
  className: '',
  classCode: '',
  currentPeriod: 0,
  currentCourseName: '',
  shifts: []
};

let chatOpen = false;
let chatMessages = [];
let chatConversations = [];
let activeStaffId = 0;
let chatAudioCtx = null;

function playChatSound() {
  try {
    const Ctx = window.AudioContext || window.webkitAudioContext;
    if (!chatAudioCtx) chatAudioCtx = new Ctx();
    const ctx = chatAudioCtx;
    if (ctx.state === 'suspended') ctx.resume();
    const tone = (freq, start, dur) => {
      const osc = ctx.createOscillator();
      const gain = ctx.createGain();
      osc.type = 'sine';
      osc.frequency.value = freq;
      gain.gain.setValueAtTime(0.0001, start);
      gain.gain.exponentialRampToValueAtTime(0.15, start + 0.02);
      gain.gain.exponentialRampToValueAtTime(0.0001, start + dur);
      osc.connect(gain);
      gain.connect(ctx.destination);
      osc.start(start);
      osc.stop(start + dur + 0.02);
    };
    const t = ctx.currentTime;
    tone(880, t, 0.12);
    tone(1174, t + 0.14, 0.14);
  } catch {
    /* ignore */
  }
}

// Quản lý webcam
let webcamStream = null;
let webcamInterval = null;
const webcamVideo = document.createElement('video');
webcamVideo.autoplay = true;
webcamVideo.playsInline = true;
webcamVideo.style.display = 'none';
document.body.appendChild(webcamVideo);

const webcamCanvas = document.createElement('canvas');
webcamCanvas.width = 320;
webcamCanvas.height = 240;
webcamCanvas.style.display = 'none';
document.body.appendChild(webcamCanvas);

function init() {
  if (typeof window.go === 'undefined' || typeof window.go.main === 'undefined') {
    setTimeout(init, 200);
    return;
  }

  window.runtime.EventsOn('start_webcam_stream', startWebcam);
  window.runtime.EventsOn('stop_webcam_stream', stopWebcam);
  window.runtime.EventsOn('chat:message', (data) => {
    updateChatBadge();
    loadChatConversations().catch(console.error);
    if (chatOpen && activeStaffId) loadChatMessages(activeStaffId).catch(console.error);
    if (data?.senderRole === 'staff') {
      playChatSound();
    }
  });
  window.runtime.EventsOn('chat:notify', (data) => {
    updateChatBadge();
    showChatToast(data);
    playChatSound();
  });
  checkLogin();
}

async function checkLogin() {
  try {
    const isLogged = await window.go.main.App.CheckLoginStatus();
    if (isLogged) {
      loggedIn = true;
      studentInfo = await window.go.main.App.GetStudentInfo();
      renderDashboard();
      startStatsTicker();
      ensureChatWidget();
      updateChatBadge();
    } else {
      loggedIn = false;
      renderLoginPrompt();
    }
  } catch (err) {
    console.error('Error checking login status:', err);
  }
}

function renderLoginPrompt() {
  document.querySelector('#app').innerHTML = `
    <div class="login-prompt-container">
      <div class="card">
        <div class="login-brand-row">
          ${brandLogoHtml}
          <div class="login-brand-text">
            <div class="login-brand-name">Simple Care</div>
            <div class="login-brand-sub">Rikkei Education</div>
          </div>
        </div>
        <h2 class="login-title">Đăng nhập sinh viên</h2>
        <p class="login-desc">
          Ứng dụng sẽ chuyển hướng bạn đến trang Rikkei Portal. Sau khi đăng nhập thành công, hệ thống sẽ tự động đồng bộ tài khoản học tập của bạn.
        </p>
        <button class="btn btn-primary" id="btn-goto-login" style="width: 100%; padding: 0.75rem;">
          Đi đến trang đăng nhập
        </button>
      </div>
    </div>
  `;

  document.getElementById('btn-goto-login').addEventListener('click', () => {
    window.go.main.App.NavigateToLogin();
  });
}

function monitorModeMeta(mode) {
  switch (mode) {
    case 'learning':
      return { icon: '🛡️', label: 'Đang giám sát', cls: 'mode-learning' };
    case 'exam':
      return { icon: '📝', label: 'Phòng thi', cls: 'mode-exam' };
    case 'outside_schedule':
      return { icon: '😴', label: 'Ngoài giờ học', cls: 'mode-outside' };
    case 'not_configured':
      return { icon: '⚙️', label: 'Chưa sẵn sàng', cls: 'mode-config' };
    default:
      return { icon: '⏳', label: 'Đang kết nối', cls: 'mode-pending' };
  }
}

function attendanceClass(status) {
  if (status === 4) return 'att-ok';
  if (status === 3) return 'att-late';
  if (status === 1 || status === 2) return 'att-leave';
  if (status === 0) return 'att-absent';
  return 'att-pending';
}

function renderShiftsTable(shifts) {
  if (!shifts || shifts.length === 0) {
    return '<div class="shifts-empty">Hôm nay không có ca học theo lịch lớp.</div>';
  }
  return `
    <table class="shifts-table">
      <thead>
        <tr>
          <th>Ca</th>
          <th>Môn học</th>
          <th>Giờ</th>
          <th>Trực tuyến</th>
          <th>Ngoại tuyến</th>
          <th>Điểm danh</th>
        </tr>
      </thead>
      <tbody>
        ${shifts.map(s => `
          <tr class="${s.isActiveNow ? 'shift-row-active' : ''}">
            <td><strong>Ca ${s.period}</strong>${s.isActiveNow ? ' <span class="shift-now">đang học</span>' : ''}</td>
            <td>${s.courseName || '—'}</td>
            <td class="shift-time">${s.startTime}–${s.endTime}</td>
            <td class="time-online">${formatDuration(s.onlineSeconds || 0)}</td>
            <td class="time-offline">${formatDuration(s.offlineSeconds || 0)}</td>
            <td><span class="att-badge ${attendanceClass(s.attendanceStatus)}">${s.attendanceLabel || 'Chưa tính'}</span></td>
          </tr>
        `).join('')}
      </tbody>
    </table>
  `;
}

function renderDashboard() {
  if (!studentInfo) return;

  const mode = monitorModeMeta(stats.monitorMode);
  const classLine = stats.className
    ? `${stats.className}${stats.classCode ? ` (${stats.classCode})` : ''}`
    : 'Đang xác định lớp...';

  document.querySelector('#app').innerHTML = `
    <div class="dashboard-wrapper">
      <header class="header">
        <div class="brand">
          ${brandLogoHtml}
          <div class="brand-text">
            <span class="brand-name">Simple Care</span>
            <span class="brand-sub">Rikkei Education</span>
          </div>
        </div>
        <button class="btn btn-logout" id="btn-logout">Đăng xuất</button>
      </header>

      <div class="main-grid">
        <div class="card profile-card">
          <div class="avatar-container">
            <img src="${studentInfo.avatar || 'https://via.placeholder.com/150'}" alt="Avatar" class="avatar" />
            <div class="status-indicator ${stats.serverReachable ? 'online' : 'offline'}"></div>
          </div>
          <h2 class="student-name">${studentInfo.fullName}</h2>
          <div class="student-code">${studentInfo.studentCode}</div>
          <p class="student-email">${studentInfo.email}</p>
          <div class="divider"></div>
          <div class="profile-info-row">
            <span>Lớp</span>
            <strong id="profile-class">${classLine}</strong>
          </div>
          <div class="profile-info-row">
            <span>Điện thoại</span>
            <strong>${studentInfo.phone || 'Chưa cung cấp'}</strong>
          </div>
        </div>

        <div class="right-column">
          <div class="card status-banner ${mode.cls}">
            <div class="status-banner-icon" id="status-icon">${mode.icon}</div>
            <div class="status-banner-main">
              <div class="status-banner-top">
                <span class="monitor-mode-tag" id="monitor-mode-tag">${mode.label}</span>
                <span class="status-class-line" id="status-class-line">${classLine}</span>
              </div>
              <div class="status-banner-value" id="status-message">${stats.monitorLabel || stats.statusMsg || 'Đang kết nối...'}</div>
              <div class="status-banner-sub" id="status-sub">
                ${stats.currentPeriod > 0 && stats.currentCourseName
                  ? `Ca ${stats.currentPeriod} · ${stats.currentCourseName}`
                  : 'Theo dõi theo lịch học của lớp'}
              </div>
            </div>
          </div>

          <div class="stats-grid stats-grid--two">
            <div class="card stat-card">
              <div class="stat-icon-wrap">📡</div>
              <div class="stat-info">
                <div class="stat-title">WiFi</div>
                <div class="stat-value" id="wifi-ssid">${stats.wifiSSID || 'Đang quét...'}</div>
              </div>
            </div>
            <div class="card stat-card">
              <div class="stat-icon-wrap">🖥️</div>
              <div class="stat-info">
                <div class="stat-title">Máy chủ</div>
                <div class="stat-value" id="server-status" style="color: ${stats.serverReachable ? 'var(--online-color)' : 'var(--offline-color)'}">
                  ${stats.serverReachable ? 'Đã kết nối' : 'Mất kết nối'}
                </div>
              </div>
            </div>
          </div>

          <div class="clocks-card card">
            <div class="card-title-row card-title-row--shifts">
              <div class="card-title">Hôm nay — theo ca</div>
              <div class="clock-inline">
                <span class="clock-inline-item" title="Tổng trực tuyến"><span class="clock-inline-dot online"></span><strong id="clock-online" class="online">00:00:00</strong></span>
                <span class="clock-inline-sep">·</span>
                <span class="clock-inline-item" title="Tổng ngoại tuyến"><span class="clock-inline-dot offline"></span><strong id="clock-offline" class="offline">00:00:00</strong></span>
                <span class="card-title-sub" id="session-date">${stats.sessionDate || ''}</span>
              </div>
            </div>
            <div class="shifts-wrap" id="shifts-wrap">
              ${renderShiftsTable(stats.shifts)}
            </div>
          </div>
        </div>
      </div>
    </div>
  `;

  document.getElementById('btn-logout').addEventListener('click', async () => {
    if (confirm('Bạn có chắc chắn muốn đăng xuất khỏi ứng dụng giám sát?')) {
      loggedIn = false;
      studentInfo = null;
      stopWebcam();
      const w = document.getElementById('student-chat-widget');
      if (w) w.remove();
      await window.go.main.App.Logout();
    }
  });
}

function ensureChatWidget() {
  if (document.getElementById('student-chat-widget')) return;
  const wrap = document.createElement('div');
  wrap.id = 'student-chat-widget';
  wrap.className = 'student-chat-dock';
  wrap.innerHTML = `
    <div class="student-chat-toast" id="student-chat-toast" hidden></div>
    <button type="button" class="student-chat-fab" id="student-chat-fab" title="Tin nhắn">
      💬<span class="student-chat-badge" id="student-chat-badge" hidden>0</span>
    </button>
    <div class="student-chat-messenger" id="student-chat-messenger" hidden>
      <header class="student-chat-messenger-head">
        <strong>Tin nhắn</strong>
        <button type="button" class="student-chat-close" id="student-chat-close">×</button>
      </header>
      <div class="student-chat-messenger-body">
        <aside class="student-chat-sidebar" id="student-chat-conv-list"></aside>
        <section class="student-chat-thread">
          <div class="student-chat-thread-head" id="student-chat-thread-head">Chọn hội thoại</div>
          <div class="student-chat-messages" id="student-chat-messages"></div>
          <div class="student-chat-compose">
            <input id="student-chat-input" placeholder="Nhập tin nhắn..." disabled />
            <button type="button" class="btn btn-primary btn-sm" id="student-chat-send" disabled>Gửi</button>
          </div>
        </section>
      </div>
    </div>
  `;
  document.body.appendChild(wrap);
  document.getElementById('student-chat-fab').addEventListener('click', toggleChat);
  document.getElementById('student-chat-close').addEventListener('click', () => setChatOpen(false));
  document.getElementById('student-chat-send').addEventListener('click', sendStudentChat);
  document.getElementById('student-chat-input').addEventListener('keydown', (e) => {
    if (e.key === 'Enter') { e.preventDefault(); sendStudentChat(); }
  });
}

function showChatToast(data) {
  const toast = document.getElementById('student-chat-toast');
  if (!toast) return;
  const from = data?.from || 'Giảng viên';
  const preview = data?.preview || 'Bạn có tin nhắn mới';
  toast.innerHTML = `<strong>${escapeHtml(from)}</strong><span>${escapeHtml(preview)}</span>`;
  toast.hidden = false;
  clearTimeout(showChatToast._t);
  showChatToast._t = setTimeout(() => { toast.hidden = true; }, 5000);
}

function setChatOpen(open) {
  chatOpen = open;
  const panel = document.getElementById('student-chat-messenger');
  if (panel) panel.hidden = !open;
  if (open) {
    loadChatConversations().catch(console.error);
    if (activeStaffId) loadChatMessages(activeStaffId).catch(console.error);
  }
}

function toggleChat() {
  setChatOpen(!chatOpen);
}

async function loadChatConversations() {
  const rows = await window.go.main.App.GetChatConversations();
  chatConversations = Array.isArray(rows) ? rows : [];
  renderChatConversations();
  updateChatBadge();
}

function renderChatConversations() {
  const list = document.getElementById('student-chat-conv-list');
  if (!list) return;
  if (!chatConversations.length) {
    list.innerHTML = '<div class="student-chat-empty">Chưa có tin nhắn</div>';
    return;
  }
  list.innerHTML = chatConversations.map((c) => {
    const sid = Number(c.staffId || 0);
    const unread = Number(c.unread || 0);
    const active = sid === activeStaffId ? ' active' : '';
    const name = escapeHtml(c.staffName || c.staffEmail || 'Giảng viên');
    const preview = escapeHtml(c.lastMessage || '');
    return `<button type="button" class="student-chat-conv-btn${active}" data-staff-id="${sid}">
      <span class="student-chat-conv-name">${name}${unread > 0 ? `<em class="student-chat-conv-unread">${unread}</em>` : ''}</span>
      <span class="student-chat-conv-preview">${preview}</span>
    </button>`;
  }).join('');
  list.querySelectorAll('.student-chat-conv-btn').forEach((btn) => {
    btn.addEventListener('click', () => {
      const sid = Number(btn.getAttribute('data-staff-id'));
      pickStaffChat(sid);
    });
  });
}

async function pickStaffChat(staffId) {
  activeStaffId = staffId;
  const head = document.getElementById('student-chat-thread-head');
  const conv = chatConversations.find((c) => Number(c.staffId) === staffId);
  if (head) head.textContent = conv?.staffName || conv?.staffEmail || 'Giảng viên';
  const input = document.getElementById('student-chat-input');
  const sendBtn = document.getElementById('student-chat-send');
  if (input) input.disabled = !staffId;
  if (sendBtn) sendBtn.disabled = !staffId;
  renderChatConversations();
  if (staffId) await loadChatMessages(staffId);
}

async function loadChatMessages(staffId) {
  const msgs = await window.go.main.App.GetChatMessages(staffId);
  chatMessages = Array.isArray(msgs) ? msgs : [];
  renderChatMessages();
  updateChatBadge();
  loadChatConversations().catch(console.error);
}

function renderChatMessages() {
  const box = document.getElementById('student-chat-messages');
  if (!box) return;
  if (!chatMessages.length) {
    box.innerHTML = '<div class="student-chat-empty">Chưa có tin nhắn</div>';
    return;
  }
  box.innerHTML = chatMessages.map((m) => {
    const role = m.senderRole === 'student' ? 'student' : 'staff';
    const time = m.createdAt ? new Date(m.createdAt).toLocaleTimeString('vi-VN', { hour: '2-digit', minute: '2-digit' }) : '';
    const label = role === 'staff' ? (m.staffName || 'Giảng viên') : 'Bạn';
    return `<div class="student-chat-bubble student-chat-bubble--${role}"><div class="student-chat-label">${label}</div><div class="student-chat-body">${escapeHtml(m.body || '')}</div><div class="student-chat-time">${time}</div></div>`;
  }).join('');
  box.scrollTop = box.scrollHeight;
}

function escapeHtml(s) {
  return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

async function sendStudentChat() {
  const input = document.getElementById('student-chat-input');
  if (!input || !input.value.trim() || !activeStaffId) return;
  try {
    await window.go.main.App.SendChatMessage(input.value.trim());
    input.value = '';
    await loadChatMessages(activeStaffId);
  } catch (err) {
    alert(err?.message || err || 'Gửi tin thất bại');
  }
}

async function updateChatBadge() {
  const badge = document.getElementById('student-chat-badge');
  if (!badge || !window.go?.main?.App?.GetChatUnread) return;
  try {
    const n = await window.go.main.App.GetChatUnread();
    if (n > 0) {
      badge.hidden = false;
      badge.textContent = n > 9 ? '9+' : String(n);
    } else {
      badge.hidden = true;
    }
  } catch {
    /* ignore */
  }
}

function formatDuration(totalSeconds) {
  const hrs = Math.floor(totalSeconds / 3600);
  const mins = Math.floor((totalSeconds % 3600) / 60);
  const secs = totalSeconds % 60;
  const pad = (num) => String(num).padStart(2, '0');
  return `${pad(hrs)}:${pad(mins)}:${pad(secs)}`;
}

function startStatsTicker() {
  const pullStats = async () => {
    if (!loggedIn) return;
    try {
      const freshStats = await window.go.main.App.GetStats();
      stats = { ...stats, ...freshStats };
      if (!Array.isArray(stats.shifts)) stats.shifts = [];

      const wifiEl = document.getElementById('wifi-ssid');
      if (wifiEl) wifiEl.innerText = stats.wifiSSID || 'Không có WiFi';

      const serverEl = document.getElementById('server-status');
      if (serverEl) {
        serverEl.innerText = stats.serverReachable ? 'Đã kết nối' : 'Mất kết nối';
        serverEl.style.color = stats.serverReachable ? 'var(--online-color)' : 'var(--offline-color)';
      }

      const statusMsgEl = document.getElementById('status-message');
      if (statusMsgEl) {
        statusMsgEl.innerText = stats.monitorLabel || stats.statusMsg || 'Đang kết nối...';
      }

      const mode = monitorModeMeta(stats.monitorMode);
      const statusIconEl = document.getElementById('status-icon');
      if (statusIconEl) statusIconEl.innerText = mode.icon;

      const modeTagEl = document.getElementById('monitor-mode-tag');
      if (modeTagEl) modeTagEl.innerText = mode.label;

      const banner = document.querySelector('.status-banner');
      if (banner) banner.className = `card status-banner ${mode.cls}`;

      const classLine = stats.className
        ? `${stats.className}${stats.classCode ? ` (${stats.classCode})` : ''}`
        : 'Đang xác định lớp...';
      const classLineEl = document.getElementById('status-class-line');
      if (classLineEl) classLineEl.innerText = classLine;
      const profileClassEl = document.getElementById('profile-class');
      if (profileClassEl) profileClassEl.innerText = classLine;

      const statusSubEl = document.getElementById('status-sub');
      if (statusSubEl) {
        statusSubEl.innerText = stats.currentPeriod > 0 && stats.currentCourseName
          ? `Ca ${stats.currentPeriod} · ${stats.currentCourseName}`
          : 'Theo dõi theo lịch học của lớp';
      }

      const onlineEl = document.getElementById('clock-online');
      if (onlineEl) onlineEl.innerText = formatDuration(stats.onlineSecs || 0);

      const offlineEl = document.getElementById('clock-offline');
      if (offlineEl) offlineEl.innerText = formatDuration(stats.offlineSecs || 0);

      const shiftsWrap = document.getElementById('shifts-wrap');
      if (shiftsWrap) shiftsWrap.innerHTML = renderShiftsTable(stats.shifts);

      const sessionDateEl = document.getElementById('session-date');
      if (sessionDateEl && stats.sessionDate) sessionDateEl.innerText = stats.sessionDate;

      const indicator = document.querySelector('.status-indicator');
      if (indicator) {
        indicator.className = `status-indicator ${stats.serverReachable ? 'online' : 'offline'}`;
      }

      updateChatBadge();
    } catch (err) {
      console.error('Error fetching stats:', err);
    }
  };
  pullStats();
  setInterval(pullStats, 1000);
}

async function startWebcam() {
  if (webcamStream) return;
  try {
    webcamStream = await navigator.mediaDevices.getUserMedia({
      video: { width: 320, height: 240, frameRate: { max: 10 } }
    });
    webcamVideo.srcObject = webcamStream;
    webcamInterval = setInterval(() => {
      const ctx = webcamCanvas.getContext('2d');
      if (ctx) {
        ctx.drawImage(webcamVideo, 0, 0, webcamCanvas.width, webcamCanvas.height);
        const dataUrl = webcamCanvas.toDataURL('image/jpeg', 0.4);
        window.go.main.App.SendWebcamFrame(dataUrl);
      }
    }, 250);
  } catch (err) {
    console.error('Failed to open webcam:', err);
  }
}

function stopWebcam() {
  if (webcamInterval) {
    clearInterval(webcamInterval);
    webcamInterval = null;
  }
  if (webcamStream) {
    webcamStream.getTracks().forEach(track => track.stop());
    webcamStream = null;
  }
  webcamVideo.srcObject = null;
}

init();