// ===== Utility functions (global scope) =====

function escHtml(s) {
  if (s === null || s === undefined) return '';
  return String(s)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#039;');
}

function escAttr(s) {
  return escHtml(s);
}

function formatDistance(meters) {
  if (!meters && meters !== 0) return '';
  if (meters === 0) return '0 m';
  if (meters >= 1000) return (meters / 1000).toFixed(2) + ' km';
  return Math.round(meters) + ' m';
}

function formatDate(dateStr) {
  if (!dateStr) return '';
  const d = new Date(dateStr);
  if (isNaN(d.getTime())) return '';
  return d.toLocaleDateString();
}

let _toastTimeout;
function showToast(msg, type) {
  const toast = document.getElementById('upload-toast');
  const text = document.getElementById('upload-toast-text');
  if (!toast || !text) return;
  text.textContent = msg;
  toast.className = type || '';
  toast.style.display = 'block';
  clearTimeout(_toastTimeout);
  _toastTimeout = setTimeout(() => { toast.style.display = 'none'; }, 3000);
}

function showUploadToast(msg) {
  const toast = document.getElementById('upload-toast');
  const text = document.getElementById('upload-toast-text');
  if (!toast || !text) return;
  text.textContent = msg;
  toast.className = '';
  toast.style.display = 'block';
}

function hideUploadToast() {
  setTimeout(() => {
    const toast = document.getElementById('upload-toast');
    if (toast) toast.style.display = 'none';
  }, 1000);
}

// ===== Admin Panel =====

async function loadAdminPanel() {
  const content = document.getElementById('admin-content');
  content.innerHTML = '<div class="loading">Loading...</div>';
  try {
    const users = await API.adminGetUsers();
    let html = `<div style="overflow-x:auto">
      <table class="admin-table">
        <thead>
          <tr>
            <th>ID</th>
            <th>Login</th>
            <th>Email</th>
            <th>Admin</th>
            <th>Active</th>
            <th>Tracks</th>
            <th>Created</th>
            <th>Actions</th>
          </tr>
        </thead>
        <tbody>`;
    for (const u of users) {
      html += `<tr>
        <td>${u.id}</td>
        <td>${escHtml(u.login)}</td>
        <td>${escHtml(u.email || '')}</td>
        <td>${u.isAdmin ? '✓' : ''}</td>
        <td>${u.isActive ? '✓' : '✗'}</td>
        <td>${u.trackCount || 0}</td>
        <td>${formatDate(u.createdAt)}</td>
        <td>
          ${!u.isActive
            ? `<button class="btn-small btn-primary" onclick="adminActivate(${u.id}, true)">Activate</button>`
            : `<button class="btn-small btn-secondary" onclick="adminActivate(${u.id}, false)">Deactivate</button>`
          }
          ${!u.isAdmin
            ? `<button class="btn-small btn-secondary" onclick="adminSetAdmin(${u.id}, true)">Make Admin</button>`
            : `<button class="btn-small btn-secondary" onclick="adminSetAdmin(${u.id}, false)">Revoke Admin</button>`
          }
          <button class="btn-small btn-danger" onclick="adminDeleteUser(${u.id})">Delete</button>
        </td>
      </tr>`;
    }
    html += '</tbody></table></div>';
    content.innerHTML = html;
  } catch (e) {
    content.innerHTML = '<div class="error-msg">Error: ' + escHtml(e.message) + '</div>';
  }
}

async function adminActivate(userId, isActive) {
  try {
    await API.adminActivate(userId, isActive);
    await loadAdminPanel();
    showToast(isActive ? 'User activated' : 'User deactivated', 'success');
  } catch (e) {
    showToast('Error: ' + e.message, 'error');
  }
}

async function adminSetAdmin(userId, isAdmin) {
  try {
    await API.adminSetAdmin(userId, isAdmin);
    await loadAdminPanel();
    showToast(isAdmin ? 'Admin rights granted' : 'Admin rights revoked', 'success');
  } catch (e) {
    showToast('Error: ' + e.message, 'error');
  }
}

async function adminDeleteUser(userId) {
  document.getElementById('confirm-title').textContent = 'Delete User';
  document.getElementById('confirm-message').textContent = 'Delete this user and ALL their data? This cannot be undone.';
  const modal = document.getElementById('confirm-modal');
  modal.style.display = 'flex';
  document.getElementById('confirm-ok-btn').onclick = async () => {
    modal.style.display = 'none';
    try {
      await API.adminDeleteUser(userId);
      await loadAdminPanel();
      showToast('User deleted', 'success');
    } catch (e) {
      showToast('Error: ' + e.message, 'error');
    }
  };
}

// ===== Share Page (no auth) =====

async function initSharePage(code) {
  document.getElementById('auth-page').style.display = 'none';
  document.getElementById('app').style.display = 'flex';
  document.getElementById('app').style.flexDirection = 'column';

  const sidebar = document.getElementById('sidebar');
  if (sidebar) sidebar.style.display = 'none';

  const appName = escHtml(window.APP_CONFIG?.appName || 'GPX Visualizer');
  document.getElementById('topbar').innerHTML = `
    <div id="topbar-left">
      <span id="topbar-title">${appName}</span>
    </div>
    <div id="topbar-right">
      <span style="color:rgba(255,255,255,0.6);font-size:13px">Shared track</span>
    </div>
  `;

  MapView.init();

  const panel = document.getElementById('track-info-panel');
  const infoContent = document.getElementById('track-info-content');

  try {
    const data = await API.getShared(code);
    MapView.addTrack(data, 'shared');
    MapView.fitTrack('shared');

    panel.style.display = 'block';
    infoContent.innerHTML = `
      <h3>${escHtml(data.meta?.name || 'Shared Track')}</h3>
      <div class="info-row"><label>Distance</label><span>${formatDistance(data.meta?.totalDistance)}</span></div>
      <div class="info-row"><label>Points</label><span>${data.meta?.pointCount || 0}</span></div>
      ${data.meta?.trackDate ? `<div class="info-row"><label>Date</label><span>${formatDate(data.meta.trackDate)}</span></div>` : ''}
    `;
  } catch (e) {
    panel.style.display = 'block';
    infoContent.innerHTML = '<div class="error-msg">Track not found or link has expired.</div>';
  }

  document.getElementById('track-info-close').onclick = () => {
    panel.style.display = 'none';
  };

  // Update document title
  document.title = (window.APP_CONFIG?.appName || 'GPX Visualizer') + ' - Shared Track';
}

// ===== Main Init =====

async function main() {
  const appName = window.APP_CONFIG?.appName || 'GPX Visualizer';
  document.title = appName;
  document.getElementById('app-title').textContent = appName;
  document.getElementById('topbar-title').textContent = appName;

  // Check if this is a share link
  const path = window.location.pathname;
  const shareMatch = path.match(/\/share\/([a-z0-9]+)$/i);
  if (shareMatch) {
    await initSharePage(shareMatch[1]);
    return;
  }

  // Setup modal close buttons
  document.querySelectorAll('.modal-close').forEach(btn => {
    btn.addEventListener('click', () => {
      const modal = document.getElementById(btn.dataset.modal);
      if (modal) modal.style.display = 'none';
    });
  });

  // Click outside modal to close
  document.querySelectorAll('.modal').forEach(modal => {
    modal.addEventListener('click', (e) => {
      if (e.target === modal) modal.style.display = 'none';
    });
  });

  // Keyboard: Escape to close modals
  document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') {
      document.querySelectorAll('.modal').forEach(modal => {
        if (modal.style.display !== 'none') modal.style.display = 'none';
      });
    }
  });

  // Sidebar tabs
  document.querySelectorAll('.sidebar-tab').forEach(btn => {
    btn.addEventListener('click', () => {
      document.querySelectorAll('.sidebar-tab').forEach(b => b.classList.remove('active'));
      btn.classList.add('active');
      document.querySelectorAll('.sidebar-tab-content').forEach(c => c.style.display = 'none');
      const tab = btn.dataset.tab;
      const tabEl = document.getElementById(tab + '-tab');
      if (tabEl) tabEl.style.display = 'flex';
      if (tab === 'stats') Stats.init();
    });
  });

  // Sidebar toggle
  const sidebar = document.getElementById('sidebar');
  document.getElementById('sidebar-toggle-btn').addEventListener('click', () => {
    sidebar.classList.toggle('collapsed');
    // Invalidate map size after transition
    setTimeout(() => {
      const m = MapView.getMap();
      if (m) m.invalidateSize();
    }, 250);
  });

  // Check auth
  Auth.setupForms();
  const loggedIn = await Auth.init();

  if (!loggedIn) {
    document.getElementById('auth-page').style.display = 'flex';
    document.getElementById('app').style.display = 'none';
    return;
  }

  // Show app
  document.getElementById('auth-page').style.display = 'none';
  document.getElementById('app').style.display = 'flex';

  const user = Auth.getCurrentUser();
  document.getElementById('topbar-user').textContent = user.login;
  document.title = appName + ' - ' + user.login;

  if (user.isAdmin) {
    const adminBtn = document.getElementById('admin-btn');
    adminBtn.style.display = '';
    adminBtn.addEventListener('click', () => {
      document.getElementById('admin-modal').style.display = 'flex';
      loadAdminPanel();
    });
  }

  document.getElementById('logout-btn').addEventListener('click', Auth.logout);

  // Init map
  MapView.init();

  // Init browser
  await Browser.init();

  // Restore open track from hash
  const params = MapView.getHashParams();
  if (params.open) {
    const trackId = parseInt(params.open);
    if (!isNaN(trackId)) {
      try {
        const data = await API.getTrackPoints(trackId);
        MapView.addTrack(data, trackId);
        // Don't fit if we already have a saved map position
        if (!params.map) {
          MapView.fitTrack(trackId);
        }
        MapView.setCurrentTrack(trackId);
        // Show track info panel
        if (data.meta) {
          const panel = document.getElementById('track-info-panel');
          document.getElementById('track-info-content').innerHTML = `
            <h3>${escHtml(data.meta.name || 'Track')}</h3>
            <div class="info-row"><label>Distance</label><span>${formatDistance(data.meta.totalDistance)}</span></div>
            <div class="info-row"><label>Points</label><span>${data.meta.pointCount || 0}</span></div>
            ${data.meta.trackDate ? `<div class="info-row"><label>Date</label><span>${formatDate(data.meta.trackDate)}</span></div>` : ''}
          `;
          panel.style.display = 'block';
          document.getElementById('track-info-close').onclick = () => { panel.style.display = 'none'; };
        }
      } catch (e) {
        console.warn('Could not restore track from hash:', e.message);
      }
    }
  }
}

document.addEventListener('DOMContentLoaded', main);