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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8"/>
  <meta name="viewport" content="width=device-width, initial-scale=1"/>
  <title>Contact Session | VCF Session</title>

  <style>
    :root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --success: #059669;
      --error: #dc2626;
      --warning: #d97706;
      --bg-primary: #ffffff;
      --bg-secondary: #f8fafc;
      --bg-card: #ffffff;
      --text-primary: #0f172a;
      --text-secondary: #64748b;
      --text-muted: #94a3b8;
      --border: #e2e8f0;
      --radius: 8px;
      --radius-lg: 12px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      --transition: all .2s cubic-bezier(.4,0,.2,1);
    }
    @media (prefers-color-scheme: dark) {
      :root {
        --primary: #3b82f6;
        --primary-hover: #2563eb;
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-card: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        --border: #334155;
      }
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html, body {
      height: 100%;
      font-family: var(--font-sans);
      background: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.6;
    }
    .container { min-height: 100vh; padding: 1rem; background: var(--bg-secondary); }
    .header { text-align: center; padding: 2rem 0; }
    .session-title { font-size: 1.875rem; font-weight: 700; margin-bottom: .5rem; }
    .session-status { display: flex; align-items: center; justify-content: center; gap: .5rem; color: var(--text-secondary); }
    .status-indicator { width: 8px; height: 8px; border-radius: 50%; background: var(--success); animation: pulse 2s infinite; }
    .status-indicator.expired { background: var(--error); animation: none; }
    @keyframes pulse { 50% { opacity: .5; } }
    .countdown { font-weight: 600; color: var(--primary); }
    .countdown.warning { color: var(--warning); }
    .countdown.expired { color: var(--error); }
    .main-content { max-width: 600px; margin: 0 auto; display: grid; gap: 2rem; }
    .card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: 0 4px 6px -1px rgb(0 0 0 / .1); padding: 2rem; }
    .card-header { margin-bottom: 1.5rem; }
    .card-title { font-size: 1.25rem; font-weight: 600; }
    .card-description { color: var(--text-secondary); font-size: .875rem; }
    .form-group { margin-bottom: 1rem; }
    .form-label { display: block; font-size: .875rem; font-weight: 600; margin-bottom: .5rem; }
    .form-input { width: 100%; padding: .75rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); font-size: 1rem; background: var(--bg-primary); color: var(--text-primary); }
    .form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgb(37 99 235 / .1); }
    .form-input.error { border-color: var(--error); }
    .error-text { color: var(--error); font-size: .75rem; margin-top: .25rem; display: none; }
    .add-btn { width: 100%; padding: .875rem 1.5rem; background: var(--primary); color: #fff; border: none; border-radius: var(--radius); font-size: 1rem; font-weight: 600; cursor: pointer; transition: var(--transition); }
    .add-btn:hover:not(:disabled) { background: var(--primary-hover); }
    .add-btn:disabled { background: var(--text-muted); cursor: not-allowed; }
    .success-message { background: #f0fdf4; border: 1px solid #bbf7d0; color: var(--success); padding: .75rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; display: none; }
    .download-section { text-align: center; }
    .download-btn { display: inline-flex; align-items: center; gap: .5rem; padding: .875rem 2rem; background: var(--success); color: #fff; text-decoration: none; border-radius: var(--radius); font-weight: 600; }
    .download-btn:hover { background: #047857; }
    .footer { text-align: center; padding: 2rem 1rem; color: var(--text-muted); font-size: .875rem; }
    .footer a { color: var(--primary); text-decoration: none; }
    .footer a:hover { text-decoration: underline; }
    .session-expired { text-align: center; padding: 3rem 1rem; }
    .expired-icon { width: 64px; height: 64px; background: var(--error); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 1.5rem; color: #fff; font-size: 2rem; }
    @media (max-width: 640px) { .container { padding: .5rem; } .card { padding: 1.5rem; } }
  </style>
</head>

<body>
  <div class="container">
    <div class="header">
      <h1 id="sessionTitle" class="session-title">Loading…</h1>
      <div class="session-status">
        <div id="statusIndicator" class="status-indicator"></div>
        <span>Session expires in <span id="countdown" class="countdown">--:--</span></span>
      </div>
    </div>

    <div class="main-content">
      <!-- Add-Contact Card -->
      <div id="contactForm" class="card">
        <div class="card-header">
          <h2 class="card-title">Add Your Contact</h2>
          <p class="card-description">Share your contact information with other participants</p>
        </div>

        <div id="successMessage" class="success-message">Contact added!</div>

        <form id="addContactForm">
          <div class="form-group">
            <label for="contactName" class="form-label">Full Name *</label>
            <input id="contactName" type="text" class="form-input" placeholder="John Doe" required autocomplete="name">
            <div id="nameError" class="error-text"></div>
          </div>

          <div class="form-group">
            <label for="contactPhone" class="form-label">Phone Number *</label>
            <input id="contactPhone" type="tel" class="form-input" placeholder="+1234567890" required autocomplete="tel">
            <div id="phoneError" class="error-text"></div>
          </div>

          <button type="submit" id="addBtn" class="add-btn">Add Contact</button>
        </form>
      </div>

      <!-- Expired Notice -->
      <div id="expiredCard" class="card" style="display:none;">
        <div class="session-expired">
          <div class="expired-icon"></div>
          <h2 class="card-title">Session Expired</h2>
          <p class="card-description">This session has ended. You may still download the collected contacts.</p>
        </div>
      </div>

      <!-- Download Section -->
      <div id="downloadSection" class="card" style="display:none;">
        <div class="download-section">
          <a id="downloadBtn" class="download-btn" href="">Download VCF File</a>
          <p class="card-description">Import the file into any contacts app</p>
        </div>
      </div>
    </div>

    <div class="footer">
      Join our WhatsApp group:
      <a href="https://chat.whatsapp.com/JRe69IJCINM3qYX3gM8MI9?mode=ems_copy_c" target="_blank" rel="noopener">VCF GROUP</a>
    </div>
  </div>

  <script>
    const sessionId = window.location.pathname.split('/').pop();
    if (!sessionId) window.location.href = '/';

    const sessionTitle = document.getElementById('sessionTitle');
    const statusInd = document.getElementById('statusIndicator');
    const countdown = document.getElementById('countdown');
    const contactForm = document.getElementById('contactForm');
    const expiredCard = document.getElementById('expiredCard');
    const downloadSect = document.getElementById('downloadSection');
    const downloadBtn = document.getElementById('downloadBtn');
    const addForm = document.getElementById('addContactForm');
    const successMsg = document.getElementById('successMessage');
    const nameInput = document.getElementById('contactName');
    const phoneInput = document.getElementById('contactPhone');
    const nameError = document.getElementById('nameError');
    const phoneError = document.getElementById('phoneError');

    let sessionData = null;
    let isExpired = false;
    let countdownTimer = null;

    const sanitize = str => str.replace(/[\x00-\x1F\x7F]/g, ' ').trim();

    async function loadSession() {
      const res = await fetch(`/api/session/${sessionId}`);
      if (!res.ok) { document.body.innerHTML = `<div class="card empty-state"><h2>Session Not Found</h2><a href="/">← Home</a></div>`; return; }
      sessionData = await res.json();
      sessionTitle.textContent = sessionData.name;
      startCountdown();
    }
    loadSession();

    function startCountdown() {
      function tick() {
        const left = sessionData.expiresAt - Date.now();
        if (left <= 0) {
          isExpired = true;
          countdown.textContent = 'Expired';
          countdown.classList.add('expired');
          statusInd.classList.add('expired');
          contactForm.style.display = 'none';
          expiredCard.style.display = 'block';
          downloadSect.style.display = 'block';
          downloadBtn.href = `/api/session/${sessionId}/contacts.vcf`;
          clearInterval(countdownTimer);
          return;
        }
        const m = String(Math.floor(left / 60000)).padStart(2, '0');
        const s = String(Math.floor((left % 60000) / 1000)).padStart(2, '0');
        countdown.textContent = `${m}:${s}`;
        if (left < 300000) countdown.classList.add('warning');
      }
      tick();
      countdownTimer = setInterval(tick, 1000);
    }

    function showError(el, msg) { el.classList.add('error'); el.nextElementSibling.textContent = msg; el.nextElementSibling.style.display = 'block'; }
    function hideError(el) { el.classList.remove('error'); el.nextElementSibling.style.display = 'none'; }

    addForm.addEventListener('submit', async e => {
      e.preventDefault();
      if (isExpired) return;

      const name = sanitize(nameInput.value);
      const phone = sanitize(phoneInput.value);

      let ok = true;
      if (!name) { showError(nameInput, 'Name required'); ok = false; } else hideError(nameInput);
      if (!phone) { showError(phoneInput, 'Phone required'); ok = false; } else hideError(phoneInput);
      if (!ok) return;

      const res = await fetch(`/api/session/${sessionId}/contact`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ name, phone })
      });

      if (res.ok) {
        successMsg.style.display = 'block';
        addForm.reset();
        await loadSession();
        setTimeout(() => successMsg.style.display = 'none', 3000);
      } else {
        const err = await res.json();
        alert(err.error || 'Failed to add contact');
      }
    });

    window.addEventListener('beforeunload', () => clearInterval(countdownTimer));
  </script>
</body>
</html>