{% extends "base.html" %}
{% block title %}Search Documents - DocuElevate{% endblock %}

{% block head_extra %}
  <script src="/static/js/common.js"></script>
  <style>
    .search-container { max-width: 800px; margin: 0 auto; }
    .search-box {
      display: flex; gap: 0.5rem; align-items: center;
      margin-bottom: 1.5rem;
    }
    .search-box input {
      flex: 1; padding: 0.75rem 1rem;
      border: 1px solid #d1d5db; border-radius: 0.5rem;
      font-size: 1rem; outline: none;
    }
    .search-box input:focus {
      border-color: #3b82f6; box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
    }
    .search-box button {
      padding: 0.75rem 1.5rem; background-color: #3b82f6;
      color: white; border: none; border-radius: 0.5rem;
      font-size: 1rem; cursor: pointer; font-weight: 600;
      white-space: nowrap;
    }
    .search-box button:hover { background-color: #2563eb; }
    .search-summary {
      font-size: 0.875rem; color: #6b7280;
      margin-bottom: 1rem;
    }
    /* Google-style result cards */
    .search-result {
      margin-bottom: 1.5rem;
    }
    .search-result-title a {
      font-size: 1.125rem; font-weight: 600;
      color: #1a0dab; text-decoration: none;
    }
    .search-result-title a:hover { text-decoration: underline; }
    .search-result-url {
      font-size: 0.8rem; color: #006621; margin-top: 0.1rem;
      word-break: break-all;
    }
    .search-result-meta {
      display: flex; flex-wrap: wrap; gap: 0.4rem;
      margin-top: 0.3rem;
    }
    .search-result-badge {
      display: inline-block; padding: 0.1rem 0.5rem;
      border-radius: 9999px; font-size: 0.7rem; font-weight: 500;
    }
    .badge-type { background: #eff6ff; color: #1d4ed8; }
    .badge-tag  { background: #f0fdf4; color: #15803d; }
    .badge-sender { background: #fef3c7; color: #92400e; }
    .search-result-snippet {
      font-size: 0.875rem; color: #4d5156;
      line-height: 1.5; margin-top: 0.35rem;
      word-break: break-word;
    }
    .search-result-snippet mark {
      background: #fef08a; font-weight: 600;
      border-radius: 2px; padding: 0 1px;
    }
    .search-pagination {
      display: flex; justify-content: center;
      gap: 0.5rem; margin-top: 2rem;
    }
    .search-pagination button {
      padding: 0.4rem 1rem; border: 1px solid #d1d5db;
      border-radius: 0.375rem; font-size: 0.875rem;
      cursor: pointer; background: white; color: #374151;
    }
    .search-pagination button:hover { background: #f3f4f6; }
    .search-pagination span {
      padding: 0.4rem 0.75rem; font-size: 0.875rem; color: #6b7280;
    }
    .search-empty {
      text-align: center; padding: 3rem 1rem; color: #9ca3af;
    }
    .search-empty i { font-size: 3rem; margin-bottom: 1rem; display: block; }
  </style>
{% endblock %}

{% block content %}
<div class="container mx-auto px-4 py-8">
  <div class="search-container">
    <h1 class="text-3xl font-bold mb-6"><i class="fas fa-search text-blue-500"></i> Document Search</h1>

    <!-- Search box -->
    <div class="search-box">
      <input
        type="text"
        id="search-input"
        placeholder="Search documents by content, sender, tags, type..."
        value="{{ query }}"
        autofocus
      >
      <button type="button" id="search-btn">
        <i class="fas fa-search"></i> Search
      </button>
    </div>

    <!-- Summary -->
    <div id="search-summary" class="search-summary" style="display:none;"></div>

    <!-- Results -->
    <div id="search-results"></div>

    <!-- Pagination -->
    <div id="search-pagination" class="search-pagination" style="display:none;"></div>
  </div>
</div>

<script>
  const searchInput  = document.getElementById('search-input');
  const searchBtn    = document.getElementById('search-btn');
  const resultsDiv   = document.getElementById('search-results');
  const summaryDiv   = document.getElementById('search-summary');
  const paginationDiv = document.getElementById('search-pagination');

  let _debounce = null;
  let _currentPage = 1;
  const PER_PAGE = 20;

  function doSearch(page) {
    const q = searchInput.value.trim();
    if (!q) {
      resultsDiv.innerHTML = '';
      summaryDiv.style.display = 'none';
      paginationDiv.style.display = 'none';
      return;
    }
    _currentPage = page || 1;

    // Update URL without reload
    const url = new URL(window.location);
    url.searchParams.set('q', q);
    window.history.replaceState({}, '', url);

    // Loading indicator
    resultsDiv.innerHTML = '<div style="text-align:center;padding:2rem;color:#6b7280;"><i class="fas fa-spinner fa-spin fa-2x"></i><p style="margin-top:0.75rem;">Searching…</p></div>';
    summaryDiv.style.display = 'none';
    paginationDiv.style.display = 'none';

    const params = new URLSearchParams({ q, page: _currentPage, per_page: PER_PAGE });
    fetch('/api/search?' + params.toString())
      .then(r => { if (!r.ok) throw new Error('Search returned ' + r.status); return r.json(); })
      .then(data => renderResults(data, q))
      .catch(err => {
        resultsDiv.innerHTML = '<div style="text-align:center;padding:2rem;color:#dc2626;"><i class="fas fa-exclamation-triangle fa-2x"></i><p style="margin-top:0.5rem;">Search is temporarily unavailable. Please try again in a moment.</p><p style="font-size:0.75rem;color:#9ca3af;margin-top:0.25rem;">' + escapeHtml(err.message) + '</p></div>';
      });
  }

  function escapeHtml(str) {
    const d = document.createElement('div');
    d.textContent = str;
    return d.innerHTML;
  }

  /**
   * Sanitize Meilisearch highlighted HTML: allow only <mark> tags,
   * escape everything else to prevent XSS from indexed content.
   */
  function sanitizeHighlight(html) {
    // Temporarily replace <mark> and </mark> with placeholders
    var safe = html
      .replace(/<mark>/gi,  '\x00MARK_OPEN\x00')
      .replace(/<\/mark>/gi, '\x00MARK_CLOSE\x00');
    // Escape all remaining HTML
    safe = escapeHtml(safe);
    // Restore the <mark> tags
    safe = safe
      .replace(/\x00MARK_OPEN\x00/g,  '<mark>')
      .replace(/\x00MARK_CLOSE\x00/g, '</mark>');
    return safe;
  }

  function renderResults(data, q) {
    const { results, total, page, pages } = data;

    // Summary
    summaryDiv.textContent = total + ' result' + (total !== 1 ? 's' : '') + ' for "' + q + '"';
    summaryDiv.style.display = 'block';

    if (!results || results.length === 0) {
      resultsDiv.innerHTML = '<div class="search-empty"><i class="fas fa-search"></i><p>No documents found matching your query.</p></div>';
      paginationDiv.style.display = 'none';
      return;
    }

    resultsDiv.innerHTML = results.map(function(hit) {
      var fmt = hit._formatted || {};
      var title = fmt.document_title || hit.document_title || hit.original_filename || '(untitled)';
      var filename = hit.original_filename || '';
      var snippet = fmt.ocr_text || '';
      var tags = Array.isArray(hit.tags) ? hit.tags : (hit.tags ? [hit.tags] : []);
      var docType = hit.document_type || '';
      var sender = hit.sender || hit.absender || '';
      var fileUrl = '/files/' + hit.file_id;

      // Build badges
      var badges = '';
      if (docType) badges += '<span class="search-result-badge badge-type">' + escapeHtml(docType) + '</span>';
      if (sender)  badges += '<span class="search-result-badge badge-sender"><i class="fas fa-user"></i> ' + escapeHtml(sender) + '</span>';
      tags.forEach(function(t) { badges += '<span class="search-result-badge badge-tag">' + escapeHtml(t) + '</span>'; });

      // Snippet: use highlighted text, truncate if very long
      var snippetHtml = '';
      if (snippet) {
        var trimmed = snippet.length > 500 ? snippet.substring(0, 500) + '…' : snippet;
        snippetHtml = '<div class="search-result-snippet">…' + sanitizeHighlight(trimmed) + '…</div>';
      }

      // Sanitize title (may contain <mark> highlights from _formatted)
      var safeTitle = (fmt.document_title) ? sanitizeHighlight(title) : escapeHtml(title);

      return '<div class="search-result">' +
        '<div class="search-result-title"><a href="' + escapeHtml(fileUrl) + '">' + safeTitle + '</a></div>' +
        '<div class="search-result-url">' + escapeHtml(filename) + '</div>' +
        (badges ? '<div class="search-result-meta">' + badges + '</div>' : '') +
        snippetHtml +
        '</div>';
    }).join('');

    // Pagination
    if (pages > 1) {
      var btns = [];
      if (page > 1) btns.push('<button data-page="' + (page - 1) + '">« Previous</button>');
      btns.push('<span>Page ' + page + ' of ' + pages + '</span>');
      if (page < pages) btns.push('<button data-page="' + (page + 1) + '">Next »</button>');
      paginationDiv.innerHTML = btns.join('');
      paginationDiv.style.display = 'flex';
    } else {
      paginationDiv.style.display = 'none';
    }
  }

  // Event delegation for pagination buttons
  paginationDiv.addEventListener('click', function(e) {
    var btn = e.target.closest('button[data-page]');
    if (btn) doSearch(parseInt(btn.getAttribute('data-page'), 10));
  });

  // Event listeners
  searchBtn.addEventListener('click', function() { doSearch(1); });
  searchInput.addEventListener('keydown', function(e) {
    if (e.key === 'Enter') { doSearch(1); }
  });
  searchInput.addEventListener('input', function() {
    clearTimeout(_debounce);
    var val = searchInput.value.trim();
    if (val.length < 2) {
      resultsDiv.innerHTML = '';
      summaryDiv.style.display = 'none';
      paginationDiv.style.display = 'none';
      return;
    }
    _debounce = setTimeout(function() { doSearch(1); }, 400);
  });

  // If q was provided via URL, search immediately
  if (searchInput.value.trim().length >= 2) {
    doSearch(1);
  }
</script>
{% endblock %}