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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Research Paper Metadata Database</title>
<style>
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
margin: 0;
padding: 20px;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
min-height: 100vh;
}
.container {
max-width: 1600px;
margin: 0 auto;
background: white;
border-radius: 15px;
box-shadow: 0 20px 40px rgba(0,0,0,0.1);
overflow: hidden;
}
.header {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
color: white;
padding: 30px;
text-align: center;
}
.header h1 {
margin: 0;
font-size: 2.5em;
font-weight: 300;
}
.header p {
margin: 10px 0 0 0;
opacity: 0.9;
font-size: 1.1em;
}
.controls {
padding: 20px 30px;
background: #f8f9fa;
border-bottom: 1px solid #ecf0f1;
display: flex;
flex-wrap: wrap;
gap: 15px;
align-items: center;
}
.search-box {
flex: 1;
min-width: 250px;
padding: 10px 15px;
border: 2px solid #ddd;
border-radius: 8px;
font-size: 1em;
}
.search-box:focus {
outline: none;
border-color: #667eea;
}
.filter-group {
display: flex;
gap: 10px;
flex-wrap: wrap;
}
.filter-select {
padding: 10px 15px;
border: 2px solid #ddd;
border-radius: 8px;
font-size: 0.9em;
background: white;
cursor: pointer;
}
.filter-select:focus {
outline: none;
border-color: #667eea;
}
.stats-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 20px;
padding: 30px;
background: #f8f9fa;
}
.stat-card {
background: white;
padding: 20px;
border-radius: 10px;
text-align: center;
box-shadow: 0 5px 15px rgba(0,0,0,0.08);
border-left: 4px solid #667eea;
}
.stat-number {
font-size: 2.5em;
font-weight: bold;
color: #2c3e50;
margin: 0;
}
.stat-label {
color: #7f8c8d;
font-size: 0.9em;
margin: 5px 0 0 0;
}
.table-container {
padding: 30px;
overflow-x: auto;
max-height: 70vh;
overflow-y: auto;
}
table {
width: 100%;
border-collapse: collapse;
font-size: 0.9em;
}
th, td {
padding: 12px 8px;
text-align: left;
border-bottom: 1px solid #ddd;
}
th {
background: #ecf0f1;
font-weight: 600;
color: #2c3e50;
position: sticky;
top: 0;
cursor: pointer;
user-select: none;
}
th:hover {
background: #d5dbdb;
}
tr:hover {
background: #f8f9fa;
}
.paper-title {
font-weight: 600;
color: #2c3e50;
max-width: 400px;
}
.paper-title a {
color: #667eea;
text-decoration: none;
}
.paper-title a:hover {
text-decoration: underline;
}
.authors {
max-width: 300px;
color: #7f8c8d;
font-size: 0.9em;
}
.journal {
color: #7f8c8d;
font-size: 0.9em;
}
.year {
text-align: center;
font-weight: 600;
}
.source-badge {
padding: 4px 8px;
border-radius: 4px;
font-size: 0.75em;
font-weight: 600;
text-transform: uppercase;
}
.source-pubmed {
background: #e3f2fd;
color: #1976d2;
}
.source-arxiv {
background: #fff3e0;
color: #f57c00;
}
.source-nasa {
background: #f3e5f5;
color: #7b1fa2;
}
.source-crossref {
background: #e8f5e9;
color: #388e3c;
}
.pagination {
padding: 20px 30px;
background: #f8f9fa;
display: flex;
justify-content: center;
align-items: center;
gap: 10px;
}
.pagination button {
padding: 8px 15px;
border: 1px solid #ddd;
background: white;
border-radius: 5px;
cursor: pointer;
font-size: 0.9em;
}
.pagination button:hover:not(:disabled) {
background: #667eea;
color: white;
border-color: #667eea;
}
.pagination button:disabled {
opacity: 0.5;
cursor: not-allowed;
}
.pagination-info {
margin: 0 20px;
color: #7f8c8d;
}
.loading {
text-align: center;
padding: 50px;
color: #7f8c8d;
}
.error {
text-align: center;
padding: 50px;
color: #e74c3c;
}
.abstract-preview {
max-width: 400px;
color: #7f8c8d;
font-size: 0.85em;
line-height: 1.4;
max-height: 60px;
overflow: hidden;
text-overflow: ellipsis;
}
</style>
</head>
<body>
<div class="container">
<div class="header">
<h1>📚 Research Paper Metadata Database</h1>
<p>CopernicusAI Knowledge Engine - Browse and Search Research Papers</p>
</div>
<div class="controls">
<input type="text" id="searchBox" class="search-box" placeholder="Search papers by title, author, abstract, keywords...">
<select id="sourceFilter" class="filter-select">
<option value="">All Sources</option>
<option value="pubmed">PubMed</option>
<option value="arxiv">arXiv</option>
<option value="nasa_ads">NASA ADS</option>
<option value="crossref">Crossref</option>
</select>
<select id="categoryFilter" class="filter-select">
<option value="">All Categories</option>
<option value="biology">Biology</option>
<option value="chemistry">Chemistry</option>
<option value="physics">Physics</option>
<option value="mathematics">Mathematics</option>
<option value="computer_science">Computer Science</option>
<option value="interdisciplinary">Interdisciplinary</option>
</select>
<select id="yearFilter" class="filter-select">
<option value="">All Years</option>
<!-- Years will be populated dynamically -->
</select>
<select id="sortBy" class="filter-select">
<option value="year_desc">Year (Newest)</option>
<option value="year_asc">Year (Oldest)</option>
<option value="title_asc">Title (A-Z)</option>
<option value="title_desc">Title (Z-A)</option>
</select>
</div>
<div class="stats-grid" id="statsGrid">
<div class="stat-card">
<p class="stat-number" id="totalPapers">0</p>
<p class="stat-label">Total Papers (in Firestore)</p>
</div>
<div class="stat-card">
<p class="stat-number" id="filteredPapers">0</p>
<p class="stat-label" id="filteredLabel">Results (this page)</p>
</div>
<div class="stat-card">
<p class="stat-number" id="pubmedCount">0</p>
<p class="stat-label" id="pubmedLabel">PubMed (this page)</p>
</div>
<div class="stat-card">
<p class="stat-number" id="arxivCount">0</p>
<p class="stat-label" id="arxivLabel">arXiv (this page)</p>
</div>
</div>
<div id="loading" class="loading">
<h3>Loading research papers...</h3>
<p>Fetching paper metadata from the CopernicusAI API</p>
<p class="hint" style="font-size:0.9em;color:#7f8c8d;margin-top:8px;">This page requires JavaScript. Search-engine and static previews do not run <code>fetch</code>, so they may show zero results or errors.</p>
</div>
<div id="error" class="error" style="display: none;">
<h3>❌ Error Loading Data</h3>
<p id="errorMessage">Could not fetch paper metadata. Please check your connection and try again.</p>
<p id="errorHint" style="font-size:0.9em;margin-top:10px;color:#555;"></p>
</div>
<noscript>
<div class="error" style="display:block;">
<h3>JavaScript required</h3>
<p>Enable JavaScript to load papers from the API. Or call the browse endpoint directly:
<a href="https://copernicus-podcast-api-phzp4ie2sq-uc.a.run.app/api/content/browse?content_type=papers&page=1&limit=1">browse API (JSON)</a>.</p>
</div>
</noscript>
<div id="content" style="display: none;">
<div class="table-container">
<table id="papersTable">
<thead>
<tr>
<th onclick="sortTable('title')">Title ↕</th>
<th onclick="sortTable('authors')">Authors ↕</th>
<th onclick="sortTable('journal')">Journal ↕</th>
<th onclick="sortTable('year')">Year ↕</th>
<th onclick="sortTable('source')">Source ↕</th>
<th>Abstract Preview</th>
<th>Links</th>
</tr>
</thead>
<tbody id="papersTableBody">
<!-- Papers will be populated here -->
</tbody>
</table>
</div>
<div class="pagination" id="pagination">
<button id="prevBtn" onclick="changePage(-1)">← Previous</button>
<span class="pagination-info" id="pageInfo">Page 1 of 1</span>
<button id="nextBtn" onclick="changePage(1)">Next →</button>
</div>
</div>
</div>
<script>
const API_BASE_URL = 'https://copernicus-podcast-api-phzp4ie2sq-uc.a.run.app';
let allPapers = []; // current in-memory dataset (either a single page, or search results)
let filteredPapers = [];
let currentPage = 1;
const itemsPerPage = 50; // UI page size
let totalPapersServer = 0; // server-reported total (browse mode)
let totalPagesServer = 1;
let isSearchMode = false; // when true, we show semantic results and disable server paging
let currentSort = { column: 'year', direction: 'desc' };
async function _fetchJson(url) {
const res = await fetch(url, { cache: 'no-store', mode: 'cors' });
if (!res.ok) {
const err = new Error(`HTTP ${res.status} from ${url}`);
err.status = res.status;
throw err;
}
return await res.json();
}
function _formatLoadError(err) {
const base = err && err.message ? err.message : String(err);
const api = API_BASE_URL + '/api/content/browse?content_type=papers&page=1&limit=1';
let hint = 'Open DevTools → Network, reload, and confirm this URL returns 200: ' + api;
if (err && (err.name === 'TypeError' || /Failed to fetch|NetworkError|Load failed/i.test(base))) {
hint += ' If the API is up, the failure is often ad-blockers, offline network, or opening this file as file:// (use the GCS HTTPS URL).';
}
return { base, hint };
}
function _paperFromBrowseItem(item) {
const md = item.metadata || {};
return {
id: item.id,
title: item.title,
authors: md.authors || [],
abstract: item.abstract || item.description || '',
journal: item.journal || '',
year: item.year || '',
source: item.source || (item.sources ? item.sources[0] : '') || '',
doi: item.doi || null,
pmid: item.pmid || null,
url: item.url || null,
category: item.discipline || '',
keywords: item.keywords || [],
};
}
async function loadBrowsePage(page) {
isSearchMode = false;
document.getElementById('loading').style.display = 'block';
document.getElementById('error').style.display = 'none';
document.getElementById('content').style.display = 'none';
const limit = itemsPerPage;
const data = await _fetchJson(`${API_BASE_URL}/api/content/browse?content_type=papers&page=${page}&limit=${limit}`);
totalPapersServer = data?.pagination?.total || 0;
totalPagesServer = data?.pagination?.pages || 1;
currentPage = data?.pagination?.page || page;
allPapers = (data.items || []).map(_paperFromBrowseItem);
filteredPapers = [...allPapers];
}
async function loadSearchResults(query) {
isSearchMode = true;
document.getElementById('loading').style.display = 'block';
document.getElementById('error').style.display = 'none';
document.getElementById('content').style.display = 'none';
const url = `${API_BASE_URL}/api/vector-search/semantic?query=${encodeURIComponent(query)}&content_types=papers&limit=100`;
const data = await _fetchJson(url);
allPapers = (data.papers || []).map(p => ({
id: p.paper_id || p.id,
title: p.title || 'Untitled',
authors: p.authors || [],
abstract: p.abstract || '',
journal: p.journal || p.journal_full || '',
year: (p.published_at || p.published_date || '').toString().slice(0, 4),
source: (Array.isArray(p.sources) && p.sources.length ? p.sources[0] : p.source) || '',
doi: p.doi || null,
pmid: p.pmid || null,
url: p.url || null,
category: p.discipline || '',
keywords: p.keywords || [],
}));
filteredPapers = [...allPapers];
currentPage = 1;
totalPapersServer = allPapers.length;
totalPagesServer = Math.ceil(allPapers.length / itemsPerPage) || 1;
}
// Load initial data (live, paged)
async function loadPapers() {
try {
await loadBrowsePage(1);
updateStats();
// In browse mode we don't have a global year list without scanning everything; leave year filter empty.
document.getElementById('loading').style.display = 'none';
document.getElementById('content').style.display = 'block';
applyFilters();
} catch (error) {
console.error('Error loading papers:', error);
document.getElementById('loading').style.display = 'none';
document.getElementById('error').style.display = 'block';
const { base, hint } = _formatLoadError(error);
document.getElementById('errorMessage').textContent = 'Could not load papers from the API. ' + base;
const hintEl = document.getElementById('errorHint');
if (hintEl) hintEl.textContent = hint;
}
}
function populateYearFilter() {
// Kept for backwards-compat; we don't populate years in paged mode.
}
function updateStats() {
document.getElementById('totalPapers').textContent = (totalPapersServer || allPapers.length).toLocaleString();
document.getElementById('filteredPapers').textContent = filteredPapers.length.toLocaleString();
const pubmed = filteredPapers.filter(p => (p.source || '').toLowerCase() === 'pubmed').length;
const arxiv = filteredPapers.filter(p => (p.source || '').toLowerCase() === 'arxiv').length;
document.getElementById('pubmedCount').textContent = pubmed.toLocaleString();
document.getElementById('arxivCount').textContent = arxiv.toLocaleString();
// Make the stats honest about scope:
// - Browse mode loads one server page at a time (limit=50), so counts are "this page".
// - Search mode loads up to 100 results client-side, so counts are "search results".
const filteredLabel = document.getElementById('filteredLabel');
const pubmedLabel = document.getElementById('pubmedLabel');
const arxivLabel = document.getElementById('arxivLabel');
if (filteredLabel && pubmedLabel && arxivLabel) {
if (isSearchMode) {
filteredLabel.textContent = 'Results (search results)';
pubmedLabel.textContent = 'PubMed (search results)';
arxivLabel.textContent = 'arXiv (search results)';
} else {
filteredLabel.textContent = 'Results (this page)';
pubmedLabel.textContent = 'PubMed (this page)';
arxivLabel.textContent = 'arXiv (this page)';
}
}
}
async function applyFilters() {
const searchTerm = document.getElementById('searchBox').value.toLowerCase();
const sourceFilter = document.getElementById('sourceFilter').value;
const categoryFilter = document.getElementById('categoryFilter').value;
const yearFilter = document.getElementById('yearFilter').value;
const sortBy = document.getElementById('sortBy').value;
// If user is searching, fetch semantic results (more useful than scanning only the current page).
if (searchTerm && searchTerm.length >= 3) {
try {
await loadSearchResults(searchTerm);
} catch (e) {
// If search fails, fall back to filtering whatever we have loaded.
isSearchMode = false;
}
} else if (isSearchMode) {
// Leaving search mode: return to browsing page 1
await loadBrowsePage(1);
}
filteredPapers = allPapers.filter(paper => {
// Search filter
if (searchTerm && !isSearchMode) {
const searchable = [
paper.title || '',
(paper.authors || []).join(' '),
paper.abstract || '',
(paper.keywords || []).join(' ')
].join(' ').toLowerCase();
if (!searchable.includes(searchTerm)) return false;
}
// Source filter
if (sourceFilter && paper.source !== sourceFilter) return false;
// Category filter
if (categoryFilter && paper.category !== categoryFilter) return false;
// Year filter
if (yearFilter && paper.year !== yearFilter) return false;
return true;
});
// Sort
sortPapers(sortBy);
currentPage = 1;
updateStats();
renderTable();
}
function sortPapers(sortBy) {
filteredPapers.sort((a, b) => {
let aVal, bVal;
switch(sortBy) {
case 'year_desc':
aVal = parseInt(a.year) || 0;
bVal = parseInt(b.year) || 0;
return bVal - aVal;
case 'year_asc':
aVal = parseInt(a.year) || 0;
bVal = parseInt(b.year) || 0;
return aVal - bVal;
case 'title_asc':
return (a.title || '').localeCompare(b.title || '');
case 'title_desc':
return (b.title || '').localeCompare(a.title || '');
default:
return 0;
}
});
}
function sortTable(column) {
// Toggle sort direction
if (currentSort.column === column) {
currentSort.direction = currentSort.direction === 'asc' ? 'desc' : 'asc';
} else {
currentSort.column = column;
currentSort.direction = 'asc';
}
filteredPapers.sort((a, b) => {
let aVal = a[column] || '';
let bVal = b[column] || '';
if (Array.isArray(aVal)) aVal = aVal.join(', ');
if (Array.isArray(bVal)) bVal = bVal.join(', ');
const comparison = String(aVal).localeCompare(String(bVal));
return currentSort.direction === 'asc' ? comparison : -comparison;
});
currentPage = 1;
renderTable();
}
function renderTable() {
const tbody = document.getElementById('papersTableBody');
tbody.innerHTML = '';
const start = (currentPage - 1) * itemsPerPage;
const end = start + itemsPerPage;
const pagePapers = filteredPapers.slice(start, end);
pagePapers.forEach(paper => {
const row = document.createElement('tr');
const title = paper.title || 'Untitled';
const authors = Array.isArray(paper.authors) ? paper.authors.join(', ') : (paper.author_string || 'Unknown');
const journal = paper.journal || paper.journal_full || 'Unknown';
const year = paper.year || 'N/A';
const source = paper.source || 'unknown';
const abstract = paper.abstract || '';
const abstractPreview = abstract.length > 200 ? abstract.substring(0, 200) + '...' : abstract;
// Build URL
let url = '#';
if (paper.doi) {
url = `https://doi.org/${paper.doi}`;
} else if (paper.url) {
url = paper.url;
} else if (paper.pmid) {
url = `https://pubmed.ncbi.nlm.nih.gov/${paper.pmid}`;
}
row.innerHTML = `
<td class="paper-title">
<a href="${url}" target="_blank">${title}</a>
</td>
<td class="authors">${authors}</td>
<td class="journal">${journal}</td>
<td class="year">${year}</td>
<td><span class="source-badge source-${source}">${source}</span></td>
<td class="abstract-preview">${abstractPreview}</td>
<td>
${paper.doi ? `<a href="https://doi.org/${paper.doi}" target="_blank" title="DOI">DOI</a>` : ''}
${paper.pmid ? `<a href="https://pubmed.ncbi.nlm.nih.gov/${paper.pmid}" target="_blank" title="PubMed">PubMed</a>` : ''}
${paper.url && !paper.doi && !paper.pmid ? `<a href="${paper.url}" target="_blank">Link</a>` : ''}
</td>
`;
tbody.appendChild(row);
});
// Update pagination
const totalPages = Math.ceil(filteredPapers.length / itemsPerPage) || 1;
const modeLabel = isSearchMode ? 'Search results' : 'Browse';
document.getElementById('pageInfo').textContent =
`${modeLabel}: Page ${currentPage} of ${totalPages} (${filteredPapers.length.toLocaleString()} papers shown)` +
(isSearchMode ? '' : ` • Total in DB: ${(totalPapersServer || 0).toLocaleString()}`);
document.getElementById('prevBtn').disabled = currentPage === 1;
document.getElementById('nextBtn').disabled = currentPage >= totalPages;
}
async function changePage(delta) {
// In browse mode, change pages via the API; in search mode, we paginate locally.
if (!isSearchMode) {
const newPage = currentPage + delta;
if (newPage >= 1 && newPage <= totalPagesServer) {
try {
await loadBrowsePage(newPage);
filteredPapers = [...allPapers];
updateStats();
renderTable();
document.getElementById('loading').style.display = 'none';
document.getElementById('content').style.display = 'block';
window.scrollTo({ top: 0, behavior: 'smooth' });
return;
} catch (e) {
console.error('Failed to page:', e);
}
}
}
const totalPages = Math.ceil(filteredPapers.length / itemsPerPage) || 1;
const newPage = currentPage + delta;
if (newPage >= 1 && newPage <= totalPages) {
currentPage = newPage;
renderTable();
window.scrollTo({ top: 0, behavior: 'smooth' });
}
}
// Event listeners
let _searchDebounce = null;
document.getElementById('searchBox').addEventListener('input', () => {
clearTimeout(_searchDebounce);
_searchDebounce = setTimeout(() => applyFilters(), 300);
});
document.getElementById('sourceFilter').addEventListener('change', applyFilters);
document.getElementById('categoryFilter').addEventListener('change', applyFilters);
document.getElementById('yearFilter').addEventListener('change', applyFilters);
document.getElementById('sortBy').addEventListener('change', () => {
applyFilters();
});
// Initial load
loadPapers();
</script>
</body>
</html>
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