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⚡ Bolt: Optimize PDF search and date handling #14

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⚡ Bolt: Optimize PDF search and date handling #14

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81 changes: 69 additions & 12 deletions script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,50 @@ const categoryIcons = {
'Syllabus': 'fa-list-alt'
};

/**
* ⚡ OPTIMIZATION: Pre-calculate search strings and dates.
* This avoids expensive .toLowerCase() and new Date() calls inside the render loop.
* Properties are non-enumerable to prevent localStorage bloat.
*/
function prepareSearchIndex() {
const now = new Date();
const oneWeekMs = 7 * 24 * 60 * 60 * 1000;

pdfDatabase.forEach(pdf => {
// Skip if already prepared (optional check)
if (pdf._searchStr) return;

// Pre-calculate Search String
const searchStr = (
(pdf.title || "") + " " +
(pdf.description || "") + " " +
(pdf.category || "") + " " +
(pdf.author || "")
).toLowerCase();

// Pre-calculate Date
let formattedDate = "";
let isNew = false;

try {
const uploadDateObj = new Date(pdf.uploadDate);
formattedDate = uploadDateObj.toLocaleDateString('en-US', {
year: 'numeric', month: 'short', day: 'numeric'
});
isNew = (now - uploadDateObj) < oneWeekMs;
} catch (e) {
console.warn("Date parse error for PDF", pdf.id);
}

// Use defineProperty to keep them out of localStorage serialization
Object.defineProperties(pdf, {
_searchStr: { value: searchStr, writable: true, configurable: true, enumerable: false },
_formattedDate: { value: formattedDate, writable: true, configurable: true, enumerable: false },
_isNew: { value: isNew, writable: true, configurable: true, enumerable: false }
});
});
}

function renderCategoryFilters() {
const container = document.getElementById('categoryFilters');
if (!container) return;
Expand Down Expand Up @@ -451,6 +495,7 @@ async function loadPDFDatabase() {

if (shouldUseCache) {
pdfDatabase = cachedData;
prepareSearchIndex(); // ⚡ Optimize after cache load
// --- FIX: CALL THIS TO POPULATE UI ---
syncClassSwitcher();
renderSemesterTabs();
Expand All @@ -474,6 +519,7 @@ async function loadPDFDatabase() {
data: pdfDatabase
}));

prepareSearchIndex(); // ⚡ Optimize after fresh fetch
// --- FIX: CALL THIS TO POPULATE UI ---
syncClassSwitcher();
renderPDFs();
Expand Down Expand Up @@ -915,10 +961,15 @@ function renderPDFs() {
matchesCategory = currentCategory === 'all' || pdf.category === currentCategory;
}

const matchesSearch = pdf.title.toLowerCase().includes(searchTerm) ||
pdf.description.toLowerCase().includes(searchTerm) ||
pdf.category.toLowerCase().includes(searchTerm) ||
pdf.author.toLowerCase().includes(searchTerm);
// ⚡ OPTIMIZED SEARCH: Use pre-calculated _searchStr
const matchesSearch = pdf._searchStr
? pdf._searchStr.includes(searchTerm)
: (
(pdf.title || "").toLowerCase().includes(searchTerm) ||
(pdf.description || "").toLowerCase().includes(searchTerm) ||
(pdf.category || "").toLowerCase().includes(searchTerm) ||
(pdf.author || "").toLowerCase().includes(searchTerm)
);

// Update return statement to include matchesClass
return matchesSemester && matchesClass && matchesCategory && matchesSearch;
Expand Down Expand Up @@ -991,9 +1042,20 @@ function createPDFCard(pdf, favoritesList, index = 0, highlightRegex = null) {
const heartIconClass = isFav ? 'fas' : 'far';
const btnActiveClass = isFav ? 'active' : '';

const uploadDateObj = new Date(pdf.uploadDate);
const timeDiff = new Date() - uploadDateObj;
const isNew = timeDiff < (7 * 24 * 60 * 60 * 1000); // 7 days
// ⚡ OPTIMIZED: Use pre-calculated values
let isNew, formattedDate;

if (typeof pdf._isNew !== 'undefined') {
isNew = pdf._isNew;
formattedDate = pdf._formattedDate;
} else {
const uploadDateObj = new Date(pdf.uploadDate);
const timeDiff = new Date() - uploadDateObj;
isNew = timeDiff < (7 * 24 * 60 * 60 * 1000); // 7 days
formattedDate = uploadDateObj.toLocaleDateString('en-US', {
year: 'numeric', month: 'short', day: 'numeric'
});
}

const newBadgeHTML = isNew
? `<span style="background:var(--error-color); color:white; font-size:0.6rem; padding:2px 6px; border-radius:4px; margin-left:8px; vertical-align:middle;">NEW</span>`
Expand All @@ -1007,11 +1069,6 @@ function createPDFCard(pdf, favoritesList, index = 0, highlightRegex = null) {
};
const categoryIcon = categoryIcons[pdf.category] || 'fa-file-pdf';

// Formatting Date
const formattedDate = new Date(pdf.uploadDate).toLocaleDateString('en-US', {
year: 'numeric', month: 'short', day: 'numeric'
});

// Uses global escapeHtml() now

const highlightText = (text) => {
Expand Down