import * as pdfjsLib from 'pdfjs-dist';
// Use jsdelivr CDN for worker - more reliable than unpkg
pdfjsLib.GlobalWorkerOptions.workerSrc = `https://cdn.jsdelivr.net/npm/pdfjs-dist@${pdfjsLib.version}/build/pdf.worker.min.mjs`;
export interface PDFExtractionResult {
text: string;
numPages: number;
success: boolean;
error?: string;
}
/**
* Extract text content from a PDF file
*/
export async function extractTextFromPDF(file: File): Promise<PDFExtractionResult> {
try {
console.log('📄 Starting PDF text extraction for:', file.name);
// Convert file to ArrayBuffer
const arrayBuffer = await file.arrayBuffer();
// Load the PDF document
const loadingTask = pdfjsLib.getDocument({ data: arrayBuffer });
const pdf = await loadingTask.promise;
console.log(`📊 PDF loaded: ${pdf.numPages} pages`);
let fullText = '';
// Extract text from each page
for (let pageNum = 1; pageNum <= pdf.numPages; pageNum++) {
const page = await pdf.getPage(pageNum);
const textContent = await page.getTextContent();
// Combine all text items from the page
const pageText = textContent.items
.map((item: any) => item.str)
.join(' ');
fullText += pageText + '\n\n';
console.log(`✅ Extracted page ${pageNum}/${pdf.numPages}`);
}
// Clean up the text
const cleanedText = fullText
.replace(/\s+/g, ' ') // Replace multiple spaces with single space
.replace(/\n\s*\n/g, '\n\n') // Remove excessive line breaks
.trim();
console.log(`✅ PDF extraction complete: ${cleanedText.length} characters`);
return {
text: cleanedText,
numPages: pdf.numPages,
success: true
};
} catch (error) {
console.error('❌ PDF extraction failed:', error);
return {
text: '',
numPages: 0,
success: false,
error: error instanceof Error ? error.message : 'Unknown error'
};
}
}
/**
* Extract a preview (first N characters) from PDF text
*/
export function getTextPreview(text: string, maxLength: number = 500): string {
if (text.length <= maxLength) {
return text;
}
// Try to cut at a sentence or word boundary
const preview = text.substring(0, maxLength);
const lastPeriod = preview.lastIndexOf('.');
const lastSpace = preview.lastIndexOf(' ');
if (lastPeriod > maxLength * 0.7) {
return preview.substring(0, lastPeriod + 1);
} else if (lastSpace > maxLength * 0.7) {
return preview.substring(0, lastSpace) + '...';
}
return preview + '...';
}
