Рефакторинг

src/lib/common/services/pdf.service.js

@@ -0,0 +1,51 @@
+// lib/common/services/pdf.service.js
+
+let pdfjsLib = null;
+
+async function getPdfJs() {
+	if (!pdfjsLib) {
+		pdfjsLib = await import('https://mozilla.github.io/pdf.js/build/pdf.mjs');
+		pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://mozilla.github.io/pdf.js/build/pdf.worker.mjs';
+	}
+	return pdfjsLib;
+}
+
+/**
+ * Загрузка PDF документа
+ * @param {File} file
+ */
+export async function loadPdfDocument(file) {
+	try {
+		const lib = await getPdfJs();
+		const arrayBuffer = await file.arrayBuffer();
+		const loadingTask = lib.getDocument({ data: arrayBuffer });
+		return await loadingTask.promise;
+	} catch (err) {
+		console.error('PDF load error:', err);
+		return null;
+	}
+}
+
+/**
+ * Рендер страницы PDF в DataURL изображения
+ * @param {any} pdfDoc
+ * @param {number} pageNum
+ * @param {number} scale
+ */
+export async function renderPageToImage(pdfDoc, pageNum, scale = 1.0) {
+	const page = await pdfDoc.getPage(pageNum);
+	const viewport = page.getViewport({ scale });
+	const canvas = document.createElement('canvas');
+	const context = canvas.getContext('2d');
+	const outputScale = window.devicePixelRatio || 1;
+
+	canvas.width = Math.floor(viewport.width * outputScale);
+	canvas.height = Math.floor(viewport.height * outputScale);
+	canvas.style.width = `${Math.floor(viewport.width)}px`;
+	canvas.style.height = `${Math.floor(viewport.height)}px`;
+
+	const transform = outputScale !== 1 ? [outputScale, 0, 0, outputScale, 0, 0] : undefined;
+
+	await page.render({ canvasContext: context, viewport, transform }).promise;
+	return canvas.toDataURL('image/jpeg', 0.85);
+}