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import isNodeJs from "detect-node";
import { PDFWorker } from "../dist/cache/worker";
import { PDFWorkerHelper } from "./worker-helper";
import { getFileUrl } from "./file";
import { ScoreInfo, SheetInfo, Dimensions } from "./scoreinfo";
import { fetchBuffer } from "./utils";
type _ExFn = (
imgURLs: string[],
imgType: "svg" | "png",
dimensions: Dimensions
) => Promise<ArrayBuffer>;
const _exportPDFBrowser: _ExFn = async (imgURLs, imgType, dimensions) => {
const worker = new PDFWorkerHelper();
const pdfArrayBuffer = await worker.generatePDF(
imgURLs,
imgType,
dimensions.width,
dimensions.height
);
worker.terminate();
return pdfArrayBuffer;
};
const _exportPDFNode: _ExFn = async (imgURLs, imgType, dimensions) => {
const imgBufs = await Promise.all(imgURLs.map((url) => fetchBuffer(url)));
const { generatePDF } = PDFWorker();
const pdfArrayBuffer = (await generatePDF(
imgBufs,
imgType,
dimensions.width,
dimensions.height
)) as ArrayBuffer;
return pdfArrayBuffer;
};
export const exportPDF = async (
scoreinfo: ScoreInfo,
sheet: SheetInfo,
scoreUrl = ""
): Promise<ArrayBuffer> => {
const imgType = sheet.imgType;
const pageCount = sheet.pageCount;
const rs = Array.from({ length: pageCount }).map((_, i) => {
if (i === 0) {
// The url to the first page is static. We don't need to use API to obtain it.
return sheet.thumbnailUrl;
} else {
// obtain image urls using the API
return getFileUrl(scoreinfo.id, "img", scoreUrl, i);
}
});
const sheetImgURLs = await Promise.all(rs);
const args = [sheetImgURLs, imgType, sheet.dimensions] as const;
if (!isNodeJs) {
return _exportPDFBrowser(...args);
} else {
return _exportPDFNode(...args);
}
};
let pdfBlob: Blob;
export const downloadPDF = async (
scoreinfo: ScoreInfo,
sheet: SheetInfo,
saveAs: typeof import("file-saver").saveAs
): Promise<void> => {
const name = scoreinfo.fileName;
if (pdfBlob) {
return saveAs(pdfBlob, `${name}.pdf`);
}
const pdfArrayBuffer = await exportPDF(scoreinfo, sheet);
pdfBlob = new Blob([pdfArrayBuffer]);
saveAs(pdfBlob, `${name}.pdf`);
};
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