import { extractText, getDocumentProxy } from "unpdf";

// Fetch a PDF file from the web
const buffer = await fetch(
  "https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf",
).then((res) => res.arrayBuffer());

// Or load it from the filesystem
const buffer = await readFile("./dummy.pdf");

// Load PDF from buffer
const pdf = await getDocumentProxy(new Uint8Array(buffer));
// Extract text from PDF
const { totalPages, text } = await extractText(pdf, { mergePages: true });

import { getResolvedPDFJS } from "unpdf";

const { getDocument } = await getResolvedPDFJS();
const data = Deno.readFileSync("dummy.pdf");
const doc = await getDocument(data).promise;

console.log(await doc.getMetadata());

for (let i = 1; i <= doc.numPages; i++) {
  const page = await doc.getPage(i);
  const textContent = await page.getTextContent();
  const contents = textContent.items.map((item) => item.str).join(" ");
  console.log(contents);
}

// Before using any other method, define the PDF.js module
// if you need another PDF.js build
import { configureUnPDF } from "unpdf";

configureUnPDF({
  // Use the official PDF.js build (make sure to install it first)
  pdfjs: () => import("pdfjs-dist"),
});

// Now, you can use the other methods
// …

interface UnPDFConfiguration {
  /**
   * By default, UnPDF will use the latest version of PDF.js compiled for
   * serverless environments. If you want to use a different version, you can
   * provide a custom resolver function.
   *
   * @example
   * // Use the official PDF.js build (make sure to install it first)
   * () => import('pdfjs-dist')
   */
  pdfjs?: () => Promise<PDFJS>;
}

function configureUnPDF(config: UnPDFConfiguration): Promise<void>;

function getResolvedPDFJS(): Promise<PDFJS>;

function getMeta(data: BinaryData | PDFDocumentProxy): Promise<{
  info: Record<string, any>;
  metadata: Record<string, any>;
}>;

function extractText(
  data: BinaryData | PDFDocumentProxy,
  { mergePages }?: { mergePages?: boolean },
): Promise<{
  totalPages: number;
  text: string | string[];
}>;

import { configureUnPDF, renderPageAsImage } from "unpdf";

configureUnPDF({
  // Use the official PDF.js build
  pdfjs: () => import("pdfjs-dist"),
});

const pdf = await readFile("./dummy.pdf");
const buffer = new Uint8Array(pdf);
const pageNumber = 1;

const result = await renderPageAsImage(buffer, pageNumber, {
  canvas: () => import("canvas"),
});
await writeFile("dummy-page-1.png", Buffer.from(result));

declare function renderPageAsImage(
  data: BinaryData,
  pageNumber: number,
  options?: {
    canvas?: () => Promise<typeof import("canvas")>;
    /** @default 1 */
    scale?: number;
    width?: number;
    height?: number;
  },
): Promise<ArrayBuffer>;