<!DOCTYPE html>
<html th:lang="${#locale.language}" th:lang-direction="#{language.direction}" th:language="${#locale.toString()}" xmlns:th="http://www.thymeleaf.org">
  <head>
  <th:block th:insert="~{fragments/common :: head(title=#{removeAnnotations.title}, header=#{removeAnnotations.header})}"></th:block>
  </head>

  <body>
    <div id="page-container">
      <div id="content-wrap">
        <th:block th:insert="~{fragments/navbar.html :: navbar}"></th:block>
        <br /><br />
        <div class="container">
          <div class="row justify-content-center">
            <div class="col-md-6">
              <h2 th:text="#{removeAnnotations.header}"></h2>
              <form id="pdfForm" class="mb-3">
                <div class="custom-file">
                  <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf', remoteCall='false')}"></div>
                </div>
                <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{removeAnnotations.submit}"></button>
              </form>
            </div>
          </div>
        </div>
      </div>
      <th:block th:insert="~{fragments/footer.html :: footer}"></th:block>
    </div>
    <script src="js/local-pdf-input-download.js"></script>
    <script>
      document.getElementById('pdfForm').addEventListener('submit', async (e) => {
        e.preventDefault();

        const { PDFDocument } = PDFLib;

        const processFile = async (file) => {
          const origFileUrl = URL.createObjectURL(file);
          const formPdfBytes = await fetch(origFileUrl).then(res => res.arrayBuffer());
          const pdfDoc = await PDFDocument.load(formPdfBytes, { ignoreEncryption: true });

          const pages = pdfDoc.getPages();

          for (let i = 0; i < pages.length; ++i) {
            const page = pages[i];
            const annotations = page.node.Annots();
            if (!annotations) continue;
            const ctx = annotations.context;

            for (let j = 0; j < annotations.size(); ++j) {
              const annotation = annotations.get(j);
              ctx.delete(annotation);
            }
          }

          const pdfBytes = await pdfDoc.save();
          const pdfBlob = new Blob([pdfBytes], { type: 'application/pdf' });
          const fileName = (file.name ? file.name.replace('.pdf', '') : 'pdf') + '_removed_annotations.pdf';

          return { processedData: pdfBlob, fileName };
        };

        await downloadFilesWithCallback(processFile);
      });
    </script>
  </body>
</html>