<!DOCTYPE html>
<html th:lang="${#locale.language}" th:dir="#{language.direction}" th:data-language="${#locale.toString()}" xmlns:th="http://www.thymeleaf.org">
  <head>
  <th:block th:insert="~{fragments/common :: head(title=#{rotate.title}, header=#{rotate.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="#{rotate.header}"></h2>

              <form action="#" th:action="@{api/v1/general/rotate-pdf}" th:object="${rotateForm}" method="post" enctype="multipart/form-data">
                <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
                <input type="hidden" id="angleInput" name="angle" value="0">

                <div id="editSection" style="display: none">
                  <div id="previewContainer">
                    <!-- pdf-preview -->
                  </div>

                  <div class="buttonContainer">
                    <button type="button" class="btn btn-secondary" onclick="rotate(-90)">
                      <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-counterclockwise" viewBox="0 0 16 16">
                        <path fill-rule="evenodd" d="M8 3a5 5 0 1 1-4.546 2.914.5.5 0 0 0-.908-.417A6 6 0 1 0 8 2v1z" />
                        <path d="M8 4.466V.534a.25.25 0 0 0-.41-.192L5.23 2.308a.25.25 0 0 0 0 .384l2.36 1.966A.25.25 0 0 0 8 4.466z" />
                      </svg>
                    </button>
                    <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{rotate.submit}"></button>
                    <button type="button" class="btn btn-secondary" onclick="rotate(90)">
                      <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-clockwise" viewBox="0 0 16 16">
                        <path fill-rule="evenodd" d="M8 3a5 5 0 1 0 4.546 2.914.5.5 0 0 1 .908-.417A6 6 0 1 1 8 2v1z" />
                        <path d="M8 4.466V.534a.25.25 0 0 1 .41-.192l2.36 1.966c.12.1.12.284 0 .384L8.41 4.658A.25.25 0 0 1 8 4.466z" />
                      </svg>
                    </button>
                  </div>
                </div>
              </form>
            </div>
          </div>
        </div>
      </div>
      <th:block th:insert="~{fragments/footer.html :: footer}"></th:block>
    </div>
    <script>
      const angleInput = document.getElementById("angleInput");
      const fileInput = document.getElementById("fileInput-input");
      const previewContainer = document.getElementById("previewContainer");
      // const preview = document.getElementById("pdf-preview");
      fileInput.addEventListener("change", async function() {
        console.log("loading pdf");

        document.querySelector("#editSection").style.display = "";

        var url = URL.createObjectURL(fileInput.files[0])
        pdfjsLib.GlobalWorkerOptions.workerSrc = 'pdfjs/pdf.worker.js'
        const pdf = await pdfjsLib.getDocument(url).promise;
        const page = await pdf.getPage(1);

        const canvas = document.createElement("canvas");

        // set the canvas size to the size of the page
        if (page.rotate == 90 || page.rotate == 270) {
          canvas.width = page.view[3];
          canvas.height = page.view[2];
        } else {
          canvas.width = page.view[2];
          canvas.height = page.view[3];
        }

        // render the page onto the canvas
        var renderContext = {
          canvasContext: canvas.getContext("2d"),
          viewport: page.getViewport({ scale: 1 })
        };

        await page.render(renderContext).promise;
        const  preview = document.createElement("img");
        preview.id = "pdf-preview";
        preview.alt = "preview";
        preview.src = canvas.toDataURL();
        previewContainer.appendChild(preview);
      });

      function rotate(deg) {
        const preview = document.getElementById("pdf-preview");
        var lastTransform = preview.style.rotate;
        if (!lastTransform) {
          lastTransform = "0";
        }
        const lastAngle = parseInt(lastTransform.replace(/[^\d-]/g, ''));
        const newAngle = lastAngle + deg;
        preview.style.rotate = newAngle + "deg";
        angleInput.value = newAngle;
      }
    </script>
  </body>
</html>