<!DOCTYPE html>
<html th:lang="${#locale.language}" th:dir="#{language.direction}" th:data-language="${#locale.toString()}" xmlns:th="https://www.thymeleaf.org">
  <head>
  <th:block th:insert="~{fragments/common :: head(title=#{sign.title}, header=#{sign.header})}"></th:block>
    <link rel="stylesheet" th:href="@{'/css/sign.css'}">

    <th:block th:each="font : ${fonts}">
    <style th:inline="text">
      @font-face {
        font-family: "[[${font.name}]]";
        src: url('fonts/[[${font.name}]].[[${font.extension}]]') format('[[${font.type}]]');
      }

      #font-select option[value="[[${font.name}]]"] {
        font-family: "[[${font.name}]]",
        cursive;
      }
    </style>
    </th:block>

    <script th:src="@{'/js/thirdParty/signature_pad.umd.min.js'}"></script>
    <script th:src="@{'/js/thirdParty/interact.min.js'}"></script>
  </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 bg-card">
              <div class="tool-header">
                <span class="material-symbols-rounded tool-header-icon sign">signature</span>
                <span class="tool-header-text" th:text="#{sign.header}"></span>
              </div>

              <!-- pdf selector -->
              <div th:replace="~{fragments/common :: fileSelector(name='pdf-upload', multipleInputsForSingleRequest=false, disableMultipleFiles=true, accept='application/pdf')}"></div>
              <script type="module" th:src="@{'/pdfjs-legacy/pdf.mjs'}"></script>
              <script>
                let currentPreviewSrc = null;

                function toggleSignatureView() {
                  const gridView = document.getElementById('gridView');
                  const listView = document.getElementById('listView');
                  const gridText = document.querySelector('.grid-view-text');
                  const listText = document.querySelector('.list-view-text');

                  if (gridView.style.display !== 'none') {
                    gridView.style.display = 'none';
                    listView.style.display = 'block';
                    gridText.style.display = 'none';
                    listText.style.display = 'inline';
                  } else {
                    gridView.style.display = 'block';
                    listView.style.display = 'none';
                    gridText.style.display = 'inline';
                    listText.style.display = 'none';
                  }
                }

                function previewSignature(element) {
                  const src = element.dataset.src;
                  currentPreviewSrc = src;

                  // Extract filename from the data source path
                  const filename = element.querySelector('.signature-list-name').textContent;

                  // Update preview modal
                  const previewImage = document.getElementById('previewImage');
                  const previewFileName = document.getElementById('previewFileName');

                  previewImage.src = src;
                  previewFileName.textContent = filename;

                  const modal = new bootstrap.Modal(document.getElementById('signaturePreview'));
                  modal.show();
                }

                function addSignatureFromPreview() {
                  if (currentPreviewSrc) {
                    DraggableUtils.createDraggableCanvasFromUrl(currentPreviewSrc);
                    bootstrap.Modal.getInstance(document.getElementById('signaturePreview')).hide();
                  }
                }


                let originalFileName = '';
                document.querySelector('input[name=pdf-upload]').addEventListener('change', async (event) => {
                  const file = event.target.files[0];
                  if (file) {
                    originalFileName = file.name.replace(/\.[^/.]+$/, "");
                    const pdfData = await file.arrayBuffer();
                    pdfjsLib.GlobalWorkerOptions.workerSrc = './pdfjs-legacy/pdf.worker.mjs';
                    const pdfDoc = await pdfjsLib.getDocument({ data: pdfData }).promise;
                    await DraggableUtils.renderPage(pdfDoc, 0);

                    document.querySelectorAll(".show-on-file-selected").forEach(el => {
                      el.style.cssText = '';
                    });
                  }
                });
                document.addEventListener("DOMContentLoaded", () => {
                  document.querySelectorAll(".show-on-file-selected").forEach(el => {
                    el.style.cssText = "display:none !important";
                  });
                });
              </script>

              <div class="tab-group show-on-file-selected">
                <div class="tab-container" th:title="#{sign.upload}">
                  <div th:replace="~{fragments/common :: fileSelector(name='image-upload', disableMultipleFiles=true, multipleInputsForSingleRequest=true, accept='image/*', inputText=#{imgPrompt})}"></div>
                  <script>
                    const imageUpload = document.querySelector('input[name=image-upload]');
                    imageUpload.addEventListener('change', e => {
                      if (!e.target.files) return;
                      for (const imageFile of e.target.files) {
                        var reader = new FileReader();
                        reader.readAsDataURL(imageFile);
                        reader.onloadend = function (e) {
                          DraggableUtils.createDraggableCanvasFromUrl(e.target.result);
                        };
                      }
                    });
                  </script>
                </div>

                <div class="tab-container drawing-pad-container" th:title="#{sign.draw}">
                  <canvas id="drawing-pad-canvas"></canvas>
                  <br>
                  <button id="clear-signature" class="btn btn-outline-danger mt-2" onclick="signaturePad.clear()" th:text="#{sign.clear}"></button>
                  <button id="save-signature" class="btn btn-outline-success mt-2" onclick="addDraggableFromPad()" th:text="#{sign.add}"></button>
                  <script>
                    const signaturePadCanvas = document.getElementById('drawing-pad-canvas');
                    const signaturePad = new SignaturePad(signaturePadCanvas, {
                      minWidth: 1,
                      maxWidth: 2,
                      penColor: 'black',
                    });

                    function addDraggableFromPad() {
                      if (signaturePad.isEmpty()) return;
                      const startTime = Date.now();
                      const croppedDataUrl = getCroppedCanvasDataUrl(signaturePadCanvas);
                      console.log(Date.now() - startTime);
                      DraggableUtils.createDraggableCanvasFromUrl(croppedDataUrl);
                    }

                    function getCroppedCanvasDataUrl(canvas) {
                      let originalCtx = canvas.getContext('2d');
                      let originalWidth = canvas.width;
                      let originalHeight = canvas.height;
                      let imageData = originalCtx.getImageData(0, 0, originalWidth, originalHeight);

                      let minX = originalWidth + 1, maxX = -1, minY = originalHeight + 1, maxY = -1, x = 0, y = 0, currentPixelColorValueIndex;

                      for (y = 0; y < originalHeight; y++) {
                        for (x = 0; x < originalWidth; x++) {
                          currentPixelColorValueIndex = (y * originalWidth + x) * 4;
                          let currentPixelAlphaValue = imageData.data[currentPixelColorValueIndex + 3];
                          if (currentPixelAlphaValue > 0) {
                            if (minX > x) minX = x;
                            if (maxX < x) maxX = x;
                            if (minY > y) minY = y;
                            if (maxY < y) maxY = y;
                          }
                        }
                      }

                      let croppedWidth = maxX - minX;
                      let croppedHeight = maxY - minY;
                      if (croppedWidth < 0 || croppedHeight < 0) return null;
                      let cuttedImageData = originalCtx.getImageData(minX, minY, croppedWidth, croppedHeight);

                      let croppedCanvas = document.createElement('canvas'),
                          croppedCtx = croppedCanvas.getContext('2d');

                      croppedCanvas.width = croppedWidth;
                      croppedCanvas.height = croppedHeight;
                      croppedCtx.putImageData(cuttedImageData, 0, 0);

                      return croppedCanvas.toDataURL();
                    }

                    function resizeCanvas() {
                      var ratio = Math.max(window.devicePixelRatio || 1, 1);
                      var additionalFactor = 10;

                      signaturePadCanvas.width = signaturePadCanvas.offsetWidth * ratio * additionalFactor;
                      signaturePadCanvas.height = signaturePadCanvas.offsetHeight * ratio * additionalFactor;
                      signaturePadCanvas.getContext("2d").scale(ratio * additionalFactor, ratio * additionalFactor);

                      signaturePad.clear();
                    }

                    new IntersectionObserver((entries, observer) => {
                      if (entries.some(entry => entry.intersectionRatio > 0)) {
                        resizeCanvas();
                      }
                    }).observe(signaturePadCanvas);

                    new ResizeObserver(resizeCanvas).observe(signaturePadCanvas);
                  </script>
                </div>

                <div class="tab-container" th:title="#{sign.saved}">
                  <div class="saved-signatures-section" th:if="${not #lists.isEmpty(signatures)}">
                    <!-- View Toggle Button -->
                    <div class="view-toggle mb-3">
                      <button class="btn btn-outline-secondary btn-sm" onclick="toggleSignatureView()">
                        <span class="material-symbols-rounded grid-view-text">view_list</span>
                        <span class="material-symbols-rounded list-view-text" style="display: none;">grid_view</span>
                      </button>
                    </div>

                    <!-- Preview Modal -->
                    <div class="modal fade" id="signaturePreview" tabindex="-1">
                      <div class="modal-dialog modal-dialog-centered">
                        <div class="modal-content">
                          <div class="modal-header">
                            <h5 class="modal-title"><span id="previewFileName"></span></h5>
                            <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                          </div>
                          <div class="modal-body text-center">
                            <img id="previewImage" src="" alt="Signature Preview" style="max-width: 100%;">
                          </div>
                          <div class="modal-footer">
                            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal" th:text="#{close}"></button>
                            <button type="button" class="btn btn-primary" onclick="addSignatureFromPreview()" th:text="#{addToDoc}">Add to Document</button>
                          </div>
                        </div>
                      </div>
                    </div>

                    <!-- Grid View -->
                    <div id="gridView">
                      <!-- Personal Signatures -->
                      <div class="signature-category" th:if="${not #lists.isEmpty(signatures.?[category == 'Personal'])}">
                        <h5 th:text="#{sign.personalSigs}"></h5>
                        <div class="signature-grid">
                          <div th:each="sig : ${signatures}" th:if="${sig.category == 'Personal'}" class="signature-item">
                            <img th:src="@{'/api/v1/general/sign/' + ${sig.fileName}}" th:alt="${sig.fileName}" th:data-filename="${sig.fileName}" style="max-width: 200px; cursor: pointer;" onclick="DraggableUtils.createDraggableCanvasFromUrl(this.src)"/>
                            <div class="signature-name" th:text="${sig.fileName}"></div>
                          </div>
                        </div>
                      </div>

                      <!-- Shared Signatures -->
                      <div class="signature-category" th:if="${not #lists.isEmpty(signatures.?[category == 'Shared'])}">
                        <h5 th:text="#{sign.sharedSigs}"></h5>
                        <div class="signature-grid">
                          <div th:each="sig : ${signatures}" th:if="${sig.category == 'Shared'}" class="signature-item">
                            <img th:src="@{'/api/v1/general/sign/' + ${sig.fileName}}" th:alt="${sig.fileName}" th:data-filename="${sig.fileName}" style="max-width: 200px; cursor: pointer;" onclick="DraggableUtils.createDraggableCanvasFromUrl(this.src)"/>
                            <div class="signature-name" th:text="${sig.fileName}"></div>
                          </div>
                        </div>
                      </div>
                    </div>

                    <!-- List View (Initially Hidden) -->
                    <div id="listView" style="display: none;">
                      <!-- Personal Signatures -->
                      <div class="signature-category" th:if="${not #lists.isEmpty(signatures.?[category == 'Personal'])}">
                        <h5 th:text="#{sign.personalSigs}"></h5>
                        <div class="signature-list">
                          <div th:each="sig : ${signatures}" th:if="${sig.category == 'Personal'}" class="signature-list-item" th:data-src="@{'/api/v1/general/sign/' + ${sig.fileName}}" onclick="previewSignature(this)">
                            <div class="signature-list-info">
                              <span th:text="${sig.fileName}" class="signature-list-name"></span>
                            </div>
                          </div>
                        </div>
                      </div>

                      <!-- Shared Signatures -->
                      <div class="signature-category" th:if="${not #lists.isEmpty(signatures.?[category == 'Shared'])}">
                        <h5 th:text="#{sign.sharedSigs}"></h5>
                        <div class="signature-list">
                          <div th:each="sig : ${signatures}" th:if="${sig.category == 'Shared'}" class="signature-list-item" th:data-src="@{'/api/v1/general/sign/' + ${sig.fileName}}" onclick="previewSignature(this)">
                            <div class="signature-list-info">
                              <span th:text="${sig.fileName}" class="signature-list-name"></span>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                  <div th:if="${#lists.isEmpty(signatures)}" class="text-center p-3">
                    <p th:text="#{sign.noSavedSigs}">No saved signatures found</p>
                  </div>
                </div>

                <div class="tab-container" th:title="#{sign.text}">
                  <label class="form-check-label" for="sigText" th:text="#{text}"></label>
                  <textarea class="form-control" id="sigText" name="sigText" rows="3"></textarea>
                  <label th:text="#{font}"></label>
                  <select class="form-control" name="font" id="font-select">
                    <option th:each="font : ${fonts}" th:value="${font.name}" th:text="${font.name}" th:class="${font.name.toLowerCase()+'-font'}"></option>
                  </select>
                  <div class="margin-auto-parent">
                    <button id="save-text-signature" class="btn btn-outline-success mt-2 margin-center" onclick="addDraggableFromText()" th:text="#{sign.add}"></button>
                  </div>
                  <script>
                    function addDraggableFromText() {
                      const sigText = document.getElementById('sigText').value;
                      const font = document.querySelector('select[name=font]').value;
                      const fontSize = 100;

                      const canvas = document.createElement('canvas');
                      const ctx = canvas.getContext('2d');
                      ctx.font = `${fontSize}px ${font}`;
                      const textWidth = ctx.measureText(sigText).width;
                      const textHeight = fontSize;

                      let paragraphs = sigText.split(/\r?\n/);

                      canvas.width = textWidth;
                      canvas.height = paragraphs.length * textHeight * 1.35; // for tails
                      ctx.font = `${fontSize}px ${font}`;

                      ctx.textBaseline = 'top';

                      let y = 0;

                      paragraphs.forEach(paragraph => {
                        ctx.fillText(paragraph, 0, y);
                        y += fontSize;
                      });

                      const dataURL = canvas.toDataURL();
                      DraggableUtils.createDraggableCanvasFromUrl(dataURL);
                    }
                  </script>
                </div>
              </div>

              <!-- draggables box -->
              <div id="box-drag-container" class="show-on-file-selected">
                <canvas id="pdf-canvas"></canvas>
                <script th:src="@{'/js/thirdParty/pdf-lib.min.js'}"></script>
                <script th:src="@{'/js/draggable-utils.js'}"></script>
                <div class="draggable-buttons-box ignore-rtl">
                  <button class="btn btn-outline-secondary" onclick="DraggableUtils.deleteDraggableCanvas(DraggableUtils.getLastInteracted())">
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-trash" viewBox="0 0 16 16">
                      <path d="M5.5 5.5A.5.5 0 0 1 6 6v6a.5.5 0 0 1-1 0V6a.5.5 0 0 1 .5-.5Zm2.5 0a.5.5 0 0 1 .5.5v6a.5.5 0 0 1-1 0V6a.5.5 0 0 1 .5-.5Zm3 .5a.5.5 0 0 0-1 0v6a.5.5 0 0 0 1 0V6Z" />
                      <path d="M14.5 3a1 1 0 0 1-1 1H13v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V4h-.5a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1H6a1 1 0 0 1 1-1h2a1 1 0 0 1 1 1h3.5a1 1 0 0 1 1 1v1ZM4.118 4 4 4.059V13a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1V4.059L11.882 4H4.118ZM2.5 3h11V2h-11v1Z" />
                    </svg>
                  </button>
                  <button class="btn btn-outline-secondary" onclick="document.documentElement.getAttribute('dir')==='rtl' ? DraggableUtils.incrementPage() : DraggableUtils.decrementPage()" style="margin-left:auto">
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-chevron-left" viewBox="0 0 16 16">
                      <path fill-rule="evenodd" d="M11.354 1.646a.5.5 0 0 1 0 .708L5.707 8l5.647 5.646a.5.5 0 0 1-.708.708l-6-6a.5.5 0 0 1 0-.708l6-6a.5.5 0 0 1 .708 0z" />
                    </svg>
                  </button>
                  <button class="btn btn-outline-secondary" onclick="document.documentElement.getAttribute('dir')==='rtl' ? DraggableUtils.decrementPage() : DraggableUtils.incrementPage()">
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-chevron-right" viewBox="0 0 16 16">
                      <path fill-rule="evenodd" d="M4.646 1.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 0 .708l-6 6a.5.5 0 0 1-.708-.708L10.293 8 4.646 2.354a.5.5 0 0 1 0-.708z" />
                    </svg>
                  </button>
                </div>
              </div>

              <!-- download button -->
              <div class="margin-auto-parent">
                <button id="download-pdf" class="btn btn-primary mb-2 show-on-file-selected margin-center" th:text="#{downloadPdf}"></button>
              </div>

              <script>
                document.getElementById("download-pdf").addEventListener('click', async () => {
                  const modifiedPdf = await DraggableUtils.getOverlayedPdfDocument();
                  const modifiedPdfBytes = await modifiedPdf.save();
                  const blob = new Blob([modifiedPdfBytes], { type: 'application/pdf' });
                  const link = document.createElement('a');
                  link.href = URL.createObjectURL(blob);
                  link.download = originalFileName + '_signed.pdf';
                  link.click();
                });
              </script>
            </div>
          </div>
        </div>
      </div>
      <th:block th:insert="~{fragments/footer.html :: footer}"></th:block>
    </div>
    <!-- Link the draggable.js file -->
    <script th:src="@{'/js/draggable.js'}"></script>
  </body>
</html>