<!DOCTYPE html>
<html th:lang="${#locale.toString()}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">

<th:block th:insert="~{fragments/common :: head(title=#{crop.title})}"></th:block>


<body>
  <div id="page-container">
    <div id="content-wrap">
      <div th:insert="~{fragments/navbar.html :: navbar}"></div>
      <br> <br>
      <div class="container">
        <div class="row justify-content-center">
          <div class="col-md-6">
            <h2 th:text="#{crop.header}"></h2>
             <form id="cropForm" action="/crop" method="post" enctype="multipart/form-data">
              <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
              <input id="x" type="hidden" name="x">
              <input id="y" type="hidden" name="y">
              <input id="width" type="hidden" name="width">
              <input id="height" type="hidden" name="height">
              <button type="submit" class="btn btn-primary" th:text="#{crop.submit}"></button>
            </form>
            <div style="position: relative; display: inline-block;">
			    <canvas id="crop-pdf-canvas" style="position: absolute; top: 0; left: 0; z-index: 1;"></canvas>
			    <canvas id="overlayCanvas" style="position: absolute; top: 0; left: 0; z-index: 2;"></canvas>
			</div>

            <script>
            
            let pdfCanvas  = document.getElementById('crop-pdf-canvas');
            let overlayCanvas = document.getElementById('overlayCanvas');

            let context = pdfCanvas.getContext('2d');
            let overlayContext = overlayCanvas.getContext('2d');
            
            overlayCanvas.width = pdfCanvas.width;
            overlayCanvas.height = pdfCanvas.height;
            
            let isDrawing = false; // New flag to check if drawing is ongoing
            
            let cropForm = document.getElementById('cropForm');
            let fileInput = document.getElementById('fileInput-input');
            let xInput = document.getElementById('x');
            let yInput = document.getElementById('y');
            let widthInput = document.getElementById('width');
            let heightInput = document.getElementById('height');

            let pdfDoc = null;
            let currentPage = 1;
            let totalPages = 0;

            let startX = 0;
            let startY = 0;
            let rectWidth = 0;
            let rectHeight = 0;

            fileInput.addEventListener('change', function(e) {
              let file = e.target.files[0];
              if (file.type === 'application/pdf') {
                let reader = new FileReader();
                reader.onload = function(ev) {
                  let typedArray = new Uint8Array(reader.result);
                  pdfjsLib.GlobalWorkerOptions.workerSrc = 'pdfjs/pdf.worker.js'
                  pdfjsLib.getDocument(typedArray).promise.then(function(pdf) {
                    pdfDoc = pdf;
                    totalPages = pdf.numPages;
                    renderPage(currentPage);
                  });
                };
                reader.readAsArrayBuffer(file);
              }
            });

            overlayCanvas.addEventListener('mousedown', function(e) {
                // Clear previously drawn rectangle on the main canvas
                context.clearRect(0, 0, pdfCanvas.width, pdfCanvas.height);
                renderPage(currentPage); // Re-render the PDF

                // Clear the overlay canvas to ensure old drawings are removed
                overlayContext.clearRect(0, 0, overlayCanvas.width, overlayCanvas.height);

                startX = e.offsetX;
                startY = e.offsetY;
                isDrawing = true;
            });

            overlayCanvas.addEventListener('mousemove', function(e) {
                if (!isDrawing) return;
                overlayContext.clearRect(0, 0, overlayCanvas.width, overlayCanvas.height); // Clear previous rectangle
                
                rectWidth = e.offsetX - startX;
                rectHeight = e.offsetY - startY;
                overlayContext.strokeStyle = 'red';
                overlayContext.strokeRect(startX, startY, rectWidth, rectHeight);
            });

            overlayCanvas.addEventListener('mouseup', function(e) {
                isDrawing = false;
                
                rectWidth = e.offsetX - startX;
                rectHeight = e.offsetY - startY;

                let flippedY = pdfCanvas.height - e.offsetY;

                xInput.value = startX;
                yInput.value = flippedY;
                widthInput.value = rectWidth;
                heightInput.value = rectHeight;
                
                // Draw the final rectangle on the main canvas
                context.strokeStyle = 'red';
                context.strokeRect(startX, startY, rectWidth, rectHeight);
                
                overlayContext.clearRect(0, 0, overlayCanvas.width, overlayCanvas.height); // Clear the overlay
            });


            function renderPage(pageNumber) {
                pdfDoc.getPage(pageNumber).then(function(page) {
                    let viewport = page.getViewport({ scale: 1.0 });
                    pdfCanvas.width = viewport.width;
                    pdfCanvas.height = viewport.height;
                    
                    overlayCanvas.width = viewport.width;  // Match overlay canvas size with PDF canvas
                    overlayCanvas.height = viewport.height;
                    
                    let renderContext = { canvasContext: context, viewport: viewport };
                    page.render(renderContext);
                    pdfCanvas.classList.add("shadow-canvas");
                });
            }
           



            
            </script>
            
          </div>
        </div>
      </div>
    </div>
    <div th:insert="~{fragments/footer.html :: footer}"></div>
  </div>
</body>
</html>
