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

<head>
    <th:block th:insert="~{fragments/common :: head(title=#{sign.title})}"></th:block>
    <script src="js/signature_pad.umd.min.js"></script>
    <script src="js/interact.min.js"></script>

</head>
<style>
@font-face {
  font-family: 'Estonia';
  src: url(fonts/Estonia.woff2) format('woff2');
}
@font-face {
  font-family: 'Tangerine';
  src: url(fonts/Tangerine.woff2) format('woff2');
}
</style>
<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="#{sign.header}"></h2>

                        <!-- pdf selector -->
                        <div th:replace="~{fragments/common :: fileSelector(name='pdf-upload', multiple=false, accept='application/pdf')}"></div>
                        <script>
                        	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();
                                    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', multiple=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) {
                                        // code is from: https://github.com/szimek/signature_pad/issues/49#issuecomment-1104035775
                                        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() {
                                        // When zoomed out to less than 100%, for some very strange reason,
                                        // some browsers report devicePixelRatio as less than 1
                                        // and only part of the canvas is cleared then.
                                        var ratio =  Math.max(window.devicePixelRatio || 1, 1);

                                        // This part causes the canvas to be cleared
                                        signaturePadCanvas.width = signaturePadCanvas.offsetWidth * ratio;
                                        signaturePadCanvas.height = signaturePadCanvas.offsetHeight * ratio;
                                        signaturePadCanvas.getContext("2d").scale(ratio, ratio);

                                        // This library does not listen for canvas changes, so after the canvas is automatically
                                        // cleared by the browser, SignaturePad#isEmpty might still return false, even though the
                                        // canvas looks empty, because the internal data of this library wasn't cleared. To make sure
                                        // that the state of this library is consistent with visual state of the canvas, you
                                        // have to clear it manually.
                                        signaturePad.clear();
                                    }
                                    new IntersectionObserver((entries, observer) => {
                                        if (entries.some(entry => entry.intersectionRatio > 0)) {
                                            resizeCanvas();
                                        }
                                    }).observe(signaturePadCanvas);
                                    new ResizeObserver(resizeCanvas).observe(signaturePadCanvas);
                                </script>
                                <style>
                                    .drawing-pad-container {
                                        text-align: center;
                                    }

                                    #drawing-pad-canvas {
                                        background: rgba(125,125,125,0.2);
                                        width: 100%;
                                        height: 300px;
                                    }
                                </style>
                            </div>
                            <div class="tab-container" th:title="#{sign.text}">
                                <label class="form-check-label" for="sigText" th:text="#{text}"></label> 
                                <input type="text" class="form-control" id="sigText" name="sigText">
                                <label th:text="#{font}"></label> 
                                <select class="form-control" name="font" id="font-select">
                                    <option value="Estonia" class="estonia-font">Estonia</option>
                                    <option value="Tangerine" class="tangerine-font">Tangerine</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;

                                        canvas.width = textWidth;
                                        canvas.height = textHeight*1.35; //for tails
                                        ctx.font = `${fontSize}px ${font}`;
                                        ctx.fillText(sigText, 0, fontSize);

                                        const dataURL = canvas.toDataURL();
                                        DraggableUtils.createDraggableCanvasFromUrl(dataURL);
                                    }
                                </script>
                                <style>
                                    #font-select option {
                                        font-size: 30px;
                                    }
                                    #font-select option[value="Estonia"] {
                                        font-family: 'Estonia', sans-serif;
                                    }
                                    #font-select option[value="Tangerine"] {
                                        font-family: 'Tangerine', cursive;
                                    }
                                    #font-select option[value="Windsong"] {
                                        font-family: 'Windsong', cursive;
                                    }
                                </style>
                            </div>
                        </div>

                        <!-- draggables box -->
                        <div id="box-drag-container" class="show-on-file-selected">
                            <canvas id="pdf-canvas"></canvas>
                            <script 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('lang-direction')==='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('lang-direction')==='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>
                            <style>
                                #box-drag-container {
                                    position: relative;
                                    margin: 20px 0;
                                }
                                #pdf-canvas {
                                    box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.384);
                                    width: 100%;
                                }
                                .draggable-buttons-box {
                                    position: absolute;
                                    top: 0;
                                    padding: 10px;
                                    width: 100%;
                                    display: flex;
                                    gap: 5px;
                                }
                                .draggable-buttons-box > button {
                                    z-index: 10;
                                    background-color: rgba(13, 110, 253, 0.1);
                                }
                                .draggable-canvas {
                                    border: 1px solid red;
                                    position: absolute;
                                    touch-action: none;
                                    user-select: none;
                                    top: 0px;
                                    left: 0;
                                }
                            </style>
                        </div>

                        <!-- download button -->
                        <div class="margin-auto-parent">
                            <button id="download-pdf" class="btn btn-primary mb-2 show-on-file-selected margin-center">Download PDF</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>
        <div th:insert="~{fragments/footer.html :: footer}"></div>
    </div>
</body>
</html>