<!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=#{rotate.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="#{rotate.header}"></h2>

                        <form action="#" th:action="@{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 class="previewContainer">
                                    <img id="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>
        <div th:insert="~{fragments/footer.html :: footer}"></div>
    </div>

    <script>
		const angleInput = document.getElementById("angleInput");
		const fileInput = document.getElementById("fileInput-input");
		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;
			preview.src = canvas.toDataURL();
		});

		function rotate(deg) {
			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>
    <style>
#pdf-preview {
	margin: 0 auto;
	display: block;
	max-width: calc(100% - 30px);
	max-height: calc(100% - 30px);
	box-shadow: 0 0 4px rgba(100, 100, 100, .25);
	transition: rotate .3s;
	position: absolute;
	top: 50%;
	left: 50%;
	translate: -50% -50%;
}

.previewContainer {
	aspect-ratio: 1;
	width: 100%;
	border: 1px solid rgba(0, 0, 0, .125);
	border-radius: 0.25rem;
	margin: 1rem 0;
	padding: 15px;
	display: block;
	overflow: hidden;
	position: relative;
}

.buttonContainer {
	display: flex;
	justify-content: space-around;
}
</style>
</body>

</html>