Multimedia Galleries

@OneToMany(cascade=CascadeType.ALL) // Remember to delete files on disk on REMOVE
@JoinTable(name = "Product_productGallery")
private List<YadaGallerySlide> productGallery = new ArrayList<>();

<form th:action="@{/addEditSlide}" yada:updateOnSuccess=""
	th:object="${yadaGallerySlide}" th:fragment="galleryFormFragment"
	th:classappend="${#fields.hasErrors('*')}? has-error"
	enctype="multipart/form-data" class="yadaAjax" method="post" role="form">
	<div class="alert alert-danger" role="alert" th:if="${#fields.hasErrors('global')}" th:errors="*{global}">Some error</div>
	<fieldset>
		<input type="hidden" name="yadaGallerySlideId" th:value="${yadaGallerySlide.id}">
		<th:block th:if="${size==null}">
			<!--/* Adding a new slide: the size is from config */-->
			<div th:replace="/yada/form/fileUpload::field(fieldName='multipartImage', label='Add slide',accept='image/*',attachedFile=*{image},required=true,size=${slideImageSize})"></div>
		</th:block>
		<th:block th:if="${size!=null}">
			<!--/* Editing a slide: the size is from previous choice */-->
			<div th:replace="/yada/form/fileUpload::field(fieldName='multipartImage', label='Edit slide',accept='image/*',attachedFile=*{image},required=true,size=${size})"></div>
		</th:block>
		<button class="btn btn-success" type="submit" name="Save">[[*{id}!=null?'Save':'Add']] Slide</button>
	</fieldset>
</form>

@ModelAttribute("yadaGallerySlide")
public YadaGallerySlide addYadaGallerySlide(@RequestParam(value="yadaGallerySlideId", required=false) Long yadaGallerySlideId, Model model) {
	YadaGallerySlide toEdit = null;
	Exception exception = null;
	if (yadaGallerySlideId!=null) {
		try {
			toEdit = myDao.findYadaGallerySlide(yadaGallerySlideId);
		} catch (Exception e) {
			exception = e;
		}
		if (toEdit==null) {
			log.error("Can't find YadaGallerySlide with id={} - (creating new)", yadaGallerySlideId, exception);
		} else if (log.isDebugEnabled()) {
			log.debug("YadaGallerySlide {} fetched from DB as ModelAttribute", yadaGallerySlideId);
		}
	}
	if (toEdit==null) {
		toEdit = new YadaGallerySlide();
	}
	return toEdit;
}

@RequestMapping("/galleryCms")
public String galleryCms(Model model) {
	YadaIntDimension[] slideDimensions = config.getDimensionsMyGallery();
	model.addAttribute("slideImageSize", YadaIntDimension.biggestCover(slideDimensions));
	return "/my/galleryCms";
}

@RequestMapping("/addEditSlide") // Ajax
public String addEditSlide(YadaGallerySlide yadaGallerySlide, BindingResult yadaGallerySlideBinding, Product product, HttpServletRequest request, Model model, Locale locale) {
	if (YadaCommonsMultipartResolver.limitExceeded(request)) {
		// All Request Parameters sent with the form are lost so we can't return the submitted form
		yadaNotify.title("Slide not saved", model).error().message("Request too big. Total file size limit is " + config.getMaxFileUploadSizeBytes()/(1024*1024) + " MB").add();
		return YadaViews.AJAX_NOTIFY; // The yada version with icons, not the artemide one
	}
	boolean isAdd = yadaGallerySlide.getId()==null;
	String uploadFolder = "/images/product";
	//
	// Validate image size and upload image file, if any
	//
	YadaIntDimension[] slideDimensions = config.getDimensionsCatalogHero();
	YadaManagedFile slideManagedFile = validateAndUploadSlideImage(yadaGallerySlide, yadaGallerySlideBinding, slideDimensions);
	if (!yadaGallerySlideBinding.hasErrors()) {
		try {
			if (isAdd) {
				// Add new slide to gallery
				productDao.addProductSlide(yadaGallerySlide, product);
			} else {
				// Update existing slide
				// yadaGallerySlide = (YadaGallerySlide) yadaDao.save(yadaGallerySlide);
				yadaGallerySlide = productDao.saveGallerySlideWithImage(yadaGallerySlide);
			}

			//
			// Upload and crop image if any
			//
			if (slideManagedFile!=null) {
				YadaAttachedFile previousImage = yadaGallerySlide.getImage();
				if (previousImage!=null) {
					yadaFileManager.deleteFileAttachment(previousImage);
				}
				String cropRedirect = yadaWebUtil.redirectString("/myCms/cropPage", locale);
				String finalRedirect = yadaWebUtil.redirectString("/galleryCms", locale);
				YadaCropQueue yadaCropQueue = amdSession.addCropQueue(cropRedirect, finalRedirect); // Clear any previous abandoned crops and set the destination
				YadaCropImage yadaCropImage = yadaCropQueue.addCropImage(slideManagedFile, slideDimensions, uploadFolder, "product_");
				YadaAttachedFile newOrExisting  = yadaCropImage.titleKey("crop.gallery.product").cropDesktop().linkAdd();
				yadaGallerySlide = productDao.addGallerySlideImage(yadaGallerySlide, newOrExisting, yadaCropImage);
				log.debug("Entering crop workflow for product hero");
				return yadaCropQueue.getCropRedirect();
			}
			amdSession.deleteCropQueue();
		} catch (Exception e) {
			log.error("Failed to upload slide", e);
			yadaFileManager.delete(slideManagedFile);
			yadaGallerySlideBinding.reject("error.gallery.systemerror");
		}
	} else {
		// Has errors
		yadaFileManager.delete(slideManagedFile);
	}

	// Fill form Model attributes to show the form again
	if (isAdd) {
		if (!yadaGallerySlideBinding.hasErrors()) {
			// When adding successfully, need to clear the slide or the add form will be wrong
			model.addAttribute("yadaGallerySlide", new YadaGallerySlide());
		}
		return "/galleryCms::galleryFormFragment";
	}
	return "/galleryCms::galleryFormFragment";
}

private YadaManagedFile validateAndUploadSlideImage(YadaGallerySlide yadaGallerySlide, BindingResult yadaGallerySlideBinding, YadaIntDimension[] slideDimensions) {
	YadaManagedFile slideManagedFile = null;
	MultipartFile image = yadaGallerySlide.getMultipartImage();
	if (image!=null && !image.isEmpty()) {
		try {
			YadaIntDimension biggestNeeded = YadaIntDimension.biggestCover(slideDimensions);
			// Image upload
			slideManagedFile = yadaFileManager.manageFile(image);
			// Validation
			YadaIntDimension fileDimension = slideManagedFile.getDimension();
			if (fileDimension.isUnset()) {
				yadaGallerySlideBinding.rejectValue("multipartImage", "validation.value.invalidImage", "Invalid image file");
			} else if (biggestNeeded.isAnyBiggerThan(fileDimension)) {
				yadaGallerySlideBinding.rejectValue("multipartImage", "validation.value.smallImage", new Object[] {fileDimension, biggestNeeded}, "Image too small");
			}
		} catch (IOException e) {
			log.error("Error uploading image", e);
			yadaGallerySlideBinding.rejectValue("multipartImage", "dashboard.imageupload.error");
		}
	}
	return slideManagedFile;
}