Synnefo

import gr.grnet.pithos.web.client.rest.DeleteCommand;

import gr.grnet.pithos.web.client.rest.GetCommand;

import gr.grnet.pithos.web.client.rest.PostCommand;

import gr.grnet.pithos.web.client.rest.RestCommand;

import gr.grnet.pithos.web.client.rest.RestException;

import gr.grnet.pithos.web.client.rest.resource.FileResource;

import gr.grnet.pithos.web.client.rest.resource.UserResource;

import gr.grnet.pithos.web.client.rest.resource.UserSearchResource;

import com.google.gwt.core.client.GWT;

import com.google.gwt.http.client.URL;

import com.google.gwt.user.client.DeferredCommand;

    private Pithos app;

	int selectedRow = -1;

	int permissionCount = -1;

	List<FileResource> versions = null;

	final Images images;

	final VerticalPanel permPanel = new VerticalPanel();

	final FlexTable permTable = new FlexTable();

	FileResource toRemove = null;

	FilePropertiesDialog container;

	public VersionsList(Pithos _app, FilePropertiesDialog aContainer, final Images theImages, List<FileResource> theVersions) {

        app = _app;

		images = theImages;

		container = aContainer;

		versions = theVersions;

		Collections.sort(theVersions, new Comparator<FileResource>(){

			@Override

			public int compare(FileResource o1, FileResource o2) {

				return o1.getVersion().compareTo(o2.getVersion());

			}

		});

		permTable.setText(0, 0, "Version");

		permTable.setText(0, 1, "Created");

		permTable.setText(0, 2, "Modified");

		permTable.setText(0, 3, "Size");

		permTable.setText(0, 4, "");

		permTable.setText(0, 5, "");

		permTable.getFlexCellFormatter().setStyleName(0, 0, "props-toplabels");

		permTable.getFlexCellFormatter().setStyleName(0, 1, "props-toplabels");

		permTable.getFlexCellFormatter().setStyleName(0, 2, "props-toplabels");

		permTable.getFlexCellFormatter().setStyleName(0, 3, "props-toplabels");

		permTable.getFlexCellFormatter().setColSpan(0, 1, 2);

		permTable.getFlexCellFormatter().setHorizontalAlignment(0, 0, HasHorizontalAlignment.ALIGN_CENTER);

		permTable.getFlexCellFormatter().setHorizontalAlignment(0, 1, HasHorizontalAlignment.ALIGN_CENTER);

		permTable.getFlexCellFormatter().setHorizontalAlignment(0, 2, HasHorizontalAlignment.ALIGN_CENTER);

		permTable.getFlexCellFormatter().setHorizontalAlignment(0, 3, HasHorizontalAlignment.ALIGN_CENTER);

		permPanel.add(permTable);

		permPanel.addStyleName("pithos-TabPanelBottom");

		permTable.addStyleName("pithos-permList");

		initWidget(permPanel);

		updateTable();

	}

	public void updateTable() {

		copyListAndContinue(versions);		

	}

	public void showVersionsTable(){

		int i = 1;

		if (toRemove != null) {

			versions.remove(toRemove);

			toRemove = null;

		}

		for (final FileResource dto : versions) {

			HTML restoreVersion = new HTML("<a href='#' class='hidden-link info'><span>"+AbstractImagePrototype.create(images.restore()).getHTML()+"</span><div>Restore this Version</div></a>");

			restoreVersion.addClickHandler(new ClickHandler() {

				@Override

				public void onClick(ClickEvent event) {

					restoreVersion(dto);

				}

			});

			permTable.setHTML(i, 0, "<span>" + dto.getVersion() + "</span>");

			permTable.setHTML(i, 1, "<span>" + formatDate(dto.getCreationDate()) + " by " + app.findUserFullName(dto.getCreatedBy()) + "</span>");

			permTable.setHTML(i, 2, "<span>" + formatDate(dto.getModificationDate()) + " by " + app.findUserFullName(dto.getModifiedBy()) + "</span>");

			permTable.setHTML(i, 3, "<span>" + dto.getFileSizeAsString() + "</span>");

			HTML downloadHtml = new HTML("<a class='hidden-link info' href='#'><span>"+AbstractImagePrototype.create(images.download()).getHTML()+"</span><div>View this Version</div></a>");

			downloadHtml.addClickHandler(new ClickHandler() {

				@Override

				public void onClick(ClickEvent event) {

					String dateString = RestCommand.getDate();

					String resource = dto.getUri().substring(app.getApiPath().length()-1, dto.getUri().length());

					String sig = app.getCurrentUserResource().getUsername()+" "+RestCommand.calculateSig("GET", dateString, resource, RestCommand.base64decode(app.getToken()));

					String fileUrl = dto.getUri() + "?version=" + dto.getVersion() + "&Authorization=" + URL.encodeComponent(sig) + "&Date="+URL.encodeComponent(dateString);

					Window.open(fileUrl, "_BLANK", "");

				}

			});

			permTable.setWidget(i, 4, downloadHtml);

			permTable.setWidget(i, 5, restoreVersion);

			permTable.getFlexCellFormatter().setStyleName(i, 0, "props-labels");

			permTable.getFlexCellFormatter().setHorizontalAlignment(i, 0, HasHorizontalAlignment.ALIGN_CENTER);

			permTable.getFlexCellFormatter().setHorizontalAlignment(i, 1, HasHorizontalAlignment.ALIGN_CENTER);

			permTable.getFlexCellFormatter().setColSpan(i, 1, 2);

			permTable.getFlexCellFormatter().setHorizontalAlignment(i, 2, HasHorizontalAlignment.ALIGN_CENTER);

			permTable.getFlexCellFormatter().setHorizontalAlignment(i, 3, HasHorizontalAlignment.ALIGN_CENTER);

			i++;

		}

		for (; i < permTable.getRowCount(); i++)

			permTable.removeRow(i);

	}

	void removeVersion(final FileResource version) {

		DeleteCommand df = new DeleteCommand(app, version.getUri()){

			@Override

			public void onComplete() {

				toRemove = version;

				updateTable();

				app.getTreeView().refreshCurrentNode(false);

			}

			@Override

			public void onError(Throwable t) {

				GWT.log("", t);

				if(t instanceof RestException){

					int statusCode = ((RestException)t).getHttpStatusCode();

					if(statusCode == 405)

						app.displayError("You don't have the necessary permissions");

					else if(statusCode == 404)

						app.displayError("Versions does not exist");

					else

						app.displayError("Unable to remove version:"+((RestException)t).getHttpStatusText());

				}

				else

					app.displayError("System error removing version:"+t.getMessage());

			}

		};

		DeferredCommand.addCommand(df);

	}

	void restoreVersion(final FileResource version) {

		FileResource selectedFile = (FileResource) app.getCurrentSelection();

		PostCommand ep = new PostCommand(app, selectedFile.getUri()+"?restoreVersion="+version.getVersion(),"",200){

			@Override

			public void onComplete() {

				container.hide();

                app.getTreeView().refreshCurrentNode(false);

			}

			@Override

			public void onError(Throwable t) {

				GWT.log("", t);

				if(t instanceof RestException)

					app.displayError("Unable to restore version:"+((RestException)t).getHttpStatusText());

				else

					app.displayError("System error restoring version:"+t.getMessage());

			}

		};

		DeferredCommand.addCommand(ep);

	}

	private String formatDate(Date date){

		DateTimeFormat format = DateTimeFormat.getFormat("dd/MM/yyyy : HH:mm");

		return format.format(date);

	}

	/**

	 * Copies the input List to a new List

	 * @param input

	 */

	private void copyListAndContinue(List<FileResource> input){

		List<FileResource> copiedInput = new ArrayList<FileResource>();		

		for(FileResource dto : input) {

			copiedInput.add(dto);

		}

		handleFullNames(copiedInput);

	}

	/**

	 * Examines whether or not the user's full name exists in the 

	 * userFullNameMap in the Pithos.java for every element of the input list.

	 * If the user's full name does not exist in the map then a request is being made

	 * for the specific username.  

	 * 

	 * @param input

	 */

	private void handleFullNames(List<FileResource> input){		

		if(input.isEmpty()){

			showVersionsTable();

			return;

		}

		if(app.findUserFullName(input.get(0).getOwner()) == null){

			findFullNameAndUpdate(input);		

			return;

		}

		if(input.size() >= 1){

			input.remove(input.get(0));

			if(input.isEmpty()){

				showVersionsTable();			

			}else{

				handleFullNames(input);

			}

		}					

	}

	/**

	 * Makes a request to search for full name from a given username

	 * and continues checking the next element of the List.

	 *  

	 * @param input

	 */

	private void findFullNameAndUpdate(final List<FileResource> input){				

		final String aUserName = input.get(0).getOwner();

		String path = app.getApiPath() + "users/" + aUserName;

		GetCommand<UserSearchResource> gg = new GetCommand<UserSearchResource>(app, UserSearchResource.class, path, false,null) {

			@Override

			public void onComplete() {

				final UserSearchResource result = getResult();

				for (UserResource user : result.getUsers()){

					String username = user.getUsername();

					String userFullName = user.getName();

					app.putUserToMap(username, userFullName);

					if(input.size() >= 1){

						input.remove(input.get(0));						

						if(input.isEmpty()){

							showVersionsTable();

							return;

						}

						handleFullNames(input);										

					}									

				}

			}

			@Override

			public void onError(Throwable t) {				

				app.displayError("Unable to fetch user's full name from the given username " + aUserName);

				if(input.size() >= 1){

					input.remove(input.get(0));

					handleFullNames(input);					

				}

			}

		};

		DeferredCommand.addCommand(gg);

	}