package org.argeo.cms.e4.maintenance;
   
   import java.io.File;
   import java.io.IOException;
   import java.nio.file.FileStore;
   import java.nio.file.Files;
   import java.nio.file.Path;
   import java.util.Collection;
   
  import org.apache.jackrabbit.core.RepositoryContext;
  import org.apache.jackrabbit.core.config.RepositoryConfig;
  import org.argeo.api.NodeConstants;
  import org.argeo.cms.ui.util.CmsUiUtils;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.layout.GridLayout;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Label;
  import org.osgi.framework.ServiceReference;
  
  class DataDeploymentUi extends AbstractOsgiComposite {
  	private static final long serialVersionUID = 590221539553514693L;
  
  	public DataDeploymentUi(Composite parent, int style) {
  		super(parent, style);
  	}
  
  	@Override
  	protected void initUi(int style) {
  		if (isDeployed()) {
  			initCurrentUi(this);
  		} else {
  			initNewUi(this);
  		}
  	}
  
  	private void initNewUi(Composite parent) {
  //		try {
  //			ConfigurationAdmin confAdmin = bc.getService(bc.getServiceReference(ConfigurationAdmin.class));
  //			Configuration[] confs = confAdmin.listConfigurations(
  //					"(" + ConfigurationAdmin.SERVICE_FACTORYPID + "=" + NodeConstants.NODE_REPOS_FACTORY_PID + ")");
  //			if (confs == null || confs.length == 0) {
  //				Group buttonGroup = new Group(parent, SWT.NONE);
  //				buttonGroup.setText("Repository Type");
  //				buttonGroup.setLayout(new GridLayout(2, true));
  //				buttonGroup.setLayoutData(new GridData(GridData.FILL_VERTICAL));
  //
  //				SelectionListener selectionListener = new SelectionAdapter() {
  //					private static final long serialVersionUID = 6247064348421088092L;
  //
  //					public void widgetSelected(SelectionEvent event) {
  //						Button radio = (Button) event.widget;
  //						if (!radio.getSelection())
  //							return;
  //						log.debug(event);
  //						JackrabbitType nodeType = (JackrabbitType) radio.getData();
  //						if (log.isDebugEnabled())
  //							log.debug(" selected = " + nodeType.name());
  //					};
  //				};
  //
  //				for (JackrabbitType nodeType : JackrabbitType.values()) {
  //					Button radio = new Button(buttonGroup, SWT.RADIO);
  //					radio.setText(nodeType.name());
  //					radio.setData(nodeType);
  //					if (nodeType.equals(JackrabbitType.localfs))
  //						radio.setSelection(true);
  //					radio.addSelectionListener(selectionListener);
  //				}
  //
  //			} else if (confs.length == 1) {
  //
  //			} else {
  //				throw new CmsException("Multiple repos not yet supported");
  //			}
  //		} catch (Exception e) {
  //			throw new CmsException("Cannot initialize UI", e);
  //		}
  
  	}
  
  	private void initCurrentUi(Composite parent) {
  		parent.setLayout(new GridLayout());
  		Collection<ServiceReference<RepositoryContext>> contexts = getServiceReferences(RepositoryContext.class,
  				"(" + NodeConstants.CN + "=*)");
  		StringBuffer text = new StringBuffer();
  		text.append("<span style='font-variant: small-caps;'>Jackrabbit Repositories</span><br/>");
  		for (ServiceReference<RepositoryContext> sr : contexts) {
  			RepositoryContext repositoryContext = bc.getService(sr);
  			String alias = sr.getProperty(NodeConstants.CN).toString();
  			String rootNodeId = repositoryContext.getRootNodeId().toString();
  			RepositoryConfig repositoryConfig = repositoryContext.getRepositoryConfig();
  			Path repoHomePath = new File(repositoryConfig.getHomeDir()).toPath().toAbsolutePath();
  			// TODO check data store
  
  			text.append("<b>" + alias + "</b><br/>");
  			text.append("rootNodeId: " + rootNodeId + "<br/>");
  			try {
  				FileStore fileStore = Files.getFileStore(repoHomePath);
 				text.append("partition: " + fileStore.toString() + "<br/>");
 				text.append(
 						percentUsed(fileStore) + " used (" + humanReadable(fileStore.getUsableSpace()) + " free)<br/>");
 			} catch (IOException e) {
 				log.error("Cannot check fileStore for " + repoHomePath, e);
 			}
 		}
 		Label label = new Label(parent, SWT.NONE);
 		label.setData(new GridData(SWT.FILL, SWT.FILL, false, false));
 		CmsUiUtils.markup(label);
 		label.setText("<span style=''>" + text.toString() + "</span>");
 	}
 
 	private String humanReadable(long bytes) {
 		long mb = bytes / (1024 * 1024);
 		return mb >= 2048 ? Long.toString(mb / 1024) + " GB" : Long.toString(mb) + " MB";
 	}
 
 	private String percentUsed(FileStore fs) throws IOException {
 		long used = fs.getTotalSpace() - fs.getUnallocatedSpace();
 		long percent = used * 100 / fs.getTotalSpace();
 		if (log.isTraceEnabled()) {
 			// output identical to `df -B 1`)
 			log.trace(fs.getTotalSpace() + "," + used + "," + fs.getUsableSpace());
 		}
 		String span;
 		if (percent < 80)
 			span = "<span style='color:green;font-weight:bold'>";
 		else if (percent < 95)
 			span = "<span style='color:orange;font-weight:bold'>";
 		else
 			span = "<span style='color:red;font-weight:bold'>";
 		return span + percent + "%</span>";
 	}
 
 	protected boolean isDeployed() {
 		return bc.getServiceReference(RepositoryContext.class) != null;
 	}
 
 }