package ie.dcu.apps.ist.actions;

import ie.dcu.apps.ist.*;
import ie.dcu.apps.ist.views.SegmentationView;
import ie.dcu.apps.ist.views.SegmentationView.Tool;
import ie.dcu.segment.SegmentationContext;
import ie.dcu.swt.layout.LayoutFactory;

import java.io.*;

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;

/**
 * Open an image or segmentation context.
 * 
 * @author Kevin McGuinness
 */
public class OpenAction extends AppAction {

	private FileDialog dialog;
	
	/**
	 * The file extension given to a this object when it is saved on a disk
	 */
	public static final String IMGMAP_EXTENSION = ".zip";
	
	public OpenAction(ActionManager m) {
		super(m);
	}
	

	@Override
	public void run() {
		File file = getFile();
		if (file != null) {
			open(file);
		}
	}
	

	public boolean open(File file) {
		String name = file.getName();
		try {
			// clear the decks
			window.getView().resetView();

			if (SegmentationContext.isContextFile(file)) { // JP - minority case (opening an zip file to re-annotate)
				// Load context
				window.setContext(SegmentationContext.load(file));
				status("Opened segmentation context %s successfully", name);
			}
			else if (name.toLowerCase().endsWith(IMGMAP_EXTENSION))
			{
				// Load Imagemap from Disk
				window.setContext(SegmentationContext.loadImageMap(file));
				status("Opened segmentation context %s successfully", name);
			}			
			else { // JP - majority of cases (opening an img file to annotate)
				// Create context
				window.setContext(SegmentationContext.create(file));
				status("Opened image file %s successfully", name);
			}
			
			// Save history
			AppRecentFiles.getInstance().add(file);
			
			// Ok
			return true;
			
		} catch (IOException e) {
			
			handleError(file, e);
			status(Warning, "Problem opening file %s", name);
		
			return false;
		}
	}


	private void handleError(File file, IOException e) {

		// Get appropriate message
		String message = e.getCause() == null ? e.getLocalizedMessage() :
			e.getCause().getLocalizedMessage();
		
		// Log warning
		log.warning(String.format(
				"Unable to open %s\n Problem: %s", file, message
		));

		// Show warning dialog
		warning("Unable to open %s:\n%s", file.getName(), message);
	}


	private void createOpenDialog() {
		// Create dialog if necessary
		if (dialog == null) {
			dialog = new FileDialog(window.getShell(), SWT.OPEN | SWT.SHEET);
			dialog.setText(property("OpenAction.dialog.text"));
			dialog.setFilterExtensions(getFilters());
			dialog.setFilterNames(getFilterNames());
		}
	}
	
	private String[] getFilters() {
		return new String[] { property("OpenAction.dialog.filter.exts") };
	}
	
	private String[] getFilterNames() {
		return new String[] { property("OpenAction.dialog.filter.text") };
	}
	
	
	private File getFile() {
		createOpenDialog();
		
		String path = dialog.open();
		if (path != null) {
			return new File(path);
		}
		
		return null;
	}
}