/**
 * 
 */
package ie.dcu.apps.ist.actions;

import ie.dcu.apps.ist.exp.*;

import java.io.*;

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

/**
 * Open an experiment file and switch to experiment mode.
 * 
 * @author Kevin McGuinness
 */
public class OpenExperimentAction extends AppAction {
	
	private FileDialog dialog;
	

	public OpenExperimentAction(ActionManager m) {
		super(m);
	}

	
	@Override
	public void run() {
		File file = getFile();
		if (file != null) {
			open(file);
		}
	}
	
	
	private void open(File file) {
		try {
			Experiment ex = ExperimentFactory.getInstance().load(file);
			window.setExperiment(ex);
			
		} catch (IOException ex) {
			handleError(file, ex);
		} catch (FormatException ex) {
			handleError(file, ex);
		}
	}
	
	
	private void handleError(File file, Exception ex) {
		// Get appropriate message
		String mesg = ex.getMessage();
		
		// Log warning
		log.warning(String.format(
				"Unable to open experiment file %s\n Problem: %s", file, mesg
		));

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


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