package ie.dcu.apps.ist.actions;

import java.io.*;
import java.util.logging.*;

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

/**
 * Save segmentation context as.
 * 
 * @author Kevin McGuinness
 */
public class SaveAsAction extends AppAction {
	
	private FileDialog dialog;

	public SaveAsAction(ActionManager m) {
		super(m);
	}
	
	@Override
	public void run() {		
		if (window.hasContext()) {
			File file = getFile();
			if (file != null) {
				save(file);
			}
		}
	}
	
	
	private void createSaveDialog() {
		if (dialog == null) {
			dialog = new FileDialog(window.getShell(), SWT.SAVE | SWT.SHEET);
			dialog.setText(property("SaveAction.dialog.text"));
			dialog.setFilterExtensions(getFilters());
			dialog.setFilterNames(getFilterNames());
			
			String dir = getDirectory();
			if (dir != null) {
				dialog.setFilterPath(dir);
			}
		}
		
		dialog.setFileName(getFileName());
	}
	
	
	private String getDirectory() {
		File folder = window.getContext().getFolder();
		if (folder != null) {
			return folder.getAbsolutePath();
		}
		
		return null;
	}
	
	
	
	private String getFileName() {
		return window.getContext().getDefaultFilename();
	}
	
	
	private String[] getFilters() {
		return new String[] { property("SaveAction.dialog.filter.exts") };
	}
	
	
	private String[] getFilterNames() {
		return new String[] { property("SaveAction.dialog.filter.text") };
	}
	
	
	private File getFile() {
		createSaveDialog();
		
		String path = dialog.open();
		if (path != null) {
			return new File(path);
		}
		
		return null;
	}
	
	
	private void save(File file) {
		try {
			window.getContext().save(file);
			window.updateWindowTitle();
			status("Saved context %s successfully", file.getName());
		} catch (IOException e) {
			handleError(file, e);
		}
	}
	
	
	private void handleError(File file, IOException e) {
		
		// Log
		log(Level.SEVERE, "Error saving file", e);
		
		// Show error dialog
		error("Error saving segmentation context %s: %s", 
				file.getName(), e.getLocalizedMessage()
		);
		
		// Set status message
		status(Error, "Error saving segmentation context %s", file.getName());
	}
}