package ie.dcu.apps.ist;

import static ie.dcu.segment.annotate.AnnotationType.*;
import static ie.dcu.apps.ist.AppPrefs.Keys.*;
import static ie.dcu.apps.ist.AppPrefs.SupportedTypes.*;
import ie.dcu.segment.annotate.*;
import ie.dcu.apps.ist.AppPrefs.*;

import java.util.prefs.*;

import org.eclipse.jface.resource.*;
import org.eclipse.swt.graphics.*;

/**
 * Manages updating various components when preferences change.
 * 
 * @author Kevin McGuinness
 */
class AppPrefsManager implements PreferenceChangeListener {
	
	private final AppWindow window;
	private final ColorRegistry colorRegistry;
	private final AppPrefs prefs;
	

	public AppPrefsManager(AppWindow window) {
		this.window = window;
		this.colorRegistry = JFaceResources.getColorRegistry();
		this.prefs = loadPreferences();
	}
	
	
	private AppPrefs loadPreferences() {
		AppPrefs prefs = new AppPrefs();
		prefs.addPreferenceChangeListener(this);
		return prefs;
	}
	
	
	public AppPrefs getPrefs() {
		return prefs;
	}
	
	
	public void update() {
		updateFeedbackEnabled();
		updateBackgroundColor();
		updateForegroundColor();
		updateExperimentEmbedded();
	}
	
	
	public void updateExperimentEmbedded() {
		boolean on = prefs.get(BOOLEAN, Keys.EXPERIMENT_EMBEDDED, false);
		window.setExperimentModeEmbedded(on);
	}
	
	
	public void updateFeedbackEnabled() {
		boolean on = prefs.get(BOOLEAN, Keys.ENABLE_FEEDBACK, true);
		window.setEnableFeedback(on);
	}
	
	
	public void updateForegroundColor() {
		RGB color = prefs.get(RGB, Keys.FOREGROUND_COLOR, DEFAULT_FOREGROUND);
		colorRegistry.put(AnnotationType.Foreground.key, color);
		window.getView().repaint();
	}
	
	
	public void updateBackgroundColor() {
		RGB color = prefs.get(RGB, Keys.BACKGROUND_COLOR, DEFAULT_BACKGROUND);
		colorRegistry.put(AnnotationType.Background.key, color);
		window.getView().repaint();
	}
	

	public void preferenceChange(PreferenceChangeEvent evt) {
		String pref = evt.getKey();
		
		if (pref.equals(ENABLE_FEEDBACK)) {
			updateFeedbackEnabled();
		
		} else if (pref.equals(FOREGROUND_COLOR)) {
			updateForegroundColor();
		
		} else if (pref.equals(BACKGROUND_COLOR)) {
			updateBackgroundColor();
			
		} else if (pref.equals(EXPERIMENT_EMBEDDED)) {
			updateExperimentEmbedded();
		}

	}

}