package jcgp.gui.population;

import javafx.geometry.VPos;
import javafx.scene.Group;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Circle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextAlignment;
import jcgp.gui.constants.Constants;

/**
 * Defines the general behaviour of the visual representation of each chromosome gene.
 * <br><br>
 * In practice, this is subclass of {@code javafx.scene.Group} containing a {@code Circle}
 * object and a {@code Text} object. Subclasses may add further elements to the group, for
 * instance to display connection input and output sockets. 
 * 
 * @author Eduardo Pedroni
 *
 */
public abstract class GUIGene extends Group {

	public enum GUIGeneState {
		NEUTRAL,
		HOVER,
		EXTENDED_HOVER,
		ACTIVE_HOVER
	}

	private GUIGeneState currentState = GUIGeneState.NEUTRAL;

	private Text text = new Text();
	private Circle mainCircle = new Circle(Constants.NODE_RADIUS, Paint.valueOf(Constants.NEUTRAL_COLOUR));

	/**
	 * Initialises the {@code Text} and {@code Circle} objects so that all genes are standardised.
	 */
	protected GUIGene() {
		text.setFont(Font.font("Arial", 12));
		text.setTextOrigin(VPos.CENTER);
		text.setTextAlignment(TextAlignment.CENTER);
		text.setWrappingWidth(Constants.NODE_RADIUS * 2);
		text.setX(-Constants.NODE_RADIUS);
		text.setVisible(true);

		mainCircle.setStroke(Paint.valueOf("black"));
		
		getChildren().addAll(mainCircle, text);
		
	}

	/**
	 * Sets the gene's text field.
	 * 
	 * @param newText the text string to be displayed.
	 */
	public void setText(String newText) {
		text.setText(newText);
	}

	public GUIGeneState getState() {
		return currentState;
	}

	public void setState(GUIGeneState newState) {
		switch (newState) {
		case NEUTRAL:
			mainCircle.setFill(Paint.valueOf(Constants.NEUTRAL_COLOUR));
			setLinesVisible(false);
			break;
		case HOVER:
			mainCircle.setFill(Paint.valueOf(Constants.MEDIUM_HIGHLIGHT_COLOUR));
			setLinesVisible(true);
			break;
		case EXTENDED_HOVER:
			mainCircle.setFill(Paint.valueOf(Constants.SOFT_HIGHLIGHT_COLOUR));
			setLinesVisible(false);
			break;
		case ACTIVE_HOVER:
			mainCircle.setFill(Paint.valueOf(Constants.SOFT_HIGHLIGHT_COLOUR));
			setLinesVisible(true);
			break;
			
		default:
			break;
		}
		currentState = newState;
	}
	
	protected abstract void setLinesVisible(boolean value);
}