package jcgp.gui.console;

import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.control.TextArea;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import jcgp.gui.GUI;

public class GUIConsole extends AnchorPane implements Console {
	
	private boolean dragging;
	private TextArea textArea = new TextArea("Welcome to JCGP!\n");
	
	private StringBuffer printBuffer = new StringBuffer();
		
	public GUIConsole() {
		super();
		textArea.setEditable(false);
		textArea.setWrapText(true);

		setResizeListeners();
		
		AnchorPane.setTopAnchor(textArea, GUI.RESIZE_MARGIN);
		AnchorPane.setBottomAnchor(textArea, 0.0);
		AnchorPane.setRightAnchor(textArea, 0.0);
		AnchorPane.setLeftAnchor(textArea, 0.0);
		
		setMinHeight(GUI.CONSOLE_HEIGHT);
		setPrefHeight(GUI.CONSOLE_HEIGHT);
		
		getChildren().add(textArea);
		
	}

	/**
	 * 
	 */
	private void setResizeListeners() {
		setOnMousePressed(new EventHandler<MouseEvent>() {
			@Override
			public void handle(MouseEvent event) {
				// ignore clicks outside of the draggable margin
		        if(isInDraggableZone(event)) {
			        dragging = true;
		        }
			}
		});
		setOnMouseDragged(new EventHandler<MouseEvent>() {
			@Override
			public void handle(MouseEvent event) {
				if(dragging) {
					double newHeight = getHeight() - event.getY();
					if (newHeight >= getMinHeight()) {
						setPrefHeight(newHeight);
					} else {
						setPrefHeight(getMinHeight());
					}
				}
			}
		});
		setOnMouseMoved(new EventHandler<MouseEvent>() {
			@Override
			public void handle(MouseEvent event) {
				if(isInDraggableZone(event) || dragging) {
		            setCursor(Cursor.V_RESIZE);
		        }
		        else {
		            setCursor(Cursor.DEFAULT);
		        }
			}
		});
		setOnMouseReleased(new EventHandler<MouseEvent>() {
			@Override
			public void handle(MouseEvent event) {
				dragging = false;
		        setCursor(Cursor.DEFAULT);
			}
		});
		textArea.setOnMouseEntered(new EventHandler<MouseEvent>() {
			@Override
			public void handle(MouseEvent event) {
				setCursor(Cursor.DEFAULT);
			}
		});
	}
	
	private boolean isInDraggableZone(MouseEvent event) {
        return event.getY() < (GUI.RESIZE_MARGIN);
    }
	
	@Override
	public void println(String s) {
		printBuffer.append(s + "\n");
	}

	@Override
	public void print(String s) {
		printBuffer.append(s);
	}

	@Override
	public void flush() {
		textArea.appendText(printBuffer.toString());
		printBuffer = new StringBuffer();
	}
	
}