package jcgp.gui;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Service;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
import jcgp.JCGP;
import jcgp.backend.resources.Resources;
import jcgp.gui.console.GUIConsole;
import jcgp.gui.dragresize.HorizontalDragResize;
import jcgp.gui.dragresize.VerticalDragResize;
import jcgp.gui.population.FunctionSelector;
import jcgp.gui.population.PopulationPane;
import jcgp.gui.settings.SettingsPane;

public class GUI extends Application {
	
	/* Colours */
	/** NEUTRAL_COLOUR is the colour elements should be when no interaction is occurring
	 * (no hovering, clicking, dragging or any other form of interaction). */
	public static final String NEUTRAL_COLOUR = "#FFFFFF";
	public static final String HARD_HIGHLIGHT_COLOUR = "#5496FF";
	public static final String MEDIUM_HIGHLIGHT_COLOUR = "#75BAFF";
	public static final String SOFT_HIGHLIGHT_COLOUR = "#C7DFFF";
	
	public static final String GOOD_SELECTION_COLOUR = "#38C25B";
	public static final String NEUTRAL_SELECTION_COLOUR = "#FFEF73";
	public static final String BAD_SELECTION_COLOUR = "#FF5C5C";
	
	/* Sizes and distances */
    public static final double RESIZE_MARGIN = 5.0;
    
    public static final double SETTINGS_WIDTH = 200;
    public static final double CONSOLE_HEIGHT = 100;
    
    public static final double WRAP_WIDTH = 90;
    
	public static final JCGP jcgp = new JCGP();
	public static final Resources resources = jcgp.getResources();
	
	public static final FunctionSelector functionSelector = new FunctionSelector(resources.getFunctionSet());
	
	private PopulationPane populationPane;
	
	private GUIConsole console = new GUIConsole();
	
	private SettingsPane settingsPane;
	
	private boolean evolving = false;
	
	private Object printLock = new Object();
	
	private Service<Void> cgpService = new Service<Void> () {
		@Override
		protected Task<Void> createTask() {
			Task<Void> t = new Task<Void>() {
				@Override
				protected Void call() throws Exception {
					while (!isCancelled() && !jcgp.isFinished()) {
						synchronized (printLock) {
							Platform.runLater(consoleFlush);
							jcgp.nextGeneration();
							printLock.wait();
						}
					}
					if (jcgp.isFinished()) {
						Platform.runLater(new Runnable() {
							@Override
							public void run() {
								runningMode(false);
							}
						});
					}
					return null;
				}
			};
			return t;
		}
	};
	
	private Runnable consoleFlush = new Runnable() {
		@Override
		public void run() {
			synchronized(printLock) {
				console.flush();
				printLock.notifyAll();
			}
		}
	};
	
	public static void main(String[] args) {
//		jcgp = new JCGP();
//		resources = jcgp.getResources();
//		
//		functionSelector = 
		
		launch();
	}
	
	@Override
	public void start(Stage primaryStage) throws Exception {
		jcgp.setConsole(console);
		
		/*
		 * Instantiate the various GUI elements here. 
		 * 
		 * 
		 */
		BorderPane leftFrame = new BorderPane();
		
		populationPane = new PopulationPane(jcgp);
		
		settingsPane = new SettingsPane(jcgp, this);
		
		HorizontalDragResize.makeDragResizable(settingsPane);
		VerticalDragResize.makeDragResizable(console);
		
		leftFrame.setCenter(populationPane);
		leftFrame.setBottom(console);
		
		BorderPane experimentLayer = new BorderPane();
		
		experimentLayer.setCenter(leftFrame);
		experimentLayer.setRight(settingsPane);
		
		primaryStage.setTitle("JCGP");
		
		Pane sceneParent = new Pane();
		experimentLayer.prefHeightProperty().bind(sceneParent.heightProperty());
		experimentLayer.prefWidthProperty().bind(sceneParent.widthProperty());
		sceneParent.getChildren().addAll(experimentLayer, functionSelector);
		
		primaryStage.setScene(new Scene(sceneParent));
		primaryStage.setMinWidth(800);
		primaryStage.setMinHeight(600);
		primaryStage.show();
	}

	public void runPause() {
		if (!jcgp.isFinished() && settingsPane.areParametersValid()) {
			if (!evolving) {
				runningMode(true);
				cgpService.restart();
			} else {
				cgpService.cancel();
				runningMode(false);
			}
		}
	}
	
	public void step() {
		if (!evolving && !jcgp.isFinished() && settingsPane.areParametersValid()) {
			if (settingsPane.isResetRequired()) {
				reset();
			}
			populationPane.unlockOutputs();
		
			jcgp.nextGeneration();
			console.flush();
			
			populationPane.updateGenes();
			populationPane.relockOutputs();
			
		}
	}
	
	public void reset() {
		if (!evolving && settingsPane.areParametersValid()) {
			settingsPane.applyParameters();
			jcgp.reset();
			populationPane.remakeTabs(jcgp.getPopulation(), jcgp.getResources());
			settingsPane.revalidateParameters();
			settingsPane.updateControls(false, jcgp.isFinished());
			console.flush();
		}
	}
	
	private void runningMode(boolean value) {
		populationPane.setDisable(value);
		settingsPane.updateControls(value, jcgp.isFinished());
				
		if (value) {
			populationPane.unlockOutputs();
			if (settingsPane.isResetRequired()) {
				reset();
			}
		} else {
			populationPane.updateGenes();
			populationPane.relockOutputs();
		}
		evolving = value;
	}
	
	public static void updateFunctionSelector() {
		functionSelector.remakeFunctions(resources.getFunctionSet());
	}
	
}