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import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class FruitsAndStuff extends Application {

	// Defines the rootnode as a field, which enables the lookup(String)-method from anywhere in the class
	private BorderPane componentLayout = new BorderPane();
	
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) {
    	
		primaryStage.setTitle("Example GUI");
    	
		// Padding defines how close this nodes' borders can be another ones'
		// Insets' parameters defines the distace for top,right,bottom,left
    	componentLayout.setPadding(new Insets(20,20,20,20));

		// Sets the different areas in the borderpane
    	componentLayout.setTop(createTop());
    	componentLayout.setCenter(createCenter());
    	componentLayout.setBottom(createBottom());
    	
		// Adds the root of the scene graph to the scene, and sets the scene to the stage
    	Scene appScene = new Scene(componentLayout,500,500);
    	primaryStage.setScene(appScene);
    	primaryStage.show();
    }
    
    private Node createCenter() {
    	
    	final FlowPane listPane = new FlowPane();

		// Sets id to make the flowpane reachable
    	listPane.setId("list_pane_center");
		
		// Defines the distance between components in the flowpane
    	listPane.setHgap(100);
    	
    	Label listLbl = new Label("Vegetables");

    	ListView<String> vegetables = new ListView<String>(FXCollections.observableArrayList("Asparagus", "Beans", "Broccoli", "Cabbage"
   	         , "Carrot", "Celery", "Cucumber", "Leek", "Mushroom"
   	         , "Pepper", "Radish", "Shallot", "Spinach", "Swede"
   	         , "Turnip"));
    	
		vegetables.setMaxHeight(300);
 
		// Sets id to make the listview reachable
    	vegetables.setId("vegetables_center");
    	
    	listPane.getChildren().addAll(listLbl,vegetables);
    	listPane.setVisible(false);
    	
    	return listPane;
    }
    
    private Node createTop() {
    	
		final FlowPane choicePane = new FlowPane();

		// Sets id to make the flowpane reachable
    	choicePane.setId("choice_pane_top");
    	choicePane.setHgap(100);
    	
		Label choiceLbl = new Label("Fruits");
    	
		ChoiceBox<String> fruits = new ChoiceBox<String>(FXCollections.observableArrayList("Apple", "Apricot", "Banana"
    	         ,"Cherry", "Date", "Kiwi", "Orange", "Pear", "Strawberry"));
    	
    	fruits.setId("fruits_top");
    	
    	choicePane.getChildren().addAll(choiceLbl,fruits);
    	
    	return choicePane;
    }
    
    private Node createBottom() {
    	
    	StackPane sp = new StackPane();
    	sp.setPadding(new Insets(10, 10, 10, 10));
 
		// setStyle is given a CSS-text to set background color
    	sp.setStyle("-fx-background-color: #336699;");
    	
		Button vegFruitBut = new Button("Fruit or Veg");


    	vegFruitBut.setOnAction(new EventHandler<ActionEvent>() {
    		
			// Implements the handle "inline" with a anonymous inner class
    		@Override
    		public void handle(ActionEvent event) {
 
				// Uses the root to the scene graph, and retrives the references through the object id. Lookup is given CSS-text.
    			Node choicePane = componentLayout.lookup("#choice_pane_top");
    			Node listPane = componentLayout.lookup("#list_pane_center");
    			
    			choicePane.setVisible(!choicePane.isVisible());
    			listPane.setVisible(!listPane.isVisible());
    		}
    	});
    	
    	Button regBut = new Button("Register");    
    	
		regBut.setOnAction(new EventHandler<ActionEvent>() {
			@Override
			public void handle(ActionEvent arg0) {
				Node choicePane = componentLayout.lookup("#choice_pane_top");
				
				if (choicePane.isVisible()) {
					ChoiceBox<String> fruits = (ChoiceBox<String>)componentLayout.lookup("#fruits_top");
					
					// Retrives and prints the selected fruit
					System.out.println(fruits.getSelectionModel().getSelectedItem());
				}
				else {
					ListView<String> vegetables = (ListView<String>) componentLayout.lookup("#vegetables_center");
					System.out.println(vegetables.getSelectionModel().getSelectedItem());
				}	
			}
		});
    	
    	sp.getChildren().addAll(vegFruitBut,regBut);
    	
		// Aligns the buttons in the stackpane
    	StackPane.setAlignment(vegFruitBut,Pos.CENTER_LEFT);
    	StackPane.setAlignment(regBut, Pos.CENTER_RIGHT);
    	
    	return sp;    	
    }
}