package com.bham.pij.assignments.edgedetector;

import java.io.File;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

public class UserInterface extends Application {

	private VBox root = new VBox();
	private ImageView chosenImage = new ImageView();
	private Image toBeFiltered;
	ImageView toBeShown;

	@Override

	public void start(Stage stage) throws Exception {

		stage.setTitle("Edge Detector");

		Menu fileMenu = new Menu("File");
		MenuItem openItem = new MenuItem("Open");
		MenuItem closeItem = new MenuItem("Close");

		Menu toolsMenu = new Menu("Tools");
		MenuItem edgeDetectionItem = new MenuItem("Edge Detection");
		MenuItem revertItem = new MenuItem("Revert");

		closeItem.setDisable(true);
		edgeDetectionItem.setDisable(true);
		revertItem.setDisable(true);

		openItem.setOnAction(new EventHandler<ActionEvent>() {

			@Override

			public void handle(ActionEvent t) {

				FileChooser fileChooser = new FileChooser();
				fileChooser.setTitle("Open Image File");
				File file = fileChooser.showOpenDialog(stage);

				if(file != null) {

					loadImageFile(file);

					closeItem.setDisable(false);
					openItem.setDisable(true);
					edgeDetectionItem.setDisable(false);
				}
			}
		});

		closeItem.setOnAction(new EventHandler<ActionEvent>() {

				@Override

				public void handle(ActionEvent t) {

					root.getChildren().remove(1);

					closeItem.setDisable(true);
					openItem.setDisable(false);
					revertItem.setDisable(true);
					edgeDetectionItem.setDisable(true);
				}
		});


		edgeDetectionItem.setOnAction(new EventHandler<ActionEvent>() {

			@Override

			public void handle(ActionEvent t) {

				EdgeDetector edge = new EdgeDetector();
				Image filteredImage = edge.filterImage(toBeFiltered);
				toBeShown = new ImageView(filteredImage);

				root.getChildren().remove(chosenImage);
				root.getChildren().add(toBeShown);

				edgeDetectionItem.setDisable(true);
				revertItem.setDisable(false);
			}
		});

		revertItem.setOnAction(new EventHandler<ActionEvent>() {

			@Override

			public void handle(ActionEvent t) {

				root.getChildren().remove(toBeShown);
				root.getChildren().add(chosenImage);

				revertItem.setDisable(true);
				edgeDetectionItem.setDisable(false);
			}
		});


		toolsMenu.getItems().addAll(edgeDetectionItem, revertItem);

		fileMenu.getItems().addAll(openItem, closeItem);
		MenuBar menuBar = new MenuBar();
		menuBar.getMenus().addAll(fileMenu, toolsMenu);

		root.getChildren().addAll(menuBar);
		stage.setScene(new Scene(root, 500, 500));
		stage.show();

	}

	private void loadImageFile(File file) {

		Image image = new Image("file:" + file.getPath());
		ImageView imgView = new ImageView(image);

		root.getChildren().add(imgView);

		chosenImage = imgView;
		toBeFiltered = image;
	}


	public static void main(String[] args) {

		launch(args);
	}
}