Add a basic GUI to Wessy

Use JavaFX technology to implement the GUI.

build.gradle

@@ -11,7 +11,20 @@ repositories {
 dependencies {
     testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.5.0'
     testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.5.0'
-
+    String javaFxVersion = '11'
+
+    implementation group: 'org.openjfx', name: 'javafx-base', version: javaFxVersion, classifier: 'win'
+    implementation group: 'org.openjfx', name: 'javafx-base', version: javaFxVersion, classifier: 'mac'
+    implementation group: 'org.openjfx', name: 'javafx-base', version: javaFxVersion, classifier: 'linux'
+    implementation group: 'org.openjfx', name: 'javafx-controls', version: javaFxVersion, classifier: 'win'
+    implementation group: 'org.openjfx', name: 'javafx-controls', version: javaFxVersion, classifier: 'mac'
+    implementation group: 'org.openjfx', name: 'javafx-controls', version: javaFxVersion, classifier: 'linux'
+    implementation group: 'org.openjfx', name: 'javafx-fxml', version: javaFxVersion, classifier: 'win'
+    implementation group: 'org.openjfx', name: 'javafx-fxml', version: javaFxVersion, classifier: 'mac'
+    implementation group: 'org.openjfx', name: 'javafx-fxml', version: javaFxVersion, classifier: 'linux'
+    implementation group: 'org.openjfx', name: 'javafx-graphics', version: javaFxVersion, classifier: 'win'
+    implementation group: 'org.openjfx', name: 'javafx-graphics', version: javaFxVersion, classifier: 'mac'
+    implementation group: 'org.openjfx', name: 'javafx-graphics', version: javaFxVersion, classifier: 'linux'
 }
 
 test {
@@ -29,7 +42,7 @@ test {
 }
 
 application {
-    mainClassName = "wessy.Wessy"
+    mainClassName = "wessy.Launcher"
 }
 
 shadowJar {

src/main/java/wessy/Launcher.java

@@ -0,0 +1,12 @@
+package wessy;
+
+import javafx.application.Application;
+
+/**
+ * A launcher class to workaround classpath issues.
+ */
+public class Launcher {
+    public static void main(String[] args) {
+        Application.launch(Main.class, args);
+    }
+}

src/main/java/wessy/Main.java

@@ -0,0 +1,33 @@
+package wessy;
+
+import java.io.IOException;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.layout.AnchorPane;
+import javafx.stage.Stage;
+import wessy.javafxnodes.DialogBox;
+import wessy.javafxnodes.MainWindow;
+
+/**
+ * A GUI for Wessy using FXML.
+ */
+public class Main extends Application {
+
+    private Wessy wessy = new Wessy();
+
+    @Override
+    public void start(Stage stage) {
+        try {
+            FXMLLoader fxmlLoader = new FXMLLoader(wessy.Main.class.getResource("/view/MainWindow.fxml"));
+            AnchorPane ap = fxmlLoader.load();
+            Scene scene = new Scene(ap);
+            stage.setScene(scene);
+            fxmlLoader.<MainWindow>getController().setWessy(wessy);
+            stage.show();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/wessy/Wessy.java

@@ -3,6 +3,7 @@
 import java.io.IOException;
 import java.time.format.DateTimeParseException;
 
+import wessy.components.*;
 import wessy.task.Task;
 
 import wessy.exceptions.WessyException;
@@ -41,6 +42,10 @@ public Wessy(String filePath) {
         tasks = loadedTasks;
     }
 
+    public Wessy() {
+        this("data/savedTasks.txt");
+    }
+
     /**
      *
      */
@@ -122,7 +127,6 @@ public void run() {
             } catch (IOException ioe) {
                 ui.handleException("There is some issue in the input-output operation.");
                 ioe.printStackTrace();
-
             } catch (WessyException we) {
                 ui.handleException(we.toString());
             } catch (Exception ex) {
@@ -141,10 +145,10 @@ public static void main(String[] args) {
     }
 
     /**
-     * A helper function
+     *
      */
-    private void startsUp() {
-        ui.printWelcomeMessage(tasks.printAsStr(), tasks.getSize());
+    public String startsUp() {
+        return ui.printWelcomeMessage(tasks.printAsStr());
     }
 
     /**
@@ -172,4 +176,82 @@ void saveToStorage() throws IOException {
         storage.save(tasks.saveAsStr());
     }
 
+
+
+    public String respond(String userInput) {
+        try {
+            CmdType cmd = Parser.getCmd(userInput);
+            if (cmd == null) {
+                throw new CommandNotFoundException();
+            }
+            UserInputChecker.checkSpacingAftCmd(userInput, cmd);
+
+            switch (cmd) {
+
+                case BYE:
+                    return ui.printByeMessage();
+                case LIST:
+                    return ui.printListOrFindMessage(tasks.printAsStr(), true);
+                case TODO:
+                    // Fallthrough
+                case DEADLINE:
+                    // Fallthrough
+                case EVENT:
+
+                    UserInputChecker.checkMissingInput(userInput, cmd);
+                    UserInputChecker.checkMissingKeyword(userInput, cmd);
+                    if (cmd == CmdType.DEADLINE) {
+                        UserInputChecker.checkDeadlineMissingInput(userInput);
+                    } else if (cmd == CmdType.EVENT) {
+                        UserInputChecker.checkEventMissingInput(userInput);
+                    }
+
+                    String[] taskComponents = Parser.getTaskComponents(userInput, cmd);
+                    Task newTask = tasks.add(taskComponents);
+                    saveToStorage();
+                    return ui.printAddedMessage(newTask, tasks.getSize());
+
+                case MARK:
+                case UNMARK:
+                    checkBeforeParse(userInput, cmd);
+
+                    boolean isMark = cmd == CmdType.MARK;
+                    Task updatedTask = tasks.markOrUnmark(Parser.parseInt(userInput, cmd), isMark);
+                    saveToStorage();
+                    return ui.printMarkUnmarkMessage(updatedTask, isMark);
+
+                case DELETE:
+                    checkBeforeParse(userInput, cmd);
+
+                    Task deletedTask = tasks.delete(Parser.parseInt(userInput, cmd));
+                    saveToStorage();
+                    return ui.printDeleteMessage(deletedTask, tasks.getSize());
+
+                case FIND:
+                    String target = userInput.substring(cmd.getStrLength() + 1);
+                    return ui.printListOrFindMessage(tasks.find(target), false);
+
+                case CLEAR:
+                    tasks.clear();
+                    saveToStorage();
+                    return ui.printClearMessage();
+                    // Fallthrough
+            }
+
+        } catch (DateTimeParseException dtpe) {
+            return ui.handleException("Please enter the date (and time, if any) in the correct format.");
+        } catch (SecurityException se) {
+            se.printStackTrace();
+            return ui.handleException("You do not have the permission to access the file.");
+        } catch (IOException ioe) {
+            ioe.printStackTrace();
+            return ui.handleException("There is some issue in the input-output operation.");
+
+        } catch (WessyException we) {
+            return ui.printMessage(we.toString());
+        } catch (Exception ex) {
+            return ui.printMessage(ex.getMessage());
+        }
+        return ui.printMessage(new CommandNotFoundException().toString());
+    }
 }