Add update functionality

data/duke.txt

@@ -1,8 +1,8 @@
 E | N | Finals | 2023-11-11 | 2023-11-12
 T | Y | read book
 T | N | return book
-D | N | write book | 2022-11-11
+D | N | write book | 2023-10-10
 E | N | book fair | 2000-11-11 | 2000-11-11
-T | N | jebfw
+T | N | test
 D | N | da | 2020-01-01
-E | N | da | 2020-10-10 | 2020-10-11
+E | N | asdbf | 2020-10-10 | 2020-10-11

src/main/java/duke/DialogBox.java

@@ -9,7 +9,6 @@
 import javafx.fxml.FXMLLoader;
 import javafx.geometry.Pos;
 import javafx.scene.Node;
-import javafx.scene.control.Label;
 import javafx.scene.image.Image;
 import javafx.scene.image.ImageView;
 import javafx.scene.layout.HBox;

src/main/java/duke/Duke.java

@@ -2,7 +2,6 @@
 
 import java.nio.file.Path;
 import java.nio.file.Paths;
-
 import java.util.Scanner;
 
 /**
@@ -15,13 +14,6 @@ public class Duke {
     private TaskList tasks;
     static final Path FILEPATH = Paths.get(".", "data", "duke.txt"); // Filepath: "./data/duke.txt"
 
-    public String getResponse(String input) {
-        Parser parser = new Parser(tasks);
-        String response = parser.parse(input);
-        assert response != null;
-        return response;
-    }
-
     /**
      * Constructor to start the program.
      */
@@ -52,6 +44,13 @@ public void updateTaskList() {
         storage.updateTaskList();
     }
 
+    public String getResponse(String input) {
+        Parser parser = new Parser(tasks);
+        String response = parser.parse(input);
+        assert response != null;
+        return response;
+    }
+
     /**
      * Starts the program and loads in the saved task list.
      *

src/main/java/duke/Launcher.java

@@ -9,4 +9,4 @@ public class Launcher {
     public static void main(String[] args) {
         Application.launch(Main.class, args);
     }
-}
+}

src/main/java/duke/MainWindow.java

@@ -2,7 +2,6 @@
 
 import javafx.fxml.FXML;
 import javafx.scene.control.Button;
-import javafx.scene.control.Label;
 import javafx.scene.control.ScrollPane;
 import javafx.scene.control.TextField;
 import javafx.scene.image.Image;
@@ -18,18 +17,12 @@ public class MainWindow extends AnchorPane {
     private VBox dialogContainer;
     @FXML
     private TextField userInput;
-    @FXML
-    private Button sendButton;
-
     private Duke duke;
     static final String INITIAL_RESPONSE = "Hello, I'm your task manager :)\nWhat can I do for you?";
     static final String FINAL_RESPONSE = "Bye. Hope to see you again soon!";
-
     private Image userImage = new Image(this.getClass().getResourceAsStream("/images/DaUser.png"));
     private Image dukeImage = new Image(this.getClass().getResourceAsStream("/images/DaDuke.png"));
 
-
-
     @FXML
     public void initialize() {
         scrollPane.vvalueProperty().bind(dialogContainer.heightProperty());

src/main/java/duke/Parser.java

@@ -48,11 +48,13 @@ public String parse(String s) {
             output = tasks.addToDo(input);
         } else if (command.equals("find")) {
             output = tasks.findTasks(input);
+        } else if (command.equals("update")) {
+            output = tasks.updateTask(input);
         } else if (command.equals("bye")) {
             this.isFinished = true;
             output = Ui.bye();
             Platform.exit();
-        } else{
+        } else {
             output = Ui.unknownCommandErrorMessage();
         }
         Ui.horizontalLine();

src/main/java/duke/TaskList.java

@@ -102,8 +102,8 @@ public String deleteTask(String[] input) {
             Task task = taskList.get(toDelete - 1);
             String deletedTask = task.toString();
             taskList.remove(toDelete - 1);
-            String output = "Noted. I've removed this task:\n" +
-                    deletedTask + "\n" + "Number of tasks: " + taskList.size();
+            String output = "Noted. I've removed this task:\n"
+                    + deletedTask + "\n" + "Number of tasks: " + taskList.size();
             System.out.println(output);
             return output;
         } catch (IndexOutOfBoundsException e) {
@@ -131,8 +131,8 @@ public String addEvent(String[] input) {
             }
             Event e = new Event(desc, LocalDate.parse(from), LocalDate.parse(to));
             taskList.add(e);
-            String output = "Got it. I've added this task:\n" +
-                    e.toString() + "\n" + "Number of tasks: " + taskList.size();
+            String output = "Got it. I've added this task:\n"
+                    + e.toString() + "\n" + "Number of tasks: " + taskList.size();
             System.out.println(output);
             return output;
         } catch (DukeException e) {
@@ -160,8 +160,8 @@ public String addDeadline(String[] input) {
             }
             Deadline d = new Deadline(desc, LocalDate.parse(deadline));
             taskList.add(d);
-            String output = "Got it. I've added this task:\n" +
-                    d.toString() + "\n" + "Number of tasks: " + taskList.size();
+            String output = "Got it. I've added this task:\n"
+                    + d.toString() + "\n" + "Number of tasks: " + taskList.size();
             System.out.println(output);
             return output;
         } catch (DukeException e) {
@@ -187,8 +187,8 @@ public String addToDo(String[] input) {
             }
             ToDo t = new ToDo(desc);
             taskList.add(t);
-            String output = "Got it. I've added this task:\n" +
-                    t.toString() + "\n" + "Number of tasks: " + taskList.size();
+            String output = "Got it. I've added this task:\n"
+                    + t.toString() + "\n" + "Number of tasks: " + taskList.size();
             System.out.println(output);
             return output;
         } catch (IndexOutOfBoundsException e) {
@@ -227,4 +227,67 @@ public String findTasks(String[] input) {
             return e.getMessage();
         }
     }
+
+    public String updateTask(String[] input) {
+        try {
+            String[] s1 = input[1].split("/", 2);
+            String[] s2 = s1[1].split(" ", 2);
+            String taskNumber = s1[0].strip();
+            String updateType = s2[0].strip();
+            String newValue = s2[1].strip();
+            if (Integer.parseInt(taskNumber) > taskList.size()) {
+                throw new DukeException(Ui.taskNotFoundErrorMessage());
+            }
+            if (taskNumber.equals("") || updateType.equals("") || newValue.equals("")) {
+                throw new DukeException(Ui.updateTaskErrorMessage());
+            }
+            Task task = taskList.get(Integer.parseInt(taskNumber) - 1);
+            updateTaskValue(task, updateType, newValue);
+            String output = "OK, I've updated this task:\n" + task.toString();
+            System.out.println(output);
+            return output;
+        } catch (IndexOutOfBoundsException e) {
+            return Ui.updateTaskErrorMessage();
+        } catch (NumberFormatException e) {
+            return Ui.updateTaskErrorMessage();
+        } catch (DukeException e) {
+            return e.getMessage();
+        } catch (DateTimeParseException e) {
+            return Ui.invalidDateErrorMessage();
+        }
+    }
+
+    private void updateTaskValue(Task task, String toUpdate, String newValue) throws DukeException {
+        switch (toUpdate) {
+        case "desc":
+            task.updateDescription(newValue);
+            break;
+        case "by":
+            if (task instanceof Deadline) {
+                Deadline d = (Deadline) task;
+                d.updateByDate(LocalDate.parse(newValue));
+            } else {
+                throw new DukeException(Ui.wrongTaskTypeErrorMessage());
+            }
+            break;
+        case "from":
+            if (task instanceof Event) {
+                Event e = (Event) task;
+                e.updateFromDate(LocalDate.parse(newValue));
+            } else {
+                throw new DukeException(Ui.wrongTaskTypeErrorMessage());
+            }
+            break;
+        case "to":
+            if (task instanceof Event) {
+                Event e = (Event) task;
+                e.updateToDate(LocalDate.parse(newValue));
+            } else {
+                throw new DukeException(Ui.wrongTaskTypeErrorMessage());
+            }
+            break;
+        default:
+            throw new DukeException(Ui.updateTaskErrorMessage());
+        }
+    }
 }

src/main/java/duke/Ui.java

@@ -58,6 +58,18 @@ public static String markTaskErrorMessage() {
         return output;
     }
 
+    public static String updateTaskErrorMessage() {
+        String output = "Format: update taskNumber /(desc, by, from, to) value, e.g. update 1 /from 2023-12-30";
+        System.out.println(output);
+        return output;
+    }
+
+    public static String wrongTaskTypeErrorMessage() {
+        String output = "This task type does not have the required field.";
+        System.out.println(output);
+        return output;
+    }
+
     public static String unmarkTaskErrorMessage() {
         String output = "Please enter a number e.g., unmark 1";
         System.out.println(output);

src/main/java/duke/task/Deadline.java

@@ -62,4 +62,8 @@ public boolean equals(Object o) {
         Deadline c = (Deadline) o;
         return this.toString().equals(c.toString());
     }
+
+    public void updateByDate(LocalDate newDate) {
+        by = newDate;
+    }
 }

src/main/java/duke/task/Event.java

@@ -52,4 +52,12 @@ public String toString() {
     public String taskToString() {
         return "E | " + super.taskToString() + " | " + from + " | " + to;
     }
+
+    public void updateFromDate(LocalDate newDate) {
+        from = newDate;
+    }
+
+    public void updateToDate(LocalDate newDate) {
+        to = newDate;
+    }
 }

src/main/java/duke/task/Task.java

@@ -63,4 +63,8 @@ public String toString() {
     public String taskToString() {
         return String.format("%s | " + this.description, (isDone ? "Y" : "N"));
     }
+
+    public void updateDescription(String newDesc) {
+        description = newDesc;
+    }
 }