[Liu Yishan] iP

src/main/java/Lys.java

@@ -0,0 +1,188 @@
+import java.util.Scanner;
+
+abstract class Task {
+    protected String description;
+    protected boolean isDone;
+
+    public Task(String description) {
+        this.description = description;
+        this.isDone = false;
+    }
+
+    public void markAsDone() {
+        this.isDone = true;
+    }
+
+    public void unmarkAsDone() {
+        this.isDone = false;
+    }
+
+    public abstract String getTaskType();
+
+    @Override
+    public String toString() {
+        return "[" + getTaskType() + "][" + (isDone ? "X" : " ") + "] " + description;
+    }
+}
+
+class ToDo extends Task {
+    public ToDo(String description) {
+        super(description);
+    }
+
+    @Override
+    public String getTaskType() {
+        return "T";
+    }
+}
+
+class Deadline extends Task {
+    private String by;
+
+    public Deadline(String description, String by) {
+        super(description);
+        this.by = by;
+    }
+
+    @Override
+    public String getTaskType() {
+        return "D";
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + " (by: " + by + ")";
+    }
+}
+
+class Event extends Task {
+    private String from;
+    private String to;
+
+    public Event(String description, String from, String to) {
+        super(description);
+        this.from = from;
+        this.to = to;
+    }
+
+    @Override
+    public String getTaskType() {
+        return "E";
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + " (from: " + from + " to: " + to + ")";
+    }
+}
+
+public class Lys {
+    public static void main(String[] args) {
+        String logo = " ____        _        \n"
+                + "|  _ \\ _   _| | _____ \n"
+                + "| | | | | | | |/ / _ \\\n"
+                + "| |_| | |_| |   <  __/\n"
+                + "|____/ \\__,_|_|\\_\\___|\n";
+        System.out.println("Hello from\n" + logo);
+
+        System.out.println("____________________________________________________________");
+        System.out.println("Hello! I'm [YOUR CHATBOT NAME]");
+        System.out.println("What can I do for you?");
+        System.out.println("____________________________________________________________");
+
+        Scanner scanner = new Scanner(System.in);
+        Task[] tasks = new Task[100];
+        int taskCount = 0;
+
+        while (true) {
+            String input = scanner.nextLine().trim();
+            String[] words = input.split(" ", 2);
+            String command = words[0].toLowerCase();
+
+            try {
+                switch (command) {
+                    case "bye":
+                        System.out.println("____________________________________________________________");
+                        System.out.println("Bye. Hope to see you again soon!");
+                        System.out.println("____________________________________________________________");
+                        scanner.close();
+                        return;
+
+                    case "list":
+                        System.out.println("____________________________________________________________");
+                        if (taskCount == 0) {
+                            System.out.println("Your task list is empty.");
+                        } else {
+                            System.out.println("Here are the tasks in your list:");
+                            for (int i = 0; i < taskCount; i++) {
+                                System.out.println((i + 1) + "." + tasks[i]);
+                            }
+                        }
+                        System.out.println("____________________________________________________________");
+                        break;
+
+                    case "mark":
+                    case "unmark":
+                        int index = Integer.parseInt(words[1]) - 1;
+                        if (index < 0 || index >= taskCount) {
+                            throw new IndexOutOfBoundsException("Invalid task number.");
+                        }
+                        if (command.equals("mark")) {
+                            tasks[index].markAsDone();
+                            System.out.println("____________________________________________________________");
+                            System.out.println("Nice! I've marked this task as done:");
+                        } else {
+                            tasks[index].unmarkAsDone();
+                            System.out.println("____________________________________________________________");
+                            System.out.println("OK, I've marked this task as not done yet:");
+                        }
+                        System.out.println("  " + tasks[index]);
+                        System.out.println("____________________________________________________________");
+                        break;
+
+                    case "todo":
+                        if (words.length < 2 || words[1].trim().isEmpty()) {
+                            throw new IllegalArgumentException("The description of a todo cannot be empty.");
+                        }
+                        tasks[taskCount++] = new ToDo(words[1]);
+                        break;
+
+                    case "deadline":
+                        if (words.length < 2 || !words[1].contains(" /by ")) {
+                            throw new IllegalArgumentException("Deadline must be in format: deadline [task] /by [date].");
+                        }
+                        String[] deadlineParts = words[1].split(" /by ", 2);
+                        tasks[taskCount++] = new Deadline(deadlineParts[0], deadlineParts[1]);
+                        break;
+
+                    case "event":
+                        if (words.length < 2 || !words[1].contains(" /from ") || !words[1].contains(" /to ")) {
+                            throw new IllegalArgumentException("Event must be in format: event [task] /from [start] /to [end].");
+                        }
+                        String[] eventParts = words[1].split(" /from | /to ");
+                        if (eventParts.length < 3) {
+                            throw new IllegalArgumentException("Invalid event format.");
+                        }
+                        tasks[taskCount++] = new Event(eventParts[0], eventParts[1], eventParts[2]);
+                        break;
+
+                    default:
+                        throw new IllegalArgumentException("Sorry, I don't understand that command.");
+                }
+                System.out.println("____________________________________________________________");
+                System.out.println("Got it. I've added this task:");
+                System.out.println("  " + tasks[taskCount - 1]);
+                System.out.println("Now you have " + taskCount + " tasks in the list.");
+                System.out.println("____________________________________________________________");
+            } catch (NumberFormatException e) {
+                System.out.println("____________________________________________________________");
+                System.out.println("Please enter a valid task number.");
+                System.out.println("____________________________________________________________");
+            } catch (IndexOutOfBoundsException | IllegalArgumentException e) {
+                System.out.println("____________________________________________________________");
+                System.out.println("Error: " + e.getMessage());
+                System.out.println("____________________________________________________________");
+            }
+        }
+    }
+}