Duke - A CLI Task Management Chatbot

🤖 Overview

Duke is a command-line interface (CLI) chatbot that helps users manage their tasks, events, and deadlines through natural language interaction. Built in Java, it demonstrates object-oriented programming principles and clean architecture design.

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Hello! I'm Duke 🤖
What can I do for you today?

✨ Features

Task Management

• Add Tasks: Create different types of tasks

  todo read book
  deadline return book /by Sunday
  event team meeting /at Mon 2-4pm
  

• List Tasks: View all tasks

  list
  1.[✓] read book
  2.[✗] return book (by: Sunday)
  3.[✗] team meeting (at: Mon 2-4pm)
  

• Mark Tasks: Mark tasks as done

  done 1
  Marked this task as done:
  [✓] read book
  

• Delete Tasks: Remove tasks

  delete 2
  Removed this task:
  [✗] return book (by: Sunday)
  

Data Persistence

• Automatically saves tasks to local storage
• Loads previous tasks on startup
• Maintains task state between sessions

🏗️ Architecture

src/
├── main/
│   ├── java/
│   │   ├── duke/
│   │   │   ├── Duke.java           # Main application class
│   │   │   ├── command/            # Command pattern implementation
│   │   │   ├── parser/             # Input parsing logic
│   │   │   ├── storage/            # Data persistence
│   │   │   ├── task/              # Task-related classes
│   │   │   └── ui/                # User interface
│   └── resources/
└── test/
    └── java/
        └── duke/                   # Test classes

Design Patterns Used

1. Command Pattern: For executing different user commands
2. Singleton Pattern: For storage management
3. Factory Pattern: For creating different task types

🚀 Getting Started

Prerequisites

• JDK 11 or higher
• IntelliJ IDEA (recommended)

Installation

1. Clone the repository

git clone https://github.com/yourusername/duke.git

2. Open in IntelliJ IDEA

• Click Open
• Select the project directory
• Wait for project indexing to complete

3. Configure JDK

• Set Project SDK to JDK 11
• Set Project language level to SDK default

4. Run the application

./gradlew run

Running Tests

./gradlew test

💻 Usage Examples

Basic Task Management

> todo read book
Got it. I've added this task:
[✗] read book
Now you have 1 tasks in the list.

> deadline return book /by Sunday
Got it. I've added this task:
[✗] return book (by: Sunday)
Now you have 2 tasks in the list.

> done 1
Nice! I've marked this task as done:
[✓] read book

Finding Tasks

> find book
Here are the matching tasks in your list:
1.[✓] read book
2.[✗] return book (by: Sunday)

Error Handling

> done 999
☹ OOPS!!! The task number is invalid.

> todo
☹ OOPS!!! The description of a todo cannot be empty.

🧪 Testing

Unit Tests

• Task creation and manipulation
• Command parsing
• Storage operations

Integration Tests

• End-to-end command execution
• Data persistence
• Error handling

📝 Class Documentation

Core Classes

Duke

Main class that orchestrates the chatbot's operations

public class Duke {
    private Storage storage;
    private TaskList tasks;
    private Ui ui;
    
    public Duke(String filePath) {
        // Initialize components
    }
    
    public void run() {
        // Main operation loop
    }
}

Task

Base class for all task types

public abstract class Task {
    protected String description;
    protected boolean isDone;
    
    public Task(String description) {
        this.description = description;
        this.isDone = false;
    }
    
    // Common task methods
}

🛠️ Technical Implementation

Data Storage

• Uses text file for persistence
• Custom serialization format
• Atomic write operations

Error Handling

• Custom exceptions for different scenarios
• Graceful error recovery
• User-friendly error messages

Input Processing

• Command parsing using regex
• Flexible date/time format parsing