Project Duke

The project consists of the following increments:

• Levels: A series of features, meant to be added to Duke in the given order, although some can be skipped. These have been named Level 1 to Level 10 to indicate how each makes the product progressively "level up".
• Extensions:
  • Category A These are internal/feature enhancements meant to help you practice a specific Java or an SE technique.
  • Category B These are enhancements related to task tracking.
  • Category C These are enhancements, not specifically related to task tracking.
  • Category D Each of these adds the ability to track another type of entities.

When implementing this feature, you are also recommended to implement the following extension:

public class Task {
    protected String description;
    protected boolean isDone;

    public Task(String description) {
        this.description = description;
        this.isDone = false;
    }

    public String getStatusIcon() {
        return (isDone ? "X" : " "); // mark done task with X
    }

    //...
}

Task t = new Task("read book");
t.markAsDone();

When implementing this feature, you are also recommended to implement the following extension:

public class Deadline extends Task {

    protected String by;

    public Deadline(String description, String by) {
        super(description);
        this.by = by;
    }

    @Override
    public String toString() {
        return "[D]" + super.toString() + " (by: " + by + ")";
    }
}

Task[] tasks = new Task[100];
task[0] = new Deadline("return book", "Monday");

When implementing this feature, you are also recommended to implement the following extension:

When implementing this feature, you are also recommended to implement the following extension:

While it is possible to represent a task list as a multi-dimensional array containing String, int, boolean etc.primitive values, the more natural approach is to use a Task class to represent tasks.

public class Task {
    protected String description;
    protected boolean isDone;

    public Task(String description) {
        this.description = description;
        this.isDone = false;
    }

    public String getStatusIcon() {
        return (isDone ? "X" : " "); // mark done task with X
    }

    //...
}

Task t = new Task("read book");
t.markAsDone();

As there are multiple types of tasks that have some similarity between them, you can implement classes Todo, Deadline and Event classes to inherit from a Task class.

Furthermore, use polymorphism to store all tasks in a data structure containing Task objects e.g., Task[100].

public class Deadline extends Task {

    protected String by;

    public Deadline(String description, String by) {
        super(description);
        this.by = by;
    }

    @Override
    public String toString() {
        return "[D]" + super.toString() + " (by: " + by + ")";
    }
}

Task[] tasks = new Task[100];
task[0] = new Deadline("return book", "Monday");

Make the Task class an abstract class. If applicable, use abstract methods as well.

Use exceptions to handle errors. For example, define a class DukeException to represent exceptions specific to Duke.

Use the input/output redirection technique to semi-automate the testing of Duke.

Notes:

• A tutorial of this technique is here.
• The required scripts are provided in the Duke repo (see the text-ui-test folder).

Use Java Collections classes for storing data. For example, you can use an ArrayList<Task> to store the tasks.

Refactor the code to extract out closely related code as classes.

• Minimal: Extract the following classes:
  • Ui: deals with interactions with the user
  • Storage: deals with loading tasks from the file and saving tasks in the file
  • Parser: deals with making sense of the user command
  • TaskList: contains the task list e.g., it has operations to add/delete tasks in the list

public class Duke {

    private Storage storage;
    private TaskList tasks;
    private Ui ui;

    public Duke(String filePath) {
        ui = new Ui();
        storage = new Storage(filePath);
        try {
            tasks = new TaskList(storage.load());
        } catch (DukeException e) {
            ui.showLoadingError();
            tasks = new TaskList();
        }
    }

    public void run() {
        //...
    }

    public static void main(String[] args) {
        new Duke("data/tasks.txt").run();
    }
}

• Stretch Goal: Consider extracting more classes. e.g., *Command classes (i.e., AddCommand, DeleteCommand, ExitCommand etc.) that inherits from an abstract Command class, so that you can write the main logic of the App as follows:

  public void run() {
      ui.showWelcome();
      boolean isExit = false;
      while (!isExit) {
          try {
              String fullCommand = ui.readCommand();
              ui.showLine(); // show the divider line ("_______")
              Command c = Parser.parse(fullCommand);
              c.execute(tasks, ui, storage);
              isExit = c.isExit();
          } catch (DukeException e) {
              ui.showError(e.getMessage());
          } finally {
              ui.showLine();
          }
      }
  }
  

  You can get some inspiration from how the code of the addressbook-level2 is organized.

Add JUnit tests to test the behavior of the code.

Requirements:

• Minimum: More than two test methods, preferably targeting more than one class (if you have multiple classes)
• Stretch goal: test methods to target all public methods of all classes

Refer to the JUnit tutorial @se-edu/guides to find how to use JUnit.

Organize the classes into suitable java packages.

• Minimal: put all classes in one package e.g., duke
• Stretch goal: divide into multiple packages as the number of classes increase e.g., duke.task, duke.command

Add JavaDoc comments to the code.

• Minimal: Add header comments to at least half of the non-private classes/methods.
• Stretch goal: Add header comments to all non-private classes/methods, and non-trivial private methods.

Tweak the code to comply with a given coding standard. From this point onward, ensure any new code added are compliant with the given coding standard.

Use checkStyle to detect coding style violations.

Refer the tutorial Using Checkstyle @SE-EDU/guides to learn how to use Checkstyle.

Critically examines the code and refactor to improve the code quality where necessary.

When adding this increment, follow closely the 'Code Quality' topics you have learned so far, rather than merely follow your own intuition about code quality.

Use assert feature (not JUnit assertions) to document important assumptions that should hold at various points in the code.

Package the app as an executable JAR file so that it can be distributed easily.

You can assume the user will run the jar file in the following way only:

• Copy the jar file into an empty folder
• Open a command window in that folder
• Run the command java -jar {filename}.jar e.g., java -jar Duke.jar (i.e., run the command in the same folder as the jar file)

Refer to the tutorial Working with JAR files @SE-EDU/guides to find how to create JAR files.

Do not commit the JAR file created. Instead, you can make the JAR file available in the following manner.

• Go to your fork on GitHub and create a new release.
• In the page where you fill the details of the release,
  • give an appropriate version number e.g., v0.1
  • attach the JAR file where it says Attach binaries by dropping them ....

Use Gradle to automate some of the build tasks of the project.

Refer to the Gradle tutorial @SE-EDU to learn how to use Gradle.

Gradle support is provided as a separate branch (named add-gradle-support) in the Duke repo. Therefore, you can follow the scenario 2 in the above guide.

• Minimal: Set up gradle so that you can build and run Duke using gradle.
• Recommended: Set up gradle to run unit tests.
• Stretch Goal: Use gradle to automate more things in your project.

Use GitHub Actions to set up Continuous Integration (CI).

The workflow specified by this .yml file is a good candidate for this project. The last three segments are related to I/O redirection tests; can be deleted if not applicable to your project.

Refer to the Using GitHub Actions @SE-EDU/guides to learn how to use that .yml file to set up GitHub actions.

Use Java enums, if applicable.

Use Java varargs feature, if applicable.

Use the Lambdas feature of Java in your code, if applicable.

Use the Streams feature of Java in your code, if applicable.

Use third-party libraries in your project. For example, you can use the Natty library to parse strings into meaningful dates.

Add a User Guide to the project. Here is one simple way to do it.

• Update the given docs\README.md. See this guide to GitHub flavored Markdown (GFMD).
• Go to the settings page of your Duke fork and enable GitHub pages to publish from the docs folder (you can select a theme too).
• Go to http://{your username}.github.io/{repo name}/ to view the user guide of your product. Note: it could take 5-10 minutes for GitHub to update the page.

Add a Developer Guide to the project, explaining the design and implementation to future developers.

Release the product to be used by potential users. e.g., you can make it available on GitHub

Improve the GUI to make it more polished. Some examples:

• Tweak the GUI to match the asymmetric nature of the conversation: As the conversation is between the user and the app (not between two humans), it is asymmetric in nature. Accordingly, it makes sense not to display both sides of the conversion in the same visual format.
• Highlight errors e.g., when the user types a wrong command, the error should be shown in a different format to catch ther user's attention.
• Tweak padding, fonts, colors, alignments to make the GUI more pleasing to look at.
  Given the app is likely to take only a small portion of the screen, and the bot replies can contain lot of text, try to optimize for space (e.g., avoid wasting display space that simply shows the background graphics)
• Profile pictures: If your GUI shows profile pictures, you can tweak the way the picture is shown (e.g., crop as a circle or a square with rounded corners). In fact, an easy tweak is to use a picture with a transparent background so that it blends nicely with the background.
  Given that the participants of the conversion are fixed (i.e., you and the chatbot), do you even need big profile pictures?

You can take inspiration from these past projects. If you adopt any ideas from them, don't forget to give credit to the original author.

Provide a way for an event to be tentatively scheduled in multiple slots, and later to be confirmed to one the slots.

Provide a way to easily snooze/postpone/reschedule tasks.

Provide support for managing recurring tasks e.g., a weekly project meeting.

Support the managing of tasks that need to be done after a specific time/task e.g., return book after the exam is over.

Provide support for managing tasks that need to be done within a certain period e.g., collect certificate between Jan 15 and 25th.

Provide support for managing tasks that takes a fixed amount of time but does not have a fixed start/end time e.g., reading the sales report (needs 2 hours).

Provide a way to get reminders about tasks e.g., remind the user about upcoming deadlines.

Provide a way for the user to find free times e.g., when is the nearest day in which I have a 4 hour free slot?.

Provide a way to view tasks in the form of a schedule e.g., view the schedule for a specific date.

Deal with schedule anomalies e.g., detect if a task being added clashes with another task in the list.

Add the ability to recognize and deal with duplicate items. e.g., the same task added multiple times.

Provide more flexibility with the data source e.g., the ability for the user to specify which file to use as the data source.

The ability to sort items e.g., sort deadlines chronologically.

Support more natural date formats e.g., Mon in a user command can be interpreted as the date of the next Monday in the calendar.

All more flexibility in search e.g., find items even if the keyword matches the item only partially.

Support a way to easily edit details of items e.g., change the end time of an event without changing anything else.

Minimal: the ability to update an existing item without having to delete it first

Other ideas:

• the ability to clone items (to easily create new items based on existing items)

Provide a way to tag items e.g., tag a task as #fun.

Provide a way to attach priorities to items e.g., mark an item as a high priority (or priority level 1).

Provide a way to archive items so that the user can remove items from the app but still keep a record of them somewhere e.g., archive all tasks in the list into a file so that the user can start over with a clean slate.

Provide a way to perform tasks on multiple items e.g., delete some specific items in one go.

Provide a way to leverage statistics about the items managed by the App e.g., show the number of tasks that have been completed in the past week.

Provide a way to undo a command.

Minimal: the ability to undo the most recent command.

Provide in-App guidance to users.

Minimal: add a command to access a help page.

Other ideas:

• Load the App with some sample data at the first run.

Make the command syntax more flexible.

Minimal: provide shorter aliases for keywords e.g., t can be shorter alias for todo.

Other ideas:

• Allow users to define their own aliases
• Remove the need for the parts of a command to be in a specific order

Support managing info about contacts e.g., details of friends

Support managing info about small snippets of textual information the user wants to record e.g., one's own waist size, a name of a movie that the user wants to remember

Support managing info about expenses e.g., the amounts spent on food, books, transport, etc.

Support keeping records of loans given/taken e.g., money lent/owed to colleagues/friends

Support recording info about places e.g., info about restaurants visited, for future reference

Provide the ability to learn/memorize thingse.g., learn vocabulary, answers to questions

Support managing info about clients e.g., for an insurance agent to keep track of clients

Support managing info about merchandise e.g., a property agent to keep track of properties, a collector of stamps keep track of items in the collection