Refactor Ui code

Abstracted Add, Delete and Done printing code to the Ui class as functions.
Also fixed assertion bug and test cases.

src/main/java/Duke.java

@@ -24,10 +24,10 @@ public Duke() {
         ui = new Ui();
         storage = new Storage(filePath);
         try {
-            taskList = new TaskList(storage.loadData());
+            taskList = new TaskList(storage.loadData(), ui);
         } catch (DukeException e) {
             ui.showError(e.getMessage());
-            taskList = new TaskList();
+            taskList = new TaskList(ui);
         }
     }
 
@@ -42,17 +42,17 @@ public String getResponse(String input) {
             String fullCommand = input;
             String[] commandArr = fullCommand.split(" ", 2);
             Command c = Parser.parse(commandArr[0].trim());
-            if (commandArr.length > 1) {
-                return c.execute(storage, taskList, ui, commandArr[1].trim());
-            } else {
+            if (commandArr.length <= 1) {
                 return c.execute(storage, taskList, ui, "");
             }
+            return c.execute(storage, taskList, ui, commandArr[1].trim());
         } catch (DukeException e) {
             return ui.showError(e.getMessage());
         }
     }
 
     /*
+    // Legacy code for starting up Duke in Command Line
     /**
      * Method to start up Duke Chatbot.
      *

src/main/java/TaskList.java

@@ -6,21 +6,25 @@
 public class TaskList {
 
     private ArrayList<Task> list;
+    private Ui ui;
 
     /**
-     * Default Constructor to generate an empty ArrayList of Task type.
+     * Constructor to generate an empty ArrayList of Task type and takes Ui for print functionality.
      */
-    public TaskList() {
+    public TaskList(Ui ui) {
         list = new ArrayList<>();
+        this.ui = ui;
     }
 
     /**
-     * Constructor to take in a populated ArrayList of Task type (i.e. from text file).
+     * Constructor to take in a populated ArrayList of Task type (i.e. from text file)
+     * and takes Ui for print functionality.
      *
      * @param list ArrayList of Task Type
      */
-    public TaskList(ArrayList<Task> list) {
+    public TaskList(ArrayList<Task> list, Ui ui) {
         this.list = list;
+        this.ui = ui;
     }
 
     /**
@@ -31,9 +35,7 @@ public TaskList(ArrayList<Task> list) {
      */
     public String addTask(Task task) {
         list.add(task);
-        String message = "Got it. I've added this task:\n" + task
-                + "\nNow you have " + list.size() + " tasks in the list.";
-        return message;
+        return ui.showAdd(task, list.size());
     }
 
     /**
@@ -43,11 +45,9 @@ public String addTask(Task task) {
      * @return confirmation message of task being deleted
      */
     public String deleteTask(int deleteIndex) {
-        assert deleteIndex < list.size() : "deleteIndex should not be larger than amount of tasks in list";
+        assert deleteIndex <= list.size() : "deleteIndex should not be larger than amount of tasks in list";
         Task temp = list.remove(deleteIndex - 1);
-        String message = "Noted. I've removed this task:\n" + temp
-                + "\nNow you have " + list.size() + " tasks in the list.";
-        return message;
+        return ui.showDelete(temp, list.size());
     }
 
     /**
@@ -102,11 +102,9 @@ public String setDoneTask(int doneIndex) {
         // Code for testing assertion
         doneIndex = 20;
          */
-        assert doneIndex < list.size() : "doneIndex should not be larger than amount of tasks in list";
+        assert doneIndex <= list.size() : "doneIndex should not be larger than amount of tasks in list";
         list.get(doneIndex - 1).markAsDone();
-        String message = "Nice! I've marked this task as done:\n"
-                + list.get(doneIndex - 1);
-        return message;
+        return ui.showDone(list.get(doneIndex - 1));
     }
 
     /**

src/main/java/Ui.java

@@ -1,7 +1,7 @@
 import java.util.Scanner;
 
 /**
- * Represents the User Interface of Duke, including the user input fields.
+ * Handles the printing of Duke messages.
  */
 public class Ui {
 
@@ -41,13 +41,6 @@ public String showGoodbye() {
         return endMessage;
     }
 
-    /**
-     * Prints a straight line for clarity purposes.
-     */
-    public void showLine() {
-        System.out.print(lineSpace);
-    }
-
     /**
      * Prints a specified error message.
      *
@@ -58,8 +51,56 @@ public String showError(String error) {
         return error;
     }
 
+    /**
+     * Prints a message when tasks are added.
+     *
+     * @param task Task being added
+     * @param listSize Size of list
+     * @return Message of successful add
+     */
+    public String showAdd(Task task, int listSize) {
+        String message = "Got it. I've added this task:\n" + task
+                + "\nNow you have " + listSize + " tasks in the list.";
+        return message;
+    }
+
+    /**
+     * Prints a message when tasks are set to done.
+     *
+     * @param task Task selected to be done
+     * @return Message of marking done
+     */
+    public String showDone(Task task) {
+        String message = "Nice! I've marked this task as done:\n"
+                + task;
+        return message;
+    }
+
+    /**
+     * Prints a message when tasks are deleted.
+     *
+     * @param task Task selected for deletion
+     * @param listSize Size of list
+     * @return Message of successful deletion
+     */
+    public String showDelete(Task task, int listSize) {
+        String message = "Noted. I've removed this task:\n" + task
+                + "\nNow you have " + listSize + " tasks in the list.";
+        return message;
+    }
+
+
+    /**
+     * Prints a straight line for clarity purposes.
+     * Legacy code for Command Line display.
+     */
+    public void showLine() {
+        System.out.print(lineSpace);
+    }
+
     /**
      * Reads the user input and returns a String.
+     * Legacy code for Command Line display.
      *
      * @return User input
      */

src/test/java/AddCommandTest.java

@@ -1,11 +1,9 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.CsvSource;
-
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.fail;
 
 public class AddCommandTest {
@@ -17,15 +15,15 @@ public class AddCommandTest {
     @BeforeEach
     void init() {
         storage = new Storage("");
-        taskList = new TaskList();
+        ui = new Ui();
+        taskList = new TaskList(ui);
     }
 
     @Test
     void testTodoExecute() {
         String input = "test ToDo";
         InputStream in = new ByteArrayInputStream((input.getBytes()));
         System.setIn(in);
-        ui = new Ui();
         try {
             AddToDoCommand ac = new AddToDoCommand();
             ac.execute(storage, taskList, ui, input);
@@ -39,7 +37,6 @@ void testDeadlineExecute() {
         String input = "test Deadline /by 08/08/2022 2359";
         InputStream in = new ByteArrayInputStream((input.getBytes()));
         System.setIn(in);
-        ui = new Ui();
         try {
             AddDeadlineCommand ac = new AddDeadlineCommand();
             ac.execute(storage, taskList, ui, input);
@@ -53,7 +50,6 @@ void testEventExecute() {
         String input = "party /at a certain place";
         InputStream in = new ByteArrayInputStream((input.getBytes()));
         System.setIn(in);
-        ui = new Ui();
         try {
             AddEventCommand ac = new AddEventCommand();
             ac.execute(storage, taskList, ui, input);

src/test/java/DeleteCommandTest.java

@@ -15,7 +15,8 @@ public class DeleteCommandTest {
     @BeforeEach
     void init() {
         storage = new Storage("");
-        taskList = new TaskList();
+        ui = new Ui();
+        taskList = new TaskList(ui);
         taskList.addTask(new Task("test task"));
     }
 
@@ -24,7 +25,6 @@ void testExecute() {
         String input = "1";
         InputStream in = new ByteArrayInputStream((input.getBytes()));
         System.setIn(in);
-        ui = new Ui();
         try {
             DeleteCommand dc = new DeleteCommand();
             dc.execute(storage, taskList, ui, input);

src/test/java/DoneCommandTest.java

@@ -15,7 +15,8 @@ public class DoneCommandTest {
     @BeforeEach
     void init() {
         storage = new Storage("");
-        taskList = new TaskList();
+        ui = new Ui();
+        taskList = new TaskList(ui);
         taskList.addTask(new Task("test task"));
     }
 
@@ -24,7 +25,6 @@ void testExecute() {
         String input = "1";
         InputStream in = new ByteArrayInputStream((input.getBytes()));
         System.setIn(in);
-        ui = new Ui();
         try {
             DoneCommand dc = new DoneCommand();
             dc.execute(storage, taskList, ui, input);