From dcc482955a511bbc6f4c00cf3af057ae530e67ef Mon Sep 17 00:00:00 2001
From: QianChangru <changru_qian@u.nus.edu>
Date: Sun, 10 Sep 2023 09:17:13 +0800
Subject: [PATCH 1/5] Add part of Java Doc.

---
 src/main/java/duke/Deadline.java |  7 +++++++
 src/main/java/duke/Event.java    |  6 ++++++
 src/main/java/duke/Parser.java   |  9 +++++++++
 src/main/java/duke/Task.java     | 20 +++++++++++++++++++-
 src/main/java/duke/ToDo.java     |  6 ++++++
 5 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/src/main/java/duke/Deadline.java b/src/main/java/duke/Deadline.java
index 91b42caf31..fefcc623a2 100644
--- a/src/main/java/duke/Deadline.java
+++ b/src/main/java/duke/Deadline.java
@@ -4,6 +4,10 @@
 import java.time.format.DateTimeFormatter;
 import java.util.Locale;
 
+
+/**
+ * Encapsulates deadline which are Tasks with start and end.
+ */
 public class Deadline extends Task {
     private LocalDate by;
     public Deadline(String description, LocalDate by) {
@@ -22,6 +26,9 @@ public String toString() {
                 + this.by.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH)) + ")";
     }
 
+    /**
+     * Returns a String representation of the task for storage.
+     */
     @Override
     public String toTxt() {
         return "D | " + super.toTxt()
diff --git a/src/main/java/duke/Event.java b/src/main/java/duke/Event.java
index f3e45a6969..101c8a07ef 100644
--- a/src/main/java/duke/Event.java
+++ b/src/main/java/duke/Event.java
@@ -4,6 +4,9 @@
 import java.time.format.DateTimeFormatter;
 import java.util.Locale;
 
+/**
+ * Encapsulates events which are Tasks with start and end.
+ */
 public class Event extends Task{
     private LocalDate startTime;
     private LocalDate endTime;
@@ -25,6 +28,9 @@ public String toString() {
                 + " to: " + endTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH)) + ")";
     }
 
+    /**
+     * Returns a String representation of the task for storage.
+     */
     @Override
     public String toTxt() {
         return "E | " + super.toTxt() + " | " + this.startTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH))
diff --git a/src/main/java/duke/Parser.java b/src/main/java/duke/Parser.java
index 6c5ab3ab6d..c7106c7b7f 100644
--- a/src/main/java/duke/Parser.java
+++ b/src/main/java/duke/Parser.java
@@ -2,6 +2,9 @@
 
 import java.time.LocalDate;
 
+/**
+ * Parses the user input.
+ */
 public class Parser {
     private String command;
     private Storage storage;
@@ -14,6 +17,9 @@ public Parser(String command, Storage storage, TaskList taskList) {
         this.taskList = taskList;
     }
 
+    /**
+     * Parses the user input and initiate following operations.
+     */
     public void parse() {
         try{
             if (command.startsWith("list")) {
@@ -51,6 +57,9 @@ public void parse() {
         }
     }
 
+    /**
+     * Returns if the parser is ended.
+     */
     public boolean isEnd() {
         return this.isEnd;
     }
diff --git a/src/main/java/duke/Task.java b/src/main/java/duke/Task.java
index b66103b33b..8fea81fb64 100644
--- a/src/main/java/duke/Task.java
+++ b/src/main/java/duke/Task.java
@@ -1,9 +1,17 @@
 package duke;
 
+/**
+ * Encapsulates tasks for the chatbot.
+ */
 public class Task {
     protected String description;
     protected boolean isDone;
 
+    /**
+     * Constructs a new Task object.
+     *
+     * @param description Description of the task.
+     */
     public Task(String description) {
         this.description = description;
         this.isDone = false;
@@ -14,10 +22,17 @@ public Task(String description, boolean isDone) {
         this.isDone = isDone;
     }
 
+    /**
+     * Gets the status Icon of the Task.
+     */
     public String getStatusIcon() {
-        return (isDone ? "X" : " "); // mark done task with X
+        // X for done task
+        return (isDone ? "X" : " ");
     }
 
+    /**
+     * Marks the task as done.
+     */
     public void markAsDone() {
         this.isDone = true;
     }
@@ -27,6 +42,9 @@ public String toString() {
         return "[" + this.getStatusIcon() + "] " + this.description;
     }
 
+    /**
+     * Returns a String representation of the task for storage.
+     */
     public String toTxt() {
         return (this.isDone ? "1" : "0") + " | " + this.description;
     }
diff --git a/src/main/java/duke/ToDo.java b/src/main/java/duke/ToDo.java
index d6c8f8de76..ad980857af 100644
--- a/src/main/java/duke/ToDo.java
+++ b/src/main/java/duke/ToDo.java
@@ -1,5 +1,8 @@
 package duke;
 
+/**
+ * Encapsulates todos which are Tasks.
+ */
 public class ToDo extends Task {
     public ToDo(String description) {
         super(description);
@@ -14,6 +17,9 @@ public String toString() {
         return "[T]" + super.toString();
     }
 
+    /**
+     * Returns a String representation of the task for storage.
+     */
     @Override
     public String toTxt() {
         return "T | " + super.toTxt();

From a011a9ef6f0e096ad9f323c8691cf06ecfe97766 Mon Sep 17 00:00:00 2001
From: QianChangru <changru_qian@u.nus.edu>
Date: Sun, 10 Sep 2023 09:24:11 +0800
Subject: [PATCH 2/5] Implement coding standard.

---
 src/main/java/duke/Deadline.java | 6 ++++--
 src/main/java/duke/Event.java    | 9 ++++++---
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/main/java/duke/Deadline.java b/src/main/java/duke/Deadline.java
index fefcc623a2..a3520f829f 100644
--- a/src/main/java/duke/Deadline.java
+++ b/src/main/java/duke/Deadline.java
@@ -23,7 +23,8 @@ public Deadline(String description, boolean isDone, LocalDate by) {
     @Override
     public String toString() {
         return "[D]" + super.toString() + " (by: "
-                + this.by.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH)) + ")";
+                + this.by.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH))
+                + ")";
     }
 
     /**
@@ -32,6 +33,7 @@ public String toString() {
     @Override
     public String toTxt() {
         return "D | " + super.toTxt()
-                + " | " + this.by.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
+                + " | "
+                + this.by.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
     }
 }
diff --git a/src/main/java/duke/Event.java b/src/main/java/duke/Event.java
index 101c8a07ef..265b80bfe2 100644
--- a/src/main/java/duke/Event.java
+++ b/src/main/java/duke/Event.java
@@ -24,8 +24,10 @@ public Event(String description, boolean isDone, LocalDate startTime, LocalDate
 
     @Override
     public String toString() {
-        return "[E]" + super.toString() + " (from: " + startTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH))
-                + " to: " + endTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH)) + ")";
+        return "[E]" + super.toString() + " (from: "
+                + startTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH))
+                + " to: "
+                + endTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH)) + ")";
     }
 
     /**
@@ -33,7 +35,8 @@ public String toString() {
      */
     @Override
     public String toTxt() {
-        return "E | " + super.toTxt() + " | " + this.startTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH))
+        return "E | " + super.toTxt() + " | "
+                + this.startTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH))
                 + " | " + this.endTime.format(DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
     }
 }

From b0af1ec175701908517fed9283e79de98aa59c34 Mon Sep 17 00:00:00 2001
From: QianChangru <changru_qian@u.nus.edu>
Date: Sun, 10 Sep 2023 10:04:25 +0800
Subject: [PATCH 3/5] Update JavaDoc

---
 data/tasks.txt                       |  1 -
 src/main/java/duke/Duke.java         |  6 +++
 src/main/java/duke/Storage.java      | 55 +++++++++++++++++++++-------
 src/main/java/duke/TaskList.java     | 23 +++++++++++-
 src/test/java/duke/TaskListTest.java |  7 ++++
 src/test/java/duke/TaskTest.java     |  7 ++++
 6 files changed, 83 insertions(+), 16 deletions(-)

diff --git a/data/tasks.txt b/data/tasks.txt
index 170108ab9f..e69de29bb2 100644
--- a/data/tasks.txt
+++ b/data/tasks.txt
@@ -1 +0,0 @@
-0 | test0 | test0 | test
\ No newline at end of file
diff --git a/src/main/java/duke/Duke.java b/src/main/java/duke/Duke.java
index 43aa9c1b4e..9f74969165 100644
--- a/src/main/java/duke/Duke.java
+++ b/src/main/java/duke/Duke.java
@@ -4,6 +4,9 @@
 
 import java.io.IOException;
 
+/**
+ * Encapsulates the chat bot.
+ */
 public class Duke {
 
     private Storage storage;
@@ -24,6 +27,9 @@ public Duke(String filePath) {
         }
     }
 
+    /**
+     * Runs the program.
+     */
     public void run() {
         Ui.welcomeMessage();
         Scanner userInput = new Scanner(System.in);
diff --git a/src/main/java/duke/Storage.java b/src/main/java/duke/Storage.java
index 3b9f2b95f6..c700c2f9fa 100644
--- a/src/main/java/duke/Storage.java
+++ b/src/main/java/duke/Storage.java
@@ -11,13 +11,22 @@
 import java.util.ArrayList;
 import java.util.Scanner;
 
+/**
+ * Manages storage of the task list.
+ */
 public class Storage {
-    private final String filePath;
+    private String filePath;
 
     public Storage(String filePath) {
         this.filePath = filePath;
     }
 
+    /**
+     * Loads the task list with file.
+     *
+     * @return The task list.
+     * @throws IOException If unable to gain input from file.
+     */
     public ArrayList<Task> load() throws IOException {
         File dir = new File("./data");
         if (!dir.exists()) {
@@ -28,12 +37,18 @@ public ArrayList<Task> load() throws IOException {
         Scanner s = new Scanner(f);
         ArrayList<Task> tasks = new ArrayList<>();
         while (s.hasNext()) {
-            tasks.add(addTask(s.nextLine()));
+            tasks.add(inputToTask(s.nextLine()));
         }
         return tasks;
     }
 
-    private Task addTask(String input) {
+    /**
+     * Converts the String input to Task.
+
+     * @param input The String input.
+     * @return The corresponding Task.
+     */
+    private Task inputToTask(String input) {
         String taskType = input.split(" \\| ")[0];
         boolean isComplete = input.split(" \\| ")[1].equals("1");
         String description = input.split(" \\| ")[2];
@@ -43,35 +58,47 @@ private Task addTask(String input) {
             LocalDate d = LocalDate.parse(input.split(" \\| ")[3], DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
             return new Deadline(description, isComplete, d);
         } else {
-            LocalDate start = LocalDate.parse(input.split(" \\| ")[3], DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
-            LocalDate end = LocalDate.parse(input.split(" \\| ")[4], DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
+            LocalDate start = LocalDate.parse(input.split(" \\| ")[3],
+                    DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
+            LocalDate end = LocalDate.parse(input.split(" \\| ")[4],
+                    DateTimeFormatter.ofPattern("MMM dd yyyy", Locale.ENGLISH));
             return new Event(description, isComplete, start, end);
         }
     }
 
 
-    public void addOneLineToFile(ArrayList<Task> list) throws DukeException {
+    /**
+     * Adds the last task in the task list to file.
+     *
+     * @param list The task list.
+     * @throws DukeException If unable to write to file.
+     */
+    public void addTheLastTaskToFile(ArrayList<Task> list) throws DukeException {
         try {
             FileWriter fw = new FileWriter(filePath, true);
-            if (list.size() == 1) {
-                fw.write(list.get(0).toTxt());
-            } else {
-                fw.write("\n" + list.get(list.size() - 1).toTxt());
+            if (list.size() != 1) {
+                fw.write("\n");
             }
+            fw.write(list.get(list.size() - 1).toTxt());
             fw.close();
         } catch (IOException e) {
             throw new DukeException("Unable to write to file.");
         }
     }
 
+    /**
+     * Rewrites the whole file with the task list.
+     *
+     * @param list The task list.
+     * @throws DukeException If unable to write to file.
+     */
     public void rewriteFile(ArrayList<Task> list) throws DukeException {
         try {
             FileWriter fw = new FileWriter(filePath);
             for (int i = 0; i < list.size(); i++) {
-                if (i == list.size() - 1) {
-                    fw.write(list.get(i).toTxt());
-                } else {
-                    fw.write(list.get(i).toTxt() + "\n");
+                fw.write(list.get(i).toTxt());
+                if (i != list.size() - 1) {
+                    fw.write("\n");
                 }
             }
             fw.close();
diff --git a/src/main/java/duke/TaskList.java b/src/main/java/duke/TaskList.java
index 57a33c6f4f..94bbaba096 100644
--- a/src/main/java/duke/TaskList.java
+++ b/src/main/java/duke/TaskList.java
@@ -2,6 +2,9 @@
 
 import java.util.ArrayList;
 
+/**
+ * Encapsulates task list in the chat bot.
+ */
 public class TaskList {
     protected ArrayList<Task> tasks;
     private Storage storage;
@@ -16,22 +19,40 @@ public TaskList(ArrayList<Task> tasks, Storage storage) {
         this.storage = storage;
     }
 
+    /**
+     * Lists all tasks in the task list.
+     */
     public void listTasks() {
         Ui.listTasks(this.tasks);
     }
 
+    /**
+     * Adds one task to the task list.
+     *
+     * @param t The task to be added.
+     */
     public void addTask(Task t) {
         this.tasks.add(t);
         Ui.addTask(t, this.tasks);
-        this.storage.addOneLineToFile(this.tasks);
+        this.storage.addTheLastTaskToFile(this.tasks);
     }
 
+    /**
+     * Deletes the task at the specified position in the task list.
+     *
+     * @param num The position starts from 0.
+     */
     public void deleteTask(int num) {
         Task re = tasks.remove(num);
         this.storage.rewriteFile(tasks);
         Ui.deleteTask(re, tasks);
     }
 
+    /**
+     * Marks the task at the specified position in the task list.
+     *
+     * @param num The position starts from 0.
+     */
     public void markTask(int num) {
         Task t = tasks.get(num);
         t.markAsDone();
diff --git a/src/test/java/duke/TaskListTest.java b/src/test/java/duke/TaskListTest.java
index 283788e544..08573d6120 100644
--- a/src/test/java/duke/TaskListTest.java
+++ b/src/test/java/duke/TaskListTest.java
@@ -6,7 +6,14 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+/**
+ * Tests TaskList class.
+ */
 public class TaskListTest {
+
+    /**
+     * Tests addTask function.
+     */
     @Test
     public void addTask() {
         Task t = new Task("test");
diff --git a/src/test/java/duke/TaskTest.java b/src/test/java/duke/TaskTest.java
index befb1c2423..061cdaf907 100644
--- a/src/test/java/duke/TaskTest.java
+++ b/src/test/java/duke/TaskTest.java
@@ -4,7 +4,14 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+/**
+ * Tests task class.
+ */
 public class TaskTest {
+
+    /**
+     * Tests markAsDone function.
+     */
     @Test
     public void markAsDone() {
         Task t = new Task("test", false);

From b47f6501e167a19c1c0a765be781eafc3420ca81 Mon Sep 17 00:00:00 2001
From: QianChangru <changru_qian@u.nus.edu>
Date: Sun, 10 Sep 2023 10:43:48 +0800
Subject: [PATCH 4/5] Update JavaDoc

---
 src/main/java/duke/DukeException.java |  3 +++
 src/main/java/duke/Ui.java            | 36 +++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/src/main/java/duke/DukeException.java b/src/main/java/duke/DukeException.java
index e20067cfb8..9ab095d0d0 100644
--- a/src/main/java/duke/DukeException.java
+++ b/src/main/java/duke/DukeException.java
@@ -1,5 +1,8 @@
 package duke;
 
+/**
+ * Encapsulates exception for the chat bot.
+ */
 public class DukeException extends RuntimeException{
     public DukeException(String message) {
         super(message);
diff --git a/src/main/java/duke/Ui.java b/src/main/java/duke/Ui.java
index a336d91e8c..4e5521399a 100644
--- a/src/main/java/duke/Ui.java
+++ b/src/main/java/duke/Ui.java
@@ -2,11 +2,17 @@
 
 import java.util.ArrayList;
 
+/**
+ * Encapsulates ui for chat bot.
+ */
 public class Ui {
     private static void printSeparationLine() {
         System.out.println("____________________________________________________________");
     }
 
+    /**
+     * Prints welcome message.
+     */
     public static void welcomeMessage() {
         Ui.printSeparationLine();
         System.out.println(" Hello! I'm Jarvis");
@@ -14,6 +20,11 @@ public static void welcomeMessage() {
         Ui.printSeparationLine();
     }
 
+    /**
+     * Prints all tasks in task list.
+     *
+     * @param tasks The task list.
+     */
     public static void listTasks(ArrayList<Task> tasks) {
         Ui.printSeparationLine();
         System.out.println(" Here are the tasks in your list:");
@@ -25,6 +36,11 @@ public static void listTasks(ArrayList<Task> tasks) {
         Ui.printSeparationLine();
     }
 
+    /**
+     * Prints message for marking a task.
+     *
+     * @param t The task marked.
+     */
     public static void markTask(Task t) {
         Ui.printSeparationLine();
         System.out.println(" Nice! I've marked this task as done:");
@@ -32,6 +48,12 @@ public static void markTask(Task t) {
         Ui.printSeparationLine();
     }
 
+    /**
+     * Prints the message for adding a task.
+     *
+     * @param t The task added.
+     * @param taskList The task list of the task.
+     */
     public static void addTask(Task t, ArrayList<Task> taskList) {
         Ui.printSeparationLine();
         System.out.println(" Got it. I've added this task:");
@@ -40,6 +62,12 @@ public static void addTask(Task t, ArrayList<Task> taskList) {
         Ui.printSeparationLine();
     }
 
+    /**
+     * Prints the message for deleting a task.
+     *
+     * @param t The task deleted.
+     * @param taskList The task list of the task.
+     */
     public static void deleteTask(Task t, ArrayList<Task> taskList) {
         Ui.printSeparationLine();
         System.out.println(" Noted. I've removed this task:");
@@ -48,12 +76,20 @@ public static void deleteTask(Task t, ArrayList<Task> taskList) {
         Ui.printSeparationLine();
     }
 
+    /**
+     * Prints the exception message.
+     *
+     * @param e The exception printed.
+     */
     public static void printException(DukeException e) {
         Ui.printSeparationLine();
         System.out.println(" " + e.getMessage());
         Ui.printSeparationLine();
     }
 
+    /**
+     * Prints farewell message.
+     */
     public static void farewellMessage() {
         Ui.printSeparationLine();
         System.out.println(" Bye. Hope to see you again soon!");

From c529dc9daf400749bcdb8e78040504ce545525c8 Mon Sep 17 00:00:00 2001
From: QianChangru <changru_qian@u.nus.edu>
Date: Sun, 10 Sep 2023 11:24:09 +0800
Subject: [PATCH 5/5] Start Level 9. Find

---
 src/main/java/duke/Parser.java   |  2 ++
 src/main/java/duke/TaskList.java | 15 +++++++++++++++
 src/main/java/duke/Ui.java       | 20 +++++++++++++++++++-
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/main/java/duke/Parser.java b/src/main/java/duke/Parser.java
index c7106c7b7f..ce83a1a25e 100644
--- a/src/main/java/duke/Parser.java
+++ b/src/main/java/duke/Parser.java
@@ -49,6 +49,8 @@ public void parse() {
             } else if (command.startsWith("bye")) {
                 this.isEnd = true;
                 Ui.farewellMessage();
+            } else if (command.startsWith("find")) {
+                String keyword = command.split(" ", 2)[1];
             } else {
                 throw new DukeException(" OOPS!!! I'm sorry, but I don't know what that means :-(");
             }
diff --git a/src/main/java/duke/TaskList.java b/src/main/java/duke/TaskList.java
index 94bbaba096..f127cfe6eb 100644
--- a/src/main/java/duke/TaskList.java
+++ b/src/main/java/duke/TaskList.java
@@ -59,4 +59,19 @@ public void markTask(int num) {
         Ui.markTask(t);
         this.storage.rewriteFile(tasks);
     }
+
+    /**
+     * Searches Tasks using keyword.
+     *
+     * @param keyword The keyword.
+     */
+    public void searchTask(String keyword) {
+        ArrayList<Task> result = new ArrayList<>();
+        for (int i = 0; i < this.tasks.size(); i++) {
+            if (tasks.get(i).toString().contains(keyword)) {
+                result.add(tasks.get(i));
+            }
+        }
+        Ui.listMatchingTasks(result);
+    }
 }
diff --git a/src/main/java/duke/Ui.java b/src/main/java/duke/Ui.java
index 4e5521399a..e43d10ca9f 100644
--- a/src/main/java/duke/Ui.java
+++ b/src/main/java/duke/Ui.java
@@ -31,7 +31,25 @@ public static void listTasks(ArrayList<Task> tasks) {
         int counter = 0;
         while (counter != tasks.size()) {
             counter++;
-            System.out.println(" " + counter + "." + tasks.get(counter - 1).toString());
+            System.out.println(" " + counter + "."
+                    + tasks.get(counter - 1).toString());
+        }
+        Ui.printSeparationLine();
+    }
+
+    /**
+     * Prints all tasks in task list.
+     *
+     * @param tasks The task list.
+     */
+    public static void listMatchingTasks(ArrayList<Task> tasks) {
+        Ui.printSeparationLine();
+        System.out.println(" Here are the matching tasks in your list:");
+        int counter = 0;
+        while (counter != tasks.size()) {
+            counter++;
+            System.out.println(" " + counter + "."
+                    + tasks.get(counter - 1).toString());
         }
         Ui.printSeparationLine();
     }