From 52505dc72ed649cfbc7be9ecb3503e2c6e9444ef Mon Sep 17 00:00:00 2001
From: Sampy147 <samuelpangc@gmail.com>
Date: Mon, 12 Sep 2022 18:22:54 +0800
Subject: [PATCH] Add Level-9 find feature

Added the find feature which allows user to find matching tasks using a
keyword
---
 src/main/java/duke/Message.java             |  1 +
 src/main/java/duke/command/FindCommand.java | 27 +++++++++++++++++++++
 src/main/java/duke/parser/Parser.java       | 13 +++++++++-
 src/main/java/duke/task/Task.java           |  4 +++
 src/main/java/duke/task/TaskList.java       | 20 +++++++++++++++
 src/main/java/duke/ui/Ui.java               |  4 +++
 6 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/duke/command/FindCommand.java

diff --git a/src/main/java/duke/Message.java b/src/main/java/duke/Message.java
index c2c6a1392f..882f109197 100644
--- a/src/main/java/duke/Message.java
+++ b/src/main/java/duke/Message.java
@@ -19,6 +19,7 @@ public class Message {
     public static final String FILE_NOT_FOUND = "The memory file cannot be found.";
     public static final String FILE_READ_ERROR = "There is an error when reading the memory file.";
     public static final String FILE_CREATE_ERROR = "There is an error when creating the memory file";
+    public static final String INVALID_FIND_TASK_FORMAT = "To find a task, please input this format: find {Keyword}";
 
     public static String returnTaskNotFound(TaskList tasks) {
         return "Task does not exist. Try another number between 1 and " + tasks.getCount();
diff --git a/src/main/java/duke/command/FindCommand.java b/src/main/java/duke/command/FindCommand.java
new file mode 100644
index 0000000000..17521b236a
--- /dev/null
+++ b/src/main/java/duke/command/FindCommand.java
@@ -0,0 +1,27 @@
+package duke.command;
+
+import duke.DukeException;
+import duke.storage.Storage;
+import duke.task.TaskList;
+import duke.ui.Ui;
+
+public class FindCommand extends Command {
+
+    private String keyword;
+
+    public FindCommand(String keyword) {
+        this.keyword = keyword;
+    }
+
+    @Override
+    public boolean isExit() {
+        return false;
+    }
+
+    @Override
+    public void execute(TaskList tasks, Ui ui, Storage storage) throws DukeException {
+        String foundTasks = tasks.findTasks(this.keyword);
+        ui.showFound(foundTasks);
+    }
+
+}
diff --git a/src/main/java/duke/parser/Parser.java b/src/main/java/duke/parser/Parser.java
index 85e0952adb..1de5564f0f 100644
--- a/src/main/java/duke/parser/Parser.java
+++ b/src/main/java/duke/parser/Parser.java
@@ -28,8 +28,10 @@ public static Command parse(String fullCommand) throws DukeException {
             return addEvent(fullCommand);
         } else if (command.equals("todo")) {
             return addToDo(fullCommand);
-        } else if (command.equals("delete")){
+        } else if (command.equals("delete")) {
             return deleteTask(fullCommand);
+        } else if (command.equals("find")) {
+            return findTask(fullCommand);
         }
         throw new DukeException(Message.INVALID_USER_INPUT);
     }
@@ -108,4 +110,13 @@ private static DeleteCommand deleteTask(String command) throws DukeException {
         }
     }
 
+    private static FindCommand findTask(String command) throws DukeException {
+        String[] commandList = command.strip().split(" ");
+        try {
+            return new FindCommand(commandList[1]);
+        } catch (IndexOutOfBoundsException e) {
+            throw new DukeException(Message.INVALID_FIND_TASK_FORMAT);
+        }
+    }
+
 }
diff --git a/src/main/java/duke/task/Task.java b/src/main/java/duke/task/Task.java
index 9561bad442..d2dd9419a5 100644
--- a/src/main/java/duke/task/Task.java
+++ b/src/main/java/duke/task/Task.java
@@ -21,6 +21,10 @@ public void unmark() {
         this.isDone = false;
     }
 
+    public String getDescription() {
+        return this.description;
+    }
+
     @Override
     public String toString() {
         return "[" + getStatusIcon() + "] " + this.description;
diff --git a/src/main/java/duke/task/TaskList.java b/src/main/java/duke/task/TaskList.java
index 9d2a797edc..ae1a1cd6c5 100644
--- a/src/main/java/duke/task/TaskList.java
+++ b/src/main/java/duke/task/TaskList.java
@@ -51,6 +51,26 @@ public Task deleteTaskAtPos(int position) throws IndexOutOfBoundsException {
         return deletedTask;
     }
 
+    public String findTasks(String keyword) {
+        String foundTasks = "";
+        int taskCount = 1;
+        for (Task task : this.taskArray) {
+            String description = task.getDescription();
+            String[] words = description.split(" ");
+            for (String word : words) {
+                if (word.equals(keyword)) {
+                    if (taskCount == 1) {
+                         foundTasks += taskCount + ". " + task;
+                    } else {
+                        foundTasks += "\n" + taskCount + ". " + task;
+                    }
+                    taskCount++;
+                }
+            }
+        }
+        return foundTasks;
+    }
+
     public String toSimpleStrings() {
         String stringedList = "";
         for (int i = 0; i < this.count; i++) {
diff --git a/src/main/java/duke/ui/Ui.java b/src/main/java/duke/ui/Ui.java
index 6a571a2a57..d578119042 100644
--- a/src/main/java/duke/ui/Ui.java
+++ b/src/main/java/duke/ui/Ui.java
@@ -61,4 +61,8 @@ public void showDeleted(Task task) {
         showFullMessage("Noted. I've removed this task:\n" + task + "\nNow you have " + this.tasks.getCount() + " tasks in the list.");
     }
 
+    public void showFound(String foundTasks) {
+        showFullMessage("Here are the matching tasks in your list:\n" + foundTasks);
+    }
+
 }