Add additional checks for error handling

data/dude.txt

@@ -2,7 +2,6 @@ T | 0 |  eat
 T | 1 |  sleep
 T | 0 |  have fun
 T | 0 |  forensic lecture
-D | 0 |  ip | 2023-09-22T23:59
 N | the food at deck is nubbad
 N | i needa study harder
 N | gotta refactor this later

src/main/java/dude/Parser.java

@@ -35,41 +35,77 @@ public static Command parse(String fullCommand) {
             c = new UnmarkCommand(taskIndex);
         } else if (commandType.equals("delete")) {
             String[] details = commandDetails[1].split(" ");
-            String itemType = details[0];
             int index = Integer.parseInt(details[1]) - 1;
-            if (itemType.equals("/t")) {
+
+            if (fullCommand.matches("(.+)/t(.+)")) {
                 c = new DeleteTaskCommand(index);
-            } else if (itemType.equals("/n")) {
+            } else if (fullCommand.matches("(.+)/n(.+)")) {
                 c = new DeleteNoteCommand(index);
             } else {
                 c = new UnknownCommand(fullCommand);
             }
+
         } else if (commandType.equals("todo")) {
+
+            if (commandDetails.length == 1) {
+                return new UnknownCommand(fullCommand); // error
+                // System.out.println("OOPS!!! The description of a todo cannot be empty.");
+            }
+
             String taskDescription = commandDetails[1].trim();
             c = new AddToDoCommand(taskDescription);
-            // if (userInputDetails.length > 1)
-            // System.out.println("OOPS!!! The description of a todo cannot be empty.");
+
         } else if (commandType.equals("deadline")) {
+
+            if (commandDetails.length == 1) {
+                return new UnknownCommand(fullCommand); // error
+                // System.out.println("OOPS!!! The description of a deadline cannot be empty.");
+            } else if (!fullCommand.matches("(.+)/by(.+)")) {
+                return new UnknownCommand(fullCommand);
+                // wrong format
+            }
+
             String[] taskDetails = commandDetails[1].split("\\s/by\\s");
             String taskDescription = taskDetails[0].trim();
             LocalDateTime byDateTime = LocalDateTime.parse(taskDetails[1].trim(), DATETIME_FORMATTER);
             c = new AddDeadlineCommand(taskDescription, byDateTime);
-            // if (userInputDetails.length == 1) {
-            // System.out.println("OOPS!!! The description of a deadline cannot be empty.");
+
         } else if (commandType.equals("event")) {
+
+            if (commandDetails.length == 1) {
+                return new UnknownCommand(fullCommand); // error
+                // System.out.println("OOPS!!! The description of an event cannot be empty.");
+            } else if (!fullCommand.matches("(.+)/from(.+)/to(.+)")) {
+                return new UnknownCommand(fullCommand);
+                // wrong format
+            }
+
             String[] taskDetails = commandDetails[1].split("\\s/from\\s|\\s/to\\s");
             String taskDescription = taskDetails[0].trim();
             LocalDateTime fromDateTime = LocalDateTime.parse(taskDetails[1].trim(), DATETIME_FORMATTER);
             LocalDateTime toDateTime = LocalDateTime.parse(taskDetails[2].trim(), DATETIME_FORMATTER);
             c = new AddEventCommand(taskDescription, fromDateTime, toDateTime);
-            // if (userInputDetails.length == 1) {
-            // System.out.println("OOPS!!! The description of an event cannot be empty.");
+
         } else if (commandType.equals("note")) {
+
+            if (commandDetails.length == 1) {
+                return new UnknownCommand(fullCommand); // error
+                // System.out.println("OOPS!!! The description of a note cannot be empty.");
+            }
+
             String noteDescription = commandDetails[1].trim();
             c = new AddNoteCommand(noteDescription);
+
         } else if (commandType.equals("find")) {
+
+            if (commandDetails.length == 1) {
+                return new UnknownCommand(fullCommand); // error
+                // System.out.println("OOPS!!! The description of a find cannot be empty.");
+            }
+
             String searchKeywords = commandDetails[1].trim();
             c = new FindCommand(searchKeywords);
+
         } else {
             c = new UnknownCommand(fullCommand);
         }