Implement EditAssignmentCommand to update submission status of assignments

src/main/java/seedu/address/logic/commands/EditAssignmentCommand.java

@@ -0,0 +1,46 @@
+package seedu.address.logic.commands;
+
+import static java.util.Objects.requireNonNull;
+
+import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.model.Model;
+import seedu.address.model.assignment.Assignment;
+
+/**
+ * Edits the submission status of an existing assignment in the list.
+ */
+public class EditAssignmentCommand extends Command {
+
+    public static final String COMMAND_WORD = "edit_assignment";
+
+    public static final String MESSAGE_SUCCESS = "Successfully updated the submission status of assignment";
+    public static final String MESSAGE_ASSIGNMENT_NOT_FOUND = "There is no such assignment in the list!";
+
+    private final Assignment toEdit;
+
+    /**
+     * Constructs an EditAssignmentCommand to edit the submission status of the specified {@code Assignment}.
+     *
+     * @param assignment The assignment whose submission status is to be edited.
+     */
+    public EditAssignmentCommand(Assignment assignment) {
+        requireNonNull(assignment);
+        toEdit = assignment;
+    }
+
+    /**
+     * Executes the command and updates the submission status of the assignment in the model.
+     *
+     * @param model The model which contains the list of assignments.
+     * @return A CommandResult indicating the success of the operation.
+     * @throws CommandException if the assignment is not found in the model.
+     */
+    public CommandResult execute(Model model) throws CommandException {
+        requireNonNull(model);
+        if (!model.hasAssignment(toEdit)) {
+            throw new CommandException(MESSAGE_ASSIGNMENT_NOT_FOUND);
+        }
+        model.editAssignmentStatus(toEdit);
+        return new CommandResult(MESSAGE_SUCCESS);
+    }
+}

src/main/java/seedu/address/model/AddressBook.java

@@ -127,6 +127,10 @@ public void addAssignment(Assignment a) {
         assignments.add(a);
     }
 
+    public void editAssignmentStatus(Assignment a) {
+        assignments.setSubmitted(a);
+    }
+
     /**
      * Replaces the given Assignment {@code assignment} in the list with {@code editedAssignment}.
      * {@code assignment} must exist in the address book.

src/main/java/seedu/address/model/Model.java

@@ -94,4 +94,6 @@ public interface Model {
      * Returns true if a assignment with the same identity as {@code assignment} exists in the app.
      */
     boolean hasAssignment(Assignment assignment);
+
+    void editAssignmentStatus(Assignment assignment);
 }

src/main/java/seedu/address/model/ModelManager.java

@@ -121,6 +121,10 @@ public void addAssignment(Assignment assignment) {
         //will probably need to make some changes to keep track of duplicate assignments
     }
 
+    public void editAssignmentStatus(Assignment assignment) {
+        addressBook.editAssignmentStatus(assignment);
+    }
+
     //=========== Filtered Student List Accessors =============================================================
 
     /**

src/main/java/seedu/address/model/assignment/Assignment.java

@@ -115,4 +115,8 @@ public int getScore() {
         return this.score;
     }
 
+    public void setHasSubmitted() {
+        this.hasSubmitted = true;
+    }
+
 }

src/main/java/seedu/address/model/assignment/UniqueAssignmentList.java

@@ -145,5 +145,12 @@ private boolean assignmentsAreUnique(List<Assignment> assignments) {
         }
         return true;
     }
+
+    public void setSubmitted(Assignment assignment) {
+        int index = internalList.indexOf(assignment);
+        assignment.setHasSubmitted();
+        internalList.set(index, assignment);
+        // what if assignment does not exist in the list?
+    }
 }