finished

src/app/Main.java

@@ -2,6 +2,7 @@
 
 import data_access.FileUserDataAccessObject;
 import entity.CommonUserFactory;
+import interface_adapter.clear_users.ClearViewModel;
 import interface_adapter.login.LoginViewModel;
 import interface_adapter.logged_in.LoggedInViewModel;
 import interface_adapter.signup.SignupViewModel;
@@ -43,14 +44,18 @@ public static void main(String[] args) {
         LoggedInViewModel loggedInViewModel = new LoggedInViewModel();
         SignupViewModel signupViewModel = new SignupViewModel();
 
+        // add clearViewModel
+        ClearViewModel clearViewModel = new ClearViewModel();
+
         FileUserDataAccessObject userDataAccessObject;
         try {
             userDataAccessObject = new FileUserDataAccessObject("./users.csv", new CommonUserFactory());
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
 
-        SignupView signupView = SignupUseCaseFactory.create(viewManagerModel, loginViewModel, signupViewModel, userDataAccessObject);
+        // add clearViewModel and userDataAccessObject
+        SignupView signupView = SignupUseCaseFactory.create(viewManagerModel, loginViewModel, signupViewModel, userDataAccessObject, clearViewModel, userDataAccessObject);
         views.add(signupView, signupView.viewName);
 
         LoginView loginView = LoginUseCaseFactory.create(viewManagerModel, loginViewModel, loggedInViewModel, userDataAccessObject);

src/app/SignupUseCaseFactory.java

@@ -1,9 +1,16 @@
 package app;
 
+import interface_adapter.clear_users.ClearController;
+import interface_adapter.clear_users.ClearPresenter;
+import interface_adapter.clear_users.ClearViewModel;
 import interface_adapter.login.LoginViewModel;
 import interface_adapter.signup.SignupController;
 import interface_adapter.signup.SignupPresenter;
 import interface_adapter.signup.SignupViewModel;
+import use_case.clear_users.ClearInputBoundary;
+import use_case.clear_users.ClearInteractor;
+import use_case.clear_users.ClearOutputBoundary;
+import use_case.clear_users.ClearUserDataAccessInterface;
 import use_case.signup.SignupUserDataAccessInterface;
 import entity.CommonUserFactory;
 import entity.UserFactory;
@@ -22,15 +29,17 @@ public class SignupUseCaseFactory {
     private SignupUseCaseFactory() {}
 
     public static SignupView create(
-            ViewManagerModel viewManagerModel, LoginViewModel loginViewModel, SignupViewModel signupViewModel, SignupUserDataAccessInterface userDataAccessObject) {
+            ViewManagerModel viewManagerModel, LoginViewModel loginViewModel, SignupViewModel signupViewModel, SignupUserDataAccessInterface userDataAccessObject, ClearViewModel clearViewModel, ClearUserDataAccessInterface clearUserDataAccessObject) {
 
         try {
             SignupController signupController = createUserSignupUseCase(viewManagerModel, signupViewModel, loginViewModel, userDataAccessObject);
-            return new SignupView(signupController, signupViewModel);
+            ClearController clearController = createUserClearUseCase(viewManagerModel, clearViewModel, clearUserDataAccessObject);
+            return new SignupView(signupController, signupViewModel, clearController, clearViewModel);
         } catch (IOException e) {
             JOptionPane.showMessageDialog(null, "Could not open user data file.");
         }
 
+
         return null;
     }
 
@@ -46,4 +55,16 @@ private static SignupController createUserSignupUseCase(ViewManagerModel viewMan
 
         return new SignupController(userSignupInteractor);
     }
+
+    private static ClearController createUserClearUseCase(ViewManagerModel viewManagerModel, ClearViewModel clearViewModel, ClearUserDataAccessInterface userDataAccessObject) throws IOException {
+
+        // Notice how we pass this method's parameters to the Presenter.
+        ClearOutputBoundary clearOutputBoundary = new ClearPresenter(viewManagerModel, clearViewModel);
+
+        // no UserFactorty
+        ClearInputBoundary clearInteractor = new ClearInteractor(
+                userDataAccessObject, clearOutputBoundary);
+
+        return new ClearController(clearInteractor);
+    }
 }

src/data_access/FileUserDataAccessObject.java

@@ -2,16 +2,18 @@
 
 import entity.User;
 import entity.UserFactory;
+import use_case.clear_users.ClearUserDataAccessInterface;
 import use_case.login.LoginUserDataAccessInterface;
 import use_case.signup.SignupUserDataAccessInterface;
 
 import java.io.*;
 import java.time.LocalDateTime;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-public class FileUserDataAccessObject implements SignupUserDataAccessInterface, LoginUserDataAccessInterface {
+public class FileUserDataAccessObject implements SignupUserDataAccessInterface, LoginUserDataAccessInterface, ClearUserDataAccessInterface {
 
     private final File csvFile;
 
@@ -85,6 +87,30 @@ private void save() {
         }
     }
 
+    @Override
+    public String delete() {
+        StringBuilder deleted = new StringBuilder();
+        ArrayList<String> accountsToDelete = new ArrayList<>(accounts.keySet());
+
+        for (String account : accountsToDelete) {
+            accounts.remove(account);
+            //  start a new line after each user
+            deleted.append(account).append("\n");
+        }
+
+        BufferedWriter writer;
+        try {
+            writer = new BufferedWriter(new FileWriter(csvFile));
+            writer.flush();
+
+            writer.close();
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return deleted.toString();
+    }
+
 
     /**
      * Return whether a user exists with username identifier.

src/interface_adapter/clear_users/ClearController.java

@@ -1,5 +1,15 @@
 package interface_adapter.clear_users;
 
-// TODO Complete me
+import use_case.clear_users.ClearInputBoundary;
+
 public class ClearController {
+    final ClearInputBoundary clearUseCaseInteractor;
+
+    public ClearController(ClearInputBoundary clearUseCaseInteractor) {
+        this.clearUseCaseInteractor = clearUseCaseInteractor;
+    }
+
+    public void execute() {
+        clearUseCaseInteractor.execute();
+    }
 }

src/interface_adapter/clear_users/ClearPresenter.java

@@ -1,6 +1,35 @@
 package interface_adapter.clear_users;
 
-// TODO Complete me
 
-public class ClearPresenter {
+import interface_adapter.ViewManagerModel;
+import use_case.clear_users.ClearOutputBoundary;
+import use_case.clear_users.ClearOutputData;
+
+public class ClearPresenter implements ClearOutputBoundary {
+    private final ClearViewModel clearViewModel;
+    private ViewManagerModel viewManagerModel;
+
+    public ClearPresenter(ViewManagerModel viewManagerModel,
+                          ClearViewModel clearViewModel) {
+        this.viewManagerModel = viewManagerModel;
+        this.clearViewModel = clearViewModel;
+    }
+
+    @Override
+    public void prepareSuccessView(ClearOutputData users) {
+        ClearState clearState = clearViewModel.getState();
+        clearState.setClear(users.getUsernames());
+        this.clearViewModel.setState(clearState);
+        this.clearViewModel.firePropertyChanged();
+
+        this.viewManagerModel.setActiveView(clearViewModel.getViewName());
+        this.viewManagerModel.firePropertyChanged();
+    }
+
+    @Override
+    public void prepareFailView(String error) {
+        ClearState clearState = clearViewModel.getState();
+        clearState.setClearError(error);
+        clearViewModel.firePropertyChanged();
+    }
 }

src/interface_adapter/clear_users/ClearState.java

@@ -1,6 +1,30 @@
 package interface_adapter.clear_users;
 
-// TODO Complete me
 
 public class ClearState {
+    private String clear = null;
+    private String clearError = null;
+
+    public ClearState(ClearState copy) {
+        clear = copy.clear;
+        clearError = copy.clearError;
+    }
+
+    public ClearState() {}
+
+    public String getClear() {
+        return clear;
+    }
+
+    public String getClearError() {
+        return clearError;
+    }
+
+    public void setClear(String clear) {
+        this.clear = clear;
+    }
+
+    public void setClearError(String clearError) {
+        this.clearError = clearError;
+    }
 }

src/interface_adapter/clear_users/ClearViewModel.java

@@ -1,6 +1,30 @@
 package interface_adapter.clear_users;
 
-// TODO Complete me
+import interface_adapter.ViewModel;
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
 
-public class ClearViewModel {
+public class ClearViewModel extends ViewModel{
+    private ClearState state = new ClearState();
+    public ClearViewModel() {
+        super("clear");
+    }
+
+    public void setState(ClearState state) {
+        this.state = state;
+    }
+    private final PropertyChangeSupport support = new PropertyChangeSupport(this);
+
+
+    public void firePropertyChanged() {
+        support.firePropertyChange("clear", null, this.state);
+    }
+
+    public void addPropertyChangeListener(PropertyChangeListener listener) {
+        support.addPropertyChangeListener(listener);
+    }
+
+    public ClearState getState() {
+        return state;
+    }
 }

src/use_case/clear_users/ClearInputBoundary.java

@@ -1,6 +1,7 @@
 package use_case.clear_users;
 
-// TODO Complete me
+// Complete me
 
 public interface ClearInputBoundary {
+    void execute();
 }

src/use_case/clear_users/ClearInputData.java

@@ -1,6 +1,6 @@
 package use_case.clear_users;
 
-// TODO Complete me
 
 public class ClearInputData {
+ // no input
 }

src/use_case/clear_users/ClearInteractor.java

@@ -1,6 +1,19 @@
 package use_case.clear_users;
 
-// TODO Complete me
 
-public class ClearInteractor {
+public class ClearInteractor implements ClearInputBoundary{
+    final ClearUserDataAccessInterface userDataAccessObject;
+    final ClearOutputBoundary clearPresenter;
+
+    public ClearInteractor(ClearUserDataAccessInterface userDataAccessInterface, ClearOutputBoundary clearOutputBoundary) {
+        this.userDataAccessObject = userDataAccessInterface;
+        this.clearPresenter = clearOutputBoundary;
+    }
+
+    @Override
+    public void execute() {
+        String usernames = userDataAccessObject.delete();
+        ClearOutputData clearOutputData = new ClearOutputData(usernames, false);
+        clearPresenter.prepareSuccessView(clearOutputData);
+    }
 }

src/use_case/clear_users/ClearOutputBoundary.java

@@ -1,6 +1,7 @@
 package use_case.clear_users;
 
-// TODO Complete me
-
 public interface ClearOutputBoundary {
+
+    void prepareSuccessView(ClearOutputData user);
+    void prepareFailView(String error);
 }

src/use_case/clear_users/ClearOutputData.java

@@ -1,6 +1,12 @@
 package use_case.clear_users;
+public class ClearOutputData {
+    private final String usernames;
+    private boolean useCaseFailed;
 
-// TODO Complete me
+    public ClearOutputData(String usernames, boolean useCaseFailed) {
+        this.usernames = usernames;
+        this.useCaseFailed = useCaseFailed;
+    }
 
-public class ClearOutputData {
+    public String getUsernames() { return usernames; }
 }

src/use_case/clear_users/ClearUserDataAccessInterface.java

@@ -1,6 +1,5 @@
 package use_case.clear_users;
 
-// TODO Complete me
-
 public interface ClearUserDataAccessInterface {
+    String delete();
 }