Add close command

src/main/java/seedu/address/logic/LogicManager.java

@@ -1,5 +1,7 @@
 package seedu.address.logic;
 
+import static seedu.address.logic.Messages.MESSAGE_COMMAND_CANCELLED;
+
 import java.io.IOException;
 import java.nio.file.AccessDeniedException;
 import java.nio.file.Path;
@@ -33,6 +35,10 @@ public class LogicManager implements Logic {
     private final Storage storage;
     private final AddressBookParser addressBookParser;
 
+    // Boolean to determine if user has confirmed they want to delete command
+    private boolean awaitingConfirmation = false;
+    private Command delayedCommand = null;
+
     /**
      * Constructs a {@code LogicManager} with the given {@code Model} and {@code Storage}.
      */
@@ -47,8 +53,17 @@ public CommandResult execute(String commandText) throws CommandException, ParseE
         logger.info("----------------[USER COMMAND][" + commandText + "]");
 
         CommandResult commandResult;
-        Command command = addressBookParser.parseCommand(commandText);
-        commandResult = command.execute(model);
+        if (this.awaitingConfirmation) {
+            commandResult = handleConfirmation(commandText);
+        } else {
+            Command command = addressBookParser.parseCommand(commandText);
+            commandResult = command.execute(model, this.awaitingConfirmation);
+
+            if (commandResult.isShowConfirmation() && !this.awaitingConfirmation) {
+                this.awaitingConfirmation = true;
+                this.delayedCommand = command;
+            }
+        }
 
         try {
             storage.saveAddressBook(model.getAddressBook());
@@ -61,6 +76,25 @@ public CommandResult execute(String commandText) throws CommandException, ParseE
         return commandResult;
     }
 
+    /**
+     * Processes user input for command confirmation.
+     * Executes the delayed command if confirmed, or cancels it and returns a cancellation message.
+     *
+     * @param commandText The user's confirmation input.
+     * @return The result of the command if confirmed, or a cancellation message.
+     * @throws CommandException If an error occurs during command execution.
+     */
+    private CommandResult handleConfirmation(String commandText) throws CommandException {
+        CommandResult commandResult;
+        if (addressBookParser.parseConfirmation(commandText)) {
+            commandResult = this.delayedCommand.execute(model, this.awaitingConfirmation);
+        } else {
+            commandResult = new CommandResult(MESSAGE_COMMAND_CANCELLED);
+        }
+        this.awaitingConfirmation = false;
+        return commandResult;
+    }
+
     @Override
     public ReadOnlyAddressBook getAddressBook() {
         return model.getAddressBook();

src/main/java/seedu/address/logic/Messages.java

@@ -21,6 +21,9 @@ public class Messages {
 
     public static final String MESSAGE_CONCURRENT_RN_RA_FIELDS = "Both remark new and remark append fields are "
             + "specified, please only use one.";
+
+    public static final String MESSAGE_COMMAND_CANCELLED = "Command has been cancelled.";
+
     /**
      * Returns an error message indicating the duplicate prefixes.
      */

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

@@ -57,7 +57,7 @@ public AddCommand(Person person) {
     }
 
     @Override
-    public CommandResult execute(Model model) throws CommandException {
+    protected CommandResult execute(Model model) throws CommandException {
         requireNonNull(model);
 
         if (model.hasPerson(toAdd)) {

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

@@ -12,12 +12,24 @@ public class ClearCommand extends Command {
 
     public static final String COMMAND_WORD = "clear";
     public static final String MESSAGE_SUCCESS = "Address book has been cleared!";
+    public static final String MESSAGE_CLEAR_CONFIRMATION = "This will permanently clear all contacts. "
+            + "Are you sure you want to execute this command? (y/n)";
 
+    private static final boolean requiresConfirmation = true;
 
     @Override
-    public CommandResult execute(Model model) {
+    protected CommandResult execute(Model model) {
         requireNonNull(model);
         model.setAddressBook(new AddressBook());
         return new CommandResult(MESSAGE_SUCCESS);
     }
+
+    @Override
+    public CommandResult execute(Model model, Boolean confirmationReceived) {
+        if (confirmationReceived.equals(requiresConfirmation)) {
+            return this.execute(model);
+        }
+        return new CommandResult(MESSAGE_CLEAR_CONFIRMATION, false, false, true, null, false);
+    }
+
 }

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

@@ -0,0 +1,36 @@
+package seedu.address.logic.commands;
+
+import static seedu.address.logic.commands.CommandCommons.EMPTY_PERSON;
+
+import seedu.address.model.Model;
+
+/**
+ * Closes the detail view in the address book.
+ */
+public class CloseCommand extends Command {
+
+    public static final String COMMAND_WORD = "close";
+
+    public static final String MESSAGE_SUCCESS = "Detailed view closed.";
+
+    @Override
+    public CommandResult execute(Model model) {
+        return new CommandResult(
+                MESSAGE_SUCCESS,
+                false,
+                false,
+                false,
+                EMPTY_PERSON,
+                false
+        );
+    }
+    @Override
+    public boolean equals(Object obj) {
+        return obj == this || obj instanceof CloseCommand;
+    }
+
+    @Override
+    public String toString() {
+        return COMMAND_WORD;
+    }
+}

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

@@ -8,13 +8,30 @@
  */
 public abstract class Command {
 
+    private static final boolean requiresConfirmation = false;
+
     /**
      * Executes the command and returns the result message.
      *
-     * @param model {@code Model} which the command should operate on.
+     * @param model                {@code Model} which the command should operate on and m
+     * @param confirmationReceived A {@code Boolean} indicating whether user confirmation has been provided,
+     *                             if required for executing the command.
      * @return feedback message of the operation result for display
      * @throws CommandException If an error occurs during command execution.
      */
-    public abstract CommandResult execute(Model model) throws CommandException;
+    public CommandResult execute(Model model, Boolean confirmationReceived) throws CommandException {
+        if (confirmationReceived.equals(requiresConfirmation)) {
+            return this.execute(model);
+        }
+        return null;
+    }
 
+    /**
+     * Executes the command and returns the result message.
+     *
+     * @param model {@code Model} which the command should operate on.
+     * @return feedback message of the operation result for display
+     * @throws CommandException If an error occurs during command execution.
+     */
+    protected abstract CommandResult execute(Model model) throws CommandException;
 }

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

@@ -1,10 +1,13 @@
 package seedu.address.logic.commands;
 
+import seedu.address.model.person.Person;
+
 /**
  * Contains common values used in different command classes, including default command values.
  */
 public final class CommandCommons {
     public static final String DEFAULT_TIER = "";
     public static final String DEFAULT_REMARK = "NA";
+    public static final Person EMPTY_PERSON = null;
 
 }

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

@@ -5,6 +5,7 @@
 import java.util.Objects;
 
 import seedu.address.commons.util.ToStringBuilder;
+import seedu.address.model.person.Person;
 
 /**
  * Represents the result of a command execution.
@@ -19,21 +20,31 @@ public class CommandResult {
     /** The application should exit. */
     private final boolean exit;
 
+    /** The application should show a confirmation button */
+    private final boolean showConfirmation;
+
+    private final boolean showPerson;
+    private final Person viewedPerson;
+
     /**
      * Constructs a {@code CommandResult} with the specified fields.
      */
-    public CommandResult(String feedbackToUser, boolean showHelp, boolean exit) {
+    public CommandResult(String feedbackToUser, boolean showHelp, boolean exit,
+                         boolean showPerson, Person viewedPerson, boolean showConfirmation) {
         this.feedbackToUser = requireNonNull(feedbackToUser);
         this.showHelp = showHelp;
         this.exit = exit;
+        this.showPerson = showPerson;
+        this.viewedPerson = viewedPerson;
+        this.showConfirmation = showConfirmation;
     }
 
     /**
      * Constructs a {@code CommandResult} with the specified {@code feedbackToUser},
      * and other fields set to their default value.
      */
     public CommandResult(String feedbackToUser) {
-        this(feedbackToUser, false, false);
+        this(feedbackToUser, false, false, false, null, false);
     }
 
     public String getFeedbackToUser() {
@@ -48,26 +59,40 @@ public boolean isExit() {
         return exit;
     }
 
+    public boolean isShowPerson() {
+        return showPerson;
+    }
+
+    public Person getViewedPerson() {
+        return viewedPerson;
+    }
+
+    public boolean isShowConfirmation() {
+        return showConfirmation;
+    }
+
     @Override
     public boolean equals(Object other) {
         if (other == this) {
             return true;
         }
 
-        // instanceof handles nulls
         if (!(other instanceof CommandResult)) {
             return false;
         }
 
         CommandResult otherCommandResult = (CommandResult) other;
         return feedbackToUser.equals(otherCommandResult.feedbackToUser)
                 && showHelp == otherCommandResult.showHelp
-                && exit == otherCommandResult.exit;
+                && exit == otherCommandResult.exit
+                && showConfirmation == otherCommandResult.showConfirmation
+                && showPerson == otherCommandResult.showPerson
+                && Objects.equals(viewedPerson, otherCommandResult.viewedPerson);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(feedbackToUser, showHelp, exit);
+        return Objects.hash(feedbackToUser, showHelp, exit, showConfirmation, showPerson, viewedPerson);
     }
 
     @Override

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

@@ -24,6 +24,11 @@ public class DeleteCommand extends Command {
             + "Example: " + COMMAND_WORD + " 1";
 
     public static final String MESSAGE_DELETE_PERSON_SUCCESS = "Deleted Person: %1$s";
+    public static final String MESSAGE_DELETE_CONFIRMATION = "This will permanently delete this contact. "
+            + "Are you sure you want to execute this command? (y/n)";
+
+    private static final boolean requiresConfirmation = true;
+
 
     private final Index targetIndex;
 
@@ -45,6 +50,14 @@ public CommandResult execute(Model model) throws CommandException {
         return new CommandResult(String.format(MESSAGE_DELETE_PERSON_SUCCESS, Messages.format(personToDelete)));
     }
 
+    @Override
+    public CommandResult execute(Model model, Boolean confirmationReceived) throws CommandException {
+        if (confirmationReceived.equals(requiresConfirmation)) {
+            return this.execute(model);
+        }
+        return new CommandResult(MESSAGE_DELETE_CONFIRMATION, false, false, true, null, false);
+    }
+
     @Override
     public boolean equals(Object other) {
         if (other == this) {

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

@@ -13,7 +13,7 @@ public class ExitCommand extends Command {
 
     @Override
     public CommandResult execute(Model model) {
-        return new CommandResult(MESSAGE_EXIT_ACKNOWLEDGEMENT, false, true);
+        return new CommandResult(MESSAGE_EXIT_ACKNOWLEDGEMENT, false, true, false, null, false);
     }
 
 }

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

@@ -31,7 +31,7 @@ public FilterCommand(Predicate<Person> predicate) {
     }
 
     @Override
-    public CommandResult execute(Model model) {
+    protected CommandResult execute(Model model) {
         requireNonNull(model);
         model.updateFilteredPersonList(predicate);
         return new CommandResult(

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

@@ -1,5 +1,7 @@
 package seedu.address.logic.commands;
 
+import static seedu.address.logic.commands.CommandCommons.EMPTY_PERSON;
+
 import seedu.address.model.Model;
 
 /**
@@ -16,6 +18,6 @@ public class HelpCommand extends Command {
 
     @Override
     public CommandResult execute(Model model) {
-        return new CommandResult(SHOWING_HELP_MESSAGE, true, false);
+        return new CommandResult(SHOWING_HELP_MESSAGE, true, false, false, EMPTY_PERSON, false);
     }
 }

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

@@ -16,7 +16,7 @@ public class ListCommand extends Command {
 
 
     @Override
-    public CommandResult execute(Model model) {
+    protected CommandResult execute(Model model) {
         requireNonNull(model);
         model.updateFilteredPersonList(PREDICATE_SHOW_ALL_PERSONS);
         return new CommandResult(MESSAGE_SUCCESS);