B-Snooze

src/main/java/command/RescheduleCommand.java

@@ -0,0 +1,21 @@
+package command;
+
+import process.DukeException;
+import process.Storage;
+import process.Ui;
+import task.TaskList;
+
+public class RescheduleCommand extends Command{
+    private int index;
+    private String datetime;
+    public RescheduleCommand(int index_, String datetime_) {
+        index = index_;
+        datetime = datetime_;
+    }
+    public String execute(TaskList tasks, Ui ui, Storage storage) throws DukeException {
+        if (this.index >= tasks.size()) throw new DukeException("index error");
+        tasks.rescheduleTask(index, datetime);
+        storage.save(tasks);
+        return ui.showTaskRescheduled(tasks.get(index).toString());
+    }
+}

src/main/java/process/Parser.java

@@ -16,7 +16,7 @@ public class Parser {
      * @throws DukeException if Duke cannot make sense of the input
      */
     public static Command parse(String input) throws DukeException { //input validation
-        ArrayList<String> command_list = new ArrayList<String>(Arrays.asList("bye", "list", "find", "delete", "done", "todo", "deadline", "event"));
+        ArrayList<String> command_list = new ArrayList<String>(Arrays.asList("bye", "list", "find", "delete", "done", "todo", "deadline", "event","reschedule"));
         String operation;
         String date;
         int index =-1;
@@ -66,6 +66,16 @@ public static Command parse(String input) throws DukeException { //input validat
                 return new ExitCommand();
             } else if (operation.equals("list")) {
                 return new ListCommand();
+            } else if (operation.equals("reschedule")) {
+                try {
+                    index = Integer.parseInt(operation_list[1]) - 1;
+                } catch (Exception e) {
+                    throw new DukeException("index error");
+                }
+                int to_index = input.indexOf(" /to ");
+                date = input.substring(to_index + 5).trim();
+                if (to_index < 0 || date.isBlank()) throw new DukeException("datetime");
+                return new RescheduleCommand(index, date);
             }
         }
         throw new DukeException("unknown");

src/main/java/process/Ui.java

@@ -78,6 +78,8 @@ public String showError(String error_msg) {
             out_ =  "You have no tasks in your list";
         } else if (error_msg.equals("empty task")) {
             out_ ="OOPS!!! The description of a task cannot be empty.";
+        } else if (error_msg.equals("reschedule")) {
+            out_ = "OOPS!!! A Todo task cannot be rescheduled";
         }
         else out_ =  ("OOPS!!! " + error_msg);
         System.out.println(out_);
@@ -94,7 +96,7 @@ public String showLoadingError() {
     }
     /**
      * Shows and
-     * @return the given taska as done
+     * @return the given task as done
      * @param task to be displayed as done
      */
     public String showTaskDone(String task) {
@@ -103,6 +105,17 @@ public String showTaskDone(String task) {
         System.out.println(out_);
         return out_;
     }
+    /**
+     * Shows and
+     * @return the given task as rescheduled
+     * @param task to be displayed as rescheduled
+     */
+    public String showTaskRescheduled(String task) {
+//        String out_ = "Nice! I've marked this task as done:\n" + "[✓] " + task;
+        String out_ = "Nice! I've rescheduled this task:\n" + task;
+        System.out.println(out_);
+        return out_;
+    }
     /**
      * Shows and
      * @return the given task as deleted

src/main/java/task/Event.java

@@ -29,7 +29,7 @@ public Event(String description, String at, boolean b) throws DukeException {
             SimpleDateFormat sdf = new SimpleDateFormat("dd/M/yyyy hhmm");
             Date date = sdf.parse(at);
             this.at = date;
-            super.tt = "D";
+            super.tt = "E";
             super.extra = at;
         } catch (ParseException e){
             throw new DukeException("datetime");

src/main/java/task/TaskList.java

@@ -75,7 +75,16 @@ public void deleteTask(int index) {
     public void doneTask(int index) {
         this.get(index).done(true);
     }
-
+    public void rescheduleTask(int index, String datetime) throws DukeException{
+        String description = this.get(index).description;
+        String tasktype = this.get(index).tt;
+        if (tasktype.equals("D")) {
+            this.add(index, new Deadline(description, datetime, false));
+        } else if (tasktype.equals("E")) {
+            this.add(index, new Event(description, datetime, false));
+        } else throw new DukeException("reschedule");
+        this.remove(index + 1);
+    }
     /**
      * Searches for a task with the given keyword
      * @param keyword to be found