Implement next send time label

src/main/java/name/nathanmcrae/numbersstation/MainController.java

@@ -9,6 +9,7 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -46,6 +47,8 @@ public class MainController implements Initializable {
     private MainSettings settings;
     private StationSettings selectedStation;
 
+    private StringProperty nextSendTime = new SimpleStringProperty();
+
     private StringProperty selectedStationName = new SimpleStringProperty();
 
     private SimpleBooleanProperty unsavedChanges = new SimpleBooleanProperty();
@@ -53,7 +56,7 @@ public class MainController implements Initializable {
     public StringProperty windowTitle = new SimpleStringProperty("Numbers Station");
 
     @FXML
-    private Label lastRetrievedLabel;
+    private Label nextSendTimeLabel;
 
     @FXML
     private TextArea messageTextArea;
@@ -171,6 +174,9 @@ public class MainController implements Initializable {
     @Override
     public void initialize(URL location, ResourceBundle resources) {
         stationNameField.textProperty().bindBidirectional(selectedStationName);
+        nextSendTimeLabel.textProperty().bind(nextSendTime);
+
+        nextSendTime.set("sup brah");
 
         Result<MainSettings, Exception> result = MainSettings.load();
         if (!result.hasSuccess()) {
@@ -283,6 +289,21 @@ public class MainController implements Initializable {
 
         logger.info("Updating station settings: " + newStationSettings.getName());
 
+        DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss");
+
+        try {
+        nextSendTime.set(newStationSettings.nextSendTime().format(dateFormatter));
+        } catch (StationSettings.StationSettingsException e) {
+            String errMessage = "Failed to calculate next message time";
+            logger.log(Level.SEVERE, errMessage, e);
+            Alert alert = new Alert(Alert.AlertType.ERROR);
+            alert.setTitle("Exception");
+            alert.setHeaderText(null);
+            alert.setContentText(errMessage + ": " + e.getMessage());
+            alert.showAndWait();
+            return;
+        }
+
         selectedStation = newStationSettings;
         selectedStationName.set(newStationSettings.getName());
         settings.setSelectedStationName(selectedStationName.get());

src/main/java/name/nathanmcrae/numbersstation/StationSettings.java

@@ -11,7 +11,9 @@ import java.nio.file.Paths;
 import java.nio.file.SimpleFileVisitor;
 import java.security.SecureRandom;
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.time.LocalTime;
+import java.time.Period;
 import java.util.ArrayList;
 import java.util.logging.Logger;
 import java.util.logging.Level;
@@ -191,6 +193,49 @@ public class StationSettings {
         return messageFormattedBuilder.toString();
     }
 
+    public LocalDateTime nextSendTime() throws StationSettingsException {
+        Period sinceScheduleStart = Period.between(scheduleStartDate , LocalDate.now());
+        // If this period's time has not yet passed, then show that time.
+        // Otherwise, show the next period's time.
+        switch (messagePeriod) {
+            case DAILY:
+                if (LocalTime.now().isBefore(scheduleStartTime)) {
+                    return LocalDate.now().atTime(scheduleStartTime);
+                } else {
+                    return LocalDate.now().plusDays(1).atTime(scheduleStartTime);
+                }
+            case WEEKLY:
+                int weekdayDifference = scheduleStartDate.getDayOfWeek().getValue() - LocalDate.now().getDayOfWeek().getValue();
+                System.out.println("weekdayDifference: " + weekdayDifference);
+                if (weekdayDifference > 0) {
+                    return LocalDate.now().plusDays(weekdayDifference).atTime(scheduleStartTime);
+                 } else if (weekdayDifference == 0){
+                    if (LocalTime.now().isBefore(scheduleStartTime)) {
+                        return LocalDate.now().atTime(scheduleStartTime);
+                    } else {
+                        return LocalDate.now().plusWeeks(1).atTime(scheduleStartTime);
+                    }
+                } else {
+                    return LocalDate.now().plusDays(7 + weekdayDifference).atTime(scheduleStartTime);
+                }
+            case MONTHLY:
+                int monthdayDifference = scheduleStartDate.getDayOfMonth() - LocalDate.now().getDayOfMonth();
+                if (monthdayDifference > 0) {
+                    return LocalDate.now().plusDays(monthdayDifference).atTime(scheduleStartTime);
+                } else if (monthdayDifference == 0) {
+                    if (LocalTime.now().isBefore(scheduleStartTime)) {
+                        return LocalDate.now().atTime(scheduleStartTime);
+                    } else {
+                        return LocalDate.now().plusMonths(1).atTime(scheduleStartTime);
+                    }
+                } else {
+                    return LocalDate.now().plusMonths(1).plusDays(monthdayDifference).atTime(scheduleStartTime);
+                }
+            default:
+                throw new StationSettingsException("Invalid period value: " + messagePeriod);
+        }
+    }
+
     public String getAddress() {
         return address;
     }
@@ -304,4 +349,11 @@ public class StationSettings {
             super(message);
         }
     }
+
+    public static class StationSettingsException extends Exception {
+        public StationSettingsException(String message) {
+            super(message);
+        }
+    }
+
 }

src/main/resources/MainView.fxml

@@ -77,7 +77,7 @@
                         <Font size="14.0" />
                      </font>
                   </Label>
-                  <Label fx:id="lastRetrievedLabel" layoutX="201.0" layoutY="15.0" text="2024-12-25T12:59:47" AnchorPane.leftAnchor="201.0" AnchorPane.topAnchor="15.0">
+                  <Label fx:id="nextSendTimeLabel" layoutX="202.0" layoutY="14.0" text="2024-12-25T12:59:47" AnchorPane.leftAnchor="202.0" AnchorPane.topAnchor="14.0">
                      <font>
                         <Font size="14.0" />
                      </font>