Lab3

.gitignore

@@ -1,2 +1,3 @@
 target/
 /.idea/
+.env

pom.xml

@@ -45,6 +45,22 @@
             <artifactId>javafx-fxml</artifactId>
             <version>${javafx.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.github.cdimascio</groupId>
+            <artifactId>dotenv-java</artifactId>
+            <version>3.2.0</version>
+        </dependency>
+        <dependency>
+            <groupId>tools.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>3.0.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.wiremock</groupId>
+            <artifactId>wiremock</artifactId>
+            <version>4.0.0-beta.15</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

src/main/java/com/example/HelloController.java

@@ -1,22 +1,52 @@
 package com.example;
 
+import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.control.Label;
+import javafx.scene.control.ListView;
+import javafx.scene.control.TextField;
 
 /**
  * Controller layer: mediates between the view (FXML) and the model.
  */
 public class HelloController {
 
-    private final HelloModel model = new HelloModel();
+    private final HelloModel model = new HelloModel(new NtfyConnectionImpl());
+
+    public ListView<NtfyMessageDto> messageView;
 
     @FXML
     private Label messageLabel;
 
+    @FXML
+    private TextField inputField;
+
+    @FXML
+    private TextField topicField;
+
     @FXML
     private void initialize() {
         if (messageLabel != null) {
             messageLabel.setText(model.getGreeting());
         }
+
+        inputField.textProperty().bindBidirectional(model.messageToSendProperty());
+
+        topicField.textProperty().bindBidirectional(model.topicProperty());
+
+        messageView.setItems(model.getMessages());
+
+        model.connectToTopic();
+    }
+
+    public void sendMessage(ActionEvent actionEvent) {
+        if (!inputField.getText().trim().isEmpty()) {
+            model.sendMessage();
+            inputField.clear();
+        }
+    }
+
+    public void connectToTopic(ActionEvent actionEvent) {
+        model.connectToTopic();
     }
-}
+}

src/main/java/com/example/HelloFX.java

@@ -12,8 +12,8 @@ public class HelloFX extends Application {
     public void start(Stage stage) throws Exception {
         FXMLLoader fxmlLoader = new FXMLLoader(HelloFX.class.getResource("hello-view.fxml"));
         Parent root = fxmlLoader.load();
-        Scene scene = new Scene(root, 640, 480);
-        stage.setTitle("Hello MVC");
+        Scene scene = new Scene(root, 740, 480);
+        stage.setTitle("JavaFX Chat App \uD83D\uDCAC");
         stage.setScene(scene);
         stage.show();
     }

src/main/java/com/example/HelloModel.java

@@ -1,9 +1,54 @@
 package com.example;
 
+import javafx.application.Platform;
+import javafx.beans.property.SimpleStringProperty;
+import javafx.beans.property.StringProperty;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+
 /**
  * Model layer: encapsulates application data and business logic.
  */
 public class HelloModel {
+
+    private final NtfyConnection connection;
+    private final ObservableList<NtfyMessageDto> messages = FXCollections.observableArrayList();
+    private final StringProperty messageToSend = new SimpleStringProperty();
+    private final StringProperty topic = new SimpleStringProperty("mytopic");
+
+    public HelloModel(NtfyConnection connection) {
+        this.connection = connection;
+        receiveMessage();
+    }
+
+    public ObservableList<NtfyMessageDto> getMessages() {
+        return messages;
+    }
+
+    public StringProperty messageToSendProperty() {
+        return messageToSend;
+    }
+
+    public String getMessageToSend() {
+        return messageToSend.get();
+    }
+
+    public void setMessageToSend(String message) {
+        messageToSend.set(message);
+    }
+
+    public String getTopic() {
+        return topic.get();
+    }
+
+    public StringProperty topicProperty() {
+        return topic;
+    }
+
+    public void setTopic(String topic) {
+        this.topic.set(topic);
+    }
+
     /**
      * Returns a greeting based on the current Java and JavaFX versions.
      */
@@ -12,4 +57,17 @@ public String getGreeting() {
         String javafxVersion = System.getProperty("javafx.version");
         return "Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".";
     }
+
+    public void sendMessage() {
+        connection.send(topic.get(), messageToSend.get());
+    }
+
+    public void connectToTopic() {
+        messages.clear();
+        receiveMessage();
+    }
+
+    public void receiveMessage() {
+        connection.receive(topic.get(), m -> Platform.runLater(() -> messages.add(m)));
+    }
 }

src/main/java/com/example/NtfyConnection.java

@@ -0,0 +1,11 @@
+package com.example;
+
+import java.util.function.Consumer;
+
+public interface NtfyConnection {
+
+    public boolean send(String topic, String message);
+
+    public void receive(String topic, Consumer<NtfyMessageDto> messageHandler);
+
+}

src/main/java/com/example/NtfyConnectionImpl.java

@@ -0,0 +1,75 @@
+package com.example;
+
+import io.github.cdimascio.dotenv.Dotenv;
+import tools.jackson.databind.ObjectMapper;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+
+public class NtfyConnectionImpl implements NtfyConnection {
+
+    private final HttpClient http = HttpClient.newHttpClient();
+    private final String hostName;
+    private final ObjectMapper mapper = new ObjectMapper();
+    private CompletableFuture<Void> receiveTask;
+
+    public NtfyConnectionImpl() {
+        Dotenv dotenv = Dotenv.load();
+        hostName = Objects.requireNonNull(dotenv.get("HOST_NAME"));
+    }
+
+    public NtfyConnectionImpl(String hostName) {
+        this.hostName = hostName;
+    }
+
+    @Override
+    public boolean send(String topic, String message) {
+        HttpRequest httpRequest = HttpRequest.newBuilder()
+                .POST(HttpRequest.BodyPublishers.ofString(message))
+                .header("Cache", "no")
+                .uri(URI.create(hostName + "/" + topic))
+                .build();
+        try {
+            var response = http.send(httpRequest, HttpResponse.BodyHandlers.discarding());
+            return true;
+        } catch (IOException e) {
+            System.out.println("Error sending message");
+        } catch (InterruptedException e) {
+            System.out.println("Interrupted sending message");
+            Thread.currentThread().interrupt();
+        }
+        return false;
+    }
+
+    @Override
+    public synchronized void receive(String topic, Consumer<NtfyMessageDto> messageHandler) {
+        if (receiveTask != null) {
+            receiveTask.cancel(true);
+        }
+        HttpRequest httpRequest = HttpRequest.newBuilder()
+                .GET()
+                .uri(URI.create(hostName + "/" + topic + "/json"))
+                .build();
+
+        receiveTask = http.sendAsync(httpRequest, HttpResponse.BodyHandlers.ofLines())
+                .thenAccept(response -> response.body()
+                        .map(s -> {
+                            try {
+                                return mapper.readValue(s, NtfyMessageDto.class);
+                            } catch (Exception e) {
+                                System.err.println("Failed to parse message: " + e.getMessage());
+                                return null;
+                            }
+                        })
+                        .filter(Objects::nonNull)
+                        .filter(message -> "message".equals(message.event()))
+                        .peek(System.out::println)
+                        .forEach(messageHandler));
+    }
+}

src/main/java/com/example/NtfyMessageDto.java

@@ -0,0 +1,13 @@
+package com.example;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public record NtfyMessageDto(String id, long time, String event, String topic, String message) {
+
+    @Override
+    public String toString() {
+        return message;
+    }
+
+}

src/main/java/module-info.java

@@ -1,6 +1,9 @@
 module hellofx {
     requires javafx.controls;
     requires javafx.fxml;
+    requires io.github.cdimascio.dotenv.java;
+    requires java.net.http;
+    requires tools.jackson.databind;
 
     opens com.example to javafx.fxml;
     exports com.example;

src/main/resources/com/example/hello-view.fxml

@@ -1,9 +1,41 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<?import javafx.scene.layout.StackPane?>
-<?import javafx.scene.control.Label?>
-
-<StackPane xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml" fx:controller="com.example.HelloController">
-    <children>
-        <Label fx:id="messageLabel" text="Hello, JavaFX!" />
-    </children>
-</StackPane>
+
+<?import javafx.geometry.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<VBox alignment="CENTER" spacing="15"
+      xmlns="http://javafx.com/javafx/17.0.12"
+      xmlns:fx="http://javafx.com/fxml/1"
+      fx:controller="com.example.HelloController">
+
+    <padding>
+        <Insets bottom="20" left="20" right="20" top="20" />
+    </padding>
+
+    <Label fx:id="messageLabel"
+           style="-fx-font-size: 20px;"
+           text="JavaFX Chat App 💬" />
+
+    <HBox alignment="CENTER_LEFT"
+          spacing="10">
+        <Label text="Topic:" />
+        <TextField fx:id="topicField"
+                   text="mytopic"
+                   HBox.hgrow="ALWAYS" />
+        <Button text="Connect"
+                onAction="#connectToTopic" />
+    </HBox>
+
+    <HBox spacing="10">
+        <TextField fx:id="inputField"
+                   promptText="Type a message!"
+                   HBox.hgrow="ALWAYS" />
+        <Button text="Send"
+                onAction="#sendMessage" />
+    </HBox>
+
+    <ListView fx:id="messageView"
+              VBox.vgrow="ALWAYS" />
+
+</VBox>