initial commit

src/main/java/com/rit/whatsapp/service/WhatsAppMessageService.java

@@ -0,0 +1,68 @@
+package com.rit.whatsapp.service;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Service
+public class WhatsAppMessageService {
+
+    @Value("${whatsapp.api-token}")
+    private String apiToken;
+
+    @Value("${whatsapp.phone-number-id}")
+    private String phoneNumberId;
+
+    private final RestTemplate restTemplate;
+
+    public WhatsAppMessageService() {
+        this.restTemplate = new RestTemplate();
+    }
+
+    public void sendMessage(String toPhoneNumber, String messageText) {
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("messaging_product", "whatsapp");
+        payload.put("to", toPhoneNumber);
+        payload.put("type", "text");
+
+        Map<String, String> textPayload = new HashMap<>();
+        textPayload.put("body", messageText);
+        payload.put("text", textPayload);
+        
+        executePost(payload);
+    }
+
+    public void sendInteractiveMessage(String toPhoneNumber, Map<String, Object> interactiveObject) {
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("messaging_product", "whatsapp");
+        payload.put("to", toPhoneNumber);
+        payload.put("type", "interactive");
+        payload.put("interactive", interactiveObject);
+
+        executePost(payload);
+    }
+
+    private void executePost(Map<String, Object> payload) {
+        String url = "https://graph.facebook.com/v19.0/" + phoneNumberId + "/messages";
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        headers.setBearerAuth(apiToken);
+
+        HttpEntity<Map<String, Object>> request = new HttpEntity<>(payload, headers);
+
+        try {
+            ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);
+            System.out.println("Message sent successfully. Response: " + response.getBody());
+        } catch (Exception e) {
+            System.err.println("Failed to send message: " + e.getMessage());
+        }
+    }
+}