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());
        }
    }
}