import org.springframework.util.LinkedMultiValueMap;
import org.springframework.web.client.RestTemplate;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.MultiValueMap;
import org.springframework.http.converter.FormHttpMessageConverter;

class EncryptionExample {
    public static void main(String[] args) {
        try {
            // ===================== 1. Prepare business parameters =====================
            Map<String, Object> requestParams = new HashMap<>();
            requestParams.put("tenantUserId", "tenant_001");
            requestParams.put("chainName", "ETH");
            requestParams.put("symbol", "USDT");

            // ===================== 2. JSON serialization =====================
            // Perform serialization using JSON utility class, implementation can refer to sample code in relevant utility classes
            String jsonData = JsonUtils.toJson(requestParams);

            // ===================== 3. RSA public key encryption =====================
            // Use the public key provided by WaaS
            String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQ...";

            // Use RSA utility class for encryption, implementation can refer to sample code in relevant utility classes
            byte[] encryptedData = RSAUtils.encryptByPublicKey(
                jsonData.getBytes(),
                publicKey
            );

            // ===================== 4. Base64 encoding =====================
            // Perform encoding using Base64 utility class, implementation can refer to sample code in relevant utility classes
            String base64Data = Base64Util.encodeByte(encryptedData);

            // ===================== 5. Prepare HTTP request =====================
            // Create HTTP request headers
            HttpHeaders headers = new HttpHeaders();
            headers.add("X-API-KEY", "MERCHANT_123456"); // Merchant credentials
            headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED); // Form format

            // Package request body
            MultiValueMap<String, String> body = new LinkedMultiValueMap<>();
            body.add("data", base64Data); // Parameter name must be "data"

            // ===================== 6. Send API request =====================
            // Create and configure RestTemplate
            RestTemplate restTemplate = new RestTemplate();
            restTemplate.getMessageConverters().add(new FormHttpMessageConverter());

            // Send request and get response
            APIResult response = restTemplate.postForObject(
                "https://waas2-out-api.powersafe-rel.cc/api/v1/api/user/getUserAddress",
                new HttpEntity<>(body, headers),
                APIResult.class
            );

            // Process response, content can refer to response examples
            System.out.println("\nAPI response result:");
            System.out.println(response);

        } catch (Exception e) {
            System.err.println("\nError occurred during processing: " + e.getMessage());
            e.printStackTrace();
        }
    }
}