import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ApiClient {
    private static final String BASE_URL = "https://exchangegrid.api.mapwale.com/v1";
    
    public static void main(String[] args) {
        try {
            String result = fetchData();
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    private static String fetchData() throws Exception {
        // Create HTTP client
        HttpClient client = HttpClient.newHttpClient();
        ObjectMapper mapper = new ObjectMapper();
        
        // Build URL
        Map<String, String> params = new HashMap<>();
        params.put("region", "YOUR_REGION");  // Replace with actual region value
        
        StringBuilder urlBuilder = new StringBuilder(BASE_URL);
        ["region"].forEach(param -> 
            urlBuilder.append("/").append(params.get(param))
        );
        
        // Add query parameters
        Map<String, String> queryParams = {"show":"all","list":"USD,INR,JPY,BTC,DOGE"};
        urlBuilder.append("?");
        queryParams.forEach((key, value) -> 
            urlBuilder.append(key).append("=").append(value).append("&")
        );
        
        // Create request
        HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
            .uri(URI.create(urlBuilder.toString()))
            .header("Content-Type", "application/json")
            
        if ("GET".equals("POST") || "GET".equals("PUT")) {
            requestBuilder.method("GET", 
                HttpRequest.BodyPublishers.ofString(
                    mapper.writeValueAsString({})
                )
            );
        } else {
            requestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
        }
        
        // Send request
        HttpResponse<String> response = client.send(
            requestBuilder.build(),
            HttpResponse.BodyHandlers.ofString()
        );
        
        if (response.statusCode() >= 400) {
            throw new RuntimeException("HTTP error! status: " + response.statusCode());
        }
        
        return response.body();
    }
}