public interface Geocoder {
    GeoCodeResult geocode(String city) throws Exception;
}

public record GeoCodeResult(double latitude, double longitude) {}

public interface TimeZoneService {
    Optional getTimeZoneFromLocation(double latitude, double longitude) throws Exception;
}
public record TimeZone(
        String id,
        String name,
        int rawOffset,
        int dstSavings
) {}

@Bean
CommandLineRunner runner(final ChatClient.Builder chatClientBuilder, List toolCallbacks) {

   final ChatClient agent = chatClientBuilder.build();

   return args -> {
      try (Scanner scanner = new Scanner(System.in)) {
         while (true) {
            System.out.print("\n\nEnter city (or type 'exit' to quit): ");
            String city = scanner.nextLine();
            if ("exit".equalsIgnoreCase(city)) {
               break;
            }

            String queryTemplate = """
                    Please use the available tools to find the latitude and longitude for the city `{city}`. Once you have this information, 
                    use the tools to determine and provide all the timezone details for that location in the same language.
                    """;

            String systemTemplate = """
                    You are an AI assistant specialized in providing geographical information. Your task is to use the provided tools to gather and deliver accurate data.
                    """;

            String llmResponse = agent
                    .prompt()
                    .advisors(new SimpleLoggerAdvisor())
                    .system(systemSpec -> systemSpec.text(systemTemplate))
                    .user(userSpec -> userSpec.text(queryTemplate).param("city", city))
                    .tools(toolCallbacks)
                    .call()
                    .content();

            log.info("\n\n{}", llmResponse);
         }
      }
   };
}

cd geocoder
    mvn spring-boot:run

cd timezone
    mvn spring-boot:run

cd mcp-host
    mvn spring-boot:run