package com.guinetik.hexafun.examples.sysmon;
   
   import com.guinetik.hexafun.HexaApp;
   import com.guinetik.hexafun.hexa.UseCaseHandler;
   
   /**
    * Use case handlers for system monitoring operations.
    *
    * <p>Each handler extends {@link UseCaseHandler} to get port access,
   * then delegates to the {@link MetricsProvider} port for actual data.</p>
   *
   * <h2>Architecture</h2>
   * <pre>
   * [Handler] --uses--> [MetricsProvider port] --impl--> [Mock/Real Provider]
   * </pre>
   */
  public final class SysmonHandlers {
  
      private SysmonHandlers() {}
  
      /**
       * Handler for GET_CPU use case.
       */
      public static class GetCpuHandler extends UseCaseHandler<Void, Double> {
  
          public GetCpuHandler(HexaApp app) {
              super(app);
          }
  
          @Override
          public Double apply(Void input) {
              return port(MetricsProvider.class).getCpuUsage();
          }
      }
  
      /**
       * Handler for GET_MEMORY use case.
       */
      public static class GetMemoryHandler extends UseCaseHandler<Void, Double> {
  
          public GetMemoryHandler(HexaApp app) {
              super(app);
          }
  
          @Override
          public Double apply(Void input) {
              return port(MetricsProvider.class).getMemoryUsage();
          }
      }
  
      /**
       * Handler for GET_DISK use case.
       */
      public static class GetDiskHandler extends UseCaseHandler<Void, Double> {
  
          public GetDiskHandler(HexaApp app) {
              super(app);
          }
  
          @Override
          public Double apply(Void input) {
              return port(MetricsProvider.class).getDiskUsage();
          }
      }
  
      /**
       * Handler for GET_ALL use case.
       *
       * <p>Returns a complete SystemMetrics snapshot.</p>
       */
      public static class GetAllMetricsHandler extends UseCaseHandler<Void, SystemMetrics> {
  
          public GetAllMetricsHandler(HexaApp app) {
              super(app);
          }
  
          @Override
          public SystemMetrics apply(Void input) {
              return port(MetricsProvider.class).getAllMetrics();
          }
      }
  }