/*
    * SPDX-License-Identifier: Apache-2.0
    * See LICENSE file for details.
    *
    * Copyright 2012-2026 hazendaz
    *
    * Portions of initial baseline code (getter/setter test) by Rob Dawson (CodeBox)
    */
   package com.codebox.bean;
  
  import com.codebox.util.LombokBuilderUtil;
  
  import java.lang.reflect.Modifier;
  
  import net.bytebuddy.ByteBuddy;
  import net.bytebuddy.NamingStrategy;
  import net.bytebuddy.description.NamedElement;
  import net.bytebuddy.description.modifier.Visibility;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
  import net.bytebuddy.implementation.HashCodeMethod;
  import net.bytebuddy.implementation.MethodDelegation;
  import net.bytebuddy.implementation.ToStringMethod;
  import net.bytebuddy.implementation.bind.annotation.Argument;
  import net.bytebuddy.implementation.bind.annotation.This;
  import net.bytebuddy.matcher.ElementMatchers;
  
  /**
   * This helper class can be used to unit test the get/set/equals/canEqual/toString/hashCode methods of JavaBean-style
   * Value Objects.
   */
  public enum JavaBeanTester {
  
      // Private Usage
      ;
  
      /**
       * Configure JavaBeanTester using Fluent API.
       *
       * @param <T>
       *            the generic type
       * @param clazz
       *            the clazz
       *
       * @return A builder implementing the fluent API to configure JavaBeanTester
       */
      public static <T> JavaBeanTesterBuilder<T, ?> builder(final Class<T> clazz) {
          // If class is final, use Object.class for comparison needs
          if (Modifier.isFinal(clazz.getModifiers())) {
              return new JavaBeanTesterBuilder<>(clazz, Object.class);
          }
  
          // Lombok builder not supported by byte buddy, do not attempt to build extension class
          if (LombokBuilderUtil.getLombokBuilderMethod(clazz) != null) {
              return builder(clazz, null);
          }
  
          // Build extension from class using byte buddy
          Class<? extends T> loaded = new ByteBuddy().with(new NamingStrategy.AbstractBase() {
              @Override
              protected String name(TypeDescription superClass) {
                  return clazz.getPackageName() + ".ByteBuddyExt" + superClass.getSimpleName();
              }
          }).subclass(clazz).method(ElementMatchers.isEquals())
                  .intercept(MethodDelegation.to(InstanceOfEqualsInterceptor.class)).method(ElementMatchers.isHashCode())
                  .intercept(HashCodeMethod.usingSuperClassOffset()).method(ElementMatchers.isToString())
                  .intercept(ToStringMethod.prefixedBySimpleClassName()).method(ElementMatchers.named("canEqual"))
                  .intercept(MethodDelegation.to(CanEqualInterceptor.class))
                  .defineField("javabeanExtension", String.class, Visibility.PACKAGE_PRIVATE).make()
                  .load(clazz.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER).getLoaded();
  
          // Builder with proper extension class
          return builder(clazz, loaded);
      }
  
      /**
       * Configure JavaBeanTester using Fluent API.
       *
       * @param <T>
       *            the generic type
       * @param <E>
       *            the element type
       * @param clazz
       *            the clazz
       * @param extension
       *            the extension
       *
       * @return A builder implementing the fluent API to configure JavaBeanTester
       */
      public static <T, E> JavaBeanTesterBuilder<T, E> builder(final Class<T> clazz, final Class<E> extension) {
          return new JavaBeanTesterBuilder<>(clazz, extension);
      }
  
      /**
       * The Class CanEqualInterceptor.
       */
      public static final class CanEqualInterceptor {
  
          /**
          * Prevents instantiation a new can equal interceptor.
          */
         CanEqualInterceptor() {
             // Private constructor to prevent instantiation
         }
 
         /**
          * Can Equal Interceptor.
          *
          * @param object
          *            The object to check can equals
          * @return boolean of can equals
          */
         public static boolean canEqual(final Object object) {
             return object instanceof NamedElement.WithRuntimeName;
         }
 
     }
 
     /**
      * The Class InstanceOfEqualsInterceptor.
      */
     public static final class InstanceOfEqualsInterceptor {
 
         /**
          * Prevents instantiation a new instance of equals interceptor.
          */
         InstanceOfEqualsInterceptor() {
             // Private constructor to prevent instantiation
         }
 
         /**
          * Equals.
          *
          * @param self
          *            the self
          * @param other
          *            the other
          * @return true, if successful
          */
         public static boolean equals(@This Object self, @Argument(0) Object other) {
             if (self == other) {
                 return true;
             }
             if ((other == null) || (!self.getClass().isInstance(other) && !other.getClass().isInstance(self))) {
                 return false;
             }
             return self.hashCode() == other.hashCode();
         }
     }
 
 }