/*
    * 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 java.lang.reflect.Method;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * The Class ByteBuddyBeanCopier.
   */
  public final class ByteBuddyBeanCopier {
  
      /**
       * Instantiates a new byte buddy bean copier.
       */
      private ByteBuddyBeanCopier() {
          throw new AssertionError("Utility class should not be instantiated");
      }
  
      /**
       * Copy.
       *
       * @param source
       *            the source
       * @param target
       *            the target
       * @param converter
       *            the converter
       */
      public static void copy(Object source, Object target, BooleanConverter converter) {
          if (source == null || target == null) {
              return;
          }
  
          Class<?> clazz = source.getClass();
          Map<String, Method> getters = new HashMap<>();
          Map<String, Method> setters = new HashMap<>();
  
          for (Method method : clazz.getMethods()) {
              if (ByteBuddyBeanCopier.isGetter(method)) {
                  String property = ByteBuddyBeanCopier.decapitalize(ByteBuddyBeanCopier.extractPropertyName(method));
                  getters.put(property, method);
              } else if (ByteBuddyBeanCopier.isSetter(method)) {
                  String property = ByteBuddyBeanCopier.decapitalize(method.getName().substring(3));
                  setters.put(property, method);
              }
          }
  
          for (Map.Entry<String, Method> entry : setters.entrySet()) {
              String property = entry.getKey();
              Method setter = entry.getValue();
              Method getter = getters.get(property);
  
              try {
                  Object value = null;
                  if (getter != null) {
                      value = getter.invoke(source);
                  } else if (isBooleanType(setter.getParameterTypes()[0])) {
                      // Try 'is' method for Boolean if getter is missing
                      String isMethodName = "is" + ByteBuddyBeanCopier.capitalize(property);
                      try {
                          Method isMethod = clazz.getMethod(isMethodName);
                          if (isBooleanType(isMethod.getReturnType())) {
                              value = isMethod.invoke(source);
                          }
                      } catch (NoSuchMethodException ignored) {
                          // No 'is' method, skip
                      }
                  }
                  if (converter != null && isBooleanType(setter.getParameterTypes()[0])) {
                      value = converter.convert(value, setter.getParameterTypes()[0]);
                  }
                  if (value != null || !setter.getParameterTypes()[0].isPrimitive()) {
                      setter.invoke(target, value);
                  }
              } catch (Exception e) {
                  throw new RuntimeException("Failed to copy property: " + property, e);
              }
          }
      }
  
      /**
       * Checks if is getter.
       *
       * @param method
       *            the method
       * @return true, if is getter
       */
      private static boolean isGetter(Method method) {
          if (method.getParameterCount() != 0) {
              return false;
          }
         String name = method.getName();
         return name.startsWith("get") && !method.getReturnType().equals(void.class) && name.length() > 3
                 || name.startsWith("is") && isBooleanType(method.getReturnType()) && name.length() > 2;
     }
 
     /**
      * Checks if is setter.
      *
      * @param method
      *            the method
      * @return true, if is setter
      */
     private static boolean isSetter(Method method) {
         return method.getName().startsWith("set") && method.getParameterCount() == 1
                 && method.getReturnType().equals(void.class);
     }
 
     /**
      * Checks if is boolean type.
      *
      * @param type
      *            the type
      * @return true, if is boolean type
      */
     private static boolean isBooleanType(Class<?> type) {
         return type == boolean.class || type == Boolean.class;
     }
 
     /**
      * Extract property name.
      *
      * @param getter
      *            the getter
      * @return the string
      */
     private static String extractPropertyName(Method getter) {
         String name = getter.getName();
         if (name.startsWith("get")) {
             return name.substring(3);
         }
         if (name.startsWith("is")) {
             return name.substring(2);
         }
         throw new IllegalArgumentException("Not a getter method: " + name);
     }
 
     /**
      * Decapitalize.
      *
      * @param name
      *            the name
      * @return the string
      */
     private static String decapitalize(String name) {
         if (name == null || name.isEmpty()) {
             return name;
         }
         if (name.length() > 1 && Character.isUpperCase(name.charAt(1)) && Character.isUpperCase(name.charAt(0))) {
             return name;
         }
         return Character.toLowerCase(name.charAt(0)) + name.substring(1);
     }
 
     /**
      * Capitalize.
      *
      * @param name
      *            the name
      * @return the string
      */
     private static String capitalize(String name) {
         if (name == null || name.isEmpty()) {
             return name;
         }
         return Character.toUpperCase(name.charAt(0)) + name.substring(1);
     }
 
     /**
      * The Interface BooleanConverter.
      */
     public interface BooleanConverter {
 
         /**
          * Convert.
          *
          * @param value
          *            the value
          * @param targetType
          *            the target type
          * @return the object
          */
         Object convert(Object value, Class<?> targetType);
     }
 
 }