/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    Licensed under the Apache License, Version 2.0 (the "License");
    *    you may not use this file except in compliance with the License.
    *    You may obtain a copy of the License at
    *
    *       http://www.apache.org/licenses/LICENSE-2.0
    *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  package org.apache.ibatis.reflection.wrapper;
  
  import java.util.List;
  
  import org.apache.ibatis.reflection.ExceptionUtil;
  import org.apache.ibatis.reflection.MetaClass;
  import org.apache.ibatis.reflection.MetaObject;
  import org.apache.ibatis.reflection.ReflectionException;
  import org.apache.ibatis.reflection.SystemMetaObject;
  import org.apache.ibatis.reflection.factory.ObjectFactory;
  import org.apache.ibatis.reflection.invoker.Invoker;
  import org.apache.ibatis.reflection.property.PropertyTokenizer;
  
  /**
   * @author Clinton Begin
   */
  public class BeanWrapper extends BaseWrapper {
  
    private final Object object;
    private final MetaClass metaClass;
  
    public BeanWrapper(MetaObject metaObject, Object object) {
      super(metaObject);
      this.object = object;
      this.metaClass = MetaClass.forClass(object.getClass(), metaObject.getReflectorFactory());
    }
  
    @Override
    public Object get(PropertyTokenizer prop) {
      if (prop.getIndex() != null) {
        Object collection = resolveCollection(prop, object);
        return getCollectionValue(prop, collection);
      } else {
        return getBeanProperty(prop, object);
      }
    }
  
    @Override
    public void set(PropertyTokenizer prop, Object value) {
      if (prop.getIndex() != null) {
        Object collection = resolveCollection(prop, object);
        setCollectionValue(prop, collection, value);
      } else {
        setBeanProperty(prop, object, value);
      }
    }
  
    @Override
    public String findProperty(String name, boolean useCamelCaseMapping) {
      return metaClass.findProperty(name, useCamelCaseMapping);
    }
  
    @Override
    public String[] getGetterNames() {
      return metaClass.getGetterNames();
    }
  
    @Override
    public String[] getSetterNames() {
      return metaClass.getSetterNames();
    }
  
    @Override
    public Class<?> getSetterType(String name) {
      PropertyTokenizer prop = new PropertyTokenizer(name);
      if (prop.hasNext()) {
        MetaObject metaValue = metaObject.metaObjectForProperty(prop.getIndexedName());
        if (metaValue == SystemMetaObject.NULL_META_OBJECT) {
          return metaClass.getSetterType(name);
        } else {
          return metaValue.getSetterType(prop.getChildren());
        }
      } else {
        return metaClass.getSetterType(name);
      }
    }
  
    @Override
    public Class<?> getGetterType(String name) {
      PropertyTokenizer prop = new PropertyTokenizer(name);
      if (prop.hasNext()) {
        MetaObject metaValue = metaObject.metaObjectForProperty(prop.getIndexedName());
        if (metaValue == SystemMetaObject.NULL_META_OBJECT) {
          return metaClass.getGetterType(name);
       } else {
         return metaValue.getGetterType(prop.getChildren());
       }
     } else {
       return metaClass.getGetterType(name);
     }
   }
 
   @Override
   public boolean hasSetter(String name) {
     PropertyTokenizer prop = new PropertyTokenizer(name);
     if (prop.hasNext()) {
       if (metaClass.hasSetter(prop.getIndexedName())) {
         MetaObject metaValue = metaObject.metaObjectForProperty(prop.getIndexedName());
         if (metaValue == SystemMetaObject.NULL_META_OBJECT) {
           return metaClass.hasSetter(name);
         } else {
           return metaValue.hasSetter(prop.getChildren());
         }
       } else {
         return false;
       }
     } else {
       return metaClass.hasSetter(name);
     }
   }
 
   @Override
   public boolean hasGetter(String name) {
     PropertyTokenizer prop = new PropertyTokenizer(name);
     if (prop.hasNext()) {
       if (metaClass.hasGetter(prop.getIndexedName())) {
         MetaObject metaValue = metaObject.metaObjectForProperty(prop.getIndexedName());
         if (metaValue == SystemMetaObject.NULL_META_OBJECT) {
           return metaClass.hasGetter(name);
         } else {
           return metaValue.hasGetter(prop.getChildren());
         }
       } else {
         return false;
       }
     } else {
       return metaClass.hasGetter(name);
     }
   }
 
   @Override
   public MetaObject instantiatePropertyValue(String name, PropertyTokenizer prop, ObjectFactory objectFactory) {
     MetaObject metaValue;
     Class<?> type = getSetterType(prop.getName());
     try {
       Object newObject = objectFactory.create(type);
       metaValue = MetaObject.forObject(newObject, metaObject.getObjectFactory(), metaObject.getObjectWrapperFactory(), metaObject.getReflectorFactory());
       set(prop, newObject);
     } catch (Exception e) {
       throw new ReflectionException("Cannot set value of property '" + name + "' because '" + name + "' is null and cannot be instantiated on instance of " + type.getName() + ". Cause:" + e.toString(), e);
     }
     return metaValue;
   }
 
   private Object getBeanProperty(PropertyTokenizer prop, Object object) {
     try {
       Invoker method = metaClass.getGetInvoker(prop.getName());
       try {
         return method.invoke(object, NO_ARGUMENTS);
       } catch (Throwable t) {
         throw ExceptionUtil.unwrapThrowable(t);
       }
     } catch (RuntimeException e) {
       throw e;
     } catch (Throwable t) {
       throw new ReflectionException("Could not get property '" + prop.getName() + "' from " + object.getClass() + ".  Cause: " + t.toString(), t);
     }
   }
 
   private void setBeanProperty(PropertyTokenizer prop, Object object, Object value) {
     try {
       Invoker method = metaClass.getSetInvoker(prop.getName());
       Object[] params = {value};
       try {
         method.invoke(object, params);
       } catch (Throwable t) {
         throw ExceptionUtil.unwrapThrowable(t);
       }
     } catch (Throwable t) {
       throw new ReflectionException("Could not set property '" + prop.getName() + "' of '" + object.getClass() + "' with value '" + value + "' Cause: " + t.toString(), t);
     }
   }
 
   @Override
   public boolean isCollection() {
     return false;
   }
 
   @Override
   public void add(Object element) {
     throw new UnsupportedOperationException();
   }
 
   @Override
   public <E> void addAll(List<E> list) {
     throw new UnsupportedOperationException();
   }
 
 }