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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.property.access.internal;

import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

import javax.persistence.Access;
import javax.persistence.AccessType;
import org.hibernate.PropertyNotFoundException;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.property.access.spi.Getter;
import org.hibernate.property.access.spi.GetterFieldImpl;
import org.hibernate.property.access.spi.GetterMethodImpl;
import org.hibernate.property.access.spi.PropertyAccess;
import org.hibernate.property.access.spi.PropertyAccessBuildingException;
import org.hibernate.property.access.spi.PropertyAccessStrategy;
import org.hibernate.property.access.spi.Setter;
import org.hibernate.property.access.spi.SetterFieldImpl;
import org.hibernate.property.access.spi.SetterMethodImpl;

import static org.hibernate.internal.util.ReflectHelper.getterMethodOrNull;
import static org.hibernate.internal.util.ReflectHelper.findSetterMethod;

/**
 * A PropertyAccess based on mix of getter/setter method and/or field.
 *
 * @author Steve Ebersole
 */
public class PropertyAccessMixedImpl implements PropertyAccess {
	private final PropertyAccessStrategy strategy;

	private final Getter getter;
	private final Setter setter;

	public PropertyAccessMixedImpl(
			PropertyAccessStrategy strategy,
			Class containerJavaType,
			String propertyName) {
		this.strategy = strategy;

		AccessType propertyAccessType = getAccessType( containerJavaType, propertyName );

		switch ( propertyAccessType ) {
			case FIELD: {
				Field field = fieldOrNull( containerJavaType, propertyName );
				if ( field == null ) {
					throw new PropertyAccessBuildingException(
						"Could not locate field for property named [" + containerJavaType.getName() + "#" + propertyName + "]"
					);
				}
				this.getter = fieldGetter( containerJavaType, propertyName, field );
				this.setter = fieldSetter( containerJavaType, propertyName, field );
				break;
			}
			case PROPERTY: {
				Method getterMethod = getterMethodOrNull( containerJavaType, propertyName );
				if ( getterMethod == null ) {
					throw new PropertyAccessBuildingException(
						"Could not locate getter for property named [" + containerJavaType.getName() + "#" + propertyName + "]"
					);
				}
				Method setterMethod = findSetterMethod( containerJavaType, propertyName, getterMethod.getReturnType() );

				this.getter = propertyGetter( containerJavaType, propertyName, getterMethod );
				this.setter = propertySetter( containerJavaType, propertyName, setterMethod );
				break;
			}
			default: {
				throw new PropertyAccessBuildingException(
					"Invalid access type " + propertyAccessType + " for property named [" + containerJavaType.getName() + "#" + propertyName + "]"
				);
			}
		}
	}

	protected static Field fieldOrNull(Class containerJavaType, String propertyName) {
		try {
			return ReflectHelper.findField( containerJavaType, propertyName );
		}
		catch (PropertyNotFoundException e) {
			return null;
		}
	}

	protected static AccessType getAccessType(Class containerJavaType, String propertyName) {
		Field field = fieldOrNull( containerJavaType, propertyName );
		AccessType fieldAccessType = getAccessTypeOrNull( field );
		if ( fieldAccessType != null ) {
			return fieldAccessType;
		}
		AccessType methodAccessType = getAccessTypeOrNull( getterMethodOrNull( containerJavaType, propertyName ) );
		if ( methodAccessType != null ) {
			return methodAccessType;
		}
		// No @Access on property or field; check to see if containerJavaType has an explicit @Access
		AccessType classAccessType = getAccessTypeOrNull( containerJavaType );
		if ( classAccessType != null ) {
			return classAccessType;
		}
		return field != null ? AccessType.FIELD : AccessType.PROPERTY;
	}

	private static AccessType getAccessTypeOrNull(AnnotatedElement element) {
		if ( element == null ) {
			return null;
		}
		Access elementAccess = element.getAnnotation( Access.class );
		return elementAccess == null ? null : elementAccess.value();
	}

	// --- //

	protected Getter fieldGetter(Class containerJavaType, String propertyName, Field field) {
		return new GetterFieldImpl( containerJavaType, propertyName, field );
	}

	protected Setter fieldSetter(Class containerJavaType, String propertyName, Field field) {
		return new SetterFieldImpl( containerJavaType, propertyName, field );
	}

	protected Getter propertyGetter(Class containerJavaType, String propertyName, Method method) {
		return new GetterMethodImpl( containerJavaType, propertyName, method );
	}

	protected Setter propertySetter(Class containerJavaType, String propertyName, Method method) {
		return method == null ? null : new SetterMethodImpl( containerJavaType, propertyName, method );
	}

	@Override
	public PropertyAccessStrategy getPropertyAccessStrategy() {
		return strategy;
	}

	@Override
	public Getter getGetter() {
		return getter;
	}

	@Override
	public Setter getSetter() {
		return setter;
	}
}