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package com.blazebit.persistence.impl.util;

import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;

import javax.persistence.OrderColumn;
import javax.persistence.metamodel.*;
import javax.persistence.metamodel.Attribute.PersistentAttributeType;

import com.blazebit.reflection.ReflectionUtils;

/**
 *
 * @author Moritz Becker
 * @since 1.2.0
 */
public class MetamodelUtils {

	public static ManagedType resolveManagedTargetType(Metamodel metamodel, Class entityClass, String path) {
    	String[] pathElements = path.split("\\.");
    	ManagedType currentType = metamodel.entity(entityClass);
        for (String property : pathElements) {
    		Attribute attribute = currentType.getAttribute(property);
    		Class type = attribute.getJavaType();
    		
    		if (Collection.class.isAssignableFrom(type) || Map.class.isAssignableFrom(type)) {
            	Class[] typeArguments = ReflectionUtils.getResolvedMethodReturnTypeArguments(currentType.getJavaType(), ReflectionUtils.getGetter(currentType.getJavaType(), property));
            	type = typeArguments[typeArguments.length - 1];
            }
    		
    		if (attribute.getPersistentAttributeType() == PersistentAttributeType.BASIC) {
    			throw new RuntimeException("Path [" + path.toString() + "] contains BASIC path element");
    		} else  {
    			currentType = metamodel.managedType(type);
    		}
        }
        
        return currentType;
    }

	public static Attribute resolveTargetAttribute(Metamodel metamodel, Class entityClass, String path) {
		String[] pathElements = path.split("\\.");
		ManagedType managedType;
		if (pathElements.length > 1) {
			String subpath = path.substring(0, path.lastIndexOf('.'));
			managedType = MetamodelUtils.resolveManagedTargetType(metamodel, entityClass, subpath);
		} else {
			managedType = metamodel.entity(entityClass);
		}

		return managedType.getAttribute(pathElements[pathElements.length - 1]);
	}

}