/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.isis.core.unittestsupport.bidir;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;

class Parent {
    Class<?> entityType;
    Field childField;
    String mappedBy;
    Method getMethod;

    // for 1:m
    Method addToMethod;
    Method removeFromMethod;

    // if 1:1
    Method modifyMethod;
    Method clearMethod;

    Collection<?> getChildren(Object parent) throws RuntimeException {
        try {
            return (Collection<?>) getMethod.invoke(parent);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    void addToChildren(Object parent, Object child) {
        try {
            addToMethod.invoke(parent, child);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    void removeFromChildren(Object parent, Object child) {
        try {
            removeFromMethod.invoke(parent, child);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    Object getChild(Object parent) {
        try {
            return getMethod.invoke(parent);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    void modifyChild(Object parent, Object child) {
        try {
            modifyMethod.invoke(parent, child);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    void clearChild(Object parent) {
        try {
            clearMethod.invoke(parent);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    String desc() {
        return entityType.getName()+"#"+childField.getName();
    }
    String descRel(Child c) {
        final boolean oneToMany = addToMethod != null;
        return entityType.getSimpleName() + "#" + childField.getName() + " 1:" + (oneToMany?"m":"1") + " "+ c.entityType.getSimpleName() + "#" + c.parentField.getName();
    }

    Object newParent(Instantiators instantiators) {
        return instantiators.newInstance(entityType);
    }
}