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/*-
 * ========================LICENSE_START=================================
 * smooks-persistence-cartridge
 * %%
 * Copyright (C) 2020 Smooks
 * %%
 * Licensed under the terms of the Apache License Version 2.0, or
 * the GNU Lesser General Public License version 3.0 or later.
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-or-later
 *
 * ======================================================================
 *
 * 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.
 *
 * ======================================================================
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * =========================LICENSE_END==================================
 */
package org.smooks.cartridges.persistence.observers;

import org.smooks.api.ExecutionContext;
import org.smooks.api.bean.lifecycle.BeanContextLifecycleEvent;
import org.smooks.api.bean.lifecycle.BeanContextLifecycleObserver;
import org.smooks.api.bean.lifecycle.BeanLifecycle;
import org.smooks.api.bean.repository.BeanId;
import org.smooks.cartridges.javabean.BeanRuntimeInfo;
import org.smooks.cartridges.javabean.BeanRuntimeInfo.Classification;
import org.smooks.cartridges.persistence.EntityLocatorParameterVisitor;

/**
 * Bean creation lifecycle observer.
 *
 * @author [email protected]
 */
public class BeanCreateLifecycleObserver implements BeanContextLifecycleObserver {

    private EntityLocatorParameterVisitor populator;
    private BeanId watchedBean;
    private BeanRuntimeInfo wiredBeanRI;
    private ArrayToListChangeObserver arrayToListChangeObserver;

    /**
     * Public constructor.
     *
     * @param beanContext The associ
     * @param populator
     * @param watchedBean
     * @param wiredBeanRI
     */
    public BeanCreateLifecycleObserver(BeanId watchedBean, EntityLocatorParameterVisitor populator, BeanRuntimeInfo wiredBeanRI) {
        this.watchedBean = watchedBean;
        this.populator = populator;
        this.wiredBeanRI = wiredBeanRI;
    }

    /* (non-Javadoc)
     * @see org.smooks.javabean.lifecycle.BeanContextLifecycleObserver#onBeanLifecycleEvent(org.smooks.javabean.lifecycle.BeanContextLifecycleEvent)
     */
    public void onBeanLifecycleEvent(BeanContextLifecycleEvent event) {
        if (event.getBean() == watchedBean) {
            switch (event.getLifecycle()) {
                case ADD:
                    if (wiredBeanRI != null && wiredBeanRI.getClassification() == Classification.ARRAY_COLLECTION) {
                        // Register an observer which looks for the change that the mutable
                        // list of the selected bean gets converted to an array. We
                        // can then set this array
                        arrayToListChangeObserver = new ArrayToListChangeObserver();
                        event.getExecutionContext().getBeanContext().addObserver(arrayToListChangeObserver);
                    } else {
                        populator.populateAndSetPropertyValue(event.getBean(), event.getExecutionContext());
                    }
                case REMOVE:
                    try {
                        if (arrayToListChangeObserver != null) {
                            event.getExecutionContext().getBeanContext().removeObserver(arrayToListChangeObserver);
                        }
                    } finally {
                        event.getExecutionContext().getBeanContext().removeObserver(this);
                    }
            }
        }
    }

    class ArrayToListChangeObserver implements BeanContextLifecycleObserver {

        /* (non-Javadoc)
         * @see org.smooks.javabean.lifecycle.BeanContextLifecycleObserver#onBeanLifecycleEvent(org.smooks.javabean.lifecycle.BeanContextLifecycleEvent)
         */
        public void onBeanLifecycleEvent(BeanContextLifecycleEvent event) {
            if (event.getBeanId() == watchedBean && event.getLifecycle() == BeanLifecycle.CHANGE) {
                ExecutionContext executionContext = event.getExecutionContext();

                // Set the list on the object, via the populator...
                populator.populateAndSetPropertyValue(event.getBean(), executionContext);
                // Remove this observer...
                executionContext.getBeanContext().removeObserver(this);
                arrayToListChangeObserver = null;
            }
        }
    }
}