/*
 *  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.viewer.wicket.ui.panels;

import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.IFormSubmitter;
import org.apache.wicket.model.IModel;

import org.apache.isis.core.metamodel.adapter.concurrency.ConcurrencyChecking;
import org.apache.isis.core.metamodel.services.ServicesInjector;
import org.apache.isis.core.metamodel.specloader.SpecificationLoader;
import org.apache.isis.core.runtime.system.context.IsisContext;
import org.apache.isis.core.runtime.system.persistence.PersistenceSession;
import org.apache.isis.core.runtime.system.session.IsisSessionFactory;
import org.apache.isis.core.security.authentication.AuthenticationSession;
import org.apache.isis.viewer.wicket.ui.app.registry.ComponentFactoryRegistry;
import org.apache.isis.viewer.wicket.ui.app.registry.ComponentFactoryRegistryAccessor;
import org.apache.isis.viewer.wicket.ui.pages.PageClassRegistry;
import org.apache.isis.viewer.wicket.ui.pages.PageClassRegistryAccessor;

public abstract class FormAbstract<T> extends Form<T>
implements ComponentFactoryRegistryAccessor, PageClassRegistryAccessor {

    private static final long serialVersionUID = 1L;

    public FormAbstract(final String id) {
        super(id);
    }

    public FormAbstract(final String id, final IModel<T> model) {
        super(id, model);
    }


    // ///////////////////////////////////////////////////////////////////
    // process() override
    // ///////////////////////////////////////////////////////////////////

    private String preValidationErrorIfAny;

    @Override
    public void process(final IFormSubmitter submittingComponent) {
        try {

            if(submittingComponent instanceof IFormSubmitterWithPreValidateHook) {
                IFormSubmitterWithPreValidateHook componentWithPreSubmitHook = (IFormSubmitterWithPreValidateHook) submittingComponent;
                preValidationErrorIfAny = componentWithPreSubmitHook.preValidate();
            }

            if(preValidationErrorIfAny != null) {
                // an exception has already occurred, so disable for remainder of thread.
                ConcurrencyChecking.executeWithConcurrencyCheckingDisabled(new Runnable(){
                    @Override
                    public void run() {
                        FormAbstract.super.process(submittingComponent);
                    }
                });
            } else {
                super.process(submittingComponent);
            }

        } finally {
            preValidationErrorIfAny = null;
        }
    }


    // ///////////////////////////////////////////////////////////////////
    // Convenience
    // ///////////////////////////////////////////////////////////////////

    @Override
    public ComponentFactoryRegistry getComponentFactoryRegistry() {
        return ((ComponentFactoryRegistryAccessor) getApplication()).getComponentFactoryRegistry();
    }

    @Override
    public PageClassRegistry getPageClassRegistry() {
        return ((PageClassRegistryAccessor) getApplication()).getPageClassRegistry();
    }

    // ///////////////////////////////////////////////////////////////////
    // Dependencies (from IsisContext)
    // ///////////////////////////////////////////////////////////////////

    protected  PersistenceSession getPersistenceSession() {
        return getIsisSessionFactory().getCurrentSession().getPersistenceSession();
    }

    protected  AuthenticationSession getAuthenticationSession() {
        return getIsisSessionFactory().getCurrentSession().getAuthenticationSession();
    }

    public SpecificationLoader getSpecificationLoader() {
        return getIsisSessionFactory().getSpecificationLoader();
    }

    protected ServicesInjector getServicesInjector() {
        return getIsisSessionFactory().getServicesInjector();
    }

    protected IsisSessionFactory getIsisSessionFactory() {
        return IsisContext.getSessionFactory();
    }

}
