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/* 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.
 */

package org.flowable.idm.spring;

import javax.sql.DataSource;

import org.flowable.common.engine.api.FlowableException;
import org.flowable.common.engine.impl.interceptor.CommandConfig;
import org.flowable.common.engine.impl.interceptor.CommandInterceptor;
import org.flowable.idm.engine.IdmEngine;
import org.flowable.idm.engine.IdmEngineConfiguration;
import org.flowable.idm.engine.IdmEngines;
import org.flowable.idm.engine.impl.cfg.StandaloneIdmEngineConfiguration;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;
import org.springframework.transaction.PlatformTransactionManager;

/**
 * @author Tijs Rademakers
 * @author David Syer
 * @author Joram Barrez
 */
public class SpringIdmEngineConfiguration extends IdmEngineConfiguration implements ApplicationContextAware {

    protected PlatformTransactionManager transactionManager;
    protected ApplicationContext applicationContext;
    protected Integer transactionSynchronizationAdapterOrder;

    public SpringIdmEngineConfiguration() {
        this.transactionsExternallyManaged = true;
    }

    @Override
    public IdmEngine buildIdmEngine() {
        IdmEngine idmEngine = super.buildIdmEngine();
        IdmEngines.setInitialized(true);
        return idmEngine;
    }
    public void setTransactionSynchronizationAdapterOrder(Integer transactionSynchronizationAdapterOrder) {
        this.transactionSynchronizationAdapterOrder = transactionSynchronizationAdapterOrder;
    }

    @Override
    public void initDefaultCommandConfig() {
        if (defaultCommandConfig == null) {
            defaultCommandConfig = new CommandConfig().setContextReusePossible(true);
        }
    }

    @Override
    public CommandInterceptor createTransactionInterceptor() {
        if (transactionManager == null) {
            throw new FlowableException("transactionManager is required property for SpringIdmEngineConfiguration, use " + StandaloneIdmEngineConfiguration.class.getName() + " otherwise");
        }

        return new SpringTransactionInterceptor(transactionManager);
    }

    @Override
    public void initTransactionContextFactory() {
        if (transactionContextFactory == null && transactionManager != null) {
            transactionContextFactory = new SpringTransactionContextFactory(transactionManager, transactionSynchronizationAdapterOrder);
        }
    }

    @Override
    public IdmEngineConfiguration setDataSource(DataSource dataSource) {
        if (dataSource instanceof TransactionAwareDataSourceProxy) {
            return (IdmEngineConfiguration) super.setDataSource(dataSource);
        } else {
            // Wrap datasource in Transaction-aware proxy
            DataSource proxiedDataSource = new TransactionAwareDataSourceProxy(dataSource);
            return (IdmEngineConfiguration) super.setDataSource(proxiedDataSource);
        }
    }

    public PlatformTransactionManager getTransactionManager() {
        return transactionManager;
    }

    public void setTransactionManager(PlatformTransactionManager transactionManager) {
        this.transactionManager = transactionManager;
    }

    public ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}