/*
 * eGov suite of products aim to improve the internal efficiency,transparency,
 *    accountability and the service delivery of the government  organizations.
 *
 *     Copyright (C) <2015>  eGovernments Foundation
 *
 *     The updated version of eGov suite of products as by eGovernments Foundation
 *     is available at http://www.egovernments.org
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program. If not, see http://www.gnu.org/licenses/ or
 *     http://www.gnu.org/licenses/gpl.html .
 *
 *     In addition to the terms of the GPL license to be adhered to in using this
 *     program, the following additional terms are to be complied with:
 *
 *         1) All versions of this program, verbatim or modified must carry this
 *            Legal Notice.
 *
 *         2) Any misrepresentation of the origin of the material is prohibited. It
 *            is required that all modified versions of this material be marked in
 *            reasonable ways as different from the original version.
 *
 *         3) This license does not grant any rights to any user of the program
 *            with regards to rights under trademark law for use of the trade names
 *            or trademarks of eGovernments Foundation.
 *
 *   In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
 */

package org.egov.infra.workflow.inbox;

import org.egov.infra.workflow.entity.State.StateStatus;
import org.egov.infra.workflow.entity.StateAware;
import org.egov.infstr.services.PersistenceService;
import org.hibernate.FetchMode;
import org.hibernate.FlushMode;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;

import java.util.List;

/**
 * Every module which is having StateAware should initialize this with their own
 * StateAware persistence service<br/>
 * eg:
 * 
 * <pre>
 *      <bean id="myStateAwarePersistenceService" parent="persistenceService">
 *                 <property name="type" value="org.egov.infra.web.struts.actions.common.MyStateAware" />
 *         </bean>
 *         
 *         <bean id="MyStateAwareInboxRenderService" class="org.egov.infra.workflow.inbox.DefaultInboxRenderServiceImpl">
 *                 <constructor-arg index="0" ref="myStateAwarePersistenceService"/>
 *         </bean>
 * </pre>
 * 
 * <br/>
 * id or name attribute value of the workflowTypeService bean definition should
 * follow a strict naming convention as follows<br/>
 * <code>
 * <YourStateAwareClassName>InboxRenderService
 * </code> This is how, {@link InboxRenderServiceDeligate} will detect the
 * appropriate {@link InboxRenderService} and render the inbox items.
 **/
@SuppressWarnings("all")
public class DefaultInboxRenderServiceImpl<T extends StateAware> implements InboxRenderService<T> {

    private final Class<T> stateAwareType;
    private final PersistenceService<T, Long> stateAwarePersistenceService;

    public DefaultInboxRenderServiceImpl(final PersistenceService<T, Long> stateAwarePersistenceService) {
        this.stateAwarePersistenceService = stateAwarePersistenceService;
        this.stateAwareType = stateAwarePersistenceService.getType();
    }

    @Override
    public List<T> getAssignedWorkflowItems(final Long userId, final List<Long> owners) {
        return this.stateAwarePersistenceService.getSession().createCriteria(this.stateAwareType)
                .setFetchMode("state", FetchMode.JOIN).createAlias("state", "state")
                .setFlushMode(FlushMode.MANUAL).setReadOnly(true).setCacheable(true)
                .add(Restrictions.eq("state.type", this.stateAwareType.getSimpleName()))
                .add(Restrictions.in("state.ownerPosition.id", owners))
                .add(Restrictions.ne("state.status", StateStatus.ENDED))
                .add(Restrictions.not(Restrictions.conjunction().add(Restrictions.eq("state.status", StateStatus.STARTED))
                        .add(Restrictions.eq("createdBy.id", userId)))).addOrder(Order.desc("state.createdDate"))
                        .list();
    }

    @Override
    public List<T> getDraftWorkflowItems(final Long userId, final List<Long> owners) {
        return this.stateAwarePersistenceService.getSession().createCriteria(this.stateAwareType)
                .setFetchMode("state", FetchMode.JOIN).createAlias("state", "state")
                .setFlushMode(FlushMode.MANUAL).setReadOnly(true).setCacheable(true)
                .add(Restrictions.eq("state.type", this.stateAwareType.getSimpleName()))
                .add(Restrictions.in("state.ownerPosition.id", owners)).add(Restrictions.eq("createdBy.id", userId))
                .add(Restrictions.eq("state.status", StateStatus.STARTED)).addOrder(Order.asc("state.createdDate"))
                .list();
    }
}