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/*
 * Copyright 2008-2013 the original author or authors.
 *
 * 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.broadleafcommerce.cms.page.dao;

import org.broadleafcommerce.cms.page.domain.Page;
import org.broadleafcommerce.cms.page.domain.PageField;
import org.broadleafcommerce.cms.page.domain.PageImpl;
import org.broadleafcommerce.cms.page.domain.PageTemplate;
import org.broadleafcommerce.cms.page.domain.PageTemplateImpl;
import org.broadleafcommerce.common.locale.domain.Locale;
import org.broadleafcommerce.common.persistence.EntityConfiguration;
import org.broadleafcommerce.common.sandbox.domain.SandBox;
import org.broadleafcommerce.common.sandbox.domain.SandBoxImpl;
import org.broadleafcommerce.common.sandbox.domain.SandBoxType;
import org.hibernate.ejb.QueryHints;
import org.springframework.stereotype.Repository;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;

/**
 * Created by bpolster.
 */
@Repository("blPageDao")
public class PageDaoImpl implements PageDao {

    private static SandBox DUMMY_SANDBOX = new SandBoxImpl();
    {
        DUMMY_SANDBOX.setId(-1l);
    }

    @PersistenceContext(unitName = "blPU")
    protected EntityManager em;

    @Resource(name="blEntityConfiguration")
    protected EntityConfiguration entityConfiguration;

    @Override
    public Page readPageById(Long id) {
        return em.find(PageImpl.class, id);
    }

    @Override
    public PageTemplate readPageTemplateById(Long id) {
        return em.find(PageTemplateImpl.class, id);
    }
    

    @Override
    public PageTemplate savePageTemplate(PageTemplate template) {
        return em.merge(template);
    }

    @Override
    public Map readPageFieldsByPage(Page page) {
        Query query = em.createNamedQuery("BC_READ_PAGE_FIELDS_BY_PAGE_ID");
        query.setParameter("page", page);
        query.setHint(QueryHints.HINT_CACHEABLE, true);

        List pageFields = query.getResultList();
        Map pageFieldMap = new HashMap();
        for (PageField pageField : pageFields) {
            pageFieldMap.put(pageField.getFieldKey(), pageField);
        }
        return pageFieldMap;
    }

    @Override
    public Page updatePage(Page page) {
        return em.merge(page);
    }

    @Override
    public void delete(Page page) {
        if (!em.contains(page)) {
            page = readPageById(page.getId());
        }
        em.remove(page);
    }

    @Override
    public Page addPage(Page clonedPage) {
        return em.merge(clonedPage);
    }

    @Override
    public List findPageByURI(SandBox sandBox, Locale fullLocale, Locale languageOnlyLocale, String uri) {
        Query query;

        if (languageOnlyLocale == null)  {
            languageOnlyLocale = fullLocale;
        }

        // locale
        if (sandBox == null) {
            query = em.createNamedQuery("BC_READ_PAGE_BY_URI");
        } else if (SandBoxType.PRODUCTION.equals(sandBox.getSandBoxType())) {
            query = em.createNamedQuery("BC_READ_PAGE_BY_URI_AND_PRODUCTION_SANDBOX");
            query.setParameter("sandbox", sandBox);
        } else {
            query = em.createNamedQuery("BC_READ_PAGE_BY_URI_AND_USER_SANDBOX");
            query.setParameter("sandboxId", sandBox.getId());
        }

        query.setParameter("fullLocale", fullLocale);
        query.setParameter("languageOnlyLocale", languageOnlyLocale);
        query.setParameter("uri", uri);

        return query.getResultList();
    }
    
    @Override
    public List readAllPages() {
        CriteriaBuilder builder = em.getCriteriaBuilder();
        CriteriaQuery criteria = builder.createQuery(Page.class);
        Root page = criteria.from(PageImpl.class);

        criteria.select(page);

        try {
            return em.createQuery(criteria).getResultList();
        } catch (NoResultException e) {
            return new ArrayList();
        }
    }
    
    @Override
    public List readAllPageTemplates() {
        CriteriaBuilder builder = em.getCriteriaBuilder();
        CriteriaQuery criteria = builder.createQuery(PageTemplate.class);
        Root template = criteria.from(PageTemplateImpl.class);

        criteria.select(template);

        try {
            return em.createQuery(criteria).getResultList();
        } catch (NoResultException e) {
            return new ArrayList();
        }
    }

    @Override
    public List findPageByURI(SandBox sandBox, Locale locale, String uri) {
        return findPageByURI(sandBox, locale, null, uri);
    }

    @Override
    public void detachPage(Page page) {
        em.detach(page);
    }

}