/*-
 * ============LICENSE_START=======================================================
 * ONAP Policy Engine
 * ================================================================================
 * Copyright (C) 2017, 2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.daoImp;

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

import javax.script.SimpleBindings;

import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.criterion.Conjunction;
import org.hibernate.criterion.Disjunction;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.rest.dao.CommonClassDao;
import org.onap.policy.rest.jpa.PolicyRoles;
import org.onap.policy.xacml.api.XACMLErrorConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Service;

@Service("CommonClassDao")
@Primary
public class CommonClassDaoImpl implements CommonClassDao {

    private static final Logger LOGGER = FlexLogger.getLogger(CommonClassDaoImpl.class);
    private static SessionFactory sessionfactory;

    public static SessionFactory getSessionfactory() {
        return sessionfactory;
    }

    public static void setSessionfactory(SessionFactory sessionfactory) {
        CommonClassDaoImpl.sessionfactory = sessionfactory;
    }

    @Autowired
    private CommonClassDaoImpl(SessionFactory sessionfactory) {
        CommonClassDaoImpl.sessionfactory = sessionfactory;
    }

    public CommonClassDaoImpl() {
        // Default Constructor
    }

    @SuppressWarnings({"unchecked", "rawtypes"})
    @Override
    public List<Object> getData(Class className) {
        Session session = sessionfactory.openSession();
        List<Object> data = null;
        try {
            Criteria cr = session.createCriteria(className);
            data = cr.list();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e);
            }
        }
        return data;
    }

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public List<Object> getDataById(Class className, String columnName, String key) {
        Session session = sessionfactory.openSession();
        List<Object> data = null;
        try {
            Criteria cr = session.createCriteria(className);
            if (columnName.contains(":") && key.contains(":")) {
                String[] columns = columnName.split(":");
                String[] keys = key.split(":");
                for (int i = 0; i < columns.length; i++) {
                    cr.add(Restrictions.eq(columns[i], keys[i]));
                }
            } else {
                cr.add(Restrictions.eq(columnName, key));
            }
            data = cr.list();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }
        return data;
    }

    @Override
    public void save(Object entity) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        try {
            session.persist(entity);
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Saving  data to Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }

    }

    @Override
    public void delete(Object entity) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        try {
            session.delete(entity);
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Deleting data from Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }

    }

    @Override
    public void update(Object entity) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        try {
            session.update(entity);
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Updating data to Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }

    }

    @SuppressWarnings({"unchecked", "rawtypes"})
    @Override
    public List<Object> checkDuplicateEntry(String value, String columnName, Class className) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        List<Object> data = null;
        String[] columnNames = null;
        if (columnName != null && columnName.contains(":")) {
            columnNames = columnName.split(":");
        }
        String[] values = null;
        if (value != null && value.contains(":")) {
            values = value.split(":");
        }
        try {
            Criteria cr = session.createCriteria(className);
            if (columnNames != null && values != null && columnNames.length == values.length) {
                for (int i = 0; i < columnNames.length; i++) {
                    cr.add(Restrictions.eq(columnNames[i], values[i]));
                }
            } else {
                cr.add(Restrictions.eq(columnName, value));
            }
            data = cr.list();
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying for Duplicate Entries for Table"
                    + e + className);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }
        return data;
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<PolicyRoles> getUserRoles() {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        List<PolicyRoles> rolesData = null;
        try {
            Criteria cr = session.createCriteria(PolicyRoles.class);
            Disjunction disjunction = Restrictions.disjunction();
            Conjunction conjunction1 = Restrictions.conjunction();
            conjunction1.add(Restrictions.eq("role", "admin"));
            Conjunction conjunction2 = Restrictions.conjunction();
            conjunction2.add(Restrictions.eq("role", "editor"));
            Conjunction conjunction3 = Restrictions.conjunction();
            conjunction3.add(Restrictions.eq("role", "guest"));
            disjunction.add(conjunction1);
            disjunction.add(conjunction2);
            disjunction.add(conjunction3);
            rolesData = cr.add(disjunction).list();
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying PolicyRoles Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }
        return rolesData;
    }

    @Override
    public List<Object> checkExistingGroupListforUpdate(String arg0, String arg1) {
        return Collections.emptyList();
    }

    @Override
    public void deleteAll() {
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<Object> getDataByQuery(String query, SimpleBindings params) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        List<Object> data = null;
        try {
            Query hbquery = session.createQuery(query);
            for (Map.Entry<String, Object> paramPair : params.entrySet()) {
                if (paramPair.getValue() instanceof java.lang.Long) {
                    hbquery.setLong(paramPair.getKey(), (long) paramPair.getValue());
                } else {
                    hbquery.setParameter(paramPair.getKey(), paramPair.getValue());
                }
            }
            data = hbquery.list();
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying Database Table" + e);
            throw e;
        } finally {
            try {
                session.close();
            } catch (HibernateException e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }
        return data;
    }

    @SuppressWarnings("rawtypes")
    @Override
    public Object getEntityItem(Class className, String columnName, String key) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        Object data = null;
        try {
            Criteria cr = session.createCriteria(className);
            if (columnName.contains(":") && key.contains(":")) {
                String[] columns = columnName.split(":");
                String[] keys = key.split(":");
                for (int i = 0; i < columns.length; i++) {
                    cr.add(Restrictions.eq(columns[i], keys[i]));
                }
            } else {
                cr.add(Restrictions.eq(columnName, key));
            }
            data = cr.list().get(0);
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying Database Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }
        return data;
    }

    @Override
    public void updateClAlarms(String arg0, String arg1) {
    }

    @Override
    public void updateClYaml(String arg0, String arg1) {
    }

    @Override
    public void updateQuery(String query) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        try {
            Query hbquery = session.createQuery(query);
            hbquery.executeUpdate();
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Updating Database Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }

    }

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public List<String> getDataByColumn(Class className, String columnName) {
        Session session = sessionfactory.openSession();
        List<String> data = null;
        try {
            Criteria cr = session.createCriteria(className);
            cr.setProjection(Projections.property(columnName));
            data = cr.list();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying Table" + e);
        } finally {
            try {
                session.close();
            } catch (Exception e) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e);
            }
        }
        return data;
    }

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public List<Object> getMultipleDataOnAddingConjunction(Class className, String columnName, List<String> data) {
        Session session = sessionfactory.openSession();
        Transaction tx = session.beginTransaction();
        List<Object> entityData = null;
        try {
            Criteria cr = session.createCriteria(className);
            Disjunction disjunction = Restrictions.disjunction();
            List<Conjunction> conjunctionList = new ArrayList<>();
            String[] columNames = columnName.split(":");
            for (int i = 0; i < data.size(); i++) {
                String[] entiySplit = data.get(i).split(":");
                Conjunction conjunction = Restrictions.conjunction();
                conjunction.add(Restrictions.eq(columNames[0], entiySplit[0]));
                conjunction.add(Restrictions.eq(columNames[1], entiySplit[1]));
                conjunctionList.add(conjunction);
            }
            for (int j = 0; j < conjunctionList.size(); j++) {
                disjunction.add(conjunctionList.get(j));
            }
            entityData = cr.add(disjunction).list();
            tx.commit();
        } catch (Exception e) {
            LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Querying Table" + className + e);
        } finally {
            try {
                session.close();
            } catch (Exception e1) {
                LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Error While Closing Connection/Statement" + e1);
            }
        }
        return entityData;
    }

}