/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.as.jpa.hibernate5.management;


import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.EntityManagerFactory;

import org.hibernate.SessionFactory;
import org.jipijapa.management.spi.EntityManagerFactoryAccess;
import org.jipijapa.management.spi.Operation;
import org.jipijapa.management.spi.PathAddress;

/**
 * Hibernate query cache statistics
 *
 * @author Scott Marlow
 */
public class HibernateQueryCacheStatistics extends HibernateAbstractStatistics {

    public static final String ATTRIBUTE_QUERY_NAME = "query-name";
    public static final String OPERATION_QUERY_EXECUTION_COUNT = "query-execution-count";
    public static final String OPERATION_QUERY_EXECUTION_ROW_COUNT = "query-execution-row-count";
    public static final String OPERATION_QUERY_EXECUTION_AVG_TIME = "query-execution-average-time";
    public static final String OPERATION_QUERY_EXECUTION_MAX_TIME = "query-execution-max-time";
    public static final String OPERATION_QUERY_EXECUTION_MIN_TIME = "query-execution-min-time";
    public static final String OPERATION_QUERY_CACHE_HIT_COUNT = "query-cache-hit-count";
    public static final String OPERATION_QUERY_CACHE_MISS_COUNT = "query-cache-miss-count";
    public static final String OPERATION_QUERY_CACHE_PUT_COUNT = "query-cache-put-count";

    public HibernateQueryCacheStatistics() {
        /**
         * specify the different operations
         */
        operations.put(ATTRIBUTE_QUERY_NAME, showQueryName);
        types.put(ATTRIBUTE_QUERY_NAME,String.class);

        operations.put(OPERATION_QUERY_EXECUTION_COUNT, queryExecutionCount);
        types.put(OPERATION_QUERY_EXECUTION_COUNT, Long.class);

        operations.put(OPERATION_QUERY_EXECUTION_ROW_COUNT, queryExecutionRowCount);
        types.put(OPERATION_QUERY_EXECUTION_ROW_COUNT, Long.class);

        operations.put(OPERATION_QUERY_EXECUTION_AVG_TIME, queryExecutionAverageTime);
        types.put(OPERATION_QUERY_EXECUTION_AVG_TIME, Long.class);

        operations.put(OPERATION_QUERY_EXECUTION_MAX_TIME, queryExecutionMaximumTime);
        types.put(OPERATION_QUERY_EXECUTION_MAX_TIME, Long.class);

        operations.put(OPERATION_QUERY_EXECUTION_MIN_TIME, queryExecutionMinimumTime);
        types.put(OPERATION_QUERY_EXECUTION_MIN_TIME, Long.class);

        operations.put(OPERATION_QUERY_CACHE_HIT_COUNT, queryCacheHitCount);
        types.put(OPERATION_QUERY_CACHE_HIT_COUNT, Long.class);

        operations.put(OPERATION_QUERY_CACHE_MISS_COUNT, queryCacheMissCount);
        types.put(OPERATION_QUERY_CACHE_MISS_COUNT, Long.class);

        operations.put(OPERATION_QUERY_CACHE_PUT_COUNT, queryCachePutCount);
        types.put(OPERATION_QUERY_CACHE_PUT_COUNT, Long.class);
   }

    @Override
    public Collection<String> getDynamicChildrenNames(EntityManagerFactoryAccess entityManagerFactoryLookup, PathAddress pathAddress) {
        Set<String> result = new HashSet<>();
        org.hibernate.stat.Statistics stats = getBaseStatistics(entityManagerFactoryLookup.entityManagerFactory(pathAddress.getValue(HibernateStatistics.PROVIDER_LABEL)));
        if (stats != null) {
            String[] queries = stats.getQueries();
            if (queries != null) {
                for (String query : queries) {
                    result.add(QueryName.queryName(query).getDisplayName());
                }
            }
        }
        return result;
    }

    private org.hibernate.stat.Statistics getBaseStatistics(EntityManagerFactory entityManagerFactory) {
        if (entityManagerFactory == null) {
            return null;
        }
        SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
        if (sessionFactory != null) {
            return sessionFactory.getStatistics();
        }
        return null;
    }

    private org.hibernate.stat.QueryStatistics getStatistics(EntityManagerFactory entityManagerFactory, String displayQueryName) {
        if (entityManagerFactory == null) {
            return null;
        }
        SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
        // convert displayed (transformed by QueryNames) query name to original query name to look up query statistics
        if (sessionFactory != null) {
            String[] originalQueryNames = sessionFactory.getStatistics().getQueries();
            if (originalQueryNames != null) {
                for (String originalQueryName : originalQueryNames) {
                    if (QueryName.queryName(originalQueryName).getDisplayName().equals(displayQueryName)) {
                        return sessionFactory.getStatistics().getQueryStatistics(originalQueryName);
                    }
                }
            }
        }
        return null;
    }

    private Operation queryExecutionCount = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getExecutionCount() : 0);
        }
    };

    private Operation queryExecutionMaximumTime = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getExecutionMaxTime() : 0);
        }
    };

    private Operation queryExecutionRowCount = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getExecutionRowCount() : 0);
        }
    };

    private Operation queryExecutionAverageTime = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getExecutionAvgTime() : 0);
        }
    };

    private Operation queryExecutionMinimumTime = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getExecutionMinTime() : 0);
        }
    };

    private Operation queryCacheHitCount = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getCacheHitCount() : 0);
        }
    };

    private Operation queryCacheMissCount = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getCacheMissCount() : 0);
        }
    };

    private Operation queryCachePutCount = new Operation() {
        @Override
        public Object invoke(Object... args) {
            org.hibernate.stat.QueryStatistics statistics = getStatistics(getEntityManagerFactory(args), getQueryName(args));
            return Long.valueOf(statistics != null ? statistics.getCachePutCount() : 0);
        }
    };

    private Operation showQueryName = new Operation() {
        @Override
        public Object invoke(Object... args) {
            String displayQueryName = getQueryName(args);
            EntityManagerFactory entityManagerFactory = getEntityManagerFactory(args);
            if (displayQueryName != null && entityManagerFactory != null) {
                SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
                // convert displayed (transformed by QueryNames) query name to original query name
                if (sessionFactory != null) {
                    String[] originalQueryNames = sessionFactory.getStatistics().getQueries();
                    if (originalQueryNames != null) {
                        for (String originalQueryName : originalQueryNames) {
                            if (QueryName.queryName(originalQueryName).getDisplayName().equals(displayQueryName)) {
                                return originalQueryName;
                            }
                        }
                    }
                }

            }
            return null;
        }
    };

    private String getQueryName(Object... args) {
        PathAddress pathAddress = getPathAddress(args);
        if (pathAddress != null) {
            return pathAddress.getValue(HibernateStatistics.QUERYCACHE);
        }
        return null;
    }
}
