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/*
 * Copyright (c) 2008-2023, Hazelcast, Inc. 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.
 */

package com.hazelcast.query.impl;

import com.hazelcast.config.IndexConfig;
import com.hazelcast.core.TypeConverter;
import com.hazelcast.internal.monitor.impl.PerIndexStats;
import com.hazelcast.query.Predicate;
import com.hazelcast.query.impl.GlobalIndexPartitionTracker.PartitionStamp;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * Extends the basic query context to support the per-index stats tracking on
 * behalf of global indexes.
 */
public class GlobalQueryContextWithStats extends QueryContext {

    private final HashMap knownIndexes = new HashMap<>();

    private final HashSet trackedIndexes = new HashSet<>(8);

    @Override
    void attachTo(Indexes indexes, int ownedPartitionCount) {
        super.attachTo(indexes, ownedPartitionCount);
        for (QueryTrackingIndex trackedIndex : trackedIndexes) {
            trackedIndex.resetPerQueryStats();
        }
        trackedIndexes.clear();
    }

    @Override
    void applyPerQueryStats() {
        for (QueryTrackingIndex trackedIndex : trackedIndexes) {
            trackedIndex.incrementQueryCount();
        }
    }

    @Override
    public Index matchIndex(String pattern, IndexMatchHint matchHint) {
        InternalIndex delegate = indexes.matchIndex(pattern, matchHint, ownedPartitionCount);
        if (delegate == null) {
            return null;
        }

        QueryTrackingIndex trackingIndex = knownIndexes.get(pattern);
        if (trackingIndex == null) {
            trackingIndex = new QueryTrackingIndex();
            knownIndexes.put(pattern, trackingIndex);
        }

        trackingIndex.attachTo(delegate);
        trackedIndexes.add(trackingIndex);

        return trackingIndex;
    }

    @SuppressWarnings({"rawtypes", "checkstyle:MethodCount"})
    private static class QueryTrackingIndex implements InternalIndex {

        private InternalIndex delegate;

        private boolean hasQueries;

        public void attachTo(InternalIndex delegate) {
            this.delegate = delegate;
        }

        public void resetPerQueryStats() {
            hasQueries = false;
        }

        public void incrementQueryCount() {
            if (hasQueries) {
                delegate.getPerIndexStats().incrementQueryCount();
            }
        }

        @Override
        public String getName() {
            return delegate.getName();
        }

        @Override
        public String[] getComponents() {
            return delegate.getComponents();
        }

        @Override
        public IndexConfig getConfig() {
            return delegate.getConfig();
        }

        @Override
        public boolean isOrdered() {
            return delegate.isOrdered();
        }

        @Override
        public TypeConverter getConverter() {
            return delegate.getConverter();
        }

        @Override
        public void putEntry(CachedQueryEntry newEntry, CachedQueryEntry oldEntry, QueryableEntry entryToStore,
                             OperationSource operationSource) {
            delegate.putEntry(newEntry, oldEntry, entryToStore, operationSource);
        }

        @Override
        public void removeEntry(CachedQueryEntry entry, OperationSource operationSource) {
            delegate.removeEntry(entry, operationSource);
        }

        @Override
        public boolean isEvaluateOnly() {
            return delegate.isEvaluateOnly();
        }

        @Override
        public boolean canEvaluate(Class predicateClass) {
            return delegate.canEvaluate(predicateClass);
        }

        @Override
        public Set evaluate(Predicate predicate) {
            Set result = delegate.evaluate(predicate);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIterator(boolean descending) {
            Iterator result = delegate.getSqlRecordIterator(descending);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIterator(Comparable value) {
            Iterator result = delegate.getSqlRecordIterator(value);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIterator(Comparison comparison, Comparable value, boolean descending) {
            Iterator result = delegate.getSqlRecordIterator(comparison, value, descending);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIterator(
            Comparable from,
            boolean fromInclusive,
            Comparable to,
            boolean toInclusive,
            boolean descending
        ) {
            Iterator result = delegate.getSqlRecordIterator(from, fromInclusive, to, toInclusive, descending);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIteratorBatch(Comparable value) {
            Iterator result = delegate.getSqlRecordIteratorBatch(value);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIteratorBatch(boolean descending) {
            Iterator result = delegate.getSqlRecordIteratorBatch(descending);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIteratorBatch(Comparison comparison, Comparable value, boolean descending) {
            Iterator result = delegate.getSqlRecordIteratorBatch(comparison, value, descending);
            hasQueries = true;
            return result;
        }

        @Override
        public Iterator getSqlRecordIteratorBatch(
                Comparable from,
                boolean fromInclusive,
                Comparable to,
                boolean toInclusive,
                boolean descending
        ) {
            Iterator result = delegate.getSqlRecordIteratorBatch(
                    from, fromInclusive, to, toInclusive, descending);
            hasQueries = true;
            return result;
        }

        @Override
        public Set getRecords(Comparable value) {
            Set result = delegate.getRecords(value);
            hasQueries = true;
            return result;
        }

        @Override
        public Set getRecords(Comparable[] values) {
            Set result = delegate.getRecords(values);
            hasQueries = true;
            return result;
        }

        @Override
        public Set getRecords(Comparable from, boolean fromInclusive, Comparable to, boolean toInclusive) {
            Set result = delegate.getRecords(from, fromInclusive, to, toInclusive);
            hasQueries = true;
            return result;
        }

        @Override
        public Set getRecords(Comparison comparison, Comparable value) {
            Set result = delegate.getRecords(comparison, value);
            hasQueries = true;
            return result;
        }

        @Override
        public void clear() {
            delegate.clear();
        }

        @Override
        public void destroy() {
            delegate.destroy();
        }

        @Override
        public Comparable canonicalizeQueryArgumentScalar(Comparable value) {
            return delegate.canonicalizeQueryArgumentScalar(value);
        }

        @Override
        public boolean hasPartitionIndexed(int partitionId) {
            return delegate.hasPartitionIndexed(partitionId);
        }

        @Override
        public boolean allPartitionsIndexed(int ownedPartitionCount) {
            return delegate.allPartitionsIndexed(ownedPartitionCount);
        }

        @Override
        public void beginPartitionUpdate() {
            delegate.beginPartitionUpdate();
        }

        @Override
        public void markPartitionAsIndexed(int partitionId) {
            delegate.markPartitionAsIndexed(partitionId);
        }

        @Override
        public void markPartitionAsUnindexed(int partitionId) {
            delegate.markPartitionAsUnindexed(partitionId);
        }

        @Override
        public PerIndexStats getPerIndexStats() {
            return delegate.getPerIndexStats();
        }

        @Override
        public PartitionStamp getPartitionStamp() {
            return delegate.getPartitionStamp();
        }

        @Override
        public boolean validatePartitionStamp(long stamp) {
            return delegate.validatePartitionStamp(stamp);
        }
    }

}