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/*
 * Copyright 2016-2019 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.glowroot.central.repo;

import java.util.List;
import java.util.Map;
import java.util.concurrent.Future;

import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimaps;
import com.google.common.primitives.Ints;
import com.google.common.util.concurrent.ListenableFuture;
import org.immutables.value.Value;

import org.glowroot.central.util.Cache;
import org.glowroot.central.util.Cache.CacheLoader;
import org.glowroot.central.util.ClusterManager;
import org.glowroot.central.util.MoreFutures;
import org.glowroot.central.util.RateLimiter;
import org.glowroot.central.util.Session;
import org.glowroot.common.util.Styles;
import org.glowroot.common2.repo.TraceAttributeNameRepository;

import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.concurrent.TimeUnit.DAYS;

class TraceAttributeNameDao implements TraceAttributeNameRepository {

    private final Session session;
    private final ConfigRepositoryImpl configRepository;

    private final PreparedStatement insertPS;
    private final PreparedStatement readPS;

    private final RateLimiter rateLimiter = new RateLimiter<>();

    private final Cache>> traceAttributeNamesCache;

    TraceAttributeNameDao(Session session, ConfigRepositoryImpl configRepository,
            ClusterManager clusterManager, int targetMaxCentralUiUsers) throws Exception {
        this.session = session;
        this.configRepository = configRepository;

        session.createTableWithLCS("create table if not exists trace_attribute_name (agent_rollup"
                + " varchar, transaction_type varchar, trace_attribute_name varchar, primary key"
                + " (agent_rollup, transaction_type, trace_attribute_name))");

        insertPS = session.prepare("insert into trace_attribute_name (agent_rollup,"
                + " transaction_type, trace_attribute_name) values (?, ?, ?) using ttl ?");
        readPS = session.prepare("select transaction_type, trace_attribute_name from"
                + " trace_attribute_name where agent_rollup = ?");

        // this cache is primarily used for calculating Glowroot-Agent-Rollup-Layout-Version, which
        // is performed on the user's current agent-id/agent-rollup-id
        traceAttributeNamesCache = clusterManager.createPerAgentCache("traceAttributeNamesCache",
                targetMaxCentralUiUsers, new TraceAttributeNameCacheLoader());
    }

    @Override
    public Map> read(String agentRollupId) throws Exception {
        return traceAttributeNamesCache.get(agentRollupId);
    }

    void store(String agentRollupId, String transactionType, String traceAttributeName,
            List> futures) throws Exception {
        TraceAttributeNameKey rateLimiterKey = ImmutableTraceAttributeNameKey.of(agentRollupId,
                transactionType, traceAttributeName);
        if (!rateLimiter.tryAcquire(rateLimiterKey)) {
            return;
        }
        BoundStatement boundStatement = insertPS.bind();
        int i = 0;
        boundStatement.setString(i++, agentRollupId);
        boundStatement.setString(i++, transactionType);
        boundStatement.setString(i++, traceAttributeName);
        boundStatement.setInt(i++, getTraceTTL());
        ListenableFuture future = session.writeAsync(boundStatement);
        futures.add(MoreFutures.onSuccessAndFailure(future,
                () -> traceAttributeNamesCache.invalidate(agentRollupId),
                () -> rateLimiter.release(rateLimiterKey)));
    }

    private int getTraceTTL() throws Exception {
        int ttl = configRepository.getCentralStorageConfig().getTraceTTL();
        if (ttl == 0) {
            return 0;
        }
        // adding 1 day to account for rateLimiter
        return Ints.saturatedCast(ttl + DAYS.toSeconds(1));
    }

    @Value.Immutable
    @Styles.AllParameters
    interface TraceAttributeNameKey {
        String agentRollupId();
        String transactionType();
        String traceAttributeName();
    }

    private class TraceAttributeNameCacheLoader
            implements CacheLoader>> {
        @Override
        public Map> load(String agentRollupId) throws Exception {
            BoundStatement boundStatement = readPS.bind();
            boundStatement.setString(0, agentRollupId);
            ResultSet results = session.read(boundStatement);
            ListMultimap traceAttributeNames = ArrayListMultimap.create();
            for (Row row : results) {
                int i = 0;
                String transactionType = checkNotNull(row.getString(i++));
                String traceAttributeName = checkNotNull(row.getString(i++));
                traceAttributeNames.put(transactionType, traceAttributeName);
            }
            return Multimaps.asMap(traceAttributeNames);
        }
    }
}