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/*
 * (c) Copyright 2018 Palantir Technologies 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.palantir.atlasdb.keyvalue.cassandra;

import com.palantir.atlasdb.cassandra.CassandraKeyValueServiceConfig;
import com.palantir.atlasdb.keyvalue.api.InsufficientConsistencyException;
import com.palantir.atlasdb.keyvalue.api.TableReference;
import com.palantir.common.base.FunctionCheckedException;
import com.palantir.common.base.Throwables;
import java.util.Locale;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.cassandra.thrift.CfDef;
import org.apache.cassandra.thrift.KsDef;
import org.apache.thrift.TException;

class CassandraTables {
    private final CassandraClientPool clientPool;
    private final CassandraKeyValueServiceConfig config;

    CassandraTables(CassandraClientPool clientPool, CassandraKeyValueServiceConfig config) {
        this.clientPool = clientPool;
        this.config = config;
    }

    Set getExisting() {
        String keyspace = config.getKeyspaceOrThrow();

        try {
            return clientPool.runWithRetry(new FunctionCheckedException, Exception>() {
                @Override
                public Set apply(CassandraClient client) throws Exception {
                    return getExisting(client, keyspace);
                }

                @Override
                public String toString() {
                    return "describe_keyspace(" + keyspace + ")";
                }
            });
        } catch (Exception e) {
            throw Throwables.throwUncheckedException(e);
        }
    }

    private Set getExisting(CassandraClient client, String keyspace) throws TException {
        return getTableNames(client, keyspace, CfDef::getName);
    }

    Stream getTableReferencesWithoutFiltering() {
        return getExisting().stream().map(TableReference::fromInternalTableName);
    }

    Set getExistingLowerCased() throws TException {
        return getExistingLowerCased(config.getKeyspaceOrThrow());
    }

    private Set getExistingLowerCased(String keyspace) throws TException {
        return clientPool.runWithRetry(client -> getExistingLowerCased(client, keyspace));
    }

    private Set getExistingLowerCased(CassandraClient client, String keyspace) throws TException {
        return getTableNames(client, keyspace, cf -> cf.getName().toLowerCase(Locale.ROOT));
    }

    private Set getTableNames(CassandraClient client, String keyspace, Function nameGetter)
            throws TException {
        try {
            CassandraKeyValueServices.waitForSchemaVersions(
                    config.schemaMutationTimeoutMillis(), client, "before making a call to get all table names.");
        } catch (IllegalStateException e) {
            throw new InsufficientConsistencyException(
                    "Could not reach a quorum of nodes agreeing on schema versions "
                            + "before making a call to get all table names.",
                    e);
        }

        KsDef ks = client.describe_keyspace(keyspace);

        return ks.getCf_defs().stream().map(nameGetter).collect(Collectors.toSet());
    }
}