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/**
 * Copyright 2009 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 net.javacrumbs.shedlock.provider.cassandra;

import static java.util.Objects.requireNonNull;

import com.datastax.oss.driver.api.core.ConsistencyLevel;
import com.datastax.oss.driver.api.core.CqlIdentifier;
import com.datastax.oss.driver.api.core.CqlSession;
import net.javacrumbs.shedlock.support.StorageBasedLockProvider;
import net.javacrumbs.shedlock.support.annotation.NonNull;

/**
 * Cassandra Lock Provider needs a keyspace and uses a lock table 

 * Example creating keyspace and table
 *
 * 
 * CREATE KEYSPACE shedlock with replication={'class':'SimpleStrategy', 'replication_factor':1} and durable_writes=true;
 * CREATE TABLE shedlock.lock (name text PRIMARY KEY, lockUntil timestamp, lockedAt timestamp, lockedBy text);
 * 
 */
public class CassandraLockProvider extends StorageBasedLockProvider {
    static final String DEFAULT_TABLE = "lock";

    public CassandraLockProvider(@NonNull CqlSession cqlSession) {
        this(cqlSession, DEFAULT_TABLE, ConsistencyLevel.QUORUM);
    }

    public CassandraLockProvider(
            @NonNull CqlSession cqlSession, @NonNull String table, @NonNull ConsistencyLevel consistencyLevel) {
        this(Configuration.builder()
                .withCqlSession(cqlSession)
                .withTableName(table)
                .withConsistencyLevel(consistencyLevel)
                .build());
    }

    public CassandraLockProvider(@NonNull Configuration configuration) {
        super(new CassandraStorageAccessor(configuration));
    }

    /** Convenience class to specify configuration */
    public static final class Configuration {
        private final CqlIdentifier table;
        private final ColumnNames columnNames;
        private final CqlSession cqlSession;
        private final ConsistencyLevel consistencyLevel;
        private final ConsistencyLevel serialConsistencyLevel;
        private final CqlIdentifier keyspace;

        Configuration(
                @NonNull CqlSession cqlSession,
                @NonNull CqlIdentifier table,
                @NonNull ColumnNames columnNames,
                @NonNull ConsistencyLevel consistencyLevel,
                @NonNull ConsistencyLevel serialConsistencyLevel,
                CqlIdentifier keyspace) {
            this.table = requireNonNull(table, "table can not be null");
            this.columnNames = requireNonNull(columnNames, "columnNames can not be null");
            this.cqlSession = requireNonNull(cqlSession, "cqlSession can not be null");
            this.consistencyLevel = requireNonNull(consistencyLevel, "consistencyLevel can not be null");
            this.serialConsistencyLevel =
                    requireNonNull(serialConsistencyLevel, "serialConsistencyLevel can not be null");
            this.keyspace = keyspace;
        }

        public ColumnNames getColumnNames() {
            return columnNames;
        }

        public CqlIdentifier getTable() {
            return table;
        }

        public CqlSession getCqlSession() {
            return cqlSession;
        }

        public ConsistencyLevel getConsistencyLevel() {
            return consistencyLevel;
        }

        public ConsistencyLevel getSerialConsistencyLevel() {
            return serialConsistencyLevel;
        }

        public CqlIdentifier getKeyspace() {
            return keyspace;
        }

        public static Configuration.Builder builder() {
            return new Configuration.Builder();
        }

        /** Convenience builder class to build Configuration */
        public static final class Builder {
            private CqlIdentifier table = CqlIdentifier.fromCql(DEFAULT_TABLE);
            private ColumnNames columnNames = new ColumnNames("name", "lockUntil", "lockedAt", "lockedBy");
            private CqlSession cqlSession;
            private ConsistencyLevel consistencyLevel = ConsistencyLevel.QUORUM;
            private ConsistencyLevel serialConsistencyLevel = ConsistencyLevel.SERIAL;
            private CqlIdentifier keyspace;

            public Builder withTableName(@NonNull String table) {
                return withTableName(CqlIdentifier.fromCql(table));
            }

            public Builder withTableName(@NonNull CqlIdentifier table) {
                this.table = table;
                return this;
            }

            public Builder withColumnNames(ColumnNames columnNames) {
                this.columnNames = columnNames;
                return this;
            }

            public Builder withCqlSession(@NonNull CqlSession cqlSession) {
                this.cqlSession = cqlSession;
                return this;
            }

            public Builder withConsistencyLevel(@NonNull ConsistencyLevel consistencyLevel) {
                this.consistencyLevel = consistencyLevel;
                return this;
            }

            /**
             * Since Shedlock internally uses CAS (Compare And Set) operations This
             * configuration helps to have a granular control on the CAS consistency.
             *
             * @return Builder
             */
            public Builder withSerialConsistencyLevel(@NonNull ConsistencyLevel serialConsistencyLevel) {
                this.serialConsistencyLevel = serialConsistencyLevel;
                return this;
            }

            public Builder withKeyspace(@NonNull CqlIdentifier keyspace) {
                this.keyspace = keyspace;
                return this;
            }

            public CassandraLockProvider.Configuration build() {
                return new CassandraLockProvider.Configuration(
                        cqlSession, table, columnNames, consistencyLevel, serialConsistencyLevel, keyspace);
            }
        }
    }

    /** Convenience class to specify column names */
    public static final class ColumnNames {
        private final String lockName;
        private final String lockUntil;
        private final String lockedAt;
        private final String lockedBy;

        /**
         * Each column names are optional and if not specified the default column name
         * would be considered.
         */
        public ColumnNames(String lockName, String lockUntil, String lockedAt, String lockedBy) {
            this.lockName = requireNonNull(lockName, "'lockName' column name can not be null");
            this.lockUntil = requireNonNull(lockUntil, "'lockUntil' column name can not be null");
            this.lockedAt = requireNonNull(lockedAt, "'lockedAt' column name can not be null");
            this.lockedBy = requireNonNull(lockedBy, "'lockedBy' column name can not be null");
        }

        public String getLockName() {
            return lockName;
        }

        public String getLockUntil() {
            return lockUntil;
        }

        public String getLockedAt() {
            return lockedAt;
        }

        public String getLockedBy() {
            return lockedBy;
        }
    }
}