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/*
 * Copyright 2015-2019 Futeh Kao
 *
 * 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.e6tech.elements.cassandra.driver.v4;

import com.datastax.oss.driver.api.core.CqlIdentifier;
import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.mapper.MapperBuilder;
import com.datastax.oss.driver.internal.core.util.concurrent.LazyReference;
import com.datastax.oss.driver.internal.mapper.DefaultMapperContext;
import net.e6tech.elements.cassandra.SessionProvider;
import net.e6tech.elements.cassandra.etl.Inspector;
import org.ehcache.impl.internal.concurrent.ConcurrentHashMap;

import java.util.concurrent.ConcurrentMap;

public class MappingManager {
    protected final SessionProvider sessionProvider;
    protected final CqlSession session;
    private String keyspace;
    private ConcurrentMap builders = new ConcurrentHashMap<>();

    public MappingManager(SessionProvider sessionProvider, CqlSession session, String keyspace) {
        this.sessionProvider = sessionProvider;
        this.session = session;
        this.keyspace = keyspace;
        if (keyspace == null)
            this.keyspace = session.getKeyspace().map(CqlIdentifier::asInternal).orElse(null);
    }

    @SuppressWarnings("unchecked")
    public  Mapper getMapper(Class cls) {
        MyMapperBuilder builder = builders.computeIfAbsent(cls, key -> {
            MyMapperBuilder b = new MyMapperBuilder(session);
            return b.build(cls, keyspace);
        });
        return builder.getMapper();
    }

    public String getKeyspace() {
        return keyspace;
    }


    @SuppressWarnings("unchecked")
    private class MyMapperBuilder extends MapperBuilder {
        private LazyReference> cache;

        protected MyMapperBuilder(CqlSession session) {
            super(session);
        }

        // Don't care, we don't use it.
        @Override
        public T build() {
            return null;
        }

        public MyMapperBuilder build(Class cls, String keyspace) {
            Inspector inspector = sessionProvider.getInspector(cls);
            CqlIdentifier tableId = CqlIdentifier.fromInternal(inspector.tableName());
            CqlIdentifier keyspaceId = CqlIdentifier.fromInternal(keyspace);
            DefaultMapperContext context = new DefaultMapperContext(session, defaultKeyspaceId, defaultExecutionProfileName, defaultExecutionProfile, customState)
                    .withDaoParameters(keyspaceId, tableId, null, null);
            this.cache = new LazyReference<>(() -> MapperImpl.init(context, cls, inspector));
            return this;
        }

        public Mapper getMapper() {
            return cache.get();
        }
    }
}