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/*
 * 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 io.trino.plugin.hive.metastore;

import com.google.inject.Binder;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.Singleton;
import io.airlift.configuration.AbstractConfigurationAwareModule;
import io.trino.plugin.hive.fs.DirectoryLister;
import io.trino.plugin.hive.metastore.cache.CachingHiveMetastore;
import io.trino.plugin.hive.metastore.cache.CachingHiveMetastoreConfig;
import io.trino.plugin.hive.metastore.cache.ImpersonationCachingConfig;
import io.trino.plugin.hive.metastore.cache.SharedHiveMetastoreCache;
import io.trino.plugin.hive.metastore.cache.SharedHiveMetastoreCache.CachingHiveMetastoreFactory;
import io.trino.plugin.hive.metastore.glue.GlueCache;
import io.trino.plugin.hive.procedure.FlushMetadataCacheProcedure;
import io.trino.spi.procedure.Procedure;

import java.util.Optional;

import static com.google.inject.multibindings.Multibinder.newSetBinder;
import static com.google.inject.multibindings.OptionalBinder.newOptionalBinder;
import static io.airlift.configuration.ConfigBinder.configBinder;
import static org.weakref.jmx.guice.ExportBinder.newExporter;

public class CachingHiveMetastoreModule
        extends AbstractConfigurationAwareModule
{
    private final boolean installFlushMetadataCacheProcedure;

    public CachingHiveMetastoreModule(boolean installFlushMetadataCacheProcedure)
    {
        this.installFlushMetadataCacheProcedure = installFlushMetadataCacheProcedure;
    }

    @Override
    protected void setup(Binder binder)
    {
        configBinder(binder).bindConfig(CachingHiveMetastoreConfig.class);
        // TODO this should only be bound when impersonation is actually enabled
        configBinder(binder).bindConfig(ImpersonationCachingConfig.class);
        binder.bind(SharedHiveMetastoreCache.class).in(Scopes.SINGLETON);
        // export under the old name, for backwards compatibility
        newExporter(binder).export(HiveMetastoreFactory.class)
                .as(generator -> generator.generatedNameOf(CachingHiveMetastore.class));

        if (installFlushMetadataCacheProcedure) {
            newOptionalBinder(binder, GlueCache.class);
            newOptionalBinder(binder, DirectoryLister.class);
            newSetBinder(binder, Procedure.class).addBinding().toProvider(FlushMetadataCacheProcedure.class).in(Scopes.SINGLETON);
        }
    }

    @Provides
    @Singleton
    public static HiveMetastoreFactory createHiveMetastore(
            @RawHiveMetastoreFactory HiveMetastoreFactory metastoreFactory,
            SharedHiveMetastoreCache sharedHiveMetastoreCache)
    {
        // cross TX metastore cache is enabled wrapper with caching metastore
        return sharedHiveMetastoreCache.createCachingHiveMetastoreFactory(metastoreFactory);
    }

    @Provides
    @Singleton
    public static Optional createHiveMetastore(HiveMetastoreFactory metastoreFactory)
    {
        if (metastoreFactory instanceof CachingHiveMetastoreFactory) {
            return Optional.of(((CachingHiveMetastoreFactory) metastoreFactory).getMetastore());
        }
        return Optional.empty();
    }
}