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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.springframework.data.cassandra.repository.query;

import java.util.List;

import lombok.NonNull;
import lombok.RequiredArgsConstructor;

import org.springframework.core.convert.converter.Converter;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentEntity;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentProperty;
import org.springframework.data.cassandra.core.query.CassandraPageRequest;
import org.springframework.data.convert.EntityInstantiators;
import org.springframework.data.domain.Pageable;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.repository.query.ResultProcessor;
import org.springframework.data.repository.query.ReturnedType;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;

import com.datastax.driver.core.Statement;

/**
 * Query executions for Cassandra.
 *
 * @author Mark Paluch
 * @since 1.5
 */
@FunctionalInterface
interface CassandraQueryExecution {

	@Nullable
	Object execute(Statement statement, Class type);

	/**
	 * {@link CassandraQueryExecution} for a Stream.
	 *
	 * @author Mark Paluch
	 */
	@RequiredArgsConstructor
	final class StreamExecution implements CassandraQueryExecution {

		private final @NonNull CassandraOperations operations;
		private final @NonNull Converter resultProcessing;

		/* (non-Javadoc)
		 * @see org.springframework.data.cassandra.repository.query.CassandraQueryExecution#execute(java.lang.String, java.lang.Class)
		 */
		@Override
		public Object execute(Statement statement, Class type) {
			return operations.stream(statement, type).map(resultProcessing::convert);
		}
	}

	/**
	 * {@link CassandraQueryExecution} for a {@link Slice}.
	 *
	 * @author Mark Paluch
	 */
	@RequiredArgsConstructor
	final class SlicedExecution implements CassandraQueryExecution {

		private final @NonNull CassandraOperations operations;
		private final @NonNull Pageable pageable;

		/* (non-Javadoc)
		 * @see org.springframework.data.cassandra.repository.query.CassandraQueryExecution#execute(java.lang.String, java.lang.Class)
		 */
		@Override
		public Object execute(Statement statement, Class type) {

			CassandraPageRequest.validatePageable(pageable);

			Statement statementToUse = statement.setFetchSize(pageable.getPageSize());

			if (pageable instanceof CassandraPageRequest) {
				statementToUse = statementToUse.setPagingState(((CassandraPageRequest) pageable).getPagingState());
			}

			return operations.slice(statementToUse, type);
		}
	}

	/**
	 * {@link CassandraQueryExecution} for collection returning queries.
	 *
	 * @author Mark Paluch
	 */
	@RequiredArgsConstructor
	final class CollectionExecution implements CassandraQueryExecution {

		private final @NonNull CassandraOperations operations;

		/* (non-Javadoc)
		 * @see org.springframework.data.cassandra.repository.query.CassandraQueryExecution#execute(java.lang.String, java.lang.Class)
		 */
		@Override
		public Object execute(Statement statement, Class type) {
			return operations.select(statement, type);
		}
	}

	/**
	 * {@link CassandraQueryExecution} to return a single entity.
	 *
	 * @author Mark Paluch
	 */
	@RequiredArgsConstructor
	final class SingleEntityExecution implements CassandraQueryExecution {

		private final @NonNull CassandraOperations operations;
		private final boolean limiting;

		/* (non-Javadoc)
		 * @see org.springframework.data.cassandra.repository.query.CassandraQueryExecution#execute(java.lang.String, java.lang.Class)
		 */
		@Override
		@SuppressWarnings("unchecked")
		public Object execute(Statement statement, Class type) {

			List