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/*
 * Copyright 2013-2019 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
 *
 *   https://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.support;

import static org.springframework.data.cassandra.core.query.Criteria.*;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;

import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.CassandraTemplate;
import org.springframework.data.cassandra.core.InsertOptions;
import org.springframework.data.cassandra.core.query.Query;
import org.springframework.data.cassandra.repository.CassandraRepository;
import org.springframework.data.cassandra.repository.query.CassandraEntityInformation;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Slice;
import org.springframework.util.Assert;

import com.datastax.driver.core.querybuilder.Insert;
import com.datastax.driver.core.querybuilder.QueryBuilder;
import com.datastax.driver.core.querybuilder.Select;

/**
 * Repository base implementation for Cassandra.
 *
 * @author Alex Shvid
 * @author Matthew T. Adams
 * @author Mark Paluch
 * @see org.springframework.data.cassandra.repository.CassandraRepository
 */
public class SimpleCassandraRepository implements CassandraRepository {

	private static final InsertOptions INSERT_NULLS = InsertOptions.builder().withInsertNulls().build();

	private final CassandraEntityInformation entityInformation;

	private final CassandraOperations operations;

	/**
	 * Create a new {@link SimpleCassandraRepository} for the given {@link CassandraEntityInformation} and
	 * {@link CassandraTemplate}.
	 *
	 * @param metadata must not be {@literal null}.
	 * @param operations must not be {@literal null}.
	 */
	public SimpleCassandraRepository(CassandraEntityInformation metadata, CassandraOperations operations) {

		Assert.notNull(metadata, "CassandraEntityInformation must not be null");
		Assert.notNull(operations, "CassandraOperations must not be null");

		this.entityInformation = metadata;
		this.operations = operations;
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#save(S)
	 */
	@Override
	public  S save(S entity) {

		Assert.notNull(entity, "Entity must not be null");

		return operations.insert(entity, INSERT_NULLS).getEntity();
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#saveAll(java.lang.Iterable)
	 */
	@Override
	public  List saveAll(Iterable entities) {

		Assert.notNull(entities, "The given Iterable of entities must not be null");

		List result = new ArrayList<>();

		for (S entity : entities) {
			result.add(operations.insert(entity, INSERT_NULLS).getEntity());
		}

		return result;
	}

	/**
	 * Create a {@link Insert} statement containing all properties including these with {@literal null} values.
	 *
	 * @param entity the entity, must not be {@literal null}.
	 * @return the constructed {@link Insert} statement.
	 * @deprecated since 2.1, use {@link InsertOptions#isInsertNulls()} with
	 *             {@link CassandraOperations#insert(Object, InsertOptions)}.
	 */
	protected  Insert createInsert(S entity) {
		return InsertUtil.createInsert(operations.getConverter(), entity);
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.cassandra.repository.TypedIdCassandraRepository#insert(java.lang.Object)
	 */
	@Override
	public  S insert(S entity) {

		Assert.notNull(entity, "Entity must not be null");

		return operations.insert(entity);
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.cassandra.repository.TypedIdCassandraRepository#insert(java.lang.Iterable)
	 */
	@Override
	public  List insert(Iterable entities) {

		Assert.notNull(entities, "The given Iterable of entities must not be null");

		List result = new ArrayList<>();

		for (S entity : entities) {
			result.add(operations.insert(entity));
		}

		return result;
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#findById(java.lang.Object)
	 */
	@Override
	public Optional findById(ID id) {

		Assert.notNull(id, "The given id must not be null");

		return Optional.ofNullable(doFindOne(id));
	}

	private T doFindOne(ID id) {
		return this.operations.selectOneById(id, this.entityInformation.getJavaType());
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#existsById(java.lang.Object)
	 */
	@Override
	public boolean existsById(ID id) {

		Assert.notNull(id, "The given id must not be null");

		return operations.exists(id, entityInformation.getJavaType());
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#count()
	 */
	@Override
	public long count() {
		return operations.count(entityInformation.getJavaType());
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#findAll()
	 */
	@Override
	public List findAll() {

		Select select = QueryBuilder.select().all().from(entityInformation.getTableName().toCql());

		return operations.select(select, entityInformation.getJavaType());
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.CrudRepository#findAll(java.lang.Iterable)
	 */
	@Override
	public List findAllById(Iterable ids) {

		Assert.notNull(ids, "The given Iterable of id's must not be null");

		FindByIdQuery mapIdQuery = FindByIdQuery.forIds(ids);
		List