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/*
 * Copyright 2017-2020 original 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 io.micronaut.data.repository.reactive;

import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.async.annotation.SingleResult;
import io.micronaut.data.repository.GenericRepository;
import org.reactivestreams.Publisher;

/**
 * Interface for CRUD using Reactive Streams.
 *
 * @param  The entity type
 * @param  The ID type
 *
 * @author graemerocher
 * @since 1.0.0
 */
public interface ReactiveStreamsCrudRepository extends GenericRepository {
    /**
     * Saves the given valid entity, returning a possibly new entity representing the saved state.
     *
     * @param entity The entity to save. Must not be {@literal null}.
     * @return The saved entity will never be {@literal null}.
     * @param  The generic type
     */
    @NonNull
    @SingleResult
     Publisher save(@NonNull S entity);

    /**
     * Saves all given entities, possibly returning new instances representing the saved state.
     *
     * @param entities The entities to save. Must not be {@literal null}.
     * @param  The generic type
     * @return The saved entities objects. will never be {@literal null}.
     */
    @NonNull
     Publisher saveAll(@NonNull Iterable entities);

    /**
     * This method issues an explicit update for the given entity. The method differs from {@link #save(Object)} in that an update will be generated regardless if the entity has been saved previously or not. If the entity has no assigned ID then an exception will be thrown.
     *
     * @param entity The entity to update. Must not be {@literal null}.
     * @return The updated entity will never be {@literal null}.
     * @param  The generic type
     */
    @NonNull
     Publisher update(@NonNull S entity);

    /**
     * This method issues an explicit update for the given entities. The method differs from {@link #saveAll(Iterable)} in that an update will be generated regardless if the entity has been saved previously or not. If the entity has no assigned ID then an exception will be thrown.
     *
     * @param entities The entities to update. Must not be {@literal null}.
     * @return The updated entities will never be {@literal null}.
     * @param  The generic type
     */
    @NonNull
     Publisher updateAll(@NonNull Iterable entities);

    /**
     * Retrieves an entity by its id.
     *
     * @param id The ID of the entity to retrieve. Must not be {@literal null}.
     * @return the entity with the given id or {@literal Optional#empty()} if none found
     */
    @NonNull
    @SingleResult
    Publisher findById(@NonNull ID id);

    /**
     * Returns whether an entity with the given id exists.
     *
     * @param id must not be {@literal null}.
     * @return {@literal true} if an entity with the given id exists, {@literal false} otherwise.
     */
    @SingleResult
    @NonNull Publisher existsById(@NonNull ID id);

    /**
     * Returns all instances of the type.
     *
     * @return all entities
     */
    @NonNull Publisher findAll();

    /**
     * Returns the number of entities available.
     *
     * @return the number of entities
     */
    @SingleResult
    @NonNull Publisher count();

    /**
     * Deletes the entity with the given id.
     *
     * @param id must not be {@literal null}.
     * @return A future that executes the delete operation
     */
    @NonNull
    @SingleResult
    Publisher deleteById(@NonNull ID id);

    /**
     * Deletes a given entity.
     *
     * @param entity The entity to delete
     * @return A future that executes the delete operation
     */
    @SingleResult
    @NonNull Publisher delete(@NonNull E entity);

    /**
     * Deletes the given entities.
     *
     * @param entities The entities to delete
     * @return A future that executes the delete operation
     */
    @SingleResult
    @NonNull Publisher deleteAll(@NonNull Iterable entities);

    /**
     * Deletes all entities managed by the repository.
     * @return A future that executes the delete operation
     */
    @NonNull Publisher deleteAll();
}