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/*
 * Copyright 2017-2021 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.operations.reactive;

import io.micronaut.core.annotation.Experimental;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.runtime.DeleteBatchOperation;
import io.micronaut.data.model.runtime.DeleteOperation;
import io.micronaut.data.model.runtime.InsertBatchOperation;
import io.micronaut.data.model.runtime.InsertOperation;
import io.micronaut.data.model.runtime.PagedQuery;
import io.micronaut.data.model.runtime.PreparedQuery;
import io.micronaut.data.model.runtime.UpdateBatchOperation;
import io.micronaut.data.model.runtime.UpdateOperation;
import io.micronaut.data.operations.RepositoryOperations;
import reactor.core.publisher.Mono;

import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Stream;

/**
 * Implementation of {@link RepositoryOperations} that blocks every call from {@link ReactorReactiveRepositoryOperations}.
 *
 * @author Denis Stepanov
 * @since 3.3.0
 */
@Experimental
public interface BlockingExecutorReactorRepositoryOperations extends RepositoryOperations, ReactorReactiveCapableRepository {

     T block(Function> supplier);

     Optional blockOptional(Function> supplier);

    @Override
    @Nullable
    default  T findOne(@NonNull Class type, @NonNull Object id) {
        return block(reactive -> reactive.findOne(type, id));
    }

    @Nullable
    @Override
    default  R findOne(@NonNull PreparedQuery preparedQuery) {
        return block(reactive -> reactive.findOne(preparedQuery));
    }

    @NonNull
    @Override
    default  Iterable findAll(@NonNull PreparedQuery preparedQuery) {
        return block(reactive -> reactive.findAll(preparedQuery).collectList());
    }

    @NonNull
    @Override
    default  Stream findStream(@NonNull PreparedQuery preparedQuery) {
        return block(reactive -> reactive.findAll(preparedQuery).collectList()).stream();
    }

    @NonNull
    @Override
    default  T persist(@NonNull InsertOperation operation) {
        return blockOptional(reactive -> reactive.persist(operation)).orElseGet(operation::getEntity);
    }

    @NonNull
    @Override
    default  T update(@NonNull UpdateOperation operation) {
        return blockOptional(reactive -> reactive.update(operation)).orElseGet(operation::getEntity);
    }

    @Override
    default  Iterable updateAll(UpdateBatchOperation operation) {
        return blockOptional(reactive -> reactive.updateAll(operation).collectList().>map(it -> it)).orElse(operation);
    }

    @NonNull
    @Override
    default  Iterable persistAll(@NonNull InsertBatchOperation operation) {
        return blockOptional(reactive -> reactive.persistAll(operation).collectList().>map(it -> it)).orElse(operation);
    }

    @NonNull
    @Override
    default Optional executeUpdate(@NonNull PreparedQuery preparedQuery) {
        return blockOptional(reactive -> reactive.executeUpdate(preparedQuery));
    }

    @Override
    default Optional executeDelete(@NonNull PreparedQuery preparedQuery) {
        return blockOptional(reactive -> reactive.executeDelete(preparedQuery));
    }

    @Override
    default  List execute(PreparedQuery preparedQuery) {
        return block(reactive -> reactive.execute(preparedQuery).collectList());
    }

    @Override
    default  int delete(@NonNull DeleteOperation operation) {
        return blockOptional(reactive -> reactive.delete(operation)).orElse(0).intValue();
    }

    @Override
    default  Optional deleteAll(@NonNull DeleteBatchOperation operation) {
        return blockOptional(reactive -> reactive.deleteAll(operation));
    }

    @Override
    default  boolean exists(@NonNull PreparedQuery preparedQuery) {
        return blockOptional(reactive -> reactive.exists(preparedQuery)).orElse(false);
    }

    @Override
    default  Page findPage(@NonNull PagedQuery query) {
        return block(reactive -> reactive.findPage(query));
    }

    @NonNull
    @Override
    default  Iterable findAll(@NonNull PagedQuery query) {
        return block(reactive -> reactive.findAll(query).collectList());
    }

    @Override
    default  long count(PagedQuery pagedQuery) {
        return blockOptional(reactive -> reactive.count(pagedQuery)).orElse(0L);
    }

    @NonNull
    @Override
    default  Stream findStream(@NonNull PagedQuery query) {
        return block(reactive -> reactive.findAll(query).collectList()).stream();
    }
}