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/*
 * Copyright 2017-2019 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.runtime.intercept.async;

import edu.umd.cs.findbugs.annotations.NonNull;
import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.type.Argument;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.intercept.async.FindOneAsyncInterceptor;
import io.micronaut.data.model.runtime.PreparedQuery;

import java.util.concurrent.CompletionStage;

/**
 * Default implementation of the {@link FindOneAsyncInterceptor} interface.
 *
 * @param  The declaring type.
 */
public class DefaultFindOneAsyncInterceptor extends AbstractAsyncInterceptor implements FindOneAsyncInterceptor {
    /**
     * Default constructor.
     *
     * @param datastore The operations
     */
    protected DefaultFindOneAsyncInterceptor(@NonNull RepositoryOperations datastore) {
        super(datastore);
    }

    @SuppressWarnings("unchecked")
    @Override
    public CompletionStage intercept(RepositoryMethodKey methodKey, MethodInvocationContext> context) {
        PreparedQuery preparedQuery = (PreparedQuery) prepareQuery(methodKey, context);
        CompletionStage future = asyncDatastoreOperations.findOne(preparedQuery);
        Argument type = context.getReturnType().asArgument().getFirstTypeVariable().orElse(Argument.OBJECT_ARGUMENT);
        return future.thenApply(o -> {
            if (!type.getType().isInstance(o)) {
                return ConversionService.SHARED.convert(o, type)
                        .orElseThrow(() -> new IllegalStateException("Unexpected return type: " + o));
            }
            return o;
        });
    }
}