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A Reactive Streams implementation of the MongoDB Java driver
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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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 com.mongodb.reactivestreams.client.internal;

import com.mongodb.ExplainVerbosity;
import com.mongodb.client.cursor.TimeoutMode;
import com.mongodb.client.model.Collation;
import com.mongodb.internal.TimeoutSettings;
import com.mongodb.internal.async.AsyncBatchCursor;
import com.mongodb.internal.operation.AsyncExplainableReadOperation;
import com.mongodb.internal.operation.AsyncOperations;
import com.mongodb.internal.operation.AsyncReadOperation;
import com.mongodb.lang.Nullable;
import com.mongodb.reactivestreams.client.ListSearchIndexesPublisher;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.Document;
import org.reactivestreams.Publisher;

import java.util.concurrent.TimeUnit;
import java.util.function.Function;

import static com.mongodb.assertions.Assertions.notNull;

final class ListSearchIndexesPublisherImpl extends BatchCursorPublisher implements ListSearchIndexesPublisher {
    @Nullable
    private Boolean allowDiskUse;
    private long maxTimeMS;
    @Nullable
    private Collation collation;
    @Nullable
    private BsonValue comment;
    @Nullable
    private String indexName;

    ListSearchIndexesPublisherImpl(
            final MongoOperationPublisher mongoOperationPublisher) {
        super(null, mongoOperationPublisher);
    }

    @Override
    public ListSearchIndexesPublisher name(final String indexName) {
        this.indexName = notNull("indexName", indexName);
        return this;
    }

    @Override
    public ListSearchIndexesPublisher allowDiskUse(@Nullable final Boolean allowDiskUse) {
        this.allowDiskUse = allowDiskUse;
        return this;
    }

    @Override
    public ListSearchIndexesPublisher batchSize(final int batchSize) {
        super.batchSize(batchSize);
        return this;
    }

    @Override
    public ListSearchIndexesPublisher maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

    @Override
    public ListSearchIndexesPublisher collation(@Nullable final Collation collation) {
        this.collation = collation;
        return this;
    }

    @Override
    public ListSearchIndexesPublisher comment(@Nullable final String comment) {
        this.comment = comment != null ? new BsonString(comment) : null;
        return this;
    }

    @Override
    public ListSearchIndexesPublisher timeoutMode(final TimeoutMode timeoutMode) {
        super.timeoutMode(timeoutMode);
        return this;
    }

    @Override
    public ListSearchIndexesPublisher comment(@Nullable final BsonValue comment) {
        this.comment = comment;
        return this;
    }

    @Override
    public Publisher explain() {
        return publishExplain(Document.class, null);
    }

    @Override
    public Publisher explain(final ExplainVerbosity verbosity) {
        notNull("verbosity", verbosity);

        return publishExplain(Document.class, verbosity);
    }

    @Override
    public  Publisher explain(final Class explainResultClass) {
        notNull("explainResultClass", explainResultClass);
        return publishExplain(explainResultClass, null);
    }

    @Override
    public  Publisher explain(final Class explainResultClass, final ExplainVerbosity verbosity) {
        notNull("verbosity", verbosity);
        notNull("explainResultClass", explainResultClass);
        return publishExplain(explainResultClass, verbosity);
    }

    private  Publisher publishExplain(final Class explainResultClass, @Nullable final ExplainVerbosity verbosity) {
        return getMongoOperationPublisher().createReadOperationMono(
                (asyncOperations -> asyncOperations.createTimeoutSettings(maxTimeMS)),
                () -> asAggregateOperation(1).asAsyncExplainableOperation(verbosity,
                        getCodecRegistry().get(explainResultClass)), getClientSession());
    }

    @Override
    AsyncReadOperation> asAsyncReadOperation(final int initialBatchSize) {
        return asAggregateOperation(initialBatchSize);
    }

    @Override
    Function, TimeoutSettings> getTimeoutSettings() {
        return  (asyncOperations -> asyncOperations.createTimeoutSettings(maxTimeMS));
    }

    private AsyncExplainableReadOperation> asAggregateOperation(final int initialBatchSize) {
        return getOperations().listSearchIndexes(getDocumentClass(), indexName, initialBatchSize, collation, comment, allowDiskUse);
    }
}