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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.CursorType;
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.client.model.FindOptions;
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.ClientSession;
import com.mongodb.reactivestreams.client.FindPublisher;
import org.bson.BsonValue;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.reactivestreams.Publisher;

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

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

final class FindPublisherImpl extends BatchCursorPublisher implements FindPublisher {
    private final FindOptions findOptions;

    private Bson filter;

    FindPublisherImpl(@Nullable final ClientSession clientSession, final MongoOperationPublisher mongoOperationPublisher,
            final Bson filter) {
        super(clientSession, mongoOperationPublisher);
        this.filter = notNull("filter", filter);
        this.findOptions = new FindOptions();
    }

    @Override
    public FindPublisher filter(@Nullable final Bson filter) {
        this.filter = filter;
        return this;
    }

    @Override
    public FindPublisher limit(final int limit) {
        findOptions.limit(limit);
        return this;
    }

    @Override
    public FindPublisher skip(final int skip) {
        findOptions.skip(skip);
        return this;
    }

    @Override
    public FindPublisher maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        findOptions.maxTime(maxTime, timeUnit);
        return this;
    }

    @Override
    public FindPublisher maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
        validateMaxAwaitTime(maxAwaitTime, timeUnit);
        findOptions.maxAwaitTime(maxAwaitTime, timeUnit);
        return this;
    }

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

    @Override
    public FindPublisher collation(@Nullable final Collation collation) {
        findOptions.collation(collation);
        return this;
    }

    @Override
    public FindPublisher projection(@Nullable final Bson projection) {
        findOptions.projection(projection);
        return this;
    }

    @Override
    public FindPublisher sort(@Nullable final Bson sort) {
        findOptions.sort(sort);
        return this;
    }

    @Override
    public FindPublisher noCursorTimeout(final boolean noCursorTimeout) {
        findOptions.noCursorTimeout(noCursorTimeout);
        return this;
    }

    @Override
    public FindPublisher partial(final boolean partial) {
        findOptions.partial(partial);
        return this;
    }

    @Override
    public FindPublisher cursorType(final CursorType cursorType) {
        findOptions.cursorType(cursorType);
        return this;
    }

    @Override
    public FindPublisher comment(@Nullable final String comment) {
        findOptions.comment(comment);
        return this;
    }

    @Override
    public FindPublisher comment(@Nullable final BsonValue comment) {
        findOptions.comment(comment);
        return this;
    }

    @Override
    public FindPublisher hint(@Nullable final Bson hint) {
        findOptions.hint(hint);
        return this;
    }

    @Override
    public FindPublisher hintString(@Nullable final String hint) {
        findOptions.hintString(hint);
        return this;
    }

    @Override
    public FindPublisher let(@Nullable final Bson variables) {
        findOptions.let(variables);
        return this;
    }

    @Override
    public FindPublisher max(@Nullable final Bson max) {
        findOptions.max(max);
        return this;
    }

    @Override
    public FindPublisher min(@Nullable final Bson min) {
        findOptions.min(min);
        return this;
    }

    @Override
    public FindPublisher returnKey(final boolean returnKey) {
        findOptions.returnKey(returnKey);
        return this;
    }

    @Override
    public FindPublisher showRecordId(final boolean showRecordId) {
        findOptions.showRecordId(showRecordId);
        return this;
    }

    @Override
    public FindPublisher allowDiskUse(@Nullable final Boolean allowDiskUse) {
        findOptions.allowDiskUse(allowDiskUse);
        return this;
    }

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

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

    @Override
    public Publisher explain(final ExplainVerbosity verbosity) {
        return publishExplain(Document.class, notNull("verbosity", verbosity));
    }

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

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

    private  Publisher publishExplain(final Class explainResultClass, @Nullable final ExplainVerbosity verbosity) {
        notNull("explainDocumentClass", explainResultClass);
        return getMongoOperationPublisher().createReadOperationMono(
                getTimeoutSettings(),
                () -> asAsyncReadOperation(0)
                        .asAsyncExplainableOperation(verbosity, getCodecRegistry().get(explainResultClass)), getClientSession());
    }

    @Override
    AsyncExplainableReadOperation> asAsyncReadOperation(final int initialBatchSize) {
        return getOperations().find(filter, getDocumentClass(), findOptions.withBatchSize(initialBatchSize));
    }

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

    @Override
    AsyncReadOperation> asAsyncFirstReadOperation() {
        return getOperations().findFirst(filter, getDocumentClass(), findOptions);
    }
}