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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.client.internal;

import com.mongodb.MongoNamespace;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.client.ChangeStreamIterable;
import com.mongodb.client.ClientSession;
import com.mongodb.client.MongoIterable;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.changestream.ChangeStreamDocument;
import com.mongodb.client.model.changestream.ChangeStreamLevel;
import com.mongodb.client.model.changestream.FullDocument;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.BatchCursor;
import com.mongodb.operation.ChangeStreamOperation;
import com.mongodb.operation.ReadOperation;
import org.bson.BsonDocument;
import org.bson.BsonTimestamp;
import org.bson.codecs.Codec;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

/**
 * This class is NOT part of the public API. It may change at any time without notification.
 */
class ChangeStreamIterableImpl extends MongoIterableImpl> implements ChangeStreamIterable {
    private final MongoNamespace namespace;
    private final CodecRegistry codecRegistry;
    private final List pipeline;
    private final Codec> codec;
    private final ChangeStreamLevel changeStreamLevel;

    private FullDocument fullDocument = FullDocument.DEFAULT;
    private BsonDocument resumeToken;
    private long maxAwaitTimeMS;
    private Collation collation;
    private BsonTimestamp startAtOperationTime;

    ChangeStreamIterableImpl(@Nullable final ClientSession clientSession, final String databaseName,
                             final CodecRegistry codecRegistry, final ReadPreference readPreference, final ReadConcern readConcern,
                             final OperationExecutor executor, final List pipeline, final Class resultClass,
                             final ChangeStreamLevel changeStreamLevel) {
        this(clientSession, new MongoNamespace(databaseName, "ignored"), codecRegistry, readPreference, readConcern, executor, pipeline,
                resultClass, changeStreamLevel);
    }

    ChangeStreamIterableImpl(@Nullable final ClientSession clientSession, final MongoNamespace namespace,
                             final CodecRegistry codecRegistry, final ReadPreference readPreference, final ReadConcern readConcern,
                             final OperationExecutor executor, final List pipeline, final Class resultClass,
                             final ChangeStreamLevel changeStreamLevel) {
        super(clientSession, executor, readConcern, readPreference);
        this.namespace = notNull("namespace", namespace);
        this.codecRegistry = notNull("codecRegistry", codecRegistry);
        this.pipeline = notNull("pipeline", pipeline);
        this.codec = ChangeStreamDocument.createCodec(notNull("resultClass", resultClass), codecRegistry);
        this.changeStreamLevel = notNull("changeStreamLevel", changeStreamLevel);
    }

    @Override
    public ChangeStreamIterable fullDocument(final FullDocument fullDocument) {
        this.fullDocument = notNull("fullDocument", fullDocument);
        return this;
    }

    @Override
    public ChangeStreamIterable resumeAfter(final BsonDocument resumeAfter) {
        this.resumeToken = notNull("resumeAfter", resumeAfter);
        return this;
    }

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

    @Override
    public ChangeStreamIterable maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxAwaitTimeMS = MILLISECONDS.convert(maxAwaitTime, timeUnit);
        return this;
    }

    @Override
    public ChangeStreamIterable collation(@Nullable final Collation collation) {
        this.collation = notNull("collation", collation);
        return this;
    }

    @Override
    public  MongoIterable withDocumentClass(final Class clazz) {
        return new MongoIterableImpl(getClientSession(), getExecutor(), getReadConcern(), getReadPreference()) {
            private ReadOperation> operation = createChangeStreamOperation(codecRegistry.get(clazz));

            @Override
            public ReadOperation> asReadOperation() {
                return operation;
            }
        };
    }

    @Override
    public ChangeStreamIterable startAtOperationTime(final BsonTimestamp startAtOperationTime) {
        this.startAtOperationTime = notNull("startAtOperationTime", startAtOperationTime);
        return this;
    }

    @Override
    public ReadOperation>> asReadOperation() {
        return createChangeStreamOperation(codec);
    }

    private  ReadOperation> createChangeStreamOperation(final Codec codec) {
        return new ChangeStreamOperation(namespace, fullDocument,  createBsonDocumentList(pipeline), codec, changeStreamLevel)
                        .batchSize(getBatchSize())
                        .collation(collation)
                        .maxAwaitTime(maxAwaitTimeMS, MILLISECONDS)
                        .resumeAfter(resumeToken)
                        .startAtOperationTime(startAtOperationTime);
    }

    private List createBsonDocumentList(final List pipeline) {
        List aggregateList = new ArrayList(pipeline.size());
        for (Bson obj : pipeline) {
            if (obj == null) {
                throw new IllegalArgumentException("pipeline cannot contain a null value");
            }
            aggregateList.add(obj.toBsonDocument(BsonDocument.class, codecRegistry));
        }
        return aggregateList;
    }
}