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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.WriteConcern;
import com.mongodb.client.ClientSession;
import com.mongodb.client.model.Collation;
import com.mongodb.internal.binding.ReadBinding;
import com.mongodb.internal.client.model.FindOptions;
import com.mongodb.internal.operation.BatchCursor;
import com.mongodb.internal.operation.MapReduceBatchCursor;
import com.mongodb.internal.operation.MapReduceStatistics;
import com.mongodb.internal.operation.ReadOperation;
import com.mongodb.internal.operation.SyncOperations;
import com.mongodb.internal.operation.WriteOperation;
import com.mongodb.lang.Nullable;
import org.bson.BsonDocument;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;

import java.util.concurrent.TimeUnit;

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

@SuppressWarnings("deprecation")
class MapReduceIterableImpl extends MongoIterableImpl
        implements com.mongodb.client.MapReduceIterable {
    private final SyncOperations operations;
    private final MongoNamespace namespace;
    private final Class resultClass;
    private final String mapFunction;
    private final String reduceFunction;

    private boolean inline = true;
    private String collectionName;
    private String finalizeFunction;
    private Bson scope;
    private Bson filter;
    private Bson sort;
    private int limit;
    private boolean jsMode;
    private boolean verbose = true;
    private long maxTimeMS;
    private com.mongodb.client.model.MapReduceAction action = com.mongodb.client.model.MapReduceAction.REPLACE;
    private String databaseName;
    private boolean sharded;
    private boolean nonAtomic;
    private Boolean bypassDocumentValidation;
    private Collation collation;

    MapReduceIterableImpl(@Nullable final ClientSession clientSession, final MongoNamespace namespace, final Class documentClass,
                          final Class resultClass, final CodecRegistry codecRegistry, final ReadPreference readPreference,
                          final ReadConcern readConcern, final WriteConcern writeConcern, final OperationExecutor executor,
                          final String mapFunction, final String reduceFunction) {
        super(clientSession, executor, readConcern, readPreference, false);
        this.operations = new SyncOperations<>(namespace, documentClass, readPreference, codecRegistry, readConcern, writeConcern,
                false, false);
        this.namespace = notNull("namespace", namespace);
        this.resultClass = notNull("resultClass", resultClass);
        this.mapFunction = notNull("mapFunction", mapFunction);
        this.reduceFunction = notNull("reduceFunction", reduceFunction);
    }

    @Override
    public void toCollection() {
        if (inline) {
            throw new IllegalStateException("The options must specify a non-inline result");
        }

        getExecutor().execute(createMapReduceToCollectionOperation(), getReadConcern(), getClientSession());
    }

    @Override
    public com.mongodb.client.MapReduceIterable collectionName(final String collectionName) {
        this.collectionName = notNull("collectionName", collectionName);
        this.inline = false;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable finalizeFunction(@Nullable final String finalizeFunction) {
        this.finalizeFunction = finalizeFunction;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable scope(@Nullable final Bson scope) {
        this.scope = scope;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable sort(@Nullable final Bson sort) {
        this.sort = sort;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable filter(@Nullable final Bson filter) {
        this.filter = filter;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable limit(final int limit) {
        this.limit = limit;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable jsMode(final boolean jsMode) {
        this.jsMode = jsMode;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable verbose(final boolean verbose) {
        this.verbose = verbose;
        return this;
    }

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

    @Override
    public com.mongodb.client.MapReduceIterable action(final com.mongodb.client.model.MapReduceAction action) {
        this.action = action;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable databaseName(@Nullable final String databaseName) {
        this.databaseName = databaseName;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable sharded(final boolean sharded) {
        this.sharded = sharded;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable nonAtomic(final boolean nonAtomic) {
        this.nonAtomic = nonAtomic;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable batchSize(final int batchSize) {
        super.batchSize(batchSize);
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable bypassDocumentValidation(@Nullable final Boolean bypassDocumentValidation) {
        this.bypassDocumentValidation = bypassDocumentValidation;
        return this;
    }

    @Override
    public com.mongodb.client.MapReduceIterable collation(@Nullable final Collation collation) {
        this.collation = collation;
        return this;
    }

    @Override
    ReadPreference getReadPreference() {
        if (inline) {
            return super.getReadPreference();
        } else {
            return primary();
        }
    }

    @Override
    public ReadOperation> asReadOperation() {
        if (inline) {
            ReadOperation> operation = operations.mapReduce(mapFunction, reduceFunction, finalizeFunction,
                    resultClass, filter, limit, maxTimeMS, jsMode, scope, sort, verbose, collation);
            return new WrappedMapReduceReadOperation<>(operation);
        } else {
            getExecutor().execute(createMapReduceToCollectionOperation(), getReadConcern(), getClientSession());

            String dbName = databaseName != null ? databaseName : namespace.getDatabaseName();

            FindOptions findOptions = new FindOptions().collation(collation);
            Integer batchSize = getBatchSize();
            if (batchSize != null) {
                findOptions.batchSize(batchSize);
            }
            return operations.find(new MongoNamespace(dbName, collectionName), new BsonDocument(), resultClass, findOptions);
        }

    }

    private WriteOperation createMapReduceToCollectionOperation() {
        return operations.mapReduceToCollection(databaseName, collectionName, mapFunction, reduceFunction, finalizeFunction, filter,
                limit, maxTimeMS, jsMode, scope, sort, verbose, action, nonAtomic, sharded, bypassDocumentValidation, collation
        );
    }

    // this could be inlined, but giving it a name so that it's unit-testable
    static class WrappedMapReduceReadOperation implements ReadOperation> {
        private final ReadOperation> operation;

        ReadOperation> getOperation() {
            return operation;
        }

        WrappedMapReduceReadOperation(final ReadOperation> operation) {
            this.operation = operation;
        }

        @Override
        public BatchCursor execute(final ReadBinding binding) {
            return operation.execute(binding);
        }
    }
}