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/*
 * Copyright (c) 2008-2014 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.operation;

import com.mongodb.MongoNamespace;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.binding.AsyncWriteBinding;
import com.mongodb.binding.WriteBinding;
import org.bson.BsonBoolean;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.codecs.Decoder;

import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol;
import static com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocolAsync;
import static com.mongodb.operation.DocumentHelper.putIfNotNull;
import static com.mongodb.operation.DocumentHelper.putIfNotZero;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

/**
 * An operation that atomically finds and deletes a single document.
 *
 * @param  the operations result type.
 * @since 3.0
 */
public class FindAndDeleteOperation implements AsyncWriteOperation, WriteOperation {
    private final MongoNamespace namespace;
    private final Decoder decoder;
    private BsonDocument filter;
    private BsonDocument projection;
    private BsonDocument sort;
    private long maxTimeMS;

    /**
     * Construct a new instance.
     *
     * @param namespace the database and collection namespace for the operation.
     * @param decoder the decoder for the result documents.
     */
    public FindAndDeleteOperation(final MongoNamespace namespace, final Decoder decoder) {
        this.namespace = notNull("namespace", namespace);
        this.decoder = notNull("decoder", decoder);
    }

    /**
     * Gets the namespace.
     *
     * @return the namespace
     */
    public MongoNamespace getNamespace() {
        return namespace;
    }

    /**
     * Gets the decoder used to decode the result documents.
     *
     * @return the decoder
     */
    public Decoder getDecoder() {
        return decoder;
    }

    /**
     * Gets the query filter.
     *
     * @return the query filter
     * @mongodb.driver.manual reference/method/db.collection.find/ Filter
     */
    public BsonDocument getFilter() {
        return filter;
    }

    /**
     * Sets the filter to apply to the query.
     *
     * @param filter the filter, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/db.collection.find/ Filter
     */
    public FindAndDeleteOperation filter(final BsonDocument filter) {
        this.filter = filter;
        return this;
    }

    /**
     * Gets a document describing the fields to return for all matching documents.
     *
     * @return the project document, which may be null
     * @mongodb.driver.manual reference/method/db.collection.find/ Projection
     */
    public BsonDocument getProjection() {
        return projection;
    }

    /**
     * Sets a document describing the fields to return for all matching documents.
     *
     * @param projection the project document, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/db.collection.find/ Projection
     */
    public FindAndDeleteOperation projection(final BsonDocument projection) {
        this.projection = projection;
        return this;
    }


    /**
     * Gets the maximum execution time on the server for this operation.  The default is 0, which places no limit on the execution time.
     *
     * @param timeUnit the time unit to return the result in
     * @return the maximum execution time in the given time unit
     */
    public long getMaxTime(final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        return timeUnit.convert(maxTimeMS, MILLISECONDS);
    }

    /**
     * Sets the maximum execution time on the server for this operation.
     *
     * @param maxTime  the max time
     * @param timeUnit the time unit, which may not be null
     * @return this
     */
    public FindAndDeleteOperation maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxTimeMS = MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

    /**
     * Gets the sort criteria to apply to the query. The default is null, which means that the documents will be returned in an undefined
     * order.
     *
     * @return a document describing the sort criteria
     * @mongodb.driver.manual reference/method/cursor.sort/ Sort
     */
    public BsonDocument getSort() {
        return sort;
    }

    /**
     * Sets the sort criteria to apply to the query.
     *
     * @param sort the sort criteria, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/cursor.sort/ Sort
     */
    public FindAndDeleteOperation sort(final BsonDocument sort) {
        this.sort = sort;
        return this;
    }

    @Override
    public T execute(final WriteBinding binding) {
        return executeWrappedCommandProtocol(binding, namespace.getDatabaseName(), getFindAndRemoveDocument(),
                                             CommandResultDocumentCodec.create(decoder, "value"),
                                             FindAndModifyHelper.transformer());
    }

    @Override
    public void executeAsync(final AsyncWriteBinding binding, final SingleResultCallback callback) {
        executeWrappedCommandProtocolAsync(binding, namespace.getDatabaseName(), getFindAndRemoveDocument(),
                                           CommandResultDocumentCodec.create(decoder, "value"),
                                           FindAndModifyHelper.transformer(), callback);
    }

    private BsonDocument getFindAndRemoveDocument() {
        BsonDocument command = new BsonDocument("findandmodify", new BsonString(namespace.getCollectionName()));
        putIfNotNull(command, "query", getFilter());
        putIfNotNull(command, "fields", getProjection());
        putIfNotNull(command, "sort", getSort());
        putIfNotZero(command, "maxTimeMS", getMaxTime(MILLISECONDS));
        command.put("remove", BsonBoolean.TRUE);
        return command;
    }

}