/*
 * 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.internal.operation;

import com.mongodb.MongoNamespace;
import com.mongodb.WriteConcern;
import com.mongodb.client.model.Collation;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.connection.ServerDescription;
import com.mongodb.internal.validator.NoOpFieldNameValidator;
import com.mongodb.internal.session.SessionContext;
import com.mongodb.lang.Nullable;
import org.bson.BsonBoolean;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.FieldNameValidator;
import org.bson.codecs.Decoder;
import org.bson.conversions.Bson;

import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.operation.CommandOperationHelper.CommandCreator;
import static com.mongodb.internal.operation.DocumentHelper.putIfNotNull;
import static com.mongodb.internal.operation.DocumentHelper.putIfNotZero;
import static com.mongodb.internal.operation.OperationHelper.validateCollation;
import static com.mongodb.internal.operation.OperationHelper.validateHint;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

An operation that atomically finds and deletes a single document.
Type parameters:
<T> – the operations result type.
@mongodb.driver.manual
reference/command/findAndModify/ findAndModify
Since:
3.0/**
 * An operation that atomically finds and deletes a single document.
 *
 * @param <T> the operations result type.
 * @mongodb.driver.manual reference/command/findAndModify/ findAndModify
 * @since 3.0
 */
public class FindAndDeleteOperation<T> extends BaseFindAndModifyOperation<T> {
    private BsonDocument filter;
    private BsonDocument projection;
    private BsonDocument sort;
    private long maxTimeMS;
    private Collation collation;
    private Bson hint;
    private String hintString;

    
Construct a new instance.
Params:
namespace – the database and collection namespace for the operation.
decoder –   the decoder for the result documents./**
     * 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<T> decoder) {
        this(namespace, WriteConcern.ACKNOWLEDGED, false, decoder);
    }

    
Construct a new instance.
Params:
namespace –    the database and collection namespace for the operation.
writeConcern – the writeConcern for the operation
decoder –      the decoder for the result documents.
Since:
3.2/**
     * Construct a new instance.
     *
     * @param namespace    the database and collection namespace for the operation.
     * @param writeConcern the writeConcern for the operation
     * @param decoder      the decoder for the result documents.
     * @since 3.2
     */
    public FindAndDeleteOperation(final MongoNamespace namespace, final WriteConcern writeConcern, final Decoder<T> decoder) {
        this(namespace, writeConcern, false, decoder);
    }

    
Construct a new instance.
Params:
namespace –    the database and collection namespace for the operation.
writeConcern – the writeConcern for the operation
retryWrites –  if writes should be retried if they fail due to a network error.
decoder –      the decoder for the result documents.
Since:
3.6/**
     * Construct a new instance.
     *
     * @param namespace    the database and collection namespace for the operation.
     * @param writeConcern the writeConcern for the operation
     * @param retryWrites  if writes should be retried if they fail due to a network error.
     * @param decoder      the decoder for the result documents.
     * @since 3.6
     */
    public FindAndDeleteOperation(final MongoNamespace namespace, final WriteConcern writeConcern, final boolean retryWrites,
                                  final Decoder<T> decoder) {
        super(namespace, writeConcern, retryWrites, decoder);
    }

    
Gets the query filter.
Returns:
the query filter
@mongodb.driver.manual
reference/method/db.collection.find/ Filter/**
     * 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.
Params:
filter – the filter, which may be null.
Returns:
this
@mongodb.driver.manual
reference/method/db.collection.find/ 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<T> filter(final BsonDocument filter) {
        this.filter = filter;
        return this;
    }

    
Gets a document describing the fields to return for all matching documents.
Returns:
the project document, which may be null
@mongodb.driver.manual
reference/method/db.collection.find/ Projection/**
     * 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.
Params:
projection – the project document, which may be null.
Returns:
this
@mongodb.driver.manual
reference/method/db.collection.find/ 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<T> 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.
Params:
timeUnit – the time unit to return the result in
Returns:
the maximum execution time in the given time unit/**
     * 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.
Params:
maxTime –  the max time
timeUnit – the time unit, which may not be null
Returns:
this/**
     * 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<T> 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.
Returns:
a document describing the sort criteria
@mongodb.driver.manual
reference/method/cursor.sort/ Sort/**
     * 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.
Params:
sort – the sort criteria, which may be null.
Returns:
this
@mongodb.driver.manual
reference/method/cursor.sort/ 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<T> sort(final BsonDocument sort) {
        this.sort = sort;
        return this;
    }

    
Returns the collation options
Returns:
the collation options/**
     * Returns the collation options
     *
     * @return the collation options
     */
    public Collation getCollation() {
        return collation;
    }

    
Sets the collation options
A null value represents the server default.
Params:
collation – the collation options to use
Returns:
this/**
     * Sets the collation options
     *
     * <p>A null value represents the server default.</p>
     * @param collation the collation options to use
     * @return this
     */
    public FindAndDeleteOperation<T> collation(final Collation collation) {
        this.collation = collation;
        return this;
    }

    
Returns the hint for which index to use. The default is not to set a hint.
Returns:
the hint/**
     * Returns the hint for which index to use. The default is not to set a hint.
     *
     * @return the hint
     */
    @Nullable
    public Bson getHint() {
        return hint;
    }

    
Sets the hint for which index to use. A null value means no hint is set.
Params:
hint – the hint
Returns:
this/**
     * Sets the hint for which index to use. A null value means no hint is set.
     *
     * @param hint the hint
     * @return this
     */
    public FindAndDeleteOperation<T> hint(@Nullable final Bson hint) {
        this.hint = hint;
        return this;
    }

    
Gets the hint string to apply.
Returns:
the hint string, which should be the name of an existing index/**
     * Gets the hint string to apply.
     *
     * @return the hint string, which should be the name of an existing index
     */
    @Nullable
    public String getHintString() {
        return hintString;
    }

    
Sets the hint to apply.
Params:
hint – the name of the index which should be used for the operation
Returns:
this/**
     * Sets the hint to apply.
     *
     * @param hint the name of the index which should be used for the operation
     * @return this
     */
    public FindAndDeleteOperation<T> hintString(@Nullable final String hint) {
        this.hintString = hint;
        return this;
    }

    @Override
    protected String getDatabaseName() {
        return getNamespace().getDatabaseName();
    }

    @Override
    protected CommandCreator getCommandCreator(final SessionContext sessionContext) {
        return new CommandCreator() {
            @Override
            public BsonDocument create(final ServerDescription serverDescription, final ConnectionDescription connectionDescription) {
                return createCommand(sessionContext, serverDescription, connectionDescription);
            }
        };
    }

    private BsonDocument createCommand(final SessionContext sessionContext, final ServerDescription serverDescription,
                                       final ConnectionDescription connectionDescription) {
        validateCollation(connectionDescription, collation);
        BsonDocument commandDocument = new BsonDocument("findAndModify", new BsonString(getNamespace().getCollectionName()));
        putIfNotNull(commandDocument, "query", getFilter());
        putIfNotNull(commandDocument, "fields", getProjection());
        putIfNotNull(commandDocument, "sort", getSort());
        putIfNotZero(commandDocument, "maxTimeMS", getMaxTime(MILLISECONDS));
        commandDocument.put("remove", BsonBoolean.TRUE);
        addWriteConcernToCommand(connectionDescription, commandDocument, sessionContext);
        if (collation != null) {
            commandDocument.put("collation", collation.asDocument());
        }
        if (hint != null || hintString != null) {
            validateHint(connectionDescription, getWriteConcern());
            if (hint != null) {
                commandDocument.put("hint", hint.toBsonDocument(BsonDocument.class, null));
            } else {
                commandDocument.put("hint", new BsonString(hintString));
            }
        }
        addTxnNumberToCommand(serverDescription, connectionDescription, commandDocument, sessionContext);
        return commandDocument;
    }

    @Override
    protected FieldNameValidator getFieldNameValidator() {
        return new NoOpFieldNameValidator();
    }

}