<?php
/*

<  * Copyright 2015-2017 MongoDB, Inc.



>  * Copyright 2015-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



>  *   https://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.
 */

namespace MongoDB\Operation;

use MongoDB\Driver\Command;
use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
use MongoDB\Driver\ReadConcern;
use MongoDB\Driver\ReadPreference;
use MongoDB\Driver\Server;
use MongoDB\Driver\Session;
use MongoDB\Exception\InvalidArgumentException;
use MongoDB\Exception\UnexpectedValueException;
use MongoDB\Exception\UnsupportedException;

> 


use function current;
use function is_array;
use function is_integer;
use function is_object;
use function MongoDB\create_field_path_type_map;

< use function MongoDB\server_supports_feature;



/**
 * Operation for the distinct command.
 *
 * @api
 * @see \MongoDB\Collection::distinct()

<  * @see http://docs.mongodb.org/manual/reference/command/distinct/



>  * @see https://mongodb.com/docs/manual/reference/command/distinct/


 */
class Distinct implements Executable, Explainable
{

<     /** @var integer */
<     private static $wireVersionForCollation = 5;
< 
<     /** @var integer */
<     private static $wireVersionForReadConcern = 4;
< 


    /** @var string */
    private $databaseName;

    /** @var string */
    private $collectionName;

    /** @var string */
    private $fieldName;

    /** @var array|object */
    private $filter;

    /** @var array */
    private $options;

    /**
     * Constructs a distinct command.
     *
     * Supported options:
     *
     *  * collation (document): Collation specification.
     *

<      *    This is not supported for server versions < 3.4 and will result in an
<      *    exception at execution time if used.



>      *  * comment (mixed): BSON value to attach as a comment to this command.
>      *
>      *    This is not supported for servers versions < 4.4.


     *
     *  * maxTimeMS (integer): The maximum amount of time to allow the query to
     *    run.
     *
     *  * readConcern (MongoDB\Driver\ReadConcern): Read concern.
     *

<      *    This is not supported for server versions < 3.2 and will result in an
<      *    exception at execution time if used.
<      *


     *  * readPreference (MongoDB\Driver\ReadPreference): Read preference.
     *
     *  * session (MongoDB\Driver\Session): Client session.
     *

<      *    Sessions are not supported for server versions < 3.6.
<      *


     *  * typeMap (array): Type map for BSON deserialization.
     *
     * @param string       $databaseName   Database name
     * @param string       $collectionName Collection name
     * @param string       $fieldName      Field for which to return distinct values
     * @param array|object $filter         Query by which to filter documents
     * @param array        $options        Command options
     * @throws InvalidArgumentException for parameter/option parsing errors
     */

<     public function __construct($databaseName, $collectionName, $fieldName, $filter = [], array $options = [])



>     public function __construct(string $databaseName, string $collectionName, string $fieldName, $filter = [], array $options = [])


    {
        if (! is_array($filter) && ! is_object($filter)) {
            throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
        }

        if (isset($options['collation']) && ! is_array($options['collation']) && ! is_object($options['collation'])) {
            throw InvalidArgumentException::invalidType('"collation" option', $options['collation'], 'array or object');
        }

        if (isset($options['maxTimeMS']) && ! is_integer($options['maxTimeMS'])) {
            throw InvalidArgumentException::invalidType('"maxTimeMS" option', $options['maxTimeMS'], 'integer');
        }

        if (isset($options['readConcern']) && ! $options['readConcern'] instanceof ReadConcern) {
            throw InvalidArgumentException::invalidType('"readConcern" option', $options['readConcern'], ReadConcern::class);
        }

        if (isset($options['readPreference']) && ! $options['readPreference'] instanceof ReadPreference) {
            throw InvalidArgumentException::invalidType('"readPreference" option', $options['readPreference'], ReadPreference::class);
        }

        if (isset($options['session']) && ! $options['session'] instanceof Session) {
            throw InvalidArgumentException::invalidType('"session" option', $options['session'], Session::class);
        }

        if (isset($options['typeMap']) && ! is_array($options['typeMap'])) {
            throw InvalidArgumentException::invalidType('"typeMap" option', $options['typeMap'], 'array');
        }

        if (isset($options['readConcern']) && $options['readConcern']->isDefault()) {
            unset($options['readConcern']);
        }


<         $this->databaseName = (string) $databaseName;
<         $this->collectionName = (string) $collectionName;
<         $this->fieldName = (string) $fieldName;



>         $this->databaseName = $databaseName;
>         $this->collectionName = $collectionName;
>         $this->fieldName = $fieldName;


        $this->filter = $filter;
        $this->options = $options;
    }

    /**
     * Execute the operation.
     *
     * @see Executable::execute()

<      * @param Server $server
<      * @return mixed[]



>      * @return array


     * @throws UnexpectedValueException if the command response was malformed

<      * @throws UnsupportedException if collation or read concern is used and unsupported



>      * @throws UnsupportedException if read concern is used and unsupported


     * @throws DriverRuntimeException for other driver errors (e.g. connection errors)
     */
    public function execute(Server $server)
    {

<         if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
<             throw UnsupportedException::collationNotSupported();
<         }
< 
<         if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
<             throw UnsupportedException::readConcernNotSupported();
<         }
< 


        $inTransaction = isset($this->options['session']) && $this->options['session']->isInTransaction();
        if ($inTransaction && isset($this->options['readConcern'])) {
            throw UnsupportedException::readConcernNotSupportedInTransaction();
        }

        $cursor = $server->executeReadCommand($this->databaseName, new Command($this->createCommandDocument()), $this->createOptions());

        if (isset($this->options['typeMap'])) {
            $cursor->setTypeMap(create_field_path_type_map($this->options['typeMap'], 'values.$'));
        }

        $result = current($cursor->toArray());


<         if (! isset($result->values) || ! is_array($result->values)) {



>         if (! is_object($result) || ! isset($result->values) || ! is_array($result->values)) {


            throw new UnexpectedValueException('distinct command did not return a "values" array');
        }

        return $result->values;
    }


>     /**
    public function getCommandDocument(Server $server)
>      * Returns the command document for this operation.
    {
>      *
        return $this->createCommandDocument();
>      * @see Explainable::getCommandDocument()
    }
>      * @return array

>      */


    /**
     * Create the distinct command document.

<      *
<      * @return array


     */

<     private function createCommandDocument()



>     private function createCommandDocument(): array


    {
        $cmd = [
            'distinct' => $this->collectionName,
            'key' => $this->fieldName,
        ];

        if (! empty($this->filter)) {
            $cmd['query'] = (object) $this->filter;
        }

        if (isset($this->options['collation'])) {
            $cmd['collation'] = (object) $this->options['collation'];
        }


<         if (isset($this->options['maxTimeMS'])) {
<             $cmd['maxTimeMS'] = $this->options['maxTimeMS'];



>         foreach (['comment', 'maxTimeMS'] as $option) {
>             if (isset($this->options[$option])) {
>                 $cmd[$option] = $this->options[$option];
>             }


        }

        return $cmd;
    }

    /**
     * Create options for executing the command.
     *

<      * @see http://php.net/manual/en/mongodb-driver-server.executereadcommand.php
<      * @return array



>      * @see https://php.net/manual/en/mongodb-driver-server.executereadcommand.php


     */

<     private function createOptions()



>     private function createOptions(): array


    {
        $options = [];

        if (isset($this->options['readConcern'])) {
            $options['readConcern'] = $this->options['readConcern'];
        }

        if (isset($this->options['readPreference'])) {
            $options['readPreference'] = $this->options['readPreference'];
        }

        if (isset($this->options['session'])) {
            $options['session'] = $this->options['session'];
        }

        return $options;
    }
}