<?php
 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_float;
 use function is_integer;
 use function is_object;
 use function is_string;
 use function MongoDB\server_supports_feature;
 class Count implements Executable, Explainable {
 private static $wireVersionForCollation = 5;
 private static $wireVersionForReadConcern = 4;
 private $databaseName;
 private $collectionName;
 private $filter;
 private $options;
 public function __construct($databaseName, $collectionName, $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['hint']) && ! is_string($options['hint']) && ! is_array($options['hint']) && ! is_object($options['hint'])) {
 throw InvalidArgumentException::invalidType('"hint" option', $options['hint'], 'string or array or object');
 }
 if (isset($options['limit']) && ! is_integer($options['limit'])) {
 throw InvalidArgumentException::invalidType('"limit" option', $options['limit'], 'integer');
 }
 if (isset($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['skip']) && ! is_integer($options['skip'])) {
 throw InvalidArgumentException::invalidType('"skip" option', $options['skip'], 'integer');
 }
 if (isset($options['readConcern']) && $options['readConcern']->isDefault()) {
 unset($options['readConcern']);
 }
 $this->databaseName = (string) $databaseName;
 $this->collectionName = (string) $collectionName;
 $this->filter = $filter;
 $this->options = $options;
 }
 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());
 $result = current($cursor->toArray());
 if (! isset($result->n) || ! (is_integer($result->n) || is_float($result->n))) {
 throw new UnexpectedValueException('count command did not return a numeric "n" value');
 }
 return (integer) $result->n;
 }
 public function getCommandDocument(Server $server) {
 return $this->createCommandDocument();
 }
 private function createCommandDocument() {
 $cmd = ['count' => $this->collectionName];
 if (! empty($this->filter)) {
 $cmd['query'] = (object) $this->filter;
 }
 if (isset($this->options['collation'])) {
 $cmd['collation'] = (object) $this->options['collation'];
 }
 if (isset($this->options['hint'])) {
 $cmd['hint'] = is_array($this->options['hint']) ? (object) $this->options['hint'] : $this->options['hint'];
 }
 foreach (['limit', 'maxTimeMS', 'skip'] as $option) {
 if (isset($this->options[$option])) {
 $cmd[$option] = $this->options[$option];
 }
 }
 return $cmd;
 }
 private function createOptions() {
 $options = [];
 if (isset($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;
 }
 }
 