<?php
/**
 * MainWP Utility Helper.
 *
 * @package MainWP/Dashboard
 */

namespace MainWP\Dashboard;

// phpcs:disable WordPress.DB.RestrictedFunctions, WordPress.WP.AlternativeFunctions, WordPress.PHP.NoSilencedErrors -- Using cURL functions.

/**
 * Class MainWP_Utility
 *
 * @package MainWP\Dashboard
 */
class MainWP_Utility {

	/**
	 * Yoast SEO is enabled return true else return null.
	 *
	 * @static
	 * @var boolean $enabled_wp_seo If Yoast SEO is enabled return true else return null.
	 */
	public static $enabled_wp_seo = null;

	/**
	 * Method get_class_name()
	 *
	 * Get Class Name.
	 *
	 * @return object __CLASS__
	 */
	public static function get_class_name() {
		return __CLASS__;
	}

	/**
	 * Method starts_with()
	 *
	 * Start of Stack Trace.
	 *
	 * @param mixed $haystack The full stack.
	 * @param mixed $needle The function that is throwing the error.
	 *
	 * @return mixed Needle in the Haystack.
	 */
	public static function starts_with( $haystack, $needle ) {
		return ! strncmp( $haystack, $needle, strlen( $needle ) );
	}

	/**
	 * Method ends_with()
	 *
	 * End of Stack Trace.
	 *
	 * @param mixed $haystack Haystack parameter.
	 * @param mixed $needle Needle parameter.
	 *
	 * @return boolean
	 */
	public static function ends_with( $haystack, $needle ) {
		$length = strlen( $needle );
		if ( 0 === $length ) {
			return true;
		}

		return ( substr( $haystack, - $length ) === $needle );
	}

	/**
	 * Method get_nice_url()
	 *
	 * Grab url.
	 *
	 * @param string $pUrl Website URL.
	 * @param bool   $showHttp Show HTTP.
	 *
	 * @return string $url.
	 */
	public static function get_nice_url( $pUrl, $showHttp = false ) {
		$url = $pUrl;

		if ( self::starts_with( $url, 'http://' ) ) {
			if ( ! $showHttp ) {
				$url = substr( $url, 7 );
			}
		} elseif ( self::starts_with( $pUrl, 'https://' ) ) {
			if ( ! $showHttp ) {
				$url = substr( $url, 8 );
			}
		} else {
			if ( $showHttp ) {
				$url = 'http://' . $url;
			}
		}

		if ( self::ends_with( $url, '/' ) ) {
			if ( ! $showHttp ) {
				$url = substr( $url, 0, strlen( $url ) - 1 );
			}
		} else {
			$url = $url . '/';
		}

		return $url;
	}

	/**
	 * Method is_domain_valid()
	 *
	 * Check $url against FILTER_VALIDATE_URL.
	 *
	 * @param mixed $url Domain to check.
	 *
	 * @return boolean True|False.
	 */
	public static function is_domain_valid( $url ) {
		return filter_var( $url, FILTER_VALIDATE_URL );
	}

	/**
	 * Method ctype_digit()
	 *
	 * Returns TRUE if every character in the string text is a decimal digit, FALSE otherwise.
	 *
	 * @param mixed $str String to check.
	 *
	 * @return boolean Returns TRUE if every character in the string text is a decimal digit, FALSE otherwise.
	 */
	public static function ctype_digit( $str ) {
		return ( is_string( $str ) || is_int( $str ) || is_float( $str ) ) && preg_match( '/^\d+\z/', $str );
	}

	/**
	 * Method sortmulti()
	 *
	 * Sort the given array, Acending, Decending or by Natural Order.
	 *
	 * @param mixed $array Array to sort.
	 * @param mixed $index Index of array.
	 * @param mixed $order Acending or Decending order.
	 * @param bool  $natsort Sort an array using a "natural order" algorithm. Default: false.
	 * @param bool  $case_sensitive If case sensitive return true else return false. Default: false.
	 *
	 * @return array $sorted Return the sorted array.
	 */
	public static function sortmulti( $array, $index, $order, $natsort = false, $case_sensitive = false ) {
		$sorted = array();
		if ( is_array( $array ) && 0 < count( $array ) ) {
			foreach ( array_keys( $array ) as $key ) {
				$temp[ $key ] = $array[ $key ][ $index ];
			}
			if ( ! $natsort ) {
				if ( 'asc' === $order ) {
					asort( $temp );
				} else {
					arsort( $temp );
				}
			} else {
				if ( true === $case_sensitive ) {
					natsort( $temp );
				} else {
					natcasesort( $temp );
				}
				if ( 'asc' !== $order ) {
					$temp = array_reverse( $temp, true );
				}
			}
			foreach ( array_keys( $temp ) as $key ) {
				if ( is_numeric( $key ) ) {
					$sorted[] = $array[ $key ];
				} else {
					$sorted[ $key ] = $array[ $key ];
				}
			}

			return $sorted;
		}

		return $sorted;
	}

	/**
	 * Method get_sub_array_having()
	 *
	 * Get sub array.
	 *
	 * @param mixed $array Array to traverse.
	 * @param mixed $index Index of array.
	 * @param mixed $value Array values.
	 *
	 * void array $output Sub array.
	 */
	public static function get_sub_array_having( $array, $index, $value ) {
		$output = array();
		if ( is_array( $array ) && 0 < count( $array ) ) {
			foreach ( $array as $arrvalue ) {
				if ( $arrvalue[ $index ] == $value ) {
					$output[] = $arrvalue;
				}
			}
		}

		return $output;
	}

	/**
	 * Method trim_slashes()
	 *
	 * Trim stashes from element.
	 *
	 * @param mixed $elem Element to trim.
	 *
	 * @return string Return string with no slashes.
	 */
	public static function trim_slashes( $elem ) {
		return trim( $elem, '/' );
	}

	/**
	 * Method sanitize()
	 *
	 * Sanitize given string.
	 *
	 * @param mixed $str String to sanitize.
	 *
	 * @return string Sanitized string.
	 */
	public static function sanitize( $str ) {
		return preg_replace( '/[\\\\\/\:"\*\?\<\>\|]+/', '', $str );
	}

	/**
	 * Method end_session()
	 *
	 * End a session.
	 *
	 * @return void
	 */
	public static function end_session() {

		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			return;
		}

		if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
			return;
		}

		session_write_close();
		if ( 0 < ob_get_length() ) {
			ob_end_flush();
		}
	}

	/**
	 * Method get_timestamp()
	 *
	 * Get time stamp in gmt_offset.
	 *
	 * @param mixed $timestamp Time stamp to convert.
	 *
	 * @return string Time stamp in general mountain time offset.
	 */
	public static function get_timestamp( $timestamp = false ) {
		if ( false === $timestamp ) {
			$timestamp = time();
		}
		$gmtOffset = get_option( 'gmt_offset' );

		return ( $gmtOffset ? ( $gmtOffset * HOUR_IN_SECONDS ) + $timestamp : $timestamp );
	}

	/**
	 * Method date()
	 *
	 * Show date in given format.
	 *
	 * @param mixed $format Format to display date in.
	 *
	 * @return string Date.
	 */
	public static function date( $format ) {
		// phpcs:ignore -- use local date function.
		return date( $format, self::get_timestamp() );
	}

	/**
	 * Method format_timestamp()
	 *
	 * Format the given timestamp.
	 *
	 * @param mixed $timestamp Timestamp to format.
	 *
	 * @return string Formatted timestamp.
	 */
	public static function format_timestamp( $timestamp ) {
		return date_i18n( get_option( 'date_format' ) . ' ' . get_option( 'time_format' ), $timestamp );
	}

	/**
	 * Method human_filesize()
	 *
	 * Convert to human readable file size format,
	 * (B|kB|MB|GB|TB|PB|EB|ZB|YB).
	 *
	 * @param mixed   $bytes File in bytes.
	 * @param integer $decimals Number of decimals to output.
	 *
	 * @return string Human readable file size.
	 */
	public static function human_filesize( $bytes, $decimals = 2 ) {
		$size   = array( 'B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB' );
		$factor = floor( ( strlen( $bytes ) - 1 ) / 3 );

		return sprintf( "%.{$decimals}f", $bytes / pow( 1024, $factor ) ) . @$size[ $factor ];
	}

	/**
	 * Method map_site()
	 *
	 * Map Site.
	 *
	 * @param mixed $website Website to map.
	 * @param mixed $keys Keys to map.
	 * @param bool  $object_output Output format array|object.
	 *
	 * @return object $outputSite Mapped site.
	 */
	public static function map_site( &$website, $keys, $object_output = true ) {
		$outputSite = array();
		if ( ! empty( $website ) ) {
			if ( is_object( $website ) ) {
				foreach ( $keys as $key ) {
					$outputSite[ $key ] = $website->$key;
				}
			} elseif ( is_array( $website ) ) {
				foreach ( $keys as $key ) {
					$outputSite[ $key ] = $website[ $key ];
				}
			}
		}

		if ( $object_output ) {
			return (object) $outputSite;
		} else {
			return $outputSite;
		}
	}

	/**
	 * Method array_merge()
	 *
	 * Merge two given arrays into one.
	 *
	 * @param mixed $arr1 First array.
	 * @param mixed $arr2 Second array.
	 *
	 * @return array Merged Array.
	 */
	public static function array_merge( $arr1, $arr2 ) {
		if ( ! is_array( $arr1 ) && ! is_array( $arr2 ) ) {
			return array();
		}
		if ( ! is_array( $arr1 ) ) {
			return $arr2;
		}
		if ( ! is_array( $arr2 ) ) {
			return $arr1;
		}

		$output = array();
		foreach ( $arr1 as $el ) {
			$output[] = $el;
		}
		foreach ( $arr2 as $el ) {
			$output[] = $el;
		}

		return $output;
	}

	/**
	 * Method update_option()
	 *
	 * Update option.
	 *
	 * @param mixed $option_name Option name.
	 * @param mixed $option_value Option value.
	 *
	 * @return (boolean) False if value was not updated and true if value was updated.
	 */
	public static function update_option( $option_name, $option_value ) {
		$success = add_option( $option_name, $option_value, '', 'no' );

		if ( ! $success ) {
			$success = update_option( $option_name, $option_value );
		}

		return $success;
	}

	/**
	 * Method update_user_option()
	 *
	 * Update option.
	 *
	 * @param mixed $option_name Option name.
	 * @param mixed $option_value Option value.
	 *
	 * @return (boolean) False if value was not updated and true if value was updated.
	 */
	public static function update_user_option( $option_name, $option_value ) {
		$user = wp_get_current_user();
		if ( $user ) {
			return update_user_option( $user->ID, $option_name, $option_value );
		}
		return false;
	}

	/**
	 * Method remove_preslash_spaces()
	 *
	 * Remove spaces before slashes.
	 *
	 * @param string $text String to strip.
	 *
	 * @return string $text Cleaned string.
	 */
	public static function remove_preslash_spaces( $text ) {
		while ( stristr( $text, ' /' ) ) {
			$text = str_replace( ' /', '/', $text );
		}

		return $text;
	}

	/**
	 * Method remove_http_prefix()
	 *
	 * Remove http prefixes from given url.
	 *
	 * @param mixed $pUrl Given URL.
	 * @param bool  $pTrimSlashes Whether or not to trim slashes. Default is false.
	 *
	 * @return string Trimmed URL.
	 */
	public static function remove_http_prefix( $pUrl, $pTrimSlashes = false ) {
		return str_replace( array( 'http:' . ( $pTrimSlashes ? '//' : '' ), 'https:' . ( $pTrimSlashes ? '//' : '' ) ), array( '', '' ), $pUrl );
	}

	/**
	 * Method remove_http_www_prefix()
	 *
	 * Remove 'www.' from given URL.
	 *
	 * @param mixed $pUrl Given URL.
	 *
	 * @return string Cleaned URL.
	 */
	public static function remove_http_www_prefix( $pUrl ) {
		$pUrl = self::remove_http_prefix( $pUrl, true );
		return str_replace( 'www.', '', $pUrl );
	}

	/**
	 * Method sanitize_file_name()
	 *
	 * Sanitize file names.
	 *
	 * @param mixed $filename File name to sanitize.
	 *
	 * @return string Sanitized filename.
	 */
	public static function sanitize_file_name( $filename ) {
		$filename = str_replace( array( '|', '/', '\\', ' ', ':' ), array( '-', '-', '-', '-', '-' ), $filename );

		return sanitize_file_name( $filename );
	}

	/**
	 * Method normalize_filename()
	 *
	 * Normalize filename.
	 *
	 * @param mixed $s Filename to normalize.
	 *
	 * @return string $s Normalised filename.
	 */
	public static function normalize_filename( $s ) {
		$s = preg_replace( '@\x{00c4}@u', 'A', $s );
		$s = preg_replace( '@\x{00d6}@u', 'O', $s );
		$s = preg_replace( '@\x{00dc}@u', 'U', $s );
		$s = preg_replace( '@\x{00cb}@u', 'E', $s );
		$s = preg_replace( '@\x{00e4}@u', 'a', $s );
		$s = preg_replace( '@\x{00f6}@u', 'o', $s );
		$s = preg_replace( '@\x{00fc}@u', 'u', $s );
		$s = preg_replace( '@\x{00eb}@u', 'e', $s );
		$s = preg_replace( '@\x{00f1}@u', 'n', $s );
		$s = preg_replace( '@\x{00ff}@u', 'y', $s );
		return $s;
	}


	/**
	 * Method esc_content()
	 *
	 * Escape content,
	 * allowed content (a,href,title,br,em,strong,p,hr,ul,ol,li,h1,h2 ... ).
	 *
	 * @param mixed  $content Content to escape.
	 * @param string $type Type of content. Default = note.
	 * @param mixed  $more_allowed input allowed tags - options.
	 *
	 * @return string Filtered content containing only the allowed HTML.
	 */
	public static function esc_content( $content, $type = 'note', $more_allowed = array() ) {
		if ( ! is_string( $content ) ) {
			return $content;
		}

		if ( 'note' === $type ) {

			$allowed_html = array(
				'a'      => array(
					'href'  => array(),
					'title' => array(),
				),
				'br'     => array(),
				'em'     => array(),
				'strong' => array(),
				'p'      => array(),
				'hr'     => array(),
				'ul'     => array(),
				'ol'     => array(),
				'li'     => array(),
				'h1'     => array(),
				'h2'     => array(),
			);

			if ( is_array( $more_allowed ) && ! empty( $more_allowed ) ) {
				$allowed_html = array_merge( $allowed_html, $more_allowed );
			}

			$content = wp_kses( $content, $allowed_html );

		} elseif ( 'mixed' == $type ) {

			$allowed_html = array(
				'a'      => array(
					'href'    => array(),
					'title'   => array(),
					'class'   => array(),
					'onclick' => array(),
				),
				'br'     => array(),
				'em'     => array(),
				'strong' => array(),
				'p'      => array(),
				'hr'     => array(),
				'ul'     => array(
					'style' => array(),
				),
				'ol'     => array(),
				'li'     => array(),
				'h1'     => array(),
				'h2'     => array(),
				'head'   => array(),
				'html'   => array(
					'lang' => array(),
				),
				'meta'   => array(
					'name'       => array(),
					'http-equiv' => array(),
					'content'    => array(),
					'charset'    => array(),
				),
				'title'  => array(),
				'body'   => array(
					'style' => array(),
				),
				'span'   => array(
					'id'    => array(),
					'style' => array(),
					'class' => array(),
				),
				'form'   => array(
					'id'       => array(),
					'method'   => array(),
					'action'   => array(),
					'onsubmit' => array(),
				),
				'table'  => array(
					'class' => array(),
				),
				'thead'  => array(
					'class' => array(),
				),
				'tbody'  => array(
					'class' => array(),
				),
				'tr'     => array(
					'id' => array(),
				),
				'td'     => array(
					'class' => array(),
				),
				'div'    => array(
					'id'    => array(),
					'style' => array(),
					'class' => array(),
				),
				'input'  => array(
					'type'    => array(),
					'name'    => array(),
					'class'   => array(),
					'value'   => array(),
					'onclick' => array(),
				),
				'button' => array(
					'type'    => array(),
					'name'    => array(),
					'value'   => array(),
					'class'   => array(),
					'title'   => array(),
					'onclick' => array(),
				),
			);

			if ( is_array( $more_allowed ) && ! empty( $more_allowed ) ) {
				$allowed_html = array_merge( $allowed_html, $more_allowed );
			}

			$content = wp_kses( $content, $allowed_html );
		} else {
			$content = wp_kses_post( $content );
		}

		return $content;
	}

	/**
	 * Method esc_mixed_content()
	 *
	 * Escape mixed content,
	 * allowed content (a,href,title,br,em,strong,p,hr,ul,ol,li,h1,h2 ... ).
	 *
	 * @param mixed  $data data to escape.
	 * @param string $depth Maximum depth to walk through $data. Must be greater than 0.
	 * @param mixed  $more_allowed input allowed tags - options.
	 *
	 * @throws \Exception Excetpion message.
	 *
	 * @return string Filtered content containing only the allowed HTML.
	 */
	public static function esc_mixed_content( $data, $depth, $more_allowed = array() ) {
		if ( $depth < 0 ) {
			throw new \Exception( 'Reached depth limit' );
		}

		if ( is_array( $data ) ) {
			$output = array();
			foreach ( $data as $id => $el ) {
				// Don't forget to sanitize the ID!
				if ( is_string( $id ) ) {
					$clean_id = self::esc_content( $id, 'mixed', $more_allowed );
				} else {
					$clean_id = $id;
				}

				// Check the element type, so that we're only recursing if we really have to.
				if ( is_array( $el ) || is_object( $el ) ) {
					$output[ $clean_id ] = self::esc_mixed_content( $el, $depth - 1 );
				} elseif ( is_string( $el ) ) {
					$output[ $clean_id ] = self::esc_content( $el, 'mixed', $more_allowed );
				} else {
					$output[ $clean_id ] = $el;
				}
			}
		} elseif ( is_object( $data ) ) {
			$output = new stdClass();
			foreach ( $data as $id => $el ) {
				if ( is_string( $id ) ) {
					$clean_id = self::esc_content( $id, 'mixed', $more_allowed );
				} else {
					$clean_id = $id;
				}

				if ( is_array( $el ) || is_object( $el ) ) {
					$output->$clean_id = self::esc_mixed_content( $el, $depth - 1, $more_allowed );
				} elseif ( is_string( $el ) ) {
					$output->$clean_id = self::esc_content( $el, 'mixed', $more_allowed );
				} else {
					$output->$clean_id = $el;
				}
			}
		} elseif ( is_string( $data ) ) {
			return self::esc_content( $data, 'mixed', $more_allowed );
		} else {
			return $data;
		}

		return $output;
	}

	/**
	 * Method show_mainwp_message()
	 *
	 * Check whenther or not to show the MainWP Message.
	 *
	 * @param mixed $type Type of message.
	 * @param mixed $notice_id Notice ID.
	 *
	 * @return boolean true|false.
	 */
	public static function show_mainwp_message( $type, $notice_id ) {
		$status = get_user_option( 'mainwp_notice_saved_status' );
		if ( ! is_array( $status ) ) {
			$status = array();
		}
		if ( isset( $status[ $notice_id ] ) ) {
			return false;
		}
		return true;
	}

	/**
	 * Method array_sort()
	 *
	 * Sort given array by given flags.
	 *
	 * @param mixed  $array Array to sort.
	 * @param mixed  $key Array key.
	 * @param string $sort_flag Flags to sort by. Default = SORT_STRING.
	 */
	public static function array_sort( &$array, $key, $sort_flag = SORT_STRING ) {
		$sorter = array();
		$ret    = array();
		reset( $array );
		foreach ( $array as $ii => $val ) {
			$sorter[ $ii ] = $val[ $key ];
		}
		asort( $sorter, $sort_flag );
		foreach ( $sorter as $ii => $val ) {
			$ret[ $ii ] = $array[ $ii ];
		}
		$array = $ret;
	}

	/**
	 * Method enabled_wp_seo()
	 *
	 * Check if Yoast SEO is enabled.
	 *
	 * @return boolean true|false.
	 */
	public static function enabled_wp_seo() {
		if ( null === self::$enabled_wp_seo ) {
			self::$enabled_wp_seo = is_plugin_active( 'wordpress-seo-extension/wordpress-seo-extension.php' );
		}
		return self::$enabled_wp_seo;
	}

	/**
	 * Method value_to_string()
	 *
	 * Value to string.
	 *
	 * @param mixed $var Value to convert to string.
	 *
	 * @return string Value that has been converted into a string.
	 */
	public static function value_to_string( $var ) {
		if ( is_array( $var ) || is_object( $var ) ) {
			//phpcs:ignore -- for debug only
			return print_r( $var, true );  // @codingStandardsIgnoreLine
		} elseif ( is_string( $var ) ) {
			return $var;
		}
		return '';
	}

	/**
	 * Method render_mainwp_nonce()
	 *
	 * Render MainWP nonce.
	 */
	public static function render_mainwp_nonce() {
		wp_nonce_field( 'mainwp-admin-nonce' );
	}


	/**
	 * Get Health Site value.
	 *
	 * @param mixed $issue_counts Health site issues.
	 *
	 * @return array $array Health status value.
	 */
	public static function get_site_health( $issue_counts ) {

		if ( empty( $issue_counts ) ) {
			$issue_counts = array(
				'good'        => 0,
				'recommended' => 0,
				'critical'    => 0,
			);
		}

		$totalTests  = intval( $issue_counts['good'] ) + intval( $issue_counts['recommended'] ) + intval( $issue_counts['critical'] ) * 1.5;
		$failedTests = intval( $issue_counts['recommended'] ) * 0.5 + $issue_counts['critical'] * 1.5;

		if ( 0 == $totalTests ) {
				$val = 100;
		} else {
				$val = 100 - ceil( ( $failedTests / $totalTests ) * 100 );
		}

		if ( 0 > $val ) {
			$val = 0;
		}

		if ( 100 < $val ) {
			$val = 100;
		}

		return array(
			'val'      => $val,
			'critical' => $issue_counts['critical'],
		);
	}


	/**
	 * Get HTTP code.
	 *
	 * @param int $code HTTP code.
	 *
	 * @return array $http_codes HTTP code.
	 */
	public static function get_http_codes( $code = false ) {

		$http_codes = array(
			100 => 'Continue',
			101 => 'Switching Protocols',
			200 => 'OK',
			201 => 'Created',
			202 => 'Accepted',
			203 => 'Non-Authoritative Information',
			204 => 'No Content',
			205 => 'Reset Content',
			206 => 'Partial Content',
			300 => 'Multiple Choices',
			301 => 'Moved Permanently',
			302 => 'Found',
			303 => 'See Other',
			304 => 'Not Modified',
			305 => 'Use Proxy',
			306 => '(Unused)',
			307 => 'Temporary Redirect',
			400 => 'Bad Request',
			401 => 'Unauthorized',
			402 => 'Payment Required',
			403 => 'Forbidden',
			404 => 'Not Found',
			405 => 'Method Not Allowed',
			406 => 'Not Acceptable',
			407 => 'Proxy Authentication Required',
			408 => 'Request Timeout',
			409 => 'Conflict',
			410 => 'Gone',
			411 => 'Length Required',
			412 => 'Precondition Failed',
			413 => 'Request Entity Too Large',
			414 => 'Request-URI Too Long',
			415 => 'Unsupported Media Type',
			416 => 'Requested Range Not Satisfiable',
			417 => 'Expectation Failed',
			500 => 'Internal Server Error',
			501 => 'Not Implemented',
			502 => 'Bad Gateway',
			503 => 'Service Unavailable',
			504 => 'Gateway Timeout',
			505 => 'HTTP Version Not Supported',
		);

		if ( false === $code ) {
			return $http_codes;
		}

		return isset( $http_codes[ $code ] ) ? $http_codes[ $code ] : '';
	}

	/**
	 * Method valid_input_emails().
	 *
	 * @param string $emails Input emails string.
	 *
	 * @return string $valid_emails Valid emails string.
	 */
	public static function valid_input_emails( $emails ) {

		if ( is_string( $emails ) ) {
			$emails = array_filter( explode( ',', $emails ) );
		}

		$valid_emails = array();
		if ( is_array( $emails ) ) {
			foreach ( $emails as $email ) {
				$email = esc_html( trim( $email ) );
				if ( ! empty( $email ) && ! in_array( $email, $valid_emails, true ) ) {
					$valid_emails[] = $email;
				}
			}
		}
		$valid_emails = implode( ',', $valid_emails );
		return $valid_emails;
	}

	/**
	 * Method check_image_file_name()
	 *
	 * Check if the file image.
	 *
	 * @param string $filename Contains image (file) name.
	 *
	 * @return true|false valid name or not.
	 */
	public static function check_image_file_name( $filename ) {
		if ( validate_file( $filename ) ) {
			return false;
		}

		$allowed_files = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png', 'bmp', 'tif', 'tiff', 'ico' );
		$file_ext      = array_values( array_slice( explode( '.', $filename ), -1 ) )[0];
		$file_ext      = strtolower( $file_ext );
		if ( ! in_array( $file_ext, $allowed_files ) ) {
			return false;
		}

		return true;
	}

	/**
	 * Method check_abandoned()
	 *
	 * Get site's icon.
	 *
	 * @param mixed  $siteId site's id.
	 * @param string $which to check plugin/theme.
	 *
	 * @return array result error or success
	 * @throws \Exception Error message.
	 */
	public static function check_abandoned( $siteId = null, $which = '' ) {
		if ( self::ctype_digit( $siteId ) ) {
			$website = MainWP_DB::instance()->get_website_by_id( $siteId );
			if ( MainWP_System_Utility::can_edit_website( $website ) ) {
				$error = '';
				try {
					$information = MainWP_Connect::fetch_url_authed( $website, 'check_abandoned', array( 'which' => $which ) );
					if ( is_array( $information ) && isset( $information['sync'] ) && ! empty( $information['sync'] ) ) {
						MainWP_Sync::sync_information_array( $website, $information['sync'] );
						unset( $information['sync'] );
					}
				} catch ( MainWP_Exception $e ) {
					$error = $e->getMessage();
				}

				if ( '' != $error ) {
					return array( 'error' => $error );
				} elseif ( isset( $information['success'] ) && ! empty( $information['success'] ) ) {
					return array( 'result' => 'success' );
				} else {
					return array( 'undefined_error' => true );
				}
			}
		}
		return array( 'result' => 'NOSITE' );
	}
}
