<?php
/**
 * Defines common functionality used throughout the plugin.
 *
 * @package WP_Stream
 */

/**
 * Gets a specific external variable by name and optionally filters it.
 *
 * This is a polyfill function intended to be used in place of PHP's
 * filter_input() function, which can occasionally be unreliable.
 *
 * @param int    $type           One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.
 * @param string $variable_name  Name of a variable to get.
 * @param int    $filter         The ID of the filter to apply.
 * @param mixed  $options        Associative array of options or bitwise disjunction of flags. If filter accepts options, flags can be provided in "flags" field of array.
 *
 * @return Value of the requested variable on success, FALSE if the filter fails, or NULL if the $variable_name is not set.
 */
function wp_stream_filter_input( $type, $variable_name, $filter = null, $options = array() ) {
	return call_user_func_array( array( '\WP_Stream\Filter_Input', 'super' ), func_get_args() );
}

/**
 * Filters a variable with a specified filter.
 *
 * This is a polyfill function intended to be used in place of PHP's
 * filter_var() function, which can occasionally be unreliable.
 *
 * @param string $var      Value to filter.
 * @param int    $filter   The ID of the filter to apply.
 * @param mixed  $options  Associative array of options or bitwise disjunction of flags. If filter accepts options, flags can be provided in "flags" field of array. For the "callback" filter, callable type should be passed. The callback must accept one argument, the value to be filtered, and return the value after filtering/sanitizing it.
 *
 * @return Returns the filtered data, or FALSE if the filter fails.
 */
function wp_stream_filter_var( $var, $filter = null, $options = array() ) {
	return call_user_func_array( array( '\WP_Stream\Filter_Input', 'filter' ), func_get_args() );
}

/**
 * Converts a time into an ISO 8601 extended formatted string.
 *
 * @param int|bool $time   Seconds since unix epoch.
 * @param int      $offset Timezone offset.
 *
 * @return string an ISO 8601 extended formatted time
 */
function wp_stream_get_iso_8601_extended_date( $time = false, $offset = 0 ) {
	if ( $time ) {
		$microtime = (float) $time . '.0000';
	} else {
		$microtime = microtime( true );
	}

	$micro_seconds = sprintf( '%06d', ( $microtime - floor( $microtime ) ) * 1000000 );
	$offset_string = sprintf( 'Etc/GMT%s%d', $offset < 0 ? '+' : '-', abs( $offset ) );

	$timezone = new DateTimeZone( $offset_string );
	$date     = new DateTime( gmdate( 'Y-m-d H:i:s.' . $micro_seconds, $microtime ), $timezone );

	return $date->format( 'Y-m-d\TH:i:sO' );
}

/**
 * Encode to JSON in a way that is also backwards compatible
 *
 * @param mixed $data     Data to be encoded.
 * @param int   $options  Compression options (optional).
 * @param int   $depth    Tree depth limit (optional).
 *
 * @return string
 */
function wp_stream_json_encode( $data, $options = 0, $depth = 512 ) {
	if ( function_exists( 'wp_json_encode' ) ) {
		$json = wp_json_encode( $data, $options, $depth );
	} else {
		// @codingStandardsIgnoreStart
		if ( version_compare( PHP_VERSION, '5.5', '<' ) ) {
			$json = json_encode( $data, $options );
		} else {
			$json = json_encode( $data, $options, $depth );
		}
		// @codingStandardsIgnoreEnd
	}

	return $json;
}

/**
 * Return an array of sites for a network in a way that is also backwards compatible
 *
 * @param string|array $args  Argument to filter results by.
 *
 * @return array
 */
function wp_stream_get_sites( $args = array() ) {
	if ( empty( $args['limit'] ) ) {
		$args['limit'] = 0;
	}

	if ( function_exists( 'get_sites' ) ) {
		// Account for get_sites() which uses 'number' while wp_get_sites() uses 'limit'.
		$args['number'] = $args['limit'];

		$sites = get_sites( $args );
	} else {
		$sites = array();
		foreach ( wp_get_sites( $args ) as $site ) { // @codingStandardsIgnoreLine Specifically for old version of WP first, in order to provide backward compatibility
			$sites[] = WP_Site::get_instance( $site['blog_id'] );
		}
	}

	return $sites;
}

/**
 * Check if Stream is running on WordPress.com VIP
 *
 * @return bool
 */
function wp_stream_is_vip() {
	return function_exists( 'wpcom_vip_load_plugin' );
}

/**
 * Check if the default front-end WP Cron is enabled. It doesn't
 * mean that the Cron is disabled in general.
 *
 * @return bool
 */
function wp_stream_is_cron_enabled() {
	return ( defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ) ? false : true;
}

/**
 * Get the asset min suffix if defined.
 *
 * @return string
 */
function wp_stream_min_suffix() {
	$min                 = '';
	$is_script_debugging = ! defined( 'SCRIPT_DEBUG' ) || false === SCRIPT_DEBUG;

	if ( apply_filters( 'wp_stream_load_min_assets', $is_script_debugging ) ) {
		$min = 'min.';
	}

	return $min;
}