<?php
/**
* The ApolaHelper class
*
* This class is responsible to provide all public additional functionality.
*
* @package WordPress
* @subpackage Apola
* @since Apola 1.0
*/

// Prevent the direct loading of the file
if ( ! defined( 'ABSPATH' ) ) {
	die( esc_html__('You cannot access this file directly', 'apola') );
}

class ApolaHelper
{
    /**
	 * The one, true instance of the Apola object.
	 *
	 * @static
	 * @access protected
	 * @var null|object
	 */
    protected static $instance;

    /**
	 * Returns the instance of the Apola class.
	 *
	 * @static
	 * @access public
     * @return Apola
	 */
    public static function getInstance() {
        if( !isset( self::$instance ) ) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    /**
	 * Returns sanitized html classes.
	 *
	 * @param array $classes
	 * @access public
     * @return string
	 */
    public function getSanitizedHtmlClasses($classes = array()) {
        return implode(' ', array_unique(array_map('sanitize_html_class', $classes)));
    }

    /**
	 * Returns main layout classes.
	 *
	 * @param string $sidebar_state
	 * @access public
     * @return string
	 */
    public function getMainLayoutClasses($sidebar_state = 'apo-no-sidebar') {
        $layout_classes = array(
			'main_column' => array(),
			'side_column' => array()
		);

		switch($sidebar_state) {
			case 'apo-no-sidebar' :
			case 'apo-full-width' :
				$layout_classes['main_column'] = array('col-xs-12');
			break;
			case 'apo-left-sidebar' :
				$layout_classes['main_column'] = array('col-sm-8', 'col-sm-push-4');
				$layout_classes['side_column'] = array('col-sm-4', 'col-sm-pull-8');
			break;
			case 'apo-right-sidebar' :
				$layout_classes['main_column'] = array('col-sm-8');
				$layout_classes['side_column'] = array('col-sm-4');
			break;
		}

		return $layout_classes;
    }

	/**
	 * Returns plain css string from the array of an element style.
	 *
	 * @param array $styles
	 * @access public
	 * @return string
	 */
	public function getCSSSetFromArray(array $styles = array())
	{
		$result = array();

		foreach($styles as $property => $value) {
		    if(!is_string($value)) continue;
		    array_push($result, sprintf('%s:%s;', $property, $value));
		}

		return implode('', $result);
	}

	/**
	 * Returns a plain CSS rule.
	 *
	 * @param string|array $selector
	 * @param array $properties
	 * @param array $media
	 * @access public
	 * @return string
	 */
	public function getPlainCSS($selector, array $properties = array(), array $media = array())
	{
		$plain = '';

		if(!count($properties)) return;

		if(is_array($selector)) $selector = implode(',', $selector);

		if(count($media) > 1) $plain .= sprintf('@media (%s: %s) {', $media[0], $media[1]);

			$plain .= sprintf('%s {%s}', $selector, $this->getCSSSetFromArray($properties));

		if(count($media) > 1) $plain .= '}';

		return $plain;
	}
}
?>