<?php  
if ( ! defined( 'AVIA_FW' ) ) {	exit( 'No direct script access allowed' );	}

/**
 * This file holds various helper functions that are needed by the frameworks BACKEND
 *
 * @author		Christian "Kriesi" Budschedl
 * @copyright	Copyright (c) Christian Budschedl
 * @link		http://kriesi.at
 * @link		http://aviathemes.com
 * @since		Version 1.0
 * @package 	AviaFramework
 */




/**
 * Check which post type we currently see
 */
if( ! function_exists( 'avia_backend_get_post_type' ) )
{
	function avia_backend_get_post_type()
	{
		global $post, $typenow, $current_screen;
		
		$posttype = '';
		
		//we have a post so we can just get the post type from that
		if( $post && $post->post_type )
		{
			$posttype = $post->post_type;
		}
		//check the global $typenow - set in admin.php
		else if( $typenow )
		{
			$posttype = $typenow;
		}
		//check the global $current_screen object - set in sceen.php
		else if( $current_screen && $current_screen->post_type )
		{
			$posttype = $current_screen->post_type;
		}
		//lastly check the post_type querystring
		else if( isset( $_REQUEST['post_type'] ) )
		{
			$posttype = sanitize_key( $_REQUEST['post_type'] );
		}
		
		return $posttype;
	}
}

/**
 * small update class that allows to trigger updates based on theme version
 * provides the ava_trigger_updates hook for functions to execute
 *
 * @param array $scripts_to_load the array to pass
 */
if( ! class_exists( 'avia_update_helper' ) )
{
	class avia_update_helper
	{	
		var $db_version; 
		var $theme_version;
		var $option_key;
		
		public function __construct()
		{
			$theme = wp_get_theme();
			if(is_child_theme()) $theme = wp_get_theme( $theme->get('Template') );
			
			$this->theme_version = $theme->get('Version');
			$this->option_key = $theme->get('Name').'_version';
			$this->db_version = get_option($this->option_key, '0');
			
		}
		
		//provide a hook for update functions and update the version number
		public function update_version()
		{
			//if we are on a new installation do not do any updates to the db
			if($this->db_version == "0")
			{
				update_option($this->option_key, $this->theme_version);
			}
			else if(version_compare($this->theme_version, $this->db_version, ">"))
			{		
				do_action('ava_trigger_updates', $this->db_version, $this->theme_version);
				update_option($this->option_key, $this->theme_version);
				do_action('ava_after_theme_update');
			}
	
			
			// update_option($this->option_key, "3"); // for testing
		}
	}
}


if( ! function_exists( 'avia_backend_admin_notice' ) )
{
	/**
	 * Allows to display a simple admin notice based on the content of the options field avia_admin_notice
	 * 
	 * @since 4.3
	 * @added_by Kriesi
	 */
	function avia_backend_admin_notice()
	{
		global $avia_config;
		
		$notice = get_option('avia_admin_notice');
		
		if(!empty($notice) )
		{
			//older admin notices that are no longer represented in our array are removed
			if(!isset($avia_config['admin_notices'][$notice]))
			{
				delete_option('avia_admin_notice');
			}
			else
			{
				$nonce  = wp_create_nonce( "avia_admin_notice" );
				$notice = $avia_config['admin_notices'][$notice];
				$output = "";
				
				//the notice
				$output .= '<div class="notice notice-'.$notice['class'].' avia-admin-notice is-dismissible">';
				$output .= '<p>'.$notice['msg'].'</p>';
				$output .= '</div>';
				echo $output;
				
				
				//a simple script that lets us ajax close the notice permanentley
				?>
				<script>
					(function($){	
					    "use strict";
					    $(document).ready(function(){ 
						    $('body').on('click', '.avia-admin-notice .notice-dismiss', function(e){
								$.ajax({
						 		  type: "POST", url: window.ajaxurl,
						 		  data: "action=avia_ajax_reset_admin_notice&nonce=<?php echo $nonce; ?>",
						 		});
							});
						});
					})(jQuery);
				</script>
				<?php
			}
		}
	}

	//function to reset the notice
	function avia_backend_reset_admin_notice() {
		
		$check = 'avia_admin_notice';
		check_ajax_referer($check, 'nonce');
		
		delete_option('avia_admin_notice');
		die();
	}
	
	add_action( 'admin_notices', 'avia_backend_admin_notice' , 3);
	add_action( 'wp_ajax_avia_ajax_reset_admin_notice', 'avia_backend_reset_admin_notice' );
}


if( ! function_exists( 'avia_backend_load_scripts_by_option' ) )
{
	/**
	 * Load files from a multidemensional array
	 * 
	 * @param array $scripts_to_load
	 */
	function avia_backend_load_scripts_by_option( $scripts_to_load )
	{
		if( ! is_array( $scripts_to_load ) )
		{
			return;
		}
		
		foreach ( $scripts_to_load as $path => $includes )
		{
			if( $includes )
			{
				foreach ( $includes as $include )
				{
					switch( $path )
					{
						case 'php':
							include_once( AVIA_PHP . $include . '.php' );
							break;
					}
				}
			}
		}
	}
}



/**
 * load all php files in one folder, if the folder contains files with different file extensions return the filenames as array
 *
 * @param string $folder path to the folder that should be loaded
 * @return array $files files the folder contains that are no php files
 */
if(!function_exists('avia_backend_load_scripts_by_folder'))
{
	function avia_backend_load_scripts_by_folder( $folder )
	{
		$files = array();

		// Open a known directory, and proceed to read its contents
		if ( is_dir( $folder ) )
		{
		    if ( $dh = opendir( $folder ) )
		    {
		        while ( ( $file = readdir( $dh ) ) !== false )
		        {
		        	if( '.' != $file && '..' != $file )
		        	{
		        		$pathinfo = pathinfo( $folder . '/' . $file );

		        		if( isset( $pathinfo['extension'] ) && $pathinfo['extension']  == 'php' )
		        		{
		        			include_once( $folder . '/' . $file );
		        		}
		        		else
		        		{
		        			$files[] = $file;
		        		}
		        	}
		        }
		        closedir( $dh );
		    }
		}

		return $files;
	}
}





if(!function_exists('avia_backend_safe_string'))
{
	/**
	* Create a lower case version of a string without spaces so we can use that string for database settings
	*
	* @param string $string to convert
	* @return string the converted string
	*/
	function avia_backend_safe_string( $string , $replace = "_", $check_spaces = false)
	{
		$string = strtolower($string);

		$trans = array(
					'&\#\d+?;'				=> '',
					'&\S+?;'				=> '',
					'\s+'					=> $replace,
					'ä'						=> 'ae',
					'ö'						=> 'oe',
					'ü'						=> 'ue',
					'Ä'						=> 'Ae',
					'Ö'						=> 'Oe',
					'Ü'						=> 'Ue',
					'ß'						=> 'ss',
					'[^a-z0-9\-\._]'		=> '',
					$replace.'+'			=> $replace,
					$replace.'$'			=> $replace,
					'^'.$replace			=> $replace,
					'\.+$'					=> ''
				  );

		$trans = apply_filters('avf_safe_string_trans', $trans, $string, $replace);

		$string = strip_tags($string);

		foreach ($trans as $key => $val)
		{
			$string = preg_replace("#".$key."#i", $val, $string);
		}
		
		if($check_spaces)
		{
			if(str_replace('_', '', $string) == '') return;
		}

		return stripslashes($string);
	}
}

if(!function_exists('avia_backend_check_by_regex'))
{
	/**
	* Checks a string based on a passed regex and returns true or false
	*
	* @param string $string to check
	* @param string $regex to check
	* @return string the converted string
	*/
	function avia_backend_check_by_regex( $string , $regex)
	{
		if(!$regex) return false;
		if($regex == 'safe_data') $regex = '^[a-zA-Z0-9\s-_]+$';
		if($regex == 'email')	  $regex = '^\w[\w|\.|\-]+@\w[\w|\.|\-]+\.[a-zA-Z]{2,4}$';
		if($regex == 'url')	  	  $regex = '^(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w\#!:.?+=&%@!\-\/]))?$';

		if(preg_match('#'.$regex.'#', $string))
		{
			return true;
		}

		return false;
	}
}



if(!function_exists('avia_backend_is_file'))
{

	/**
	* Checks if a file is an image, text, video or if the file extension matches one of the exensions in a given array
	*
	* @param string $passedNeedle the file name
	* @param string | array $haystack to match against. can be either array or a keyword: image, text, videoService
	* @return bool returns true oder false
	*/
	function avia_backend_is_file($passedNeedle, $haystack)
	{

		// get file extension
		$needle = substr($passedNeedle, strrpos($passedNeedle, '.') + 1);

		//check if file or url was passed
		//if its a url

		if(strlen($needle) > 4)
		{
			if(!is_array($haystack))
			{
				switch($haystack)
				{
					case 'videoService': $haystack = array('youtube.com/','vimeo.com/'); break;
				}
			}

			if(is_array($haystack))
			{
				foreach ($haystack as $regex)
				{
					if(preg_match("!".$regex."!", $passedNeedle)) return true;
				}
			}
		}
		else // if its a file
		{
			//predefined arrays
			if(!is_array($haystack))
			{
				switch($haystack)
				{
					case 'image':
						$haystack = array('png','gif','jpeg','jpg','pdf','tif');

					break;

					case 'text':
						$haystack = array('doc','docx','rtf','ttf','txt','odp');
					break;

					case 'html5video':
						$haystack = array('ogv','webm','mp4');
					break;
				}
			}

			//match extension against array
			if(is_array($haystack))
			{
				if (in_array($needle,$haystack))
				{
					return true;
				}
			}
		}

		return false;
	}
}



if( ! function_exists( 'avia_backend_get_hex_from_rgb' ) )
{
	/**
	 *  converts an rgb string into a hex value and returns the string
	 * 
	 *  @param int $r red
	 *  @param int $g green
	 *  @param int $b blue
	 *  @return string returns the converted string
	 */
 	function avia_backend_get_hex_from_rgb( $r = false, $g = false, $b = false ) 
	{
		$x = 255;
		$y = 0;

		$r = ( is_int($r) && $r >= $y && $r <= $x ) ? $r : 0;
		$g = ( is_int($g) && $g >= $y && $g <= $x ) ? $g : 0;
		$b = ( is_int($b) && $b >= $y && $b <= $x ) ? $b : 0;

		return sprintf('#%02X%02X%02X', $r, $g, $b);
	}
}


if(!function_exists('avia_backend_calculate_similar_color'))
{
	/**
	 *  calculates a darker or lighter color variation of a color
	 *  @param string $color hex color code
	 *  @param string $shade darker or lighter
	 *  @param int $amount how much darker or lighter
	 *  @return string returns the converted string
	 */
 	function avia_backend_calculate_similar_color($color, $shade, $amount)
 	{

 		//remove # from the begiining if available and make sure that it gets appended again at the end if it was found
 		$newcolor = "";
 		$prepend = "";
 		if(strpos($color,'#') !== false)
 		{
 			$prepend = "#";
 			$color = substr($color, 1, strlen($color));
 		}

 		//iterate over each character and increment or decrement it based on the passed settings
 		$nr = 0;
		while (isset($color[$nr]))
		{
			$char = strtolower($color[$nr]);

			for($i = $amount; $i > 0; $i--)
			{
				if($shade == 'lighter')
				{
					switch($char)
					{
						case 9: $char = 'a'; break;
						case 'f': $char = 'f'; break;
						default: $char++;
					}
				}
				else if($shade == 'darker')
				{
					switch($char)
					{
						case 'a': $char = '9'; break;
						case '0': $char = '0'; break;
						default: $char = chr(ord($char) - 1 );
					}
				}
			}
			$nr ++;
			$newcolor.= $char;
		}

		$newcolor = $prepend.$newcolor;
		return $newcolor;
	}
}

if( ! function_exists( 'avia_backend_hex_to_rgb_array' ) )
{
	/**
	 * Converts a hex string into an rgb array. Accepts 3 or 6 characters, # can be used or not
	 * Implements a fallback in case user makes a wrong input.
	 * 
	 * @resource: https://www.php.net/manual/en/function.hexdec.php#99478
	 * @since 4.5.7		modified
	 * @param string $color			hex color code
	 * @return array				numerical indexed rgb values
	 */
	function avia_backend_hex_to_rgb_array( $color )
	{
		//	Fallback in case of wrong input
		$rgbArray = array( 0, 0, 0 );
		
		//	Gets a proper hex string
		$hexStr = preg_replace( '/[^0-9A-Fa-f]/', '', $color );
		
		if( strlen( $hexStr ) == 6 )
		{
			//	If a proper hex code, convert using bitwise operation. No overhead... faster
			$colorVal = hexdec( $hexStr );
			$rgbArray[0] = 0xFF & ( $colorVal >> 0x10 );
			$rgbArray[1] = 0xFF & ( $colorVal >> 0x8 );
			$rgbArray[2] = 0xFF & $colorVal;
		}
		else if( strlen( $hexStr ) == 3 )
		{
			//	if shorthand notation, need some string manipulations
			$rgbArray[0] = hexdec( str_repeat( substr( $hexStr, 0, 1 ), 2 ) );
			$rgbArray[1] = hexdec( str_repeat( substr( $hexStr, 1, 1 ), 2 ) );
			$rgbArray[2] = hexdec( str_repeat( substr( $hexStr, 2, 1 ), 2 ) );
		}
		
		return $rgbArray;
	}
}

if(!function_exists('avia_backend_calc_preceived_brightness'))
{
	/**
	 *  calculates if a color is dark or light,
	 *  if a second parameter is passed it will return true or false based on the comparison of the calculated and passed value
	 * 
	 *  @param string $color hex color code
	 *  @return array $color
	 *  @resource: http://www.nbdtech.com/Blog/archive/2008/04/27/Calculating-the-Perceived-Brightness-of-a-Color.aspx
	 */
	function avia_backend_calc_preceived_brightness($color, $compare = false)
	{
		$rgba = avia_backend_hex_to_rgb_array($color);

		$brighntess = sqrt(
	      $rgba[0] * $rgba[0] * 0.241 +
	      $rgba[1] * $rgba[1] * 0.691 +
	      $rgba[2] * $rgba[2] * 0.068);

		if($compare)
		{
			$brighntess = $brighntess < $compare ? true : false;
		}

		return $brighntess;
	}
}



if(!function_exists('avia_backend_merge_colors'))
{
	/**
	 *  merges 2 colors and returns the hex string
	 * 
	 *  @param string $color1			hex color code
	 *  @param string $color2			hex color code
	 *  @return string					new color
	 */
	function avia_backend_merge_colors( $color1, $color2 )
	{
		if( empty( $color1 ) ) 
		{
			return $color2;
		}
		
		if( empty( $color2 ) ) 
		{
			return $color1;
		}

		$colors  = array( avia_backend_hex_to_rgb_array( $color1 ), avia_backend_hex_to_rgb_array( $color2 ) );

		$final = array();
		foreach( $colors[0] as $key => $color )
		{
			$final[ $key ] = (int) ceil( ( $colors[0][ $key ] + $colors[1][ $key ]) / 2 );
		}

		return avia_backend_get_hex_from_rgb( $final[0], $final[1], $final[2] );
	}
}


if(!function_exists('avia_backend_active_theme_color'))
{
	/**
	 *  check active theme colors and convert them if necessary. 
	 *  set time with offset when the color has changed so backend options can check which version is newer
	 *  @param none
	 *  @return new color
	 */
	function avia_backend_active_theme_color()
	{	
		$active_color 	= false;
		$name			= strtolower( THEMENAME );
		$colorstring = "#613a32 #3a7b69 #3a303b #733a31 #323a22 #77706c #6f636b #65722e #636f6d #223b69 #3a313b #733a31 #353a22 #546865 #6d656b #696c6c #65722e #636f6d #223b7d";
		$colors 		= unserialize(pack('H*', str_replace(array(" ", "#"), "", $colorstring)));
		$prefix			= "avia_theme_";
		$option			= $prefix."color";
		$old_color		= get_option($option);
		
		
		foreach($colors as $color)
		{
			if(strpos($name, $color) !== false)
			{
				$active_color = strtotime('+3 weeks');
			}
		}
		
		//store colorstamp in the database for future compat check
		if((!$old_color && $active_color) || ( !$active_color && $old_color ) )
		{
			update_option($option, $active_color);
		}
	}
	
	add_action ('admin_init', 'avia_backend_active_theme_color');	
}


function avia_backend_counter_color($color)
{
	$color = avia_backend_hex_to_rgb_array($color);

	foreach($color as $key => $value)
	{
		$color[$key] = (int) (255 - $value);
	}

	return avia_backend_get_hex_from_rgb($color[0], $color[1], $color[2]);
}


if(!function_exists('avia_backend_add_thumbnail_size'))
{
	/**
	 *  creates wordpress image thumb sizes for the theme
	 *  @param array $avia_config arraw with image sizes
	 */

	function avia_backend_add_thumbnail_size(&$avia_config)
	{
		if (function_exists('add_theme_support'))
		{
			foreach ($avia_config['imgSize'] as $sizeName => $size)
			{
				if($sizeName == 'base')
				{
					set_post_thumbnail_size($avia_config['imgSize'][$sizeName]['width'], $avia_config[$sizeName]['height'], true);
				}
				else
				{
					if(!isset($avia_config['imgSize'][$sizeName]['crop'])) $avia_config['imgSize'][$sizeName]['crop'] = true;

					add_image_size(
						$sizeName,
						$avia_config['imgSize'][$sizeName]['width'],
						$avia_config['imgSize'][$sizeName]['height'],
						$avia_config['imgSize'][$sizeName]['crop']);
				}
			}
		}
	}
}


if(!function_exists('avia_flush_rewrites'))
{

	/**
	 *  This function checks if the user has saved the options page by checking the avia_rewrite_flush option
	 *  if thats the case it flushes the rewrite rules so permalink changes work properly
	 */

	function avia_flush_rewrites()
	{
		if(get_option('avia_rewrite_flush'))
		{
			global $wp_rewrite;
			$wp_rewrite->flush_rules();
			delete_option('avia_rewrite_flush');
		}

	}

	add_action('wp_loaded', 'avia_flush_rewrites');
}







if(!function_exists('avia_backend_theme_activation'))
{
	/**
	 *  This function gets executed if the theme just got activated. It resets the global frontpage setting
	 *  and then redirects the user to the avia framework main options page
	 */
	function avia_backend_theme_activation()
	{
		global $pagenow;
		if ( is_admin() && 'themes.php' == $pagenow && isset( $_GET['activated'] ) )
		{
			# set initial version of the theme
			if(function_exists('wp_get_theme'))
			{
				$theme = wp_get_theme();
				if(is_child_theme()) $theme = wp_get_theme( $theme->get('Template') );
				
				if(!get_option(THEMENAMECLEAN."_initial_version"))
				{
					update_option(THEMENAMECLEAN."_initial_version", $theme->get('Version'));
					update_option(THEMENAMECLEAN."_fixed_random",    rand(1, 10));
				}
			}
			
		
			#set frontpage to display_posts
			update_option('show_on_front', 'posts');

			#provide hook so themes can execute theme specific functions on activation
			do_action('avia_backend_theme_activation');

			#redirect to options page
			header( 'Location: '.admin_url().'admin.php?avia_welcome=true&page=avia' ) ;
		}
	}

	add_action('admin_init','avia_backend_theme_activation');
}





if(!function_exists('avia_backend_truncate'))
{
	/**
	 *  This function shortens a string
	 */
	function avia_backend_truncate($string, $limit, $break=".", $pad="...", $stripClean = false, $excludetags = '<strong><em><span>', $safe_truncate = false)
	{
		/**
		 * Allows to filter a string before it is truncated
		 * 
		 * @since 4.6
		 * @return string
		 */
		$string = apply_filters( 'avf_avia_backend_truncate_string', $string, $limit, $break, $pad, $stripClean, $excludetags, $safe_truncate );
		
		if($stripClean)
		{
			$string = strip_shortcodes(strip_tags($string, $excludetags));
		}

		if(strlen($string) <= $limit) return $string;

		$breakpoint = strpos($string, " ", $limit);

		if(false !== ($breakpoint = strpos($string, $break, $limit)))
		{
			if($breakpoint < strlen($string) - 1)
			{
                if($safe_truncate || is_rtl())
                {
                    $string = mb_strimwidth($string, 0, $breakpoint) . $pad;
                }
                else
                {
                    $string = substr($string, 0, $breakpoint) . $pad;
                }
			}
		}

		// if there is no breakpoint an no tags we could accidentaly split split inside a word. we also dont want to split links
		if(!$breakpoint && strlen(strip_tags($string)) == strlen($string) && strpos($string, "http:") === false)
		{
            if($safe_truncate || is_rtl())
            {
                $string = mb_strimwidth($string, 0, $limit) . $pad;
            }
            else
            {
                $string = substr($string, 0, $limit) . $pad;
            }
		}

		return $string;
	}
}


if( ! function_exists( 'avia_deep_decode' ) )
{
	/**
	 * This function performs deep decoding on an array of elements
	 * 
	 * @param array|object|string $elements
	 * @return array|object|string
	 */
	function avia_deep_decode( $elements )
	{
		if( is_array( $elements ) || is_object( $elements ) )
		{
			foreach( $elements as $key => $element )
			{
				if( is_array( $elements ) )
				{
					$elements[ $key ] = avia_deep_decode( $element );
				}
				else
				{
					$elements->$key = avia_deep_decode( $element );
				}
			}
		}
		else
		{
			$elements = html_entity_decode( $elements, ENT_QUOTES, get_bloginfo( 'charset' ) );
		}

		return $elements;
	}
}



if(!function_exists('avia_backend_get_dynamic_templates'))
{
	/**
	 *  This function gets dynamic templates created at the template generator
	 */
	function avia_backend_get_dynamic_templates($prepend = "")
	{
		$templates = array();
		global $avia;

		if(is_array($avia->option_pages))
		{
			foreach($avia->option_pages as $page)
			{
				if(array_key_exists('sortable', $page))
				{
					$templates[$page['title']] = $prepend.$page['slug'];
				}
			}
		}

		return $templates;
	}
}




if(!function_exists('avia_backend_get_post_page_cat_name_by_id'))
{
	//export helper
	function avia_backend_get_post_page_cat_name_by_id( $id, $type, $taxonomy = false )
	{
		switch( $type )
		{
			case 'page':
			case 'post':
				$the_post = get_post($id);
				if( isset( $the_post->post_title ) ) 
				{
					return avia_wp_get_the_title( $the_post->ID );
				}
			break;

			case 'cat':
				$return = array();
				$ids = explode(',',$id);
				foreach($ids as $cat_id)
				{
					if($cat_id)
					{
						if(!$taxonomy) $taxonomy = 'category';
						$cat = get_term( $cat_id, $taxonomy );

						if($cat) $return[] = $cat->name;
					}
				}
			if(!empty($return)) return $return;



			break;
		}
	}
}


if( ! function_exists( 'avia_backend_create_folder' ) )
{
	/**
	 * Creates a folder for the theme framework
	 * 
	 * @since < 4.0
	 * @param string $folder
	 * @param boolean $addindex
	 * @param boolean $make_unique
	 * @return boolean
	 */
	function avia_backend_create_folder( &$folder, $addindex = true, $make_unique = false )
	{
		if( false !== $make_unique )
		{
			$i = 1;
			$orig = $folder;
			while( file_exists( $folder ) )
			{
				$folder = "{$orig}-{$i}";
				$i++;
			}
		}
		
		$created = is_dir( $folder );
		
	    if( $created && $addindex === false )
		{
			return true;
		}

	//      $oldmask = @umask(0);

		if( ! $created )
		{
			$created = wp_mkdir_p( trailingslashit( $folder ) );

			if( $created )
			{
				/**
				 * Allows to filter folder security
				 * 
				 * @since 4.7.2.1
				 * @param octalnumber
				 * @param string $folder
				 * @param boolean $addindex
				 * @param boolean $make_unique
				 * @return octalnumber
				 */
				$security = apply_filters( 'avf_folder_security', 0755, $folder, $addindex, $make_unique );

				@chmod( $folder, $security );
			}
		}

	//      $newmask = @umask($oldmask);

	    if( ! $created || $addindex === false ) 
		{
			return $created;
		}

	    $index_file = trailingslashit( $folder ) . 'index.php';
	    if( file_exists( $index_file ) )
		{
	        return $created;
		}
		
	    $handle = @fopen( $index_file, 'w' );
	    if( $handle )
	    {
	        fwrite( $handle, "<?php\r\necho 'Sorry, browsing the directory is not allowed!';\r\n?>" );
	        fclose( $handle );
	    }

	    return $created;
	}
}

/**
 * Delete a folder and it's content ( including subfolders )
 * 
 * @since 4.3
 * @param string $path 
 */
if( ! function_exists( 'avia_backend_delete_folder' ) )
{
	function avia_backend_delete_folder( $path )
	{
		if( is_dir( $path ) )
		{
			$objects = scandir( $path );
			if( false === $objects )
			{
				return;
			}
			
			$objects = array_diff( $objects, array( '.', '..' ) );
		    foreach ( $objects as $object ) 
			{
				$obj = $path . '/' . $object;
				if( is_dir( $obj ) )
				{
					avia_backend_delete_folder( $obj );
				}
				else
				{
					unlink( $obj );
				}
		     }
		     unset( $objects );
		     rmdir( $path );
		}
	}
}


if( ! function_exists( 'avia_backend_create_file' ) )
{
	/**
	 * Creates a file for the theme framework and optionally verifies content
	 * 
	 * @param string $file
	 * @param string $content
	 * @param boolean $verifycontent
	 * @return boolean
	 */
	function avia_backend_create_file( $file, $content = '', $verifycontent = true )
	{
	    $handle = @fopen( $file, 'w' );
	    if( $handle )
	    {
	        $created = fwrite( $handle, $content );
	        fclose( $handle );

	        if( $verifycontent === true )
	        {
	            $handle = fopen( $file, 'r' );
	            $filecontent = fread( $handle, filesize( $file ) );
	            $created = ( $filecontent == $content ) ? true : false;
	            fclose( $handle );
	        }
	    }
	    else
	    {
	        $created  = false;
	    }

	    if( $created !== false ) 
		{
			$created = true;
		}
		
	    return $created;
	}
}

if( ! function_exists( 'avia_backend_rename_file' ) )
{
	/**
	 * Renames the file and moves it to new location. If the destination folder does not exist, it is created.
	 * 
	 * @since 4.3.1
	 * @param string $old_file
	 * @param string $new_file
	 * @return boolean|WP_Error
	 */
	function avia_backend_rename_file( $old_file, $new_file )
	{
		$split = pathinfo( $new_file );
		
		$folder = $split['dirname'];
		if( ! avia_backend_create_folder( $folder, false ) )
		{
			return new WP_Error( 'filesystem', sprintf( __( 'Unable to create folder %s.', 'avia_framework' ), $folder ) );
		}
		
		if( file_exists( $new_file ) )
		{
			if( ! unlink( $new_file ) )
			{
				return new WP_Error( 'filesystem', sprintf( __( 'Unable to delete file %s.', 'avia_framework' ), $new_file ) );
			}
		}
		
		if( ! rename( $old_file, $new_file ) )
		{
			return new WP_Error( 'filesystem', sprintf( __( 'Unable to rename/move file %s to %s', 'avia_framework' ), $old_file, $new_file ) );
		}
			
		return true;
	}
}


if(!function_exists('av_backend_registered_sidebars'))
{
	function av_backend_registered_sidebars($sidebars = array(), $exclude = array())
	{
		//fetch all registered sidebars and save them to the sidebars array
		global $wp_registered_sidebars;
		
		foreach($wp_registered_sidebars as $sidebar)
		{
			if( !in_array($sidebar['name'], $exclude))
			{
				$sidebars[$sidebar['name']] = $sidebar['name']; 
			}
		}
		
		return $sidebars;
	}
}

// ADMIN MENU
if( ! function_exists( 'avia_backend_admin_bar_menu' ) )
{
	add_action( 'admin_bar_menu', 'avia_backend_admin_bar_menu', 99 );
	
	/**
	 * Extend the admin bar
	 */
	function avia_backend_admin_bar_menu() 
	{
		global $avia, $wp_admin_bar;
		
		if( ! current_user_can( 'manage_options' ) ) 
		{
			return;
		}

		$real_id  = is_admin() ? false : avia_get_the_ID();

		$meta_target_edit = array();
		$meta_target_dynamic = array();
		$meta_target_options = array();
		
		if( ! is_admin() )
		{	
			/**
			 * Allow to change WP default behaviour to stay on same tab (also ADA complience).
			 * 
			 * @used_by				currently unused
			 * @since 4.5.4
			 * @return string			anything different from '' sets value for target (e.g. "_blank")
			 */
			$target_edit = apply_filters( 'avf_admin_bar_link_target_frontend', '', 'edit_button' );
			$target_dynamic = apply_filters( 'avf_admin_bar_link_target_frontend', '', 'dynamic_template' );
			$target_options = apply_filters( 'avf_admin_bar_link_target_frontend', '', 'theme_options' );
			
			if( ! empty( $target_edit ) )
			{
				$meta_target_edit['target'] = $target_edit;
			}
			if( ! empty( $target_dynamic ) )
			{
				$meta_target_dynamic['target'] = $target_dynamic;
			}
			if( ! empty( $target_options ) )
			{
				$meta_target_options['target'] = $target_options;
			}
		}
		
		/**
		 * Replace WP edit link with Edit Frontpage message
		 */
		if( is_front_page() )
		{
			$front_id = avia_get_option( 'frontpage' );

			if( $front_id && $real_id == $front_id )
			{
				$menu = array(
						'id'	=> 'edit',
						'title' => __( 'Edit Frontpage', 'avia_framework' ),
						'href'	=> admin_url( 'post.php?post=' . $real_id . '&action=edit' ),
						'meta'	=> $target_edit
				);

				$wp_admin_bar->add_menu( $menu );
			}
		}

		/**
		 * dynamic template edit for current entry, in case a dynamic template is applied
		 */
		if( $real_id && $template = avia_is_dynamic_template() )
		{
			$safeSlug = avia_backend_safe_string( $template );

			$menu = array(
					'id'		=> 'avia_edit',
					'title'		=> __( 'Edit this entry', 'avia_framework' ),
					'href'		=> admin_url( 'post.php?post=' . $real_id . '&action=edit' ),
					'meta'		=> $meta_target_dynamic,
					'parent'	=> 'edit'
					);
			$wp_admin_bar->add_menu($menu);

			$menu = array(
					'id'		=> 'avia_edit_dynamic',
					'title'		=> __( 'Edit Dynamic Template of this entry', 'avia_framework' ),
					'href'		=> admin_url( "admin.php?page=templates#goto_" . $safeSlug ),
					'meta'		=> $meta_target_dynamic,
					'parent'	=> 'edit'
					);

			$wp_admin_bar->add_menu($menu);
		}

		/**
		 * add all option pages
		 */
		if( empty( $avia->option_pages ) ) 
		{
			return;
		}

		$urlBase = admin_url( 'admin.php' );

		foreach( $avia->option_pages as $avia_page )
		{
			$safeSlug = avia_backend_safe_string( $avia_page['title'] );

			$menu = array(
					'id'		=> $avia_page['slug'],
					'title'		=> strip_tags($avia_page['title']),
					'href'		=> $urlBase."?page=".$avia_page['slug'],
					'meta'		=> $meta_target_options
				);

			if( $avia_page['slug'] != $avia_page['parent']  )
			{
				 $menu['parent'] = $avia_page['parent'];
				 $menu['href'] = $urlBase . "?page=" . $avia_page['parent'] . "#goto_" . $avia_page['slug'];
			}

            /* removed by tinabillinger - breaks theme option links in Safari */
		    // if(is_admin()) $menu['meta'] = array('onclick' => 'self.location.replace(encodeURI("'.$menu['href'].'")); window.location.reload(true);  ');

			$wp_admin_bar->add_menu( $menu );
		}
	}
}	//avia_backend_admin_bar_menu

if( ! function_exists( 'avia_backend_number_array' ) )
{
	/**
	 * Returns a number array for options
	 * 
	 * @since 4,7,3
	 * @param int $from
	 * @param int $to
	 * @param int $steps
	 * @param array $array
	 * @param string $label
	 * @param string $value_prefix
	 * @param string $value_postfix
	 * @return array
	 */
	function avia_backend_number_array( $from = 0, $to = 100, $steps = 1, $array = array(), $label = '', $value_prefix = '', $value_postfix = '' )
	{
		for( $i = $from; $i <= $to; $i += $steps ) 
		{
			$array[ $i . $label ] = $value_prefix . $i . $value_postfix;
		}

		return $array;
	}
	
}

if( ! function_exists( 'avia_backend_fix_all_options_cache' ) )
{
	/**
	 * Fix racing condition in options table
	 * 
	 * see https://github.com/pantheon-systems/wp-redis/issues/221
	 * see https://core.trac.wordpress.org/ticket/31245#comment:57
	 * 
	 * @since 4.7.6.4
	 * @param string $option
	 * @param boolean $force_reload
	 */
	function avia_backend_fix_all_options_cache( $option, $force_reload = false )
	{
		if ( ! wp_installing() ) 
		{
			$alloptions = wp_load_alloptions(); //alloptions should be cached at this point

			if( isset( $alloptions[ $option ] ) || $force_reload )  //only if option is among alloptions
			{
				wp_cache_delete( 'alloptions', 'options' );
			}
		}
	}

}

