<?php
/**
 * Twenty Sixteen functions and definitions
 *
 * Set up the theme and provides some helper functions, which are used in the
 * theme as custom template tags. Others are attached to action and filter
 * hooks in WordPress to change core functionality.
 *
 * When using a child theme you can override certain functions (those wrapped
 * in a function_exists() call) by defining them first in your child theme's
 * functions.php file. The child theme's functions.php file is included before
 * the parent theme's file, so the child theme functions would be used.
 *
 * @link https://codex.wordpress.org/Theme_Development
 * @link https://codex.wordpress.org/Child_Themes
 *
 * Functions that are not pluggable (not wrapped in function_exists()) are
 * instead attached to a filter or action hook.
 *
 * For more information on hooks, actions, and filters,
 * {@link https://codex.wordpress.org/Plugin_API}
 *
 * @package WordPress
 * @subpackage Twenty_Sixteen
 * @since Twenty Sixteen 1.0
 */

/**
 * Twenty Sixteen only works in WordPress 4.4 or later.
 */
if ( version_compare( $GLOBALS['wp_version'], '4.4-alpha', '<' ) ) {
	require get_template_directory() . '/inc/back-compat.php';
}

if ( ! function_exists( 'twentysixteen_setup' ) ) :
/**
 * Sets up theme defaults and registers support for various WordPress features.
 *
 * Note that this function is hooked into the after_setup_theme hook, which
 * runs before the init hook. The init hook is too late for some features, such
 * as indicating support for post thumbnails.
 *
 * Create your own twentysixteen_setup() function to override in a child theme.
 *
 * @since Twenty Sixteen 1.0
 */
function twentysixteen_setup() {
	/*
	 * Make theme available for translation.
	 * Translations can be filed in the /languages/ directory.
	 * If you're building a theme based on Twenty Sixteen, use a find and replace
	 * to change 'twentysixteen' to the name of your theme in all the template files
	 */
	load_theme_textdomain( 'twentysixteen', get_template_directory() . '/languages' );

	// Add default posts and comments RSS feed links to head.
	add_theme_support( 'automatic-feed-links' );

	/*
	 * Let WordPress manage the document title.
	 * By adding theme support, we declare that this theme does not use a
	 * hard-coded <title> tag in the document head, and expect WordPress to
	 * provide it for us.
	 */
	add_theme_support( 'title-tag' );

	/*
	 * Enable support for custom logo.
	 *
	 *  @since Twenty Sixteen 1.2
	 */
	add_theme_support( 'custom-logo', array(
		'height'      => 240,
		'width'       => 240,
		'flex-height' => true,
	) );

	/*
	 * Enable support for Post Thumbnails on posts and pages.
	 *
	 * @link http://codex.wordpress.org/Function_Reference/add_theme_support#Post_Thumbnails
	 */
/*	add_theme_support( 'post-thumbnails' );
	set_post_thumbnail_size( 1200, 9999, true );*/
	if ( function_exists( 'add_theme_support' ) ) {
    add_theme_support( 'post-thumbnails' );
        set_post_thumbnail_size( 1200, 9999 ); // default Post Thumbnail dimensions
}

if ( function_exists( 'add_image_size' ) ) {
    add_image_size( 'first-thumb', 799, 490, true ); //300 pixels wide (and unlimited height)
    add_image_size( 'other-thumb', 384, 267, true ); //(cropped)
}


	// This theme uses wp_nav_menu() in two locations.
	register_nav_menus( array(
		'primary' => __( 'Primary Menu', 'twentysixteen' ),
		'social'  => __( 'Social Links Menu', 'twentysixteen' ),
	) );

	/*
	 * Switch default core markup for search form, comment form, and comments
	 * to output valid HTML5.
	 */
	add_theme_support( 'html5', array(
		'search-form',
		'comment-form',
		'comment-list',
		'gallery',
		'caption',
	) );

	/*
	 * Enable support for Post Formats.
	 *
	 * See: https://codex.wordpress.org/Post_Formats
	 */
	add_theme_support( 'post-formats', array(
		'aside',
		'image',
		'video',
		'quote',
		'link',
		'gallery',
		'status',
		'audio',
		'chat',
	) );

	/*
	 * This theme styles the visual editor to resemble the theme style,
	 * specifically font, colors, icons, and column width.
	 */
	add_editor_style( array( 'css/editor-style.css', twentysixteen_fonts_url() ) );

	// Indicate widget sidebars can use selective refresh in the Customizer.
	add_theme_support( 'customize-selective-refresh-widgets' );
}
endif; // twentysixteen_setup
add_action( 'after_setup_theme', 'twentysixteen_setup' );

/**
 * Sets the content width in pixels, based on the theme's design and stylesheet.
 *
 * Priority 0 to make it available to lower priority callbacks.
 *
 * @global int $content_width
 *
 * @since Twenty Sixteen 1.0
 */
function twentysixteen_content_width() {
	$GLOBALS['content_width'] = apply_filters( 'twentysixteen_content_width', 840 );
}
add_action( 'after_setup_theme', 'twentysixteen_content_width', 0 );

/**
 * Registers a widget area.
 *
 * @link https://developer.wordpress.org/reference/functions/register_sidebar/
 *
 * @since Twenty Sixteen 1.0
 */
function twentysixteen_widgets_init() {
	register_sidebar( array(
		'name'          => __( 'Sidebar', 'twentysixteen' ),
		'id'            => 'sidebar-1',
		'description'   => __( 'Add widgets here to appear in your sidebar.', 'twentysixteen' ),
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );

	register_sidebar( array(
		'name'          => __( 'Content Bottom 1', 'twentysixteen' ),
		'id'            => 'sidebar-2',
		'description'   => __( 'Appears at the bottom of the content on posts and pages.', 'twentysixteen' ),
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );

	register_sidebar( array(
		'name'          => __( 'Content Bottom 2', 'twentysixteen' ),
		'id'            => 'sidebar-3',
		'description'   => __( 'Appears at the bottom of the content on posts and pages.', 'twentysixteen' ),
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );
}
add_action( 'widgets_init', 'twentysixteen_widgets_init' );

if ( ! function_exists( 'twentysixteen_fonts_url' ) ) :
/**
 * Register Google fonts for Twenty Sixteen.
 *
 * Create your own twentysixteen_fonts_url() function to override in a child theme.
 *
 * @since Twenty Sixteen 1.0
 *
 * @return string Google fonts URL for the theme.
 */
function twentysixteen_fonts_url() {
	$fonts_url = '';
	$fonts     = array();
	$subsets   = 'latin,latin-ext';

	/* translators: If there are characters in your language that are not supported by Merriweather, translate this to 'off'. Do not translate into your own language. */
	if ( 'off' !== _x( 'on', 'Merriweather font: on or off', 'twentysixteen' ) ) {
		$fonts[] = 'Merriweather:400,700,900,400italic,700italic,900italic';
	}

	/* translators: If there are characters in your language that are not supported by Montserrat, translate this to 'off'. Do not translate into your own language. */
	if ( 'off' !== _x( 'on', 'Montserrat font: on or off', 'twentysixteen' ) ) {
		$fonts[] = 'Montserrat:400,700';
	}

	/* translators: If there are characters in your language that are not supported by Inconsolata, translate this to 'off'. Do not translate into your own language. */
	if ( 'off' !== _x( 'on', 'Inconsolata font: on or off', 'twentysixteen' ) ) {
		$fonts[] = 'Inconsolata:400';
	}

	if ( $fonts ) {
		$fonts_url = add_query_arg( array(
			'family' => urlencode( implode( '|', $fonts ) ),
			'subset' => urlencode( $subsets ),
		), 'https://fonts.googleapis.com/css' );
	}

	return $fonts_url;
}
endif;

/**
 * Handles JavaScript detection.
 *
 * Adds a `js` class to the root `<html>` element when JavaScript is detected.
 *
 * @since Twenty Sixteen 1.0
 */
function twentysixteen_javascript_detection() {
	echo "<script>(function(html){html.className = html.className.replace(/\bno-js\b/,'js')})(document.documentElement);</script>\n";
}
add_action( 'wp_head', 'twentysixteen_javascript_detection', 0 );

/**
 * Enqueues scripts and styles.
 *
 * @since Twenty Sixteen 1.0
 */
function twentysixteen_scripts() {
	// Add custom fonts, used in the main stylesheet.
	wp_enqueue_style( 'twentysixteen-fonts', twentysixteen_fonts_url(), array(), null );

	// Add Genericons, used in the main stylesheet.
	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '3.4.1' );

	// Theme stylesheet.
	wp_enqueue_style( 'twentysixteen-style', get_stylesheet_uri() );

	// Load the Internet Explorer specific stylesheet.
	wp_enqueue_style( 'twentysixteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentysixteen-style' ), '20160412' );
	wp_style_add_data( 'twentysixteen-ie', 'conditional', 'lt IE 10' );

	// Load the Internet Explorer 8 specific stylesheet.
	wp_enqueue_style( 'twentysixteen-ie8', get_template_directory_uri() . '/css/ie8.css', array( 'twentysixteen-style' ), '20160412' );
	wp_style_add_data( 'twentysixteen-ie8', 'conditional', 'lt IE 9' );

	// Load the Internet Explorer 7 specific stylesheet.
	wp_enqueue_style( 'twentysixteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentysixteen-style' ), '20160412' );
	wp_style_add_data( 'twentysixteen-ie7', 'conditional', 'lt IE 8' );

	// Load the html5 shiv.
	wp_enqueue_script( 'twentysixteen-html5', get_template_directory_uri() . '/js/html5.js', array(), '3.7.3' );
	wp_script_add_data( 'twentysixteen-html5', 'conditional', 'lt IE 9' );

	wp_enqueue_script( 'twentysixteen-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20160412', true );

	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
		wp_enqueue_script( 'comment-reply' );
	}

	if ( is_singular() && wp_attachment_is_image() ) {
		wp_enqueue_script( 'twentysixteen-keyboard-image-navigation', get_template_directory_uri() . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20160412' );
	}

	wp_enqueue_script( 'twentysixteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20160412', true );

	wp_localize_script( 'twentysixteen-script', 'screenReaderText', array(
		'expand'   => __( 'expand child menu', 'twentysixteen' ),
		'collapse' => __( 'collapse child menu', 'twentysixteen' ),
	) );
}
add_action( 'wp_enqueue_scripts', 'twentysixteen_scripts' );

/**
 * Adds custom classes to the array of body classes.
 *
 * @since Twenty Sixteen 1.0
 *
 * @param array $classes Classes for the body element.
 * @return array (Maybe) filtered body classes.
 */
function twentysixteen_body_classes( $classes ) {
	// Adds a class of custom-background-image to sites with a custom background image.
	if ( get_background_image() ) {
		$classes[] = 'custom-background-image';
	}

	// Adds a class of group-blog to sites with more than 1 published author.
	if ( is_multi_author() ) {
		$classes[] = 'group-blog';
	}

	// Adds a class of no-sidebar to sites without active sidebar.
	if ( ! is_active_sidebar( 'sidebar-1' ) ) {
		$classes[] = 'no-sidebar';
	}

	// Adds a class of hfeed to non-singular pages.
	if ( ! is_singular() ) {
		$classes[] = 'hfeed';
	}

	return $classes;
}
add_filter( 'body_class', 'twentysixteen_body_classes' );

/**
 * Converts a HEX value to RGB.
 *
 * @since Twenty Sixteen 1.0
 *
 * @param string $color The original color, in 3- or 6-digit hexadecimal form.
 * @return array Array containing RGB (red, green, and blue) values for the given
 *               HEX code, empty array otherwise.
 */
function twentysixteen_hex2rgb( $color ) {
	$color = trim( $color, '#' );

	if ( strlen( $color ) === 3 ) {
		$r = hexdec( substr( $color, 0, 1 ).substr( $color, 0, 1 ) );
		$g = hexdec( substr( $color, 1, 1 ).substr( $color, 1, 1 ) );
		$b = hexdec( substr( $color, 2, 1 ).substr( $color, 2, 1 ) );
	} else if ( strlen( $color ) === 6 ) {
		$r = hexdec( substr( $color, 0, 2 ) );
		$g = hexdec( substr( $color, 2, 2 ) );
		$b = hexdec( substr( $color, 4, 2 ) );
	} else {
		return array();
	}

	return array( 'red' => $r, 'green' => $g, 'blue' => $b );
}

/**
 * Custom template tags for this theme.
 */
require get_template_directory() . '/inc/template-tags.php';

/**
 * Customizer additions.
 */
require get_template_directory() . '/inc/customizer.php';

/**
 * Add custom image sizes attribute to enhance responsive image functionality
 * for content images
 *
 * @since Twenty Sixteen 1.0
 *
 * @param string $sizes A source size value for use in a 'sizes' attribute.
 * @param array  $size  Image size. Accepts an array of width and height
 *                      values in pixels (in that order).
 * @return string A source size value for use in a content image 'sizes' attribute.
 */
function twentysixteen_content_image_sizes_attr( $sizes, $size ) {
	$width = $size[0];

	840 <= $width && $sizes = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px';

	if ( 'page' === get_post_type() ) {
		840 > $width && $sizes = '(max-width: ' . $width . 'px) 85vw, ' . $width . 'px';
	} else {
		840 > $width && 600 <= $width && $sizes = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px';
		600 > $width && $sizes = '(max-width: ' . $width . 'px) 85vw, ' . $width . 'px';
	}

	return $sizes;
}
add_filter( 'wp_calculate_image_sizes', 'twentysixteen_content_image_sizes_attr', 10 , 2 );

/**
 * Add custom image sizes attribute to enhance responsive image functionality
 * for post thumbnails
 *
 * @since Twenty Sixteen 1.0
 *
 * @param array $attr Attributes for the image markup.
 * @param int   $attachment Image attachment ID.
 * @param array $size Registered image size or flat array of height and width dimensions.
 * @return string A source size value for use in a post thumbnail 'sizes' attribute.
 */
function twentysixteen_post_thumbnail_sizes_attr( $attr, $attachment, $size ) {
	if ( 'post-thumbnail' === $size ) {
		is_active_sidebar( 'sidebar-1' ) && $attr['sizes'] = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 60vw, (max-width: 1362px) 62vw, 840px';
		! is_active_sidebar( 'sidebar-1' ) && $attr['sizes'] = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 88vw, 1200px';
	}
	return $attr;
}
add_filter( 'wp_get_attachment_image_attributes', 'twentysixteen_post_thumbnail_sizes_attr', 10 , 3 );

/**
 * Modifies tag cloud widget arguments to have all tags in the widget same font size.
 *
 * @since Twenty Sixteen 1.1
 *
 * @param array $args Arguments for tag cloud widget.
 * @return array A new modified arguments.
 */
function twentysixteen_widget_tag_cloud_args( $args ) {
	$args['largest'] = 1;
	$args['smallest'] = 1;
	$args['unit'] = 'em';
	return $args;
}
add_filter( 'widget_tag_cloud_args', 'twentysixteen_widget_tag_cloud_args' );

/* Codice per impostare come termina l'excerpt by Roberto Iacono di robertoiacono.it
function ri_new_excerpt_more($more) {
 global $post;
 return ' ...<a href="'. get_permalink($post->ID) . '"><br/><br/>READ MORE</a>';
}
add_filter('excerpt_more', 'ri_new_excerpt_more');*/


// Add span class to widget headlines
add_filter( 'widget_title', 'metro_widget_title' );
function metro_widget_title( $title ){
	if( $title )
	return sprintf('<span class="widget-headline">%s</span>', $title );
}

// enqueue font awesome
add_action( 'wp_enqueue_scripts', 'prefix_enqueue_awesome' );
function prefix_enqueue_awesome() {
wp_enqueue_style( 'prefix-font-awesome', '//netdna.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css', array(), '4.1.0' );
}
// funzione per aggiungere scripts al tema
 function add_theme_scripts() {
wp_enqueue_script('custom_script',get_template_directory_uri() . '/js/sticky.js', array('jquery'));
}
add_action( 'wp_enqueue_scripts', 'add_theme_scripts' );



register_sidebar( array(
'name' => 'Footer Sidebar 1',
'id' => 'footer-sidebar-1',
'description' => 'Questo widget apparirà nel footer 1',
'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );
register_sidebar( array(
'name' => 'Footer Sidebar 2',
'id' => 'footer-sidebar-2',
'description' => 'Questa widget apparirà nel footer 2',
'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );
register_sidebar( array(
'name' => 'Footer Sidebar 3',
'id' => 'footer-sidebar-3',
'description' => 'Questo widget apparirà nel footer 3',
'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );


function ri_php_text($text) {
if (strpos($text, '<' . '?') !== false) { ob_start(); eval('?' . '>' . $text);
$text = ob_get_contents();
ob_end_clean();
}
return $text;
}
add_filter('widget_text', 'ri_php_text', 99);


/* Codice per modificare la lunghezza dell'excerpt by Roberto Iacono di robertoiacono.it
function my_excerpt_length($length) {
    return 60;
}
add_filter('excerpt_length', 'my_excerpt_length');*/



//Formattazione nell' excerpt

function wpse_allowedtags() {
    // Add custom tags to this string
        return '<script>,<style>,<br>,<pre>,<em>,<i>,<ul>,<ol>,<li>,<a>,<p>,<img>,<video>,<audio>';
    }

if ( ! function_exists( 'wpse_custom_wp_trim_excerpt' ) ) :

    function wpse_custom_wp_trim_excerpt($wpse_excerpt) {
    global $post;
    $raw_excerpt = $wpse_excerpt;
        if ( '' == $wpse_excerpt ) {

            $wpse_excerpt = get_the_content('');
            $wpse_excerpt = strip_shortcodes( $wpse_excerpt );
            $wpse_excerpt = apply_filters('the_content', $wpse_excerpt);
            $wpse_excerpt = str_replace(']]>', ']]>', $wpse_excerpt);
            $wpse_excerpt = strip_tags($wpse_excerpt, wpse_allowedtags()); /*IF you need to allow just certain tags. Delete if all tags are allowed */

           //Set the excerpt word count and only break after sentence is complete.
                $excerpt_word_count = 300;
                $excerpt_length = apply_filters('excerpt_length', $excerpt_word_count);
                $tokens = array();
                $excerptOutput = '';
                $count = 0;

                // Divide the string into tokens; HTML tags, or words, followed by any whitespace
                preg_match_all('/(<[^>]+>|[^<>\s]+)\s*/u', $wpse_excerpt, $tokens);

                foreach ($tokens[0] as $token) {

    $excerptOutput .= $token;

    $excerptOutputWithoutTags = strip_tags(trim($excerptOutput));

    if (strlen($excerptOutputWithoutTags) >= $excerpt_word_count){
        break;
    }
}

             $wpse_excerpt = trim(force_balance_tags($excerptOutput));

                $excerpt_end = '... <br/><br/> <a style="font-family: Merriweather, Georgia, serif; font-size: 0.75rem; text-transform: uppercase;" href="'. esc_url( get_permalink() ) . '">' . '' . sprintf(__( 'Read more: %s ', 'wpse' ), get_the_title()) . '</a>';
                $excerpt_more = apply_filters('excerpt_more', ' ' . $excerpt_end);

                $pos = strrpos($wpse_excerpt, '</');
                if ($pos !== false)
                // Inside last HTML tag
                $wpse_excerpt = substr_replace($wpse_excerpt, $excerpt_end, $pos, 0); /* Add read more next to last word */
                //else
                // After the content
                //$wpse_excerpt .= $excerpt_end; /*Add read more in new paragraph */

            return $wpse_excerpt;

        }
        return apply_filters('wpse_custom_wp_trim_excerpt', $wpse_excerpt, $raw_excerpt);
    }

endif;

remove_filter('get_the_excerpt', 'wp_trim_excerpt');
add_filter('get_the_excerpt', 'wpse_custom_wp_trim_excerpt');



function insert_image_src_rel_in_head() {
    global $post;
    if ( !is_singular()) //se non si tratta di un post o di una pagina
        return;
    if(!has_post_thumbnail( $post->ID )) { //articolo privo di featured image, utilizza quindi la default scelta
        $default_image="http://VOSTROURL/IMMAGINEDEFAULT.jpg"; //Modifica URL e nome immagine con quelli del tuo blog
        echo '<meta property="og:image" content="' . $default_image . '"/>';
    } else {
        $thumbnail_src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'first-thumb' );
        echo '<meta property="og:image" content="' . esc_attr( $thumbnail_src[0] ) . '"/>';
    }
    echo "";
}
add_action( 'wp_head', 'insert_image_src_rel_in_head', 5 );