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<?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://developer.wordpress.org/themes/advanced-topics/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' ) ) :
/* function twentysixteen_setup() – Sets up theme defaults and registers support for various WordPress features. */
endif; // twentysixteen_setup
add_action( 'after_setup_theme', 'twentysixteen_setup' );

/* function twentysixteen_content_width() – Sets the content width in pixels, based on the theme’s design and stylesheet. */
add_action( 'after_setup_theme', 'twentysixteen_content_width', 0 );

/* function twentysixteen_resource_hints() – Add preconnect for Google Fonts. */
add_filter( 'wp_resource_hints', 'twentysixteen_resource_hints', 10, 2 );

/* function twentysixteen_widgets_init() – Registers a widget area. */
add_action( 'widgets_init', 'twentysixteen_widgets_init' );

if ( ! function_exists( 'twentysixteen_fonts_url' ) ) :
/* function twentysixteen_fonts_url() – Register Google fonts for Twenty Sixteen. */
endif;

/* function twentysixteen_javascript_detection() – Handles JavaScript detection. */
add_action( 'wp_head', 'twentysixteen_javascript_detection', 0 );

/* function twentysixteen_scripts() – Enqueues scripts and styles. */
add_action( 'wp_enqueue_scripts', 'twentysixteen_scripts' );

/* function twentysixteen_block_editor_styles() – Enqueue styles for the block-based editor. */
add_action( 'enqueue_block_editor_assets', 'twentysixteen_block_editor_styles' );

/* function twentysixteen_body_classes() – Adds custom classes to the array of body classes. */
add_filter( 'body_class', 'twentysixteen_body_classes' );

/* function twentysixteen_hex2rgb() – Converts a HEX value to RGB. */


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


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

/* function twentysixteen_content_image_sizes_attr() – Add custom image sizes attribute to enhance responsive image functionality
for content images */
add_filter( 'wp_calculate_image_sizes', 'twentysixteen_content_image_sizes_attr', 10, 2 );

/* function twentysixteen_post_thumbnail_sizes_attr() – Add custom image sizes attribute to enhance responsive image functionality
for post thumbnails */
add_filter( 'wp_get_attachment_image_attributes', 'twentysixteen_post_thumbnail_sizes_attr', 10, 3 );

/* function twentysixteen_widget_tag_cloud_args() – Modifies tag cloud widget arguments to display all tags in the same font size
and use list format for better accessibility. */
add_filter( 'widget_tag_cloud_args', 'twentysixteen_widget_tag_cloud_args' );
 

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