<?php
/**
 * Twenty Thirteen functions and definitions.
 *
 * Sets 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 (see http://codex.wordpress.org/Theme_Development
 * and http://codex.wordpress.org/Child_Themes), 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.
 *
 * 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,
 * see http://codex.wordpress.org/Plugin_API
 *
 * @package WordPress
 * @subpackage Twenty_Thirteen
 * @since Twenty Thirteen 1.0
 */

/**
 * Sets up the content width value based on the theme's design.
 * @see twentythirteen_content_width() for template-specific adjustments.
 */
if ( ! isset( $content_width ) )
	$content_width = 604;

/**
 * Adds support for a custom header image.
 */
require( get_template_directory() . '/inc/custom-header.php' );

/**
 * Twenty Thirteen only works in WordPress 3.6 or later.
 */
if ( version_compare( $GLOBALS['wp_version'], '3.6-alpha', '<' ) )
	require( get_template_directory() . '/inc/back-compat.php' );

/**
 * Sets up theme defaults and registers the various WordPress features that
 * Twenty Thirteen supports.
 *
 * @uses load_theme_textdomain() For translation/localization support.
 * @uses add_editor_style() To add a Visual Editor stylesheet.
 * @uses add_theme_support() To add support for automatic feed links, post
 * formats, and post thumbnails.
 * @uses register_nav_menu() To add support for a navigation menu.
 * @uses set_post_thumbnail_size() To set a custom post thumbnail size.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_setup() {
	/*
	 * Makes Twenty Thirteen available for translation.
	 *
	 * Translations can be added to the /languages/ directory.
	 * If you're building a theme based on Twenty Thirteen, use a find and
	 * replace to change 'twentythirteen' to the name of your theme in all
	 * template files.
	 */
	load_theme_textdomain( 'twentythirteen', get_template_directory() . '/languages' );

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

	// Adds RSS feed links to <head> for posts and comments.
	add_theme_support( 'automatic-feed-links' );

	/*
	 * This theme supports all available post formats.
	 * See http://codex.wordpress.org/Post_Formats
	 *
	 * Structured post formats are formats where Twenty Thirteen handles the
	 * output instead of the default core HTML output.
	 */
	add_theme_support( 'structured-post-formats', array(
		'link', 'video'
	) );
	add_theme_support( 'post-formats', array(
		'aside', 'audio', 'chat', 'gallery', 'image', 'quote', 'status'
	) );

	// This theme uses wp_nav_menu() in one location.
	register_nav_menu( 'primary', __( 'Navigation Menu', 'twentythirteen' ) );

	/*
	 * This theme uses a custom image size for featured images, displayed on
	 * "standard" posts and pages.
	 */
	add_theme_support( 'post-thumbnails' );
	set_post_thumbnail_size( 604, 270, true );

	// Register custom image size for image post formats.
	add_image_size( 'twentythirteen-image-post', 724, 1288 );

	// This theme uses its own gallery styles.
	add_filter( 'use_default_gallery_style', '__return_false' );
}
add_action( 'after_setup_theme', 'twentythirteen_setup' );

/**
 * Returns the Google font stylesheet URL, if available.
 *
 * The use of Source Sans Pro and Bitter by default is localized. For languages
 * that use characters not supported by the font, the font can be disabled.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return string Font stylesheet or empty string if disabled.
 */
function twentythirteen_fonts_url() {
	$fonts_url = '';

	/* Translators: If there are characters in your language that are not
	 * supported by Source Sans Pro, translate this to 'off'. Do not translate
	 * into your own language.
	 */
	$source_sans_pro = _x( 'on', 'Source Sans Pro font: on or off', 'twentythirteen' );

	/* Translators: If there are characters in your language that are not
	 * supported by Bitter, translate this to 'off'. Do not translate into your
	 * own language.
	 */
	$bitter = _x( 'on', 'Bitter font: on or off', 'twentythirteen' );

	if ( 'off' !== $source_sans_pro || 'off' !== $bitter ) {
		$font_families = array();

		if ( 'off' !== $source_sans_pro )
			$font_families[] = 'Source+Sans+Pro:400,700,300italic,400italic,700italic';

		if ( 'off' !== $bitter )
			$font_families[] = 'Bitter:400,700';

		$protocol = is_ssl() ? 'https' : 'http';
		$query_args = array(
			'family' => implode( '|', $font_families ),
			'subset' => 'latin,latin-ext',
		);
		$fonts_url = add_query_arg( $query_args, "$protocol://fonts.googleapis.com/css" );
	}

	return $fonts_url;
}

/**
 * Loads our special font CSS file.
 *
 * To disable in a child theme, use wp_dequeue_style()
 * function mytheme_dequeue_fonts() {
 *     wp_dequeue_style( 'twentythirteen-fonts' );
 * }
 * add_action( 'wp_enqueue_scripts', 'mytheme_dequeue_fonts', 11 );
 *
 * Also used in the Appearance > Header admin panel:
 * @see twentythirteen_custom_header_setup()
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_fonts() {
	$fonts_url = twentythirteen_fonts_url();
	if ( ! empty( $fonts_url ) )
		wp_enqueue_style( 'twentythirteen-fonts', esc_url_raw( $fonts_url ), array(), null );
}
add_action( 'wp_enqueue_scripts', 'twentythirteen_fonts' );

/**
 * Adds additional stylesheets to the TinyMCE editor if needed.
 *
 * @uses twentythirteen_fonts_url() to get the Google Font stylesheet URL.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param string $mce_css CSS path to load in TinyMCE.
 * @return string
 */
function twentythirteen_mce_css( $mce_css ) {
	$fonts_url = twentythirteen_fonts_url();

	if ( empty( $fonts_url ) )
		return $mce_css;

	if ( ! empty( $mce_css ) )
		$mce_css .= ',';

	$mce_css .= esc_url_raw( str_replace( ',', '%2C', $fonts_url ) );

	return $mce_css;
}
add_filter( 'mce_css', 'twentythirteen_mce_css' );

/**
 * Enqueues scripts and styles for front end.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_scripts_styles() {
	global $wp_styles;

	/*
	 * Adds JavaScript to pages with the comment form to support sites with
	 * threaded comments (when in use).
	 */
	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) )
		wp_enqueue_script( 'comment-reply' );

	// Adds Masonry to handle vertical alignment of footer widgets.
	if ( is_active_sidebar( 'sidebar-1' ) )
		wp_enqueue_script( 'jquery-masonry' );

	// Loads JavaScript file with functionality specific to Twenty Thirteen.
	wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20130423', true );

	// Loads our main stylesheet.
	wp_enqueue_style( 'twentythirteen-style', get_stylesheet_uri() );

	// Loads the Internet Explorer specific stylesheet.
	wp_enqueue_style( 'twentythirteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentythirteen-style' ), '20130213' );
	$wp_styles->add_data( 'twentythirteen-ie', 'conditional', 'lt IE 9' );
}
add_action( 'wp_enqueue_scripts', 'twentythirteen_scripts_styles' );

/**
 * Creates a nicely formatted and more specific title element text for output
 * in head of document, based on current view.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param string $title Default title text for current view.
 * @param string $sep Optional separator.
 * @return string Filtered title.
 */
function twentythirteen_wp_title( $title, $sep ) {
	global $paged, $page;

	if ( is_feed() )
		return $title;

	// Add the site name.
	$title .= get_bloginfo( 'name' );

	// Add the site description for the home/front page.
	$site_description = get_bloginfo( 'description', 'display' );
	if ( $site_description && ( is_home() || is_front_page() ) )
		$title = "$title $sep $site_description";

	// Add a page number if necessary.
	if ( $paged >= 2 || $page >= 2 )
		$title = "$title $sep " . sprintf( __( 'Page %s', 'twentythirteen' ), max( $paged, $page ) );

	return $title;
}
add_filter( 'wp_title', 'twentythirteen_wp_title', 10, 2 );

/**
 * Registers two widget areas.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_widgets_init() {
	register_sidebar( array(
		'name'          => __( 'Main Widget Area', 'twentythirteen' ),
		'id'            => 'sidebar-1',
		'description'   => __( 'Appears in the footer section of the site', 'twentythirteen' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget'  => '</aside>',
		'before_title'  => '<h3 class="widget-title">',
		'after_title'   => '</h3>',
	) );

	register_sidebar( array(
		'name'          => __( 'Secondary Widget Area', 'twentythirteen' ),
		'id'            => 'sidebar-2',
		'description'   => __( 'Appears on posts and pages in the sidebar.', 'twentythirteen' ),
		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
		'after_widget'  => '</aside>',
		'before_title'  => '<h3 class="widget-title">',
		'after_title'   => '</h3>',
	) );
}
add_action( 'widgets_init', 'twentythirteen_widgets_init' );

if ( ! function_exists( 'twentythirteen_paging_nav' ) ) :
/**
 * Displays navigation to next/previous set of posts when applicable.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_paging_nav() {
	global $wp_query;

	// Don't print empty markup if there's only one page.
	if ( $wp_query->max_num_pages < 2 && ( is_home() || is_archive() || is_search() ) )
		return;
	?>
	<nav class="navigation paging-navigation" role="navigation">
		<h1 class="screen-reader-text"><?php _e( 'Posts navigation', 'twentythirteen' ); ?></h1>
		<div class="nav-links">

			<?php if ( get_next_posts_link() ) : ?>
			<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'twentythirteen' ) ); ?></div>
			<?php endif; ?>

			<?php if ( get_previous_posts_link() ) : ?>
			<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'twentythirteen' ) ); ?></div>
			<?php endif; ?>

		</div><!-- .nav-links -->
	</nav><!-- .navigation -->
	<?php
}
endif;

if ( ! function_exists( 'twentythirteen_post_nav' ) ) :
/**
 * Displays navigation to next/previous post when applicable.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_post_nav() {
	global $post;

	// Don't print empty markup if there's nowhere to navigate.
	$previous = ( is_attachment() ) ? get_post( $post->post_parent ) : get_adjacent_post( false, '', true );
	$next = get_adjacent_post( false, '', false );

	if ( ! $next && ! $previous )
		return;
	?>
	<nav class="navigation post-navigation" role="navigation">
		<h1 class="screen-reader-text"><?php _e( 'Post navigation', 'twentythirteen' ); ?></h1>
		<div class="nav-links">

			<?php previous_post_link( '%link', _x( '<span class="meta-nav">&larr;</span> %title', 'Previous post link', 'twentythirteen' ) ); ?>
			<?php next_post_link( '%link', _x( '%title <span class="meta-nav">&rarr;</span>', 'Next post link', 'twentythirteen' ) ); ?>

		</div><!-- .nav-links -->
	</nav><!-- .navigation -->
	<?php
}
endif;

if ( ! function_exists( 'twentythirteen_entry_meta' ) ) :
/**
 * Prints HTML with meta information for current post: categories, tags, permalink, author, and date.
 *
 * Create your own twentythirteen_entry_meta() to override in a child theme.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_entry_meta() {
	if ( is_sticky() && is_home() && ! is_paged() )
		echo '<span class="featured-post">' . __( 'Sticky', 'twentythirteen' ) . '</span>';

	if ( ! has_post_format( 'link' ) && 'post' == get_post_type() )
		twentythirteen_entry_date();

	// Translators: used between list items, there is a space after the comma.
	$categories_list = get_the_category_list( __( ', ', 'twentythirteen' ) );
	if ( $categories_list ) {
		echo '<span class="categories-links">' . $categories_list . '</span>';
	}

	// Translators: used between list items, there is a space after the comma.
	$tag_list = get_the_tag_list( '', __( ', ', 'twentythirteen' ) );
	if ( $tag_list ) {
		echo '<span class="tags-links">' . $tag_list . '</span>';
	}

	// Post author
	if ( 'post' == get_post_type() ) {
		printf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s" rel="author">%3$s</a></span>',
			esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
			esc_attr( sprintf( __( 'View all posts by %s', 'twentythirteen' ), get_the_author() ) ),
			get_the_author()
		);
	}
}
endif;

if ( ! function_exists( 'twentythirteen_entry_date' ) ) :
/**
 * Prints HTML with date information for current post.
 *
 * Create your own twentythirteen_entry_date() to override in a child theme.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param boolean $echo Whether to echo the date. Default true.
 * @return string
 */
function twentythirteen_entry_date( $echo = true ) {
	$format_prefix = ( has_post_format( 'chat' ) || has_post_format( 'status' ) ) ? _x( '%1$s on %2$s', '1: post format name. 2: date', 'twentythirteen' ): '%2$s';

	$date = sprintf( '<span class="date"><a href="%1$s" title="%2$s" rel="bookmark"><time class="entry-date" datetime="%3$s">%4$s</time></a></span>',
		esc_url( get_permalink() ),
		esc_attr( sprintf( __( 'Permalink to %s', 'twentythirteen' ), the_title_attribute( 'echo=0' ) ) ),
		esc_attr( get_the_date( 'c' ) ),
		esc_html( sprintf( $format_prefix, get_post_format_string( get_post_format() ), get_the_date() ) )
	);

	if ( $echo )
		echo $date;

	return $date;
}
endif;

/**
 * Returns the URL from the post.
 *
 * @uses get_the_link() to get the URL in the post meta (if it exists) or
 * the first link found in the post content.
 *
 * Falls back to the post permalink if no URL is found in the post.
 *
 * @since Twenty Thirteen 1.0
 * @return string URL
 */
function twentythirteen_get_link_url() {
	$has_url = get_the_post_format_url();

	return ( $has_url ) ? $has_url : apply_filters( 'the_permalink', get_permalink() );
}

/**
 * Sets the image size in featured galleries to large.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param array $atts Combined and filtered attribute list.
 * @return array
 */
function twentythirteen_gallery_atts( $atts ) {
	if ( has_post_format( 'gallery' ) && ! is_single() )
		$atts['size'] = 'large';

	return $atts;
}
add_filter( 'shortcode_atts_gallery', 'twentythirteen_gallery_atts' );

/**
 * Extends the default WordPress body class to denote:
 * 1. Custom fonts enabled.
 * 2. Single or multiple authors.
 * 3. Active widgets in the sidebar to change the layout and spacing.
 * 4. When avatars are disabled in discussion settings.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param array $classes Existing class values.
 * @return array Filtered class values.
 */
function twentythirteen_body_class( $classes ) {

	// Enable custom font class only if the font CSS is queued to load.
	if ( wp_style_is( 'twentythirteen-fonts', 'enqueued' ) )
		$classes[] = 'custom-font';

	if ( ! is_multi_author() )
		$classes[] = 'single-author';

	if ( is_active_sidebar( 'sidebar-2' ) && ! is_attachment() && ! is_404() )
		$classes[] = 'sidebar';

	if ( ! get_option( 'show_avatars' ) )
		$classes[] = 'no-avatars';

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

/**
 * Adjusts content_width value for video post formats and attachment templates.
 *
 * @since Twenty Thirteen 1.0
 *
 * @return void
 */
function twentythirteen_content_width() {
	if ( has_post_format( 'video' ) || is_attachment() ) {
		global $content_width;
		$content_width = 724;
	}
}
add_action( 'template_redirect', 'twentythirteen_content_width' );

/**
 * Adjusts content_width value for video shortcodes in video post formats.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param array $atts Attribute list.
 * @return array Filtered attribute list.
 */
function twentythirteen_video_width( $atts ) {
	if ( ! is_admin() && has_post_format( 'video' ) ) {
		$new_width = 724;
		$atts['height'] = round( ( $atts['height'] * $new_width ) / $atts['width'] );
		$atts['width'] = $new_width;
	}

	return $atts;
}
add_action( 'embed_defaults',       'twentythirteen_video_width' );
add_action( 'shortcode_atts_video', 'twentythirteen_video_width' );

/**
 * Switches default core markup for search form to output valid HTML5.
 *
 * @param string $format Expected markup format, default is `xhtml`
 * @return string Twenty Thirteen loves HTML5.
 */
function twentythirteen_search_form_format( $format ) {
	return 'html5';
}
add_filter( 'search_form_format', 'twentythirteen_search_form_format' );

/**
 * Add postMessage support for site title and description for the Customizer.
 *
 * @since Twenty Thirteen 1.0
 *
 * @param WP_Customize_Manager $wp_customize Customizer object.
 * @return void
 */
function twentythirteen_customize_register( $wp_customize ) {
	$wp_customize->get_setting( 'blogname' )->transport         = 'postMessage';
	$wp_customize->get_setting( 'blogdescription' )->transport  = 'postMessage';
	$wp_customize->get_setting( 'header_textcolor' )->transport = 'postMessage';
}
add_action( 'customize_register', 'twentythirteen_customize_register' );

/**
 * Binds JavaScript handlers to make Customizer preview reload changes
 * asynchronously.
 *
 * @since Twenty Thirteen 1.0
 */
function twentythirteen_customize_preview_js() {
	wp_enqueue_script( 'twentythirteen-customizer', get_template_directory_uri() . '/js/theme-customizer.js', array( 'customize-preview' ), '20130226', true );
}
add_action( 'customize_preview_init', 'twentythirteen_customize_preview_js' );
