<?php
/**
 * SVG icons related functions and filters
 */

if ( ! function_exists( 'jetpack_social_menu_include_svg_icons' ) ) :
	/**
	 * Add SVG definitions to the footer.
	 */
	function jetpack_social_menu_include_svg_icons() {
		// Define SVG sprite file.
		$svg_icons = dirname( __FILE__ ) . '/social-menu.svg';

		// If it exists, include it.
		if ( file_exists( $svg_icons ) ) {
			require_once $svg_icons;
		}
	}
	add_action( 'wp_footer', 'jetpack_social_menu_include_svg_icons', 9999 );
endif;

if ( ! function_exists( 'jetpack_social_menu_get_svg' ) ) :
	/**
	 * Return SVG markup.
	 *
	 * @param array $args {
	 *     Parameters needed to display an SVG.
	 *
	 *     @type string $icon  Required SVG icon filename.
	 * }
	 * @return string SVG markup.
	 */
	function jetpack_social_menu_get_svg( $args = array() ) {
		// Make sure $args are an array.
		if ( empty( $args ) ) {
			return esc_html__( 'Please define default parameters in the form of an array.', 'jetpack' );
		}

		// Define an icon.
		if ( false === array_key_exists( 'icon', $args ) ) {
			return esc_html__( 'Please define an SVG icon filename.', 'jetpack' );
		}

		// Set defaults.
		$defaults = array(
			'icon'     => '',
			'fallback' => false,
		);

		// Parse args.
		$args = wp_parse_args( $args, $defaults );

		// Set aria hidden.
		$aria_hidden = ' aria-hidden="true"';

		// Begin SVG markup.
		$svg = '<svg class="icon icon-' . esc_attr( $args['icon'] ) . '"' . $aria_hidden . ' role="img">';

		/*
		 * Display the icon.
		 *
		 * The whitespace around `<use>` is intentional - it is a work around to a keyboard navigation bug in Safari 10.
		 *
		 * See https://core.trac.wordpress.org/ticket/38387.
		 */
		$svg .= ' <use href="#icon-' . esc_html( $args['icon'] ) . '" xlink:href="#icon-' . esc_html( $args['icon'] ) . '"></use> ';

		// Add some markup to use as a fallback for browsers that do not support SVGs.
		if ( $args['fallback'] ) {
			$svg .= '<span class="svg-fallback icon-' . esc_attr( $args['icon'] ) . '"></span>';
		}

		$svg .= '</svg>';

		return $svg;
	}
endif;

if ( ! function_exists( 'jetpack_social_menu_nav_menu_social_icons' ) ) :
	/**
	 * Display SVG icons in social links menu.
	 *
	 * @param  string  $item_output The menu item output.
	 * @param  WP_Post $item        Menu item object.
	 * @param  int     $depth       Depth of the menu.
	 * @param  array   $args        wp_nav_menu() arguments.
	 * @return string  $item_output The menu item output with social icon.
	 */
	function jetpack_social_menu_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
		// Get supported social icons.
		$social_icons = jetpack_social_menu_social_links_icons();

		// Change SVG icon inside social links menu if there is supported URL.
		if ( 'jetpack-social-menu' === $args->theme_location ) {
			foreach ( $social_icons as $attr => $value ) {
				if ( false !== strpos( $item_output, $attr ) ) {
					$item_output = str_replace( $args->link_after, '</span>' . jetpack_social_menu_get_svg( array( 'icon' => esc_attr( $value ) ) ), $item_output );
				}
			}
		}

		return $item_output;
	}
	add_filter( 'walker_nav_menu_start_el', 'jetpack_social_menu_nav_menu_social_icons', 10, 4 );
endif;

if ( ! function_exists( 'jetpack_social_menu_social_links_icons' ) ) :
	/**
	 * Returns an array of supported social links (URL and icon name).
	 *
	 * @return array $social_links_icons
	 */
	function jetpack_social_menu_social_links_icons() {
		// Supported social links icons.
		$social_links_icons = array(
			'500px.com'       => '500px',
			'amazon.cn'       => 'amazon',
			'amazon.in'       => 'amazon',
			'amazon.fr'       => 'amazon',
			'amazon.de'       => 'amazon',
			'amazon.it'       => 'amazon',
			'amazon.nl'       => 'amazon',
			'amazon.es'       => 'amazon',
			'amazon.co'       => 'amazon',
			'amazon.ca'       => 'amazon',
			'amazon.com'      => 'amazon',
			'apple.com'       => 'apple',
			'itunes.com'      => 'apple',
			'bandcamp.com'    => 'bandcamp',
			'behance.net'     => 'behance',
			'codepen.io'      => 'codepen',
			'deviantart.com'  => 'deviantart',
			'digg.com'        => 'digg',
			'dribbble.com'    => 'dribbble',
			'dropbox.com'     => 'dropbox',
			'etsy.com'        => 'etsy',
			'facebook.com'    => 'facebook',
			'/feed/'          => 'feed',
			'flickr.com'      => 'flickr',
			'foursquare.com'  => 'foursquare',
			'goodreads.com'   => 'goodreads',
			'plus.google.com' => 'google-plus',
			'google.com'      => 'google',
			'github.com'      => 'github',
			'instagram.com'   => 'instagram',
			'linkedin.com'    => 'linkedin',
			'mailto:'         => 'mail',
			'meetup.com'      => 'meetup',
			'medium.com'      => 'medium',
			'pinterest.com'   => 'pinterest',
			'getpocket.com'   => 'pocket',
			'reddit.com'      => 'reddit',
			'skype.com'       => 'skype',
			'skype:'          => 'skype',
			'slideshare.net'  => 'slideshare',
			'snapchat.com'    => 'snapchat',
			'soundcloud.com'  => 'soundcloud',
			'spotify.com'     => 'spotify',
			'stumbleupon.com' => 'stumbleupon',
			'tumblr.com'      => 'tumblr',
			'twitch.tv'       => 'twitch',
			'twitter.com'     => 'twitter',
			'vimeo.com'       => 'vimeo',
			'vk.com'          => 'vk',
			'wordpress.org'   => 'wordpress',
			'wordpress.com'   => 'wordpress',
			'yelp.com'        => 'yelp',
			'youtube.com'     => 'youtube',
		);

		return $social_links_icons;
	}
endif;
