<?php
/**
 * Sample implementation of the Custom Header feature
 * http://codex.wordpress.org/Custom_Headers
 *
 * @package Publish
 * @since Publish 1.0
 */

/**
 * Setup the WordPress core custom header feature.
 *
 * Use add_theme_support to register support for WordPress 3.4+
 * as well as provide backward compatibility for previous versions.
 * Use feature detection of wp_get_theme() which was introduced
 * in WordPress 3.4.
 *
 * @todo Rework this function to remove WordPress 3.4 support when WordPress 3.6 is released.
 *
 * @uses publish_header_style()
 * @uses publish_admin_header_style()
 * @uses publish_admin_header_image()
 *
 * @package Publish
 */
function publish_custom_header_setup() {
	add_theme_support( 'custom-header', apply_filters( 'publish_custom_header_args', array(
		'default-image' => publish_get_default_header_image(),
		'width'         => 100,
		'height'        => 100,
		'flex-width'    => true,
		'flex-height'   => true,
		'header-text'   => false,
	) ) );
}
add_action( 'after_setup_theme', 'publish_custom_header_setup' );

/**
 * A default header image
 *
 * Use the admin email's gravatar as the default header image.
 *
 * @since Publish 1.2.3
 */
function publish_get_default_header_image() {

	// Get default from Discussion Settings.
	$default = get_option( 'avatar_default', 'mystery' ); // Mystery man default
	if ( 'mystery' == $default )
		$default = 'mm';
	elseif ( 'gravatar_default' == $default )
		$default = '';

	$url = ( is_ssl() ) ? 'https://secure.gravatar.com' : 'http://gravatar.com';
	$url .= sprintf( '/avatar/%s/', md5( get_option( 'admin_email' ) ) );
	$url = add_query_arg( array(
		's' => 100,
		'd' => urlencode( $default ),
	), $url );

	return esc_url_raw( $url );
} // publish_get_default_header_image