<?php
/**
 * Media template functions. These functions are meant to handle various features needed in theme templates 
 * for media and attachments.
 *
 * @package    HybridCore
 * @subpackage Functions
 * @author     Justin Tadlock <justin@justintadlock.com>
 * @copyright  Copyright (c) 2008 - 2014, Justin Tadlock
 * @link       http://themehybrid.com/hybrid-core
 * @license    http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

/**
 * Checks if the current post has a mime type of 'audio'.
 *
 * @since  1.6.0
 * @access public
 * @param  int    $post_id
 * @return bool
 */
function hybrid_attachment_is_audio( $post_id = 0 ) {

	$post_id   = empty( $post_id ) ? get_the_ID() : $post_id;
	$mime_type = get_post_mime_type( $post_id );

	list( $type, $subtype ) = false !== strpos( $mime_type, '/' ) ? explode( '/', $mime_type ) : array( $mime_type, '' );

	return 'audio' === $type ? true : false;
}

/**
 * Checks if the current post has a mime type of 'video'.
 *
 * @since  1.6.0
 * @access public
 * @param  int    $post_id
 * @return bool
 */
function hybrid_attachment_is_video( $post_id = 0 ) {

	$post_id   = empty( $post_id ) ? get_the_ID() : $post_id;
	$mime_type = get_post_mime_type( $post_id );

	list( $type, $subtype ) = false !== strpos( $mime_type, '/' ) ? explode( '/', $mime_type ) : array( $mime_type, '' );

	return 'video' === $type ? true : false;
}

/**
 * Retrieves an attachment ID based on an attachment file URL.
 *
 * @copyright Pippin Williamson
 * @license   http://www.gnu.org/licenses/gpl-2.0.html
 * @link      http://pippinsplugins.com/retrieve-attachment-id-from-image-url/
 *
 * @since  2.0.0
 * @access public
 * @param  string  $url
 * @return int
 */
function hybrid_get_attachment_id_from_url( $url ) {
	global $wpdb;

	$prefix = $wpdb->prefix;

	$posts = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM " . $prefix . "posts" . " WHERE guid='%s';", $url ) ); 
 
	return array_shift( $posts );
}

/**
 * Returns a set of image attachment links based on size.
 *
 * @since  2.0.0
 * @access public
 * @return string
 */
function hybrid_get_image_size_links() {

	/* If not viewing an image attachment page, return. */
	if ( !wp_attachment_is_image( get_the_ID() ) )
		return;

	/* Set up an empty array for the links. */
	$links = array();

	/* Get the intermediate image sizes and add the full size to the array. */
	$sizes   = get_intermediate_image_sizes();
	$sizes[] = 'full';

	/* Loop through each of the image sizes. */
	foreach ( $sizes as $size ) {

		/* Get the image source, width, height, and whether it's intermediate. */
		$image = wp_get_attachment_image_src( get_the_ID(), $size );

		/* Add the link to the array if there's an image and if $is_intermediate (4th array value) is true or full size. */
		if ( !empty( $image ) && ( true === $image[3] || 'full' == $size ) ) {

			/* Translators: Media dimensions - 1 is width and 2 is height. */
			$label = sprintf( __( '%1$s &#215; %2$s', 'hybrid-core' ), number_format_i18n( absint( $image[1] ) ), number_format_i18n( absint( $image[2] ) ) );

			$links[] = sprintf( '<a class="image-size-link">%s</a>', $label );
		}
	}

	/* Join the links in a string and return. */
	return join( ' <span class="sep">/</span> ', $links );
}

/**
 * Gets the "transcript" for an audio attachment.  This is typically saved as "unsynchronised_lyric", which is 
 * the ID3 tag sanitized by WordPress.
 *
 * @since  2.0.0
 * @access public
 * @param  int     $post_id
 * @return string
 */
function hybrid_get_audio_transcript( $post_id = 0 ) {

	if ( empty( $post_id ) )
		$post_id = get_the_ID();

	/* Set up some default variables and get the image metadata. */
	$lyrics = '';
	$meta   = wp_get_attachment_metadata( $post_id );

	/* Look for the 'unsynchronised_lyric' tag. */
	if ( isset( $meta['unsynchronised_lyric'] ) )
		$lyrics = $meta['unsynchronised_lyric'];

	/* Seen this misspelling of the id3 tag. */
	elseif ( isset( $meta['unsychronised_lyric'] ) )
		$lyrics = $meta['unsychronised_lyric'];

	/* Apply filters for the transcript. */
	return apply_filters( 'hybrid_audio_transcript', $lyrics );
}

/**
 * Loads the correct function for handling attachments.  Checks the attachment mime type to call 
 * correct function. Image attachments are not loaded with this function.  The functionality for them 
 * should be handled by the theme's attachment or image attachment file.
 *
 * Ideally, all attachments would be appropriately handled within their templates. However, this could 
 * lead to messy template files.
 *
 * @since  0.5.0
 * @access public
 * @return void
 */
function hybrid_attachment() {

	$file       = wp_get_attachment_url();
	$mime       = get_post_mime_type();
	$attachment = '';

	$mime_type = false !== strpos( $mime, '/' ) ? explode( '/', $mime ) : array( $mime, '' );

	/* Loop through each mime type. If a function exists for it, call it. Allow users to filter the display. */
	foreach ( $mime_type as $type ) {
		if ( function_exists( "hybrid_{$type}_attachment" ) )
			$attachment = call_user_func( "hybrid_{$type}_attachment", $mime, $file );

		$attachment = apply_filters( "hybrid_{$type}_attachment", $attachment );
	}

	echo apply_filters( 'hybrid_attachment', $attachment );
}

/**
 * Handles application attachments on their attachment pages.  Uses the <object> tag to embed media 
 * on those pages.
 *
 * @since  0.3.0
 * @access public
 * @param  string $mime attachment mime type
 * @param  string $file attachment file URL
 * @return string
 */
function hybrid_application_attachment( $mime = '', $file = '' ) {
	$embed_defaults = wp_embed_defaults();
	$application = '<object class="text" type="' . esc_attr( $mime ) . '" data="' . esc_url( $file ) . '" width="' . esc_attr( $embed_defaults['width'] ) . '" height="' . esc_attr( $embed_defaults['height'] ) . '">';
	$application .= '<param name="src" value="' . esc_url( $file ) . '" />';
	$application .= '</object>';

	return $application;
}

/**
 * Handles text attachments on their attachment pages.  Uses the <object> element to embed media 
 * in the pages.
 *
 * @since  0.3.0
 * @access public
 * @param  string $mime attachment mime type
 * @param  string $file attachment file URL
 * @return string
 */
function hybrid_text_attachment( $mime = '', $file = '' ) {
	$embed_defaults = wp_embed_defaults();
	$text = '<object class="text" type="' . esc_attr( $mime ) . '" data="' . esc_url( $file ) . '" width="' . esc_attr( $embed_defaults['width'] ) . '" height="' . esc_attr( $embed_defaults['height'] ) . '">';
	$text .= '<param name="src" value="' . esc_url( $file ) . '" />';
	$text .= '</object>';

	return $text;
}

/**
 * Handles the output of the media for audio attachment posts. This should be used within The Loop.
 *
 * @since  0.2.2
 * @access public
 * @return string
 */
function hybrid_audio_attachment() {
	return hybrid_media_grabber( array( 'type' => 'audio' ) );
}

/**
 * Handles the output of the media for video attachment posts. This should be used within The Loop.
 *
 * @since  0.2.2
 * @access public
 * @return string
 */
function hybrid_video_attachment() {
	return hybrid_media_grabber( array( 'type' => 'video' ) );
}
