<?php

su_add_shortcode( array(
		'id' => 'meta',
		'callback' => 'su_shortcode_meta',
		'image' => su_get_plugin_url() . 'admin/images/shortcodes/meta.svg',
		'name' => __( 'Meta data', 'shortcodes-ultimate' ),
		'type' => 'single',
		'group' => 'data',
		'atts' => array(
			'key' => array(
				'default' => '',
				'name' => __( 'Key', 'shortcodes-ultimate' ),
				'desc' => __( 'Meta key name', 'shortcodes-ultimate' )
			),
			'default' => array(
				'default' => '',
				'name' => __( 'Default', 'shortcodes-ultimate' ),
				'desc' => __( 'This text will be shown if data is not found', 'shortcodes-ultimate' )
			),
			'before' => array(
				'default' => '',
				'name' => __( 'Before', 'shortcodes-ultimate' ),
				'desc' => __( 'This content will be shown before the value', 'shortcodes-ultimate' )
			),
			'after' => array(
				'default' => '',
				'name' => __( 'After', 'shortcodes-ultimate' ),
				'desc' => __( 'This content will be shown after the value', 'shortcodes-ultimate' )
			),
			'post_id' => array(
				'default' => '',
				'name' => __( 'Post ID', 'shortcodes-ultimate' ),
				'desc' => __( 'You can specify custom post ID. Leave this field empty to use an ID of the current post. Current post ID may not work in Live Preview mode', 'shortcodes-ultimate' )
			),
			'filter' => array(
				'default' => '',
				'name' => __( 'Filter', 'shortcodes-ultimate' ),
				'desc' => __( 'You can apply custom filter to the retrieved value. Enter here function name. Your function must accept one argument and return modified value. Name of your function must include word <b>filter</b>. Example function: ', 'shortcodes-ultimate' ) . "<br /><pre><code style='display:block;padding:5px'>function my_custom_filter( \$value ) {\n\treturn 'Value is: ' . \$value;\n}</code></pre>"
			)
		),
		'desc' => __( 'Post meta', 'shortcodes-ultimate' ),
		'icon' => 'info-circle',
	) );

function su_shortcode_meta( $atts = null, $content = null ) {
	$atts = shortcode_atts( array(
			'key'     => '',
			'default' => '',
			'before'  => '',
			'after'   => '',
			'post_id' => '',
			'filter'  => ''
		), $atts, 'meta' );
	// Define current post ID
	if ( !$atts['post_id'] ) $atts['post_id'] = get_the_ID();
	// Check post ID
	if ( !is_numeric( $atts['post_id'] ) || $atts['post_id'] < 1 ) return sprintf( '<p class="su-error">Meta: %s</p>', __( 'post ID is incorrect', 'shortcodes-ultimate' ) );
	// Check key name
	if ( !$atts['key'] ) return sprintf( '<p class="su-error">Meta: %s</p>', __( 'please specify meta key name', 'shortcodes-ultimate' ) );
	// Get the meta
	$meta = get_post_meta( $atts['post_id'], $atts['key'], true );
	// Set default value if meta is empty
	if ( !$meta ) $meta = $atts['default'];
	// Apply cutom filter
	if (
		$atts['filter'] &&
		su_is_filter_safe( $atts['filter'] ) &&
		function_exists( $atts['filter'] )
	) {
		$meta = call_user_func( $atts['filter'], $meta );
	}
	// Return result
	return ( $meta ) ? $atts['before'] . $meta . $atts['after'] : '';
}