<?php
/**
 * Meta Boxes support for custom post types
 *
 * @package ThemeREX Addons
 * @since v1.1
 */

// Don't load directly
if ( ! defined( 'TRX_ADDONS_VERSION' ) ) {
	exit;
}


// Return true if current screen need to load options scripts and styles
if ( !function_exists( 'trx_addons_meta_box_need_options' ) ) {
	add_filter('trx_addons_filter_need_options', 'trx_addons_meta_box_need_options');
	function trx_addons_meta_box_need_options($need = false) {
		if (!$need) {
			// If current screen is 'Edit Page' with one of ThemeREX Addons custom post types
			$screen = function_exists('get_current_screen') ? get_current_screen() : false;
			$need = is_object($screen) && $screen->id==$screen->post_type && trx_addons_meta_box_is_registered($screen->post_type);
		}
		return $need;
	}
}

// Register meta box fields array for the specified post type
if (!function_exists('trx_addons_meta_box_register')) {
	function trx_addons_meta_box_register($post_type, $meta_box) {
		if ( ! empty($post_type) ) {
			global $TRX_ADDONS_STORAGE;
			if ( ! in_array( $post_type, $TRX_ADDONS_STORAGE['post_types'] ) ) {
				$TRX_ADDONS_STORAGE['post_types'][] = $post_type;
			}
			if ( ! isset( $TRX_ADDONS_STORAGE["meta_box_{$post_type}"] ) ) {
				$TRX_ADDONS_STORAGE["meta_box_{$post_type}"] = array();
			}
			if ( trx_addons_meta_box_check_sections($meta_box) && ! trx_addons_meta_box_check_sections($TRX_ADDONS_STORAGE["meta_box_{$post_type}"]) ) {
				$TRX_ADDONS_STORAGE["meta_box_{$post_type}"] = array_merge(
																	array(
																		$post_type . "_section" => array(
																			"title" => esc_html__("General", 'trx_addons'),
																			"desc" => wp_kses_data( __('General parameters for this post', 'trx_addons') ),
																			"type" => "section"
																		)
																	),
																	$TRX_ADDONS_STORAGE["meta_box_{$post_type}"]
																);
			}
			$TRX_ADDONS_STORAGE["meta_box_{$post_type}"] = apply_filters(
																'trx_addons_filter_meta_box_fields',
																array_merge(
																	$TRX_ADDONS_STORAGE["meta_box_{$post_type}"],
																	$meta_box
																),
																$post_type
															);
		}
	}
}

// Check if meta box contain at least one section
if (!function_exists('trx_addons_meta_box_check_sections')) {
	function trx_addons_meta_box_check_sections($meta_box) {
		$rez = false;
		if (is_array($meta_box)) {
			foreach($meta_box as $v) {
				if ($v['type'] == 'section') {
					$rez = true;
					break;
				}
			}
		}
		return $rez;
	}
}

// Check if meta box for the specified post type is registered
if (!function_exists('trx_addons_meta_box_is_registered')) {
	function trx_addons_meta_box_is_registered($post_type) {
		global $TRX_ADDONS_STORAGE;
		return !empty($TRX_ADDONS_STORAGE['post_types']) && in_array($post_type, $TRX_ADDONS_STORAGE['post_types']);
	}
}

// Return meta box fields array for the specified post type
if (!function_exists('trx_addons_meta_box_get')) {
	function trx_addons_meta_box_get($post_type) {
		global $TRX_ADDONS_STORAGE;
		return isset($TRX_ADDONS_STORAGE["meta_box_{$post_type}"]) ? $TRX_ADDONS_STORAGE["meta_box_{$post_type}"] : array();
	}
}

// Add meta box
if (!function_exists('trx_addons_meta_box_add')) {
	add_action('add_meta_boxes', 'trx_addons_meta_box_add');
	function trx_addons_meta_box_add() {
		global $post_type;
		if ( trx_addons_meta_box_is_registered($post_type) ) {
			add_meta_box(
				'trx_addons_meta_box', 
				esc_html__('Item Options', 'trx_addons'),
				'trx_addons_meta_box_show', 
				$post_type, 
				apply_filters('trx_addons_filter_add_meta_box_context', 'advanced', $post_type), 
				apply_filters('trx_addons_filter_add_meta_box_priority', 'default', $post_type)
			);
		}
		// Custom theme-specific meta-boxes
		$boxes = apply_filters('trx_addons_filter_override_options', array());
		if (is_array($boxes)) {
			foreach ($boxes as $box) {
				$box = trx_addons_array_merge(array('',			// id
													'',			// title
													'',			// callback
													null,		// screen
													'advanced',	// context
													'default',	// priority
													null		// callbacks
													),
												$box);
				add_meta_box($box[0], $box[1], $box[2], $box[3], $box[4], $box[5], $box[6]);
			}
		}
	}
}

// Callback function to show fields in meta box
if (!function_exists('trx_addons_meta_box_show')) {
	function trx_addons_meta_box_show() {
		global $post, $post_type;
		if (trx_addons_meta_box_is_registered($post_type)) {
			// Load saved options 
			$options = apply_filters( 'trx_addons_filter_load_post_options', get_post_meta($post->ID, 'trx_addons_options', true), $post->ID, $post_type );
			$meta_box = trx_addons_meta_box_get($post_type);
			foreach ($meta_box as $k=>$v) {
				if (isset($meta_box[$k]['std'])) {
					$meta_box[$k]['val'] = isset($options[$k]) ? $options[$k] : $meta_box[$k]['std'];
				}
			}
			?>
			<div class="trx_addons_options">
				<input type="hidden" name="meta_box_post_nonce" value="<?php echo esc_attr(wp_create_nonce(admin_url())); ?>" />
				<input type="hidden" name="meta_box_post_type" value="<?php echo esc_attr($post_type); ?>" />
				<?php trx_addons_options_show_fields($meta_box, $post_type); ?>
			</div>
			<?php		
		}
	}
}

// Save data from meta box
if (!function_exists('trx_addons_meta_box_save')) {
	add_action('save_post', 'trx_addons_meta_box_save');
	function trx_addons_meta_box_save($post_id) {

		// verify nonce
		if ( !wp_verify_nonce( trx_addons_get_value_gp('meta_box_post_nonce'), admin_url() ) )
			return $post_id;

		// check autosave
		if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
			return $post_id;
		}

		$post_type = isset($_POST['meta_box_post_type']) ? $_POST['meta_box_post_type'] : $_POST['post_type'];
		if ( ! trx_addons_meta_box_is_registered($post_type)) {
			return $post_id;
		}

		// check permissions
		$capability = 'post';
		$post_types = get_post_types( array( 'name' => $post_type ), 'objects' );
		if (!empty($post_types) && is_array($post_types)) {
			foreach ($post_types  as $type) {
				$capability = $type->capability_type;
				break;
			}
		}
		if ( ! current_user_can( "edit_{$capability}", $post_id ) ) {
			return $post_id;
		}

		// Save meta
		$options = array();
		$meta_box = trx_addons_meta_box_get($post_type);
		foreach ($meta_box as $k=>$v) {
			// Skip options without value (section, info, etc.)
			if (!isset($v['std'])) continue;
			// Get option value from POST
			$options[$k] = trx_addons_options_get_field_value($k, $v);
			if ($k == 'icon' && strtolower($options[$k]) == 'none') $options[$k] = '';
		}
		update_post_meta($post_id, 'trx_addons_options', apply_filters('trx_addons_filter_save_post_options', $options, $post_id, $post_type));
	}
}
