<?php

class SimpleTags_Admin_Autocomplete {

	public function __construct() {
		// Ajax action, JS Helper and admin action
		add_action( 'wp_ajax_' . 'simpletags', array( __CLASS__, 'ajax_check' ) );

		// Save tags from advanced input
		add_action( 'save_post', array( __CLASS__, 'save_post' ), 10, 2 );

		// Box for advanced tags
		add_action( 'add_meta_boxes', array( __CLASS__, 'add_meta_boxes' ), 999 );

		// Simple Tags hook
		add_action( 'simpletags-auto_terms', array( __CLASS__, 'auto_terms_js' ) );
		add_action( 'simpletags-manage_terms', array( __CLASS__, 'manage_terms_js' ) );
		add_action( 'simpletags-mass_terms', array( __CLASS__, 'mass_terms_js' ) );

		// Javascript
		add_action( 'admin_enqueue_scripts', array( __CLASS__, 'admin_enqueue_scripts' ), 11 );
	}

	/**
	 * Init somes JS and CSS need for this feature
	 *
	 * @return void
	 * @author Amaury Balmer
	 */
	public static function admin_enqueue_scripts() {
		global $pagenow;

		// Register JS/CSS
		wp_register_script( 'st-helper-autocomplete', STAGS_URL . '/assets/js/helper-autocomplete.js', array(
			'jquery',
			'jquery-ui-autocomplete'
		), STAGS_VERSION );

		// Register location
		$wp_post_pages = array( 'post.php', 'post-new.php' );
		$wp_page_pages = array( 'page.php', 'page-new.php' );

		// Helper for posts/pages and for Auto Tags, Mass Edit Tags and Manage tags !
		if ( ( in_array( $pagenow, $wp_post_pages ) || ( in_array( $pagenow, $wp_page_pages ) && is_page_have_tags() ) ) || ( isset( $_GET['page'] ) && in_array( $_GET['page'], array(
					'st_auto',
					'st_mass_terms',
					'st_manage'
				) ) )
		) {
			wp_enqueue_script( 'st-helper-autocomplete' );
		}
	}

	/**
	 * Ajax Dispatcher
	 *
	 */
	public static function ajax_check() {
		if ( isset( $_GET['stags_action'] ) && $_GET['stags_action'] == 'helper_js_collection' ) {
			self::ajax_local_tags();
		}
	}

	/**
	 * Display a javascript collection for autocompletion script !
	 *
	 * @return void
	 * @author Amaury Balmer
	 */
	public static function ajax_local_tags() {
		status_header( 200 ); // Send good header HTTP
		header( "Content-Type: application/json; charset=" . get_bloginfo( 'charset' ) );

		$taxonomy = 'post_tag';
		if ( isset( $_REQUEST['taxonomy'] ) && taxonomy_exists( $_REQUEST['taxonomy'] ) ) {
			$taxonomy = $_REQUEST['taxonomy'];
		}

		if ( (int) wp_count_terms( $taxonomy, 'ignore_empty=false' ) == 0 ) { // No tags to suggest
			json_encode( array() );
			exit();
		}

		// Prepare search
		$search = ( isset( $_GET['term'] ) ) ? trim( stripslashes( $_GET['term'] ) ) : '';

		// Get all terms, or filter with search
		$terms = SimpleTags_Admin::getTermsForAjax( $taxonomy, $search );
		if ( empty( $terms ) || $terms == false ) {
			json_encode( array() );
			exit();
		}

		// Format terms
		$results = array();
		foreach ( (array) $terms as $term ) {
			$term->name = stripslashes( $term->name );
			$term->name = str_replace( array( "\r\n", "\r", "\n" ), '', $term->name );

			$results[] = array( 'id' => $term->term_id, 'label' => $term->name, 'value' => $term->name );
		}

		echo json_encode( $results );
		exit();
	}

	/**
	 * Save tags input for old field
	 *
	 * @param string $post_id
	 * @param object $object
	 *
	 * @return boolean
	 * @author Amaury Balmer
	 */
	public static function save_post( $post_id = 0, $object = null ) {
		if ( isset( $_POST['adv-tags-input'] ) ) {
			// Trim/format data
			$tags = preg_replace( "/[\n\r]/", ', ', stripslashes( $_POST['adv-tags-input'] ) );
			$tags = trim( $tags );

			// String to array
			$tags = explode( ',', $tags );

			// Remove empty and trim tag
			$tags = array_filter( $tags, '_delete_empty_element' );

			// Add new tag (no append ! replace !)
			wp_set_object_terms( $post_id, $tags, 'post_tag' );

			// Clean cache
			clean_post_cache( $post_id );

			return true;
		}

		return false;
	}

	/**
	 * Call meta box public static function for taxonomy tags for each CPT
	 *
	 * @param string $post_type
	 *
	 * @return boolean
	 * @author Amaury Balmer
	 */
	public static function add_meta_boxes( $post_type ) {
		$taxonomies = get_object_taxonomies( $post_type );
		if ( in_array( 'post_tag', $taxonomies ) ) {
			if ( $post_type == 'page' && ! is_page_have_tags() ) {
				return false;
			}

			remove_meta_box( 'post_tag' . 'div', $post_type, 'side' );
			remove_meta_box( 'tagsdiv-' . 'post_tag', $post_type, 'side' );

			add_meta_box( 'adv-tagsdiv', __( 'Tags (Simple Tags)', 'simpletags' ), array(
				__CLASS__,
				'metabox'
			), $post_type, 'side', 'core', array( 'taxonomy' => 'post_tag' ) );

			return true;
		}

		return false;
	}

	/**
	 * Content of custom meta box of Simple Tags
	 *
	 * @param object $post
	 *
	 * @return void
	 * @author Amaury Balmer
	 */
	public static function metabox( $post ) {
		// Get options
		$autocomplete_min = (int) SimpleTags_Plugin::get_option_value( 'autocomplete_min' );
		?>
		<p>
			<?php if ( SimpleTags_Plugin::get_option_value( 'autocomplete_type' ) == 'textarea' ) : ?>
				<textarea class="widefat" name="adv-tags-input" id="adv-tags-input" rows="3"
				          cols="5"><?php echo SimpleTags_Admin::getTermsToEdit( 'post_tag', $post->ID ); ?></textarea>
			<?php else : ?>
				<input type="text" class="widefat" name="adv-tags-input" id="adv-tags-input"
				       value="<?php echo esc_attr( SimpleTags_Admin::getTermsToEdit( 'post_tag', $post->ID ) ); ?>"/>
			<?php endif; ?>

			<?php _e( 'Separate tags with commas', 'simpletags' ); ?>
		</p>
		<script type="text/javascript">
			<!--
			st_init_autocomplete('#adv-tags-input', '<?php echo admin_url("admin-ajax.php?action=simpletags&stags_action=helper_js_collection"); ?>', <?php echo $autocomplete_min; ?>);
			-->
		</script>
		<?php
	}

	/**
	 * public static function called on auto terms page
	 *
	 * @param string $taxonomy
	 *
	 * @return void
	 * @author Amaury Balmer
	 */
	public static function auto_terms_js( $taxonomy = '' ) {
		// Get option
		$autocomplete_min = (int) SimpleTags_Plugin::get_option_value( 'autocomplete_min' );
		?>
		<script type="text/javascript">
			<!--
			st_init_autocomplete('#auto_list', "<?php echo admin_url('admin-ajax.php?action=simpletags&stags_action=helper_js_collection&taxonomy='.$taxonomy); ?>", <?php echo $autocomplete_min; ?>);
			-->
		</script>
		<?php
	}

	/**
	 * public static function called on manage terms page
	 *
	 * @param string $taxonomy
	 *
	 * @return void
	 * @author Amaury Balmer
	 */
	public static function manage_terms_js( $taxonomy = '' ) {
		// Get option
		$autocomplete_min = (int) SimpleTags_Plugin::get_option_value( 'autocomplete_min' );
		?>
		<script type="text/javascript">
			<!--
			st_init_autocomplete('.autocomplete-input', "<?php echo admin_url('admin-ajax.php?action=simpletags&stags_action=helper_js_collection&taxonomy='.$taxonomy); ?>", <?php echo $autocomplete_min; ?>);
			-->
		</script>
		<?php
	}

	/**
	 * public static function called on mass terms page
	 *
	 * @param string $taxonomy
	 *
	 * @return void
	 * @author Amaury Balmer
	 */
	public static function mass_terms_js( $taxonomy = '' ) {
		// Get option
		$autocomplete_min = (int) SimpleTags_Plugin::get_option_value( 'autocomplete_min' );
		?>
		<script type="text/javascript">
			<!--
			st_init_autocomplete('.autocomplete-input', "<?php echo admin_url('admin-ajax.php?action=simpletags&stags_action=helper_js_collection&taxonomy='.$taxonomy); ?>", <?php echo $autocomplete_min; ?>);
			-->
		</script>
		<?php
	}
}