class-settings.php

<?php
/**
 * Settings
 *
 * The plugin settings.
 *
 * @package WPLDP
 * @version 1.0.0
 * @author  Benoit Alessandroni
 * @license https://www.gnu.org/licenses/gpl-2.0.txt GNU/GPLv2
 * @since  2.0.0
 */

namespace WpLdp;

if ( ! class_exists( '\WpLdp\Settings' ) ) {
	/**
	 * Handles everything related to the admin settings.
	 *
	 * @category Class
	 * @package WPLDP
	 * @author    Benoit Alessandroni
	 * @license https://www.gnu.org/licenses/gpl-2.0.txt GNU/GPLv2
	 */
	class Settings {
		/**
		 * Class default constructor.
		 */
		public function __construct() {
			add_action( 'admin_menu', array( $this, 'ldp_menu' ) );
			add_action( 'admin_menu', array( $this, 'menu_setup' ) );
			add_action( 'admin_init', array( $this, 'backend_hooking' ) );
		}

		/**
		 * Initializes the PAIR containers if the associated
		 * option is checked.
		 *
		 * @param  {boolean} $force Should the refresh be forced.
		 */
		function initialize_container( $force = false ) {
			if ( isset( $_GET['settings-updated'] ) || $force ) {
				$ldp_container_init = get_option( 'ldp_container_init', false );

				if ( $ldp_container_init || $force ) {
					$pair_terms = array(
						'initiative' => array(
							'label' => __( 'Initiative', 'wpldp' ),
							'rdftype' => 'pair:initiative',
						),
						'organization' => array(
							'label' => __( 'Organization', 'wpldp' ),
							'rdftype' => 'foaf:organization',
						),
						'group' => array(
							'label' => __( 'Group', 'wpldp' ),
							'rdftype' => 'foaf:group',
						),
						'document' => array(
							'label' => __( 'Document', 'wpldp' ),
							'rdftype' => 'foaf:document',
						),
						'goodorservice' => array(
							'label' => __( 'Good or Service', 'wpldp' ),
							'rdftype' => 'goodRelation:goodOrService',
						),
						'artwork' => array(
							'label' => __( 'Artwork', 'wpldp' ),
							'rdftype' => 'schema:artwork',
						),
						'event' => array(
							'label' => __( 'Event', 'wpldp' ),
							'rdftype' => 'schema:event',
						),
						'place' => array(
							'label' => __( 'Place', 'wpldp' ),
							'rdftype' => 'schema:place',
						),
						'theme' => array(
							'label' => __( 'Theme', 'wpldp' ),
							'rdftype' => 'pair:theme',
						),
						'thesis' => array(
							'label' => __( 'Thesis', 'wpldp' ),
							'rdftype' => 'pair:thesis',
						),
						'person' => array(
							'label' => __( 'Person', 'wpldp' ),
							'rdftype' => 'pair:person',
						)
					);

					foreach ( $pair_terms as $term => $properties ) {
						// Loop on the models files (or hardcoded array) and push them each as taxonomy term in the database.
						$model = file_get_contents( __DIR__ . '/models/' . $term . '.json' );
						$term_id = null;

						if ( ! term_exists( $term, 'ldp_container' ) ) {
							$new_term = wp_insert_term(
								$properties['label'],
								'ldp_container',
								array(
									'slug' => $term,
									'description' => sprintf(
										__(
											'The %1$s object model',
											'wpldp'
										),
										$term
									),
								)
							);

							$term_id = $new_term['term_id'];
						} else {
							$existing_term = get_term_by( 'slug', $term, 'ldp_container' );
							$updated_term = wp_update_term(
								$existing_term->term_id,
								'ldp_container',
								array(
									'slug' => $term,
									'description' => sprintf(
										__(
											'The %1$s object model',
											'wpldp'
										),
										$term
									),
								)
							);

							$term_id = $existing_term->term_id;
						}

						if ( ! empty( $term_id ) ) {
							$term_meta = get_option( "ldp_container_$term_id" );
							if ( ! is_array( $term_meta ) ) {
								$term_meta = array();
							}

							$term_meta['ldp_rdf_type'] = $properties['rdftype'];
							$term_meta['ldp_model'] = stripslashes_deep( $model );
							update_option( "ldp_container_$term_id", $term_meta );
						}
					}
				}
			}
		}


		/**
		 * Overrides the default update message or/and add a new one.
		 *
		 * @return void
		 */
		function wpldp_validation_notice() {
			global $pagenow;
			if ( 'options-general.php' === $pagenow && 'wpldp' === $_GET['page'] ) { // change my-plugin to your plugin page.
				if ( ( isset( $_GET['settings-updated'] ) && 'true' === $_GET['settings-updated'] ) ) {

					$ldp_container_init = get_option( 'ldp_container_init', false );
					if ( $ldp_container_init ) {
						$update_message = __( 'The PAIR containers have been initialized, enjoy ;-)', 'wpldp' );
						add_settings_error( 'general', 'settings_updated', $update_message, 'updated' );
					}
				}
			}
		}

		/**
		 * Generates the containers-filtered menu entries.
		 *
		 * @return void
		 */
		function menu_setup() {
			global $submenu;
			// Removing all resources menu.
			remove_submenu_page( 'edit.php?post_type=ldp_resource', 'edit.php?post_type=ldp_resource' );
			$terms = get_terms(
				'ldp_container',
				array(
					'hide_empty' => 0,
					'order' => 'DESC'
				)
			);

			$i = 0;
			foreach ( $terms as $term ) {
				$this->term_slug = $term->slug;
				add_submenu_page(
					'edit.php?post_type=ldp_resource',
					sprintf(
						__( 'List of all resources of type %1$s', 'wpldp' ),
						$term->name
					),
					$term->name,
					'edit_posts',
					'edit.php?post_type=ldp_resource&ldp_container=' . $term->slug,
					false
				);

				// Reordering position of menu pages.
				$key_to_remove = null;
				foreach ( $submenu['edit.php?post_type=ldp_resource'] as $submenu_item_key => $submenu_item_value ) {
					if ( $submenu_item_value[0] === $term->name ) {
						$submenu['edit.php?post_type=ldp_resource'][ 10 - $i ] = $submenu_item_value;
						$key_to_remove = $submenu_item_key;
					}
				}

				if ( ! empty( $key_to_remove ) ) {
					unset( $submenu['edit.php?post_type=ldp_resource'][ $key_to_remove ] );
				}
				$i++;
			}
			ksort( $submenu['edit.php?post_type=ldp_resource'] );
		}

		/**
		 * Generates the plugin settings menu and associated page.
		 *
		 * @return void
		 */
		function ldp_menu() {
			$hook = add_options_page(
				__( 'WP-LDP Settings', 'wpldp' ),
				__( 'WP-LDP Settings', 'wpldp' ),
				'edit_posts',
				'wpldp',
				array( $this, 'wpldp_options_page' )
			);

			add_action( 'load-' . $hook, array( $this, 'initialize_container' ) );
			add_action( 'admin_notices', array( $this, 'wpldp_validation_notice' ) );
		}

		/**
		 * Populates the plugin option page.
		 *
		 * @return void
		 */
		function wpldp_options_page() {
			echo '<div class="wrap">';
			echo '<h2>' . __( 'WP-LDP Settings', 'wpldp' ) . '</h2>';
			echo '<form method="post" action="options.php">';
			settings_fields( 'ldp_settings' );
			do_settings_sections( 'wpldp' );
			submit_button();
			echo '</form>';
			echo '</div>';
		}

		/**
		 * Adds the custom JSON-LD context field.
		 *
		 * @return void
		 */
		function ldp_context_field() {
			echo "<input type='text' size='150' name='ldp_context' value='" . get_option( 'ldp_context', 'http://lov.okfn.org/dataset/lov/context' ) . "' />";
		}

		/**
		 * Initis the checkbox for container init.
		 *
		 * @return void
		 */
		function ldp_container_init_field() {
			$option_value = get_option( 'ldp_container_init', false );
			$option_value = ! empty( $option_value ) ? 1 : 0;
			echo '<input type=\'checkbox\' name=\'ldp_container_init\' value=\'1\' ' . checked( $option_value, 1, false ) . ' />';
		}

		/**
		 * Adds every needed fiels to the options page.
		 *
		 * @return void
		 */
		function backend_hooking() {
			add_settings_section(
				'ldp_settings',
				__( 'WP-LDP Settings', 'wpldp' ),
				function() {
					echo __( 'The generals settings of the WP-LDP plugin.', 'wpldp' );
				},
				'wpldp'
			);

			add_settings_field(
				'ldp_context',
				__( 'WP-LDP Context', 'wpldp' ),
				array( $this, 'ldp_context_field' ),
				'wpldp',
				'ldp_settings'
			);

			add_settings_field(
				'ldp_container_init',
				__( 'Do you want to initialize PAIR containers ?', 'wpldp' ),
				array( $this, 'ldp_container_init_field' ),
				'wpldp',
				'ldp_settings'
			);

			register_setting( 'ldp_settings', 'ldp_context' );
			register_setting( 'ldp_settings', 'ldp_container_init' );
		}
	}

	$wpldp_settings = new Settings();
} else {
	exit( 'Class Settings already exists' );
}