<?php
/**
 * Plugin Name: AffiliateWP - Affiliate Area Tabs
 * Plugin URI: http://affiliatewp.com/
 * Description: Add custom tabs to the Affiliate Area
 * Author: Pippin Williamson and Andrew Munro
 * Author URI: http://affiliatewp.com
 * Version: 1.0.1
 * Text Domain: affiliatewp-affiliate-area-tabs
 * Domain Path: languages
 *
 * AffiliateWP is distributed under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * any later version.
 *
 * AffiliateWP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AffiliateWP. If not, see <http://www.gnu.org/licenses/>.
 */

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;

if ( ! class_exists( 'AffiliateWP_Affiliate_Area_Tabs' ) ) {

	final class AffiliateWP_Affiliate_Area_Tabs {

		/**
		 * Holds the instance
		 *
		 * Ensures that only one instance of AffiliateWP_Affiliate_Area_Tabs exists in memory at any one
		 * time and it also prevents needing to define globals all over the place.
		 *
		 * TL;DR This is a static property property that holds the singleton instance.
		 *
		 * @var object
		 * @static
		 * @since 1.0
		 */
		private static $instance;


		/**
		 * The version number of AffiliateWP
		 *
		 * @since 1.0
		 */
		private $version = '1.0.1';

		/**
		 * Main AffiliateWP_Affiliate_Area_Tabs Instance
		 *
		 * Insures that only one instance of AffiliateWP_Affiliate_Area_Tabs exists in memory at any one
		 * time. Also prevents needing to define globals all over the place.
		 *
		 * @since 1.0
		 * @static var array $instance
		 * @return The one true AffiliateWP_Affiliate_Area_Tabs
		 */
		public static function instance() {

			if ( ! isset( self::$instance ) && ! ( self::$instance instanceof AffiliateWP_Affiliate_Area_Tabs ) ) {

				self::$instance = new AffiliateWP_Affiliate_Area_Tabs;
				self::$instance->setup_constants();
				self::$instance->load_textdomain();
				self::$instance->includes();
				self::$instance->hooks();

			}

			return self::$instance;
		}

		/**
		 * Throw error on object clone
		 *
		 * The whole idea of the singleton design pattern is that there is a single
		 * object therefore, we don't want the object to be cloned.
		 *
		 * @since 1.0.0
		 * @access protected
		 * @return void
		 */
		public function __clone() {
			// Cloning instances of the class is forbidden
			_doing_it_wrong( __FUNCTION__, __( 'Cheatin&#8217; huh?', 'affiliatewp-affiliate-area-tabs' ), '1.0' );
		}

		/**
		 * Disable unserializing of the class
		 *
		 * @since 1.0.0
		 * @access protected
		 * @return void
		 */
		public function __wakeup() {
			// Unserializing instances of the class is forbidden
			_doing_it_wrong( __FUNCTION__, __( 'Cheatin&#8217; huh?', 'affiliatewp-affiliate-area-tabs' ), '1.0' );
		}

		/**
		 * Constructor Function
		 *
		 * @since 1.0.0
		 * @access private
		 */
		private function __construct() {
			self::$instance = $this;
		}

		/**
		 * Reset the instance of the class
		 *
		 * @since 1.0.0
		 * @access public
		 * @static
		 */
		public static function reset() {
			self::$instance = null;
		}

		/**
		 * Setup plugin constants
		 *
		 * @access private
		 * @since 1.0.0
		 * @return void
		 */
		private function setup_constants() {
			// Plugin version
			if ( ! defined( 'AFFWP_AAT_VERSION' ) ) {
				define( 'AFFWP_AAT_VERSION', $this->version );
			}

			// Plugin Folder Path
			if ( ! defined( 'AFFWP_AAT_PLUGIN_DIR' ) ) {
				define( 'AFFWP_AAT_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
			}

			// Plugin Folder URL
			if ( ! defined( 'AFFWP_AAT_PLUGIN_URL' ) ) {
				define( 'AFFWP_AAT_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
			}

			// Plugin Root File
			if ( ! defined( 'AFFWP_AAT_PLUGIN_FILE' ) ) {
				define( 'AFFWP_AAT_PLUGIN_FILE', __FILE__ );
			}
		}

		/**
		 * Loads the plugin language files
		 *
		 * @access public
		 * @since 1.0.0
		 * @return void
		 */
		public function load_textdomain() {

			// Set filter for plugin's languages directory
			$lang_dir = dirname( plugin_basename( __FILE__ ) ) . '/languages/';
			$lang_dir = apply_filters( 'affiliatewp_affiliate_area_tabs_languages_directory', $lang_dir );

			// Traditional WordPress plugin locale filter
			$locale   = apply_filters( 'plugin_locale',  get_locale(), 'affiliatewp-affiliate-area-tabs' );
			$mofile   = sprintf( '%1$s-%2$s.mo', 'affiliatewp-affiliate-area-tabs', $locale );

			// Setup paths to current locale file
			$mofile_local  = $lang_dir . $mofile;
			$mofile_global = WP_LANG_DIR . '/affiliatewp-affiliate-area-tabs/' . $mofile;

			if ( file_exists( $mofile_global ) ) {
				// Look in global /wp-content/languages/affiliatewp-affiliate-area-tabs/ folder
				load_textdomain( 'affiliatewp-affiliate-area-tabs', $mofile_global );
			} elseif ( file_exists( $mofile_local ) ) {
				// Look in local /wp-content/plugins/affiliatewp-affiliate-area-tabs/languages/ folder
				load_textdomain( 'affiliatewp-affiliate-area-tabs', $mofile_local );
			} else {
				// Load the default language files
				load_plugin_textdomain( 'affiliatewp-affiliate-area-tabs', false, $lang_dir );
			}
		}

		/**
		 * Include necessary files
		 *
		 * @access      private
		 * @since       1.0.0
		 * @return      void
		 */
		private function includes() {

			if ( is_admin() ) {
				require_once AFFWP_AAT_PLUGIN_DIR . 'includes/class-admin.php';
			}
		}

		/**
		 * Setup the default hooks and actions
		 *
		 * @since 1.0.0
		 * @return void
		 */
		private function hooks() {

			// plugin meta
			add_filter( 'plugin_row_meta', array( $this, 'plugin_meta' ), null, 2 );

			// add new tab to affiliate area
			add_action( 'affwp_affiliate_dashboard_tabs', array( $this, 'add_tab' ), 10, 2 );

			// add the tab's content
			add_action( 'affwp_affiliate_dashboard_bottom', array( $this, 'tab_content' ) );

			// redirect if non-affiliate tries to access a tab's page
			add_action( 'template_redirect', array( $this, 'redirect' ) );

		}

		/**
		 * Prevent non-affiliates from accessing any page that is added as a tab
		 *
		 * @since 1.0.1
		 * @return array $page_ids
		 */
		public function protected_page_ids() {
			$page_ids = wp_list_pluck( $this->get_tabs(), 'id' );
			return $page_ids;
		}

		/**
		 * Redirect to affiliate login page if content is accessed
		 *
		 * @since 1.0.1
		 * @return void
		 */
		public function redirect() {

			$redirect = affiliate_wp()->settings->get( 'affiliates_page' ) ? get_permalink( affiliate_wp()->settings->get( 'affiliates_page' ) ) : site_url();
			$redirect = apply_filters( 'affiliatewp-affiliate-area-tabs', $redirect );

			if ( in_array( get_the_ID(), $this->protected_page_ids() ) && ( ! affwp_is_affiliate() ) ) {
				wp_redirect( $redirect );
				exit;
			}

		}

		/**
		 * Get tabs
		 *
		 * @since 1.0.0
		 */
		public function get_tabs() {

			$tabs = affiliate_wp()->settings->get( 'affiliate_area_tabs' );

			if ( ! empty( $tabs ) ) {
				$tabs = array_values( $tabs );
			}

			return $tabs;
		}

		/**
		 * Make slug
		 * http://stackoverflow.com/questions/2955251/php-function-to-make-slug-url-string
		 *
		 * @since 1.0.0
		 */
		public function make_slug( $title = '' ) {

			// replace non letter or digits by -
			 $title = preg_replace( '~[^\pL\d]+~u', '-', $title );

			 // transliterate
			 $title = iconv( 'utf-8', 'us-ascii//TRANSLIT', $title );

			 // remove unwanted characters
			 $title = preg_replace( '~[^-\w]+~', '', $title );

			 // trim
			 $title = trim( $title, '-' );

			 // remove duplicate -
			 $title = preg_replace( '~-+~', '-', $title );

			 // lowercase
			 $title = strtolower( $title );

			 if ( empty( $title ) ) {
			   return 'n-a';
			 }

			 return $title;

		}

		/**
		 * Tab content
		 *
		 * @since 1.0.0
		 */
		public function tab_content( $affiliate_id ) {

			// get tabs
			$tabs = $this->get_tabs();

			if ( $tabs ) : ?>

			<?php foreach ( $tabs as $tab ) :

				$post = get_post( $tab['id'] );

				$tab_slug = $this->make_slug( $tab['title'] );

				if ( isset( $_GET['tab'] ) && $_GET['tab'] !== $tab_slug ) {
					continue;
				}

				// a tab's content cannot be the content of the page you're currently viewing
				if ( get_the_ID() === $post->ID ) {
					continue;
				}

				?>
				<div id="affwp-affiliate-dashboard-tab-<?php echo $tab_slug; ?>" class="affwp-tab-content">
					<?php echo apply_filters( 'the_content', $post->post_content ); ?>
				</div>
			<?php endforeach; ?>

			<?php endif; ?>

		<?php
		}

		/**
		 * Add tab
		 *
		 * @since 1.0.0
		 * @return void
		 */
		public function add_tab( $affiliate_id, $active_tab ) {

			$tabs = $this->get_tabs();

			if ( $tabs ) : ?>

				<?php foreach ( $tabs as $tab ) :
					$tab_slug = $this->make_slug( $tab['title'] );

					$post = get_post( $tab['id'] );

					// a tab's content cannot be the content of the page you're currently viewing
					if ( get_the_ID() === $post->ID ) {
						continue;
					}

					?>
					<li class="affwp-affiliate-dashboard-tab<?php echo $active_tab == $tab_slug ? ' active' : ''; ?>">
						<a href="<?php echo esc_url( add_query_arg( 'tab', $tab_slug ) ); ?>"><?php echo $tab['title']; ?></a>
					</li>
				<?php endforeach; ?>

			<?php endif; ?>

		<?php
		}

		/**
		 * Modify plugin metalinks
		 *
		 * @access      public
		 * @since       1.0.0
		 * @param       array $links The current links array
		 * @param       string $file A specific plugin table entry
		 * @return      array $links The modified links array
		 */
		public function plugin_meta( $links, $file ) {
		    if ( $file == plugin_basename( __FILE__ ) ) {
		        $plugins_link = array(
		            '<a title="' . __( 'Get more add-ons for AffiliateWP', 'affiliatewp-affiliate-area-tabs' ) . '" href="http://affiliatewp.com/addons/" target="_blank">' . __( 'More add-ons', 'affiliatewp-affiliate-area-tabs' ) . '</a>'
		        );

		        $links = array_merge( $links, $plugins_link );
		    }

		    return $links;
		}
	}

	/**
	 * The main function responsible for returning the one true AffiliateWP_Affiliate_Area_Tabs
	 * Instance to functions everywhere.
	 *
	 * Use this function like you would a global variable, except without needing
	 * to declare the global.
	 *
	 * Example: <?php $affiliatewp_affiliate_area_tabs = affiliatewp_affiliate_area_tabs(); ?>
	 *
	 * @since 1.0
	 * @return object The one true AffiliateWP_Affiliate_Area_Tabs Instance
	 */
	function affiliatewp_affiliate_area_tabs() {
	    if ( ! class_exists( 'Affiliate_WP' ) ) {
	        if ( ! class_exists( 'AffiliateWP_Activation' ) ) {
	            require_once 'includes/class-activation.php';
	        }

	        $activation = new AffiliateWP_Activation( plugin_dir_path( __FILE__ ), basename( __FILE__ ) );
	        $activation = $activation->run();
	    } else {
	        return AffiliateWP_Affiliate_Area_Tabs::instance();
	    }
	}
	add_action( 'plugins_loaded', 'affiliatewp_affiliate_area_tabs', 100 );

}