<?php
// If this file is called directly, abort.
if ( ! defined( 'ABSPATH' ) ) {
    die();
}
/**
 * The Affiliate Links Core Plugin Class.
 */
class Affiliate_Links {

    public static $plugin_name   = 'Affiliate Links';
    public static $singular_name = 'Affiliate Links';
    public static $plugin_slug   = 'affiliate-links';
    public static $text_domain   = 'affiliate-links';
    public static $post_type     = 'affiliate-links';
    public static $slug          = 'go';
    public static $settings      = false;

    public function __construct() {

        add_action( 'init', array( $this, 'register_affiliate_links' ));
        add_action( 'template_redirect', array( $this, 'redirect' ));

        if( is_admin() ){
            require_once AFFILIATE_LINKS_PLUGIN_DIR . 'admin/class-affiliate-links-metabox.php';
            require_once AFFILIATE_LINKS_PLUGIN_DIR . 'admin/class-affiliate-links-settings.php';
        }

        self::$settings = get_option( 'affiliate_links_settings' );

    }

    /**
     * Register Custom Post Type.
     */
    public function register_affiliate_links() {

        $labels = array(
            'name'           => _x( self::$plugin_name, 'Post Type General Name', self::$text_domain ),
            'singular_name'  => _x( self::$singular_name, 'Post Type Singular Name', self::$text_domain ),
            'menu_name'      => __( self::$plugin_name, 'affiliate-links' ),
            'name_admin_bar' => __( self::$plugin_name, 'affiliate-links' ),
        );

        if( !empty( self::$settings['slug'] ) ) {
           $slug = self::$settings['slug'];
        } else {
           $slug = self::$slug;
        }

        $rewrite = array(
            'slug'       => $slug,
            'with_front' => false,
            'pages'      => false,
            'feeds'      => false,
        );

        $args = array(
            'label'               => __( self::$singular_name, self::$text_domain ),
            'description'         => __( 'Affiliate Link Post Type', self::$text_domain ),
            'labels'              => $labels,
            'supports'            => array( 'title' ),
            'hierarchical'        => false,
            'public'              => true,
            'show_ui'             => true,
            'show_in_menu'        => true,
            'menu_position'       => 100,
            'menu_icon'           => 'dashicons-admin-links',
            'show_in_admin_bar'   => true,
            'show_in_nav_menus'   => true,
            'can_export'          => true,
            'has_archive'         => false,
            'exclude_from_search' => true,
            'publicly_queryable'  => true,
            'rewrite'             => $rewrite,
            'capability_type'     => 'page',
        );

        register_post_type( 'affiliate-links', $args );

    }

    /**
     * Redirect affiliate link.
     */
    public function redirect() {

        if ( is_singular( Affiliate_Links::$post_type ) ) {

            $post_id    = get_the_ID();
            $target_url = get_post_meta( $post_id, '_affiliate_links_target', true );

            if( empty( $target_url ) ){

                if( !empty( self::$settings['default'] ) ) {
                    $target_url = self::$settings['default'];
                } else {
                    $target_url = home_url( '/' );
                }

            }

            $this->count_stats( $post_id );

            if( empty( self::$settings['redirect'] ) ) {
                $redirect_type = 301;
            } else {
                $redirect_type = (int) self::$settings['redirect'];
            }

            if( !empty( self::$settings['nofollow'] ) ) {
                header( "X-Robots-Tag: noindex, nofollow", true );
            }

            wp_redirect( esc_url_raw( $target_url ), $redirect_type );
            exit();

        }

    }

    /**
     * Count link hits and update post_meta.
     */
    public function count_stats( $post_id ) {

        if( !empty( self::$settings['stats'] ) ) {

            $current = (int) get_post_meta( $post_id, '_affiliate_links_stat', true );
            update_post_meta( $post_id, '_affiliate_links_stat', $current + 1 );

        }

    }

}