<?php

/**
 * AdPlugg Facebook class.
 * The AdPlugg Facebook class controls admin function for AdPlugg's Facebook
 * intragration.  This class is used by both the frontend and the admin.
 *
 * @package AdPlugg
 * @since 1.3.0
 */
class AdPlugg_Facebook {
    
    // class instance
    static $instance;
    
    /**
     * Constructor, constructs the class and registers filters and actions.
     */
    function __construct() {
        add_action( 'widgets_init', array( &$this, 'facebook_instant_articles_header_widget_area_init' ) );
    }
    
    /**
     * Add the Facebook Instant Articles Header widget area.
     */
    function facebook_instant_articles_header_widget_area_init() {
        if(self::is_ia_automatic_placement_enabled()) {
            register_sidebar( array(
                    'name'          => 'Facebook Instant Articles Ads',
                    'id'            => 'facebook_ia_header_ads',
                    'description'   => 'Drag the AdPlugg Widget here to have AdPlugg Ads automatically included in your Facebook Instant Articles.',
            ) );
        }
    }
    
    /**
     * Function that looks to see if an adplugg access code has been installed.
     * @return boolean Returns true if an facebook instant articles automatic ad
     * placement is enabled, otherwise returns false.
     */
    static function is_ia_automatic_placement_enabled() {
        $options = get_option( ADPLUGG_FACEBOOK_OPTIONS_NAME, array() );
        $enabled = false;
        if( ! empty( $options['ia_enable_automatic_placement'] ) ) {
            $enabled = ($options['ia_enable_automatic_placement'] == 1) ? true : false;
        }

        return $enabled;
    }
    
    /*
     * Singleton instance 
     */
    public static function get_instance() {
        if ( ! isset( self::$instance ) ) {
            self::$instance = new self();
        }

        return self::$instance;
    }
}