<?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 {
    
    /**
     * Singleton instance.
     * @var AdPlugg_Facebook 
     */
    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_action( 'instant_articles_compat_registry_ads', array( $this, 'add_to_registry' ), 10, 1 );
    }
    
    /**
     * 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 Facebook Instant Articles automatic ad
     * placement is enabled.
     * @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;
    }
    
    /**
     * Function that looks to see if the temporary Use Legacy adplugg.com 
     * Endpoint setting is turned on.
     * @return boolean Returns true if the temporary Use Legacy adplugg.com 
     * Endpoint setting is turned on, otherwise returns false.
     */
    static function temp_use_legacy_adplugg_com_endpoint() {
        $options = get_option( ADPLUGG_FACEBOOK_OPTIONS_NAME, array() );
        $enabled = false;
        if( ! empty( $options['temp_use_legacy_adplugg_com_endpoint'] ) ) {
            $enabled = ($options['temp_use_legacy_adplugg_com_endpoint'] == 1) ? true : false;
        }

        return $enabled;
    }
    
    /**
     * Function that looks to see if the temporary Allow Legacy adplugg.com 
     * Endpoint setting is turned on.
     * @return boolean Returns true if the temporary Allow Legacy adplugg.com 
     * Endpoint setting is turned on, otherwise returns false.
     */
    static function temp_allow_legacy_adplugg_com_endpoint() {
        $options = get_option( ADPLUGG_FACEBOOK_OPTIONS_NAME, array() );
        $enabled = false;
        if( ! empty( $options['temp_allow_legacy_adplugg_com_endpoint'] ) ) {
            $enabled = ($options['temp_allow_legacy_adplugg_com_endpoint'] == 1) ? true : false;
        }

        return $enabled;
    }
    
    /**
     * Add AdPlugg to the Facebook Instant Articles plugin ad registry.
     * (fb-instant-articles 0.3+)
     *
     * @param array $registry Reference param. The registry where it will be stored.
     */
    function add_to_registry( &$registry ) {

        $display_name = 'AdPlugg';
        $identifier = 'adplugg';

        $registry[ $identifier ] = array(
                'name' => $display_name,
        );
    }
    
    /*
     * Singleton instance 
     */
    public static function get_instance() {
        if ( ! isset( self::$instance ) ) {
            self::$instance = new self();
        }

        return self::$instance;
    }
}