<?php
/* 
 * Plugin Name:       AdSense In-feed Placement for WordPress
 * Plugin URI:        https://wpadvancedads.com
 * Description:       Display AdSense In-feed ads between posts
 * Version:           1.1
 * Author:            Thomas Maier
 * Author URI:        https://webgilde.com
 * Text Domain:       advanced-ads-adsense-in-feed
 * Domain Path:       /languages
 * License:           GPL-2.0+
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
 * 
*/

if (!defined('ABSPATH')) {
    die('-1');
}

class Advanced_Ads_In_Feed {
	function __construct(){
		add_action('plugins_loaded', array($this, 'plugins_loaded'));
		add_action('init', array($this, 'check_dependencies'));
	}
	
	function plugins_loaded(){
		if (! defined('ADVADS_VERSION') ) {
			return;
		}
		// load translations		
		add_filter( 'advanced-ads-placement-types', array( $this, 'add_placement_types' ) );
		// inject ads into archive pages
		add_action( 'the_post', array( $this, 'inject_in_feed' ), 20, 2 );
		// options for placement
		add_action( 'advanced-ads-placement-options-before', array( $this, 'placement_options_check' ), 10, 2 );
		add_action( 'advanced-ads-placement-options-after', array( $this, 'placement_options' ), 11, 2 );
	}


	public function check_dependencies(){
		// Check if Advanced Ads is installed
		if (! defined('ADVADS_VERSION') ) {
		    // Display notice that Advanced Ads is required
		    add_action('admin_notices', array($this, 'show_advads_version_notice'));
		}
	}

	/**
	 * add placement types
	 *
	 * @since   1.0.0
	 * @param array $types
	 *
	 * @return array $types
	 */
	public function add_placement_types( $types ) {    
		// ad injection at a hand selected element in the frontend
		$types['adsense_in_feed'] = array(
			'title' => __( 'AdSense In-feed', 'advanced-ads-adsense-in-feed' ),
			'description' => __( 'Display an AdSense In-feed ad between posts', 'advanced-ads-adsense-in-feed' ),
			'image' => plugin_dir_url( __FILE__ ) . 'adsense-in-feed.png',
			'options' => array( 'show_position' => true, 'show_lazy_load' => true  )
		);

		return $types;
	}

	/**
	 * echo ad before/after posts in loops on archive pages
	 *
	 * @since 1.0
	 * @param arr $post post object
	 * @param WP_Query $wp_query query object
	 */
	public function inject_in_feed( $post, $wp_query = null ) {
		if ( ! $wp_query instanceof WP_Query 
			|| is_feed() 
			|| is_admin() 
			|| $wp_query->is_singular() 
			|| ! $wp_query->in_the_loop 
			|| ! isset( $wp_query->current_post )
			|| ! $wp_query->is_main_query() ){
			return;
		}

		$curr_index = $wp_query->current_post + 1; // normalize index

		// handle the situation when wp_reset_postdata() is used after secondary query inside main query
		static $handled_indexes = array();
		if ( isset( $handled_indexes[ $curr_index ] ) ) {
			return;
		}
		$handled_indexes[] = $curr_index;

		$placements = get_option( 'advads-ads-placements', array() );
		if( is_array( $placements ) ){
			foreach ( $placements as $_placement_id => $_placement ){
				if ( empty($_placement['item']) ) {
					continue;
				}
				
				if ( isset($_placement['type']) && 'adsense_in_feed' === $_placement['type'] ){
					$_options = isset( $_placement['options'] ) ? $_placement['options'] : array();
					$ad_index = isset( $_options['adsense_in_feed_pages_index'] ) ? absint( ( $_options['adsense_in_feed_pages_index'] ) ) : 1;
					if( $ad_index === $curr_index ){
						$_options['placement']['type'] = $_placement['type'];
						if( isset( $_placement['item'] ) && $this->is_infeed_ad_item( $_placement['item'] ) ) {
							echo Advanced_Ads_Select::get_instance()->get_ad_by_method( $_placement_id, Advanced_Ads_Select::PLACEMENT, $_options );
						}
					}
				}
			}
		}
	}    
	
	/**
	 * check if the current ad is indeed an infeed item
	 * 
	 * @param   str	    item ID from a placement
	 * @return  bool    true if it is an infeed ad
	 */
	private function is_infeed_ad_item( $item_id ){
		$_item = explode( '_', $item_id );
		
		if ( 'ad' !== $_item[0] || ! isset( $_item[1] ) || empty( $_item[1] ) ) {
			return false;
		}
		
		// load the ad
		$ad = new Advanced_Ads_Ad( $_item[1] );
		if( isset( $ad->type ) 
			&& 'adsense' === $ad->type 
			&& isset( $ad->content)
			&& strpos( $ad->content, 'in-feed' ) ){
		    return true;
		}
		
		return false;
	}

	public function show_advads_version_notice() {
		$plugin_data = get_plugin_data(__FILE__);
		$plugins = get_plugins();
		if( isset( $plugins['advanced-ads/advanced-ads.php'] ) ){ // is installed, but not active
		    $link = '<a class="button button-primary" href="' . wp_nonce_url( 'plugins.php?action=activate&amp;plugin=advanced-ads/advanced-ads.php&amp', 'activate-plugin_advanced-ads/advanced-ads.php' ) . '">'. __('Activate Now', 'advanced-ads-adsense-in-feed') .'</a>';
		} else {
		    $link = '<a class="button button-primary" href="' . wp_nonce_url(self_admin_url('update.php?action=install-plugin&plugin=' . 'advanced-ads'), 'install-plugin_' . 'advanced-ads') . '">'. __('Install Now', 'advanced-ads-adsense-in-feed') .'</a>';
		}
		echo '
		<div class="error">
		  <p>'.sprintf(__('<strong>%s</strong> requires the <strong><a href="https://wpadvancedads.com" target="_blank">Advanced Ads</a></strong> plugin to be installed and activated on your site.', 'advanced-ads-adsense-in-feed'), $plugin_data['Name']) .
		     '&nbsp;' . $link . '</p></div>';
	}

	function load_plugin_textdomain() {
		load_plugin_textdomain( 'advanced-ads-adsense-in-feed', FALSE, basename( dirname( __FILE__ ) ) . '/languages/' );
	}

	/**
	 * check if this is indeed an In-feed ad
	 *
	 * @since 1.0
	 * @param string $placement_slug id of the placement
	 *
	 */
	public function placement_options_check( $placement_slug, $placement ){
		if( isset( $placement['type'] ) && 'adsense_in_feed' === $placement['type'] ){
			// check if this is the correct item type (AdSense In-feed)
			if( isset( $placement['item'] ) && ! $this->is_infeed_ad_item( $placement['item'] ) ){
				echo '<p class="advads-error-message">' . sprintf( __( 'This placement can only deliver a single In-feed ad. Use the <a href="%s" target="_blank">Post Lists placement</a> for other ad types.', 'advanced-ads-adsense-in-feed' ), ADVADS_URL . 'manual/placement-post-lists/' ) . '</p>';
			}
		}
	}
	
	/**
	 * render placement options
	 *
	 * @since 1.0
	 * @param string $placement_slug id of the placement
	 *
	 */
	public function placement_options( $placement_slug, $placement ){
		if( isset( $placement['type'] ) && 'adsense_in_feed' === $placement['type'] ){
			$index = (isset($placement['options']['adsense_in_feed_pages_index'])) ? $placement['options']['adsense_in_feed_pages_index'] : 1;
			$index_option = '<input type="number" name="advads[placements][' . $placement_slug . '][options][adsense_in_feed_pages_index]" value="'
			    . $index . '" name="advads-placements-adsense-in-feed-index' . $placement_slug . '"/>';
			$option_content = sprintf(__( 'Inject before %s. post', 'advanced-ads-adsense-in-feed' ), $index_option );

			$description = __( 'Before which post to inject the ad on post lists.', 'advanced-ads-adsense-in-feed' );
			if( class_exists( 'Advanced_Ads_Admin_Options' ) ){
				Advanced_Ads_Admin_Options::render_option( 
					'placement-in-feed-position', 
					__( 'position', 'advanced-ads-adsense-in-feed' ),
					$option_content,
					$description );
			}
		}
	}    

}
new Advanced_Ads_In_Feed();