<?php

// add item to cart on visit
add_action( 'gens_raf_checkout_check', 'add_product_to_cart' );
function add_product_to_cart() {
	if (is_admin()) {
		return false;
	}
	$user_info = get_userdata(get_current_user_id());
	$user_email = $user_info->user_email;
	$args = array(
		'posts_per_page'   => -1,
	    'post_type'        => 'shop_coupon',
	    'post_status'      => 'publish',
		'meta_query' => array(
			'relation' => 'AND',
		    array(
			  'key' => 'customer_email',
			  'value' => $user_email,
              'compare' => 'LIKE'
		    ),
		    array(
		    	'relation' => 'OR',
		    	array(
			    	'key' => 'usage_count',
			    	'value' => '0',
			    	'compare' => 'LIKE'
			    ),
		    	array(
			    	'key' => 'usage_count',
			    	'compare' => 'NOT EXISTS'
		    	)
		    )
		),
	);
	$coupons = get_posts( $args );

	if(empty($coupons)) {
		return false;
	}
	$coupon_title = get_the_title($coupons[0]->ID);
	$product_id = 4275;
	$found = false;
	//check if product already in cart
	if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
		foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
			$_product = $values['data'];
			if ( $_product->id == $product_id )
			$found = true;
		}
		// if product not found, add it
		if ( !$found ){
			WC()->cart->add_to_cart( $product_id );
			WC()->cart->add_discount( $coupon_title );
		}
	} else {
		// if no products in cart, add it
		WC()->cart->add_to_cart( $product_id );
		WC()->cart->add_discount( $coupon_title );
	}
}