<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Frontend AJAX: add to cart from the video modal (no page reload),
 * mirroring WooCommerce's own add-to-cart behaviour so mini-cart /
 * cart-count plugins that hook wc_add_to_cart still fire correctly.
 */
class ADDOSHVI_Ajax {

	private static $instance = null;

	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {
		add_action( 'wp_ajax_addoshvi_add_to_cart', array( $this, 'add_to_cart' ) );
		add_action( 'wp_ajax_nopriv_addoshvi_add_to_cart', array( $this, 'add_to_cart' ) );
	}

	public function add_to_cart() {
		check_ajax_referer( 'addoshvi_frontend_nonce', 'nonce' );

		$product_id = isset( $_POST['product_id'] ) ? absint( $_POST['product_id'] ) : 0;
		$video_id   = isset( $_POST['video_id'] ) ? absint( $_POST['video_id'] ) : 0;
		$quantity   = isset( $_POST['quantity'] ) ? max( 1, absint( $_POST['quantity'] ) ) : 1;

		// The video must be a real, published video, and the product being
		// added must actually be tagged to it. Without this, a crafted
		// request could add any arbitrary WooCommerce product to the cart
		// (not just ones this video showed), or falsify a video's
		// add-to-cart count for a product it never displayed.
		if ( ! $video_id || ADDOSHVI_POST_TYPE !== get_post_type( $video_id ) || 'publish' !== get_post_status( $video_id ) ) {
			wp_send_json_error( array( 'message' => __( 'Invalid video.', 'addonn-shoppable-video' ) ) );
		}
		$tagged_products = get_post_meta( $video_id, '_addoshvi_products', true );
		$tagged_products = is_array( $tagged_products ) ? array_map( 'absint', $tagged_products ) : array();
		if ( ! in_array( $product_id, $tagged_products, true ) ) {
			wp_send_json_error( array( 'message' => __( 'This product is not available from this video.', 'addonn-shoppable-video' ) ) );
		}

		$product = wc_get_product( $product_id );
		if ( ! $product || ! $product->is_purchasable() || ! $product->is_in_stock() ) {
			wp_send_json_error( array( 'message' => __( 'This product is currently unavailable.', 'addonn-shoppable-video' ) ) );
		}

		if ( $product->is_type( 'variable' ) ) {
			// Variable products need the shopper to pick options — send them
			// to the product page instead of guessing a variation.
			wp_send_json_error( array(
				'message'   => __( 'Please choose options for this product.', 'addonn-shoppable-video' ),
				'redirect'  => get_permalink( $product_id ),
				'needs_options' => true,
			) );
		}

		$cart_item_key = WC()->cart->add_to_cart( $product_id, $quantity );

		if ( ! $cart_item_key ) {
			wp_send_json_error( array( 'message' => __( 'Could not add product to cart.', 'addonn-shoppable-video' ) ) );
		}

		ADDOSHVI_Analytics::increment( $video_id, 'cart' );

		wp_send_json_success( array(
			'message'    => __( 'Added to cart!', 'addonn-shoppable-video' ),
			'cart_count' => WC()->cart->get_cart_contents_count(),
			'cart_url'   => wc_get_cart_url(),
		) );
	}
}