<?php
if (!defined('WPINC')) {
    die;
}

class Studiou_WC_FPP_Cart {

    /** @var Studiou_WC_FPP_DB */
    private $db;

    public function __construct($db) {
        $this->db = $db;

        // AJAX add to cart
        add_action('wp_ajax_studiou_wcfpp_add_to_cart', array($this, 'ajax_add_to_cart'));
        add_action('wp_ajax_nopriv_studiou_wcfpp_add_to_cart', array($this, 'ajax_add_to_cart'));

        // Display uploaded file info in cart
        add_filter('woocommerce_get_item_data', array($this, 'display_cart_item_data'), 10, 2);

        // Save file reference to order item
        add_action('woocommerce_checkout_create_order_line_item', array($this, 'save_order_item_meta'), 10, 4);

        // Link file records to order after checkout
        add_action('woocommerce_checkout_order_processed', array($this, 'link_files_to_order'), 10, 3);

        // Ensure cart item data persists
        add_filter('woocommerce_add_cart_item_data', array($this, 'preserve_cart_item_data'), 10, 3);
    }

    public function ajax_add_to_cart() {
        check_ajax_referer('studiou-wcfpp-front-nonce', 'nonce');

        $product_id    = isset($_POST['product_id']) ? absint($_POST['product_id']) : 0;
        $variation_id  = isset($_POST['variation_id']) ? absint($_POST['variation_id']) : 0;
        $attachment_id = isset($_POST['attachment_id']) ? absint($_POST['attachment_id']) : 0;
        $file_record_id = isset($_POST['file_record_id']) ? absint($_POST['file_record_id']) : 0;

        if (!$product_id || !$variation_id || !$attachment_id || !$file_record_id) {
            wp_send_json_error(array('message' => __('Missing required data.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Verify product is FPP enabled
        if (!Studiou_WC_FPP_Product::is_fpp_product($product_id)) {
            wp_send_json_error(array('message' => __('Invalid product.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Verify the file record exists and belongs to this user
        $record = $this->db->get_file_record($file_record_id);
        if (!$record || (int) $record->attachment_id !== $attachment_id) {
            wp_send_json_error(array('message' => __('Invalid file.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Verify variation belongs to product
        $variation = wc_get_product($variation_id);
        if (!$variation || $variation->get_parent_id() !== $product_id) {
            wp_send_json_error(array('message' => __('Invalid variant.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Get variation attributes for cart
        $variation_data = array();
        $attributes = $variation->get_variation_attributes();
        foreach ($attributes as $key => $value) {
            $variation_data[$key] = $value;
        }

        // Custom cart item data
        $cart_item_data = array(
            'studiou_fpp_attachment_id'  => $attachment_id,
            'studiou_fpp_file_record_id' => $file_record_id,
            'studiou_fpp_file_name'      => $record->file_name,
        );

        // Update file record with variation
        $this->db->update_file_record($file_record_id, array(
            'variation_id' => $variation_id,
        ));

        // Add to WC cart
        $cart_item_key = WC()->cart->add_to_cart(
            $product_id,
            1,
            $variation_id,
            $variation_data,
            $cart_item_data
        );

        if ($cart_item_key) {
            wp_send_json_success(array(
                'message'        => __('Product added to cart.', 'studiou-wc-free-photo-product'),
                'cart_item_key'  => $cart_item_key,
            ));
        } else {
            wp_send_json_error(array('message' => __('Could not add to cart.', 'studiou-wc-free-photo-product')));
        }
    }

    public function preserve_cart_item_data($cart_item_data, $product_id, $variation_id) {
        // Cart item data is already set by add_to_cart call above
        return $cart_item_data;
    }

    public function display_cart_item_data($item_data, $cart_item) {
        if (isset($cart_item['studiou_fpp_file_name'])) {
            $item_data[] = array(
                'name'    => __('Uploaded Photo', 'studiou-wc-free-photo-product'),
                'value'   => esc_html($cart_item['studiou_fpp_file_name']),
                'display' => '',
            );
        }
        return $item_data;
    }

    public function save_order_item_meta($item, $cart_item_key, $values, $order) {
        if (isset($values['studiou_fpp_attachment_id'])) {
            $item->add_meta_data('_studiou_fpp_attachment_id', $values['studiou_fpp_attachment_id']);
        }
        if (isset($values['studiou_fpp_file_record_id'])) {
            $item->add_meta_data('_studiou_fpp_file_record_id', $values['studiou_fpp_file_record_id']);
        }
        if (isset($values['studiou_fpp_file_name'])) {
            $item->add_meta_data('_studiou_fpp_file_name', $values['studiou_fpp_file_name']);
            // Also add a visible meta for admin display
            $item->add_meta_data(__('Uploaded Photo', 'studiou-wc-free-photo-product'), $values['studiou_fpp_file_name']);
        }
    }

    public function link_files_to_order($order_id, $posted_data, $order) {
        foreach ($order->get_items() as $item_id => $item) {
            $file_record_id = $item->get_meta('_studiou_fpp_file_record_id');
            if ($file_record_id) {
                $this->db->link_file_to_order((int) $file_record_id, $order_id, $item_id);
            }
        }
    }
}