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

class Studiou_WC_FPP_Cart {

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

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

        // New per-card add-to-cart / remove-line endpoints (1.5.0)
        add_action('wp_ajax_studiou_wcfpp_add_file_to_cart',        array($this, 'ajax_add_file_to_cart'));
        add_action('wp_ajax_nopriv_studiou_wcfpp_add_file_to_cart', array($this, 'ajax_add_file_to_cart'));
        add_action('wp_ajax_studiou_wcfpp_remove_cart_line',        array($this, 'ajax_remove_cart_line'));
        add_action('wp_ajax_nopriv_studiou_wcfpp_remove_cart_line', array($this, 'ajax_remove_cart_line'));

        // Capture file data from WC session on add-to-cart
        add_filter('woocommerce_add_cart_item_data', array($this, 'add_cart_item_data'), 10, 3);

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

        // Replace cart item thumbnail with uploaded image (classic cart)
        add_filter('woocommerce_cart_item_thumbnail', array($this, 'cart_item_thumbnail'), 10, 3);

        // Show uploaded photo preview directly after item name in cart (classic cart)
        add_action('woocommerce_after_cart_item_name', array($this, 'show_cart_item_photo_preview'), 10, 2);

        // Block cart (Store API) reads the thumbnail from $cart_item['data']->get_image_id(). Stamp
        // the uploaded attachment onto a per-line clone of the product so each cart line shows its
        // OWN photo — even when several lines share the same variation_id.
        add_filter('woocommerce_get_cart_item_from_session', array($this, 'hydrate_cart_item_image'), 10, 3);

        // 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 (classic + block checkout)
        add_action('woocommerce_checkout_order_processed', array($this, 'link_files_to_order'), 10, 3);
        add_action('woocommerce_store_api_checkout_order_processed', array($this, 'link_files_to_order_from_store_api'), 10, 1);
        add_action('woocommerce_thankyou', array($this, 'link_files_to_order_fallback'), 10, 1);

        // Replace order item thumbnail with uploaded image (admin)
        add_filter('woocommerce_admin_order_item_thumbnail', array($this, 'admin_order_item_thumbnail'), 10, 3);

        // Add download link to order item in admin
        add_action('woocommerce_after_order_itemmeta', array($this, 'admin_order_item_download_link'), 10, 3);
    }

    public function add_cart_item_data($cart_item_data, $product_id, $variation_id) {
        // Check if this product (or its parent) is FPP enabled
        $fpp_product_id = $product_id;
        if (!Studiou_WC_FPP_Product::is_fpp_product($product_id)) {
            $product = wc_get_product($product_id);
            if ($product && $product->get_parent_id() && Studiou_WC_FPP_Product::is_fpp_product($product->get_parent_id())) {
                $fpp_product_id = $product->get_parent_id();
            } else {
                return $cart_item_data;
            }
        }

        // 1) New path (1.5.0+): per-card Add-to-Cart pre-stamped the file_record_id.
        if (!empty($cart_item_data['studiou_fpp_file_record_id'])) {
            $record = $this->db->get_file_record((int) $cart_item_data['studiou_fpp_file_record_id']);
            if ($record && (int) $record->order_id === 0) {
                $thumb = wp_get_attachment_image_src((int) $record->attachment_id, 'thumbnail');
                $cart_item_data['studiou_fpp_attachment_id'] = (int) $record->attachment_id;
                $cart_item_data['studiou_fpp_file_name']     = (string) $record->file_name;
                $cart_item_data['studiou_fpp_thumb_url']     = $thumb ? $thumb[0] : '';

                $this->db->update_file_record((int) $record->id, array(
                    'variation_id' => (int) ($variation_id ?: $product_id),
                ));
                return $cart_item_data;
            }
            // Stamped id is bogus — fall through to legacy resolver
            unset($cart_item_data['studiou_fpp_file_record_id']);
        }

        // 2) Legacy single-file path (shortcode / non-card callers) — fall back to the
        //    oldest unbound upload in the current batch.
        $resolved = Studiou_WC_FPP_Single_Product::resolve_uploaded_file($this->db);
        if (!$resolved) {
            return $cart_item_data;
        }

        $cart_item_data['studiou_fpp_attachment_id']  = (int) $resolved['attachment_id'];
        $cart_item_data['studiou_fpp_file_record_id'] = (int) $resolved['file_record_id'];
        $cart_item_data['studiou_fpp_file_name']      = $resolved['file_name'];
        $cart_item_data['studiou_fpp_thumb_url']      = $resolved['thumb_url'];

        $this->db->update_file_record((int) $resolved['file_record_id'], array(
            'variation_id' => (int) ($variation_id ?: $product_id),
        ));
        return $cart_item_data;
    }

    /**
     * AJAX: add one (upload × variant × qty) triple as a new cart line.
     * Called from the upload-card "Add to Cart" button.
     */
    public function ajax_add_file_to_cart() {
        check_ajax_referer('studiou-wcfpp-front-nonce', 'nonce');

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

        if (!$file_record_id || !$variation_id) {
            wp_send_json_error(array('message' => __('Invalid request.', 'studiou-wc-free-photo-product')));
            return;
        }

        $record = $this->db->get_file_record($file_record_id);
        if (!$record || (int) $record->order_id !== 0) {
            wp_send_json_error(array('message' => __('File not found.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Ownership check: record must belong to the caller's batch
        $token = Studiou_WC_FPP_Upload::get_batch_token();
        if (!empty($token) && !empty($record->batch_token) && $token !== $record->batch_token) {
            wp_send_json_error(array('message' => __('Permission denied.', 'studiou-wc-free-photo-product')));
            return;
        }

        $variation = wc_get_product($variation_id);
        if (!$variation || $variation->get_type() !== 'variation') {
            wp_send_json_error(array('message' => __('Invalid variant.', 'studiou-wc-free-photo-product')));
            return;
        }
        $parent_id = $variation->get_parent_id();
        if (!Studiou_WC_FPP_Product::is_fpp_product($parent_id)) {
            wp_send_json_error(array('message' => __('Invalid product.', 'studiou-wc-free-photo-product')));
            return;
        }

        if (function_exists('wc_load_cart')) {
            wc_load_cart();
        }
        if (!WC()->cart) {
            wp_send_json_error(array('message' => __('Cart unavailable.', 'studiou-wc-free-photo-product')));
            return;
        }

        $variation_attrs = $variation->get_variation_attributes();
        $cart_item_data  = array('studiou_fpp_file_record_id' => (int) $file_record_id);

        $cart_key = WC()->cart->add_to_cart($parent_id, $quantity, $variation_id, $variation_attrs, $cart_item_data);
        if (!$cart_key) {
            // WC emits notices on failure — surface the first error if available
            $notices = function_exists('wc_get_notices') ? wc_get_notices('error') : array();
            $msg = __('Could not add to cart.', 'studiou-wc-free-photo-product');
            if (!empty($notices[0]['notice'])) {
                $msg = wp_strip_all_tags($notices[0]['notice']);
            }
            if (function_exists('wc_clear_notices')) {
                wc_clear_notices();
            }
            wp_send_json_error(array('message' => $msg));
            return;
        }

        wp_send_json_success(array(
            'cart_key'      => $cart_key,
            'overview_html' => $this->render_overview_html($parent_id),
        ));
    }

    /**
     * AJAX: remove one cart line (from the order-overview panel).
     * Does NOT delete the upload — the × on the upload card handles that.
     */
    public function ajax_remove_cart_line() {
        check_ajax_referer('studiou-wcfpp-front-nonce', 'nonce');

        $cart_item_key = isset($_POST['cart_item_key']) ? sanitize_text_field($_POST['cart_item_key']) : '';
        if (!$cart_item_key) {
            wp_send_json_error(array('message' => __('Invalid request.', 'studiou-wc-free-photo-product')));
            return;
        }

        if (function_exists('wc_load_cart')) {
            wc_load_cart();
        }
        if (!WC()->cart) {
            wp_send_json_error(array('message' => __('Cart unavailable.', 'studiou-wc-free-photo-product')));
            return;
        }

        $item = WC()->cart->get_cart_item($cart_item_key);
        if (!$item) {
            wp_send_json_error(array('message' => __('Cart line not found.', 'studiou-wc-free-photo-product')));
            return;
        }

        $product_id = (int) ($item['product_id'] ?? 0);
        WC()->cart->remove_cart_item($cart_item_key);

        wp_send_json_success(array(
            'overview_html' => $this->render_overview_html($product_id),
        ));
    }

    /**
     * Render the order-overview panel for the given product. Returns the HTML
     * so the JS can replace the in-page panel.
     */
    private function render_overview_html($product_id) {
        if (!$product_id) {
            return '';
        }
        $cart = WC()->cart;
        if (!$cart) {
            return '';
        }
        // Force a totals recalculation so the lines reflect the tier discount
        $cart->calculate_totals();

        ob_start();
        include STUDIOU_WCFPP_PLUGIN_DIR . 'views/single-product-order-overview.php';
        return ob_get_clean();
    }

    public function cart_item_thumbnail($thumbnail, $cart_item, $cart_item_key) {
        $url = $this->get_cart_item_thumb_url($cart_item);
        if ($url) {
            $alt = isset($cart_item['studiou_fpp_file_name']) ? esc_attr($cart_item['studiou_fpp_file_name']) : '';
            return '<img src="' . esc_url($url) . '" alt="' . $alt . '" class="attachment-woocommerce_thumbnail" />';
        }
        return $thumbnail;
    }

    /**
     * Hydrate each cart line with its own product instance carrying the uploaded image_id.
     *
     * Fires on session restore (both classic cart render and Store API block cart). Because the
     * product instance is cloned per line, setting `set_image_id()` only affects THIS line's
     * display — multiple cart lines sharing the same variation_id still render their own photos.
     *
     * Previous implementation hooked `woocommerce_product_get_image_id` which fires per-product
     * and couldn't tell which line was currently being rendered; when two lines shared a
     * variation it returned the first match for both, causing mismatched thumbs in block cart.
     */
    public function hydrate_cart_item_image($cart_item, $values, $cart_item_key) {
        if (empty($cart_item['studiou_fpp_attachment_id'])) {
            return $cart_item;
        }
        if (empty($cart_item['data']) || !is_object($cart_item['data'])) {
            return $cart_item;
        }
        if (!method_exists($cart_item['data'], 'set_image_id')) {
            return $cart_item;
        }
        $product = clone $cart_item['data'];
        $product->set_image_id((int) $cart_item['studiou_fpp_attachment_id']);
        $cart_item['data'] = $product;
        return $cart_item;
    }

    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 show_cart_item_photo_preview($cart_item, $cart_item_key) {
        $url = $this->get_cart_item_thumb_url($cart_item);
        if ($url) {
            echo '<div class="studiou-fpp-cart-preview">';
            echo '<img src="' . esc_url($url) . '" alt="' . esc_attr($cart_item['studiou_fpp_file_name'] ?? '') . '" />';
            echo '</div>';
        }
    }

    private function get_cart_item_thumb_url($cart_item) {
        // 1. Use stored URL from session (most reliable)
        if (!empty($cart_item['studiou_fpp_thumb_url'])) {
            return $cart_item['studiou_fpp_thumb_url'];
        }

        // 2. Try WP attachment lookup
        if (!empty($cart_item['studiou_fpp_attachment_id'])) {
            $att_id = (int) $cart_item['studiou_fpp_attachment_id'];
            $thumb = wp_get_attachment_image_src($att_id, 'thumbnail');
            if ($thumb) {
                return $thumb[0];
            }
            $url = wp_get_attachment_url($att_id);
            if ($url) {
                return $url;
            }
        }

        return '';
    }

    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']);
            $item->add_meta_data(__('Uploaded Photo', 'studiou-wc-free-photo-product'), $values['studiou_fpp_file_name']);
        }
        if (isset($values['studiou_fpp_thumb_url'])) {
            $item->add_meta_data('_studiou_fpp_thumb_url', $values['studiou_fpp_thumb_url']);
        }
    }

    public function link_files_to_order($order_id, $posted_data, $order) {
        $this->do_link_files($order);
    }

    /**
     * Block checkout fires this hook with only the $order parameter.
     */
    public function link_files_to_order_from_store_api($order) {
        $this->do_link_files($order);
    }

    /**
     * Fallback: runs on thank-you page to catch any missed linking.
     */
    public function link_files_to_order_fallback($order_id) {
        $order = wc_get_order($order_id);
        if ($order) {
            $this->do_link_files($order);
        }
    }

    private function do_link_files($order) {
        if (!$order) {
            return;
        }
        $order_id = $order->get_id();
        foreach ($order->get_items() as $item_id => $item) {
            $file_record_id = $item->get_meta('_studiou_fpp_file_record_id');
            if ($file_record_id) {
                // Only link if not already linked
                $record = $this->db->get_file_record((int) $file_record_id);
                if ($record && (int) $record->order_id === 0) {
                    $this->db->link_file_to_order((int) $file_record_id, $order_id, $item_id);
                }
            }
        }
    }

    public function admin_order_item_thumbnail($thumbnail, $item_id, $item) {
        // Try stored URL first
        $thumb_url = $item->get_meta('_studiou_fpp_thumb_url');
        if ($thumb_url) {
            return '<img src="' . esc_url($thumb_url) . '" alt="" class="wc-block-components-product-image" width="50" height="50" />';
        }

        // Fallback to attachment lookup
        $attachment_id = $item->get_meta('_studiou_fpp_attachment_id');
        if ($attachment_id) {
            $image = wp_get_attachment_image($attachment_id, 'thumbnail');
            if ($image) {
                return $image;
            }
            $url = wp_get_attachment_url($attachment_id);
            if ($url) {
                return '<img src="' . esc_url($url) . '" alt="" width="50" height="50" />';
            }
        }
        return $thumbnail;
    }

    public function admin_order_item_download_link($item_id, $item, $product) {
        $attachment_id = $item->get_meta('_studiou_fpp_attachment_id');
        if (!$attachment_id) {
            return;
        }

        $file_url = wp_get_attachment_url($attachment_id);
        $file_name = $item->get_meta('_studiou_fpp_file_name');
        if (!$file_url) {
            return;
        }

        $file_record_id = $item->get_meta('_studiou_fpp_file_record_id');

        // Build download URL that also marks file as downloaded
        $download_url = add_query_arg(array(
            'studiou_fpp_download_file' => 1,
            'file_record_id' => $file_record_id ?: 0,
            'attachment_id' => $attachment_id,
            '_wpnonce' => wp_create_nonce('studiou-fpp-download-file'),
        ), admin_url('admin.php'));

        echo '<p class="studiou-fpp-order-download">';
        echo '<a href="' . esc_url($download_url) . '" class="button button-small">';
        echo '<span class="dashicons dashicons-download" style="line-height:1.4;vertical-align:middle;"></span> ';
        echo esc_html__('Download uploaded photo', 'studiou-wc-free-photo-product');
        echo '</a>';
        if ($file_name) {
            echo ' <small>(' . esc_html($file_name) . ')</small>';
        }
        echo '</p>';
    }
}