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

class Studiou_WC_FPP_Cart {

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

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

        // 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);

        // Override product image for block cart (Store API) — returns uploaded photo as product image
        add_filter('woocommerce_product_get_image_id', array($this, 'override_product_image_for_cart'), 10, 2);
        add_filter('woocommerce_product_variation_get_image_id', array($this, 'override_product_image_for_cart'), 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 (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;
            }
        }

        // Read file data from WC session
        if (!WC()->session) {
            return $cart_item_data;
        }

        $attachment_id = WC()->session->get('studiou_fpp_attachment_id');
        $file_record_id = WC()->session->get('studiou_fpp_file_record_id');
        $file_name = WC()->session->get('studiou_fpp_file_name');
        $thumb_url = WC()->session->get('studiou_fpp_thumb_url');

        if (!$attachment_id || !$file_record_id) {
            return $cart_item_data;
        }

        // Verify the file record exists
        $record = $this->db->get_file_record($file_record_id);
        if (!$record || (int) $record->attachment_id !== (int) $attachment_id) {
            return $cart_item_data;
        }

        $cart_item_data['studiou_fpp_attachment_id'] = $attachment_id;
        $cart_item_data['studiou_fpp_file_record_id'] = $file_record_id;
        $cart_item_data['studiou_fpp_file_name'] = $file_name ?: $record->file_name;
        $cart_item_data['studiou_fpp_thumb_url'] = $thumb_url ?: '';

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

        // Keep session data so the same photo can be used for multiple variants
        return $cart_item_data;
    }

    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;
    }

    /**
     * Override product/variation image_id when rendered in cart context (block cart / Store API).
     * Returns the uploaded photo attachment_id so the block cart shows it instead of placeholder.
     */
    public function override_product_image_for_cart($image_id, $product) {
        if (!WC()->cart) {
            return $image_id;
        }

        $product_id = $product->get_id();

        foreach (WC()->cart->get_cart() as $cart_item) {
            if (empty($cart_item['studiou_fpp_attachment_id'])) {
                continue;
            }

            $match = false;
            if (isset($cart_item['variation_id']) && $cart_item['variation_id'] == $product_id) {
                $match = true;
            } elseif ($cart_item['product_id'] == $product_id) {
                $match = true;
            }

            if ($match) {
                return (int) $cart_item['studiou_fpp_attachment_id'];
            }
        }

        return $image_id;
    }

    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>';
    }
}