<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class ACAI_Product_Sync
{
    private $last_product_id = null;
    private $last_action = null;

    public function __construct()
    {
        add_action('woocommerce_update_product', array($this, 'handle_product_change'), 10, 2);
        add_action('before_delete_post', array($this, 'handle_product_deletion'), 10, 1);
        add_action('wp_trash_post', array($this, 'handle_product_trash'), 10, 1);
        add_action('untrashed_post', array($this, 'handle_product_untrash'), 10, 1);
    }

    public function handle_product_change($product_id, $product)
    {
        $current_action = current_filter();
        if ($this->should_skip_operation($product_id, $current_action)) return;

        if (!$product) return;

        $product_data = $this->get_product_data($product);

        $this->send_to_external_system(array(
            'operation' => 'updateOrCreate',
            'product' => $product_data,
        ));
    }

    public function handle_product_deletion($post_id)
    {
        if (get_post_type($post_id) !== 'product') return;

        if ($this->should_skip_operation($post_id, 'delete')) return;

        $product_data = array(
            'id' => (string) $post_id
        );

        $this->send_to_external_system(array(
            'operation' => 'delete',
            'product' => $product_data,
        ));
    }

    public function handle_product_trash($post_id)
    {
        if (get_post_type($post_id) !== 'product') return;

        if ($this->should_skip_operation($post_id, 'trash')) return;

        $product = wc_get_product($post_id);
        if (!$product) return;

        $product_data = $this->get_product_data($product);
        $product_data['visible'] = false;

        $this->send_to_external_system(array(
            'operation' => 'updateOrCreate',
            'product' => $product_data,
        ));
    }

    public function handle_product_untrash($post_id)
    {
        if (get_post_type($post_id) !== 'product') return;

        if ($this->should_skip_operation($post_id, 'untrash')) return;

        $product = wc_get_product($post_id);
        if (!$product) return;

        $product_data = $this->get_product_data($product);
        $product_data['visible'] = $product->get_catalog_visibility() !== 'hidden';

        $this->send_to_external_system(array(
            'operation' => 'updateOrCreate',
            'product' => $product_data,
        ));
    }

    private function should_skip_operation($product_id, $action)
    {
        if ($this->last_product_id === $product_id && $this->last_action === $action) {
            return true;
        }

        $this->last_product_id = $product_id;
        $this->last_action = $action;

        return false;
    }

    private function get_product_data($product)
    {
        $image_id = $product->get_image_id();
        $image_src = wp_get_attachment_image_src($image_id, 'full');
        $image_url = $image_src ? $image_src[0] : null;

        $is_published = $product->get_status() === 'publish';

        return array(
            'id' => (string) $product->get_id(),
            'title' => $product->get_name(),
            'price' => (float) $product->get_price(),
            'imageUrl' => $image_url,
            'inStock' => $product->is_in_stock(),
            'visible' => $is_published && $product->get_catalog_visibility() !== 'hidden'
        );
    }

    private function send_to_external_system($data)
    {
        $activation_key = get_option('a2cai_activation_key');

        if (!$activation_key) {
            return;
        }

        $endpoint = ACAI_API_BASE_URL . '/products';
        $response = wp_remote_post($endpoint, array(
            'body' => json_encode($data),
            'headers' => array(
                'Content-Type' => 'application/json',
                'Authorization' => 'Bearer ' . $activation_key
            ),
        ));

        if (is_wp_error($response)) {
            // Connection error - silently fail.
        }
    }

    private function verify_token($token)
    {
        if (empty($token)) {
            return false;
        }

        $stored_key = get_option('a2cai_activation_key');
        return hash_equals($stored_key, $token);
    }
}

new ACAI_Product_Sync();