<?php

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

class Twokcs_Plugin
{
    /**
     * @var Twokcs_Authenticator
     */
    private $authenticator;

    /**
     * @var Twokcs_Products_Exporter
     */
    private $exporter;

    /**
     * @var Twokcs_Taxonomy_Exporter
     */
    private $taxonomy_exporter;

    /**
     * @var Twokcs_Variations_Exporter
     */
    private $variations_exporter;

    /**
     * @var Twokcs_Orders_Handler
     */
    private $orders_handler;

    public function __construct()
    {
        $this->authenticator         = new Twokcs_Authenticator();
        $this->exporter              = new Twokcs_Products_Exporter();
        $this->taxonomy_exporter     = new Twokcs_Taxonomy_Exporter();
        $this->variations_exporter   = new Twokcs_Variations_Exporter();
        $this->orders_handler        = new Twokcs_Orders_Handler();

        if (strpos(site_url(), 'localhost') !== false) {
            add_filter('http_request_args', [$this, 'allow_localhost_http_requests']);
        }

        add_action('rest_api_init', [$this, 'register_routes']);
        add_filter('rest_authentication_errors', [$this, 'check_rest_auth_error'], PHP_INT_MAX);
        add_filter('woocommerce_rest_check_permissions', [$this, 'check_wc_permission']);
        add_filter('woocommerce_rest_prepare_product_object', [$this, 'apply_discount_rules_pricing'], 10, 3);
        add_filter('woocommerce_rest_prepare_product_variation_object', [$this, 'apply_discount_rules_pricing'], 10, 3);
    }

    /**
     * Allow outbound HTTP requests on localhost during development.
     *
     * @param array $args HTTP request arguments.
     * @return array
     */
    public function allow_localhost_http_requests($args)
    {
        $args['reject_unsafe_urls'] = false;

        return $args;
    }

    /**
     * Register Twokcs REST API routes.
     */
    public function register_routes()
    {
        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/version', [
            'methods'             => 'GET',
            'callback'            => [$this, 'api_version'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/products', [
            'methods'             => 'GET',
            'callback'            => [$this, 'products_list'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/categories', [
            'methods'             => 'GET',
            'callback'            => [$this, 'categories_list'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/attributes', [
            'methods'             => 'GET',
            'callback'            => [$this, 'attributes_list'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/attribute-terms', [
            'methods'             => 'GET',
            'callback'            => [$this, 'attribute_terms_list'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/variants', [
            'methods'             => 'GET',
            'callback'            => [$this, 'variants_list'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/variant', [
            'methods'             => 'GET',
            'callback'            => [$this, 'variant_by_id'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/orders', [
            'methods'             => 'POST',
            'callback'            => [$this, 'orders_create'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/order', [
            'methods'             => 'GET',
            'callback'            => [$this, 'order_track'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/order/cancel', [
            'methods'             => 'POST',
            'callback'            => [$this, 'order_cancel'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(Twokcs_Constants::REST_NAMESPACE, '/order/update', [
            'methods'             => 'POST',
            'callback'            => [$this, 'order_update'],
            'permission_callback' => [$this, 'check_permission'],
        ]);
    }

    /**
     * Permission callback for Twokcs REST routes.
     *
     * @return true|WP_Error
     */
    public function check_permission()
    {
        return $this->authenticator->verify();
    }

    /**
     * Bypass default REST authentication when Twokcs auth succeeds.
     *
     * @param WP_Error|null $result Existing authentication error.
     * @return WP_Error|null
     */
    public function check_rest_auth_error($result)
    {
        if ($this->authenticator->verify() === true) {
            return null;
        }

        return $result;
    }

    /**
     * Grant WooCommerce REST permissions when Twokcs auth succeeds.
     *
     * @param bool $permission Existing permission result.
     * @return bool
     */
    public function check_wc_permission($permission)
    {
        if ($this->authenticator->verify() === true) {
            return true;
        }

        return $permission;
    }

    /**
     * Apply Discount Rules for WooCommerce pricing to REST responses.
     *
     * @param WP_REST_Response $response REST response.
     * @param WC_Product       $object   Product or variation object.
     * @param WP_REST_Request  $request  Request object.
     * @return WP_REST_Response
     */
    public function apply_discount_rules_pricing($response, $object, $request)
    {
        if (class_exists('Wdr\App\Controllers\ManageDiscount')) {
            $discount = new \Wdr\App\Controllers\ManageDiscount();
            $prices   = $discount->calculateInitialAndDiscountedPrice($object, 1);

            if (isset($prices['initial_price'])) {
                $response->data['regular_price'] = $prices['initial_price'];
            }

            if (isset($prices['discounted_price'])) {
                $response->data['sale_price'] = $prices['discounted_price'];
                $response->data['price']      = $prices['discounted_price'];
            }
        }

        return $response;
    }

    /**
     * Return the plugin version.
     *
     * @return WP_REST_Response
     */
    public function api_version()
    {
        return new WP_REST_Response(['version' => Twokcs_Constants::VERSION], 200);
    }

    /**
     * Export paginated products.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function products_list(WP_REST_Request $request)
    {
        return $this->exporter->export($request);
    }

    /**
     * Export paginated product categories.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function categories_list(WP_REST_Request $request)
    {
        return $this->taxonomy_exporter->export_categories($request);
    }

    /**
     * Export paginated product attributes.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function attributes_list(WP_REST_Request $request)
    {
        return $this->taxonomy_exporter->export_attributes($request);
    }

    /**
     * Export paginated attribute terms.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function attribute_terms_list(WP_REST_Request $request)
    {
        return $this->taxonomy_exporter->export_attribute_terms($request);
    }

    /**
     * Export variants by product_ids or ids query parameter.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function variants_list(WP_REST_Request $request)
    {
        return $this->variations_exporter->export($request);
    }

    /**
     * Export a single variant by ID.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function variant_by_id(WP_REST_Request $request)
    {
        return $this->variations_exporter->export_by_id($request);
    }

    /**
     * Create a WooCommerce order.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function orders_create(WP_REST_Request $request)
    {
        return $this->orders_handler->create($request);
    }

    /**
     * List WooCommerce orders with optional id, external_order_id, and status filters.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function order_track(WP_REST_Request $request)
    {
        return $this->orders_handler->track($request);
    }

    /**
     * Cancel a 2khat WooCommerce order.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function order_cancel(WP_REST_Request $request)
    {
        return $this->orders_handler->cancel($request);
    }

    /**
     * Update line items (quantities, additions, removals) of a 2khat order.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response|WP_Error
     */
    public function order_update(WP_REST_Request $request)
    {
        return $this->orders_handler->update($request);
    }
}