<?php
/**
 * @package AKSRT
 */

namespace AKSRT\Payment;

defined('ABSPATH') || exit;

class Order {

    public const STATUS_PENDING   = \AKSRT\Core\DomainModel::ORDER_STATUS_PENDING;
    public const STATUS_PAID      = \AKSRT\Core\DomainModel::ORDER_STATUS_PAID;
    public const STATUS_REFUNDING = \AKSRT\Core\DomainModel::ORDER_STATUS_REFUNDING;
    public const STATUS_REFUNDED  = \AKSRT\Core\DomainModel::ORDER_STATUS_REFUNDED;
    public const STATUS_CLOSED    = \AKSRT\Core\DomainModel::ORDER_STATUS_CLOSED;

    private static $instance = null;

    public static function get_instance(): self {
        if (null === self::$instance) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    public static function get_valid_statuses(): array {
        return \AKSRT\Core\DomainModel::order_status_labels();
    }

    public static function can_transition(string $from, string $to): bool {
        return \AKSRT\Core\DomainModel::can_transition_order_status($from, $to);
    }

    public function init(): void {
        add_action('wp_ajax_aksrt_order_list', [$this, 'ajax_list']);
        add_action('wp_ajax_aksrt_order_update_status', [$this, 'ajax_update_status']);
        add_action('wp_ajax_aksrt_order_stats', [$this, 'ajax_stats']);
    }

	public function create(int $user_id, string $product_type, int $product_id, string $amount, string $currency = 'CNY'): string {
        // Guest content orders may use user_id=0 (legacy pay_no_logged_in).
		if ($user_id < 0 || $product_id < 0) {
            return '';
        }

        return $this->repo()->create([
            'user_id' => $user_id,
            'product_type' => sanitize_key($product_type),
            'product_id' => $product_id,
            'amount' => $amount,
            'currency' => sanitize_key($currency),
            'status' => self::STATUS_PENDING,
        ]);
    }

    public function get(string $order_number): ?array {
        return $this->repo()->get($order_number);
    }

    public function get_user_orders(int $user_id, array $args = []): array {
        return $this->repo()->get_user_orders($user_id, $args);
    }

    public function update_status(string $order_number, string $new_status, array $extra = []): bool {
        return $this->repo()->update_status($order_number, $new_status, $extra);
    }

    public function get_stats(int $user_id = 0): array {
        return $this->repo()->get_stats($user_id);
    }

    public function has_paid_access(int $user_id, string $product_type, int $product_id): bool {
        return $this->repo()->has_paid_access($user_id, $product_type, $product_id);
    }

    public function get_valid_vip_order(int $user_id): ?array {
        return $this->repo()->get_valid_vip_order($user_id);
    }

    public function ajax_list(): void {
        check_ajax_referer('aksrt_public_nonce', 'nonce');
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => __('权限不足', 'aksrt')]);
        }

        $status = sanitize_key((string) ($_GET['status'] ?? ''));
        $search = sanitize_text_field((string) ($_GET['search'] ?? ''));
        $limit = max(1, min(100, (int) ($_GET['limit'] ?? 20)));
        $offset = max(0, (int) ($_GET['offset'] ?? 0));

        $orders = $this->repo()->get_orders_admin([
            'status' => $status,
            'limit' => $limit,
            'offset' => $offset,
        ], $search);

        wp_send_json_success([
            'orders' => $orders,
            'stats' => $this->get_stats(),
            'total' => $this->repo()->get_orders_count(['status' => $status], $search),
        ]);
    }

    public function ajax_update_status(): void {
        check_ajax_referer('aksrt_public_nonce', 'nonce');
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => __('权限不足', 'aksrt')]);
        }

        $order_number = sanitize_text_field((string) ($_POST['order_number'] ?? ''));
        $new_status = sanitize_key((string) ($_POST['status'] ?? ''));
        $note = sanitize_textarea_field((string) ($_POST['note'] ?? ''));

        if ($order_number === '' || $new_status === '') {
            wp_send_json_error(['message' => __('参数无效', 'aksrt')]);
        }

        if ($this->update_status($order_number, $new_status, ['note' => $note])) {
            wp_send_json_success(['message' => __('订单状态已更新', 'aksrt')]);
        }

        wp_send_json_error(['message' => __('更新失败', 'aksrt')]);
    }

    public function ajax_stats(): void {
        check_ajax_referer('aksrt_public_nonce', 'nonce');
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => __('权限不足', 'aksrt')]);
        }

        wp_send_json_success($this->get_stats());
    }

    private function repo(): OrderRepository {
        return OrderRepository::get_instance();
    }
}