<?php
/**
 * AKSRT Creator Revenue Settlement.
 *
 * Wires order-paid + non-shop paid content into the pre-existing revenue ledger
 * (`aksrt_revenue` table + AKSRT_Revenue service). This closes the deferred
 * "结算引擎" gap: the ledger, service and share-ratio settings already existed
 * but nothing credited creator revenue when an order was paid.
 *
 * Scope (kept intentionally narrow):
 * - Only shop-product orders and post-level paid content credit revenue.
 * - Share ratio comes from AKSRT_Settings::get_payment_revenue_settings().
 * - Buyer == author is skipped (no self-dealing).
 * - Idempotent per order_number via a guard row lookup.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

if (!class_exists('AKSRT_Creator_Revenue')) {

    class AKSRT_Creator_Revenue {

        private static ?AKSRT_Creator_Revenue $instance = null;

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

        public function init(): void {
            add_action('aksrt_order_paid', [$this, 'handle_order_paid'], 20, 2);
        }

        /**
         * Whether creator revenue settlement is enabled.
         */
        private function is_enabled(): bool {
            if (!class_exists('AKSRT_Revenue') || !class_exists('AKSRT_Settings')) {
                return false;
            }
            $settings = AKSRT_Settings::get_payment_revenue_settings();
            return !empty($settings['enabled']);
        }

        /**
         * Resolve share ratio (percentage 0-100) for a given product author.
         */
        private function resolve_share_ratio(int $author_id): float {
            $settings = AKSRT_Settings::get_payment_revenue_settings();
            $ratio = (float) ($settings['share_ratio'] ?? 0);

            // VIP-tier author overrides, if configured (>0 wins).
            if ($author_id > 0 && function_exists('aksrt_get_user_vip_level')) {
                $level = (int) aksrt_get_user_vip_level($author_id);
                if ($level === 1 && (float) ($settings['ratio_vip1'] ?? 0) > 0) {
                    $ratio = (float) $settings['ratio_vip1'];
                } elseif ($level >= 2 && (float) ($settings['ratio_vip2'] ?? 0) > 0) {
                    $ratio = (float) $settings['ratio_vip2'];
                }
            }

            return max(0.0, min(100.0, $ratio));
        }

        /**
         * Guard: has this order already been settled into revenue?
         */
        private function already_settled(string $order_number): bool {
            if ($order_number === '' || !class_exists('AKSRT_DB_Migrator')) {
                return false;
            }
            global $wpdb;
            $table = AKSRT_DB_Migrator::table('revenue');
            if ($table === '') {
                return false;
            }
            $count = (int) $wpdb->get_var($wpdb->prepare(
                "SELECT COUNT(*) FROM {$table} WHERE order_number = %s AND type = %s",
                $order_number,
                'order'
            ));
            return $count > 0;
        }

        /**
         * aksrt_order_paid listener: credit creators their share.
         *
         * @param string $order_number Paid order number.
         * @param array  $order        Order row (status=paid).
         */
        public function handle_order_paid(string $order_number, array $order): void {
            if (!$this->is_enabled() || $order_number === '') {
                return;
            }
            if ($this->already_settled($order_number)) {
                return;
            }

            $buyer_id = (int) ($order['user_id'] ?? 0);

            $items = [];
            if (class_exists('AKSRT_Shop')) {
                $shop = AKSRT_Shop::get_instance();
                if (method_exists($shop, 'get_order_items')) {
                    $items = (array) $shop->get_order_items($order_number);
                }
            }

            if (empty($items)) {
                return; // Only structured shop-product orders settle creator revenue here.
            }

            $revenue = AKSRT_Revenue::get_instance();

            foreach ($items as $item) {
                $product_id = (int) ($item['product_id'] ?? 0);
                $pay_price  = (float) ($item['pay_price'] ?? $item['total_price'] ?? 0);
                if ($product_id <= 0 || $pay_price <= 0) {
                    continue;
                }

                $author_id = (int) get_post_field('post_author', $product_id);
                if ($author_id <= 0 || $author_id === $buyer_id) {
                    continue; // No author, or buyer is the author.
                }

                $ratio  = $this->resolve_share_ratio($author_id);
                if ($ratio <= 0) {
                    continue;
                }

                $amount = round($pay_price * $ratio / 100, 2);
                if ($amount <= 0) {
                    continue;
                }

                $revenue->add($author_id, $amount, $order_number, 'order');
            }
        }
    }
}