<?php
/**
 * 订单与支付渠道交易号（out_trade_no）的映射：meta 合并、按交易号反查订单、重复支付时分配新交易号。
 *
 * 作为 flat sibling trait 被 OrderRepository 使用（PSR-4：trait 必须与宿主类同目录）。
 *
 * @package AKSRT
 */

namespace AKSRT\Payment;

defined('ABSPATH') || exit;

trait OrderRepositoryAttempts {

    /**
     * Merge keys into the order note JSON payload (meta_payload).
     *
     * @param array<string,mixed> $patch
     */
    public function merge_meta(string $order_number, array $patch): bool {
        global $wpdb;

        $order = $this->get($order_number);
        if (!$order) {
            return false;
        }

        $meta = is_array($order['meta_payload'] ?? null) ? $order['meta_payload'] : [];
        foreach ($patch as $key => $value) {
            $meta[(string) $key] = $value;
        }

        $encoded = wp_json_encode($meta, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        if (!is_string($encoded)) {
            return false;
        }

        $updated = $wpdb->update(
            $this->table(),
            ['note' => $encoded],
            ['order_number' => $order_number],
            ['%s'],
            ['%s']
        );

        return $updated !== false;
    }

    /**
     * Resolve a local order from a provider out_trade_no (base or attempt-suffixed).
     *
     * The authoritative mapping is the order's own meta (provider_out_trade_no /
     * provider_out_trade_nos); the prefix heuristic is only a fallback and must
     * never be the sole resolver, otherwise a truncated attempt number would
     * strand a real payment.
     */
    public function resolve_by_out_trade_no(string $out_trade_no): ?array {
        global $wpdb;

        $out_trade_no = sanitize_text_field($out_trade_no);
        if ($out_trade_no === '') {
            return null;
        }

        $direct = $this->get($out_trade_no);
        if ($direct) {
            return $direct;
        }

        // Authoritative: the attempt number was recorded in the order note JSON.
        $needle = '"provider_out_trade_no":"' . $out_trade_no . '"';
        $row = $wpdb->get_row(
            $wpdb->prepare(
                "SELECT * FROM {$this->table()} WHERE note LIKE %s ORDER BY id DESC LIMIT 1",
                '%' . $wpdb->esc_like($needle) . '%'
            ),
            ARRAY_A
        );
        if (is_array($row)) {
            return $this->expire_order_if_due($this->normalize_row($row));
        }

        // Superseded attempts stay in the history array.
        $history_needle = '"' . $out_trade_no . '"';
        $row = $wpdb->get_row(
            $wpdb->prepare(
                "SELECT * FROM {$this->table()}
                 WHERE note LIKE %s AND note LIKE %s
                 ORDER BY id DESC LIMIT 1",
                '%' . $wpdb->esc_like('"provider_out_trade_nos"') . '%',
                '%' . $wpdb->esc_like($history_needle) . '%'
            ),
            ARRAY_A
        );
        if (is_array($row)) {
            return $this->expire_order_if_due($this->normalize_row($row));
        }

        // Last resort: {order_number}P{n} prefix heuristic.
        if (preg_match('/^(.+)P([0-9]{1,3})$/', $out_trade_no, $m)) {
            $base = $this->get($m[1]);
            if ($base) {
                return $base;
            }
        }

        return null;
    }

    /**
     * Provider out_trade_no currently bound to this order (falls back to order_number).
     *
     * @param array<string,mixed> $order
     */
    public static function provider_out_trade_no(array $order): string {
        $meta = is_array($order['meta_payload'] ?? null) ? $order['meta_payload'] : [];
        $out  = sanitize_text_field((string) ($meta['provider_out_trade_no'] ?? ''));
        if ($out !== '') {
            return $out;
        }
        return sanitize_text_field((string) ($order['order_number'] ?? ''));
    }

    /**
     * Allocate a new provider out_trade_no for a payment attempt.
     * First attempt uses bare order_number; later attempts append Pn (WeChat limit 32).
     *
     * @return array{out_trade_no:string,attempt:int,previous:string}|null
     */
    public function allocate_payment_attempt(string $order_number): ?array {
        $order = $this->get($order_number);
        if (!$order) {
            return null;
        }

        $meta     = is_array($order['meta_payload'] ?? null) ? $order['meta_payload'] : [];
        $previous = sanitize_text_field((string) ($meta['provider_out_trade_no'] ?? ''));
        $history  = is_array($meta['provider_out_trade_nos'] ?? null) ? $meta['provider_out_trade_nos'] : [];

        // First provider submission keeps the bare order number.
        // Re-pay (provider_out_trade_no already set) always mints a new suffix so
        // WeChat/Alipay/Epay accept the order when amount/subject/notify changed.
        if ($previous === '') {
            $attempt = 1;
            $out     = $order_number;
        } else {
            $attempt = max(1, (int) ($meta['pay_attempt'] ?? 1)) + 1;
            $suffix  = 'P' . $attempt;
            $base    = $order_number;
            if (strlen($base) + strlen($suffix) > 32) {
                $base = substr($base, 0, 32 - strlen($suffix));
            }
            $out = $base . $suffix;
            if ($previous !== '' && !in_array($previous, $history, true)) {
                $history[] = $previous;
            }
        }

        if (!in_array($out, $history, true)) {
            $history[] = $out;
        }
        if (count($history) > 20) {
            $history = array_slice($history, -20);
        }

        $ok = $this->merge_meta($order_number, [
            'pay_attempt'            => $attempt,
            'provider_out_trade_no'  => $out,
            'provider_out_trade_nos' => array_values($history),
        ]);
        if (!$ok) {
            return null;
        }

        return [
            'out_trade_no' => $out,
            'attempt'      => $attempt,
            'previous'     => $previous,
        ];
    }
}