<?php

namespace App\Services\Payments;

use App\Models\Payments\GcPaymentAttempt;
use App\Providers\Danal\Clients\DanalCpcgiClient;
use App\Providers\Danal\DanalConfig;
use App\Providers\Danal\Gateways\PhoneGateway;
use App\Repositories\Payments\GcPinOrderRepository;
use Illuminate\Support\Facades\DB;

final class PaymentCancelService
{
    public function __construct(
        private readonly DanalConfig $danalCfg,
        private readonly DanalCpcgiClient $cpcgi,
        private readonly PhoneGateway $phoneGateway,
        private readonly GcPinOrderRepository $orders,
    ) {}

    /**
     * 결제완료 후 취소 (핀 오픈 전만)
     * - cancel_status/로그 저장 포함
     */
    public function cancelByAttempt(int $attemptId, array $actor, string $reason, bool $pinsOpened): array
    {
        return DB::transaction(function () use ($attemptId, $actor, $reason, $pinsOpened) {

            /** @var GcPaymentAttempt|null $attempt */
            $attempt = GcPaymentAttempt::query()->whereKey($attemptId)->lockForUpdate()->first();
            if (!$attempt) return ['ok'=>false, 'message'=>'결제내역을 찾을 수 없습니다.'];

            $order = $this->orders->findByOidForUpdate((string)$attempt->oid);
            if (!$order) return ['ok'=>false, 'message'=>'주문을 찾을 수 없습니다.'];

            // 권한: user면 소유자만
            if (($actor['type'] ?? 'user') === 'user') {
                if ((int)$attempt->mem_no !== (int)($actor['mem_no'] ?? 0)) {
                    return ['ok'=>false, 'message'=>'권한이 없습니다.'];
                }
            }

            // 상태 체크
            if ((string)$attempt->status !== 'paid' || (string)$order->stat_pay !== 'p') {
                return ['ok'=>false, 'message'=>'취소 가능한 상태가 아닙니다.'];
            }

            // 이미 성공 취소
            if ((string)($attempt->cancel_status ?? 'none') === 'success' || (string)($order->cancel_status ?? 'none') === 'success') {
                return ['ok'=>false, 'message'=>'이미 취소 완료된 결제입니다.'];
            }

            // 핀 오픈 전 조건 (이번 범위에서 “핀 반납” 제외지만, 오픈 후 취소는 금지)
            if ($pinsOpened) {
                return ['ok'=>false, 'message'=>'핀을 확인한 이후에는 취소할 수 없습니다.'];
            }

            $tid = (string)($attempt->pg_tid ?: $order->pg_tid);
            $amount = (int)$order->pay_money;
            if ($tid === '' || $amount <= 0) return ['ok'=>false, 'message'=>'취소에 필요한 거래정보가 부족합니다.'];

            // 1) requested 상태 선반영
            $now = now();
            $attempt->cancel_status = 'requested';
            $attempt->cancel_requested_at = $now;
            $attempt->cancel_last_msg = null;
            $attempt->cancel_last_code = null;
            $attempt->save();

            $order->cancel_status = 'requested';
            $order->cancel_requested_at = $now;
            $order->cancel_reason = $reason;
            $order->save();

            // 2) PG 취소 호출
            $payMethod = (string)$attempt->pay_method;
            $req = [];
            $res = [];
            $ok = false;
            $code = null;
            $msg = null;

            try {
                if ($payMethod === 'card') {
                    $cardKind = (string)($attempt->card_kind ?: 'general');
                    $cfg = $this->danalCfg->card($cardKind);

                    $req = [
                        'TID' => $tid,
                        'AMOUNT' => (string)$amount,
                        'CANCELTYPE' => 'C',
                        'CANCELREQUESTER' => $this->requesterLabel($actor),
                        'CANCELDESC' => $reason ?: '사용자 요청',
                        'TXTYPE' => 'CANCEL',
                        'SERVICETYPE' => 'DANALCARD',
                    ];
                    $res = $this->cpcgi->call($cfg['url'], $cfg['cpid'], $req, $cfg['key'], $cfg['iv']);

                    $code = (string)($res['RETURNCODE'] ?? '');
                    $msg  = (string)($res['RETURNMSG'] ?? '');
                    $ok = ($code === '0000');

                } elseif ($payMethod === 'wire') {
                    $cfg = $this->danalCfg->wiretransfer();

                    $req = [
                        'TID' => $tid,
                        'AMOUNT' => (string)$amount,
                        'CANCELTYPE' => 'C',
                        'CANCELREQUESTER' => $this->requesterLabel($actor),
                        'CANCELDESC' => $reason ?: '사용자 요청',
                        'TXTYPE' => 'CANCEL',
                        'SERVICETYPE' => 'WIRETRANSFER',
                    ];
                    $res = $this->cpcgi->call((string)$cfg['tx_url'], (string)$cfg['cpid'], $req, (string)$cfg['key'], (string)$cfg['iv']);

                    $code = (string)($res['RETURNCODE'] ?? '');
                    $msg  = (string)($res['RETURNMSG'] ?? '');
                    $ok = ($code === '0000');

                } elseif ($payMethod === 'phone') {
                    $mode = $this->resolvePhoneModeFromAttempt($attempt->request_payload);
                    $out = $this->phoneGateway->billCancel($mode, $tid); // (수정: PhoneGateway에 메서드 추가 필요)
                    $req = $out['req'] ?? [];
                    $res = $out['res'] ?? [];

                    $code = (string)($res['Result'] ?? '');
                    $msg  = (string)($res['ErrMsg'] ?? '');
                    $ok = ($code === '0');

                } else {
                    $code = 'METHOD';
                    $msg = '지원하지 않는 결제수단입니다.';
                    $ok = false;
                }

            } catch (\Throwable $e) {
                $code = $code ?: 'EX';
                $msg = $msg ?: ('취소 처리 중 오류: ' . $e->getMessage());
                $ok = false;
            }

            // 3) 로그 저장 (req/res 전문)
            $logId = DB::table('gc_payment_cancel_logs')->insertGetId([
                'attempt_id' => (int)$attempt->id,
                'order_id' => (int)$order->id,
                'mem_no' => (int)$attempt->mem_no,
                'provider' => (string)($attempt->provider ?: 'danal'),
                'pay_method' => $payMethod,
                'tid' => $tid,
                'amount' => $amount,
                'cancel_type' => 'C',
                'status' => $ok ? 'success' : 'failed',
                'requester_type' => (string)($actor['type'] ?? 'user'),
                'requester_id' => (int)($actor['id'] ?? 0) ?: null,
                'reason' => $reason,
                'req_payload' => json_encode($req, JSON_UNESCAPED_UNICODE),
                'res_payload' => json_encode($res, JSON_UNESCAPED_UNICODE),
                'result_code' => $code,
                'result_msg' => $msg,
                'requested_at' => $now,
                'done_at' => now(),
                'created_at' => now(),
                'updated_at' => now(),
            ]);

            // 4) 결과 반영 (상태값 변경 + 요약 저장)
            if ($ok) {
                $attempt->status = 'cancelled';
                $attempt->cancel_status = 'success';
                $attempt->cancel_done_at = now();
                $attempt->cancel_last_code = $code;
                $attempt->cancel_last_msg  = $msg;
                $attempt->save();

                $order->stat_pay = 'c';
                $order->cancelled_at = now();
                $order->cancel_status = 'success';
                $order->cancel_done_at = now();
                $order->cancel_last_code = $code;
                $order->cancel_last_msg  = $msg;
                $order->cancel_reason = $reason;

                // ret_data에 “취소 요약”만 append (전문은 logs 테이블)
                $ret = (array)($order->ret_data ?? []);
                $ret['cancel_last'] = [
                    'log_id' => (int)$logId,
                    'method' => $payMethod,
                    'tid' => $tid,
                    'code' => $code,
                    'msg'  => $msg,
                    'at'   => now()->toDateTimeString(),
                ];
                $order->ret_data = $ret;
                $order->save();

                return ['ok'=>true, 'message'=>'결제가 취소되었습니다.', 'meta'=>['log_id'=>$logId]];
            }

            // 실패: status는 paid 유지, cancel_status만 failed
            $attempt->cancel_status = 'failed';
            $attempt->cancel_done_at = now();
            $attempt->cancel_last_code = (string)$code;
            $attempt->cancel_last_msg  = (string)$msg;
            $attempt->save();

            $order->cancel_status = 'failed';
            $order->cancel_done_at = now();
            $order->cancel_last_code = (string)$code;
            $order->cancel_last_msg  = (string)$msg;
            $order->save();

            return ['ok'=>false, 'message'=>($msg ?: '취소 실패'), 'meta'=>['code'=>$code]];
        });
    }

    private function requesterLabel(array $actor): string
    {
        $t = (string)($actor['type'] ?? 'user');
        $id = (int)($actor['id'] ?? 0);
        if ($t === 'admin') return "admin:{$id}";
        if ($t === 'system') return "system:{$id}";
        return "user:" . (int)($actor['mem_no'] ?? $id);
    }

    private function resolvePhoneModeFromAttempt($requestPayload): string
    {
        // request_payload가 array/json/string 어떤 형태든 대응
        $arr = [];
        if (is_array($requestPayload)) $arr = $requestPayload;
        elseif (is_string($requestPayload) && trim($requestPayload) !== '') {
            $tmp = json_decode($requestPayload, true);
            if (is_array($tmp)) $arr = $tmp;
        }

        $id = (string)($arr['ID'] ?? '');
        $prod = (string)config('danal.phone.prod.cpid', '');
        $dev  = (string)config('danal.phone.dev.cpid', '');

        if ($id !== '' && $dev !== '' && $id === $dev) return 'dev';
        if ($id !== '' && $prod !== '' && $id === $prod) return 'prod';

        return (string)config('danal.phone.default_mode', 'prod');
    }
}