<?php

namespace App\Services;

use App\Models\Customer;
use App\Models\PargarSyncLog;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;
use Rooyesh\Wallet\interfaces\TransactionInterface;
use Rooyesh\Wallet\interfaces\WalletInterface;

/**
 * اعمال اسناد/ماندهٔ ورودی پرگار روی کیف اپ.
 *
 * دکمهٔ ادمین فقط مانده (mande) را یک‌بار تنظیم می‌کند.
 * اسناد جدید از webhook با اثرانگشت یکتا اعمال می‌شوند — بدون replay انبوه لاگ‌های قدیمی.
 */
class PargarInboundWalletService
{
    public const TX_TYPE_PARGAR = 22;

    /** @var array<string, true> */
    private array $seenFingerprints = [];

    public function __construct(
        private readonly PargarSyncService $sync,
        private readonly WalletBroadcastService $walletBroadcast
    ) {
    }

    /**
     * @param  array<string, mixed>  $data
     * @return array{applied: int, skipped: int, errors: list<string>, logs: list<int>}
     */
    public function applyDocuments(Customer $customer, array $data, bool $broadcast = true): array
    {
        $transactions = is_array($data['transactions'] ?? null) ? $data['transactions'] : [];
        $accountId = trim((string) ($data['accountId'] ?? ''));

        $result = [
            'applied' => 0,
            'skipped' => 0,
            'errors' => [],
            'logs' => [],
        ];

        if ($transactions === []) {
            return $result;
        }

        $lock = Cache::lock('pargar-wallet-apply:'.$customer->id, 60);
        if (! $lock->get()) {
            $result['errors'][] = 'همگام‌سازی دیگری برای این مشتری در حال اجراست';

            return $result;
        }

        try {
            $walletApplied = false;

            foreach ($transactions as $tx) {
                if (! is_array($tx)) {
                    continue;
                }

                $fingerprint = $this->transactionFingerprint($accountId, $tx);
                if ($fingerprint === '' || $this->isFingerprintApplied($fingerprint)) {
                    $result['skipped']++;
                    continue;
                }

                // علامت در حافظه تا در همین درخواست دوباره نخورد
                $this->seenFingerprints[$fingerprint] = true;

                $goldDelta = $this->transactionGoldDelta($tx);
                $rialDelta = $this->transactionRialDelta($tx);

                if (abs($goldDelta) < 0.01 && abs($rialDelta) < 1) {
                    $this->recordProcessedFingerprint($customer, $fingerprint, $accountId, $tx, false, 'zero_amount');
                    $result['skipped']++;
                    continue;
                }

                if ($this->isEchoOfRecentOutbound((int) $customer->id, $goldDelta, $rialDelta)) {
                    $this->recordProcessedFingerprint($customer, $fingerprint, $accountId, $tx, false, 'echo_outbound');
                    $result['skipped']++;
                    continue;
                }

                try {
                    $this->applyTransactionDelta($customer, $tx, $goldDelta, $rialDelta);
                    $walletApplied = true;

                    $summary = $this->sync->summarizeInboundDocument([
                        'accountId' => $accountId,
                        'accountName' => $data['accountName'] ?? null,
                        'transactions' => [$tx],
                    ]);

                    $log = PargarSyncLog::create([
                        'customer_id' => $customer->id,
                        'amount' => $summary['amount'],
                        'desc' => $summary['desc'] !== '' ? $summary['desc'] : 'اعمال سند پرگار',
                        'type' => PargarSyncService::TYPE_DOCUMENT,
                        'sync_status' => PargarSyncService::STATUS_SUCCESS,
                        'pargar_ref' => $fingerprint,
                        'data' => json_encode([
                            'accountId' => $accountId,
                            'accountName' => $data['accountName'] ?? null,
                            'transaction' => $tx,
                            'wallet_applied' => true,
                            'fingerprint' => $fingerprint,
                            'gold_delta' => $goldDelta,
                            'rial_delta' => $rialDelta,
                        ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT),
                    ]);

                    $result['applied']++;
                    $result['logs'][] = (int) $log->id;
                } catch (\Throwable $e) {
                    unset($this->seenFingerprints[$fingerprint]);
                    Log::warning('Pargar inbound document apply failed', [
                        'customer_id' => $customer->id,
                        'fingerprint' => $fingerprint,
                        'error' => $e->getMessage(),
                    ]);
                    $result['errors'][] = 'سند: '.$e->getMessage();
                }
            }

            if ($walletApplied && $broadcast) {
                $this->walletBroadcast->broadcastForCustomer(
                    (int) $customer->id,
                    (int) ($customer->type ?? 2)
                );
            }
        } finally {
            $lock->release();
        }

        return $result;
    }

    /**
     * دکمهٔ ادمین: فقط اختلاف ماندهٔ پرگار را یک‌بار اعمال می‌کند (نه replay اسناد).
     *
     * @return array{
     *   documents: array{applied: int, skipped: int, errors: list<string>, logs: list<int>},
     *   mande: array{applied: bool, gold_delta?: float, rial_delta?: float, message: string}
     * }
     */
    public function syncWalletFromPargar(Customer $customer, bool $forceMande = false): array
    {
        $lock = Cache::lock('pargar-wallet-sync:'.$customer->id, 90);
        if (! $lock->get()) {
            return [
                'documents' => ['applied' => 0, 'skipped' => 0, 'errors' => ['همگام‌سازی در حال اجراست'], 'logs' => []],
                'mande' => ['applied' => false, 'message' => 'همگام‌سازی دیگری برای این مشتری در حال اجراست — لطفاً صبر کنید'],
            ];
        }

        try {
            // عمداً replay اسناد قدیمی نداریم — باعث شارژ چندباره می‌شد
            return [
                'documents' => ['applied' => 0, 'skipped' => 0, 'errors' => [], 'logs' => []],
                'mande' => $this->applyLatestMandeDifference($customer, force: $forceMande),
            ];
        } finally {
            $lock->release();
        }
    }

    /**
     * @return array{applied: bool, gold_delta?: float, rial_delta?: float, message: string}
     */
    public function applyLatestMandeDifference(Customer $customer, bool $force = false): array
    {
        if ($this->hasPendingOutboundWalletSync((int) $customer->id)) {
            return [
                'applied' => false,
                'message' => 'سند ارسالی از پنل به پرگار هنوز تأیید نشده — برای جلوگیری از برگشت شارژ، ماندهٔ پرگار اعمال نشد',
            ];
        }

        $log = PargarSyncLog::query()
            ->where('customer_id', $customer->id)
            ->where('type', PargarSyncService::TYPE_MANDE)
            ->orderByDesc('id')
            ->first();

        if ($log === null) {
            return ['applied' => false, 'message' => 'لاگ ماندهٔ پرگار برای این مشتری یافت نشد'];
        }

        $data = json_decode((string) $log->data, true) ?: [];
        if (! $force && ! empty($data['wallet_applied_from_mande'])) {
            return ['applied' => false, 'message' => 'ماندهٔ پرگار قبلاً روی کیف اعمال شده است'];
        }

        $goldInv = $this->parseNumber($data['GoldInv'] ?? 0);
        $rialInv = $this->parseNumber($data['RialInv'] ?? 0);

        $ownerType = (int) ($customer->type ?? 2);
        $walletInterface = new WalletInterface((int) $customer->id, $ownerType);
        $wallet = $walletInterface->wallet;

        $goldDiff = $goldInv - (float) ($wallet->gold ?? 0);
        $rialDiff = $rialInv - (float) ($wallet->cash ?? 0);

        if (abs($goldDiff) < 0.01 && abs($rialDiff) < 1) {
            $data['wallet_applied_from_mande'] = true;
            $log->data = json_encode($data, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
            $log->save();

            return ['applied' => false, 'message' => 'اختلافی بین ماندهٔ پرگار و کیف اپ نیست'];
        }

        $input = [
            'title' => 'تطبیق ماندهٔ پرگار',
            'note' => 'mande-log:'.$log->id,
            'expire_at' => now(),
            'active' => true,
        ];
        if (abs($goldDiff) >= 0.01) {
            $input['gold'] = abs($goldDiff);
        }
        if (abs($rialDiff) >= 1) {
            $input['cash'] = abs($rialDiff);
        }

        new TransactionInterface(
            $walletInterface,
            $input,
            self::TX_TYPE_PARGAR,
            $goldDiff > 0,
            $rialDiff > 0
        );

        $data['wallet_applied_from_mande'] = true;
        $data['applied_gold_delta'] = $goldDiff;
        $data['applied_rial_delta'] = $rialDiff;
        $data['applied_at'] = now()->toDateTimeString();
        $log->data = json_encode($data, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
        $log->desc = 'اعمال ماندهٔ پرگار روی کیف اپ';
        $log->save();

        $this->walletBroadcast->broadcastForCustomer((int) $customer->id, $ownerType);

        return [
            'applied' => true,
            'gold_delta' => $goldDiff,
            'rial_delta' => $rialDiff,
            'message' => 'ماندهٔ پرگار روی کیف اعمال شد',
        ];
    }

    /**
     * @param  array<string, mixed>  $tx
     */
    public function transactionFingerprint(string $accountId, array $tx): string
    {
        // بدون docId — اگر پرگار هر بار شناسهٔ جدید بدهد همان مبلغ دوباره نخورد
        $parts = [
            $accountId,
            trim((string) ($tx['date'] ?? '')),
            trim((string) ($tx['docType'] ?? '')),
            trim((string) ($tx['desc'] ?? '')),
            $this->normalizeNumberString($tx['bedGold'] ?? 0),
            $this->normalizeNumberString($tx['besGold'] ?? 0),
            $this->normalizeNumberString($tx['bedRial'] ?? 0),
            $this->normalizeNumberString($tx['besRial'] ?? 0),
        ];

        return 'fp:'.hash('sha256', implode('|', $parts));
    }

    public function isFingerprintApplied(string $fingerprint): bool
    {
        if ($fingerprint === '' || isset($this->seenFingerprints[$fingerprint])) {
            return true;
        }

        return PargarSyncLog::query()
            ->where('type', PargarSyncService::TYPE_DOCUMENT)
            ->where('pargar_ref', $fingerprint)
            ->where('sync_status', PargarSyncService::STATUS_SUCCESS)
            ->exists();
    }

    /**
     * @param  array<string, mixed>  $tx
     */
    private function recordProcessedFingerprint(
        Customer $customer,
        string $fingerprint,
        string $accountId,
        array $tx,
        bool $walletApplied,
        string $reason
    ): void {
        if ($this->isFingerprintApplied($fingerprint) && ! isset($this->seenFingerprints[$fingerprint])) {
            return;
        }

        // اگر فقط در حافظه است و هنوز در DB نیست، برای skipها هم رکورد بساز تا تکرار نشود
        if (PargarSyncLog::query()
            ->where('type', PargarSyncService::TYPE_DOCUMENT)
            ->where('pargar_ref', $fingerprint)
            ->exists()) {
            return;
        }

        PargarSyncLog::create([
            'customer_id' => $customer->id,
            'desc' => $walletApplied
                ? 'اعمال سند پرگار'
                : ($reason === 'echo_outbound'
                    ? 'سند پرگار — قبلاً از پنل ارسال شده (بدون اعمال مجدد)'
                    : 'سند پرگار — رد شده'),
            'type' => PargarSyncService::TYPE_DOCUMENT,
            'sync_status' => PargarSyncService::STATUS_SUCCESS,
            'pargar_ref' => $fingerprint,
            'data' => json_encode([
                'accountId' => $accountId,
                'transaction' => $tx,
                'wallet_applied' => $walletApplied,
                'fingerprint' => $fingerprint,
                'skip_reason' => $walletApplied ? null : $reason,
            ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT),
        ]);
    }

    /**
     * @param  array<string, mixed>  $tx
     */
    private function applyTransactionDelta(Customer $customer, array $tx, float $goldDelta, float $rialDelta): void
    {
        $ownerType = (int) ($customer->type ?? 2);
        $walletInterface = new WalletInterface((int) $customer->id, $ownerType);

        $desc = trim((string) ($tx['desc'] ?? ''));
        $docType = trim((string) ($tx['docType'] ?? ''));
        $title = $desc !== '' ? $desc : ($docType !== '' ? $docType : 'سند پرگار');

        $input = [
            'title' => $title,
            'note' => trim((string) ($tx['docId'] ?? '')),
            'expire_at' => now(),
            'active' => true,
        ];

        if (abs($goldDelta) >= 0.01) {
            $input['gold'] = abs($goldDelta);
        }
        if (abs($rialDelta) >= 1) {
            $input['cash'] = abs($rialDelta);
        }

        new TransactionInterface(
            $walletInterface,
            $input,
            self::TX_TYPE_PARGAR,
            $goldDelta > 0,
            $rialDelta > 0
        );
    }

    /**
     * @param  array<string, mixed>  $tx
     */
    private function transactionGoldDelta(array $tx): float
    {
        return $this->parseNumber($tx['besGold'] ?? 0) - $this->parseNumber($tx['bedGold'] ?? 0);
    }

    /**
     * @param  array<string, mixed>  $tx
     */
    private function transactionRialDelta(array $tx): float
    {
        return $this->parseNumber($tx['besRial'] ?? 0) - $this->parseNumber($tx['bedRial'] ?? 0);
    }

    private function isEchoOfRecentOutbound(int $customerId, float $goldDelta, float $rialDelta): bool
    {
        $since = now()->subDays(3);

        $logs = PargarSyncLog::query()
            ->where('customer_id', $customerId)
            ->whereIn('type', [PargarSyncService::TYPE_WALLET_CASH, PargarSyncService::TYPE_WALLET_GOLD])
            ->where('created_at', '>=', $since)
            ->whereIn('sync_status', [PargarSyncService::STATUS_PENDING, PargarSyncService::STATUS_SUCCESS])
            ->get();

        foreach ($logs as $log) {
            $payload = json_decode((string) $log->data, true) ?: [];
            $signed = (float) ($payload['signed_amount'] ?? 0);
            $kind = (string) ($payload['kind'] ?? '');

            if ($kind === 'gold' && abs($goldDelta) >= 0.01 && abs(abs($signed) - abs($goldDelta)) < 0.01) {
                if (($signed > 0 && $goldDelta > 0) || ($signed < 0 && $goldDelta < 0)) {
                    return true;
                }
            }

            if ($kind === 'cash' && abs($rialDelta) >= 1 && abs(abs($signed) - abs($rialDelta)) < 1) {
                if (($signed > 0 && $rialDelta > 0) || ($signed < 0 && $rialDelta < 0)) {
                    return true;
                }
            }
        }

        return false;
    }

    private function hasPendingOutboundWalletSync(int $customerId): bool
    {
        return PargarSyncLog::query()
            ->where('customer_id', $customerId)
            ->whereIn('type', [PargarSyncService::TYPE_WALLET_CASH, PargarSyncService::TYPE_WALLET_GOLD])
            ->where('sync_status', PargarSyncService::STATUS_PENDING)
            ->exists();
    }

    private function normalizeNumberString(mixed $value): string
    {
        return (string) $this->parseNumber($value);
    }

    private function parseNumber(mixed $value): float
    {
        if ($value === null || $value === '') {
            return 0.0;
        }

        return (float) str_replace('/', '.', (string) $value);
    }
}