<?php

namespace App\Services;

use App\Http\Controllers\Single\SingleOrderController;
use App\Models\Order;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Schema;

class ColleagueOrderCallbackService
{
    public const POLL_SECONDS = 35;

    public const SSE_EVENT = 'colleague_order';

    public function waitEnabled(): bool
    {
        // همیشه منتظر کالبک/استعلام همکار — سوییچ montzar_order_wait_callback دیگر مسیر «قطعی بلافاصله» را باز نمی‌کند
        return app(ConfigService::class)->usesMontzarPricing();
    }

    public function callbackUrl(int $localOrderId): string
    {
        $origin = rtrim(app(ConfigService::class)->resolvePublicSiteUrl(), '/');
        if ($origin === '') {
            $origin = rtrim((string) config('app.url'), '/');
            $origin = (string) preg_replace('#/server/?$#', '', $origin);
        }

        return $origin . '/server/customer/colleague/order/callback/' . $localOrderId;
    }

    /**
     * @param  array<string, mixed>  $body
     */
    public function handleCallbackPayload(array $body, ?int $localOrderId = null): array
    {
        $order = $this->findPendingOrder($body, $localOrderId);
        if (!$order) {
            return ['ok' => false, 'message' => 'سفارش در انتظار یافت نشد'];
        }

        $sts = $this->providerStsFromBody($body);
        if ($sts === null) {
            return ['ok' => false, 'message' => 'وضعیت نامعتبر'];
        }

        $this->rememberProviderId($order, $body);

        return $this->applyProviderSts($order, $sts, $body);
    }

    public function refreshIfDue(Order $order): Order
    {
        if ((int) $order->sts !== 4) {
            return $order;
        }

        if (!$this->isPollDue($order)) {
            return $order;
        }

        try {
            $this->pollOne($order);
        } catch (\Throwable $e) {
            Log::warning('Colleague pending poll failed', [
                'order_id' => $order->id,
                'error' => $e->getMessage(),
            ]);
            $this->touchPollAt($order);
        }

        return Order::query()->find($order->id) ?? $order;
    }

    public function pollOne(Order $order): array
    {
        $providerId = (int) ($order->provider_id ?? 0);
        if ($providerId <= 0) {
            $this->touchPollAt($order);

            return ['ok' => true, 'state' => 'wait'];
        }

        $body = app(MontzarService::class)->fetchColleagueOrder($providerId);
        $this->touchPollAt($order);
        if (!is_array($body)) {
            return ['ok' => true, 'state' => 'wait'];
        }

        $sts = $this->providerStsFromBody($body);
        if ($sts === null) {
            return ['ok' => true, 'state' => 'wait'];
        }

        // جدول سفارش همکار همان sts مدل است (۲ موفق / ۳ ناموفق / ۴ هنوز باز).
        // کالبک جداست: آن‌جا ۴ و ۶ یعنی رد.
        if (in_array($sts, [3, 6], true)) {
            return $this->rejectPending($order, $body);
        }

        if ($sts === 2) {
            return $this->approvePending($order, $body);
        }

        return ['ok' => true, 'state' => 'wait', 'sts' => (int) $order->sts];
    }

    /**
     * @param  array<string, mixed>  $body
     */
    public function applyProviderSts(Order $order, int $providerSts, array $body = []): array
    {
        if (in_array($providerSts, [4, 6], true)) {
            return $this->rejectPending($order, $body);
        }

        if ($providerSts === 2) {
            return $this->approvePending($order, $body);
        }

        return ['ok' => true, 'state' => 'wait', 'sts' => (int) $order->sts];
    }

    public function pendingForCustomer(int $customerId): ?Order
    {
        if ($customerId <= 0) {
            return null;
        }

        return Order::query()
            ->where('customer_id', $customerId)
            ->where('sts', 4)
            ->orderByDesc('id')
            ->first();
    }

    public function publicStatusPayload(?Order $order): array
    {
        if (!$order) {
            return [
                'pending' => false,
                'order' => null,
                'sts' => null,
                'sts_str' => null,
            ];
        }

        $sts = (int) $order->sts;

        return [
            'pending' => $sts === 4,
            'order_id' => $order->id,
            'sts' => $sts,
            'sts_str' => Order::$STS[$sts] ?? null,
            'order' => $order,
        ];
    }

    public function broadcast(Order $order): void
    {
        $customerId = (int) ($order->customer_id ?? 0);
        if ($customerId <= 0) {
            return;
        }

        app(PriceStreamService::class)->publishForCustomer($customerId, self::SSE_EVENT, [
            'order_id' => $order->id,
            'sts' => (int) $order->sts,
            'sts_str' => Order::$STS[(int) $order->sts] ?? null,
            'pending' => (int) $order->sts === 4,
        ]);
    }

    /**
     * @param  array<string, mixed>  $body
     */
    private function findPendingOrder(array $body, ?int $localOrderId): ?Order
    {
        if ($localOrderId && $localOrderId > 0) {
            $order = Order::query()->where('id', $localOrderId)->where('sts', 4)->first();
            if ($order) {
                return $order;
            }
        }

        $providerId = $this->providerIdFromBody($body);
        if ($providerId > 0) {
            return Order::query()
                ->where('provider_id', $providerId)
                ->where('sts', 4)
                ->orderByDesc('id')
                ->first();
        }

        return null;
    }

    /**
     * @param  array<string, mixed>  $body
     */
    private function rememberProviderId(Order $order, array $body): void
    {
        $providerId = $this->providerIdFromBody($body);
        if ($providerId <= 0 || !Schema::hasColumn('orders', 'provider_id')) {
            return;
        }

        if ((int) ($order->provider_id ?? 0) === $providerId) {
            return;
        }

        $order->provider_id = $providerId;
        $order->save();
    }

    /**
     * @param  array<string, mixed>  $body
     */
    private function approvePending(Order $order, array $body): array
    {
        $this->rememberProviderId($order, $body);

        $done = false;
        DB::transaction(function () use ($order, &$done) {
            $locked = Order::query()->where('id', $order->id)->lockForUpdate()->first();
            if (!$locked || (int) $locked->sts !== 4) {
                return;
            }
            app(SingleOrderController::class)->finalizeColleaguePendingOrder($locked);
            $done = true;
        });

        $fresh = Order::find($order->id);
        if ($fresh) {
            $this->broadcast($fresh);
        }

        return [
            'ok' => true,
            'state' => $done ? 'approved' : 'ignored',
            'sts' => $fresh ? (int) $fresh->sts : 2,
        ];
    }

    /**
     * @param  array<string, mixed>  $body
     */
    private function rejectPending(Order $order, array $body): array
    {
        DB::transaction(function () use ($order, $body) {
            $locked = Order::query()->where('id', $order->id)->lockForUpdate()->first();
            if (!$locked || (int) $locked->sts !== 4) {
                return;
            }
            $message = trim((string) ($body['sts_str'] ?? $body['message'] ?? 'رد شده توسط همکار'));
            app(SingleOrderController::class)->rejectColleaguePendingOrder($locked, $message !== '' ? $message : 'رد شده توسط همکار');
        });

        $fresh = Order::find($order->id);
        if ($fresh) {
            $this->broadcast($fresh);
        }

        return [
            'ok' => true,
            'state' => 'rejected',
            'sts' => $fresh ? (int) $fresh->sts : 3,
        ];
    }

    private function touchPollAt(Order $order): void
    {
        if (!Schema::hasColumn('orders', 'colleague_last_poll_at')) {
            return;
        }

        $order->colleague_last_poll_at = now();
        $order->save();
    }

    private function isPollDue(Order $order): bool
    {
        $cutoff = now()->subSeconds(self::POLL_SECONDS);
        $last = $order->colleague_last_poll_at ?? null;
        if ($last) {
            return $last <= $cutoff;
        }

        $created = $order->created_at;

        return !$created || $created <= $cutoff;
    }

    /**
     * @param  array<string, mixed>  $body
     */
    public function providerStsFromBody(array $body): ?int
    {
        $rows = [$body, $body['data'] ?? null, $body['order'] ?? null];
        if (isset($body['rows']) && is_array($body['rows'])) {
            foreach ($body['rows'] as $row) {
                if (is_array($row)) {
                    $rows[] = $row;
                }
            }
        }
        foreach ($body as $item) {
            if (!is_array($item)) {
                continue;
            }
            $rows[] = $item;
            $rows[] = $item['order'] ?? null;
            $rows[] = $item['data'] ?? null;
        }

        foreach ($rows as $row) {
            if (!is_array($row) || !array_key_exists('sts', $row) || $row['sts'] === null || $row['sts'] === '') {
                continue;
            }

            return (int) $row['sts'];
        }

        return null;
    }

    /**
     * @param  array<string, mixed>  $body
     */
    private function providerIdFromBody(array $body): int
    {
        foreach ([$body, $body['data'] ?? null, $body['order'] ?? null] as $row) {
            if (!is_array($row)) {
                continue;
            }
            foreach (['order_id', 'id', 'provider_order_id'] as $key) {
                $value = (int) ($row[$key] ?? 0);
                if ($value > 0) {
                    return $value;
                }
            }
        }

        return 0;
    }
}