<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Shipment;
use App\Models\ShipmentStatusHistory;
use App\Enums\ShipmentStatus;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;

class StaffOrderController extends Controller
{
    /**
     * لیست سفارشات در انتظار تأیید
     * GET /api/v1/staff/orders/pending-approval
     */
    public function pendingApproval(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'per_page' => ['nullable', 'integer', 'min:1', 'max:100'],
        ]);

        $shipments = Shipment::query()
            ->where('status', ShipmentStatus::PendingApproval)
            ->with(['fromCountry', 'toCountry', 'user'])
            ->orderBy('created_at', 'asc')
            ->paginate($validated['per_page'] ?? 15);

        return response()->json([
            'success' => true,
            'data' => $shipments->map(function ($shipment) {
                return $this->formatShipment($shipment);
            }),
            'pagination' => [
                'current_page' => $shipments->currentPage(),
                'last_page' => $shipments->lastPage(),
                'per_page' => $shipments->perPage(),
                'total' => $shipments->total(),
            ],
        ]);
    }

    /**
     * تأیید سفارش توسط کارمند
     * POST /api/v1/staff/orders/{shipment}/approve
     */
    public function approve(Shipment $shipment, Request $request): JsonResponse
    {
        $user = Auth::user();

        // بررسی وضعیت
        if ($shipment->status !== ShipmentStatus::PendingApproval) {
            return response()->json([
                'success' => false,
                'message' => 'این سفارش در وضعیت قابل تأیید نیست.',
            ], 400);
        }

        $validated = $request->validate([
            'notes' => ['nullable', 'string', 'max:1000'],
        ]);

        try {
            DB::transaction(function () use ($shipment, $user, $validated) {
                // تغییر وضعیت به Approved
                $oldStatus = $shipment->status;
                $shipment->update([
                    'status' => ShipmentStatus::Approved,
                ]);

                // ثبت در تاریخچه تغییرات
                ShipmentStatusHistory::create([
                    'shipment_id' => $shipment->id,
                    'from_status' => $oldStatus->value,
                    'to_status' => ShipmentStatus::Approved->value,
                    'reason' => $validated['notes'] ?? 'تأیید توسط کارمند',
                    'changed_by' => $user->id,
                ]);
            });

            return response()->json([
                'success' => true,
                'message' => 'سفارش با موفقیت تأیید شد. مشتری می‌تواند پرداخت را انجام دهد.',
                'data' => $this->formatShipment($shipment->fresh()->load(['fromCountry', 'toCountry'])),
            ]);

        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'message' => 'خطا در تأیید سفارش: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * رد سفارش توسط کارمند
     * POST /api/v1/staff/orders/{shipment}/reject
     */
    public function reject(Shipment $shipment, Request $request): JsonResponse
    {
        $user = Auth::user();

        // بررسی وضعیت
        if ($shipment->status !== ShipmentStatus::PendingApproval) {
            return response()->json([
                'success' => false,
                'message' => 'این سفارش در وضعیت قابل رد نیست.',
            ], 400);
        }

        $validated = $request->validate([
            'reason' => ['required', 'string', 'max:1000'],
        ]);

        try {
            DB::transaction(function () use ($shipment, $user, $validated) {
                // تغییر وضعیت به Cancelled
                $oldStatus = $shipment->status;
                $shipment->update([
                    'status' => ShipmentStatus::Cancelled,
                ]);

                // ثبت در تاریخچه تغییرات
                ShipmentStatusHistory::create([
                    'shipment_id' => $shipment->id,
                    'from_status' => $oldStatus->value,
                    'to_status' => ShipmentStatus::Cancelled->value,
                    'reason' => 'رد شده: ' . $validated['reason'],
                    'changed_by' => $user->id,
                ]);
            });

            return response()->json([
                'success' => true,
                'message' => 'سفارش رد شد.',
                'data' => $this->formatShipment($shipment->fresh()->load(['fromCountry', 'toCountry'])),
            ]);

        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'message' => 'خطا در رد سفارش: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * فرمت کردن Shipment برای خروجی API
     */
    private function formatShipment(Shipment $shipment): array
    {
        return [
            'id' => $shipment->id,
            'awb_no' => $shipment->awb_no,
            'direction' => $shipment->direction?->value,
            'type' => $shipment->type?->value,
            'status' => [
                'value' => $shipment->status?->value,
                'label' => $shipment->status?->label(),
                'color' => $shipment->status?->color(),
            ],
            'from_country' => $shipment->fromCountry ? [
                'id' => $shipment->fromCountry->id,
                'name' => $shipment->fromCountry->name,
                'iso_code' => $shipment->fromCountry->iso_code,
            ] : null,
            'to_country' => $shipment->toCountry ? [
                'id' => $shipment->toCountry->id,
                'name' => $shipment->toCountry->name,
                'iso_code' => $shipment->toCountry->iso_code,
            ] : null,
            'user' => $shipment->user ? [
                'id' => $shipment->user->id,
                'name' => $shipment->user->name,
                'email' => $shipment->user->email,
            ] : null,
            'weight' => $shipment->weight,
            'chargeable_weight' => $shipment->chargeable_weight,
            'total_fee' => $shipment->total_fee,
            'created_at' => $shipment->created_at->toIso8601String(),
            'created_at_jalali' => $this->toJalali($shipment->created_at),
        ];
    }

    /**
     * تبدیل تاریخ به شمسی
     */
    private function toJalali($date): string
    {
        if (!$date) return '—';
        
        try {
            return \Morilog\Jalali\Jalalian::fromCarbon($date)->format('Y/m/d H:i');
        } catch (\Exception $e) {
            return $date->format('Y-m-d H:i');
        }
    }
}