<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\CommitmentForm;
use App\Models\Shipment;
use App\Models\ShipmentCommitmentForm;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;

class CommitmentFormController extends Controller
{
    /**
     * دریافت لیست فایل‌های تعهدنامه فعال
     * GET /api/v1/commitment-forms
     */
    public function index(): JsonResponse
    {
        $forms = CommitmentForm::query()
            ->where('is_active', true)
            ->orderBy('sort_order')
            ->orderBy('created_at', 'desc')
            ->get()
            ->map(fn ($form) => [
                'id' => $form->id,
                'title' => $form->title,
                'description' => $form->description,
                'file_url' => $form->file_url,
                'file_type' => strtoupper(pathinfo($form->file_path, PATHINFO_EXTENSION)),
                'direction' => $form->direction,
            ]);

        return response()->json([
            'success' => true,
            'data' => $forms,
        ]);
    }

    /**
     * دریافت تعهدنامه‌ها بر اساس جهت ارسال
     * GET /api/v1/commitment-forms/{direction}
     */
    public function byDirection(string $direction): JsonResponse
    {
        $forms = CommitmentForm::query()
            ->where('is_active', true)
            ->where(function ($query) use ($direction) {
                $query->where('direction', 'both')
                    ->orWhere('direction', $direction);
            })
            ->orderBy('sort_order')
            ->orderBy('created_at', 'desc')
            ->get()
            ->map(fn ($form) => [
                'id' => $form->id,
                'title' => $form->title,
                'description' => $form->description,
                'file_url' => $form->file_url,
                'file_type' => strtoupper(pathinfo($form->file_path, PATHINFO_EXTENSION)),
                'direction' => $form->direction,
            ]);

        return response()->json([
            'success' => true,
            'data' => $forms,
        ]);
    }

    /**
     * دریافت لیست تعهدنامه‌های مربوط به سفارش خاص
     * GET /api/v1/customer/orders/{shipment}/commitment-forms
     */
    public function shipmentForms(Shipment $shipment): JsonResponse
    {
        $user = auth()->user();

        // بررسی مالکیت
        if ($shipment->user_id !== $user->id) {
            return response()->json([
                'success' => false,
                'message' => 'شما به این سفارش دسترسی ندارید.',
            ], 403);
        }

        $forms = CommitmentForm::query()
            ->where('is_active', true)
            ->where(function ($query) use ($shipment) {
                $query->where('direction', 'both')
                    ->orWhere('direction', $shipment->direction);
            })
            ->orderBy('sort_order')
            ->orderBy('created_at', 'desc')
            ->get();

        $rows = ShipmentCommitmentForm::where('shipment_id', $shipment->id)
            ->whereIn('commitment_form_id', $forms->pluck('id'))
            ->get()
            ->keyBy('commitment_form_id');

        // ساخت ردیف pending برای فرم‌هایی که هنوز رکورد ندارند —
        // تا بخش تعهدنامه‌ها در پنل ادمین همه فرم‌ها را همراه وضعیت نمایش دهد
        foreach ($forms as $form) {
            if (!isset($rows[$form->id])) {
                $rows[$form->id] = ShipmentCommitmentForm::create([
                    'shipment_id' => $shipment->id,
                    'commitment_form_id' => $form->id,
                    'status' => 'pending',
                ]);
            }
        }

        $data = $forms->map(function ($form) use ($shipment, $rows) {
            $upload = $rows[$form->id];

            return [
                'id' => $form->id,
                'title' => $form->title,
                'description' => $form->description,
                // 🛡️ URL دانلود قالب از طریق route محافظت‌شده (نه asset عمومی)
                'file_url' => route('customer.commitment-forms.template', [
                    'shipment' => $shipment->id,
                    'form' => $form->id,
                ]),
                'file_type' => strtoupper(pathinfo($form->file_path, PATHINFO_EXTENSION)),
                'direction' => $form->direction,
                'upload_status' => $upload->status,
                'uploaded_file_url' => $upload->uploaded_file_path
                    ? route('customer.commitment-forms.download', ['shipment' => $shipment->id, 'form' => $form->id])
                    : null,
                'uploaded_at' => $upload->created_at,
                'notes' => $upload->notes,
            ];
        });

        return response()->json([
            'success' => true,
            'data' => $data,
        ]);
    }

    /**
     * دانلود قالب خام تعهدنامه (محافظت‌شده با بررسی مالکیت سفارش).
     * GET /api/v1/customer/orders/{shipment}/commitment-forms/{form}/template
     */
    public function downloadTemplate(Shipment $shipment, CommitmentForm $form)
    {
        $user = auth()->user();

        if ($shipment->user_id !== $user->id) {
            return response()->json([
                'success' => false,
                'message' => 'شما به این سفارش دسترسی ندارید.',
            ], 403);
        }

        if (!$form->file_path || !Storage::disk('public')->exists($form->file_path)) {
            return response()->json([
                'success' => false,
                'message' => 'فایل قالب یافت نشد.',
            ], 404);
        }

        $ext = pathinfo($form->file_path, PATHINFO_EXTENSION);
        $filename = 'template-' . $form->id . '-' . $shipment->awb_no . '.' . $ext;

        return Storage::disk('public')->download($form->file_path, $filename);
    }

    /**
     * آپلود فرم تعهدنامه امضاشده
     * POST /api/v1/customer/orders/{shipment}/commitment-forms/{form}/upload
     */
    public function uploadSigned(Request $request, Shipment $shipment, CommitmentForm $form): JsonResponse
    {
        $user = auth()->user();

        // بررسی مالکیت
        if ($shipment->user_id !== $user->id) {
            return response()->json([
                'success' => false,
                'message' => 'شما به این سفارش دسترسی ندارید.',
            ], 403);
        }

        $request->validate([
            'file' => 'required|file|mimes:pdf,jpg,jpeg,png|max:5120', // حداکثر 5MB
            'notes' => 'nullable|string|max:1000',
        ]);

        try {
            $file = $request->file('file');
            // 🛡️ ذخیره در دیسک امن (غیرعمومی) — فقط از طریق route محافظت‌شده قابل دانلود
            $path = $file->store("commitment-forms/{$shipment->id}", 'secure');

            $upload = ShipmentCommitmentForm::updateOrCreate(
                [
                    'shipment_id' => $shipment->id,
                    'commitment_form_id' => $form->id,
                ],
                [
                    'uploaded_file_path' => $path,
                    'uploaded_file_type' => $file->getClientOriginalExtension(),
                    'uploaded_file_size' => $file->getSize(),
                    'status' => 'uploaded',
                    'notes' => $request->input('notes'),
                    'uploaded_by' => $user->id,
                ]
            );

            return response()->json([
                'success' => true,
                'message' => 'فایل با موفقیت آپلود شد.',
                'data' => [
                    'id' => $upload->id,
                    'file_url' => route('customer.commitment-forms.download', [
                        'shipment' => $shipment->id,
                        'form' => $form->id,
                    ]),
                    'file_type' => $upload->uploaded_file_type,
                    'status' => $upload->status,
                    'uploaded_at' => $upload->created_at,
                ],
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'message' => 'خطا در آپلود فایل: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * دانلود فرم تعهدنامه امزاشده (محافظت‌شده با بررسی مالکیت).
     * GET /api/v1/customer/orders/{shipment}/commitment-forms/{form}/download
     */
    public function downloadSigned(Shipment $shipment, CommitmentForm $form)
    {
        $user = auth()->user();

        if ($shipment->user_id !== $user->id) {
            return response()->json([
                'success' => false,
                'message' => 'شما به این سفارش دسترسی ندارید.',
            ], 403);
        }

        $upload = ShipmentCommitmentForm::where('shipment_id', $shipment->id)
            ->where('commitment_form_id', $form->id)
            ->firstOrFail();

        if (!$upload->uploaded_file_path) {
            return response()->json([
                'success' => false,
                'message' => 'فایلی برای این تعهدنامه آپلود نشده است.',
            ], 404);
        }

        return Storage::disk('secure')->download(
            $upload->uploaded_file_path,
            'commitment-' . $form->id . '-' . $shipment->awb_no . '.' . $upload->uploaded_file_type
        );
    }
}