<?php

namespace App\Http\Controllers;

use App\Http\Requests\StoreSparePartRequest;
use App\Jobs\Export\ExportSparePartsJob;
use App\Jobs\Import\ImportSparePartsJob;
use App\Models\Import;
use App\Models\SparePart;
use App\Models\SparePartsView;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use League\CommonMark\Extension\HeadingPermalink\HeadingPermalinkExtension;

class SparePartController extends Controller
{
    protected array $data = [
        'active' => 'spare_parts',
        'title' => 'Каталог запчастей',
        'id' => 'spare_parts',
        'header' => [
            'image' => 'Картинка',
            'id' => 'ID',
            'article' => 'Артикул',
            'used_in_maf' => 'Где используется',
            'quantity_without_docs' => 'Кол-во без док',
            'quantity_with_docs' => 'Кол-во с док',
            'total_quantity' => 'Кол-во общее',
            'note' => 'Примечание',
            'customer_price_txt' => 'Цена для заказчика',
            'expertise_price_txt' => 'Цена экспертизы',
            'tsn_number' => '№ по ТСН',
            'pricing_codes_list' => 'Шифр расценки и коды ресурсов',
            'min_stock' => 'Минимальный остаток',
        ],
        'searchFields' => [
            'article',
            'used_in_maf',
            'note',
            'tsn_number',
        ],
        'routeName' => 'spare_parts.show',
    ];

    public function index(Request $request)
    {
        session(['gp_spare_parts' => $request->query()]);
        $nav = $this->startNavigationContext($request);
        $model = new SparePartsView();

        // Для админа добавляем колонку цены закупки
        if (hasRole('admin')) {
            $this->data['header'] = array_merge(
                array_slice($this->data['header'], 0, 8, true),
                ['purchase_price_txt' => 'Цена закупки'],
                array_slice($this->data['header'], 8, null, true)
            );
        }

        // Фильтры
        $this->createFilters($model, 'used_in_maf');
        $this->data['filters']['customer_price_txt'] = [
            'title' => $this->data['header']['customer_price_txt'],
            'values' => [],
        ];
        $this->data['filters']['expertise_price_txt'] = [
            'title' => $this->data['header']['expertise_price_txt'],
            'values' => [],
        ];
        $this->data['filters']['pricing_codes_list'] = [
            'title' => $this->data['header']['pricing_codes_list'],
            'values' => [],
        ];
        if (hasRole('admin')) {
            $this->data['filters']['purchase_price_txt'] = [
                'title' => $this->data['header']['purchase_price_txt'],
                'values' => [],
            ];
        }

        // Запрос
        $q = $model::query()->with('pricingCodes');

        $this->acceptFilters($q, $request);
        $this->acceptSearch($q, $request);

        $this->setSortAndOrderBy($model, $request);
        if ($request->get('sortBy') === 'pricing_codes_list') {
            $this->data['sortBy'] = 'pricing_codes_list';
            $q->orderBy(
                DB::table('spare_part_pricing_code as sppc')
                    ->join('pricing_codes as pc', 'pc.id', '=', 'sppc.pricing_code_id')
                    ->selectRaw('MIN(pc.code)')
                    ->whereColumn('sppc.spare_part_id', 'spare_parts_view.id'),
                $this->data['orderBy'] ?? 'asc'
            )->orderBy('id', $this->data['orderBy'] ?? 'asc');
        } else {
            $this->applyStableSorting($q);
        }

        $this->data['spare_parts'] = $q->paginate($this->data['per_page'])->withQueryString();
        $this->data['strings'] = $this->data['spare_parts'];
        $this->data['tab'] = 'catalog';
        $this->data['nav'] = $nav;

        return view('spare_parts.index', $this->data);
    }

    public function show(Request $request, SparePart $sparePart)
    {
        $nav = $this->resolveNavToken($request);
        $this->rememberNavigation($request, $nav);
        $this->data['nav'] = $nav;
        $this->data['back_url'] = $this->navigationBackUrl(
            $request,
            $nav,
            route('spare_parts.index', session('gp_spare_parts'))
        );
        $this->data['spare_part'] = $sparePart;
        return view('spare_parts.edit', $this->data);
    }

    public function help()
    {
        $markdownPath = base_path('docs/spare-parts.md');
        $markdown = File::exists($markdownPath) ? File::get($markdownPath) : '# Справка не найдена';
        $this->data['helpContent'] = Str::markdown($markdown, [
            'heading_permalink' => [
                'html_class' => 'heading-permalink',
                'id_prefix' => '',
                'fragment_prefix' => '',
                'insert' => 'none',
                'apply_id_to_heading' => true,
                'min_heading_level' => 1,
                'max_heading_level' => 6,
                'symbol' => '',
            ],
        ], [
            new HeadingPermalinkExtension(),
        ]);
        $this->data['tab'] = 'help';

        return view('spare_parts.index', $this->data);
    }

    public function create(Request $request)
    {
        $nav = $this->resolveNavToken($request);
        $this->rememberNavigation($request, $nav);
        $this->data['nav'] = $nav;
        $this->data['back_url'] = $this->navigationBackUrl(
            $request,
            $nav,
            route('spare_parts.index', session('gp_spare_parts'))
        );
        $this->data['spare_part'] = null;
        return view('spare_parts.edit', $this->data);
    }

    public function store(StoreSparePartRequest $request): RedirectResponse
    {
        $sparePart = SparePart::create($request->validated());
        $this->syncPricingCodes($sparePart, $request);
        $nav = $this->resolveNavToken($request);
        $backUrl = $this->navigationParentUrl(
            $nav,
            route('spare_parts.index', session('gp_spare_parts'))
        );
        return redirect()->to($backUrl)->with(['success' => 'Запчасть успешно создана!']);
    }

    public function update(StoreSparePartRequest $request, SparePart $sparePart): RedirectResponse
    {
        $sparePart->update($request->validated());
        $this->syncPricingCodes($sparePart, $request);
        $nav = $this->resolveNavToken($request);
        $backUrl = $this->navigationParentUrl(
            $nav,
            route('spare_parts.index', session('gp_spare_parts'))
        );
        return redirect()->to($backUrl)->with(['success' => 'Запчасть успешно обновлена!']);
    }

    protected function syncPricingCodes(SparePart $sparePart, StoreSparePartRequest $request): void
    {
        $codes = $request->input('pricing_codes', []);
        $descriptions = $request->input('pricing_codes_descriptions', []);

        $pricingCodeIds = [];

        foreach ($codes as $index => $code) {
            $code = trim($code);
            if (empty($code)) {
                continue;
            }

            $description = trim($descriptions[$index] ?? '');

            // Находим или создаём PricingCode
            $pricingCode = \App\Models\PricingCode::where('type', \App\Models\PricingCode::TYPE_PRICING_CODE)
                ->where('code', $code)
                ->first();

            if ($pricingCode) {
                // Обновляем расшифровку, если предоставлена
                if ($description && $description !== $pricingCode->description) {
                    $pricingCode->update(['description' => $description]);
                }
            } else {
                // Создаём новый код
                $pricingCode = \App\Models\PricingCode::create([
                    'type' => \App\Models\PricingCode::TYPE_PRICING_CODE,
                    'code' => $code,
                    'description' => $description ?: null,
                ]);
            }

            $pricingCodeIds[] = $pricingCode->id;
        }

        // Синхронизируем связи
        $sparePart->pricingCodes()->sync($pricingCodeIds);
    }

    public function destroy(SparePart $sparePart): RedirectResponse
    {
        // Проверка на наличие заказов
        if ($sparePart->orders()->count() > 0) {
            return redirect()->route('spare_parts.index', session('gp_spare_parts'))
                ->with(['error' => 'Невозможно удалить запчасть, т.к. для неё есть заказы!']);
        }

        $sparePart->delete();
        return redirect()->route('spare_parts.index', session('gp_spare_parts'))
            ->with(['success' => 'Запчасть успешно удалена!']);
    }

    public function export(Request $request): RedirectResponse
    {
        // Запускаем Job для экспорта
        ExportSparePartsJob::dispatch(auth()->id());
        Log::info('ExportSparePartsJob created!');

        return redirect()->route('spare_parts.index', session('gp_spare_parts'))
            ->with(['success' => 'Задача экспорта успешно создана!']);
    }

    public function import(Request $request): RedirectResponse
    {
        $request->validate([
            'file' => 'required|mimes:xlsx,xls|max:10240',
        ]);

        try {
            // Сохраняем временный файл
            $file = $request->file('file');
            $tempPath = $file->storeAs('temp/imports', 'spare_parts_import_' . time() . '.xlsx');
            $fullPath = Storage::path($tempPath);

            // Создаём запись импорта
            $import = Import::create([
                'user_id' => auth()->id(),
                'type' => 'spare_parts',
                'status' => Import::STATUS_PENDING,
                'file_path' => $tempPath,
                'original_filename' => $file->getClientOriginalName(),
            ]);

            // Запускаем Job для импорта
            ImportSparePartsJob::dispatch($fullPath, auth()->id(), $import->id);
            Log::info('ImportSparePartsJob created!', ['import_id' => $import->id]);

            return redirect()->route('spare_parts.index', session('gp_spare_parts'))
                ->with(['success' => 'Задача импорта успешно создана! Следите за статусом в разделе импорта.']);
        } catch (\Exception $e) {
            Log::error('Ошибка создания задачи импорта: ' . $e->getMessage());

            return redirect()->route('spare_parts.index', session('gp_spare_parts'))
                ->with(['error' => 'Ошибка импорта: ' . $e->getMessage()]);
        }
    }

    public function uploadImage(Request $request, SparePart $sparePart): RedirectResponse
    {
        $request->validate([
            'image' => 'required|image|mimes:jpeg,jpg,png|max:2048',
        ]);

        if ($request->hasFile('image')) {
            $image = $request->file('image');
            $filename = $sparePart->article . '.jpg';

            // Создаём директорию если её нет
            $directory = public_path('images/spare_parts');
            if (!file_exists($directory)) {
                mkdir($directory, 0755, true);
            }

            // Сохраняем изображение
            $image->move($directory, $filename);

            Cache::forget('spare_part_image:' . $sparePart->article);

            return $this->redirectToSparePartShow($request, $sparePart)
                ->with(['success' => 'Изображение успешно загружено!']);
        }

        return $this->redirectToSparePartShow($request, $sparePart)
            ->with(['error' => 'Ошибка загрузки изображения!']);
    }

    /**
     * API метод для поиска запчастей (autocomplete)
     */
    public function search(Request $request)
    {
        $query = $request->get('query', '');

        $spareParts = SparePart::query()
            ->where(function ($q) use ($query) {
                $q->where('article', 'LIKE', '%' . $query . '%')
                    ->orWhere('note', 'LIKE', '%' . $query . '%');
            })
            ->orderBy('article')
            ->limit(20)
            ->get(['id', 'article', 'note']);

        return response()->json($spareParts);
    }

    private function redirectToSparePartShow(Request $request, SparePart $sparePart): RedirectResponse
    {
        $nav = $this->resolveNavToken($request);

        return redirect()->route('spare_parts.show', $this->withNav(['sparePart' => $sparePart], $nav));
    }

}