<?php

namespace App\Http\Controllers;

use App\Models\Contractor;
use App\Models\Product;
use App\Models\Scopes\YearScope;
use App\Services\ContractorPriceService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;
use Symfony\Component\HttpFoundation\BinaryFileResponse;

class ContractorController extends Controller
{
    protected string $id = 'contractors';
    protected array $header = [
        'id' => 'ID',
        'name' => 'Наименование',
        'legal_name' => 'Юридическое имя',
        'contract_number' => '№ договора',
        'contract_date' => 'Дата договора',
        'organization_form_name' => 'Форма',
        'tax_rate_name' => 'Налог',
        'hidden_txt' => 'Скрыт',
    ];
    protected array $searchFields = ['name', 'legal_name', 'contract_number', 'director_name'];

    public function index(Request $request): View
    {
        session(['gp_contractors' => $request->query()]);
        $nav = $this->startNavigationContext($request);

        $allowedSortFields = ['id', 'name', 'legal_name', 'contract_number', 'contract_date', 'organization_form', 'tax_rate', 'hidden'];
        $sortBy = in_array($request->get('sortBy'), $allowedSortFields, true) ? $request->get('sortBy') : 'name';
        $orderBy = $request->get('order') === 'desc' ? 'desc' : 'asc';

        $contractors = Contractor::query();
        if ($request->filled('s')) {
            $search = $request->get('s');
            $contractors->where(function ($query) use ($search) {
                foreach ($this->searchFields as $field) {
                    $query->orWhere($field, 'like', '%' . $search . '%');
                }
            });
        }

        $contractors = $contractors->orderBy($sortBy, $orderBy)->get();

        return view('contractors.index', [
            'active' => 'contractors',
            'id' => $this->id,
            'header' => $this->header,
            'sortBy' => $sortBy,
            'orderBy' => $orderBy,
            'searchFields' => $this->searchFields,
            'contractors' => $contractors,
            'organizationForms' => Contractor::ORGANIZATION_FORMS,
            'taxRates' => Contractor::TAX_RATES,
            'nav' => $nav,
        ]);
    }

    public function create(Request $request, ContractorPriceService $priceService): View
    {
        return $this->showForm($request, null, $priceService);
    }

    public function show(Request $request, Contractor $contractor, ContractorPriceService $priceService): View
    {
        return $this->showForm($request, $contractor, $priceService);
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $this->validatedContractor($request);
        $contractor = Contractor::query()->create($validated);

        return redirect()->route('contractors.show', $contractor)->with('success', 'Подрядчик создан');
    }

    public function update(Request $request, Contractor $contractor): RedirectResponse
    {
        $contractor->update($this->validatedContractor($request));

        return redirect()->route('contractors.show', $contractor)->with('success', 'Подрядчик сохранён');
    }

    public function updatePrice(Request $request, Contractor $contractor, ContractorPriceService $priceService): RedirectResponse
    {
        $validated = $request->validate([
            'product_id' => ['required', 'integer', 'exists:products,id'],
            'name_in_spec' => ['nullable', 'string', 'max:255'],
            'price' => ['nullable', 'numeric', 'min:0'],
        ]);

        $product = Product::withoutGlobalScope(YearScope::class)->withTrashed()->findOrFail($validated['product_id']);
        $priceService->updatePrice(
            $contractor,
            $product,
            year(),
            $validated['name_in_spec'] ?? null,
            (float) ($validated['price'] ?? 0),
        );

        return redirect()->route('contractors.show', $contractor)->with('success', 'Цена монтажа сохранена');
    }

    public function importPrices(Request $request, Contractor $contractor, ContractorPriceService $priceService): RedirectResponse
    {
        $validated = $request->validate([
            'import_file' => ['required', 'file', 'mimes:xlsx,xls'],
        ]);

        $result = $priceService->import($contractor, $validated['import_file'], year());
        $message = "Импорт завершён. Обновлено: {$result['updated']}. Без изменений: {$result['unchanged']}. Ошибок: " . count($result['errors']) . '.';

        return redirect()
            ->route('contractors.show', $contractor)
            ->with('success', $message)
            ->with('contractor_import_errors', $result['errors']);
    }

    public function exportPrices(Request $request, Contractor $contractor, ContractorPriceService $priceService): BinaryFileResponse
    {
        $catalogYear = year();

        $path = $priceService->export($contractor, $catalogYear);

        return response()
            ->download($path, 'Цены монтажа ' . $contractor->name . ' ' . $catalogYear . '.xlsx')
            ->deleteFileAfterSend();
    }

    private function showForm(Request $request, ?Contractor $contractor, ContractorPriceService $priceService): View
    {
        $nav = $this->resolveNavToken($request);
        $this->rememberNavigation($request, $nav);
        $year = year();

        return view('contractors.edit', [
            'active' => 'contractors',
            'contractor' => $contractor,
            'organizationForms' => Contractor::ORGANIZATION_FORMS,
            'taxRates' => Contractor::TAX_RATES,
            'priceRows' => $contractor ? $priceService->rowsForContractor($contractor, $year) : collect(),
            'catalogYear' => $year,
            'nav' => $nav,
            'back_url' => $this->navigationBackUrl($request, $nav, route('contractors.index', session('gp_contractors'))),
        ]);
    }

    private function validatedContractor(Request $request): array
    {
        return $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'legal_name' => ['required', 'string', 'max:255'],
            'contract_number' => ['required', 'string', 'max:255'],
            'contract_date' => ['required', 'date'],
            'director_name' => ['required', 'string', 'max:255'],
            'organization_form' => ['required', 'string', 'in:' . implode(',', array_keys(Contractor::ORGANIZATION_FORMS))],
            'tax_rate' => ['required', 'string', 'in:' . implode(',', array_keys(Contractor::TAX_RATES))],
            'contract_header' => ['required', 'string'],
            'hidden' => ['nullable', 'boolean'],
        ]) + ['hidden' => false];
    }
}