<?php

namespace App\Http\Controllers;

use App\Models\EdiCategory;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Routing\Controller as BaseController;

class EdiCategoryController extends BaseController
{

    use AuthorizesRequests, ValidatesRequests;

    public function __construct()
    {
        // zápisové operace jen pro přihlášené
        $this->middleware('auth:sanctum')->only(['store', 'update', 'destroy']);
    }

    /**
     * Seznam EDI kategorií (API, JSON).
     */
    public function index(Request $request): JsonResponse
    {
        $perPage = (int) $request->get('per_page', 100);

        $items = EdiCategory::query()
            ->with('categories')     // n:m vazba na Category, pokud ji chceš mít v odpovědi
            ->orderBy('value')
            ->paginate($perPage);

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

    /**
     * Vytvoření nové EDI kategorie.
     * Autorizace přes EdiCategoryPolicy@create.
     */
    public function store(Request $request): JsonResponse
    {
        $this->authorize('create', EdiCategory::class);

        $data      = $this->validateData($request);
        $relations = $this->validateRelations($request);

        $item = EdiCategory::create($data);

        if (array_key_exists('category_ids', $relations)) {
            $item->categories()->sync($relations['category_ids']);
        }

        $item->load('categories');

        return response()->json($item, 201);
    }

    /**
     * Detail jedné EDI kategorie.
     */
    public function show(EdiCategory $edi_category): JsonResponse
    {
        $edi_category->load('categories');

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

    /**
     * Aktualizace existující EDI kategorie (partial update).
     * Autorizace přes EdiCategoryPolicy@update.
     */
    public function update(Request $request, EdiCategory $edi_category): JsonResponse
    {
        $this->authorize('update', $edi_category);

        $data      = $this->validateData($request, partial: true);
        $relations = $this->validateRelations($request);

        $edi_category->fill($data);
        $edi_category->save();

        if (array_key_exists('category_ids', $relations)) {
            $edi_category->categories()->sync($relations['category_ids']);
        }

        $edi_category->load('categories');

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

    /**
     * Smazání EDI kategorie.
     * Autorizace přes EdiCategoryPolicy@delete.
     */
    public function destroy(EdiCategory $edi_category): JsonResponse
    {
        $this->authorize('delete', $edi_category);

        $edi_category->delete();

        return response()->json(null, 204);
    }

    /**
     * Validace dat pro store / update.
     */
    protected function validateData(Request $request, bool $partial = false): array
    {
        $required = $partial ? 'sometimes' : 'required';

        return $request->validate([
            'value' => [$required, 'string', 'max:255'],
        ]);
    }

    /**
     * Validace ID navázaných kategorií (Category).
     */
    protected function validateRelations(Request $request): array
    {
        return $request->validate([
            'category_ids'   => ['sometimes', 'array'],
            'category_ids.*' => ['integer', 'exists:categories,id'],
        ]);
    }
}