<?php

namespace App\Http\Controllers;

use App\Models\Band;
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 BandController extends BaseController
{
    use AuthorizesRequests, ValidatesRequests;

    public function __construct()
    {
        $this->middleware('auth:sanctum')->except(['index', 'show']);
    }

    /**
     * Seznam pásem (s stránkováním).
     */
    public function index(Request $request): JsonResponse
    {
        $perPage = (int) $request->get('per_page', 100);

        $bands = Band::query()
            ->with(['ediBands', 'contests'])
            ->orderBy('order')
            ->paginate($perPage);

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

    /**
     * Vytvoří nové pásmo.
     */
    public function store(Request $request): JsonResponse
    {
        $this->authorize('create', Band::class);

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

        $relations = $request->validate([
            'edi_band_ids'   => ['sometimes', 'array'],
            'edi_band_ids.*' => ['integer', 'exists:edi_bands,id'],
            'contest_ids'    => ['sometimes', 'array'],
            'contest_ids.*'  => ['integer', 'exists:contests,id'],
        ]);

        $band = Band::create($data);

        if (array_key_exists('edi_band_ids', $relations)) {
            $band->ediBands()->sync($relations['edi_band_ids']);
        }

        if (array_key_exists('contest_ids', $relations)) {
            $band->contests()->sync($relations['contest_ids']);
        }

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

    /**
     * Detail jednoho pásma.
     */
    public function show(Band $band): JsonResponse
    {
        $band->load(['ediBands', 'contests']);

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

    /**
     * Aktualizace existujícího pásma.
     */
    public function update(Request $request, Band $band): JsonResponse
    {
        $this->authorize('update', $band);

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

        $relations = $request->validate([
            'edi_band_ids'   => ['sometimes', 'array'],
            'edi_band_ids.*' => ['integer', 'exists:edi_bands,id'],
            'contest_ids'    => ['sometimes', 'array'],
            'contest_ids.*'  => ['integer', 'exists:contests,id'],
        ]);

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

        if (array_key_exists('edi_band_ids', $relations)) {
            $band->ediBands()->sync($relations['edi_band_ids']);
        }

        if (array_key_exists('contest_ids', $relations)) {
            $band->contests()->sync($relations['contest_ids']);
        }

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

    /**
     * Smazání pásma.
     */
    public function destroy(Band $band): JsonResponse
    {
        $this->authorize('delete', $band);

        $band->delete();

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

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

        return $request->validate([
            'name'             => [$required, 'string', 'max:255'],
            'order'            => [$required, 'integer'],
            'edi_band_begin'   => [$required, 'integer'],
            'edi_band_end'     => [$required, 'integer', 'gte:edi_band_begin'],
            'has_power_category' => [$required, 'boolean'],
        ]);
    }
}