<?php

namespace App\Http\Controllers;

use App\Http\Requests\StoreLieuRequest;
use App\Http\Requests\UpdateLieuRequest;
use App\Models\Lieu;
use App\Models\LieuType;
use App\Support\DbCompat;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\View\View;

class LieuController extends Controller
{
    public function search(Request $request): JsonResponse
    {
        $q = trim($request->get('q', ''));

        $lieux = Lieu::with('lieuType')
            ->where(function ($query) use ($q) {
                $query->where('nom_long', DbCompat::like(), "%{$q}%")
                      ->orWhere('nom',     DbCompat::like(), "%{$q}%")
                      ->orWhere('code',    DbCompat::like(), "%{$q}%");
            })
            ->orderBy('nom_long')
            ->limit(25)
            ->get();

        return response()->json($lieux->map(fn ($l) => [
            'id'       => $l->id,
            'nom_long' => $l->nom_long ?? $l->nom,
            'code'     => $l->code,
            'type'     => $l->lieuType?->nom,
        ]));
    }

    public function index(Request $request): View
    {
        $this->authorize('viewAny', Lieu::class);

        $query = Lieu::with(['parent', 'lieuType'])->orderBy('nom_long');

        if ($request->filled('lieu_type_id')) {
            $query->where('lieu_type_id', $request->integer('lieu_type_id'));
        }

        if ($request->filled('q')) {
            $q = trim($request->get('q'));
            $query->where(function ($wq) use ($q) {
                $wq->where('nom_long', DbCompat::like(), "%{$q}%")
                   ->orWhere('nom',    DbCompat::like(), "%{$q}%")
                   ->orWhere('code',   DbCompat::like(), "%{$q}%");
            });
        }

        if ($request->filled('lieu_id')) {
            $ids = $this->getDescendantAndSelfIds($request->integer('lieu_id'));
            $query->whereIn('id', $ids);
        }

        $lieuTypes       = LieuType::orderBy('ordre')->get(['id', 'nom']);
        $lieuSelectionne = $request->filled('lieu_id')
            ? Lieu::find($request->integer('lieu_id'), ['id', 'nom', 'nom_long'])
            : null;
        $lieux = $query->paginate(50)->withQueryString();

        return view('lieux.index', compact('lieux', 'lieuTypes', 'lieuSelectionne'));
    }

    public function create(): View
    {
        $this->authorize('create', Lieu::class);

        $lieuTypes = LieuType::orderBy('ordre')->get(['id', 'nom']);

        return view('lieux.create', compact('lieuTypes'));
    }

    public function store(StoreLieuRequest $request): RedirectResponse
    {
        $lieu = Lieu::create($request->validated());

        return redirect()->route('lieux.show', $lieu)
            ->with('success', 'Lieu créé avec succès.');
    }

    public function show(Lieu $lieu): View
    {
        $this->authorize('view', $lieu);

        $lieu->load('parent', 'enfants', 'lieuType');

        return view('lieux.show', compact('lieu'));
    }

    public function edit(Lieu $lieu): View
    {
        $this->authorize('update', $lieu);

        $lieu->load('parent', 'lieuType');
        $lieuTypes = LieuType::orderBy('ordre')->get(['id', 'nom']);

        return view('lieux.edit', compact('lieu', 'lieuTypes'));
    }

    public function update(UpdateLieuRequest $request, Lieu $lieu): RedirectResponse
    {
        $lieu->update($request->validated());
        $this->recalculerEnfants($lieu);

        return redirect()->route('lieux.show', $lieu)
            ->with('success', 'Lieu mis à jour.');
    }

    public function destroy(Lieu $lieu): RedirectResponse
    {
        $this->authorize('delete', $lieu);

        if ($lieu->enfants()->exists()) {
            return back()->with('error', 'Impossible de supprimer un lieu qui a des enfants.');
        }

        $lieu->delete();

        return redirect()->route('lieux.index')
            ->with('success', 'Lieu supprimé.');
    }

    private function getDescendantAndSelfIds(int $lieuId): array
    {
        $rows = DB::select("
            WITH RECURSIVE descendants AS (
                SELECT id FROM lieux WHERE id = ?
                UNION ALL
                SELECT l.id FROM lieux l
                INNER JOIN descendants d ON l.lieu_parent_id = d.id
            )
            SELECT id FROM descendants
        ", [$lieuId]);

        return collect($rows)->pluck('id')->toArray();
    }

    private function getDescendantIds(Lieu $lieu): array
    {
        $ids = [];
        foreach ($lieu->enfants as $enfant) {
            $ids[] = $enfant->id;
            $ids   = array_merge($ids, $this->getDescendantIds($enfant));
        }
        return $ids;
    }

    private function recalculerEnfants(Lieu $lieu): void
    {
        $lieu->load('enfants');
        foreach ($lieu->enfants as $enfant) {
            $enfant->update([]);
            $this->recalculerEnfants($enfant);
        }
    }
}