<?php

namespace App\Http\Controllers;

use App\Enums\HuntDifficulty;
use App\Models\Hunts;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Log;

class HuntsController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        try {
            $searchTerm = $this->resolveSearchTerm($request);

            // Construire les filtres Meilisearch
            $filters = $this->buildMeilisearchFilters($request);

            // Construire la recherche
            $search = Hunts::search($searchTerm ?? '')
                ->query(fn ($query) => $query->with('participants:id,avatar_uri'));

            // N'ajouter le filter que s'il n'est pas vide
            if ($filters !== '') {
                $search->options([
                    'filter' => $filters,
                ]);
            }

            // (utile en prod pour vérifier ce qui est réellement envoyé)
            Log::info('HUNTS_SEARCH', [
                'q' => $searchTerm ?? '',
                'filters' => $filters,
                'meili_host' => config('scout.meilisearch.host'),
                'index' => (new Hunts)->searchableAs(),
            ]);

            $hunts = $search->paginate(10);

            return response()->json($hunts);
        } catch (\Throwable $e) {
            Log::error('Error fetching hunts: '.$e->getMessage());

            return response()->json([
                'error' => 'Server Error',
                'message' => $e->getMessage(),
            ], 500);
        }
    }

    private function buildMeilisearchFilters(Request $request): string
    {
        $filters = [];

        // participating
        if ($request->has('participating')) {
            $participating = filter_var(
                $request->query('participating'),
                FILTER_VALIDATE_BOOLEAN,
                FILTER_NULL_ON_FAILURE
            );

            $userId = auth('sanctum')->id();

            if ($userId) {
                if ($participating === true) {
                    $filters[] = "participant_ids = {$userId}";
                } elseif ($participating === false) {
                    $filters[] = "participant_ids != {$userId}";
                }
            } elseif ($participating === true) {
                $filters[] = "id < 0";
            }
        }

        // active
        if ($request->has('active')) {
            $now = Carbon::now('UTC')->timestamp; // ✅ UTC
            $active = filter_var($request->query('active'), FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);

            if ($active === true) {
                $filters[] = "start_at_timestamp <= {$now}";
                $filters[] = "(end_at_timestamp >= {$now} OR end_at_timestamp IS NULL)";
            } else {
                $filters[] = "(start_at_timestamp > {$now} OR end_at_timestamp < {$now})";
            }
        }

        // city
        if ($request->filled('city')) {
            $city = $request->query('city');
            if (is_string($city)) {
                // ✅ échapper correctement les quotes
                $city = str_replace('"', '\"', $city);
                $filters[] = "city = \"{$city}\"";
            }
        }

        // difficulty
        if ($request->filled('difficulty')) {
            $difficulties = $request->query('difficulty');

            if (is_string($difficulties)) {
                $difficulties = explode(',', $difficulties);
            }

            if (is_array($difficulties)) {
                $validDifficulties = array_values(array_intersect(
                    HuntDifficulty::values(),
                    array_map('strtolower', $difficulties)
                ));

                if (!empty($validDifficulties)) {
                    $difficultyFilters = array_map(fn ($d) => "difficulty = \"{$d}\"", $validDifficulties);
                    $filters[] = '(' . implode(' OR ', $difficultyFilters) . ')';
                }
            }
        }

        // ✅ Dates (UTC + end-of-day si nécessaire)
        $startFrom = $this->parseDateFilterUtc($request->query('start_from'));
        $startTo   = $this->parseDateFilterUtc($request->query('start_to'), true);
        $endFrom   = $this->parseDateFilterUtc($request->query('end_from'));
        $endTo     = $this->parseDateFilterUtc($request->query('end_to'), true);

        if ($startFrom) {
            $filters[] = "start_at_timestamp >= {$startFrom->timestamp}";
        }
        if ($startTo) {
            $filters[] = "start_at_timestamp <= {$startTo->timestamp}";
        }
        if ($endFrom) {
            $filters[] = "end_at_timestamp >= {$endFrom->timestamp}";
        }
        if ($endTo) {
            $filters[] = "end_at_timestamp <= {$endTo->timestamp}";
        }

        return implode(' AND ', $filters);
    }

    private function resolveSearchTerm(Request $request): ?string
    {
        $searchTerm = $request->query('search') ?? $request->query('q');

        if (!is_string($searchTerm)) {
            return null;
        }

        $searchTerm = trim($searchTerm);

        return $searchTerm !== '' ? $searchTerm : null;
    }

    /**
     * Parse une date en UTC.
     * Si $endOfDay=true et que l'entrée ressemble à une date "YYYY-MM-DD",
     * on la transforme en fin de journée UTC.
     */
    private function parseDateFilterUtc(mixed $value, bool $endOfDay = false): ?Carbon
    {
        if (!is_string($value) || trim($value) === '') {
            return null;
        }

        try {
            $value = trim($value);

            // Si le front envoie une date simple "2026-01-30"
            if ($endOfDay && preg_match('/^\d{4}-\d{2}-\d{2}$/', $value)) {
                return Carbon::createFromFormat('Y-m-d', $value, 'UTC')->endOfDay();
            }

            // ISO 8601 type "2026-01-29T23:00:00.000Z" => UTC garanti
            return Carbon::parse($value)->utc();
        } catch (\Throwable $e) {
            return null;
        }
    }
}