<?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);
            $filters = $this->buildMeilisearchFilters($request);

            $search = Hunts::search($searchTerm ?? '')
                ->query(fn ($query) => $query->with('participants:id,avatar_uri'))
                ->options(['filter' => $filters]);

            Log::info('HUNTS_SEARCH', [
                'q' => $searchTerm ?? '',
                'filters' => $filters,
                'meili_host' => config('scout.meilisearch.host'),
                'index' => (new Hunts)->searchableAs(),
                'request_params' => $request->all(),
            ]);

            $result = $search->paginate(10);
            
            Log::info('HUNTS_SEARCH_SUCCESS', [
                'total' => $result->total(),
                'count' => count($result->items()),
            ]);

            return response()->json($result);
        } catch (\Throwable $e) {
            Log::error('HUNTS_ERROR_CAUGHT', [
                'message' => $e->getMessage(),
                'file' => $e->getFile(),
                'line' => $e->getLine(),
                'trace' => $e->getTraceAsString(),
            ]);

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

    public function show(Hunts $hunt): JsonResponse
    {
        try {
            // Charger les relations nécessaires
            $hunt->load([
                'participants:id,username,avatar_uri,xp,level_id',
                'participants.currentLevel',
                'steps'
            ]);

            Log::info('HUNT_SHOW_SUCCESS', [
                'hunt_id' => $hunt->id,
                'hunt_title' => $hunt->title,
            ]);

            return response()->json($hunt);
        } catch (\Throwable $e) {
            Log::error('HUNT_SHOW_ERROR', [
                'hunt_id' => $hunt->id ?? null,
                'message' => $e->getMessage(),
                'file' => $e->getFile(),
                'line' => $e->getLine(),
                'trace' => $e->getTraceAsString(),
            ]);

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

    public function store(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'title' => 'required|string|max:255',
                'description' => 'nullable|string',
                'city' => 'required|string|max:255',
                'difficulty' => 'required|string',
                'latitude' => 'nullable|numeric',
                'longitude' => 'nullable|numeric',
                'is_public' => 'boolean',
                'estimated_duration_min' => 'nullable|integer',
                'start_at' => 'nullable|date',
                'end_at' => 'nullable|date|after:start_at',
                'image' => 'nullable|string',
            ]);

            $validated['creator_id'] = auth('sanctum')->id();
            $validated['slug'] = \Illuminate\Support\Str::slug($validated['title']);

            // Ensure slug is unique
            $originalSlug = $validated['slug'];
            $counter = 1;
            while (Hunts::where('slug', $validated['slug'])->exists()) {
                $validated['slug'] = $originalSlug . '-' . $counter;
                $counter++;
            }

            $hunt = Hunts::create($validated);

            Log::info('HUNT_CREATED', [
                'hunt_id' => $hunt->id,
                'creator_id' => $validated['creator_id'],
            ]);

            return response()->json($hunt, 201);
        } catch (\Illuminate\Validation\ValidationException $e) {
            return response()->json([
                'error' => 'Validation Error',
                'messages' => $e->errors(),
            ], 422);
        } catch (\Throwable $e) {
            Log::error('HUNT_STORE_ERROR', [
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

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

    public function update(Request $request, Hunts $hunt): JsonResponse
    {
        try {
            // Vérifier que l'utilisateur est le créateur ou admin
            $user = auth('sanctum')->user();
            if ($hunt->creator_id !== $user->id && !$user->isAdmin()) {
                return response()->json([
                    'error' => 'Forbidden',
                    'message' => 'You are not authorized to update this hunt',
                ], 403);
            }

            $validated = $request->validate([
                'title' => 'sometimes|string|max:255',
                'description' => 'nullable|string',
                'city' => 'sometimes|string|max:255',
                'difficulty' => 'sometimes|string',
                'latitude' => 'nullable|numeric',
                'longitude' => 'nullable|numeric',
                'is_public' => 'boolean',
                'estimated_duration_min' => 'nullable|integer',
                'start_at' => 'nullable|date',
                'end_at' => 'nullable|date|after:start_at',
                'image' => 'nullable|string',
            ]);

            // Update slug if title changed
            if (isset($validated['title']) && $validated['title'] !== $hunt->title) {
                $validated['slug'] = \Illuminate\Support\Str::slug($validated['title']);
                
                // Ensure slug is unique
                $originalSlug = $validated['slug'];
                $counter = 1;
                while (Hunts::where('slug', $validated['slug'])->where('id', '!=', $hunt->id)->exists()) {
                    $validated['slug'] = $originalSlug . '-' . $counter;
                    $counter++;
                }
            }

            $hunt->update($validated);

            Log::info('HUNT_UPDATED', [
                'hunt_id' => $hunt->id,
                'updated_by' => $user->id,
            ]);

            return response()->json($hunt);
        } catch (\Illuminate\Validation\ValidationException $e) {
            return response()->json([
                'error' => 'Validation Error',
                'messages' => $e->errors(),
            ], 422);
        } catch (\Throwable $e) {
            Log::error('HUNT_UPDATE_ERROR', [
                'hunt_id' => $hunt->id ?? null,
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

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

    public function destroy(Hunts $hunt): JsonResponse
    {
        try {
            // Vérifier que l'utilisateur est le créateur ou admin
            $user = auth('sanctum')->user();
            if ($hunt->creator_id !== $user->id && !$user->isAdmin()) {
                return response()->json([
                    'error' => 'Forbidden',
                    'message' => 'You are not authorized to delete this hunt',
                ], 403);
            }

            $huntId = $hunt->id;
            $hunt->delete();

            Log::info('HUNT_DELETED', [
                'hunt_id' => $huntId,
                'deleted_by' => $user->id,
            ]);

            return response()->json([
                'message' => 'Hunt deleted successfully',
            ]);
        } catch (\Throwable $e) {
            Log::error('HUNT_DELETE_ERROR', [
                'hunt_id' => $hunt->id ?? null,
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

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

    public function participate(Hunts $hunt): JsonResponse
    {
        try {
            $user = auth('sanctum')->user();

            // Vérifier si l'utilisateur participe déjà
            if ($hunt->participants()->where('user_id', $user->id)->exists()) {
                return response()->json([
                    'error' => 'Already Participating',
                    'message' => 'You are already participating in this hunt',
                ], 409);
            }

            // Ajouter l'utilisateur comme participant
            $hunt->participants()->attach($user->id, [
                'current_step_number' => 0,
                'status' => 'in_progress',
            ]);

            Log::info('HUNT_PARTICIPATE', [
                'hunt_id' => $hunt->id,
                'user_id' => $user->id,
            ]);

            return response()->json([
                'message' => 'Successfully joined the hunt',
                'hunt' => $hunt->load('participants:id,username,avatar_uri'),
            ]);
        } catch (\Throwable $e) {
            Log::error('HUNT_PARTICIPATE_ERROR', [
                'hunt_id' => $hunt->id ?? null,
                'user_id' => auth('sanctum')->id(),
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

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

    public function unparticipate(Hunts $hunt): JsonResponse
    {
        try {
            $user = auth('sanctum')->user();

            // Vérifier si l'utilisateur participe
            if (!$hunt->participants()->where('user_id', $user->id)->exists()) {
                return response()->json([
                    'error' => 'Not Participating',
                    'message' => 'You are not participating in this hunt',
                ], 404);
            }

            // Retirer l'utilisateur des participants
            $hunt->participants()->detach($user->id);

            Log::info('HUNT_UNPARTICIPATE', [
                'hunt_id' => $hunt->id,
                'user_id' => $user->id,
            ]);

            return response()->json([
                'message' => 'Successfully left the hunt',
            ]);
        } catch (\Throwable $e) {
            Log::error('HUNT_UNPARTICIPATE_ERROR', [
                'hunt_id' => $hunt->id ?? null,
                'user_id' => auth('sanctum')->id(),
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            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(); // chez toi => UUID string

            if ($userId) {
                $escapedUserId = $this->escapeMeiliString((string) $userId);

                if ($participating === true) {
                    // ✅ UUID => string
                    $filters[] = "participant_ids = \"{$escapedUserId}\"";
                } elseif ($participating === false) {
                    $filters[] = "participant_ids != \"{$escapedUserId}\"";
                }
            } elseif ($participating === true) {
                $filters[] = "id < 0";
            }
        }

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

            if ($active === true) {
                // Hunt actif = démarré ET (pas terminé OU pas de date de fin)
                $filters[] = "start_at_timestamp <= {$now}";
                // Meilisearch : la syntaxe est 'field EXISTS' et non 'EXISTS field'
                // Un hunt est actif si end_at_timestamp n'existe pas OU >= now
                $filters[] = "(end_at_timestamp >= {$now} OR NOT end_at_timestamp EXISTS)";
            } elseif ($active === false) {
                // Hunt non actif = pas encore commencé OU (déjà terminé ET a une date de fin)
                // Si pas de end_at_timestamp, le hunt ne peut pas être terminé
                $filters[] = "(start_at_timestamp > {$now} OR (end_at_timestamp < {$now} AND end_at_timestamp EXISTS))";
            }
        }

        // city
        if ($request->filled('city')) {
            $city = $request->query('city');
            if (is_string($city)) {
                $city = $this->escapeMeiliString($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 = "' . $this->escapeMeiliString($d) . '"',
                        $validDifficulties
                    );
                    $filters[] = '(' . implode(' OR ', $difficultyFilters) . ')';
                }
            }
        }

        // dates (UTC)
        $startFrom = $this->parseDateFilterUtc($request->query('start_from'));
        $startTo   = $this->parseDateFilterUtc($request->query('start_to'));
        $endFrom   = $this->parseDateFilterUtc($request->query('end_from'));
        $endTo     = $this->parseDateFilterUtc($request->query('end_to'));

        if ($startFrom) {
            // start_at_timestamp est toujours présent (created_at par défaut), donc pas besoin de EXISTS
            $filters[] = "start_at_timestamp >= {$startFrom->timestamp}";
        }
        if ($startTo) {
            // start_at_timestamp est toujours présent
            $filters[] = "start_at_timestamp <= {$startTo->timestamp}";
        }
        if ($endFrom) {
            // end_at_timestamp peut être null, donc on vérifie qu'il existe avant de comparer
            $filters[] = "(end_at_timestamp EXISTS AND end_at_timestamp >= {$endFrom->timestamp})";
        }
        if ($endTo) {
            // end_at_timestamp peut être null, donc on vérifie qu'il existe avant de comparer
            $filters[] = "(end_at_timestamp EXISTS AND end_at_timestamp <= {$endTo->timestamp})";
        }

        // Filtre par défaut : si aucun filtre n'est spécifié, afficher uniquement les hunts publics
        // Cela évite l'erreur Meilisearch avec une chaîne de filtres vide
        if (empty($filters)) {
            // En Meilisearch, les booléens peuvent être comparés avec true/false (sans guillemets)
            $filters[] = "is_public = true";
        }

        $finalFilters = implode(' AND ', $filters);

        Log::info('BUILD_FILTERS_COMPLETE', [
            'final_filters' => $finalFilters,
        ]);

        return $finalFilters;
    }

    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;
    }

    private function parseDateFilterUtc(mixed $value): ?Carbon
    {
        if (!is_string($value) || trim($value) === '') {
            return null;
        }

        try {
            return Carbon::parse(trim($value))->utc();
        } catch (\Throwable $e) {
            return null;
        }
    }

    private function escapeMeiliString(string $value): string
    {
        // Échappe les backslashes et les guillemets pour une string Meilisearch
        $value = str_replace('\\', '\\\\', $value);
        return str_replace('"', '\"', $value);
    }
}