<?php

namespace App\Http\Controllers\Web;

use App\Http\Controllers\Controller;
use App\Models\Character;
use App\Models\City;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;

/**
 * Lightweight multiplayer presence feed.
 *
 * Returns the positions and states of characters active in a city so the
 * viewer can render other citizens in near-real-time without WebSockets.
 */
class CityPresenceController extends Controller
{
    /**
     * Snapshot of citizens in the requested (or default) city.
     */
    public function __invoke(Request $request): JsonResponse
    {
        $user = $request->user();
        abort_unless($user !== null, 401);

        $me = Character::ensureForUser($user);
        $slug = $request->query('city');
        $city = $me->city;
        if (is_string($slug) && $slug !== '') {
            $city = City::query()
                ->where('slug', $slug)
                ->orWhere('id', ctype_digit($slug) ? (int) $slug : 0)
                ->first() ?? $city;
        }

        // Rows are shared across users for one second, so is_me must NOT
        // be baked into the cached payload — it is computed per viewer
        // below (otherwise user B sees user A's is_me flags and could see
        // their own character as a remote citizen).
        $cacheKey = 'presence.'.$city->id.'.'.now()->timestamp;
        $citizens = Cache::remember($cacheKey, 1, function () use ($city) {
            return Character::query()
                ->where('city_id', $city->id)
                ->where(function ($q): void {
                    $q->where('is_online', true)
                        ->orWhere('updated_at', '>=', now()->subMinutes(10));
                })
                ->with('user:id,name')
                ->get()
                ->map(fn (Character $c): array => [
                    'id' => $c->id,
                    'name' => $c->name,
                    'type' => $c->user_id === null ? 'child' : 'citizen',
                    'status' => $c->state,
                    'position' => [(float) $c->pos_x, (float) $c->pos_y, (float) $c->pos_z],
                    'is_online' => (bool) $c->is_online,
                    'owner_name' => $c->user?->name,
                ])
                ->values()
                ->all();
        });

        $viewerId = (int) $me->id;
        $citizens = array_map(
            static fn (array $c): array => $c + ['is_me' => (int) $c['id'] === $viewerId],
            $citizens
        );

        return response()->json([
            'city_id' => $city->id,
            'server_time' => now()->toIso8601String(),
            'citizens' => $citizens,
        ])->header('Cache-Control', 'no-store');
    }
}