<?php

namespace App\Services;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class WeatherService
{
    /**
     * Open-Meteo Weather Code Mapping → [description, icon-key]
     * Icons werden im Blade als inline SVG anhand des Keys gerendert.
     */
    protected const CODES = [
        0  => ['Klar', 'sun'],
        1  => ['Überwiegend klar', 'sun'],
        2  => ['Teilweise bewölkt', 'cloud-sun'],
        3  => ['Bedeckt', 'cloud'],
        45 => ['Nebel', 'fog'],
        48 => ['Reifnebel', 'fog'],
        51 => ['Leichter Nieselregen', 'drizzle'],
        53 => ['Nieselregen', 'drizzle'],
        55 => ['Starker Nieselregen', 'drizzle'],
        61 => ['Leichter Regen', 'rain'],
        63 => ['Regen', 'rain'],
        65 => ['Starker Regen', 'rain'],
        71 => ['Leichter Schnee', 'snow'],
        73 => ['Schnee', 'snow'],
        75 => ['Starker Schnee', 'snow'],
        77 => ['Schneegriesel', 'snow'],
        80 => ['Regenschauer', 'rain'],
        81 => ['Regenschauer', 'rain'],
        82 => ['Heftige Regenschauer', 'rain'],
        85 => ['Schneeschauer', 'snow'],
        86 => ['Heftige Schneeschauer', 'snow'],
        95 => ['Gewitter', 'storm'],
        96 => ['Gewitter mit Hagel', 'storm'],
        99 => ['Schweres Gewitter', 'storm'],
    ];

    /**
     * @return array{temperature: float|null, city: string, icon: string, description: string, fetched_at: ?string}
     */
    public function fetch(): array
    {
        $lat = (float) config('services.weather.lat', env('FOX_LAT', 48.2082));
        $lon = (float) config('services.weather.lon', env('FOX_LON', 16.3738));
        $city = (string) config('services.weather.city', env('FOX_CITY', 'Wien'));

        $cacheKey = sprintf('fox.weather.%s.%s', $lat, $lon);

        return Cache::remember($cacheKey, now()->addMinutes(10), function () use ($lat, $lon, $city) {
            try {
                $response = Http::timeout(8)->get('https://api.open-meteo.com/v1/forecast', [
                    'latitude' => $lat,
                    'longitude' => $lon,
                    'current' => 'temperature_2m,weathercode',
                    'timezone' => 'auto',
                ]);

                if (! $response->successful()) {
                    return $this->fallback($city);
                }

                $temp = $response->json('current.temperature_2m');
                $code = (int) $response->json('current.weathercode', 0);
                [$description, $icon] = self::CODES[$code] ?? ['Unbekannt', 'cloud'];

                return [
                    'temperature' => $temp !== null ? round((float) $temp, 1) : null,
                    'city' => $city,
                    'icon' => $icon,
                    'description' => $description,
                    'fetched_at' => now()->toIso8601String(),
                ];
            } catch (\Throwable $e) {
                Log::warning('WeatherService failed', ['error' => $e->getMessage()]);

                return $this->fallback($city);
            }
        });
    }

    protected function fallback(string $city): array
    {
        return [
            'temperature' => null,
            'city' => $city,
            'icon' => 'cloud',
            'description' => 'Keine Daten',
            'fetched_at' => null,
        ];
    }
}