<?php

namespace App\Services\Web;

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

/**
 * Kursdaten für den Ad-Hoc-Ticker der Web-Frontends.
 *
 * refresh() fragt die konfigurierten Symbole (config/market.php) über die
 * Yahoo-Finance-Chart-API ab und legt sie in den Cache; die Views lesen nur
 * aus dem Cache (slides()). Schlägt der Abruf für alle Symbole fehl, bleibt
 * der bestehende Cache-Stand erhalten, damit ein API-Ausfall die Anzeige
 * nicht sofort leert.
 */
class MarketDataService
{
    /**
     * @return list<array{label: string, value: string, delta: string, positive: bool}>
     */
    public function slides(): array
    {
        if (! config('market.enabled')) {
            return [];
        }

        /** @var list<array{label: string, value: string, delta: string, positive: bool}> $slides */
        $slides = Cache::get((string) config('market.cache_key'), []);

        return is_array($slides) ? $slides : [];
    }

    /**
     * @return list<array{label: string, value: string, delta: string, positive: bool}>
     */
    public function refresh(): array
    {
        $slides = [];

        foreach ((array) config('market.symbols', []) as $config) {
            $quote = $this->fetchQuote((string) $config['symbol']);

            if ($quote === null) {
                continue;
            }

            [$price, $previousClose] = $quote;

            $deltaPercent = $previousClose > 0.0
                ? ($price - $previousClose) / $previousClose * 100
                : 0.0;

            $slides[] = [
                'label' => (string) $config['label'],
                'value' => number_format($price, (int) ($config['precision'] ?? 2), ',', '.').($config['suffix'] ?? ''),
                'delta' => ($deltaPercent >= 0 ? '+' : '').number_format($deltaPercent, 1, ',', '.').'%',
                'positive' => $deltaPercent >= 0,
            ];
        }

        if ($slides === []) {
            Log::warning('market:refresh lieferte keine Kursdaten — bestehender Cache-Stand bleibt erhalten.');

            return $this->slides();
        }

        Cache::put((string) config('market.cache_key'), $slides, (int) config('market.cache_ttl', 86400));

        return $slides;
    }

    /**
     * @return array{0: float, 1: float}|null [Kurs, Vortagesschluss]
     */
    private function fetchQuote(string $symbol): ?array
    {
        try {
            $response = Http::timeout(10)
                ->withHeaders(['User-Agent' => 'Mozilla/5.0 (compatible; PressekontoTicker/1.0)'])
                ->get(config('market.endpoint').rawurlencode($symbol), [
                    'range' => '1d',
                    'interval' => '1d',
                ]);
        } catch (\Throwable $exception) {
            Log::warning('Kursabruf fehlgeschlagen.', ['symbol' => $symbol, 'error' => $exception->getMessage()]);

            return null;
        }

        if (! $response->successful()) {
            Log::warning('Kursabruf fehlgeschlagen.', ['symbol' => $symbol, 'status' => $response->status()]);

            return null;
        }

        $meta = $response->json('chart.result.0.meta');

        $price = $meta['regularMarketPrice'] ?? null;
        $previousClose = $meta['chartPreviousClose'] ?? $meta['previousClose'] ?? null;

        if (! is_numeric($price) || ! is_numeric($previousClose)) {
            return null;
        }

        return [(float) $price, (float) $previousClose];
    }
}