<?php

namespace App\Services;

use App\Models\Price;
use Illuminate\Support\Facades\Cache;

class LivePriceCacheService
{
    public const FULL_RESPONSE_KEY = 'live_price_full_response';

    public const TTL_SECONDS = 15;

    public function get(): ?array
    {
        $cached = Cache::get(self::FULL_RESPONSE_KEY);
        if (! is_array($cached) || ! isset($cached['body'], $cached['stored_at'])) {
            return null;
        }

        if (now()->diffInSeconds($cached['stored_at']) > self::TTL_SECONDS) {
            return null;
        }

        return $cached['body'];
    }

    public function put(array $body): array
    {
        Cache::put(self::FULL_RESPONSE_KEY, [
            'body' => $body,
            'stored_at' => now(),
        ], now()->addSeconds(self::TTL_SECONDS + 5));

        app(ProductDisplayPriceService::class)->cacheLivePricePayload($body);

        return $body;
    }

    /** پاسخ سریع بدون API خارجی — از آخرین رکورد prices + تنظیمات */
    public function buildFromDatabase(): array
    {
        $config = app(ConfigService::class);
        $display = app(ProductDisplayPriceService::class);
        $last = Price::orderByDesc('id')->first();
        $base = $last ? (int) $last->price : 0;
        $provider = $config->priceProvider();

        $montzarPrice = 0;
        $zaarboxPrice = 0;
        $mainProductPrice = 0;

        if ($base <= 0) {
            $payload = [
                'sell' => 0,
                'buy' => 0,
                'price_last' => 0,
                'price' => 0,
                'main_product' => 0,
                'montzar' => 0,
                'zaarbox' => 0,
                'closed' => true,
                'time' => now(),
            ];
        } else {
            $diffBuy = (int) $config->displayBuySpreadRial();
            $diffSell = (int) $config->displaySellSpreadRial();
            $openBuy = true;
            $openSell = true;

            if ($provider === 'montzar') {
                $montzarPrice = $config->getInt('montzar_live_price', 0) ?: $base;
                $montzarDiff = (int) $config->getInt('montzar_diff', 0);
                $diffBuy += $montzarDiff;
                $diffSell += $montzarDiff;
                $openBuy = $config->getBool('montzar_open_buy', true);
                $openSell = $config->getBool('montzar_open_sell', true);
            } elseif ($provider === 'zaarbox') {
                $zaarboxPrice = $base;
            } elseif ($provider === 'main_product') {
                $mainProductPrice = $base;
            }

            $buy = $openBuy ? (int) ceil($base + $diffBuy) : 0;
            $sell = $openSell ? max(0, (int) ceil($base - $diffSell)) : 0;

            $payload = [
                'sell' => $sell,
                'buy' => $buy,
                'price_last' => $buy,
                'price' => $base,
                'main_product' => $mainProductPrice,
                'montzar' => $montzarPrice,
                'zaarbox' => $zaarboxPrice,
                'closed' => false,
                'time' => now(),
            ];
        }

        $payload['up'] = $config->resolvedDailyBaseExtremes()['up'] > 0
            ? [
                'sell' => max(0, (int) ceil($config->resolvedDailyBaseExtremes()['down'] - $config->displaySellSpreadRial())),
                'buy' => (int) ceil($config->resolvedDailyBaseExtremes()['up'] + $config->displayBuySpreadRial()),
            ]
            : ['sell' => $payload['sell'] ?? 0, 'buy' => $payload['buy'] ?? 0];
        $payload['last_historical'] = $display->resolveHistoricalBasePrice();

        $display->cacheLivePricePayload($payload);

        return $payload;
    }
}