<?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 LAST_TICK_KEY = 'live_price_last_tick_at';

    /** هم‌تراز با کران ۱۰ ثانیه‌ای */
    public const TTL_SECONDS = 10;

    /** اگر tick اخیر نباشد، buildFromDatabase قیمت را قفل می‌کند */
    public const TICK_MAX_AGE_SECONDS = 20;

    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
    {
        $cached = Cache::get(self::FULL_RESPONSE_KEY);
        $cachedBody = is_array($cached['body'] ?? null) ? $cached['body'] : null;

        if ($cachedBody !== null && PriceBroadcastService::lastPriceIdentity($cachedBody) === PriceBroadcastService::lastPriceIdentity($body)) {
            Cache::put(self::FULL_RESPONSE_KEY, [
                'body' => $cachedBody,
                'stored_at' => now(),
            ], now()->addSeconds(self::TTL_SECONDS + 5));

            return $cachedBody;
        }

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

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

        app(PriceBroadcastService::class)->broadcastLastIfChanged($body);

        return $body;
    }

    public function markTick(): void
    {
        Cache::put(self::LAST_TICK_KEY, now(), now()->addMinutes(10));
    }

    public function hasRecentTick(): bool
    {
        $lastTick = Cache::get(self::LAST_TICK_KEY);
        if ($lastTick === null) {
            return false;
        }

        return now()->diffInSeconds($lastTick) <= self::TICK_MAX_AGE_SECONDS;
    }

    /** پاسخ سریع بدون API خارجی — فقط وقتی کران اخیراً tick زده (همان فرمول lastPrice) */
    public function buildFromDatabase(): array
    {
        $config = app(ConfigService::class);
        $display = app(ProductDisplayPriceService::class);
        $last = Price::orderByDesc('id')->first();
        $base = $last ? (float) $last->price : 0.0;
        $provider = $config->priceProvider();

        if ($base <= 0) {
            $payload = [
                'sell' => 0,
                'buy' => 0,
                'price_last' => 0,
                'price' => 0,
                'main_product' => 0,
                'montzar' => 0,
                'zaarbox' => 0,
                'closed' => false,
                'status' => 'no_quote',
                'time' => now(),
            ];
        } else {
            $montzarSource = 0;
            $zaarboxSource = 0;
            $mainProductSource = 0;
            $priceSource = 'database_last';

            if ($provider === 'montzar') {
                $liveMontzar = (float) $config->get('montzar_live_price', 0);
                if ($liveMontzar > 0) {
                    $base = $liveMontzar;
                }
                $montzarSource = (int) ($liveMontzar > 0 ? $liveMontzar : $base);
                $priceSource = 'montzar';
            } elseif ($provider === 'zaarbox') {
                $zaarboxSource = (int) $base;
            } elseif ($provider === 'main_product') {
                $mainProductSource = (int) $base;
            }

            $trade = $config->buildTradeDisplayPrices($base, $priceSource);

            $payload = [
                'sell' => $trade['sell'],
                'buy' => $trade['buy'],
                'price_last' => $trade['priceLast'],
                'price' => (int) $base,
                'main_product' => $mainProductSource,
                'montzar' => $montzarSource,
                'zaarbox' => $zaarboxSource,
                'closed' => false,
                'status' => 'open',
                '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();

        return $payload;
    }
}