<?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;
        $config = app(ConfigService::class);

        // no_quote صفر را روی مظنهٔ معتبر قبلی ننویس — قطع فید لحظه‌ای نباید UI را خالی کند
        $incomingEmpty = ! $config->payloadHasDisplayablePrice($body)
            && (string) ($body['status'] ?? '') === 'no_quote';
        $existingGood = is_array($cachedBody) && $config->payloadHasDisplayablePrice($cachedBody);
        if ($incomingEmpty && $existingGood) {
            Cache::put(self::FULL_RESPONSE_KEY, [
                'body' => $cachedBody,
                'stored_at' => now(),
            ], now()->addSeconds(self::TTL_SECONDS + 5));

            return $cachedBody;
        }

        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;
        }

        $this->storeBody($body);

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

        app(PriceChannelBroadcastService::class)->scheduleBroadcastIfEligible();

        return $body;
    }

    /**
     * بازنویسی کش last بدون گیت هویت — برای اعمال فوری ساعت کاری.
     *
     * @param  array<string, mixed>  $body
     * @return array<string, mixed>
     */
    public function replaceBody(array $body): array
    {
        $this->storeBody($body);

        return $body;
    }

    /**
     * @param  array<string, mixed>  $body
     */
    private function storeBody(array $body): void
    {
        Cache::put(self::FULL_RESPONSE_KEY, [
            'body' => $body,
            'stored_at' => now(),
        ], now()->addSeconds(self::TTL_SECONDS + 5));

        app(ProductDisplayPriceService::class)->cacheLivePricePayload($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 — از montzar_live_price / آخرین ردیف prices */
    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();

        $montzarSource = 0;
        $zaarboxSource = 0;
        $mainProductSource = 0;
        $priceSource = 'database_last';

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

        // قبلاً فقط به جدول prices نگاه می‌کرد؛ اگر خالی بود SSE همان لحظه no_quote صفر
        // می‌فرستاد و UI مظنهٔ معتبر HTTP را پاک می‌کرد — در حالی که montzar_live_price پر بود.
        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',
                'price_source' => '',
                'time' => now(),
            ];
        } else {
            $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',
                'price_source' => $priceSource,
                'time' => now(),
            ];
        }

        $payload['last_historical'] = $display->resolveHistoricalBasePrice();

        $payload = $config->applyGlobalTradingHoursToPayload($payload);

        $extremes = $config->resolvedDailyBaseExtremes();
        $payload['up'] = ($payload['status'] ?? 'open') !== 'open'
            ? ['sell' => 0, 'buy' => 0]
            : ($extremes['up'] > 0
                ? [
                    'sell' => max(0, (int) ceil($extremes['down'] - $config->displaySellPriceDiffRial())),
                    'buy' => (int) ceil($extremes['up'] + $config->displayBuyPriceDiffRial()),
                ]
                : ['sell' => $payload['sell'] ?? 0, 'buy' => $payload['buy'] ?? 0]);

        return app(ZaarboxPriceService::class)->attachGoldOunceToPayload($payload);
    }
}