<?php

namespace App\Services;

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

/**
 * قیمت نمایشی محصولات آبشده با منبع «قیمت اپ» — در DB صفر است، برای API پر می‌شود.
 */
class ProductDisplayPriceService
{
    public const LIVE_PRICE_CACHE_KEY = 'live_price_api_payload';

    public const LIVE_PRICE_CACHE_SECONDS = 15;

    public function usesAppPrice(Product $product): bool
    {
        if ($product->reading_method) {
            return false;
        }

        if ((int) ($product->direct_price ?? 0) === 1) {
            return false;
        }

        return $this->isMeltedTradeProduct($product);
    }

    public function enrichForApi(Collection|iterable $products): void
    {
        $needsLivePrice = false;

        foreach ($products as $product) {
            if ($product instanceof Product && $this->usesAppPrice($product)) {
                $needsLivePrice = true;
                break;
            }
        }

        if (!$needsLivePrice) {
            return;
        }

        $basePrice = $this->resolveAppBasePrice();
        if ($basePrice <= 0) {
            return;
        }

        foreach ($products as $product) {
            if (!$product instanceof Product || !$this->usesAppPrice($product)) {
                continue;
            }

            $offset = Product::hasPriceOffsetColumn()
                ? (float) ($product->price_offset_percent ?? 0)
                : 0.0;

            $computed = ProductPriceService::adjustedTotal($basePrice, 0, $offset);
            if ($computed <= 0) {
                continue;
            }

            $product->setAttribute('price', $computed);
            if (\Illuminate\Support\Facades\Schema::hasColumn($product->getTable(), 'price_profit')) {
                $product->setAttribute('price_profit', 0);
            }
        }
    }

    /** @param array<string, mixed> $payload */
    public function cacheLivePricePayload(array $payload): void
    {
        Cache::put(self::LIVE_PRICE_CACHE_KEY, [
            'price' => (int) ($payload['price'] ?? 0),
            'buy' => (int) ($payload['buy'] ?? 0),
            'sell' => (int) ($payload['sell'] ?? 0),
            'price_last' => (int) ($payload['price_last'] ?? 0),
        ], now()->addSeconds(self::LIVE_PRICE_CACHE_SECONDS));
    }

    public function resolveAppBasePrice(): int
    {
        $payload = $this->livePricePayload();

        $price = (int) ($payload['price'] ?? 0);
        if ($price > 0) {
            return $price;
        }

        $buy = (int) ($payload['buy'] ?? 0);
        $sell = (int) ($payload['sell'] ?? 0);
        if ($buy > 0 && $sell > 0) {
            return (int) round(($buy + $sell) / 2);
        }

        return (int) ($payload['price_last'] ?? 0);
    }

    /** @return array{price: int, buy: int, sell: int, price_last: int} */
    private function livePricePayload(): array
    {
        $cached = Cache::get(self::LIVE_PRICE_CACHE_KEY);
        if (is_array($cached)) {
            return $cached;
        }

        return $this->resolveFallbackPayload();
    }

    /** @return array{price: int, buy: int, sell: int, price_last: int} */
    private function resolveFallbackPayload(): array
    {
        $config = app(ConfigService::class);
        $provider = $config->priceProvider();
        $price = 0;

        if ($provider === 'montzar') {
            $price = $config->getInt('montzar_live_price', 0);
        } elseif ($provider === 'zaarbox') {
            $zaarbox = app(ZaarboxPriceService::class)->fetchPrice();
            $price = (int) ($zaarbox['order_price'] ?? 0);
        } elseif ($provider === 'main_product') {
            $main = $config->mainProduct();
            if ($main) {
                $price = (int) (($main->price ?? 0) + ($main->price_profit ?? 0));
            }
        } elseif ($provider === 'taban_gohar') {
            $price = $config->getInt('taban_gohar_live_price', 0);
        }

        if ($price <= 0) {
            $last = Price::orderByDesc('id')->first();
            if ($last && (float) $last->price > 0) {
                $price = (int) $last->price;
            }
        }

        $diffBuy = (int) $config->displayBuySpreadRial();
        $diffSell = (int) $config->displaySellSpreadRial();

        return [
            'price' => $price,
            'buy' => $price > 0 ? $price + $diffBuy : 0,
            'sell' => $price > 0 ? max(0, $price - $diffSell) : 0,
            'price_last' => $price > 0 ? $price + $diffBuy : 0,
        ];
    }

    private function isMeltedTradeProduct(Product $product): bool
    {
        $group = trim((string) ($product->group_type ?? ''));

        return in_array($group, ['آبشده', 'کاتد مس'], true);
    }
}