<?php

namespace app\common\service\crypto;

use app\common\service\ConfigService;
use RuntimeException;
use think\facade\Cache;
use think\facade\Log;

class CryptoMarketService
{
    private const CACHE_KEY = 'crypto_market_snapshot';
    private const STALE_CACHE_KEY = 'crypto_market_snapshot_stale';

    public static function snapshot(): array
    {
        $cached = Cache::get(self::CACHE_KEY);
        if (self::isValidSnapshot($cached)) {
            return $cached;
        }

        try {
            $snapshot = self::fetchSnapshot();
            $cacheSeconds = max(30, min(300, (int) ConfigService::get('crypto_market', 'cache_seconds', 60)));
            Cache::set(self::CACHE_KEY, $snapshot, $cacheSeconds);
            Cache::set(self::STALE_CACHE_KEY, $snapshot, 86400);
            return $snapshot;
        } catch (\Throwable $e) {
            Log::error('[CryptoMarket] fetch failed: ' . $e->getMessage());
            $stale = Cache::get(self::STALE_CACHE_KEY);
            if (self::isValidSnapshot($stale)) {
                $stale['stale'] = true;
                return $stale;
            }
            throw new RuntimeException('行情数据暂时不可用');
        }
    }

    public static function supportedSymbols(): array
    {
        return array_values(array_unique(array_column(self::coinConfig(), 'symbol')));
    }

    public static function isSupportedSymbol(string $symbol): bool
    {
        return in_array(strtoupper(trim($symbol)), self::supportedSymbols(), true);
    }

    private static function fetchSnapshot(): array
    {
        $coinConfig = self::coinConfig();
        if (empty($coinConfig)) {
            throw new RuntimeException('加密行情币种配置不存在');
        }

        $apiBase = rtrim((string) ConfigService::get(
            'crypto_market',
            'api_base',
            'https://api.coingecko.com/api/v3'
        ), '/');
        $ids = array_column($coinConfig, 'id');
        $marketUrl = $apiBase . '/coins/markets?' . http_build_query([
            'vs_currency' => 'cny',
            'ids' => implode(',', $ids),
            'order' => 'market_cap_desc',
            'per_page' => max(1, count($ids)),
            'page' => 1,
            'sparkline' => 'false',
            'price_change_percentage' => '24h',
        ]);

        $marketRows = self::requestJson($marketUrl);
        $global = self::requestJson($apiBase . '/global');
        $globalData = is_array($global['data'] ?? null) ? $global['data'] : [];
        $configById = [];
        foreach ($coinConfig as $item) {
            $configById[$item['id']] = $item;
        }

        $coins = [];
        foreach ($marketRows as $row) {
            $id = (string) ($row['id'] ?? '');
            if (!isset($configById[$id])) {
                continue;
            }
            $meta = $configById[$id];
            $coins[] = [
                'id' => $id,
                'symbol' => $meta['symbol'],
                'name' => (string) ($row['name'] ?? $meta['symbol']),
                'name_zh' => $meta['name_zh'] ?: (string) ($row['name'] ?? $meta['symbol']),
                'image' => (string) ($row['image'] ?? ''),
                'current_price' => (float) ($row['current_price'] ?? 0),
                'market_cap' => (float) ($row['market_cap'] ?? 0),
                'market_cap_rank' => (int) ($row['market_cap_rank'] ?? 0),
                'total_volume' => (float) ($row['total_volume'] ?? 0),
                'price_change_percentage_24h' => round((float) ($row['price_change_percentage_24h'] ?? 0), 2),
            ];
        }

        if (empty($coins)) {
            throw new RuntimeException('CoinGecko 未返回有效行情');
        }

        $updatedAt = (int) ($globalData['updated_at'] ?? time());
        return [
            'updated_at' => $updatedAt,
            'updated_time' => date('H:i', $updatedAt),
            'stale' => false,
            'overview' => [
                'btc_market_cap_percentage' => round((float) ($globalData['market_cap_percentage']['btc'] ?? 0), 1),
                'total_volume_cny' => (float) ($globalData['total_volume']['cny'] ?? 0),
            ],
            'coins' => $coins,
        ];
    }

    private static function coinConfig(): array
    {
        $config = ConfigService::get('crypto_market', 'coins', []);
        if (!is_array($config)) {
            return [];
        }

        $coins = [];
        foreach ($config as $item) {
            if (!is_array($item)) {
                continue;
            }
            $id = strtolower(trim((string) ($item['id'] ?? '')));
            $symbol = strtoupper(trim((string) ($item['symbol'] ?? '')));
            if (!preg_match('/^[a-z0-9-]+$/', $id) || !preg_match('/^[A-Z0-9]{2,20}$/', $symbol)) {
                continue;
            }
            $coins[] = [
                'id' => $id,
                'symbol' => $symbol,
                'name_zh' => trim((string) ($item['name_zh'] ?? '')),
            ];
        }
        return $coins;
    }

    private static function requestJson(string $url): array
    {
        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 15,
            CURLOPT_CONNECTTIMEOUT => 5,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_ENCODING => '',
            CURLOPT_HTTPHEADER => [
                'Accept: application/json',
                'User-Agent: SportEra/1.0',
            ],
        ]);
        $body = curl_exec($ch);
        $httpCode = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);

        if ($error !== '') {
            throw new RuntimeException($error);
        }
        if ($httpCode !== 200) {
            throw new RuntimeException('CoinGecko HTTP ' . $httpCode);
        }

        $data = json_decode((string) $body, true);
        if (!is_array($data)) {
            throw new RuntimeException('CoinGecko 返回格式异常');
        }
        return $data;
    }

    private static function isValidSnapshot($snapshot): bool
    {
        return is_array($snapshot)
            && !empty($snapshot['coins'])
            && is_array($snapshot['coins'])
            && is_array($snapshot['overview'] ?? null);
    }
}