using System.Security.Cryptography;
using System.Text;
using AssetManager.Data;
using Microsoft.Extensions.Logging;
using SqlSugar;

namespace AssetManager.Data.Repositories;

/// <summary>
/// 市场数据仓储实现
/// </summary>
public class MarketDataRepository : IMarketDataRepository
{
    private readonly ISqlSugarClient _db;
    private readonly ILogger<MarketDataRepository> _logger;

    public MarketDataRepository(ISqlSugarClient db, ILogger<MarketDataRepository> logger)
    {
        _db = db;
        _logger = logger;
    }

    // ===== 价格缓存 =====

    public async Task<MarketPriceCache?> GetPriceCacheAsync(string symbol, string assetType)
    {
        var cacheKey = GenerateCacheKey(symbol, assetType);
        _logger.LogDebug("[缓存查询] CacheKey={CacheKey}, Symbol={Symbol}, AssetType={AssetType}", cacheKey, symbol, assetType);
        
        try
        {
            var result = await _db.Queryable<MarketPriceCache>()
                .Where(p => p.Id == cacheKey && p.ExpiredAt > DateTime.Now)
                .FirstAsync();
            
            if (result != null)
            {
                _logger.LogDebug("[缓存查询成功] CacheKey={CacheKey}, Price={Price}, ExpiredAt={ExpiredAt}", cacheKey, result.Price, result.ExpiredAt);
            }
            else
            {
                _logger.LogDebug("[缓存查询无结果] CacheKey={CacheKey}", cacheKey);
            }
            
            return result;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "[缓存查询异常] CacheKey={CacheKey}", cacheKey);
            return null;
        }
    }

    public async Task<bool> SavePriceCacheAsync(MarketPriceCache cache)
    {
        cache.Id = GenerateCacheKey(cache.Symbol, cache.AssetType);
        
        // 使用新的 SqlSugarClient 实例，避免并发写入时连接冲突
        // 连接池会复用底层连接，性能开销很小
        using var db = SqlSugarConfig.GetSqlSugarClient();
        var result = await db.Storageable(cache).ExecuteCommandAsync();
        return result > 0;
    }

    // ===== K线缓存 =====

    public async Task<List<MarketKlineCache>> GetKlineCacheAsync(string symbol, string assetType, string timeframe, int limit)
    {
        return await _db.Queryable<MarketKlineCache>()
            .Where(k => k.Symbol == symbol.ToUpper() 
                     && k.AssetType == assetType.ToUpper() 
                     && k.Timeframe == timeframe.ToUpper())
            .OrderByDescending(k => k.Timestamp)
            .Take(limit)
            .ToListAsync();
    }

    public async Task<bool> SaveKlineCacheBatchAsync(List<MarketKlineCache> cacheList)
    {
        if (cacheList == null || cacheList.Count == 0) return false;

        // 为每条记录生成唯一ID
        foreach (var cache in cacheList)
        {
            cache.Id = GenerateKlineCacheKey(cache.Symbol, cache.AssetType, cache.Timeframe, cache.Timestamp);
        }

        var result = await _db.Storageable(cacheList)
            .WhereColumns(it => new { it.Id })
            .ExecuteCommandAsync();
        
        return result > 0;
    }

    // ===== Tiingo Ticker =====

    public async Task<TiingoTicker?> GetTiingoTickerAsync(string symbol)
    {
        return await _db.Queryable<TiingoTicker>()
            .Where(t => t.Ticker == symbol.ToUpper())
            .FirstAsync();
    }

    public async Task<bool> SaveTiingoTickerAsync(TiingoTicker ticker)
    {
        var result = await _db.Storageable(ticker)
            .WhereColumns(it => new { it.Ticker })
            .ExecuteCommandAsync();
        return result > 0;
    }

    public async Task<List<TiingoTicker>> SearchTiingoTickersAsync(string keyword, int limit)
    {
        var keywordUpper = keyword.ToUpper();
        return await _db.Queryable<TiingoTicker>()
            .Where(t => t.Ticker != null && t.Ticker.Contains(keywordUpper) || 
                        (t.Name != null && t.Name.Contains(keyword)))
            .Take(limit)
            .ToListAsync();
    }

    // ===== 私有辅助方法 =====

    private string GenerateCacheKey(string symbol, string assetType)
    {
        return GenerateMd5Hash($"{symbol.ToUpper()}_{assetType.ToUpper()}");
    }

    private string GenerateKlineCacheKey(string symbol, string assetType, string timeframe, DateTime timestamp)
    {
        return GenerateMd5Hash($"{symbol.ToUpper()}_{assetType.ToUpper()}_{timeframe.ToUpper()}_{timestamp:yyyyMMddHHmmss}");
    }

    private string GenerateMd5Hash(string input)
    {
        using var md5 = MD5.Create();
        var inputBytes = Encoding.UTF8.GetBytes(input);
        var hashBytes = md5.ComputeHash(inputBytes);
        var sb = new StringBuilder();
        foreach (var b in hashBytes)
        {
            sb.Append(b.ToString("x2"));
        }
        return sb.ToString();
    }
}