AssetManager.API/AssetManager.Services/PortfolioService.cs

using AssetManager.Data;
using AssetManager.Models.DTOs;
using AssetManager.Infrastructure.Services;
using SqlSugar;
using Microsoft.Extensions.Logging;

namespace AssetManager.Services;

public class PortfolioService : IPortfolioService
{
    private readonly ISqlSugarClient _db;
    private readonly IMarketDataService _marketDataService;
    private readonly IExchangeRateService _exchangeRateService;
    private readonly IPortfolioNavService _navService;
    private readonly ILogger<PortfolioService> _logger;

    public PortfolioService(
        ISqlSugarClient db, 
        IMarketDataService marketDataService, 
        IExchangeRateService exchangeRateService,
        IPortfolioNavService navService,
        ILogger<PortfolioService> logger)
    {
        _db = db;
        _marketDataService = marketDataService;
        _exchangeRateService = exchangeRateService;
        _navService = navService;
        _logger = logger;
    }

    public CreatePortfolioResponse CreatePortfolio(CreatePortfolioRequest request, string userId)
    {
        var portfolio = new Portfolio
        {
            Id = "port-" + Guid.NewGuid().ToString().Substring(0, 8),
            UserId = userId,
            StrategyId = request.StrategyId,
            Name = request.Name,
            Currency = request.Currency,
            TotalValue = (decimal)(request.Stocks?.Sum(s => s.Price * s.Amount) ?? 0),
            ReturnRate = 0,
            Status = "运行中",
            CreatedAt = DateTime.Now,
            UpdatedAt = DateTime.Now
        };

        _db.Insertable(portfolio).ExecuteCommand();

        // 如果选择了策略，自动加载策略配置的标的作为初始持仓
        var strategyStocks = new List<StockItem>();
        if (!string.IsNullOrEmpty(request.StrategyId))
        {
            var Strategy = _db.Queryable<Strategy>()
                .Where(s => s.Id == request.StrategyId && s.UserId == userId)
                .First();
            
            if (Strategy != null && !string.IsNullOrEmpty(Strategy.Config))
            {
                try
                {
                    // 风险平价策略
                    if (Strategy.Type?.Equals("risk_parity", StringComparison.OrdinalIgnoreCase) == true)
                    {
                        // 处理可能的双层转义
                        string configJson = Strategy.Config;
                        if (configJson.StartsWith("\"") && configJson.EndsWith("\""))
                        {
                            // 去掉外层的引号和转义
                            configJson = System.Text.Json.JsonSerializer.Deserialize<string>(configJson);
                        }
                        var config = System.Text.Json.JsonSerializer.Deserialize<RiskParityConfig>(configJson);
                        if (config?.Assets != null)
                        {
                            foreach (var asset in config.Assets)
                            {
                                if (!string.IsNullOrEmpty(asset.Symbol))
                                {
                                    strategyStocks.Add(new StockItem
                                    {
                                        Code = asset.Symbol,
                                        Name = asset.Symbol,
                                        Price = 0, // 价格留空，用户后续填写
                                        Amount = 0, // 数量留空，用户后续填写
                                        Currency = request.Currency,
                                        AssetType = "Stock"
                                    });
                                }
                            }
                        }
                    }
                    // 其他策略类型可以在这里扩展
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "解析策略配置失败，策略ID: {StrategyId}", request.StrategyId);
                }
            }
        }

        // 合并用户传入的持仓和策略自动生成的持仓
        var allStocks = (request.Stocks ?? new List<StockItem>()).Concat(strategyStocks).DistinctBy(s => s.Code).ToList();

        // 创建初始持仓
        foreach (var stock in allStocks)
        {
            if (stock.Code == null || stock.Name == null)
            {
                continue;
            }

            // 解析实际买入时间，如果解析失败则用当前时间
            DateTime buyTime = DateTime.Now;
            if (!string.IsNullOrEmpty(stock.Date))
            {
                if (DateTime.TryParse(stock.Date, out var parsedDate))
                {
                    buyTime = parsedDate;
                }
            }

            var position = new Position
            {
                Id = "pos-" + Guid.NewGuid().ToString().Substring(0, 8),
                PortfolioId = portfolio.Id,
                StockCode = stock.Code,
                StockName = stock.Name,
                AssetType = string.IsNullOrEmpty(stock.AssetType) ? "Stock" : stock.AssetType,
                Shares = (decimal)stock.Amount,
                AvgPrice = (decimal)stock.Price,
                TotalCost = (decimal)(stock.Price * stock.Amount), // 初始成本 = 价格 × 数量
                Currency = stock.Currency ?? request.Currency, // 使用持仓币种，而非组合本位币
                CreatedAt = buyTime,
                UpdatedAt = DateTime.Now
            };

            _logger.LogInformation("创建持仓: {StockCode}, 数量={Shares}, 均价={AvgPrice}, 成本={TotalCost}", 
                stock.Code, stock.Amount, stock.Price, position.TotalCost);

            _db.Insertable(position).ExecuteCommand();

            // 创建交易记录（保存汇率信息）
            decimal totalAmount = (decimal)(stock.Price * stock.Amount);
            decimal? exchangeRate = null;
            decimal? totalAmountBase = null;
            
            // 如果持仓币种与组合币种不同，需要保存汇率
            if (!string.IsNullOrEmpty(stock.Currency) && !stock.Currency.Equals(request.Currency, StringComparison.OrdinalIgnoreCase))
            {
                exchangeRate = await _exchangeRateService.GetExchangeRateAsync(stock.Currency, request.Currency);
                totalAmountBase = totalAmount * exchangeRate.Value;
            }
            else
            {
                exchangeRate = 1.0m;
                totalAmountBase = totalAmount;
            }

            var transaction = new Transaction
            {
                Id = "trans-" + Guid.NewGuid().ToString().Substring(0, 8),
                PortfolioId = portfolio.Id,
                Type = "buy",
                StockCode = stock.Code,
                AssetType = string.IsNullOrEmpty(stock.AssetType) ? "Stock" : stock.AssetType,
                Title = "初始建仓",
                Amount = (decimal)stock.Amount,
                Price = (decimal)stock.Price,
                TotalAmount = totalAmount,
                Currency = stock.Currency ?? request.Currency,
                ExchangeRate = exchangeRate,
                TotalAmountBase = totalAmountBase,
                Status = "completed",
                Remark = "初始建仓",
                TransactionTime = buyTime,
                CreatedAt = DateTime.Now
            };

            _db.Insertable(transaction).ExecuteCommand();
        }

        return new CreatePortfolioResponse
        {
            Id = portfolio.Id,
            TotalValue = (double)portfolio.TotalValue,
            ReturnRate = 0,
            Currency = portfolio.Currency,
            CreatedAt = portfolio.CreatedAt.ToString("yyyy-MM-dd HH:mm:ss")
        };
    }

    public async Task<List<PortfolioListItem>> GetPortfolioListAsync(string userId)
    {
        var portfolios = _db.Queryable<Portfolio>()
            .Where(p => p.UserId == userId)
            .ToList();

        if (!portfolios.Any())
        {
            return new List<PortfolioListItem>();
        }

        // ===== 第一步：收集所有需要查询价格的股票代码 =====
        var portfolioIds = portfolios.Select(p => p.Id).ToList();
        var allPositions = _db.Queryable<Position>()
            .Where(pos => portfolioIds.Contains(pos.PortfolioId))
            .ToList();

        // 去重获取所有股票代码
        var stockCodes = allPositions
            .Where(p => p.StockCode != null)
            .Select(p => p.StockCode!)
            .Distinct()
            .ToList();

        // ===== 第二步：批量并行获取价格（利用缓存） =====
        var priceDict = new Dictionary<string, MarketPriceResponse>();
        var priceTasks = stockCodes.Select(async code =>
        {
            try
            {
                var pos = allPositions.First(p => p.StockCode == code);
                var assetType = pos.AssetType ?? "Stock";
                _logger.LogDebug("批量获取价格: {Code}, AssetType={AssetType}", code, assetType);
                var price = await _marketDataService.GetPriceAsync(code, assetType);
                return (code, price);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "批量获取价格失败: {Code}, 错误详情: {Message}", code, ex.Message);
                return (code, null);
            }
        }).ToList();

        var priceResults = await Task.WhenAll(priceTasks);
        foreach (var (code, price) in priceResults)
        {
            if (price != null)
            {
                priceDict[code] = price;
                _logger.LogInformation("批量获取价格成功: {Code} -> Price={Price}, PreviousClose={PreviousClose}", code, price.Price, price.PreviousClose);
            }
            else
            {
                _logger.LogWarning("批量获取价格返回 null: {Code}", code);
            }
        }

        // ===== 第三步：计算每个组合的数据 =====
        var result = new List<PortfolioListItem>();
        
        foreach (var p in portfolios)
        {
            var positions = allPositions.Where(pos => pos.PortfolioId == p.Id).ToList();
            int positionCount = positions.Count;
            
            decimal totalValue = 0;
            decimal totalCost = 0;
            decimal todayProfit = 0;
            string portfolioCurrency = p.Currency ?? "CNY";
            
            foreach (var pos in positions)
            {
                if (pos.StockCode == null || pos.Currency == null)
                {
                    continue;
                }

                // 从预获取的价格字典中获取
                decimal currentPrice = pos.AvgPrice;
                decimal previousClose = pos.AvgPrice;
                
                if (priceDict.TryGetValue(pos.StockCode, out var priceResponse))
                {
                    if (priceResponse.Price > 0)
                    {
                        currentPrice = priceResponse.Price;
                        previousClose = priceResponse.PreviousClose > 0 ? priceResponse.PreviousClose : currentPrice;
                        _logger.LogInformation("组合 {PortfolioId} 持仓 {StockCode} 使用实时价格: {Price}", p.Id, pos.StockCode, currentPrice);
                    }
                    else
                    {
                        _logger.LogWarning("组合 {PortfolioId} 持仓 {StockCode} 价格为 0，使用成本价", p.Id, pos.StockCode);
                    }
                }
                else
                {
                    _logger.LogWarning("组合 {PortfolioId} 持仓 {StockCode} 未在价格字典中，使用成本价", p.Id, pos.StockCode);
                }

                decimal positionValue = pos.Shares * currentPrice;
                decimal positionCost = pos.TotalCost; // 使用 TotalCost 字段
                decimal positionTodayProfit = previousClose > 0 ? pos.Shares * (currentPrice - previousClose) : 0;

                // 汇率转换（汇率服务有缓存，速度很快）
                var valueInTarget = await _exchangeRateService.ConvertAmountAsync(positionValue, pos.Currency, portfolioCurrency);
                var costInTarget = await _exchangeRateService.ConvertAmountAsync(positionCost, pos.Currency, portfolioCurrency);
                var todayProfitInTarget = await _exchangeRateService.ConvertAmountAsync(positionTodayProfit, pos.Currency, portfolioCurrency);

                totalValue += valueInTarget;
                totalCost += costInTarget;
                todayProfit += todayProfitInTarget;
            }

            double returnRate = totalCost > 0 ? (double)((totalValue - totalCost) / totalCost * 100) : 0;
            returnRate = Math.Round(returnRate, 2);
            
            result.Add(new PortfolioListItem
            {
                Id = p.Id,
                Name = p.Name,
                Tags = $"{p.Status} · {p.Currency}" + (positionCount > 0 ? $" · {positionCount}只" : ""),
                Status = p.Status,
                StatusType = p.Status == "运行中" ? "green" : p.Status == "已暂停" ? "yellow" : "gray",
                IconChar = p.Name?.Substring(0, 1).ToUpper() ?? "P",
                IconBgClass = "bg-blue-100",
                IconTextClass = "text-blue-700",
                Value = (double)totalValue,
                Currency = p.Currency,
                ReturnRate = returnRate,
                ReturnType = returnRate >= 0 ? "positive" : "negative",
                TodayProfit = (double)todayProfit,
                TodayProfitCurrency = p.Currency
            });
        }
        
        return result;
    }

    public async Task<TotalAssetsResponse> GetTotalAssetsAsync(string userId)
    {
        // 获取用户信息
        var user = _db.Queryable<User>()
            .Where(u => u.Id == userId)
            .First();

        if (user == null)
        {
            throw new Exception("User not found");
        }

        string targetCurrency = !string.IsNullOrEmpty(user.DefaultCurrency) ? user.DefaultCurrency : "CNY";
        _logger.LogInformation("用户 {UserId} 默认本位币: {Currency}", userId, targetCurrency);

        // 获取所有组合和持仓
        var portfolios = _db.Queryable<Portfolio>()
            .Where(p => p.UserId == userId)
            .ToList();

        if (!portfolios.Any())
        {
            return new TotalAssetsResponse
            {
                TotalValue = 0,
                Currency = targetCurrency,
                TodayProfit = 0,
                TodayProfitCurrency = targetCurrency,
                TotalReturnRate = 0
            };
        }

        var portfolioIds = portfolios.Select(p => p.Id).ToList();
        var allPositions = _db.Queryable<Position>()
            .Where(pos => portfolioIds.Contains(pos.PortfolioId))
            .ToList();

        if (!allPositions.Any())
        {
            return new TotalAssetsResponse
            {
                TotalValue = 0,
                Currency = targetCurrency,
                TodayProfit = 0,
                TodayProfitCurrency = targetCurrency,
                TotalReturnRate = 0
            };
        }

        // ===== 批量并行获取价格 =====
        var stockCodes = allPositions
            .Where(p => p.StockCode != null)
            .Select(p => p.StockCode!)
            .Distinct()
            .ToList();

        var priceDict = new Dictionary<string, MarketPriceResponse>();
        var priceTasks = stockCodes.Select(async code =>
        {
            try
            {
                var pos = allPositions.First(p => p.StockCode == code);
                var price = await _marketDataService.GetPriceAsync(code, pos.AssetType ?? "Stock");
                return (code, price);
            }
            catch (Exception ex)
            {
                _logger.LogWarning(ex, "批量获取价格失败: {Code}", code);
                return (code, null);
            }
        }).ToList();

        var priceResults = await Task.WhenAll(priceTasks);
        foreach (var (code, price) in priceResults)
        {
            if (price != null)
            {
                priceDict[code] = price;
            }
        }

        // ===== 计算总资产 =====
        decimal totalValueInTargetCurrency = 0;
        decimal totalCostInTargetCurrency = 0;
        decimal totalTodayProfitInTargetCurrency = 0;

        foreach (var pos in allPositions)
        {
            if (pos.StockCode == null || pos.Currency == null)
            {
                continue;
            }

            decimal currentPrice = pos.AvgPrice;
            decimal previousClose = pos.AvgPrice;
            
            if (priceDict.TryGetValue(pos.StockCode, out var priceResponse))
            {
                if (priceResponse.Price > 0)
                {
                    currentPrice = priceResponse.Price;
                    previousClose = priceResponse.PreviousClose > 0 ? priceResponse.PreviousClose : currentPrice;
                }
            }

            decimal positionValue = pos.Shares * currentPrice;
            decimal costValue = pos.TotalCost; // 使用 TotalCost 字段
            decimal todayProfit = previousClose > 0 ? pos.Shares * (currentPrice - previousClose) : 0;

            // 汇率转换
            var currentInTarget = await _exchangeRateService.ConvertAmountAsync(positionValue, pos.Currency, targetCurrency);
            var costInTarget = await _exchangeRateService.ConvertAmountAsync(costValue, pos.Currency, targetCurrency);
            var todayProfitInTarget = await _exchangeRateService.ConvertAmountAsync(todayProfit, pos.Currency, targetCurrency);

            totalValueInTargetCurrency += currentInTarget;
            totalCostInTargetCurrency += costInTarget;
            totalTodayProfitInTargetCurrency += todayProfitInTarget;
        }

        double totalReturnRate = totalCostInTargetCurrency > 0 
            ? (double)((totalValueInTargetCurrency - totalCostInTargetCurrency) / totalCostInTargetCurrency * 100) 
            : 0;

        return new TotalAssetsResponse
        {
            TotalValue = (double)totalValueInTargetCurrency,
            Currency = targetCurrency,
            TodayProfit = (double)totalTodayProfitInTargetCurrency,
            TodayProfitCurrency = targetCurrency,
            TotalReturnRate = Math.Round(totalReturnRate, 2)
        };
    }

    public async Task<PortfolioDetailResponse> GetPortfolioByIdAsync(string id, string userId)
    {
        var portfolio = _db.Queryable<Portfolio>()
            .Where(p => p.Id == id && p.UserId == userId)
            .First();

        if (portfolio == null)
        {
            throw new Exception("Portfolio not found or access denied");
        }

        var Positions = _db.Queryable<Position>()
            .Where(pos => pos.PortfolioId == id)
            .ToList();

        // 获取每个持仓的实时价格并转换为组合本位币
        string targetCurrency = portfolio.Currency ?? "CNY";
        decimal totalPortfolioValue = 0;
        decimal totalCost = 0;
        decimal totalTodayProfit = 0;
        var positionItems = new List<PositionItem>();

        foreach (var pos in Positions)
        {
            if (pos.StockCode == null || pos.Currency == null)
            {
                continue;
            }

            // 获取实时价格（自动路由数据源），失败则降级使用成本价
            decimal CurrentPrice = pos.AvgPrice;
            decimal previousClose = pos.AvgPrice;
            try
            {
                var priceResponse = await _marketDataService.GetPriceAsync(pos.StockCode, pos.AssetType ?? "Stock");
                if (priceResponse.Price > 0)
                {
                    CurrentPrice = priceResponse.Price;
                    previousClose = priceResponse.PreviousClose > 0 ? priceResponse.PreviousClose : CurrentPrice;
                }
            }
            catch (Exception ex)
            {
                _logger.LogWarning(ex, "获取标的 {StockCode} 实时价格失败，使用成本价作为当前价", pos.StockCode);
            }

            decimal positionValue = pos.Shares * CurrentPrice;
            decimal cost = pos.TotalCost; // 使用 TotalCost 字段，精确追踪卖出后的剩余成本
            decimal TodayProfit = previousClose > 0 ? pos.Shares * (CurrentPrice - previousClose) : 0;

            _logger.LogDebug("持仓 {StockCode}: 数量={Shares}, 当前价={CurrentPrice}, 市值={Value}, 成本={Cost}", 
                pos.StockCode, pos.Shares, CurrentPrice, positionValue, cost);

            // 转换为组合本位币（先转换，再计算盈亏率，避免汇率变化影响）
            decimal positionValueInTarget = await _exchangeRateService.ConvertAmountAsync(positionValue, pos.Currency, targetCurrency);
            decimal costInTarget = await _exchangeRateService.ConvertAmountAsync(cost, pos.Currency, targetCurrency);
            decimal todayProfitInTarget = await _exchangeRateService.ConvertAmountAsync(TodayProfit, pos.Currency, targetCurrency);

            // 用目标币种计算盈亏率（正确处理汇率变化）
            decimal ProfitInTarget = positionValueInTarget - costInTarget;
            double ProfitRate = costInTarget > 0 ? (double)(ProfitInTarget / costInTarget * 100) : 0;

            totalPortfolioValue += positionValueInTarget;
            totalCost += costInTarget;
            totalTodayProfit += todayProfitInTarget;

            positionItems.Add(new PositionItem
            {
                Id = pos.Id,
                StockCode = pos.StockCode,
                StockName = pos.StockName,
                Symbol = pos.StockCode,
                Amount = (int)pos.Shares, // 注意：此处精度丢失，仅用于显示
                Shares = (double)pos.Shares, // 新增：保留完整精度
                AveragePrice = (double)pos.AvgPrice,
                CurrentPrice = (double)CurrentPrice,
                TotalValue = (double)positionValueInTarget,
                Profit = (double)(positionValueInTarget - costInTarget),
                ProfitRate = ProfitRate,
                ChangeAmount = (double)todayProfitInTarget,
                Ratio = 0, // 后面统一计算比例
                DeviationRatio = 0, // 后续实现
                Currency = targetCurrency
            });
        }

        // 计算每个持仓的比例
        foreach (var item in positionItems)
        {
            item.Ratio = totalPortfolioValue > 0 ? (item.TotalValue / (double)totalPortfolioValue) * 100 : 0;
        }

        decimal TotalReturn = totalPortfolioValue - totalCost;
        double totalReturnRate = totalCost > 0 ? (double)(TotalReturn / totalCost * 100) : 0;

        return new PortfolioDetailResponse
        {
            Id = portfolio.Id,
            Name = portfolio.Name,
            Currency = targetCurrency,
            Status = portfolio.Status,
            Strategy = new StrategyInfo
            {
                Id = portfolio.StrategyId,
                Name = "策略名称",
                Description = "策略描述"
            },
            PortfolioValue = (double)totalPortfolioValue,
            TotalReturn = (double)TotalReturn,
            TodayProfit = (double)totalTodayProfit,
            HistoricalChange = totalReturnRate,
            DailyVolatility = 0, // 后续实现
            TodayProfitCurrency = targetCurrency,
            LogicModel = "HFEA 风险平价逻辑",
            LogicModelStatus = "监控中",
            LogicModelDescription = "目标权重 季度调仓",
            TotalItems = Positions.Count,
            TotalRatio = 100.0,
            Positions = positionItems
        };
    }

    public async Task<GetTransactionsResponse> GetTransactionsAsync(string portfolioId, string userId, int limit, int offset)
    {
        // 验证投资组合是否属于该用户
        var portfolio = _db.Queryable<Portfolio>()
            .Where(p => p.Id == portfolioId && p.UserId == userId)
            .First();

        if (portfolio == null)
        {
            throw new Exception("Portfolio not found or access denied");
        }

        var transactions = _db.Queryable<Transaction>()
            .Where(t => t.PortfolioId == portfolioId)
            .OrderByDescending(t => t.TransactionTime)
            .Skip(offset)
            .Take(limit)
            .ToList();

        var total = _db.Queryable<Transaction>()
            .Where(t => t.PortfolioId == portfolioId)
            .Count();

        return new GetTransactionsResponse
        {
            Items = transactions.Select(t => new TransactionItem
            {
                Id = t.Id,
                PortfolioId = t.PortfolioId,
                Date = t.TransactionTime.ToString("yyyy-MM-dd"),
                Time = t.TransactionTime.ToString("HH:mm:ss"),
                Type = t.Type,
                Title = t.Title,
                StockCode = t.StockCode,
                Amount = (double)t.TotalAmount,
                Currency = t.Currency,
                Status = t.Status,
                Remark = t.Remark
            }).ToList(),
            Total = total,
            Page = offset / limit + 1,
            PageSize = limit
        };
    }

    public async Task<CreateTransactionResponse> CreateTransaction(CreateTransactionRequest request, string userId)
    {
        // 验证投资组合是否属于该用户
        var portfolio = _db.Queryable<Portfolio>()
            .Where(p => p.Id == request.PortfolioId && p.UserId == userId)
            .First();

        if (portfolio == null)
        {
            throw new Exception("Portfolio not found or access denied");
        }

        // 校验交易币种必须和组合本位币一致（双重校验）
        if (!string.IsNullOrEmpty(request.Currency) && !request.Currency.Equals(portfolio.Currency, StringComparison.OrdinalIgnoreCase))
        {
            throw new Exception($"该组合本位币为 {portfolio.Currency}，只能添加相同币种的标的");
        }

        // 卖出操作校验
        if (request.Type?.ToLower() == "sell")
        {
            // 校验是否有该持仓
            var existingPosition = _db.Queryable<Position>()
                .Where(pos => pos.PortfolioId == request.PortfolioId && pos.StockCode == request.StockCode)
                .First();

            if (existingPosition == null)
            {
                throw new Exception($"该组合中不存在标的 {request.StockCode}，无法卖出");
            }

            // 校验卖出数量不超过持仓数量
            if (request.Amount > (double)existingPosition.Shares)
            {
                throw new Exception($"卖出数量不能超过持仓数量，当前持仓 {existingPosition.Shares} 份");
            }
        }

        // 解析实际交易时间，如果解析失败则用当前时间
        DateTime transactionTime = DateTime.Now;
        if (!string.IsNullOrEmpty(request.TransactionDate))
        {
            if (DateTime.TryParse(request.TransactionDate, out var parsedDate))
            {
                transactionTime = parsedDate.Date;
            }
        }
        // 组合时间部分
        if (!string.IsNullOrEmpty(request.TransactionTime))
        {
            if (TimeSpan.TryParse(request.TransactionTime, out var parsedTime))
            {
                transactionTime = transactionTime.Date + parsedTime;
            }
        }

        // 获取交易时汇率并保存（用于历史净值计算）
        string baseCurrency = portfolio.Currency ?? "CNY";
        decimal? exchangeRate = null;
        decimal? totalAmountBase = null;
        
        if (!string.IsNullOrEmpty(request.Currency) && !request.Currency.Equals(baseCurrency, StringComparison.OrdinalIgnoreCase))
        {
            exchangeRate = await _exchangeRateService.GetExchangeRateAsync(request.Currency, baseCurrency);
            totalAmountBase = (decimal)(request.Price * request.Amount) * exchangeRate.Value;
            _logger.LogInformation("交易汇率: {FromCurrency} -> {ToCurrency} = {Rate}, 原始金额={Amount}, 本位币金额={BaseAmount}",
                request.Currency, baseCurrency, exchangeRate, request.Price * request.Amount, totalAmountBase);
        }
        else
        {
            exchangeRate = 1.0m;
            totalAmountBase = (decimal)(request.Price * request.Amount);
        }

        var transaction = new Transaction
        {
            Id = "trans-" + Guid.NewGuid().ToString().Substring(0, 8),
            PortfolioId = request.PortfolioId,
            Type = request.Type,
            StockCode = request.StockCode,
            AssetType = string.IsNullOrEmpty(request.AssetType) ? "Stock" : request.AssetType,
            Title = request.Remark ?? "交易",
            Amount = (decimal)request.Amount,
            Price = (decimal)request.Price,
            TotalAmount = (decimal)(request.Price * request.Amount),
            Currency = request.Currency,
            ExchangeRate = exchangeRate,
            TotalAmountBase = totalAmountBase,
            Status = "completed",
            Remark = request.Remark ?? string.Empty,
            TransactionTime = transactionTime,
            CreatedAt = DateTime.Now
        };

        // 使用事务包裹所有数据库操作
        try
        {
            _db.BeginTran();

            // 1. 插入交易记录
            _db.Insertable(transaction).ExecuteCommand();

            // 2. 更新持仓
            var position = _db.Queryable<Position>()
                .Where(pos => pos.PortfolioId == request.PortfolioId && pos.StockCode == request.StockCode)
                .First();

            if (position != null)
            {
                if (request.Type == "buy")
                {
                    // 计算新的平均价格和总成本
                    var buyAmount = (decimal)request.Amount * (decimal)request.Price;
                    var newTotalShares = position.Shares + (decimal)request.Amount;
                    var newTotalCost = position.TotalCost + buyAmount;
                    position.AvgPrice = newTotalCost / newTotalShares;
                    position.TotalCost = newTotalCost;
                    position.Shares = newTotalShares;
                    position.UpdatedAt = DateTime.Now;
                    
                    _logger.LogInformation("买入更新持仓: {StockCode}, +{Amount}股@{Price}, 新成本={TotalCost}, 新均价={AvgPrice}", 
                        position.StockCode, request.Amount, request.Price, position.TotalCost, position.AvgPrice);
                    
                    _db.Updateable(position).ExecuteCommand();
                }
                else if (request.Type == "sell")
                {
                    // 按比例减少成本
                    var sellRatio = (decimal)request.Amount / position.Shares;
                    var costToReduce = position.TotalCost * sellRatio;
                    
                    position.Shares -= (decimal)request.Amount;
                    position.TotalCost -= costToReduce;
                    position.UpdatedAt = DateTime.Now;
                    
                    _logger.LogInformation("卖出更新持仓: {StockCode}, -{Amount}股@{Price}, 减少成本={CostToReduce}, 剩余成本={TotalCost}", 
                        position.StockCode, request.Amount, request.Price, costToReduce, position.TotalCost);
                    
                    if (position.Shares <= 0)
                    {
                        _db.Deleteable(position).ExecuteCommand();
                    }
                    else
                    {
                        _db.Updateable(position).ExecuteCommand();
                    }
                }
            }
            else if (request.Type == "buy")
            {
                // 创建新持仓
                position = new Position
                {
                    Id = "pos-" + Guid.NewGuid().ToString().Substring(0, 8),
                    PortfolioId = request.PortfolioId,
                    StockCode = request.StockCode,
                    StockName = request.Remark ?? request.StockCode,
                    AssetType = string.IsNullOrEmpty(request.AssetType) ? "Stock" : request.AssetType,
                    Shares = (decimal)request.Amount,
                    AvgPrice = (decimal)request.Price,
                    TotalCost = (decimal)(request.Price * request.Amount),
                    Currency = request.Currency,
                    CreatedAt = DateTime.Now,
                    UpdatedAt = DateTime.Now
                };
                
                _logger.LogInformation("创建新持仓: {StockCode}, 数量={Shares}, 均价={AvgPrice}, 成本={TotalCost}", 
                    position.StockCode, position.Shares, position.AvgPrice, position.TotalCost);
                
                _db.Insertable(position).ExecuteCommand();
            }

            // 3. 更新投资组合总价值
            var Positions = _db.Queryable<Position>()
                .Where(pos => pos.PortfolioId == request.PortfolioId)
                .ToList();

            decimal totalPortfolioValue = 0;
            foreach (var pos in Positions)
            {
                if (pos.StockCode == null)
                {
                    continue;
                }

                // 获取实时价格（异步调用），失败则降级使用成本价
                decimal CurrentPrice = pos.AvgPrice;
                try
                {
                    var priceResponse = await _marketDataService.GetPriceAsync(pos.StockCode, pos.AssetType ?? "Stock");
                    if (priceResponse.Price > 0)
                    {
                        CurrentPrice = priceResponse.Price;
                    }
                }
                catch (Exception ex)
                {
                    _logger.LogWarning(ex, "获取标的 {StockCode} 实时价格失败，使用成本价计算组合总价值", pos.StockCode);
                }

                totalPortfolioValue += pos.Shares * CurrentPrice;
            }

            portfolio.TotalValue = totalPortfolioValue;
            portfolio.UpdatedAt = DateTime.Now;
            _db.Updateable(portfolio).ExecuteCommand();

            // 提交事务
            _db.CommitTran();
        }
        catch (Exception ex)
        {
            _db.RollbackTran();
            _logger.LogError(ex, "创建交易失败，已回滚: {PortfolioId}, {StockCode}", request.PortfolioId, request.StockCode);
            throw;
        }

        // 删除该交易日期之后的净值历史记录，下次请求收益曲线时会自动重新计算
        try
        {
            var deletedCount = await _navService.DeleteNavHistoryAfterDateAsync(request.PortfolioId, transactionTime.Date);
            if (deletedCount > 0)
            {
                _logger.LogInformation("交易创建后删除净值历史: PortfolioId={PortfolioId}, Date={Date}, Count={Count}",
                    request.PortfolioId, transactionTime.Date, deletedCount);
            }
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "删除净值历史失败，将在下次请求时重新计算");
        }

        return new CreateTransactionResponse
        {
            Id = transaction.Id,
            TotalAmount = (double)transaction.TotalAmount,
            Status = transaction.Status,
            CreatedAt = transaction.CreatedAt.ToString("yyyy-MM-dd HH:mm:ss")
        };
    }

    // ===== 异步方法实现 =====

    public async Task<TransactionItem> CreateTransactionAsync(string portfolioId, CreateTransactionRequest request, string userId)
    {
        request.PortfolioId = portfolioId;
        var response = await CreateTransaction(request, userId);
        
        // 使用实际交易时间
        var transactionDate = request.TransactionDate ?? DateTime.Now.ToString("yyyy-MM-dd");
        var transactionTime = request.TransactionTime ?? DateTime.Now.ToString("HH:mm");
        
        return new TransactionItem
        {
            Id = response.Id,
            PortfolioId = portfolioId,
            Date = transactionDate,
            Time = transactionTime,
            Type = request.Type,
            StockCode = request.StockCode,
            Amount = response.TotalAmount,
            Currency = request.Currency,
            Status = response.Status,
            Remark = request.Remark
        };
    }

    public async Task<bool> UpdatePortfolioAsync(string portfolioId, UpdatePortfolioRequest request, string userId)
    {
        var portfolio = _db.Queryable<Portfolio>()
            .Where(p => p.Id == portfolioId && p.UserId == userId)
            .First();

        if (portfolio == null)
        {
            return false;
        }

        // 更新字段
        if (!string.IsNullOrEmpty(request.Name))
        {
            portfolio.Name = request.Name;
        }
        
        // 策略可以为空（解绑策略）
        portfolio.StrategyId = request.StrategyId;
        
        if (!string.IsNullOrEmpty(request.Status))
        {
            portfolio.Status = request.Status;
        }
        
        portfolio.UpdatedAt = DateTime.Now;
        
        _db.Updateable(portfolio).ExecuteCommand();
        _logger.LogInformation("更新投资组合: {PortfolioId}, 名称: {Name}, 策略: {StrategyId}", 
            portfolioId, portfolio.Name, portfolio.StrategyId ?? "无");
        
        return true;
    }

    public async Task<bool> DeletePortfolioAsync(string portfolioId, string userId)
    {
        var portfolio = _db.Queryable<Portfolio>()
            .Where(p => p.Id == portfolioId && p.UserId == userId)
            .First();

        if (portfolio == null)
        {
            return false;
        }

        // 删除相关持仓
        var Positions = _db.Queryable<Position>()
            .Where(pos => pos.PortfolioId == portfolioId)
            .ToList();
        if (Positions.Any())
        {
            _db.Deleteable(Positions).ExecuteCommand();
        }

        // 删除相关交易
        var transactions = _db.Queryable<Transaction>()
            .Where(t => t.PortfolioId == portfolioId)
            .ToList();
        if (transactions.Any())
        {
            _db.Deleteable(transactions).ExecuteCommand();
        }

        // 删除净值历史
        var navHistory = _db.Queryable<PortfolioNavHistory>()
            .Where(n => n.PortfolioId == portfolioId)
            .ToList();
        if (navHistory.Any())
        {
            _db.Deleteable(navHistory).ExecuteCommand();
        }

        // 删除组合
        _db.Deleteable(portfolio).ExecuteCommand();

        return true;
    }
}