feat: Yahoo历史数据根据timeframe和limit动态计算开始日期

AssetManager.Infrastructure/Services/YahooMarketService.cs

@@ -29,15 +29,10 @@ public interface IYahooMarketService
 public class YahooMarketService : IYahooMarketService
 {
     private readonly ILogger<YahooMarketService> _logger;
-    private readonly YahooQuotes _yahooQuotes;
 
     public YahooMarketService(ILogger<YahooMarketService> logger)
     {
         _logger = logger;
-        // 默认获取最近60天的历史数据
-        _yahooQuotes = new YahooQuotesBuilder()
-            .WithHistoryStartDate(Instant.FromDateTimeUtc(DateTime.UtcNow.AddDays(-60)))
-            .Build();
     }
 
     /// <summary>
@@ -55,12 +50,34 @@ public class YahooMarketService : IYahooMarketService
         return symbol.ToUpper().Replace(".", "-");
     }
 
+    /// <summary>
+    /// 根据 timeframe 和 limit 计算需要的开始日期
+    /// </summary>
+    private DateTime CalculateStartDate(string timeframe, int limit)
+    {
+        var now = DateTime.UtcNow;
+        
+        // 根据周期类型计算需要的天数，预留缓冲
+        return timeframe.ToLower() switch
+        {
+            "1d" or "daily" or "day" => now.AddDays(-limit * 1.5),       // 日线：limit * 1.5 天
+            "1w" or "weekly" or "week" => now.AddDays(-limit * 8),       // 周线：limit * 8 天
+            "1m" or "monthly" or "month" => now.AddDays(-limit * 35),    // 月线：limit * 35 天
+            _ => now.AddDays(-Math.Max(limit * 2, 365))                  // 默认：至少365天
+        };
+    }
+
     public async Task<MarketPriceResponse> GetStockPriceAsync(string symbol)
     {
         var yahooSymbol = ConvertToYahooSymbol(symbol);
         _logger.LogInformation("Yahoo获取股票价格: {Symbol} -> {YahooSymbol}", symbol, yahooSymbol);
         
-        Snapshot? snapshot = await _yahooQuotes.GetSnapshotAsync(yahooSymbol);
+        // 实时价格不需要历史数据，使用最小范围
+        var yahooQuotes = new YahooQuotesBuilder()
+            .WithHistoryStartDate(Instant.FromDateTimeUtc(DateTime.UtcNow.AddDays(-7)))
+            .Build();
+        
+        Snapshot? snapshot = await yahooQuotes.GetSnapshotAsync(yahooSymbol);
         if (snapshot is null)
             throw new InvalidOperationException($"Yahoo未知标的: {symbol}");
         
@@ -90,7 +107,15 @@ public class YahooMarketService : IYahooMarketService
         var yahooSymbol = ConvertToYahooSymbol(symbol);
         _logger.LogInformation("Yahoo获取历史数据: {Symbol} -> {YahooSymbol}, {Timeframe}, {Limit}", symbol, yahooSymbol, timeframe, limit);
         
-        Result<History> result = await _yahooQuotes.GetHistoryAsync(yahooSymbol);
+        // 根据请求参数动态计算开始日期
+        var startDate = CalculateStartDate(timeframe, limit);
+        _logger.LogDebug("历史数据开始日期: {StartDate}", startDate.ToString("yyyy-MM-dd"));
+        
+        var yahooQuotes = new YahooQuotesBuilder()
+            .WithHistoryStartDate(Instant.FromDateTimeUtc(startDate))
+            .Build();
+        
+        Result<History> result = await yahooQuotes.GetHistoryAsync(yahooSymbol);
         if (result.Value == null)
             throw new InvalidOperationException($"Yahoo获取历史数据失败，标的: {symbol}");
         
@@ -120,7 +145,7 @@ public class YahooMarketService : IYahooMarketService
             .TakeLast(limit)
             .ToList();
         
-        _logger.LogInformation("Yahoo获取 {Symbol} 历史数据 {Count} 条", symbol, sortedData.Count);
+        _logger.LogInformation("Yahoo获取 {Symbol} 历史数据 {Count} 条（请求 {Limit} 条）", symbol, sortedData.Count, limit);
         
         return sortedData;
     }