1

Service/Transaction/TransactionStatisticsService.cs

@@ -10,6 +10,11 @@ public interface ITransactionStatisticsService
 
     Task<List<CategoryStatistics>> GetCategoryStatisticsAsync(int year, int month, TransactionType type);
 
+    /// <summary>
+    /// 按日期范围获取分类统计数据
+    /// </summary>
+    Task<List<CategoryStatistics>> GetCategoryStatisticsByDateRangeAsync(DateTime startDate, DateTime endDate, TransactionType type);
+
     Task<List<TrendStatistics>> GetTrendStatisticsAsync(int startYear, int startMonth, int monthCount);
 
     Task<(List<ReasonGroupDto> list, int total)> GetReasonGroupsAsync(int pageIndex = 1, int pageSize = 20);
@@ -145,6 +150,40 @@ public class TransactionStatisticsService(
         return categoryGroups;
     }
 
+    /// <summary>
+    /// 按日期范围获取分类统计数据
+    /// </summary>
+    public async Task<List<CategoryStatistics>> GetCategoryStatisticsByDateRangeAsync(DateTime startDate, DateTime endDate, TransactionType type)
+    {
+        var records = await transactionRepository.QueryAsync(
+            startDate: startDate,
+            endDate: endDate,
+            type: type,
+            pageSize: int.MaxValue);
+
+        var categoryGroups = records
+            .GroupBy(t => t.Classify)
+            .Select(g => new CategoryStatistics
+            {
+                Classify = g.Key,
+                Amount = g.Sum(t => Math.Abs(t.Amount)),
+                Count = g.Count()
+            })
+            .OrderByDescending(c => c.Amount)
+            .ToList();
+
+        var total = categoryGroups.Sum(c => c.Amount);
+        if (total > 0)
+        {
+            foreach (var category in categoryGroups)
+            {
+                category.Percent = Math.Round((category.Amount / total) * 100, 1);
+            }
+        }
+
+        return categoryGroups;
+    }
+
     public async Task<List<TrendStatistics>> GetTrendStatisticsAsync(int startYear, int startMonth, int monthCount)
     {
         var trends = new List<TrendStatistics>();