pagination for backtest and optimization

src/Managing.Api/Controllers/BacktestController.cs

@@ -134,6 +134,54 @@ public class BacktestController : BaseController
         return Ok(backtests);
     }
 
+    /// <summary>
+    /// Retrieves paginated backtests for a specific genetic request ID.
+    /// This endpoint is used to view the results of a genetic algorithm optimization with pagination support.
+    /// </summary>
+    /// <param name="requestId">The request ID to filter backtests by.</param>
+    /// <param name="page">Page number (defaults to 1)</param>
+    /// <param name="pageSize">Number of items per page (defaults to 50, max 100)</param>
+    /// <returns>A paginated list of backtests associated with the specified request ID.</returns>
+    [HttpGet]
+    [Route("ByRequestId/{requestId}/Paginated")]
+    public async Task<ActionResult<PaginatedBacktestsResponse>> GetBacktestsByRequestIdPaginated(
+        string requestId, 
+        int page = 1, 
+        int pageSize = 50)
+    {
+        if (string.IsNullOrEmpty(requestId))
+        {
+            return BadRequest("Request ID is required");
+        }
+
+        if (page < 1)
+        {
+            return BadRequest("Page must be greater than 0");
+        }
+
+        if (pageSize < 1 || pageSize > 100)
+        {
+            return BadRequest("Page size must be between 1 and 100");
+        }
+
+        var (backtests, totalCount) = _backtester.GetBacktestsByRequestIdPaginated(requestId, page, pageSize);
+        
+        var totalPages = (int)Math.Ceiling(totalCount / (double)pageSize);
+        
+        var response = new PaginatedBacktestsResponse
+        {
+            Backtests = backtests,
+            TotalCount = totalCount,
+            CurrentPage = page,
+            PageSize = pageSize,
+            TotalPages = totalPages,
+            HasNextPage = page < totalPages,
+            HasPreviousPage = page > 1
+        };
+
+        return Ok(response);
+    }
+
     /// <summary>
     /// Runs a backtest with the specified configuration.
     /// The returned backtest includes a complete TradingBotConfig that preserves all