добавлен контроллер для получения диапозона

изменен аргумент метода
перестроена логика работы метода и возвращаемое значение

AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs

@@ -1,5 +1,6 @@
 using AsbCloudApp.Data.Subsystems;
 using AsbCloudApp.Requests;
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
@@ -41,10 +42,10 @@ namespace AsbCloudApp.Services.Subsystems
         /// <summary>
         /// Временной диапазон за который есть статистика работы подсистем
         /// </summary>
-        /// <param name="idSubsystem"></param>
+        /// <param name="request"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<IEnumerable<SubsystemOperationTimeDto>?> GetDateRangeOperationTimeAsync(int idSubsystem, CancellationToken token);
+        Task<IEnumerable<(DateTimeOffset, DateTimeOffset)>?> GetDateRangeOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token);       
     }
 #nullable disable
 }

AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs

@@ -185,22 +185,28 @@ namespace AsbCloudInfrastructure.Services.Subsystems
 
         }
 
-        private async Task<(DateTimeOffset, DateTimeOffset)?> GetDateRangeOperationTime(int idSubsystem, CancellationToken token)
+        /// <inheritdoc/>
+        public async Task<IEnumerable<(DateTimeOffset, DateTimeOffset)>?> GetDateRangeOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token)
         {
-            var dateRange = await db.SubsystemOperationTimes
+            if (request.IdsSubsystems is null)
-                .Where(o => o.Id == idSubsystem)
+                return null;
+             List<(DateTimeOffset dateFirst, DateTimeOffset dateLast)> result = new();
+             var dateRanges = await db.SubsystemOperationTimes
+                 .Where(o => request.IdsSubsystems.Contains(o.IdSubsystem))
                  .GroupBy(o => o.IdSubsystem)
                  .Select(g => new
                  {
                      DateFirst = g.Min(o => o.DateStart),
                      DateLast = g.Max(o => o.DateEnd)
                  })
-                .FirstOrDefaultAsync(token);
+                 .ToListAsync(token);
-            if (dateRange == null)
+            if (dateRanges.Any() != true)            
-            {
                 return null;            
+            foreach (var dateRange in dateRanges)
+            {
+                var resultItem = (dateRange.DateFirst, dateRange.DateLast);
+                result.Add(resultItem);
             }
-            (DateTimeOffset dateFirst, DateTimeOffset dateLast) result = (dateRange.DateFirst, dateRange.DateLast);
             return result;
         }
 
@@ -268,6 +274,8 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             dto.DateEnd = operationTime.DateEnd.ToRemoteDateTime(well.Timezone.Hours);
             return dto;
         }
+
+        
     }
 #nullable disable
 }

AsbCloudWebApi/Controllers/Subsystems/SubsystemOperationTimeController.cs

@@ -59,6 +59,19 @@ namespace AsbCloudWebApi.Controllers.Subsystems
             return Ok(result);
         }
 
+        /// <summary>
+        /// получить доступный диапазон дат наработки подсистемы. 
+        /// </summary>
+        [HttpGet("rangeDate")]
+        [ProducesResponseType(typeof(IEnumerable<SubsystemDto>), (int)System.Net.HttpStatusCode.OK)]
+        public async Task<IActionResult> GetDateRangeOperationTimeAsync([FromQuery] SubsystemOperationTimeRequest request, CancellationToken token = default)
+        {
+            if (!await UserHasAccesToWellAsync(request.IdWell, token))
+                return Forbid();
+            var result = await subsystemOperationTimeService.GetDateRangeOperationTimeAsync(request, token);
+            return Ok(result);
+        }
+
         /// <summary>
         /// получить список наработок подсистем 
         /// </summary>