From 2921481d364ed6bb79153d9f71a1b3235666721f Mon Sep 17 00:00:00 2001
From: Apollo3zehn <git@m1.apollo3zehn.net>
Date: Mon, 11 Sep 2023 10:59:53 +0200
Subject: [PATCH] Minor bug fix

---
 CHANGELOG.md                                  |  4 +++
 .../StructuredFileDataSource.cs               | 26 +++++++++++++++++--
 version.json                                  |  2 +-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f79f9c2..5fc27a9 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## v2.0.0-beta.9 - 2023-09-11
+
+- Minor bug fix.
+
 ## v2.0.0-beta.8 - 2023-09-11
 
 - Do not catch OutOfMemory Exceptions.
diff --git a/src/Nexus.Sources.StructuredFile/StructuredFileDataSource.cs b/src/Nexus.Sources.StructuredFile/StructuredFileDataSource.cs
index 3f752f2..ea55642 100644
--- a/src/Nexus.Sources.StructuredFile/StructuredFileDataSource.cs
+++ b/src/Nexus.Sources.StructuredFile/StructuredFileDataSource.cs
@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.Runtime.CompilerServices;
 using System.Text.RegularExpressions;
 using Microsoft.Extensions.Logging;
 using Nexus.DataModel;
@@ -370,8 +371,29 @@ protected virtual async Task ReadAsync(
                             var filePaths = await FindFilePathsAsync(currentBegin, fileSource);
 
                             // determine file begin
-                            if (!TryGetFileBeginByPath(filePaths.First(), fileSource, out var fileBegin, folderBegin: default))
-                                throw new Exception($"Unable to determine date/time of file {filePaths.First()}.");
+                            DateTime fileBegin;
+
+                            if (filePaths.Any())
+                            {
+                                if (!TryGetFileBeginByPath(filePaths.First(), fileSource, out fileBegin, folderBegin: default))
+                                    throw new Exception($"Unable to determine date/time of file {filePaths.First()}.");
+                            }
+
+                            else
+                            {
+                                // TODO: Test this code path
+                                // determine begin of missing file
+                                var localBegin = begin.Kind switch
+                                {
+                                    DateTimeKind.Local => begin,
+                                    DateTimeKind.Utc => DateTime.SpecifyKind(begin.Add(fileSource.UtcOffset), DateTimeKind.Local),
+                                    _ => throw new ArgumentException("The begin parameter must have its kind property specified.")
+                                };
+
+                                var roundedLocalBegin = localBegin.RoundDown(fileSource.FilePeriod);
+
+                                fileBegin = AdjustToUtc(roundedLocalBegin, fileSource.UtcOffset);
+                            }
 
                             /* CB = Current Begin, FP = File Period
                             * 
diff --git a/version.json b/version.json
index 4ab5f6f..2ae005b 100755
--- a/version.json
+++ b/version.json
@@ -1,4 +1,4 @@
 {
     "version": "2.0.0",
-    "suffix": "beta.8"
+    "suffix": "beta.9"
 }
\ No newline at end of file