generate fake epg data for graphics elements when troubleshooting (#2415)

CHANGELOG.md

@@ -51,6 +51,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix inefficient database migration that would cause database initialization to get stuck
 - Classic schedules: fix scheduling behavior when a flood item is before a flexible fixed start item
   - Sometimes the flood item wouldn't schedule anything
+- Fix troubleshooting certain text graphics elements by generating fake EPG data
 
 ### Changed
 - **BREAKING CHANGE**: change how `Scripted Schedule` system works

ErsatzTV.Infrastructure/Data/Repositories/TemplateDataRepository.cs

@@ -33,6 +33,36 @@ public class TemplateDataRepository(ILocalFileSystem localFileSystem, IDbContext
     {
         try
         {
+            if (channelNumber.Equals(".troubleshooting", StringComparison.OrdinalIgnoreCase))
+            {
+                var now = DateTimeOffset.Now;
+                var topOfHour = new DateTimeOffset(now.Year, now.Month, now.Day, now.Hour, 0, 0, now.Offset);
+
+                List<EpgProgrammeTemplateData> result = [];
+
+                for (var i = 0; i < count; i++)
+                {
+                    var data = new EpgProgrammeTemplateData
+                    {
+                        Title = $"Fake Epg Title {i}",
+                        SubTitle = $"Fake Epg SubTitle {i}",
+                        Description = string.Empty,
+                        Rating = string.Empty,
+                        Categories = [],
+                        Date = $"Fake Epg Date {i}",
+                        Start = topOfHour + i * TimeSpan.FromHours(1),
+                        Stop = topOfHour + (i + 1) * TimeSpan.FromHours(1),
+                    };
+
+                    result.Add(data);
+                }
+
+                return new Dictionary<string, object>
+                {
+                    [EpgTemplateDataKey.Epg] = result
+                };
+            }
+
             string targetFile = Path.Combine(FileSystemLayout.ChannelGuideCacheFolder, $"{channelNumber}.xml");
             if (localFileSystem.FileExists(targetFile))
             {

ErsatzTV.Infrastructure/Streaming/Graphics/GraphicsElementLoader.cs

@@ -143,13 +143,13 @@ public partial class GraphicsElementLoader(
     }
 
     private Task<Option<ImageGraphicsElement>> LoadImage(string fileName, Dictionary<string, object> variables) =>
-        GetTemplatedYaml(fileName, variables).Map(FromYaml<ImageGraphicsElement>);
+        GetTemplatedYaml(fileName, variables).BindT(FromYaml<ImageGraphicsElement>);
 
     private Task<Option<TextGraphicsElement>> LoadText(string fileName, Dictionary<string, object> variables) =>
-        GetTemplatedYaml(fileName, variables).Map(FromYaml<TextGraphicsElement>);
+        GetTemplatedYaml(fileName, variables).BindT(FromYaml<TextGraphicsElement>);
 
     private Task<Option<SubtitleGraphicsElement>> LoadSubtitle(string fileName, Dictionary<string, object> variables) =>
-        GetTemplatedYaml(fileName, variables).Map(FromYaml<SubtitleGraphicsElement>);
+        GetTemplatedYaml(fileName, variables).BindT(FromYaml<SubtitleGraphicsElement>);
 
     private async Task<Dictionary<string, object>> InitTemplateVariables(
         GraphicsEngineContext context,
@@ -189,7 +189,7 @@ public partial class GraphicsElementLoader(
         return result;
     }
 
-    private async Task<string> GetTemplatedYaml(string fileName, Dictionary<string, object> variables)
+    private async Task<Option<string>> GetTemplatedYaml(string fileName, Dictionary<string, object> variables)
     {
         string yaml = await localFileSystem.ReadAllText(fileName);
         try
@@ -203,9 +203,10 @@ public partial class GraphicsElementLoader(
             context.PushGlobal(scriptObject);
             return await Template.Parse(yaml).RenderAsync(context);
         }
-        catch (Exception)
+        catch (Exception ex)
         {
-            return yaml;
+            logger.LogWarning(ex, "Failed to load process graphics element YAML definition as template");
+            return Option<string>.None;
         }
     }