Update EventOccurrence parsing to use EventOccurrenceParseGroup for improved data structure

This commit refactors the EventOccurrence parsing logic to utilize the EventOccurrenceParseGroup class, enhancing the organization of parsed occurrences by grouping them based on event definitions and optional section levels. The changes include updates to the EventOccurrenceParseResult, EventOccurrenceParser, and EventOccurrenceParserService to accommodate the new grouping structure. Additionally, tests are modified to reflect these changes, ensuring that the parsing functionality remains intact and accurate. This refactor improves data handling and aligns with the overall architecture of the application.

Core/Parsers/EventOccurrenceParser.cs

@@ -1,4 +1,4 @@
-using System.Text.RegularExpressions;
+using System.Text.RegularExpressions;
 using Core.Entities;
 using Core.Models;
 using EventOccurrenceParsers = Core.Parsers.EventOccurrence;
@@ -12,7 +12,7 @@ namespace Core.Parsers;
 /// </summary>
 public class EventOccurrenceParserResult
 {
-    public IDictionary<EventDefinition, List<Entities.EventOccurrence>> Occurrences { get; set; } = new Dictionary<EventDefinition, List<Entities.EventOccurrence>>();
+    public IDictionary<EventOccurrenceParseGroup, List<Entities.EventOccurrence>> Occurrences { get; set; } = new Dictionary<EventOccurrenceParseGroup, List<Entities.EventOccurrence>>();
     public List<ParsingIssue> Issues { get; set; } = new();
     public List<string> SkippedSectionHeaders { get; set; } = new();
     public int SkippedEventCount { get; set; }
@@ -296,12 +296,14 @@ public class EventOccurrenceParser
 				Location = location
 			};
 
-			if (!occurrences.ContainsKey(eventDefinition))
-				occurrences.Add(eventDefinition, []);
-			occurrences[eventDefinition].Add(eventOccurrence);
-			
-			// Reset section level when we successfully parse an occurrence (means we're in a valid section)
-			currentSectionLevel = null;
+			var groupKey = new EventOccurrenceParseGroup(eventDefinition, currentSectionLevel);
+			if (!occurrences.TryGetValue(groupKey, out var groupList))
+			{
+				groupList = [];
+				occurrences[groupKey] = groupList;
+			}
+
+			groupList.Add(eventOccurrence);
         }
 
         return result;