added encounter system

Packages/com.jovian.encounter-system/Runtime/QuestLog.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Jovian.EncounterSystem {
+    public enum QuestLogEventType {
+        Started,
+        Advanced,
+        Completed
+    }
+
+    [Serializable]
+    public class QuestLogEntry {
+        public QuestLogEventType type;
+        public string encounterInternalId;
+        public string encounterName;
+        public string fromEncounterName;
+    }
+
+    /// <summary>
+    /// Chronological, serialisable record of quest events. Subscribes at construction —
+    /// build before any encounter fires or early entries will be missed.
+    /// </summary>
+    public class QuestLog {
+        private readonly List<QuestLogEntry> entries = new();
+
+        public IReadOnlyList<QuestLogEntry> Entries => entries;
+
+        public QuestLog(QuestProgress progress) {
+            progress.QuestStarted += quest => Record(QuestLogEventType.Started, null, quest);
+            progress.QuestAdvanced += (from, to) => Record(QuestLogEventType.Advanced, from, to);
+            progress.QuestCompleted += quest => Record(QuestLogEventType.Completed, null, quest);
+        }
+
+        public List<QuestLogEntry> CreateSnapshot() {
+            return new List<QuestLogEntry>(entries);
+        }
+
+        public void Restore(IEnumerable<QuestLogEntry> saved) {
+            entries.Clear();
+            if(saved == null) {
+                return;
+            }
+
+            entries.AddRange(saved);
+        }
+
+        public IEnumerable<string> ResolvedEncounterIds() {
+            return entries
+                .Select(entry => entry.encounterInternalId)
+                .Where(id => !string.IsNullOrEmpty(id));
+        }
+
+        private void Record(QuestLogEventType type, IEncounter from, IEncounter to) {
+            entries.Add(new QuestLogEntry {
+                type = type,
+                encounterInternalId = to?.EncounterDefinition?.internalId,
+                encounterName = to?.EncounterDefinition?.name,
+                fromEncounterName = from?.EncounterDefinition?.name
+            });
+        }
+    }
+}