added encounter system

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

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Jovian.EncounterSystem {
+    [CreateAssetMenu(fileName = "EncounterTable", menuName = "Jovian/Encounter System/Encounter Table", order = 1)]
+    public class EncounterTable : ScriptableObject {
+        public string id;
+        public List<Encounter> encounters;
+
+        public IEncounter GetRandomEncounter() {
+            if(encounters == null || encounters.Count == 0) {
+                return null;
+            }
+
+            return encounters[UnityEngine.Random.Range(0, encounters.Count)];
+        }
+
+        public IEncounter GetRandomEncounter(Type type) {
+            if(encounters == null || encounters.Count == 0) {
+                return null;
+            }
+
+            var encountersOfType = encounters.FindAll(encounter => encounter.GetType() == type);
+            if(encountersOfType.Count > 0) {
+                return encountersOfType[UnityEngine.Random.Range(0, encountersOfType.Count)];
+            }
+
+            return null;
+        }
+
+        /// <summary>Random pick limited by a predicate. Used with <see cref="QuestProgress.IsGated"/> to exclude gated encounters.</summary>
+        public IEncounter GetRandomEncounter(Predicate<IEncounter> filter) {
+            if(encounters == null || encounters.Count == 0 || filter == null) {
+                return GetRandomEncounter();
+            }
+
+            var pool = encounters.FindAll(filter);
+            if(pool.Count == 0) {
+                return null;
+            }
+
+            return pool[UnityEngine.Random.Range(0, pool.Count)];
+        }
+    }
+}