From d9b6062767b31ce5bfa362a30ad696419d1afc3b Mon Sep 17 00:00:00 2001
From: glax <johanna@bernloehr.eu>
Date: Wed, 31 May 2023 21:43:07 +0200
Subject: [PATCH] Custom JSON Deserializer for concrete classes of abstract
 class TrangaTask

---
 Tranga/TaskManager.cs |  2 +-
 Tranga/TrangaTask.cs  | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/Tranga/TaskManager.cs b/Tranga/TaskManager.cs
index 81e7ada..bbdc0eb 100644
--- a/Tranga/TaskManager.cs
+++ b/Tranga/TaskManager.cs
@@ -307,7 +307,7 @@ public class TaskManager
         {
             logger?.WriteLine(this.GetType().ToString(), $"Importing tasks from {settings.tasksFilePath}");
             buffer = File.ReadAllText(settings.tasksFilePath);
-            this._allTasks = JsonConvert.DeserializeObject<HashSet<TrangaTask>>(buffer)!;
+            this._allTasks = JsonConvert.DeserializeObject<HashSet<TrangaTask>>(buffer, new JsonSerializerSettings() { Converters = { new TrangaTask.TrangaTaskJsonConverter() } })!;
         }
 
         if (File.Exists(settings.knownPublicationsPath))
diff --git a/Tranga/TrangaTask.cs b/Tranga/TrangaTask.cs
index c8a6287..4cb2206 100644
--- a/Tranga/TrangaTask.cs
+++ b/Tranga/TrangaTask.cs
@@ -1,4 +1,6 @@
 using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Tranga.TrangaTasks;
 
 namespace Tranga;
 
@@ -56,4 +58,31 @@ public abstract class TrangaTask
     {
         return $"{task}, {lastExecuted}, {reoccurrence}, {state} {(connectorName is not null ? $", {connectorName}" : "" )} {(publication is not null ? $", {publication?.sortName}": "")}";
     }
+    
+    public class TrangaTaskJsonConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return (objectType == typeof(TrangaTask));
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
+        {
+            JObject jo = JObject.Load(reader);
+            if (jo["task"]!.Value<Int64>() == (Int64)Task.DownloadNewChapters)
+                return jo.ToObject<DownloadNewChaptersTask>(serializer)!;
+
+            if (jo["task"]!.Value<Int64>() == (Int64)Task.UpdateKomgaLibrary)
+                return jo.ToObject<UpdateKomgaLibraryTask>(serializer)!;
+
+            throw new Exception();
+        }
+
+        public override bool CanWrite => false;
+
+        public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
+        {
+            throw new Exception("Dont call this");
+        }
+    }
 }
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