From 509173079648f080cf6dfa92f368831fb41d5b42 Mon Sep 17 00:00:00 2001
From: Zeeshan Mustafa <zeeshan.mustafa91@gmail.com>
Date: Thu, 9 May 2024 15:45:09 +0500
Subject: [PATCH] Fixed issue #207 - Error Deserializing ChatMessage

---
 OpenAI_API/Chat/ChatMessage.cs    | 25 +++++++++----
 OpenAI_Tests/ChatEndpointTests.cs | 58 +++++++++++++++++++++++++++++--
 2 files changed, 74 insertions(+), 9 deletions(-)

diff --git a/OpenAI_API/Chat/ChatMessage.cs b/OpenAI_API/Chat/ChatMessage.cs
index 7d77142..41d8fc9 100644
--- a/OpenAI_API/Chat/ChatMessage.cs
+++ b/OpenAI_API/Chat/ChatMessage.cs
@@ -159,9 +159,12 @@ public string Text
 
 				set
 				{
-					text = value;
-					image = null;
-					Type = "text";
+					if (value != null)
+					{
+						text = value;
+						image = null;
+						Type = "text";
+					}
 				}
 			}
 
@@ -181,9 +184,12 @@ public ImageInput Image
 
 				set
 				{
-					image = value;
-					text = null;
-					Type = "image_url";
+					if (value != null)
+					{
+						image = value;
+						text = null;
+						Type = "image_url";
+					}
 				}
 			}
 
@@ -244,6 +250,11 @@ public ImageInput(string url, string detail = "auto")
 				this.Detail = detail;
 			}
 
+            /// <summary>
+            /// Creates an empty <see cref="ImageInput"/>
+            /// </summary>
+            public ImageInput() { }
+
 			/// <summary>
 			/// Instantiates a new ImageInput object with the given image data bytes
 			/// </summary>
@@ -312,7 +323,7 @@ public override bool CanConvert(Type objectType)
 			public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
 			{
 				JToken token = JToken.Load(reader);
-				if (token.Type == JTokenType.Object)
+				if (token.Type == JTokenType.Object || token.Type == JTokenType.Array)
 				{
 					return token.ToObject<IList<ContentItem>>();
 				}
diff --git a/OpenAI_Tests/ChatEndpointTests.cs b/OpenAI_Tests/ChatEndpointTests.cs
index f05b4e3..5167485 100644
--- a/OpenAI_Tests/ChatEndpointTests.cs
+++ b/OpenAI_Tests/ChatEndpointTests.cs
@@ -28,7 +28,7 @@ public void BasicCompletion()
 
 			Assert.IsNotNull(api.Chat);
 
-			var results = api.Chat.CreateChatCompletionAsync(new ChatRequest()
+            var results = api.Chat.CreateChatCompletionAsync(new ChatRequest()
 			{
 				Model = Model.ChatGPTTurbo,
 				Temperature = 0.1,
@@ -566,5 +566,59 @@ public async Task DifferentSeedShouldBeDifferentOutput()
 				Assert.AreNotEqual(jokeA, jokeB);
 			}
 		}
-	}
+
+        [Test]
+        public void ChatMessageSerializationShouldDeserialzeAsExpected()
+        {
+			var msg = new ChatMessage()
+			{
+				Role = ChatMessageRole.User,
+				TextContent = "This is a test"
+			};
+			var jmsg = JsonConvert.SerializeObject(msg);
+			var deserializedMsg = JsonConvert.DeserializeObject<ChatMessage>(jmsg);
+
+			Assert.IsNotNull(deserializedMsg);
+			Assert.IsTrue(msg.TextContent.Equals(deserializedMsg.TextContent));
+			Assert.IsTrue(deserializedMsg.Images.Count == msg.Images.Count);
+        }
+
+        [Test]
+        public void ChatMessagesContentSerializationShouldDeserialzeAsExpected()
+        {
+           
+            var msg = new ChatMessage(ChatMessageRole.User, "What is this image about?", new ChatMessage.ImageInput[] { new ChatMessage.ImageInput("https://xyz.com/image.png") });
+            
+            var jmsg = JsonConvert.SerializeObject(msg);
+            var deserializedMsg = JsonConvert.DeserializeObject<ChatMessage>(jmsg);
+
+            Assert.IsNotNull(deserializedMsg);
+            Assert.IsTrue(msg.TextContent.Equals(deserializedMsg.TextContent));
+            Assert.IsTrue(deserializedMsg.Images.Count == msg.Images.Count);
+			Assert.IsTrue(deserializedMsg.Images[0].Url.Equals(msg.Images[0].Url));
+        }
+
+        [Test]
+        public void ChatMessagesListSerializationShouldDeserialzeAsExpected()
+        {
+            var messages = new List<ChatMessage>();
+            var msg1 = new ChatMessage(ChatMessageRole.User, "What is this image about?", new ChatMessage.ImageInput[] { new ChatMessage.ImageInput("https://xyz.com/image.png") });
+            messages.Add(msg1);
+            var msg2 = new ChatMessage(ChatMessageRole.User, "And what is this image about?", new ChatMessage.ImageInput[] { new ChatMessage.ImageInput("https://xyz.com/image2.png") });
+            messages.Add(msg2);
+
+            var jmsgs = JsonConvert.SerializeObject(messages);
+            var deserializedMessagesList = JsonConvert.DeserializeObject<List<ChatMessage>>(jmsgs);
+
+            Assert.IsNotNull(deserializedMessagesList);
+			Assert.IsTrue(deserializedMessagesList.Count == messages.Count);
+			Assert.IsTrue(deserializedMessagesList[0].TextContent.Equals(messages[0].TextContent));
+			Assert.IsTrue(deserializedMessagesList[0].Images.Count == messages[0].Images.Count);
+			Assert.IsTrue(deserializedMessagesList[0].Images[0].Url.Equals(messages[0].Images[0].Url));
+
+            Assert.IsTrue(deserializedMessagesList[1].TextContent.Equals(messages[1].TextContent));
+            Assert.IsTrue(deserializedMessagesList[1].Images.Count == messages[1].Images.Count);
+            Assert.IsTrue(deserializedMessagesList[1].Images[0].Url.Equals(messages[1].Images[0].Url));
+        }
+    }
 }