feat: create chat message

src/AnthropicClient/Json/ContentConverter.cs

@@ -0,0 +1,29 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+using AnthropicClient.Models;
+
+namespace AnthropicClient.Json;
+
+class ContentConverter : JsonConverter<Content>
+{
+  public override Content Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+  {
+    using var jsonDocument = JsonDocument.ParseValue(ref reader);
+    var root = jsonDocument.RootElement;
+    var type = root.GetProperty("type").GetString();
+    return type switch
+    {
+      ContentType.Text => JsonSerializer.Deserialize<TextContent>(root.GetRawText(), options)!,
+      ContentType.Image => JsonSerializer.Deserialize<ImageContent>(root.GetRawText(), options)!,
+      ContentType.ToolUse => JsonSerializer.Deserialize<ToolUseContent>(root.GetRawText(), options)!,
+      ContentType.ToolResult => JsonSerializer.Deserialize<ToolResultContent>(root.GetRawText(), options)!,
+      _ => throw new JsonException($"Unknown content type: {type}")
+    };
+  }
+
+  public override void Write(Utf8JsonWriter writer, Content value, JsonSerializerOptions options)
+  {
+    JsonSerializer.Serialize(writer, value, value.GetType(), options);
+  }
+}