1 files changed, 54 insertions, 0 deletions
diff --git a/LibMatrix.EventTypes.Abstractions/BaseMatrixEventContent.cs b/LibMatrix.EventTypes.Abstractions/BaseMatrixEventContent.cs
new file mode 100644
index 0000000..eba50a5
--- /dev/null
+++ b/LibMatrix.EventTypes.Abstractions/BaseMatrixEventContent.cs
@@ -0,0 +1,54 @@
+using System.Reflection;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
+using ArcaneLibs.Extensions;
+
+namespace LibMatrix.EventTypes;
+
+// <T> : MatrixEventContent where T : MatrixEventContent<T>, new() {
+/// <summary>
+///     Extensible Event Content, aims to provide an API similar to JsonNode/JsonObject
+///     <seealso cref="System.Text.Json.Nodes.JsonNode"/>
+///     <seealso cref="System.Text.Json.Nodes.JsonObject"/>
+/// </summary>
+[JsonConverter(typeof(MatrixEventContentConverter<BaseMatrixEventContent>))]
+// [JsonSerializable(typeof(MatrixEventContent))]
+public class BaseMatrixEventContent {
+    public JsonObject InternalJson { get; set; } = new();
+
+    public BaseMatrixEventContent() { }
+
+    public BaseMatrixEventContent(JsonNode json) {
+        InternalJson = json.AsObject();
+    }
+
+    public static implicit operator BaseMatrixEventContent(JsonNode json) => new(json);
+
+    // public static implicit operator JsonNode(MatrixEventContent content) => content.InternalJson;
+
+    [JsonIgnore]
+    public IEnumerable<string> EventTypes => this.GetType().GetCustomAttributes<MatrixEventAttribute>().Select(x => x.EventType);
+
+    [JsonIgnore]
+    public string EventType => EventTypes.First();
+
+    public JsonNode? this[string key] => InternalJson[key];
+    
+    public string ToJson() => InternalJson.ToJson();
+
+
+    public class MatrixEventContentConverter<T> : JsonConverter<T> where T : BaseMatrixEventContent, new() {
+        public override T? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) {
+            // read entire object into a JsonObject
+            // Console.WriteLine($"MatrixEventContentConverter<T>: Reading {typeToConvert}");
+            var json = JsonNode.Parse(ref reader);
+            return new T { InternalJson = json.AsObject() };
+        }
+
+        public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options) {
+            // Console.WriteLine($"MatrixEventContentConverter<T>: Writing {value.GetType()}");
+            value.InternalJson.WriteTo(writer);
+        }
+    }
+}
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