From 649b22768e25c96237e73ac2817ec186cbe191ad Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Wed, 5 Feb 2020 11:56:03 +0000
Subject: [PATCH] Define newer room versions

---
 roomserver/version/version.go | 56 +++++++++++++++++++++++++++++++----
 1 file changed, 51 insertions(+), 5 deletions(-)

diff --git a/roomserver/version/version.go b/roomserver/version/version.go
index afb28a056..6c726991f 100644
--- a/roomserver/version/version.go
+++ b/roomserver/version/version.go
@@ -7,24 +7,70 @@ import (
 )
 
 type RoomVersionID int
+type EventFormatID int
 
 const (
 	RoomVersionV1 RoomVersionID = iota + 1
+	RoomVersionV2
+	RoomVersionV3
+	RoomVersionV4
+	RoomVersionV5
+)
+
+const (
+	EventFormatV1 EventFormatID = iota + 1
+	EventFormatV2
+	EventFormatV3
 )
 
 type RoomVersionDescription struct {
+	Supported       bool
 	Stable          bool
 	StateResolution state.StateResolutionVersion
+	EventFormat     EventFormatID
 }
 
-func GetRoomVersionDescription(version RoomVersionID) (RoomVersionDescription, error) {
+func GetRoomVersionDescription(version RoomVersionID) (desc RoomVersionDescription, err error) {
 	switch version {
 	case RoomVersionV1:
-		return RoomVersionDescription{
+		desc = RoomVersionDescription{
+			Supported:       true,
 			Stable:          true,
-			StateResolution: state.StateResolutionV1,
-		}, nil
+			StateResolution: state.StateResolutionAlgorithmV1,
+			EventFormat:     EventFormatV1,
+		}
+	case RoomVersionV2:
+		desc = RoomVersionDescription{
+			Supported:       false,
+			Stable:          true,
+			StateResolution: state.StateResolutionAlgorithmV2,
+			EventFormat:     EventFormatV1,
+		}
+	case RoomVersionV3:
+		desc = RoomVersionDescription{
+			Supported:       false,
+			Stable:          true,
+			StateResolution: state.StateResolutionAlgorithmV2,
+			EventFormat:     EventFormatV1,
+		}
+	case RoomVersionV4:
+		desc = RoomVersionDescription{
+			Supported:       false,
+			Stable:          true,
+			StateResolution: state.StateResolutionAlgorithmV2,
+			EventFormat:     EventFormatV2,
+		}
+	case RoomVersionV5:
+		desc = RoomVersionDescription{
+			Supported:       false,
+			Stable:          true,
+			StateResolution: state.StateResolutionAlgorithmV2,
+			EventFormat:     EventFormatV3,
+		}
 	default:
-		return nil, errors.New("unsupported room version")
 	}
+	if !desc.Supported {
+		err = errors.New("unsupported room version")
+	}
+	return
 }