1 files changed, 20 insertions, 0 deletions
diff --git a/src/Erebos/Conversation/Class.hs b/src/Erebos/Conversation/Class.hs
new file mode 100644
index 0000000..77458fa
--- /dev/null
+++ b/src/Erebos/Conversation/Class.hs
@@ -0,0 +1,20 @@
+module Erebos.Conversation.Class (
+    ConversationType(..),
+    RefDigest,
+) where
+
+import Data.Text (Text)
+import Data.Time.LocalTime
+import Data.Typeable
+
+import Erebos.Identity
+import Erebos.Object
+
+
+class (Typeable conv, Typeable msg) => ConversationType conv msg | conv -> msg, msg -> conv where
+    convMessageFrom :: msg -> ComposedIdentity
+    convMessageTime :: msg -> ZonedTime
+    convMessageText :: msg -> Maybe Text
+
+    convReference :: conv -> RefDigest
+    convMessageListSince :: Maybe conv -> conv -> [ ( msg, Bool ) ]