feat: add thread info and status reads

tests/test_store_memory.py

@@ -1,3 +1,5 @@
+import uuid
+
 from agentmsgs.stores.memory import InMemoryStore
 
 
@@ -36,3 +38,51 @@ def test_memory_append_and_list():
     m2 = s.append_message(t.id, b, "yo")
     assert m1.seq == 1 and m2.seq == 2
     assert s.list_messages(t.id, after_seq=1) == [m2]
+
+
+def test_memory_thread_info_and_read_state():
+    s = InMemoryStore()
+    a = s.get_or_create_agent("A")
+    b = s.get_or_create_agent("B")
+    t = s.create_thread({a, b})
+    s.append_message(t.id, a, "one")
+    s.append_message(t.id, b, "two")
+    m3 = s.append_message(t.id, a, "three")
+
+    info = s.get_thread_info(t.id)
+    assert info is not None
+    assert info.thread == t
+    assert info.message_count == 3
+    assert info.latest_message == m3
+
+    state = s.get_thread_read_state(t.id, a)
+    assert state.agent == a
+    assert state.cursor_seq == 0
+    assert state.latest_seq == 3
+    assert state.unread_count == 3
+    assert state.unread_from_others_count == 1
+
+    s.set_cursor(t.id, a, 2)
+    state = s.get_thread_read_state(t.id, a)
+    assert state.cursor_seq == 2
+    assert state.unread_count == 1
+    assert state.unread_from_others_count == 0
+
+
+def test_memory_thread_info_for_empty_thread():
+    s = InMemoryStore()
+    a = s.get_or_create_agent("A")
+    b = s.get_or_create_agent("B")
+    t = s.create_thread({a, b})
+
+    info = s.get_thread_info(t.id)
+    state = s.get_thread_read_state(t.id, a)
+
+    assert info is not None
+    assert info.message_count == 0
+    assert info.latest_message is None
+    assert state.latest_seq == 0
+    assert state.unread_count == 0
+    assert state.unread_from_others_count == 0
+    assert s.get_thread_info(uuid.uuid4()) is None
+    assert s.get_thread_read_state(uuid.uuid4(), a) is None