fix(Chat): honor joined date when preserving channel order

Prior to this commit, loaded channels and chats would always be
sorted by date of last message received, with the latest one being
moved to the top of the list.

When new channels or chats are joined, they are added on top of the
list as well, however, when the application is restarted,
those new joined chats would not necessarily show up at the top anymore
becaue nothing keeps track of when a channel was joined, which should
be taken into account when preserving the order.

The changes introduced in this commit solve this by introducing a
new `joined` property on the `Chat` type which gets updated with
the current timestamp whenever a channel is joined.

It also depends on the changes made to the `status-go` client, which
have to land first: https://github.com/status-im/status-go/pull/2158

Closes: #1832

src/status/chat.nim

@@ -133,7 +133,8 @@ proc join*(self: ChatModel, chatId: string, chatType: ChatType, ensName: string
 
   var chat = newChat(chatId, ChatType(chatType))
   self.channels[chat.id] = chat
-  status_chat.saveChat(chatId, chatType, color=chat.color, ensName=ensName, profile=pubKey)
+  let joined = times.toUnix(times.getTime()) * 1000
+  status_chat.saveChat(chatId, chatType, color=chat.color, ensName=ensName, profile=pubKey, joined=joined)
   if ensName != "":
     chat.name = ensName
     chat.ensName = ensName

src/status/chat/chat.nim

@@ -67,6 +67,7 @@ type Chat* = ref object
   isActive*: bool # indicates whether the chat has been soft deleted
   chatType*: ChatType
   timestamp*: int64 # indicates the last time this chat has received/sent a message
+  joined*: int64 # indicates when the user joined the chat last time
   lastClockValue*: int64 # indicates the last clock value to be used when sending messages
   deletedAtClockValue*: int64 # indicates the clock value at time of deletion, messages with lower clock value of this should be discarded
   unviewedMessagesCount*: int
@@ -132,7 +133,8 @@ proc toJsonNode*(self: Chat): JsonNode =
     "membershipUpdateEvents": self.membershipUpdateEvents.toJsonNode,
     "name": (if self.ensName != "": self.ensName else: self.name),
     "timestamp": self.timestamp,
-    "unviewedMessagesCount": self.unviewedMessagesCount
+    "unviewedMessagesCount": self.unviewedMessagesCount,
+    "joined": self.joined
   }
 
 proc findIndexById*(self: seq[Chat], id: string): int =

src/status/libstatus/chat.nim

@@ -18,7 +18,7 @@ proc removeFilters*(chatId: string, filterId: string) =
     [{ "ChatID": chatId, "FilterID": filterId }]
   ])
 
-proc saveChat*(chatId: string, chatType: ChatType, active: bool = true, color: string = "#000000", ensName: string = "", profile: string = "") =
+proc saveChat*(chatId: string, chatType: ChatType, active: bool = true, color: string = "#000000", ensName: string = "", profile: string = "", joined: int64 = 0) =
   # TODO: ideally status-go/stimbus should handle some of these fields instead of having the client
   # send them: lastMessage, unviewedMEssagesCount, timestamp, lastClockValue, name?
   discard callPrivateRPC("saveChat".prefix, %* [
@@ -32,7 +32,8 @@ proc saveChat*(chatId: string, chatType: ChatType, active: bool = true, color: s
       "id": chatId,
       "unviewedMessagesCount": 0, # TODO:
       "chatType":  chatType.int,
-      "timestamp": 1588940692659  # TODO:
+      "timestamp": 1588940692659,  # TODO:
+      "joined": joined
     }
   ])
 
@@ -40,9 +41,17 @@ proc deactivateChat*(chat: Chat) =
   chat.isActive = false
   discard callPrivateRPC("saveChat".prefix, %* [chat.toJsonNode])
 
-proc sortChats(x, y: Chat): int = 
-  if x.lastMessage.whisperTimestamp > y.lastMessage.whisperTimestamp: 1
-  elif x.lastMessage.whisperTimestamp == y.lastMessage.whisperTimestamp: 0
+proc sortChats(x, y: Chat): int =
+  var t1 = x.lastMessage.whisperTimestamp
+  var t2 = y.lastMessage.whisperTimestamp
+
+  if t1 <= $x.joined:
+    t1 = $x.joined
+  if t2 <= $y.joined:
+    t2 = $y.joined
+
+  if t1 > t2: 1
+  elif t1 == t2: 0
   else: -1
 
 proc loadChats*(): seq[Chat] =

src/status/signals/messages.nim

@@ -141,7 +141,8 @@ proc toChat*(jsonChat: JsonNode): Chat =
     unviewedMessagesCount: jsonChat{"unviewedMessagesCount"}.getInt,
     hasMentions: false,
     muted: false,
-    ensName: ""
+    ensName: "",
+    joined: 0
   )
 
   if jsonChat.hasKey("muted") and jsonChat["muted"].kind != JNull: 
@@ -149,6 +150,9 @@ proc toChat*(jsonChat: JsonNode): Chat =
 
   if jsonChat["lastMessage"].kind != JNull: 
     result.lastMessage = jsonChat{"lastMessage"}.toMessage(pk)
+
+  if jsonChat.hasKey("joined") and jsonChat["joined"].kind != JNull:
+    result.joined = jsonChat{"joined"}.getInt
   
   if result.chatType == ChatType.OneToOne:
     result.identicon = generateIdenticon(result.id)

vendor/status-go

@@ -1 +1 @@
-Subproject commit 6037570901233477cbef85d5494b257076a3acd9
+Subproject commit dd49e604d49a2906dfad6ac1e459b72de014e2c0