Encoding: need to include associated chat item guids.

Beginning to understand associated chat items (reactions, etc).

kordophone/Categories/IMChat+Encoded.m

@@ -20,6 +20,13 @@
     chatDict[@"date"] = MBIMWebServerFormatISO8601([self lastFinishedMessageDate]);
     chatDict[@"unreadCount"] = @([self unreadMessageCount]);
     
+    // NOTE: -[IMChat lastMessage] != -[[IMChat chatItems] lastMessage].
+    // This means the messages we get back from the message list operation might be different from this here, which means we
+    // can't reliably use `lastMessage.guid` as a sync anchor.
+    //
+    // Ideally, everything should move to use chat items instead of messages so we can handle associated message items (reactions).
+    // When that happens, we should use `lastFinishedMessageItem` here instead of `lastMessage`, and avoid the db hit.
+    //
     IMMessage *lastMessage = [self lastMessage];
     if (lastMessage) {
         NSString *lastMessagePreview = [lastMessage descriptionForPurpose:IMMessageDescriptionConversationList];

kordophone/Categories/IMMessageItem+Encoded.m

@@ -9,6 +9,40 @@
 #import "IMMessageItem+Encoded.h"
 #import "MBIMHTTPUtilities.h"
 
+static NSString* IMAssociatedMessageTypeValue(IMAssociatedMessageType type) {
+    switch (type) {
+        case IMAssociatedMessageTypeAcknowledgmentHeart:
+            return @"heart";
+        case IMAssociatedMessageTypeAcknowledgmentThumbsUp:
+            return @"thumbsUp";
+        case IMAssociatedMessageTypeAcknowledgmentThumbsDown:
+            return @"thumbsDown";
+        case IMAssociatedMessageTypeAcknowledgmentHa:
+            return @"ha";
+        case IMAssociatedMessageTypeAcknowledgmentExclamation:
+            return @"exclamation";
+        case IMAssociatedMessageTypeAcknowledgmentQuestionMark:
+            return @"questionMark";
+            
+        case IMAssociatedMessageTypeAcknowledgmentHeartRemoved:
+            return @"removed heart";
+        case IMAssociatedMessageTypeAcknowledgmentThumbsUpRemoved:
+            return @"removed thumbsUp";
+        case IMAssociatedMessageTypeAcknowledgmentThumbsDownRemoved:
+            return @"removed thumbsDown";
+        case IMAssociatedMessageTypeAcknowledgmentHaRemoved:
+            return @"removed ha";
+        case IMAssociatedMessageTypeAcknowledgmentExclamationRemoved:
+            return @"removed exclamation";
+        case IMAssociatedMessageTypeAcknowledgmentQuestionMarkRemoved:
+            return @"removed questionMark";
+            
+        case IMAssociatedMessageTypeUnspecified:
+        default:
+            return @"unknown";
+    }
+}
+
 @implementation IMMessage (Encoded)
 
 - (NSDictionary *)mbim_dictionaryRepresentation
@@ -19,6 +53,15 @@
     messageDict[@"sender"] = ([self isFromMe] ? nil : [[self sender] displayID]); // TODO: nil sender is still a weird way to represent this...
     messageDict[@"guid"] = [self guid];
     
+    if ([self associatedMessageGUID]) {
+        NSString *encodedAssociatedMessageGUID = [self associatedMessageGUID];
+        messageDict[@"associatedMessageGUID"] = encodedAssociatedMessageGUID;
+        messageDict[@"associatedMessageType"] = IMAssociatedMessageTypeValue([self associatedMessageType]);
+        
+        NSString *decodedAssociatedChatItemGUID = IMAssociatedMessageDecodeGUID(encodedAssociatedMessageGUID);
+        if (decodedAssociatedChatItemGUID) messageDict[@"associatedChatItemGUID"] = decodedAssociatedChatItemGUID;
+    }
+    
     if ([self fileTransferGUIDs]) {
         // Support only images right now
         NSMutableDictionary *attachmentMetadatas = [NSMutableDictionary dictionary];