Implement resending of failed messages

Session/Conversations V2/ConversationVC+Interaction.swift

@@ -85,6 +85,9 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
     }
 
     func handleViewItemTapped(_ viewItem: ConversationViewItem, gestureRecognizer: UITapGestureRecognizer) {
+        if let message = viewItem.interaction as? TSOutgoingMessage, message.messageState == .failed {
+            showFailedMessageSheet(for: message)
+        } else {
             switch viewItem.messageCellType {
             case .audio: playOrPauseAudio(for: viewItem)
             case .mediaMessage:
@@ -121,6 +124,7 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
             default: break
             }
         }
+    }
 
     func handleViewItemDoubleTapped(_ viewItem: ConversationViewItem) {
         switch viewItem.messageCellType {

Session/Conversations V2/ConversationVC.swift

@@ -4,7 +4,6 @@
 // • Mentions
 // • Remaining send logic
 // • Subtitle
-// • Resending failed messages
 // • Slight paging glitch
 // • Scrolling bug
 // • Scroll button bug
@@ -362,6 +361,33 @@ final class ConversationVC : BaseVC, ConversationViewModelDelegate, UITableViewD
         present(linkPreviewModel, animated: true, completion: nil)
     }
 
+    func showFailedMessageSheet(for tsMessage: TSOutgoingMessage) {
+        let thread = self.thread
+        let sheet = UIAlertController(title: tsMessage.mostRecentFailureText, message: nil, preferredStyle: .actionSheet)
+        sheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
+        sheet.addAction(UIAlertAction(title: "Delete", style: .destructive, handler: { _ in
+            Storage.write { transaction in
+                tsMessage.remove(with: transaction)
+                Storage.shared.cancelPendingMessageSendJobIfNeeded(for: tsMessage.timestamp, using: transaction)
+            }
+        }))
+        sheet.addAction(UIAlertAction(title: "Resend", style: .default, handler: { _ in
+            let message = VisibleMessage.from(tsMessage)
+            Storage.write { transaction in
+                var attachments: [TSAttachmentStream] = []
+                tsMessage.attachmentIds.forEach { attachmentID in
+                    guard let attachmentID = attachmentID as? String else { return }
+                    let attachment = TSAttachment.fetch(uniqueId: attachmentID, transaction: transaction)
+                    guard let stream = attachment as? TSAttachmentStream else { return }
+                    attachments.append(stream)
+                }
+                MessageSender.prep(attachments, for: message, using: transaction)
+                MessageSender.send(message, in: thread, using: transaction)
+            }
+        }))
+        present(sheet, animated: true, completion: nil)
+    }
+    
     // MARK: Convenience
     private func getTitle() -> String {
         if let thread = thread as? TSGroupThread {

Session/Conversations V2/Message Cells/VisibleMessageCell.swift

@@ -480,7 +480,7 @@ final class VisibleMessageCell : MessageCell, LinkPreviewViewV2Delegate {
         case .read:
             backgroundColor = isLightMode ? .black : .white
             image = isLightMode ? #imageLiteral(resourceName: "FilledCircleCheckLightMode") : #imageLiteral(resourceName: "FilledCircleCheckDarkMode")
-        case .failed: image = #imageLiteral(resourceName: "message_status_failed").asTintedImage(color: Colors.text)!
+        case .failed: image = #imageLiteral(resourceName: "message_status_failed").asTintedImage(color: Colors.destructive)!
         }
         return (image, backgroundColor)
     }

Session/Conversations V2/Views & Modals/LinkPreviewModal.swift

@@ -27,7 +27,7 @@ final class LinkPreviewModal : Modal {
         let messageLabel = UILabel()
         messageLabel.textColor = Colors.text
         messageLabel.font = .systemFont(ofSize: Values.smallFontSize)
-        let message = "Session can show previews for URLs. This will make your messaging experience nicer, but to generate a preview Session needs to contact the website in question. You can always disable link previews in the in-app settings."
+        let message = "Enabling link previews will show previews for URLs you send and receive. This can be useful, but Session will need to contact linked websites to generate previews. You can always disable link previews in Session's settings."
         messageLabel.text = message
         messageLabel.numberOfLines = 0
         messageLabel.lineBreakMode = .byWordWrapping