Offer Retry and Remove actions with a reason when tapping a failed message

Tapping the red (!) on a message that failed to send used to show a bare
"Sending failed" alert with only an OK button. Now the alert includes the
failure reason from the SDK (e.g. the HTTP error that caused it) and offers
Retry sending, Remove message and Cancel actions, wired to the send handle's
resend and to redacting the local echo respectively.

ElementX/Sources/Screens/Timeline/TimelineModels.swift

@@ -222,7 +222,7 @@ struct ReadReceiptSummaryInfo: Identifiable {
 enum TimelineAlertInfoType: Hashable {
     case audioRecodingPermissionError
     case pollEndConfirmation(String)
-    case sendingFailed
+    case sendingFailed(reason: String?, itemID: TimelineItemIdentifier)
     case encryptionAuthenticity(String)
     case encryptionForwarder(String)
     case inviteAgain

ElementX/Sources/Screens/Timeline/TimelineViewModel.swift

@@ -738,8 +738,8 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
             fatalError("Only events can have send info.")
         }
         
-        if case .sendingFailed(.unknown) = eventTimelineItem.properties.deliveryStatus {
-            displayAlert(.sendingFailed)
+        if case let .sendingFailed(.unknown(reason)) = eventTimelineItem.properties.deliveryStatus {
+            displayAlert(.sendingFailed(reason: reason, itemID: itemID))
         } else if case let .sendingFailed(.verifiedUser(failure)) = eventTimelineItem.properties.deliveryStatus {
             guard let sendHandle = timelineController.sendHandle(for: itemID) else {
                 MXLog.error("Cannot find send handle for \(itemID).")
@@ -755,6 +755,27 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
             displayAlert(.encryptionAuthenticity(authenticityMessage))
         }
     }
+
+    private func retrySending(itemID: TimelineItemIdentifier) {
+        guard let sendHandle = timelineController.sendHandle(for: itemID) else {
+            MXLog.error("Cannot find send handle for \(itemID).")
+            return
+        }
+
+        Task {
+            if case .failure(let error) = await sendHandle.resend() {
+                MXLog.error("Failed retrying to send \(itemID): \(error)")
+            }
+        }
+    }
+
+    private func removeFailedMessage(itemID: TimelineItemIdentifier) {
+        guard case let .event(_, eventOrTransactionID) = itemID else {
+            fatalError("Only events can fail to send.")
+        }
+
+        Task { await timelineController.redact(eventOrTransactionID) }
+    }
     
     private func slashCommand(message: String) -> SlashCommand? {
         for command in SlashCommand.allCases where message.starts(with: command.rawValue) {
@@ -1103,10 +1124,13 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
                                              message: L10n.commonPollEndConfirmation,
                                              primaryButton: .init(title: L10n.actionCancel, role: .cancel, action: nil),
                                              secondaryButton: .init(title: L10n.actionOk) { self.timelineInteractionHandler.endPoll(pollStartID: pollStartID) })
-        case .sendingFailed:
+        case .sendingFailed(let reason, let itemID):
             state.bindings.alertInfo = .init(id: type,
                                              title: L10n.commonSendingFailed,
-                                             primaryButton: .init(title: L10n.actionOk, action: nil))
+                                             message: reason,
+                                             primaryButton: .init(title: L10n.actionCancel, role: .cancel, action: nil),
+                                             verticalButtons: [.init(title: L10n.actionRetry) { [weak self] in self?.retrySending(itemID: itemID) },
+                                                               .init(title: L10n.actionRemoveMessage, role: .destructive) { [weak self] in self?.removeFailedMessage(itemID: itemID) }])
         case .encryptionAuthenticity(let message):
             state.bindings.alertInfo = .init(id: type,
                                              title: message,

ElementX/Sources/Screens/Timeline/View/ItemMenu/TimelineItemMenu.swift

@@ -262,7 +262,7 @@ struct TimelineItemMenu_Previews: PreviewProvider, TestablePreview {
     static let (backupItem, _) = makeActions(authenticity: .notGuaranteed(color: .gray))
     static let (unsignedItem, _) = makeActions(authenticity: .unsignedDevice(color: .red))
     static let (unencryptedItem, _) = makeActions(authenticity: .sentInClear(color: .red))
-    static let (unknownFailureItem, _) = makeActions(deliveryStatus: .sendingFailed(.unknown))
+    static let (unknownFailureItem, _) = makeActions(deliveryStatus: .sendingFailed(.unknown(reason: nil)))
     static let (identityChangedItem, _) = makeActions(deliveryStatus: .sendingFailed(.verifiedUser(.changedIdentity(users: [
         "@alice:matrix.org"
     ]))))

ElementX/Sources/Screens/Timeline/View/Style/TimelineStyler.swift

@@ -92,7 +92,7 @@ struct TimelineItemStyler_Previews: PreviewProvider, TestablePreview {
     
     static let failed: TextRoomTimelineItem = {
         var result = base
-        result.properties.deliveryStatus = .sendingFailed(.unknown)
+        result.properties.deliveryStatus = .sendingFailed(.unknown(reason: nil))
         return result
     }()