conversation: remove when contact is discarded

Remove conversation that contain only generated messages when contact
request is discarded

Change-Id: Ib7c393c658013780f1a8bf8a20c40f87a40b563c
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>

Ring/Ring/Services/ContactRequestManager.swift

@@ -85,6 +85,12 @@ class ContactRequestManager {
                     type = GeneratedMessageType.sendContactRequest
                 case ServiceEventType.contactRequestReceived:
                     type = GeneratedMessageType.receivedContactRequest
+                case ServiceEventType.contactRequestDiscarded:
+                    self.removeConversation(accountId: account.id,
+                                            accountRingId: ringId,
+                                            contactRingId: contactRingId,
+                                            shouldUpdateConversation: shouldUpdateConversations)
+                    return
                 default:
                     return
                 }
@@ -99,4 +105,20 @@ class ContactRequestManager {
             })
             .disposed(by: disposeBag)
     }
+
+    private func removeConversation(accountId: String, accountRingId: String,
+                                    contactRingId: String,
+                                    shouldUpdateConversation: Bool) {
+
+        guard let conversation = self.conversationService.findConversation(withRingId: contactRingId, withAccountId: accountId) else {
+            return
+        }
+        // remove conversation if it contain only generated messages
+        let messagesNotGenerated = conversation.messages.filter({!$0.isGenerated})
+
+        if !messagesNotGenerated.isEmpty {
+            return
+        }
+        self.conversationService.deleteConversation(conversation: conversation)
+    }
 }

Ring/Ring/Services/ContactsService.swift

@@ -127,6 +127,10 @@ class ContactsService {
             self.removeContactRequest(withRingId: contactRequest.ringId)
 
             if success {
+                var event = ServiceEvent(withEventType: .contactRequestDiscarded)
+                event.addEventInput(.accountId, value: account.id)
+                event.addEventInput(.uri, value: contactRequest.ringId)
+                self.responseStream.onNext(event)
                 observable.on(.completed)
             } else {
                 observable.on(.error(ContactServiceError.diacardTrusRequestFailed))

Ring/Ring/Services/ServiceEvent.swift

@@ -35,6 +35,7 @@ enum ServiceEventType {
     case contactAdded
     case contactRequestSended
     case contactRequestReceived
+    case contactRequestDiscarded
 }
 
 /**