Conversation unread state

Localizations/Localizable.strings

@@ -107,6 +107,7 @@
 "compose.visibility-button.accessibility-label-%@" = "Privacy: %@";
 "compose-button.accessibility-label.post" = "Compose Post";
 "compose-button.accessibility-label.toot" = "Compose Toot";
+"conversation.unread" = "Unread";
 "emoji.custom" = "Custom";
 "emoji.default-skin-tone" = "Default skin tone";
 "emoji.default-skin-tone-button.accessibility-label" = "Select default skin tone";

MastodonAPI/Sources/MastodonAPI/Endpoints/ConversationEndpoint.swift

@@ -0,0 +1,31 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import HTTP
+import Mastodon
+
+public enum ConversationEndpoint {
+    case read(id: Conversation.Id)
+}
+
+extension ConversationEndpoint: Endpoint {
+    public typealias ResultType = Conversation
+
+    public var context: [String] {
+        defaultContext + ["conversations"]
+    }
+
+    public var pathComponentsInContext: [String] {
+        switch self {
+        case let .read(id):
+            return [id, "read"]
+        }
+    }
+
+    public var method: HTTPMethod {
+        switch self {
+        case .read:
+            return .post
+        }
+    }
+}

ServiceLayer/Sources/ServiceLayer/Services/ConversationsService.swift

@@ -26,6 +26,14 @@ public struct ConversationsService {
     }
 }
 
+public extension ConversationsService {
+    func markConversationAsRead(id: Conversation.Id) -> AnyPublisher<Never, Error> {
+        mastodonAPIClient.request(ConversationEndpoint.read(id: id))
+            .flatMap { contentDatabase.insert(conversations: [$0]) }
+            .eraseToAnyPublisher()
+    }
+}
+
 extension ConversationsService: CollectionService {
     public func request(maxId: String?, minId: String?, search: Search?) -> AnyPublisher<Never, Error> {
         mastodonAPIClient.pagedRequest(ConversationsEndpoint.conversations, maxId: maxId, minId: minId)

ViewModels/Sources/ViewModels/View Models/CollectionItemsViewModel.swift

@@ -149,6 +149,10 @@ extension CollectionItemsViewModel: CollectionViewModel {
         case let .conversation(conversation):
             guard let status = conversation.lastStatus else { break }
 
+            (collectionService as? ConversationsService)?.markConversationAsRead(id: conversation.id)
+                .sink { _ in } receiveValue: { _ in }
+                .store(in: &cancellables)
+
             send(event: .navigation(.collection(collectionService
                                                     .navigationService
                                                     .contextService(id: status.displayStatus.id))))

ViewModels/Sources/ViewModels/View Models/ConversationViewModel.swift

@@ -33,3 +33,7 @@ public final class ConversationViewModel: ObservableObject {
         self.identityContext = identityContext
     }
 }
+
+public extension ConversationViewModel {
+    var isUnread: Bool { conversationService.conversation.unread }
+}

Views/UIKit/Content Views/ConversationView.swift

@@ -7,6 +7,9 @@ import ViewModels
 final class ConversationView: UIView {
     let avatarsView = ConversationAvatarsView()
     let displayNamesLabel = UILabel()
+    let unreadIndicator = UIImageView(image: UIImage(
+                                        systemName: "circlebadge.fill",
+                                        withConfiguration: UIImage.SymbolConfiguration(scale: .small)))
     let timeLabel = UILabel()
     let statusBodyView = StatusBodyView()
 
@@ -78,6 +81,7 @@ private extension ConversationView {
         namesTimeStackView.spacing = .compactSpacing
         namesTimeStackView.alignment = .top
         namesTimeStackView.addArrangedSubview(displayNamesLabel)
+        namesTimeStackView.addArrangedSubview(unreadIndicator)
         namesTimeStackView.addArrangedSubview(timeLabel)
 
         mainStackView.axis = .vertical
@@ -90,6 +94,9 @@ private extension ConversationView {
         displayNamesLabel.adjustsFontForContentSizeCategory = true
         displayNamesLabel.numberOfLines = 0
 
+        unreadIndicator.contentMode = .scaleAspectFit
+        unreadIndicator.setContentHuggingPriority(.required, for: .horizontal)
+
         timeLabel.font = .preferredFont(forTextStyle: .subheadline)
         timeLabel.adjustsFontForContentSizeCategory = true
         timeLabel.textColor = .secondaryLabel
@@ -126,6 +133,7 @@ private extension ConversationView {
             view: displayNamesLabel)
         mutableDisplayNames.resizeAttachments(toLineHeight: displayNamesLabel.font.lineHeight)
 
+        unreadIndicator.isHidden = !viewModel.isUnread
         displayNamesLabel.attributedText = mutableDisplayNames
         timeLabel.text = viewModel.statusViewModel?.time
         timeLabel.accessibilityLabel = viewModel.statusViewModel?.accessibilityTime
@@ -134,6 +142,10 @@ private extension ConversationView {
 
         let accessibilityAttributedLabel = NSMutableAttributedString(attributedString: mutableDisplayNames)
 
+        if viewModel.isUnread {
+            accessibilityAttributedLabel.appendWithSeparator(NSLocalizedString("conversation.unread", comment: ""))
+        }
+
         if let statusBodyAccessibilityAttributedLabel = statusBodyView.accessibilityAttributedLabel {
             accessibilityAttributedLabel.appendWithSeparator(statusBodyAccessibilityAttributedLabel)
         }