From 3cba0bce348e54b8be281275eb9427c8eda8b031 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sat, 24 Dec 2022 12:20:13 -0500
Subject: [PATCH] Update pinned timelines when changed remotely

---
 .../MastodonCachePersistentStore.swift         | 18 +++++++++++++-----
 .../Timeline/TimelinesPageViewController.swift | 17 +++++++++++------
 2 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/Tusker/CoreData/MastodonCachePersistentStore.swift b/Tusker/CoreData/MastodonCachePersistentStore.swift
index 25f62436..93c8deb1 100644
--- a/Tusker/CoreData/MastodonCachePersistentStore.swift
+++ b/Tusker/CoreData/MastodonCachePersistentStore.swift
@@ -507,24 +507,28 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
             self.backgroundContext.performAndWait {
                 if let result = try? self.backgroundContext.execute(req) as? NSPersistentHistoryResult,
                    let transactions = result.result as? [NSPersistentHistoryTransaction] {
-                    var changes: (hashtags: Bool, instances: Bool) = (false, false)
+                    var changedHashtags = false
+                    var changedInstances = false
                     var changedTimelinePositions: [NSManagedObjectID] = []
+                    var changedAccountPrefs = false
                     outer: for transaction in transactions {
                         for change in transaction.changes ?? [] {
                             if change.changedObjectID.entity.name == "SavedHashtag" {
-                                changes.hashtags = true
+                                changedHashtags = true
                             } else if change.changedObjectID.entity.name == "SavedInstance" {
-                                changes.instances = true
+                                changedInstances = true
                             } else if change.changedObjectID.entity.name == "TimelinePosition" {
                                 changedTimelinePositions.append(change.changedObjectID)
+                            } else if change.changedObjectID.entity.name == "AccountPreferences" {
+                                changedAccountPrefs = true
                             }
                         }
                     }
                     DispatchQueue.main.async {
-                        if changes.hashtags {
+                        if changedHashtags {
                             NotificationCenter.default.post(name: .savedHashtagsChanged, object: nil)
                         }
-                        if changes.instances {
+                        if changedInstances {
                             NotificationCenter.default.post(name: .savedInstancesChanged, object: nil)
                         }
                         for id in changedTimelinePositions {
@@ -533,6 +537,9 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
                             }
                             NotificationCenter.default.post(name: .timelinePositionChanged, object: timelinePosition)
                         }
+                        if changedAccountPrefs {
+                            NotificationCenter.default.post(name: .accountPreferencesChangedRemotely, object: nil)
+                        }
                     }
                 }
             }
@@ -543,4 +550,5 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
 
 extension Foundation.Notification.Name {
     static let timelinePositionChanged = Notification.Name("timelinePositionChanged")
+    static let accountPreferencesChangedRemotely = Notification.Name("accountPreferencesChangedRemotely")
 }
diff --git a/Tusker/Screens/Timeline/TimelinesPageViewController.swift b/Tusker/Screens/Timeline/TimelinesPageViewController.swift
index cf64b7f9..129b5057 100644
--- a/Tusker/Screens/Timeline/TimelinesPageViewController.swift
+++ b/Tusker/Screens/Timeline/TimelinesPageViewController.swift
@@ -9,6 +9,7 @@
 import UIKit
 import SwiftUI
 import Pachyderm
+import Combine
 
 class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageViewController.Page> {
 
@@ -18,7 +19,7 @@ class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageView
     
     weak var mastodonController: MastodonController!
     
-    private var pinnedTimelinesObservation: NSKeyValueObservation?
+    private var cancellables = Set<AnyCancellable>()
     
     init(mastodonController: MastodonController) {
         self.mastodonController = mastodonController
@@ -63,12 +64,16 @@ class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageView
             }),
         ]
         
-        pinnedTimelinesObservation = mastodonController.accountPreferences.observe(\.pinnedTimelinesData, changeHandler: { [unowned self] _, _ in
-            let pages = self.mastodonController.accountPreferences.pinnedTimelines.map {
-                Page(mastodonController: self.mastodonController, timeline: $0)
+        mastodonController.accountPreferences.publisher(for: \.pinnedTimelinesData)
+            .map { _ in () }
+            .merge(with: NotificationCenter.default.publisher(for: .accountPreferencesChangedRemotely).map { _ in () })
+            .sink { _ in
+                let pages = self.mastodonController.accountPreferences.pinnedTimelines.map {
+                    Page(mastodonController: self.mastodonController, timeline: $0)
+                }
+                self.setPages(pages, animated: false)
             }
-            self.setPages(pages, animated: false)
-        })
+            .store(in: &cancellables)
     }
     
     required init?(coder: NSCoder) {