From b63f663947462f398f8d78554f50709faad2b8c5 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sat, 11 Feb 2023 18:10:29 -0500
Subject: [PATCH] Handle errors when loading trending links

---
 .../Explore/TrendingLinksViewController.swift | 46 ++++++++++++-------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/Tusker/Screens/Explore/TrendingLinksViewController.swift b/Tusker/Screens/Explore/TrendingLinksViewController.swift
index 85df6798..a622eb33 100644
--- a/Tusker/Screens/Explore/TrendingLinksViewController.swift
+++ b/Tusker/Screens/Explore/TrendingLinksViewController.swift
@@ -126,16 +126,23 @@ class TrendingLinksViewController: UIViewController, CollectionViewController {
         snapshot.appendItems([.loadingIndicator])
         await dataSource.apply(snapshot)
         
-        let request = Client.getTrendingLinks()
-        guard let (links, _) = try? await mastodonController.run(request) else {
-            return
+        do {
+            let request = Client.getTrendingLinks()
+            let (links, _) = try await mastodonController.run(request)
+            snapshot.deleteSections([.loadingIndicator])
+            snapshot.appendSections([.links])
+            snapshot.appendItems(links.map { .link($0) })
+            await dataSource.apply(snapshot)
+            state = .loaded
+        } catch {
+            await dataSource.apply(NSDiffableDataSourceSnapshot())
+            state = .unloaded
+            let config = ToastConfiguration(from: error, with: "Error Loading Trending Links", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadInitial()
+            }
+            self.showToast(configuration: config, animated: true)
         }
-        snapshot.deleteSections([.loadingIndicator])
-        snapshot.appendSections([.links])
-        snapshot.appendItems(links.map { .link($0) })
-        await dataSource.apply(snapshot)
-        
-        state = .loaded
     }
     
     @MainActor
@@ -165,15 +172,20 @@ class TrendingLinksViewController: UIViewController, CollectionViewController {
             await dataSource.apply(snapshot)
         }
         
-        let request = Client.getTrendingLinks(offset: snapshot.itemIdentifiers.count)
-        guard let (links, _) = try? await mastodonController.run(request) else {
-            return
+        do {
+            let request = Client.getTrendingLinks(offset: origSnapshot.itemIdentifiers.count)
+            let (links, _) = try await mastodonController.run(request)
+            snapshot = origSnapshot
+            snapshot.appendItems(links.map { .link($0) }, toSection: .links)
+            await dataSource.apply(snapshot)
+        } catch {
+            await dataSource.apply(origSnapshot)
+            let config = ToastConfiguration(from: error, with: "Erorr Loading Older Links", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadOlder()
+            }
+            self.showToast(configuration: config, animated: true)
         }
-        snapshot = origSnapshot
-        snapshot.appendItems(links.map { .link($0) }, toSection: .links)
-        await dataSource.apply(snapshot)
-        
-        state = .loaded
     }
     
 }