Restore translated note rendering

Changelog-Fixed: Fixed broken automatic translations
Closes: https://github.com/damus-io/damus/issues/3406
Signed-off-by: alltheseas <64376233+alltheseas@users.noreply.github.com>

damus/Features/Events/NoteContentView.swift

@@ -307,7 +307,7 @@ struct NoteContentView: View {
         }
         
         // always reload artifacts on load
-        let plan = get_preload_plan(evcache: damus_state.events, ev: event, our_keypair: damus_state.keypair, settings: damus_state.settings)
+        let plan = get_preload_plan(ndb: damus_state.ndb, evcache: damus_state.events, ev: event, our_keypair: damus_state.keypair, settings: damus_state.settings)
         
         // TODO: make this cleaner
         Task {

damus/Features/Translations/Views/TranslateView.swift

@@ -158,15 +158,15 @@ func translate_note(profiles: Profiles, keypair: Keypair, event: NostrEvent, set
         return .not_needed
     }
 
-    // Render translated note
+    // Render translated note using the same NostrDB block parser so links/mentions/media stay consistent.
-    // TODO: fix translated blocks
+    let artifacts: NoteArtifactsSeparated
-    //let translated_blocks = parse_note_content(content: .content(translated_note, event.tags))
+    if let translated_blocks = try? NdbBlockGroup.parse(content: translated_note) {
-    //let artifacts = render_blocks(blocks: translated_blocks, profiles: profiles, can_hide_last_previewable_refs: true)
+        artifacts = render_blocks(blocks: translated_blocks, profiles: profiles, can_hide_last_previewable_refs: true)
+    } else {
+        artifacts = .just_content(translated_note)
+    }
     
-    return .not_needed
+    return .translated(Translated(artifacts: artifacts, language: note_lang))
-
-    // and cache it
-    //return .translated(Translated(artifacts: artifacts, language: note_lang))
 }
 
 func current_language() -> String {

damus/Shared/Utilities/EventCache.swift

@@ -280,6 +280,11 @@ func can_and_should_translate(event: NostrEvent, our_keypair: Keypair, settings:
 }
 
 func should_preload_translation(event: NostrEvent, our_keypair: Keypair, current_status: TranslateStatus, settings: UserSettingsStore, note_lang: String?) -> Bool {
+    guard let note_lang else {
+        // Without a detected language we can't safely auto-translate.
+        return false
+    }
+
     switch current_status {
     case .havent_tried:
         return can_and_should_translate(event: event, our_keypair: our_keypair, settings: settings, note_lang: note_lang) && settings.auto_translate
@@ -306,7 +311,13 @@ func load_preview(artifacts: NoteArtifactsSeparated) async -> Preview? {
     return Preview(meta: meta)
 }
 
-func get_preload_plan(evcache: EventCache, ev: NostrEvent, our_keypair: Keypair, settings: UserSettingsStore) -> PreloadPlan? {
+@MainActor
+private func compute_note_language(ndb: Ndb, ev: NostrEvent, keypair: Keypair) -> String? {
+    return ev.note_language(ndb: ndb, keypair)
+}
+
+@MainActor
+func get_preload_plan(ndb: Ndb, evcache: EventCache, ev: NostrEvent, our_keypair: Keypair, settings: UserSettingsStore) -> PreloadPlan? {
     let cache = evcache.get_cache_data(ev.id)
     let load_artifacts = cache.artifacts.should_preload
     if load_artifacts {
@@ -314,7 +325,10 @@ func get_preload_plan(evcache: EventCache, ev: NostrEvent, our_keypair: Keypair,
     }
 
     // Cached event might not have the note language determined yet, so determine the language here before figuring out if translations should be preloaded.
-    let note_lang = cache.translations_model.note_language ?? /*ev.note_language(our_keypair.privkey)*/ current_language()
+    let note_lang = cache.translations_model.note_language ?? compute_note_language(ndb: ndb, ev: ev, keypair: our_keypair)
+    if cache.translations_model.note_language == nil {
+        cache.translations_model.note_language = note_lang
+    }
 
     let load_translations = should_preload_translation(event: ev, our_keypair: our_keypair, current_status: cache.translations, settings: settings, note_lang: note_lang)
     if load_translations {
@@ -418,11 +432,19 @@ func preload_event(plan: PreloadPlan, state: DamusState) async {
         }
     }
     
-    let note_language = plan.data.translations_model.note_language ?? plan.event.note_language(ndb: state.ndb, our_keypair) ?? current_language()
+    let note_language: String?
+    if let cached_language = plan.data.translations_model.note_language {
+        note_language = cached_language
+    } else {
+        note_language = await compute_note_language(ndb: state.ndb, ev: plan.event, keypair: our_keypair)
+    }
 
     var translations: TranslateStatus? = nil
     // We have to recheck should_translate here now that we have note_language
-    if plan.load_translations && can_and_should_translate(event: plan.event, our_keypair: our_keypair, settings: settings, note_lang: note_language) && settings.auto_translate
+    if plan.load_translations,
+       let note_language,
+       can_and_should_translate(event: plan.event, our_keypair: our_keypair, settings: settings, note_lang: note_language),
+       settings.auto_translate
     {
         translations = await translate_note(profiles: profiles, keypair: our_keypair, event: plan.event, settings: settings, note_lang: note_language, purple: state.purple)
     }
@@ -446,18 +468,29 @@ func preload_events(state: DamusState, events: [NostrEvent]) {
     let our_keypair = state.keypair
     let settings = state.settings
     
-    let plans = events.compactMap { ev in
-        get_preload_plan(evcache: event_cache, ev: ev, our_keypair: our_keypair, settings: settings)
-    }
-    
-    if plans.count == 0 {
-        return
-    }
-    
     Task {
+        let plans = await withTaskGroup(of: PreloadPlan?.self) { group in
+            for ev in events {
+                group.addTask {
+                    await get_preload_plan(ndb: state.ndb, evcache: event_cache, ev: ev, our_keypair: our_keypair, settings: settings)
+                }
+            }
+            
+            var results: [PreloadPlan] = []
+            for await plan in group {
+                if let plan {
+                    results.append(plan)
+                }
+            }
+            return results
+        }
+        
+        if plans.count == 0 {
+            return
+        }
+        
         for plan in plans {
             await preload_event(plan: plan, state: state)
         }
     }
 }
-

nostrdb/NdbNote.swift

@@ -556,8 +556,8 @@ extension NdbNote {
         return thread_reply() != nil
     }
 
+    @MainActor
     func note_language(ndb: Ndb, _ keypair: Keypair) -> String? {
-        assert(!Thread.isMainThread, "This function must not be run on the main thread.")
 
         // Rely on Apple's NLLanguageRecognizer to tell us which language it thinks the note is in
         // and filter on only the text portions of the content as URLs and hashtags confuse the language recognizer.