Use commonAncestor from offline model

Closes MOB-373

Change the schema of offline predictions to include results array and seaprate commonAncestor, matching vision api responses.

Configure offline image predictions to set common ancestor mode.

src/sharedHelpers/mlModel.ts

@@ -3,7 +3,11 @@ import { Alert, Platform } from "react-native";
 import Config from "react-native-config";
 import RNFS from "react-native-fs";
 import type { Location } from "vision-camera-plugin-inatvision";
-import { getPredictionsForImage, getPredictionsForLocation } from "vision-camera-plugin-inatvision";
+import {
+  getPredictionsForImage,
+  getPredictionsForLocation,
+  MODE
+} from "vision-camera-plugin-inatvision";
 
 const modelFiles = {
   // The iOS model and taxonomy files always have to be referenced in the
@@ -62,7 +66,8 @@ export const predictImage = ( uri: string, location: Location ) => {
     geomodelPath,
     location: hasLocation
       ? location
-      : undefined
+      : undefined,
+    mode: MODE.COMMON_ANCESTOR
   } );
 };
 

src/sharedHooks/useSuggestions/useOfflineSuggestions.ts

@@ -30,10 +30,16 @@ const useOfflineSuggestions = (
     tryOfflineSuggestions: boolean
   }
 ): {
-  offlineSuggestions: OfflineSuggestion[];
+  offlineSuggestions: {
+    results: OfflineSuggestion[],
+    commonAncestor: OfflineSuggestion | undefined
+  };
 } => {
   const realm = useRealm( );
-  const [offlineSuggestions, setOfflineSuggestions] = useState<OfflineSuggestion[]>( [] );
+  const [offlineSuggestions, setOfflineSuggestions] = useState<{
+    results: OfflineSuggestion[],
+    commonAncestor: OfflineSuggestion | undefined
+  }>( { results: [], commonAncestor: undefined } );
   const [error, setError] = useState( null );
 
   const {
@@ -43,10 +49,14 @@ const useOfflineSuggestions = (
   useEffect( ( ) => {
     const predictOffline = async ( ) => {
       let rawPredictions = [];
+      let commonAncestor;
       try {
         const location = { latitude, longitude };
         const result = await predictImage( photoUri, location );
         rawPredictions = result.predictions;
+        // Destructuring here leads to different errors from the linter.
+        // eslint-disable-next-line prefer-destructuring
+        commonAncestor = result.commonAncestor;
       } catch ( predictImageError ) {
         onFetchError( { isOnline: false } );
         logger.error( "Error predicting image offline", predictImageError );
@@ -56,27 +66,44 @@ const useOfflineSuggestions = (
       // but we're offline so we only need the local list from realm
       // and don't need to fetch taxon from the API
       const iconicTaxa = realm?.objects( "Taxon" ).filtered( "isIconic = true" );
-      const branchIDs = rawPredictions.map( t => t.taxon_id );
+      const branchIDs = [...rawPredictions.map( t => t.taxon_id ), ...( commonAncestor
+        ? [commonAncestor.taxon_id]
+        : [] )];
       const iconicTaxonName = iconicTaxa?.find( t => branchIDs.indexOf( t.id ) >= 0 )?.name;
 
+      // This function handles either regular or common ancestor predictions as input objects. I'm
+      // not going to define an interface for them in the middle of refactoring and changing logic.
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const formatPrediction = ( prediction: any ): OfflineSuggestion => ( {
+        combined_score: prediction.combined_score,
+        taxon: {
+          id: Number( prediction.taxon_id ),
+          name: prediction.name,
+          rank_level: prediction.rank_level,
+          iconic_taxon_name: iconicTaxonName
+        }
+      } );
+
       // using the same rank level for displaying predictions in AI Camera
       // this is all temporary, since we ultimately want predictions
       // returned similarly to how we return them on web; this is returning a
       // single branch like on the AI Camera 2023-12-08
       const formattedPredictions = rawPredictions?.reverse( )
         .filter( prediction => prediction.rank_level <= 40 )
-        .map( prediction => ( {
-          combined_score: prediction.combined_score,
-          taxon: {
-            id: Number( prediction.taxon_id ),
-            name: prediction.name,
-            rank_level: prediction.rank_level,
-            iconic_taxon_name: iconicTaxonName
-          }
-        } ) );
-      setOfflineSuggestions( formattedPredictions );
+        .map( prediction => formatPrediction( prediction ) );
+
+      const commonAncestorSuggestion = commonAncestor
+        ? formatPrediction( commonAncestor )
+        : undefined;
+
+      const returnValue = {
+        results: formattedPredictions,
+        commonAncestor: commonAncestorSuggestion
+      };
+
+      setOfflineSuggestions( returnValue );
       onFetched( { isOnline: false } );
-      return formattedPredictions;
+      return returnValue;
     };
 
     if ( photoUri && tryOfflineSuggestions ) {

src/sharedHooks/useSuggestions/useSuggestions.js

@@ -63,27 +63,34 @@ export const useSuggestions = ( photoUri, options ) => {
   } );
 
   const usingOfflineSuggestions = tryOfflineSuggestions || (
-    offlineSuggestions.length > 0
+    offlineSuggestions?.results?.length > 0
       && ( !onlineSuggestions || onlineSuggestions?.results?.length === 0 )
   );
 
   const hasOnlineSuggestionResults = onlineSuggestions?.results?.length > 0;
 
-  const unfilteredSuggestions = hasOnlineSuggestionResults
-    ? onlineSuggestions.results
-    : offlineSuggestions;
+  const unfilteredSuggestions = useMemo(
+    ( ) => ( hasOnlineSuggestionResults
+      ? onlineSuggestions.results || []
+      : offlineSuggestions.results || [] ),
+    [hasOnlineSuggestionResults, onlineSuggestions, offlineSuggestions]
+  );
+
+  const commonAncestor = hasOnlineSuggestionResults
+    ? onlineSuggestions?.commonAncestor
+    : offlineSuggestions?.commonAncestor;
 
   // since we can calculate this, there's no need to store it in state
   const suggestions = useMemo(
     ( ) => filterSuggestions(
       unfilteredSuggestions,
       usingOfflineSuggestions,
-      onlineSuggestions?.common_ancestor
+      commonAncestor
     ),
     [
       unfilteredSuggestions,
       usingOfflineSuggestions,
-      onlineSuggestions?.common_ancestor
+      commonAncestor
     ]
   );