feat: openfoodfacts#596 - implemented autocomplete for ORIGINS

Impacted files:
* `api_get_autocompleted_suggestions_test.dart`: added tests for ORIGINS autocomplete
* `api_getProduct_test.dart`: minor refactoring
* `openfoodfacts.dart`: minor refactoring
* `TagType.dart`: added ORIGINS; refactored "à la 2.17"
* `TaxonomyQueryConfiguration.dart`: minor refactoring

lib/openfoodfacts.dart

@@ -274,7 +274,7 @@ class OpenFoodAPIClient {
       throw Exception('No taxonomy translation for $taxonomyTagType');
     }
     final Uri uri = UriHelper.getUri(
-      path: taxonomyTagType.key,
+      path: taxonomyTagType.offTag,
       queryType: queryType,
       queryParameters: {'translate': '1'},
       addUserAgentParameters: false,
@@ -773,7 +773,7 @@ class OpenFoodAPIClient {
       queryType: queryType,
     );
     final Map<String, String> queryParameters = <String, String>{
-      'tagtype': taxonomyType.key,
+      'tagtype': taxonomyType.offTag,
       'term': input,
       'lc': language.code,
       'limit': limit.toString(),

lib/utils/TagType.dart

@@ -1,30 +1,31 @@
-enum TagType {
-  STATES,
-  LANGUAGES,
-  LABELS,
-  CATEGORIES,
-  COUNTRIES,
-  INGREDIENTS,
-  TRACES,
-  ADDITIVES,
-  ALLERGENS,
-  PACKAGING,
-  EMB_CODES
-}
+import 'package:openfoodfacts/model/OffTagged.dart';
+
+enum TagType implements OffTagged {
+  STATES(offTag: 'states'),
+  LANGUAGES(offTag: 'languages'),
+  LABELS(offTag: 'labels'),
+  CATEGORIES(offTag: 'categories'),
+  COUNTRIES(offTag: 'countries'),
+  INGREDIENTS(offTag: 'ingredients'),
+  TRACES(offTag: 'traces'),
+  ADDITIVES(offTag: 'additives'),
+  ALLERGENS(offTag: 'allergens'),
+  PACKAGING(offTag: 'packaging'),
+  ORIGINS(offTag: 'origins'),
+  EMB_CODES(offTag: 'emb_codes');
+
+  const TagType({
+    required this.offTag,
+  });
+
+  @override
+  final String offTag;
+
+  /// Returns the first [TagType] that matches the [offTag].
+  static TagType? fromOffTag(final String? offTag) =>
+      OffTagged.fromOffTag(offTag, TagType.values) as TagType?;
 
-extension TaxonomyTypeExtension on TagType {
-  static const Map<TagType, String> _TAXONOMIES = {
-    TagType.STATES: 'states',
-    TagType.LABELS: 'labels',
-    TagType.CATEGORIES: 'categories',
-    TagType.COUNTRIES: 'countries',
-    TagType.INGREDIENTS: 'ingredients',
-    TagType.TRACES: 'traces',
-    TagType.ADDITIVES: 'additives',
-    TagType.ALLERGENS: 'allergens',
-    TagType.PACKAGING: 'packaging',
-    TagType.LANGUAGES: 'languages',
-    TagType.EMB_CODES: 'emb_codes',
-  };
-  String get key => _TAXONOMIES[this] ?? '';
+  // TODO: deprecated from 2022-10-23; remove when old enough
+  @Deprecated('Use offTag instead')
+  String get key => offTag;
 }

lib/utils/TaxonomyQueryConfiguration.dart

@@ -94,7 +94,7 @@ abstract class TaxonomyQueryConfiguration<T extends JsonObject,
   Map<String, String> getParametersMap() {
     final Map<String, String> result = {};
 
-    result['tagtype'] = tagType.key;
+    result['tagtype'] = tagType.offTag;
     if (_isRootConfiguration) {
       result['include_root_entries'] = '1';
     } else {

test/api_getProduct_test.dart

@@ -1799,7 +1799,7 @@ void main() {
           expect(
             url,
             'https://world-${language.code}.openfoodfacts.net/'
-            '${tagType.key}'
+            '${tagType.offTag}'
             '?translate=1',
           );
         } catch (e) {

test/api_get_autocompleted_suggestions_test.dart

@@ -15,59 +15,97 @@ void main() {
   }
 
   group('$OpenFoodAPIClient Suggestions and autocompletion', () {
-    test('Suggestions for countries', () async {
-      List<dynamic> result =
-          await OpenFoodAPIClient.getAutocompletedSuggestions(
+    test('Suggestions for countries and origins', () async {
+      late List<dynamic> result;
+
+      final List<TagType> tagTypes = <TagType>[
         TagType.COUNTRIES,
-        language: OpenFoodFactsLanguage.FRENCH,
-        input: 't',
-      );
+        TagType.ORIGINS,
+      ];
+      for (final TagType tagType in tagTypes) {
+        result = await OpenFoodAPIClient.getAutocompletedSuggestions(
+          tagType,
+          language: OpenFoodFactsLanguage.FRENCH,
+          input: 't',
+        );
+        listContains(result, 't');
+
+        result = await OpenFoodAPIClient.getAutocompletedSuggestions(
+          tagType,
+          language: OpenFoodFactsLanguage.FRENCH,
+          input: 'TUN',
+        );
+        listContains(result, 'tun');
+
+        result = await OpenFoodAPIClient.getAutocompletedSuggestions(
+          tagType,
+          language: OpenFoodFactsLanguage.ENGLISH,
+          input: 'TUN',
+        );
+        listContains(result, 'tun');
+
+        result = await OpenFoodAPIClient.getAutocompletedSuggestions(
+          tagType,
+          language: OpenFoodFactsLanguage.ARABIC,
+          input: 'تو',
+        );
+        listContains(result, 'تو');
+
+        result = await OpenFoodAPIClient.getAutocompletedSuggestions(
+          tagType,
+          language: OpenFoodFactsLanguage.GEORGIAN,
+          input: 'TUN',
+        );
+        expect(result, isEmpty);
+
+        expect(
+            await OpenFoodAPIClient.getAutocompletedSuggestions(
+              tagType,
+              language: OpenFoodFactsLanguage.FRENCH,
+              input: 'TUN',
+            ),
+            await OpenFoodAPIClient.getAutocompletedSuggestions(
+              tagType,
+              language: OpenFoodFactsLanguage.FRENCH,
+              input: 'tun',
+            ));
+      }
+    });
 
-      listContains(result, 't');
+    test('Suggestions for countries only', () async {
+      late List<dynamic> result;
 
       result = await OpenFoodAPIClient.getAutocompletedSuggestions(
         TagType.COUNTRIES,
         language: OpenFoodFactsLanguage.FRENCH,
-        input: 'TUN',
+        input: 'provence',
       );
+      expect(result, isEmpty); // "provence" is not a country
+    });
 
-      listContains(result, 'tun');
+    test('Suggestions for origins only', () async {
+      late List<dynamic> result;
 
       result = await OpenFoodAPIClient.getAutocompletedSuggestions(
-        TagType.COUNTRIES,
-        language: OpenFoodFactsLanguage.ENGLISH,
-        input: 'TUN',
+        TagType.ORIGINS,
+        language: OpenFoodFactsLanguage.FRENCH,
+        input: 'provence',
       );
-
-      listContains(result, 'tun');
+      expect(result, isNotEmpty);
 
       result = await OpenFoodAPIClient.getAutocompletedSuggestions(
-        TagType.COUNTRIES,
-        language: OpenFoodFactsLanguage.ARABIC,
-        input: 'تو',
+        TagType.ORIGINS,
+        language: OpenFoodFactsLanguage.FRENCH,
+        input: 'prove',
       );
-
-      listContains(result, 'تو');
+      expect(result, isNotEmpty);
 
       result = await OpenFoodAPIClient.getAutocompletedSuggestions(
-        TagType.COUNTRIES,
-        language: OpenFoodFactsLanguage.GEORGIAN,
-        input: 'TUN',
+        TagType.ORIGINS,
+        language: OpenFoodFactsLanguage.FRENCH,
+        input: 'pyré',
       );
-
-      expect(result.isEmpty, true);
-
-      expect(
-          await OpenFoodAPIClient.getAutocompletedSuggestions(
-            TagType.COUNTRIES,
-            language: OpenFoodFactsLanguage.FRENCH,
-            input: 'TUN',
-          ),
-          await OpenFoodAPIClient.getAutocompletedSuggestions(
-            TagType.COUNTRIES,
-            language: OpenFoodFactsLanguage.FRENCH,
-            input: 'tun',
-          ));
+      expect(result, isNotEmpty); // something about Pyrénées
     });
 
     test('Suggestions for state', () async {