fix: add confidence calculation for BruteForceParser (#5903)

Co-authored-by: Michael Genson <71845777+michael-genson@users.noreply.github.com>

mealie/services/parser_services/ingredient_parser.py

@@ -12,6 +12,8 @@ from mealie.schema.recipe.recipe_ingredient import (
     CreateIngredientFood,
     CreateIngredientUnit,
     IngredientConfidence,
+    IngredientFood,
+    IngredientUnit,
     ParsedIngredient,
     RegisteredParser,
 )
@@ -28,11 +30,11 @@ class BruteForceParser(ABCIngredientParser):
     Brute force ingredient parser.
     """
 
-    async def parse_one(self, ingredient: str) -> ParsedIngredient:
-        bfi = brute.parse(ingredient, self)
+    async def parse_one(self, ingredient_string: str) -> ParsedIngredient:
+        bfi = brute.parse(ingredient_string, self)
 
         parsed_ingredient = ParsedIngredient(
-            input=ingredient,
+            input=ingredient_string,
             ingredient=RecipeIngredient(
                 unit=CreateIngredientUnit(name=bfi.unit),
                 food=CreateIngredientFood(name=bfi.food),
@@ -41,7 +43,28 @@ class BruteForceParser(ABCIngredientParser):
             ),
         )
 
-        return self.find_ingredient_match(parsed_ingredient)
+        matched_ingredient = self.find_ingredient_match(parsed_ingredient)
+
+        qty_conf = 1
+        note_conf = 1
+
+        unit_obj = matched_ingredient.ingredient.unit
+        food_obj = matched_ingredient.ingredient.food
+
+        unit_conf = 1 if bfi.unit is None or isinstance(unit_obj, IngredientUnit) else 0
+        food_conf = 1 if bfi.food is None or isinstance(food_obj, IngredientFood) else 0
+
+        avg_conf = (qty_conf + unit_conf + food_conf + note_conf) / 4
+
+        matched_ingredient.confidence = IngredientConfidence(
+            average=avg_conf,
+            quantity=qty_conf,
+            unit=unit_conf,
+            food=food_conf,
+            comment=note_conf,
+        )
+
+        return matched_ingredient
 
     async def parse(self, ingredients: list[str]) -> list[ParsedIngredient]:
         return [await self.parse_one(ingredient) for ingredient in ingredients]

tests/unit_tests/test_ingredient_parser.py

@@ -226,6 +226,46 @@ def test_brute_parser(
             assert not comment
 
 
+@pytest.mark.parametrize(
+    "unit, food, expect_unit_match, expect_food_match, expected_avg",
+    [
+        pytest.param("Cups", "potatoes", True, True, 1.0, id="all matched"),
+        pytest.param("Cups", "veryuniquefood", True, False, 0.75, id="unit matched only"),
+        pytest.param("veryuniqueunit", "potatoes", False, True, 0.75, id="food matched only"),
+        pytest.param("veryuniqueunit", "veryuniquefood", False, False, 0.5, id="neither matched"),
+    ],
+)
+def test_brute_parser_confidence(
+    unit: str,
+    food: str,
+    expect_unit_match: bool,
+    expect_food_match: bool,
+    expected_avg: float,
+    unique_local_group_id: UUID4,
+    parsed_ingredient_data: tuple[list[IngredientFood], list[IngredientUnit]],
+):
+    input_str = f"1 {unit} {food}"
+
+    with session_context() as session:
+        original_loop = asyncio.get_event_loop()
+        try:
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+            parser = get_parser(RegisteredParser.brute, unique_local_group_id, session)
+            parsed = loop.run_until_complete(parser.parse_one(input_str))
+        finally:
+            loop.close()
+            asyncio.set_event_loop(original_loop)
+
+        conf = parsed.confidence
+
+        assert conf.quantity == 1
+        assert conf.comment == 1
+        assert conf.unit == (1 if expect_unit_match or not unit else 0)
+        assert conf.food == (1 if expect_food_match or not food else 0)
+        assert conf.average == expected_avg
+
+
 @pytest.mark.parametrize(
     "input, expected_unit_name, expected_food_name, expect_unit_match, expect_food_match",
     (