"""Cases taken from failures verified against the live Mealie instance."""
from __future__ import annotations

import pytest

from mealie_mcp.normalize import (
    clean_title,
    find_english_leftovers,
    food_matches_line,
    has_extraction_failure,
    ingredient_display_lines,
    line_remainder,
    looks_mangled,
    match_unit,
    normalize_for_parser,
    same_line,
    slugify,
    unit_token,
)


class TestNormalizeForParser:
    def test_converts_swedish_decimal_comma(self):
        assert normalize_for_parser("4,7 dl basmatiris") == "4.7 dl basmatiris"

    def test_leaves_list_commas_alone(self):
        assert normalize_for_parser("salt, peppar") == "salt, peppar"

    def test_collapses_whitespace(self):
        assert normalize_for_parser("  2   msk   olja  ") == "2 msk olja"

    def test_is_idempotent(self):
        once = normalize_for_parser("0,6 dl grädde")
        assert normalize_for_parser(once) == once


class TestCleanTitle:
    @pytest.mark.parametrize(
        "raw,expected",
        [
            ("Fläskfilé med svampsås - se & gör", "Fläskfilé med svampsås"),
            ("Kycklinggryta | Köket.se", "Kycklinggryta"),
            ("Pannkakor - se och gör", "Pannkakor"),
            ("Lax i ugn", "Lax i ugn"),
        ],
    )
    def test_strips_campaign_suffixes(self, raw, expected):
        assert clean_title(raw) == expected

    def test_strips_stacked_suffixes(self):
        assert clean_title("Ugnslax - se & gör | Köket.se") == "Ugnslax"


class TestSlugify:
    def test_transliterates_swedish_characters(self):
        assert slugify("Kycklinggryta med äpple och lök") == "kycklinggryta-med-apple-och-lok"

    def test_expands_ampersand(self):
        assert slugify("Förrätter & tilltugg") == "forratter-och-tilltugg"


class TestFindEnglishLeftovers:
    def test_flags_untranslated_units(self):
        assert set(find_english_leftovers("2 cups flour, 1 tbsp butter")) == {"cups", "tbsp"}

    def test_clean_swedish_line_passes(self):
        assert find_english_leftovers("2 dl vetemjöl, 1 msk smör") == []

    def test_does_not_match_inside_swedish_words(self):
        # "klyfta" contains no English token; substring matching would be wrong here.
        assert find_english_leftovers("1 klyfta vitlök") == []


class TestLooksMangled:
    def test_flags_composed_fraction_from_parser(self):
        assert looks_mangled("47⁄10 liter basmatiris")

    def test_flags_duplicated_unit(self):
        assert looks_mangled("2 dl dl grädde")

    def test_clean_line_is_not_mangled(self):
        assert not looks_mangled("4,7 dl basmatiris")


class TestExtractionFailure:
    def test_detects_scraper_placeholder_in_ingredients(self):
        recipe = {"recipeIngredient": [{"display": "Could not detect ingredients"}]}
        assert has_extraction_failure(recipe)

    def test_clean_recipe_passes(self):
        recipe = {"recipeIngredient": [{"display": "2 dl grädde"}]}
        assert not has_extraction_failure(recipe)


class TestIngredientDisplayLines:
    def test_prefers_display_then_note_then_food(self):
        recipe = {
            "recipeIngredient": [
                {"display": "2 dl grädde", "note": "ignored"},
                {"display": "", "note": "1 gul lök"},
                {"display": "", "note": "", "food": {"name": "salt"}},
            ]
        }
        assert ingredient_display_lines(recipe) == ["2 dl grädde", "1 gul lök", "salt"]


class TestParserStructureSafety:
    def test_reads_the_written_unit_token(self):
        assert unit_token("4,7 dl basmatiris") == "dl"
        assert unit_token("1-1,5 msk fond") == "msk"
        assert unit_token("salt") is None

    def test_matches_instance_unit_by_abbreviation(self):
        gram = {"id": "g", "name": "gram", "abbreviation": "g"}
        assert match_unit("g", [gram]) == gram
        assert match_unit("dl", [gram]) is None

    def test_rejects_a_nearby_but_different_food(self):
        assert food_matches_line("kycklinglårfilé", "800 g kycklinglårfilé")
        assert not food_matches_line("kycklingfilé", "800 g kycklinglårfilé")

    def test_builds_note_from_only_the_unstructured_remainder(self):
        assert (
            line_remainder(
                "200 g körsbärstomater (i olika färger)",
                "g",
                "körsbärstomat",
            )
            == "(i olika färger)"
        )

    def test_same_line_ignores_only_whitespace(self):
        assert same_line("3 dl  grädde", " 3 dl grädde ")
        assert not same_line("3 dl grädde", "3 liter grädde")