from app.mecenat.number_words import amount_in_words


def test_zero_centimes_only_euros():
    assert amount_in_words(15.0) == "Quinze euros"


def test_singular_euro_has_no_s():
    assert amount_in_words(1.0) == "Un euro"


def test_et_un_forms():
    assert amount_in_words(21.0) == "Vingt et un euros"
    assert amount_in_words(31.0) == "Trente et un euros"
    assert amount_in_words(61.0) == "Soixante et un euros"


def test_seventies_irregular_et_onze():
    assert amount_in_words(70.0) == "Soixante-dix euros"
    assert amount_in_words(71.0) == "Soixante et onze euros"
    assert amount_in_words(72.0) == "Soixante-douze euros"
    assert amount_in_words(79.0) == "Soixante-dix-neuf euros"


def test_eighties_no_et_ever():
    assert amount_in_words(80.0) == "Quatre-vingts euros"
    assert amount_in_words(81.0) == "Quatre-vingt-un euros"
    assert amount_in_words(91.0) == "Quatre-vingt-onze euros"
    assert amount_in_words(99.0) == "Quatre-vingt-dix-neuf euros"


def test_hundreds_agreement():
    assert amount_in_words(100.0) == "Cent euros"
    assert amount_in_words(101.0) == "Cent un euros"
    assert amount_in_words(200.0) == "Deux cents euros"
    assert amount_in_words(201.0) == "Deux cent un euros"


def test_thousands_are_invariable():
    assert amount_in_words(1000.0) == "Mille euros"
    assert amount_in_words(2000.0) == "Deux mille euros"
    assert amount_in_words(1234.0) == "Mille deux cent trente-quatre euros"


def test_cents_only_when_no_euros():
    assert amount_in_words(0.5) == "Cinquante centimes"
    assert amount_in_words(0.01) == "Un centime"


def test_euros_and_cents_joined_with_et():
    assert amount_in_words(1234.56) == (
        "Mille deux cent trente-quatre euros et cinquante-six centimes"
    )
    assert amount_in_words(1.01) == "Un euro et un centime"


def test_rounds_to_the_nearest_cent():
    # Erreurs de flottant (ex. 0.1 + 0.2) ne doivent jamais se voir.
    assert amount_in_words(19.999999) == "Vingt euros"