from decimal import Decimal

import pytest

import fin_defs

USD_0 = fin_defs.AssetAmount(fin_defs.USD, Decimal(0))
USD_10 = fin_defs.AssetAmount(fin_defs.USD, Decimal(10))
USD_11 = fin_defs.AssetAmount(fin_defs.USD, Decimal(11))
USD_20 = fin_defs.AssetAmount(fin_defs.USD, Decimal(20))
USD_21 = fin_defs.AssetAmount(fin_defs.USD, Decimal(21))

DKK_0 = fin_defs.AssetAmount(fin_defs.DKK, Decimal(0))
DKK_21 = fin_defs.AssetAmount(fin_defs.DKK, Decimal(21))


def test_add_asset():
    assert USD_10 + USD_11 == USD_21
    assert USD_10 + USD_0 == USD_10
    assert DKK_0 + USD_10 == USD_10


def test_sub_asset():
    assert USD_21 - USD_10 == USD_11
    assert USD_10 - USD_0 == USD_10
    assert DKK_0 - USD_10 == -USD_10


def test_div_asset():
    assert USD_20 / USD_10 == 2
    assert USD_10 / USD_10 == 1
    assert USD_10 / USD_20 == 0.5


def test_div_amount():
    assert USD_20 / Decimal(2) == USD_10


def test_mult():
    assert USD_10 * Decimal(2) == USD_20


def test_negate():
    assert USD_20 + (-USD_10) == USD_10


def test_compare():
    assert USD_10 < USD_20
    assert USD_10 <= USD_20
    assert not (USD_10 > USD_20)
    assert not (USD_10 >= USD_20)


def test_compare_zero():
    assert DKK_0 < USD_20
    assert DKK_0 <= USD_20
    assert not (DKK_0 > USD_20)
    assert not (DKK_0 >= USD_20)


def test_is_zero():
    assert USD_0.is_zero()
    assert not USD_10.is_zero()


def test_str():
    assert str(USD_0) == '$0.000 USD'
    assert str(USD_10) == '$10.00 USD'
    assert str(USD_11) == '$11.00 USD'
    assert str(-USD_10) == '-$10.00 USD'


def test_mul_wrong():
    with pytest.raises(TypeError, match='other must be Decimal, but was AssetAmount'):
        assert USD_20 * USD_10


def test_add_wrong_type():
    with pytest.raises(TypeError, match='other must be AssetAmount, but was Decimal'):
        assert USD_20 + Decimal(1)


def test_add_wrong_asset():
    with pytest.raises(
        ValueError,
        match='AssetAmount must have same asset, but: fiat:USD != fiat:DKK',
    ):
        assert USD_20 + DKK_21


def test_sub_wrong_type():
    with pytest.raises(TypeError, match='other must be AssetAmount, but was Decimal'):
        assert USD_20 - Decimal(1)


def test_sub_wrong_asset():
    with pytest.raises(
        ValueError,
        match='AssetAmount must have same asset, but: fiat:USD != fiat:DKK',
    ):
        assert USD_20 - DKK_21


def test_cmp_wrong_type():
    with pytest.raises(TypeError, match='other must be AssetAmount, but was Decimal'):
        assert Decimal(1) > USD_20


def test_cmp_wrong_asset():
    with pytest.raises(
        ValueError,
        match='AssetAmount must have same asset, but: fiat:USD != fiat:DKK',
    ):
        assert USD_20 < DKK_21


def test_div_wrong_asset():
    with pytest.raises(
        ValueError,
        match='AssetAmount must have same asset, but: fiat:USD != fiat:DKK',
    ):
        assert USD_21 / DKK_21