"""test_reports_balance - Unit tests for reports.core.Balance"""
# Copyright © 2020  Brett Smith
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import itertools

from decimal import Decimal

import pytest

from . import testutil

from conservancy_beancount.reports import core

def test_empty_balance():
    balance = core.Balance()
    assert not balance
    assert len(balance) == 0
    assert balance.is_zero()
    with pytest.raises(KeyError):
        balance['USD']

@pytest.mark.parametrize('currencies', [
    'USD',
    'EUR GBP',
    'JPY INR BRL',
])
def test_zero_balance(currencies):
    keys = currencies.split()
    balance = core.Balance(testutil.balance_map((key, 0) for key in keys))
    assert balance
    assert len(balance) == len(keys)
    assert balance.is_zero()
    assert all(balance[key].number == 0 for key in keys)
    assert all(balance[key].currency == key for key in keys)

@pytest.mark.parametrize('currencies', [
    'USD',
    'EUR GBP',
    'JPY INR BRL',
])
def test_nonzero_balance(currencies):
    amounts = testutil.balance_map(zip(currencies.split(), itertools.count(110, 100)))
    balance = core.Balance(amounts.items())
    assert balance
    assert len(balance) == len(amounts)
    assert not balance.is_zero()
    assert all(balance[key] == amt for key, amt in amounts.items())

def test_mixed_balance():
    amounts = testutil.balance_map(USD=0, EUR=120)
    balance = core.Balance(amounts.items())
    assert balance
    assert len(balance) == 2
    assert not balance.is_zero()
    assert all(balance[key] == amt for key, amt in amounts.items())

@pytest.mark.parametrize('balance_map_kwargs', [
    {},
    {'USD': 0},
    {'EUR': 10},
    {'JPY': 20, 'BRL': 30},
    {'EUR': -15},
    {'JPY': -25, 'BRL': -35},
    {'JPY': 40, 'USD': 0, 'EUR': -50},
])
def test_neg(balance_map_kwargs):
    amounts = testutil.balance_map(**balance_map_kwargs)
    actual = -core.Balance(amounts.items())
    assert set(actual) == set(balance_map_kwargs)
    for key in balance_map_kwargs:
        assert actual[key] == -amounts[key]

@pytest.mark.parametrize('balance_map_kwargs,expected', [
    ({}, "Zero balance"),
    ({'JPY': 0, 'BRL': 0}, "Zero balance"),
    ({'USD': '20.00'}, "20.00 USD"),
    ({'EUR': '50.00', 'GBP': '80.00'}, "80.00 GBP, 50.00 EUR"),
    ({'JPY': '-55.00', 'BRL': '-85.00'}, "-85.00 BRL, -55.00 JPY"),
])
def test_str(balance_map_kwargs, expected):
    amounts = testutil.balance_map(**balance_map_kwargs)
    assert str(core.Balance(amounts.items())) == expected