"""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

import babel.numbers

from conservancy_beancount.reports import core

DEFAULT_STRINGS = [
    ({}, "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': '-5500.00', 'BRL': '-8500.00'}, "-8,500.00 BRL, -5,500 JPY"),
]

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,expected', [
    ({}, True),
    ({'USD': 0}, True),
    ({'USD': 0, 'EUR': 0}, True),
    ({'USD': -10, 'EUR': 0}, False),
    ({'EUR': -10}, False),
    ({'USD': -10, 'EUR': -20}, False),
    ({'USD': 10, 'EUR': -20}, False),
    ({'JPY': 10}, False),
    ({'JPY': 10, 'BRL': 0}, False),
    ({'JPY': 10, 'BRL': 20}, False),
])
def test_eq_zero(balance_map_kwargs, expected):
    amounts = testutil.balance_map(**balance_map_kwargs)
    balance = core.Balance(amounts.items())
    assert balance.eq_zero() == expected
    assert balance.is_zero() == expected

@pytest.mark.parametrize('balance_map_kwargs,expected', [
    ({}, True),
    ({'USD': 0}, True),
    ({'USD': 0, 'EUR': 0}, True),
    ({'EUR': -10}, False),
    ({'USD': 10, 'EUR': -20}, False),
    ({'USD': -10, 'EUR': -20}, False),
    ({'JPY': 10}, True),
    ({'JPY': 10, 'BRL': 0}, True),
    ({'JPY': 10, 'BRL': 20}, True),
])
def test_ge_zero(balance_map_kwargs, expected):
    amounts = testutil.balance_map(**balance_map_kwargs)
    balance = core.Balance(amounts.items())
    assert balance.ge_zero() == expected

@pytest.mark.parametrize('balance_map_kwargs,expected', [
    ({}, True),
    ({'USD': 0}, True),
    ({'USD': 0, 'EUR': 0}, True),
    ({'EUR': -10}, True),
    ({'USD': 10, 'EUR': -20}, False),
    ({'USD': -10, 'EUR': -20}, True),
    ({'JPY': 10}, False),
    ({'JPY': 10, 'BRL': 0}, False),
    ({'JPY': 10, 'BRL': 20}, False),
])
def test_le_zero(balance_map_kwargs, expected):
    amounts = testutil.balance_map(**balance_map_kwargs)
    balance = core.Balance(amounts.items())
    assert balance.le_zero() == expected

@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('kwargs1,kwargs2,expected', [
    ({}, {}, True),
    ({}, {'USD': 0}, True),
    ({}, {'EUR': 1}, False),
    ({'USD': 1}, {'EUR': 1}, False),
    ({'USD': 1}, {'USD': '1.0'}, True),
    ({'USD': 1}, {'USD': '1.0', 'EUR': '2.0'}, False),
    ({'USD': 1, 'BRL': '2.0'}, {'USD': '1.0', 'EUR': '2.0'}, False),
    ({'USD': 1, 'EUR': 2, 'BRL': '3.0'}, {'USD': '1.0', 'EUR': '2.0'}, False),
    ({'USD': 1, 'EUR': 2}, {'USD': '1.0', 'EUR': '2.0'}, True),
])
def test_eq(kwargs1, kwargs2, expected):
    bal1 = core.Balance(testutil.balance_map(**kwargs1))
    bal2 = core.Balance(testutil.balance_map(**kwargs2))
    actual = bal1 == bal2
    assert actual == expected

@pytest.mark.parametrize('balance_map_kwargs,expected', DEFAULT_STRINGS)
def test_str(balance_map_kwargs, expected):
    amounts = testutil.balance_map(**balance_map_kwargs)
    assert str(core.Balance(amounts.items())) == expected

@pytest.mark.parametrize('bal_kwargs,expected', DEFAULT_STRINGS)
def test_format_defaults(bal_kwargs, expected):
    amounts = testutil.balance_map(**bal_kwargs)
    assert core.Balance(amounts).format() == expected

@pytest.mark.parametrize('fmt,expected', [
    ('¤##0.0', '¥5000, -€1500.00'),
    ('#,#00.0¤¤', '5,000JPY, -1,500.00EUR'),
    ('¤+##0.0;¤-##0.0', '¥+5000, €-1500.00'),
    ('#,#00.0 ¤¤;(#,#00.0 ¤¤)', '5,000 JPY, (1,500.00 EUR)'),
])
def test_format_fmt(fmt, expected):
    amounts = testutil.balance_map(JPY=5000, EUR=-1500)
    balance = core.Balance(amounts)
    assert balance.format(fmt) == expected

@pytest.mark.parametrize('sep', [
    '; ',
    '—',
    '\0',
])
def test_format_sep(sep):
    bal_kwargs, expected = DEFAULT_STRINGS[-1]
    expected = expected.replace(', ', sep)
    amounts = testutil.balance_map(**bal_kwargs)
    balance = core.Balance(amounts)
    assert balance.format(sep=sep) == expected

def test_format_none():
    amounts = testutil.balance_map(BRL=65000)
    balance = core.Balance(amounts)
    expected = babel.numbers.format_currency(65000, 'BRL')
    assert balance.format(None) == expected

@pytest.mark.parametrize('empty', [
    "N/A",
    "Zero",
    "ø",
])
def test_format_empty(empty):
    balance = core.Balance()
    assert balance.format(empty=empty) == empty