"""test_books_loader - Unit tests for books Loader class"""
# 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/>.

from datetime import date
from pathlib import Path

import pytest

from . import testutil

from conservancy_beancount import books

books_path = testutil.test_path('booksroot')

@pytest.fixture(scope='module')
def conservancy_loader():
    return books.Loader(books_path, books.FiscalYear(3))

def format_include(year, subdir=''):
    path = Path(books_path, subdir, f'{year}.beancount')
    return f'include "{path}"'

def format_plugin(name, optstring=None):
    if optstring is None:
        return f'plugin "{name}"'
    else:
        return f'plugin "{name}" "{optstring}"'

def expect_string(years, plugins={'conservancy_beancount.plugin': None}):
    years = iter(years)
    year1_s = format_include(next(years), 'books')
    return '\n'.join([
        *(format_plugin(name, opts) for name, opts in plugins.items()),
        year1_s,
        *(format_include(year) for year in years),
    ])

@pytest.mark.parametrize('range_start,range_stop,expect_years', [
    (2019, 2020, [2019, 2020]),
    (-1, 2020, [2019, 2020]),
    (date(2019, 1, 1), date(2020, 6, 1), range(2018, 2021)),
    (-1, date(2020, 2, 1), [2018, 2019]),
])
def test_fy_range_string(conservancy_loader, range_start, range_stop, expect_years):
    expected = expect_string(expect_years)
    assert conservancy_loader.fy_range_string(range_start, range_stop) == expected

@pytest.mark.parametrize('year_offset', range(-3, 1))
def test_fy_range_string_one_offset(conservancy_loader, year_offset):
    this_year = date.today().year
    expected = expect_string(range(this_year + year_offset, this_year + 1))
    assert conservancy_loader.fy_range_string(year_offset) == expected

@pytest.mark.parametrize('plugins', [
    {},
    {'conservancy_beancount.plugin': '-all'},
])
def test_fy_range_string_plugins_override(conservancy_loader, plugins):
    expected = expect_string([2019, 2020], plugins)
    assert conservancy_loader.fy_range_string(2019, 2020, plugins) == expected

def test_fy_range_string_empty_range(conservancy_loader):
    assert conservancy_loader.fy_range_string(2020, 2019) == ''