import contextlib
import datetime
import itertools
import logging
import os
import pathlib

START_DATE = datetime.date.today()

from unittest import mock

import pytest
from import2ledger import config, errors

from . import DATA_DIR

def config_from_file(path, arglist=[], stdout=None, stderr=None):
    path = pathlib.Path(path)
    if not path.is_absolute():
        path = DATA_DIR / path
    arglist = ['-C', path.as_posix(), *arglist, os.devnull]
    return config.Configuration(arglist, stdout, stderr)

def test_defaults():
    config = config_from_file('test_config.ini', ['--sign', 'GBP', '-O', 'out_arg'])
    factory = mock.Mock(name='Template')
    template = config.get_template('one', 'Templates', factory)
    assert factory.called
    kwargs = factory.call_args[1]
    assert list(kwargs.pop('signed_currencies', '')) == ['GBP']
    assert kwargs == {
        'date_fmt': '%Y-%m-%d',
        'signed_currency_fmt': kwargs['signed_currency_fmt'],
        'template_name': 'one',
        'unsigned_currency_fmt': kwargs['unsigned_currency_fmt'],
    }

def test_template_parsing():
    config = config_from_file('test_config.ini')
    factory = mock.Mock(name='Template')
    template = config.get_template('two', 'Templates', factory)
    try:
        tmpl_s = factory.call_args[0][0]
    except IndexError as error:
        assert False, error
    assert "\n;Tag1: {value}\n" in tmpl_s
    assert "\nIncome:Donations  -{amount}\n" in tmpl_s
    assert "\n;IncomeTag: Donations\n" in tmpl_s

@pytest.mark.parametrize('arg_s', [None, '-', 'output.ledger'])
def test_output_path(arg_s):
    arglist = [] if arg_s is None else ['-O', arg_s]
    config = config_from_file(os.devnull, arglist)
    output_path = config.get_output_path()
    if (arg_s is None) or (arg_s == '-'):
        assert output_path is None
    else:
        assert output_path == pathlib.Path(arg_s)

def test_output_path_from_section():
    expected_path = pathlib.Path('Template.output')
    config = config_from_file('test_config.ini', ['-O', 'output.ledger'])
    assert config.get_output_path('Templates') == expected_path
    assert config.get_output_path() != expected_path
    with config.from_section('Templates'):
        assert config.get_output_path() == expected_path

@pytest.mark.parametrize('range_s,date_fmt', [
    (range_s.replace('/', sep), sep.join(['%Y', '%m', '%d']))
    for range_s, sep in itertools.product([
            '-',
            '2016/06/01-2016/06/30',
            '2016/06/01-',
            '-2016/06/30',
            ], '/-')
])
def test_date_in_want_range(range_s, date_fmt):
    config = config_from_file(os.devnull, ['--date-range=' + range_s, '--date-format', date_fmt])
    assert config.date_in_want_range(datetime.date(2016, 5, 31)) == range_s.startswith('-')
    assert config.date_in_want_range(datetime.date(2016, 6, 1))
    assert config.date_in_want_range(datetime.date(2016, 6, 30))
    assert config.date_in_want_range(datetime.date(2016, 7, 1)) == range_s.endswith('-')

@pytest.mark.parametrize('arglist,expect_date', [
    ([], None),
    (['-d', '2017-10-12'], datetime.date(2017, 10, 12)),
    (['-c', 'Date'], datetime.date(2017, 10, 8)),
])
def test_default_date(arglist, expect_date):
    config = config_from_file('test_config.ini', arglist)
    default_date = config.get_default_date()
    if expect_date is None:
        assert START_DATE <= default_date <= datetime.date.today()
    else:
        assert default_date == expect_date
    assert config.get_default_date('Date') == datetime.date(2017, 10, 8)

@pytest.mark.parametrize('level_s,expect_level', [
    (s, getattr(logging, s.upper()))
    for s in ['critical', 'debug', 'error', 'info', 'warning']
])
def test_loglevel(level_s, expect_level):
    config = config_from_file(os.devnull, ['--loglevel', level_s])
    assert config.get_loglevel() == expect_level

@contextlib.contextmanager
def bad_config(expect_input):
    with pytest.raises(errors.UserInputConfigurationError) as exc_info:
        yield exc_info
    assert exc_info.value.user_input == expect_input

def test_bad_default_date():
    date_s = '2017-10-06'
    with bad_config(date_s):
        config = config_from_file(os.devnull, ['--date', date_s])
        config.get_default_date()

def test_bad_loglevel():
    with bad_config('wraning'):
        config = config_from_file('test_config.ini', ['-c', 'Bad Loglevel'])
        config.get_loglevel()

def test_undefined_template():
    template_name = 'template nonexistent'
    config = config_from_file(os.devnull)
    with bad_config(template_name):
        config.get_template(template_name)