import datetime
import pathlib

import pytest

from . import relpath
import oxrlib.errors
import oxrlib.loaders

CACHE_PATH = relpath('filecache')
CACHE_PATTERN = '{date}_{base}_cache.json'

@pytest.fixture
def dummycache():
    return oxrlib.loaders.FileCache(CACHE_PATH, CACHE_PATTERN)

@pytest.mark.parametrize('date,base', [
    (datetime.date(1999, 2, 1), 'USD'),
    (datetime.date(1999, 3, 1), 'EUR'),
])
def test_cache_success(dummycache, date, base):
    expect_name = CACHE_PATH / CACHE_PATTERN.format(date=date.isoformat(), base=base)
    with dummycache.historical(date, base) as cache_file:
        assert pathlib.Path(cache_file.name) == expect_name

@pytest.mark.parametrize('date,base', [
    (datetime.date(1999, 2, 1), 'EUR'),
    (datetime.date(1999, 3, 1), 'USD'),
])
def test_cache_not_found(dummycache, date, base):
    try:
        cache_file = dummycache.historical(date, base)
    except oxrlib.errors.LoaderNoDataError:
        pass
    else:
        cache_file.close()
        assert False, "cache file found when unexpected"