# pylint:disable=protected-access ; allowed for test code

import random
import datetime as dt

import pytest

from pycalver import version
from pycalver import patterns


def test_bump_beta():
    cur_version = "v201712.0001-beta"
    assert cur_version < version.incr(cur_version)
    assert version.incr(cur_version).endswith("-beta")
    assert version.incr(cur_version, release="alpha").endswith("-alpha")
    assert version.incr(cur_version, release="final").endswith("0002")


def test_bump_final():
    cur_version = "v201712.0001"
    assert cur_version < version.incr(cur_version)
    assert version.incr(cur_version).endswith(".0002")
    assert version.incr(cur_version, release="alpha").endswith("-alpha")

    assert version.incr(cur_version, release="final").endswith(".0002")

    pre_version = cur_version + "-beta"
    assert version.incr(pre_version, release="final").endswith(".0002")


def test_bump_future():
    """Test that versions don't go back in time."""
    future_date   = dt.datetime.today() + dt.timedelta(days=300)
    future_calver = future_date.strftime("v%Y%m")
    cur_version   = future_calver + ".0001"
    new_version   = version.incr(cur_version)
    assert cur_version < new_version


def test_bump_random(monkeypatch):
    cur_date    = dt.date(2016, 1, 1) + dt.timedelta(days=random.randint(1, 2000))
    cur_version = cur_date.strftime("v%Y%m") + ".0001-dev"

    monkeypatch.setattr(version, 'TODAY', cur_date)

    for _ in range(1000):
        cur_date += dt.timedelta(days=int((1 + random.random()) ** 10))
        new_version = version.incr(
            cur_version, release=random.choice([None, "alpha", "beta", "rc", "final", "post"])
        )
        assert cur_version < new_version
        cur_version = new_version


def test_parse_version_info():
    version_str  = "v201712.0001-alpha"
    version_info = version.parse_version_info(version_str)

    # assert version_info.pep440_version == "201712.1a0"
    # assert version_info.version        == "v201712.0001-alpha"
    assert version_info.year  == 2017
    assert version_info.month == 12
    assert version_info.bid   == "0001"
    assert version_info.tag   == "alpha"

    version_str  = "v201712.0001"
    version_info = version.parse_version_info(version_str)

    # assert version_info.pep440_version == "201712.1"
    # assert version_info.version        == "v201712.0001"
    assert version_info.year  == 2017
    assert version_info.month == 12
    assert version_info.bid   == "0001"
    assert version_info.tag   == "final"


def test_readme_pycalver1():
    version_str  = "v201712.0001-alpha"
    version_info = patterns.PYCALVER_RE.match(version_str).groupdict()

    assert version_info == {
        'pycalver'   : "v201712.0001-alpha",
        'vYYYYMM'    : "v201712",
        'year'       : "2017",
        'month'      : "12",
        'build'      : ".0001",
        'build_no'   : "0001",
        'release'    : "-alpha",
        'release_tag': "alpha",
    }


def test_readme_pycalver2():
    version_str  = "v201712.0033"
    version_info = patterns.PYCALVER_RE.match(version_str).groupdict()

    assert version_info == {
        'pycalver'   : "v201712.0033",
        'vYYYYMM'    : "v201712",
        'year'       : "2017",
        'month'      : "12",
        'build'      : ".0033",
        'build_no'   : "0033",
        'release'    : None,
        'release_tag': None,
    }


def test_parse_error_empty():
    try:
        version.parse_version_info("")
        assert False
    except version.PatternError as err:
        assert "Invalid version string" in str(err)


def test_parse_error_noprefix():
    try:
        version.parse_version_info("201809.0002")
        assert False
    except version.PatternError as err:
        assert "Invalid version string" in str(err)


def test_parse_error_nopadding():
    try:
        version.parse_version_info("v201809.2b0")
        assert False
    except version.PatternError as err:
        assert "Invalid version string" in str(err)


def test_part_field_mapping():
    a_names = set(version.PATTERN_PART_FIELDS.keys())
    b_names = set(patterns.PART_PATTERNS.keys())
    c_names = set(patterns.COMPOSITE_PART_PATTERNS.keys())

    a_extra_names = a_names - b_names
    assert not any(a_extra_names), sorted(a_extra_names)
    b_extra_names = b_names - (a_names | c_names)
    assert not any(b_extra_names), sorted(b_extra_names)

    a_fields = set(version.PATTERN_PART_FIELDS.values())
    b_fields = set(version.VersionInfo._fields)

    a_extra_fields = a_fields - b_fields
    b_extra_fields = b_fields - a_fields
    assert not any(a_extra_fields), sorted(a_extra_fields)
    assert not any(b_extra_fields), sorted(b_extra_fields)


def vnfo(**field_values):
    return version._parse_field_values(field_values)


PARSE_VERSION_TEST_CASES = [
    # TODO (mb 2020-09-06): add tests for new style patterns
    # ["YYYY.MM.DD"                      , "2017.06.07", vnfo(year="2017", month="06", dom="07")],
    ["{year}.{month}.{dom}"            , "2017.06.07", vnfo(year="2017", month="06", dom="07")],
    ["{year}.{month}.{dom_short}"      , "2017.06.7" , vnfo(year="2017", month="06", dom="7" )],
    ["{year}.{month}.{dom_short}"      , "2017.06.7" , vnfo(year="2017", month="06", dom="7" )],
    ["{year}.{month_short}.{dom_short}", "2017.6.7"  , vnfo(year="2017", month="6" , dom="7" )],
    ["{year}.{month}.{dom}"            , "2017.6.07" , None],
    ["{year}.{month}.{dom}"            , "2017.06.7" , None],
    ["{year}.{month_short}.{dom}"      , "2017.06.7" , None],
    ["{year}.{month}.{dom_short}"      , "2017.6.07" , None],
    ["{year}.{month_short}.{MINOR}"    , "2017.6.7"  , vnfo(year="2017", month="6" , minor="7" )],
    ["{year}.{month}.{MINOR}"          , "2017.06.7" , vnfo(year="2017", month="06", minor="7" )],
    ["{year}.{month}.{MINOR}"          , "2017.06.07", vnfo(year="2017", month="06", minor="07")],
    ["{year}.{month}.{MINOR}"          , "2017.6.7"  , None],
]


@pytest.mark.parametrize("pattern_str, line, expected_vinfo", PARSE_VERSION_TEST_CASES)
def test_parse_versions(pattern_str, line, expected_vinfo):
    pattern       = patterns.compile_pattern(pattern_str)
    version_match = pattern.regexp.search(line)

    if expected_vinfo is None:
        assert version_match is None
        return

    assert version_match is not None

    version_str  = version_match.group(0)
    version_info = version.parse_version_info(version_str, pattern_str)

    assert version_info == expected_vinfo