import six
import hashlib
import base64


class Result(object):
    pass


def lazy(func):
    result = Result()

    def wrapper(*args, **kwargs):
        try:
            return result._result
        except AttributeError:
            result._result = func(*args, **kwargs)

        return result._result

    return wrapper


def cache_by_second_arg(func):
    result = {}

    def wrapper(arg0, arg1, *args, **kwargs):
        try:
            return result[arg1]
        except KeyError:
            result[arg1] = func(arg0, arg1, *args, **kwargs)

        return result[arg1]

    return wrapper


def pathid(path):
    return six.ensure_str(base64.b32encode(hashlib.md5(six.ensure_binary(path)).digest()).lower().strip(b'='))


def listid(items):
    return pathid(str(sorted(items)))


def sort_uniq(items):
    return sorted(set(items))


def stripext(fname):
    return fname[: fname.rfind('.')]


def tobuilddir(fname):
    if not fname:
        return '$B'
    if fname.startswith('$S'):
        return fname.replace('$S', '$B', 1)
    else:
        return fname


def sort_by_keywords(keywords, args):
    flat = []
    res = {}

    cur_key = None
    limit = -1
    for arg in args:
        if arg in keywords:
            limit = keywords[arg]
            if limit == 0:
                res[arg] = True
                cur_key = None
                limit = -1
            else:
                cur_key = arg
            continue
        if limit == 0:
            cur_key = None
            limit = -1
        if cur_key:
            if cur_key in res:
                res[cur_key].append(arg)
            else:
                res[cur_key] = [arg]
            limit -= 1
        else:
            flat.append(arg)
    return (flat, res)


def get_norm_unit_path(unit, extra=None):
    path = strip_roots(unit.path())
    if extra:
        return '{}/{}'.format(path, extra)
    return path


def resolve_common_const(path):
    if path.startswith('${ARCADIA_ROOT}'):
        return path.replace('${ARCADIA_ROOT}', '$S', 1)
    if path.startswith('${ARCADIA_BUILD_ROOT}'):
        return path.replace('${ARCADIA_BUILD_ROOT}', '$B', 1)
    return path


def get(fun, num):
    return fun()[num][0]


def resolve_includes(unit, src, paths):
    return unit.resolve_include([src] + paths) if paths else []


def rootrel_arc_src(src, unit):
    if src.startswith('${ARCADIA_ROOT}/'):
        return src[16:]

    if src.startswith('${ARCADIA_BUILD_ROOT}/'):
        return src[22:]

    elif src.startswith('${CURDIR}/'):
        return unit.path()[3:] + '/' + src[10:]

    else:
        resolved = unit.resolve_arc_path(src)

        if resolved.startswith('$S/'):
            return resolved[3:]

        return src  # leave as is


def skip_build_root(x):
    if x.startswith('${ARCADIA_BUILD_ROOT}'):
        return x[len('${ARCADIA_BUILD_ROOT}') :].lstrip('/')

    return x


def filter_out_by_keyword(test_data, keyword):
    def _iterate():
        i = 0
        while i < len(test_data):
            if test_data[i] == keyword:
                i += 2
            else:
                yield test_data[i]
                i += 1

    return list(_iterate())


def strip_roots(path):
    for prefix in ["$B/", "$S/"]:
        if path.startswith(prefix):
            return path[len(prefix) :]
    return path


def to_yesno(x):
    return "yes" if x else "no"


def get_no_lint_value(unit):
    import ymake

    supported_no_lint_values = ('none', 'none_internal', 'ktlint')
    no_lint_value = unit.get('_NO_LINT_VALUE')
    if no_lint_value and no_lint_value not in supported_no_lint_values:
        ymake.report_configure_error('Unsupported value for NO_LINT macro: {}'.format(no_lint_value))
    return no_lint_value


def ugly_conftest_exception(path):
    """
    FIXME:
    TAXICOMMON-9288: Taxi abused bug with absolute paths and built conftest descovery upon it
    until the issue is filed let's limit impact only to existing files.
    Never let this list grow!!! Fix issue before adding any new violating conftests
    """
    exceptions = [
        'taxi/uservices/userver-arc-utils/functional_tests/basic/conftest.py',
        'taxi/uservices/userver-arc-utils/functional_tests/basic_chaos/conftest.py',
        'taxi/uservices/userver-arc-utils/functional_tests/json2yaml/conftest.py',
    ]

    if not path.endswith('conftest.py'):
        return False
    for e in exceptions:
        if path.endswith(e):
            return True
    return False