"""ASTNG hooks for the Python 2 standard library.

Currently help understanding of :

* hashlib.md5 and hashlib.sha1
"""

from logilab.astng import MANAGER
from logilab.astng.builder import ASTNGBuilder

MODULE_TRANSFORMS = {}

def hashlib_transform(module):
    fake = ASTNGBuilder(MANAGER).string_build('''

class md5(object):
  def __init__(self, value): pass
  def hexdigest(self):
    return u''

class sha1(object):
  def __init__(self, value): pass
  def hexdigest(self):
    return u''

''')
    for hashfunc in ('sha1', 'md5'):
        module.locals[hashfunc] = fake.locals[hashfunc]

def collections_transform(module):
    fake = ASTNGBuilder(MANAGER).string_build('''

class defaultdict(dict):
    default_factory = None
    def __missing__(self, key): pass

class deque(object):
    maxlen = 0
    def __init__(iterable=None, maxlen=None): pass
    def append(self, x): pass
    def appendleft(self, x): pass
    def clear(self): pass
    def count(self, x): return 0
    def extend(self, iterable): pass
    def extendleft(self, iterable): pass
    def pop(self): pass
    def popleft(self): pass
    def remove(self, value): pass
    def reverse(self): pass
    def rotate(self, n): pass

''')

    for klass in ('deque', 'defaultdict'):
        module.locals[klass] = fake.locals[klass]

def pkg_resources_transform(module):
    fake = ASTNGBuilder(MANAGER).string_build('''

def resource_exists(package_or_requirement, resource_name):
    pass

def resource_isdir(package_or_requirement, resource_name):
    pass

def resource_filename(package_or_requirement, resource_name):
    pass

def resource_stream(package_or_requirement, resource_name):
    pass

def resource_string(package_or_requirement, resource_name):
    pass

def resource_listdir(package_or_requirement, resource_name):
    pass

def extraction_error():
    pass

def get_cache_path(archive_name, names=()):
    pass

def postprocess(tempname, filename):
    pass

def set_extraction_path(path):
    pass

def cleanup_resources(force=False):
    pass

''')

    for func_name, func in fake.locals.items():
        module.locals[func_name] = func

    # for func in ('resource_exists', 'resource_isdir', 'resource_filename',
    #     'resource_stream', 'resource_string', 'resource_listdir',
    #     'extraction_error', 'get_cache_path', 'postprocess',
    #     'set_extraction_path', 'cleanup_resources'):

    #     module.locals[func] = fake.locals[func]

MODULE_TRANSFORMS['hashlib'] = hashlib_transform
MODULE_TRANSFORMS['collections'] = collections_transform
MODULE_TRANSFORMS['pkg_resources'] = pkg_resources_transform


def transform(module):
    try:
        tr = MODULE_TRANSFORMS[module.name]
    except KeyError:
        pass
    else:
        tr(module)

from logilab.astng import MANAGER
MANAGER.register_transformer(transform)