# -*- coding: utf-8 -*-
"""
    werkzeug
    ~~~~~~~~

    Werkzeug is the Swiss Army knife of Python web development.

    It provides useful classes and functions for any WSGI application to make
    the life of a python web developer much easier.  All of the provided
    classes are independent from each other so you can mix it with any other
    library.


    :copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
    :license: BSD, see LICENSE for more details.
"""
from types import ModuleType
import sys

from werkzeug._compat import iteritems

# the version.  Usually set automatically by a script.
__version__ = '0.11.16-dev'


# This import magic raises concerns quite often which is why the implementation
# and motivation is explained here in detail now.
#
# The majority of the functions and classes provided by Werkzeug work on the
# HTTP and WSGI layer.  There is no useful grouping for those which is why
# they are all importable from "werkzeug" instead of the modules where they are
# implemented.  The downside of that is, that now everything would be loaded at
# once, even if unused.
#
# The implementation of a lazy-loading module in this file replaces the
# werkzeug package when imported from within.  Attribute access to the werkzeug
# module will then lazily import from the modules that implement the objects.


# import mapping to objects in other modules
all_by_module = {
    'werkzeug.debug': ['DebuggedApplication'],
    'werkzeug.local': ['Local', 'LocalManager', 'LocalProxy', 'LocalStack',
                       'release_local'],
    'werkzeug.serving': ['run_simple'],
    'werkzeug.test': ['Client', 'EnvironBuilder', 'create_environ',
                      'run_wsgi_app'],
    'werkzeug.testapp': ['test_app'],
    'werkzeug.exceptions': ['abort', 'Aborter'],
    'werkzeug.urls': ['url_decode', 'url_encode', 'url_quote',
                      'url_quote_plus', 'url_unquote', 'url_unquote_plus',
                      'url_fix', 'Href', 'iri_to_uri', 'uri_to_iri'],
    'werkzeug.formparser': ['parse_form_data'],
    'werkzeug.utils': ['escape', 'environ_property', 'append_slash_redirect',
                       'redirect', 'cached_property', 'import_string',
                       'dump_cookie', 'parse_cookie', 'unescape',
                       'format_string', 'find_modules', 'header_property',
                       'html', 'xhtml', 'HTMLBuilder', 'validate_arguments',
                       'ArgumentValidationError', 'bind_arguments',
                       'secure_filename'],
    'werkzeug.wsgi': ['get_current_url', 'get_host', 'pop_path_info',
                      'peek_path_info', 'SharedDataMiddleware',
                      'DispatcherMiddleware', 'ClosingIterator', 'FileWrapper',
                      'make_line_iter', 'LimitedStream', 'responder',
                      'wrap_file', 'extract_path_info'],
    'werkzeug.datastructures': ['MultiDict', 'CombinedMultiDict', 'Headers',
                                'EnvironHeaders', 'ImmutableList',
                                'ImmutableDict', 'ImmutableMultiDict',
                                'TypeConversionDict',
                                'ImmutableTypeConversionDict', 'Accept',
                                'MIMEAccept', 'CharsetAccept',
                                'LanguageAccept', 'RequestCacheControl',
                                'ResponseCacheControl', 'ETags', 'HeaderSet',
                                'WWWAuthenticate', 'Authorization',
                                'FileMultiDict', 'CallbackDict', 'FileStorage',
                                'OrderedMultiDict', 'ImmutableOrderedMultiDict'
                                ],
    'werkzeug.useragents':  ['UserAgent'],
    'werkzeug.http': ['parse_etags', 'parse_date', 'http_date', 'cookie_date',
                      'parse_cache_control_header', 'is_resource_modified',
                      'parse_accept_header', 'parse_set_header', 'quote_etag',
                      'unquote_etag', 'generate_etag', 'dump_header',
                      'parse_list_header', 'parse_dict_header',
                      'parse_authorization_header',
                      'parse_www_authenticate_header', 'remove_entity_headers',
                      'is_entity_header', 'remove_hop_by_hop_headers',
                      'parse_options_header', 'dump_options_header',
                      'is_hop_by_hop_header', 'unquote_header_value',
                      'quote_header_value', 'HTTP_STATUS_CODES'],
    'werkzeug.wrappers': ['BaseResponse', 'BaseRequest', 'Request', 'Response',
                          'AcceptMixin', 'ETagRequestMixin',
                          'ETagResponseMixin', 'ResponseStreamMixin',
                          'CommonResponseDescriptorsMixin', 'UserAgentMixin',
                          'AuthorizationMixin', 'WWWAuthenticateMixin',
                          'CommonRequestDescriptorsMixin'],
    'werkzeug.security': ['generate_password_hash', 'check_password_hash'],
    # the undocumented easteregg ;-)
    'werkzeug._internal': ['_easteregg']
}

# modules that should be imported when accessed as attributes of werkzeug
attribute_modules = frozenset(['exceptions', 'routing', 'script'])


object_origins = {}
for module, items in iteritems(all_by_module):
    for item in items:
        object_origins[item] = module


class module(ModuleType):

    """Automatically import objects from the modules."""

    def __getattr__(self, name):
        if name in object_origins:
            module = __import__(object_origins[name], None, None, [name])
            for extra_name in all_by_module[module.__name__]:
                setattr(self, extra_name, getattr(module, extra_name))
            return getattr(module, name)
        elif name in attribute_modules:
            __import__('werkzeug.' + name)
        return ModuleType.__getattribute__(self, name)

    def __dir__(self):
        """Just show what we want to show."""
        result = list(new_module.__all__)
        result.extend(('__file__', '__path__', '__doc__', '__all__',
                       '__docformat__', '__name__', '__path__',
                       '__package__', '__version__'))
        return result

# keep a reference to this module so that it's not garbage collected
old_module = sys.modules['werkzeug']


# setup the new module and patch it into the dict of loaded modules
new_module = sys.modules['werkzeug'] = module('werkzeug')
new_module.__dict__.update({
    '__file__':         __file__,
    '__package__':      'werkzeug',
    '__path__':         __path__,
    '__doc__':          __doc__,
    '__version__':      __version__,
    '__all__':          tuple(object_origins) + tuple(attribute_modules),
    '__docformat__':    'restructuredtext en'
})


# Due to bootstrapping issues we need to import exceptions here.
# Don't ask :-(
__import__('werkzeug.exceptions')
