import urllib


class RedirectUriError(Exception):

    error = 'Redirect URI Error'
    description = 'The request fails due to a missing, invalid, or mismatching redirection URI (redirect_uri).'


class ClientIdError(Exception):

    error = 'Client ID Error'
    description = 'The client identifier (client_id) is missing or invalid.'


class AuthorizeError(Exception):

    _errors = {
        # Oauth2 errors.
        # https://tools.ietf.org/html/rfc6749#section-4.1.2.1
        'invalid_request': 'The request is otherwise malformed',

        'unauthorized_client': 'The client is not authorized to request an authorization code using this method',

        'access_denied': 'The resource owner or authorization server denied the request',

        'unsupported_response_type': 'The authorization server does not support obtaining an authorization code using '
                                     'this method',

        'invalid_scope': 'The requested scope is invalid, unknown, or malformed',

        'server_error': 'The authorization server encountered an error',

        'temporarily_unavailable': 'The authorization server is currently unable to handle the request due to a '
                                   'temporary overloading or maintenance of the server',

        # OpenID errors.
        # http://openid.net/specs/openid-connect-core-1_0.html#AuthError
        'interaction_required': 'The Authorization Server requires End-User interaction of some form to proceed',

        'login_required': 'The Authorization Server requires End-User authentication',

        'account_selection_required': 'The End-User is required to select a session at the Authorization Server',

        'consent_required': 'The Authorization Server requires End-User consent',

        'invalid_request_uri': 'The request_uri in the Authorization Request returns an error or contains invalid data',

        'invalid_request_object': 'The request parameter contains an invalid Request Object',

        'request_not_supported': 'The provider does not support use of the request parameter',

        'request_uri_not_supported': 'The provider does not support use of the request_uri parameter',

        'registration_not_supported': 'The provider does not support use of the registration parameter',
    }

    def __init__(self, redirect_uri, error, grant_type):

        self.error = error
        self.description = self._errors.get(error)
        self.redirect_uri = redirect_uri
        self.grant_type = grant_type

    def create_uri(self, redirect_uri, state):

        description = urllib.quote(self.description)

        # See: http://openid.net/specs/openid-connect-core-1_0.html#ImplicitAuthError
        hash_or_question = '#' if self.grant_type == 'implicit' else '?'

        uri = '{0}{1}error={2}&error_description={3}'.format(
            redirect_uri,
            hash_or_question,
            self.error,
            description)

        # Add state if present.
        uri = uri + ('&state={0}'.format(state) if state else '')

        return uri

    @property
    def response(self):
        pass


class TokenError(Exception):

    _errors = {
        # Oauth2 errors.
        # https://tools.ietf.org/html/rfc6749#section-5.2
        'invalid_request': 'The request is otherwise malformed',

        'invalid_client': 'Client authentication failed (e.g., unknown client, no client authentication included, '
                          'or unsupported authentication method)',

        'invalid_grant': 'The provided authorization grant or refresh token is invalid, expired, revoked, does not '
                         'match the redirection URI used in the authorization request, or was issued to another client',

        'unauthorized_client': 'The authenticated client is not authorized to use this authorization grant type',

        'unsupported_grant_type': 'The authorization grant type is not supported by the authorization server',

        'invalid_scope': 'The requested scope is invalid, unknown, malformed, or exceeds the scope granted by the '
                         'resource owner',
    }

    def __init__(self, error):

        self.error = error
        self.description = self._errors.get(error)

    def create_dict(self):

        dic = {
            'error': self.error,
            'error_description': self.description,
        }

        return dic


class UserInfoError(Exception):
    _errors = {
        # Oauth2 errors.
        # https://tools.ietf.org/html/rfc6750#section-3.1
        'invalid_request': (
            'The request is otherwise malformed', 400
        ),
        'invalid_token': (
            'The access token provided is expired, revoked, malformed, or invalid for other reasons', 401
        ),
        'insufficient_scope': (
            'The request requires higher privileges than provided by the access token', 403
        ),
    }

    def __init__(self, code):

        self.code = code
        error_tuple = self._errors.get(code, ('', ''))
        self.description = error_tuple[0]
        self.status = error_tuple[1]