# -*- coding: utf-8 -*-
from requests import Session
from requests.auth import AuthBase
from authlib.oauth1 import (
    SIGNATURE_HMAC_SHA1,
    SIGNATURE_TYPE_HEADER,
)
from authlib.common.encoding import to_native
from authlib.oauth1 import ClientAuth
from authlib.oauth1.client import OAuth1Client
from ..base_client import OAuthError


class OAuth1Auth(AuthBase, ClientAuth):
    """Signs the request using OAuth 1 (RFC5849)"""

    def __call__(self, req):
        url, headers, body = self.prepare(
            req.method, req.url, req.headers, req.body)

        req.url = to_native(url)
        req.prepare_headers(headers)
        if body:
            req.body = body
        return req


class OAuth1Session(OAuth1Client, Session):
    auth_class = OAuth1Auth

    def __init__(self, client_id, client_secret=None,
                 token=None, token_secret=None,
                 redirect_uri=None, rsa_key=None, verifier=None,
                 signature_method=SIGNATURE_HMAC_SHA1,
                 signature_type=SIGNATURE_TYPE_HEADER,
                 force_include_body=False, **kwargs):
        Session.__init__(self)
        OAuth1Client.__init__(
            self, session=self,
            client_id=client_id, client_secret=client_secret,
            token=token, token_secret=token_secret,
            redirect_uri=redirect_uri, rsa_key=rsa_key, verifier=verifier,
            signature_method=signature_method, signature_type=signature_type,
            force_include_body=force_include_body, **kwargs)

    def rebuild_auth(self, prepared_request, response):
        """When being redirected we should always strip Authorization
        header, since nonce may not be reused as per OAuth spec.
        """
        if 'Authorization' in prepared_request.headers:
            # If we get redirected to a new host, we should strip out
            # any authentication headers.
            prepared_request.headers.pop('Authorization', True)
            prepared_request.prepare_auth(self.auth)

    @staticmethod
    def handle_error(error_type, error_description):
        raise OAuthError(error_type, error_description)
