from auth.providers.base import SSOProvider
from utils.helpers import extract_html_value


class TUMProvider(SSOProvider):
    """SSO provider for Karlsruhe Institute of Technology (KIT)."""

    name = "TUM"
    domain = "tum.de"

    def authenticate(self) -> str:
        # Implement SAML authentication flow
        # Use self.session, self.redirect_response, self.username, self.password
        # Return HTML containing SAMLResponse

        # to get this done on tum we have to:
        # 1. do one post to e1s1
        # 2. do post to e1s2 with login data
        # ->
        self.session.headers.pop("x-requested-with", None)
        self.session.headers.pop("x-inertia", None)
        self.session.headers.pop("x-inertia-version", None)

        csrf_token1 = extract_html_value(
            self.redirect_response.text, r'name="csrf_token" value="([^"]+)"'
        )

        response1 = self.session.post(
            # 'https://idp.scc.kit.edu/idp/profile/SAML2/Redirect/SSO?execution=e1s1',
            "https://login.tum.de/idp/profile/SAML2/Redirect/SSO?execution=e1s1",
            data={
                "csrf_token": csrf_token1,
                "shib_idp_ls_exception.shib_idp_session_ss": "",
                "shib_idp_ls_success.shib_idp_session_ss": "true",
                "shib_idp_ls_value.shib_idp_session_ss": "",
                "shib_idp_ls_exception.shib_idp_persistent_ss": "",
                "shib_idp_ls_success.shib_idp_persistent_ss": "true",
                "shib_idp_ls_value.shib_idp_persistent_ss": "",
                "shib_idp_ls_supported": "true",
                "_eventId_proceed": "",
            },
        )

        # print(response1.text)
        csrf_token2 = extract_html_value(
            response1.text, r'name="csrf_token" value="([^"]+)"'
        )

        response2 = self.session.post(
            "https://login.tum.de/idp/profile/SAML2/Redirect/SSO?execution=e1s2",
            data={
                "csrf_token": csrf_token2,
                "j_username": self.username,
                "j_password": self.password,
                "donotcache": "1",
                "_eventId_proceed": "",
            },
        )

        # print(response2.text)
        saml_response = extract_html_value(
            response2.text, r'name="SAMLResponse" value="([^"]+)"'
        )

        if len(saml_response) < 3:
            raise ValueError("TUM auth no work:(")
        else:
            print("nice we got saml response starting with: " + saml_response[0:49])
        return response2.text
        # print(saml_response)
        # sys.exit()
        # if "/consume" not in html.unescape(response.text):
        #     raise ValueError("TUM authentication failed - invalid credentials or SSO error")

        # return response.text