import requests
import urllib.parse
import re
from config.constants import AUTH_BASE_URL, ANNY_BASE_URL, DEFAULT_HEADERS
from utils.helpers import extract_html_value
from auth.providers import get_provider, SSOProvider


class AnnySession:
    def __init__(self, username: str, password: str, provider_name: str = "kit"):
        self.session = requests.Session()
        self.username = username
        self.password = password

        # Initialize the SSO provider
        provider_class = get_provider(provider_name)
        self.provider: SSOProvider = provider_class(username, password)

    def login(self):
        try:
            self._init_headers()
            self._sso_login()
            self._provider_auth()
            self._consume_saml()
            print(f"✅ Login successful via {self.provider.name}.")
            return self.session.cookies
        except requests.RequestException as e:
            print(f"[Login Error] Network error: {type(e).__name__}")
            return None
        except ValueError as e:
            print(f"[Login Error] {e}")
            return None
        except KeyError as e:
            print(f"[Login Error] Missing expected field: {e}")
            return None

    def _init_headers(self):
        self.session.headers.update(
            {
                **DEFAULT_HEADERS,
                "accept": "text/html, application/xhtml+xml",
                "referer": AUTH_BASE_URL + "/",
                "origin": AUTH_BASE_URL,
            }
        )

    def _sso_login(self):
        r1 = self.session.get(f"{AUTH_BASE_URL}/login/sso")
        self.session.headers["X-XSRF-TOKEN"] = urllib.parse.unquote(
            r1.cookies["XSRF-TOKEN"]
        )

        page_data = extract_html_value(r1.text, r'data-page="(.*?)"')
        version = re.search(r'"version"\s*:\s*"([a-f0-9]{32})"', page_data)
        x_inertia_version = (
            version.group(1) if version else "66b32acea13402d3aef4488ccd239c93"
        )

        self.session.headers.update(
            {
                "x-requested-with": "XMLHttpRequest",
                "x-inertia": "true",
                "x-inertia-version": x_inertia_version,
            }
        )

        r2 = self.session.post(
            f"{AUTH_BASE_URL}/login/sso", json={"domain": self.provider.domain}
        )
        redirect_url = r2.headers["x-inertia-location"]
        redirect_response = self.session.get(redirect_url)

        # Pass session and redirect response to provider
        self.provider.set_session(self.session)
        self.provider.set_redirect_response(redirect_response)

    def _provider_auth(self):
        """Delegate authentication to the SSO provider."""
        self.saml_response_html = self.provider.authenticate()

    def _consume_saml(self):
        consume_url = extract_html_value(
            self.saml_response_html, r'form action="([^"]+)"'
        )
        relay_state = extract_html_value(
            self.saml_response_html, r'name="RelayState" value="([^"]+)"'
        )
        saml_response = extract_html_value(
            self.saml_response_html, r'name="SAMLResponse" value="([^"]+)"'
        )

        self.session.post(
            consume_url, data={"RelayState": relay_state, "SAMLResponse": saml_response}
        )

        self.session.get(
            f"{ANNY_BASE_URL}/en-us/login?target=/en-us/home?withoutIntent=true"
        )