"""Facebook SSO Login Helper."""

from typing import TYPE_CHECKING, ClassVar, Optional

from fastapi_sso.sso.base import DiscoveryDocument, OpenID, SSOBase

if TYPE_CHECKING:
    import httpx  # pragma: no cover


class FacebookSSO(SSOBase):
    """Class providing login via Facebook OAuth."""

    provider = "facebook"
    base_url = "https://graph.facebook.com/v19.0"
    scope: ClassVar = ["email"]

    async def get_discovery_document(self) -> DiscoveryDocument:
        """Get document containing handy urls."""
        return {
            "authorization_endpoint": "https://www.facebook.com/v9.0/dialog/oauth",
            "token_endpoint": f"{self.base_url}/oauth/access_token",
            "userinfo_endpoint": f"{self.base_url}/me?fields=id,name,email,first_name,last_name,picture",
        }

    async def openid_from_response(self, response: dict, session: Optional["httpx.AsyncClient"] = None) -> OpenID:
        """Return OpenID from user information provided by Facebook."""

        return OpenID(
            email=response.get("email"),
            first_name=response.get("first_name"),
            last_name=response.get("last_name"),
            display_name=response.get("name"),
            provider=self.provider,
            id=response.get("id"),
            picture=response.get("picture", {}).get("data", {}).get("url", None),
        )