from functools import lru_cache

from fastapi import Depends, Request
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer

from app.core.config import get_settings
from app.core.contracts import RequestContext
from app.core.errors import UnauthorizedAgentError
from app.core.security import JwtAuthenticator
from app.service.identity_service import IdentityService
from app.service.risk_questionnaire_service import RiskQuestionnaireService

_bearer = HTTPBearer(auto_error=False)
TRACE_ID_HEADER = "X-Trace-ID"


@lru_cache(maxsize=1)
def _authenticator() -> JwtAuthenticator:
    return JwtAuthenticator(get_settings())


async def build_request_context(
    request: Request,
    credentials: HTTPAuthorizationCredentials | None = Depends(_bearer),  # noqa: B008
) -> RequestContext:
    request.state.trace_id = request.headers.get(TRACE_ID_HEADER)
    if credentials is None or credentials.scheme.lower() != "bearer":
        raise UnauthorizedAgentError("token is missing, invalid, or revoked")
    try:
        context = _authenticator().authenticate(credentials.credentials)
        context = await IdentityService().resolve(context)
    except Exception as exc:
        raise UnauthorizedAgentError("token is missing, invalid, or revoked") from exc
    request.state.request_context = context
    onboarding_path = request.url.path.startswith("/api/v1/onboarding/")
    if not onboarding_path and await RiskQuestionnaireService().is_required(context):
        from app.core.errors import OnboardingRequiredError

        raise OnboardingRequiredError("请先完成开户风险测评问卷")
    return context