import datetime
from typing import List

from django.conf import settings
from django.utils import timezone
from pydantic import BaseModel, HttpUrl, validator
from spid_cie_oidc.entity.utils import datetime_from_timestamp


try:
    import spid_cie_oidc.entity.settings as entity_settings

    NOW = timezone.localtime()
    MAX_ACCEPTED_TIMEDIFF = getattr(
        settings, "MAX_ACCEPTED_TIMEDIFF", entity_settings.MAX_ACCEPTED_TIMEDIFF
    )
except ImportError: # pragma: no cover
    NOW = datetime.datetime.now()
    MAX_ACCEPTED_TIMEDIFF = 5


class JwtStructure(BaseModel):
    iss: HttpUrl
    sub: HttpUrl
    iat: int
    exp: int
    jti: str
    # TODO: migliorare: array di url con almeno uno
    aud: List[HttpUrl]

    @validator("exp")
    def validate_exp(cls, exp):
        now = int(NOW.timestamp())
        if exp <= now:
            raise ValueError("exp MUST be in the future")

    @validator("iat")
    def validate_iat(cls, iat):
        dt_iat = datetime_from_timestamp(iat)
        delta = datetime.timedelta(minutes=MAX_ACCEPTED_TIMEDIFF)
        if abs((NOW - dt_iat).total_seconds()) > delta.total_seconds():
            raise ValueError(f"iat MUST be in the last {MAX_ACCEPTED_TIMEDIFF} minutes")


class IdTokenJwt(JwtStructure):
    # TODO: implementare
    pass


class AccessTokenJwt(JwtStructure):
    # TODO: implementare
    pass


class RefreshTokenJwt(JwtStructure):
    # TODO: implementare
    pass


class UserInfoResponseJwtHeader(BaseModel):
    # TODO: implementare
    pass


class UserInfoResponseJwtPayload(JwtStructure):
    # TODO: implementare
    pass