import httpx
from .objects import *


class SNCFException(Exception):
    pass


class SNCF:
    BASE_URL = "https://api.sncf.com/v1/coverage/sncf"

    def __init__(self, token: str):
        self.token = token
        self.source_stop_point: str = ""
        self.dest_stop_point: str = ""
        self.allowed_lines: list[str] = []
        self.max_transfers: int = 0
        self.max_duration_secs: int = 1800
        self.prefered_date_format = "%H:%M"
        self.token_validated: bool = False
        self.physical_mode: Optional[PhysicalMode] = None

    def set_source_stop_point(self, stop_point: str):
        self.source_stop_point = stop_point

    def set_dest_stop_point(self, stop_point: str):
        self.dest_stop_point = stop_point

    def set_allowed_lines(self, allowed_lines: list[str]):
        self.allowed_lines = allowed_lines

    async def get_next_journeys(self, max_count: int = 1):
        if not self.physical_mode:
            raise SNCFException("Use set_physical_mode before using this function")
        valid_journeys: List[Journey] = []
        api_response = await self.api_request(f"/journeys?from={self.source_stop_point}:{self.physical_mode}&to={self.dest_stop_point}:{self.physical_mode}&datetime={self.date_now()}&count={max_count}&disable_geojson=true")
        journeys = api_response["journeys"]
        for journey in journeys:
            if (self.max_transfers == -1 or journey["nb_transfers"] <= self.max_transfers) and (self.max_duration_secs == -1 or journey["duration"] <= self.max_duration_secs):
                valid_journeys.append(Journey(**journey))
        return valid_journeys

    async def api_request(self, url: str, **kwargs):
        async with httpx.AsyncClient() as client:
            if not kwargs.get("no_check", False) and not self.token_validated:
                if not await self.test_api_key():
                    raise Exception("Token is invalid")
                self.token_validated = True
            req = await client.get(SNCF.BASE_URL + url, headers={"Authorization": self.token})
            req.raise_for_status()
            json = req.json()
            return json

    @staticmethod
    def date_now() -> str:
        return datetime.datetime.now().strftime("%Y%m%dT%H%M%S")

    @staticmethod
    def api_date_to_datetime(api_date: str) -> datetime:
        return datetime.datetime.strptime(api_date, "%Y%m%dT%H%M%S")

    async def test_api_key(self) -> bool:
        try:
            await self.api_request("", no_check=True)
            return True
        except httpx.RequestError:
            return False

    def get_cheapest_path(self) -> List[Journey]:
        pass

    def set_physical_mode(self, physical_mode: PhysicalModes):
        self.physical_mode = physical_mode

    async def get_station(self, name: str) -> List[StopArea]:
        api_response = await self.api_request(f"/places?q={name}&disable_geojson=true&type=stop_area&depth=2")
        places = [Place(**item) for item in api_response["places"]]
        stops = []
        for place in places:
            if place.stop_area:
                if self.physical_mode:
                    for physical_mode in place.stop_area.physical_modes:
                        if self.physical_mode == physical_mode.value:
                            stops.append(place.stop_area)
                else:
                    stops.append(place.stop_area)
        return stops