import math
from app.schemas.rides import Coordinate


async def google_directions(pickup: Coordinate, dropoff: Coordinate) -> tuple[float, float]:
    # TODO: replace with real Google Directions API call (needs httpx + GOOGLE_MAPS_KEY).
    distance_km = _haversine_km(pickup.lat, pickup.lng, dropoff.lat, dropoff.lng)
    duration_min = (distance_km / 30.0) * 60.0
    return round(distance_km, 2), round(duration_min, 1)


def _haversine_km(lat1: float, lng1: float, lat2: float, lng2: float) -> float:
    R = 6371.0
    p1, p2 = math.radians(lat1), math.radians(lat2)
    dp = math.radians(lat2 - lat1)
    dl = math.radians(lng2 - lng1)
    a = math.sin(dp / 2) ** 2 + math.cos(p1) * math.cos(p2) * math.sin(dl / 2) ** 2
    return 2 * R * math.asin(math.sqrt(a))