import logging
import sys

try:
    from weconnect import weconnect
except ImportError:
    print("weconnect is not installed.  Run:  pip install weconnect", file=sys.stderr)
    sys.exit(1)

log = logging.getLogger(__name__)


def connect(username: str, password: str):
    wc = weconnect.WeConnect(
        username=username,
        password=password,
        updateAfterLogin=False,
        loginOnInit=True,
    )
    wc.login()
    wc.update()
    return wc


def select_vehicle(wc, vin: str | None):
    """Return (vehicle, error_message). error_message is None on success."""
    vehicles = list(wc.vehicles.values())
    if not vehicles:
        return None, "No vehicles found in this WeConnect account"
    if vin:
        vehicle = next((v for v in vehicles if v.vin.value == vin), None)
        if not vehicle:
            available = [v.vin.value for v in vehicles]
            return None, f"VIN {vin} not found.  Available: {available}"
        return vehicle, None
    return vehicles[0], None