"""Virtual seat posture calibration shared by planning and state handling."""

from __future__ import annotations

from dataclasses import dataclass


@dataclass(frozen=True)
class AngleCalibration:
    axis: str
    minimum_deg: float
    maximum_deg: float


ANGLE_CALIBRATIONS = {
    "seat.set_backrest_recline": AngleCalibration(
        axis="backrest_recline",
        minimum_deg=95,
        maximum_deg=163,
    ),
    "seat.set_legrest_height": AngleCalibration(
        axis="legrest_height",
        minimum_deg=95,
        maximum_deg=167,
    ),
}
AXIS_ANGLE_CALIBRATIONS = {
    calibration.axis: calibration for calibration in ANGLE_CALIBRATIONS.values()
}


def angle_to_position_pct(capability: str, angle_deg: float) -> int:
    calibration = ANGLE_CALIBRATIONS[capability]
    normalized = (
        (float(angle_deg) - calibration.minimum_deg)
        / (calibration.maximum_deg - calibration.minimum_deg)
    )
    return round(normalized * 100)


def position_pct_to_angle(axis: str, position_pct: float) -> float | None:
    calibration = AXIS_ANGLE_CALIBRATIONS.get(axis)
    if calibration is None:
        return None
    return round(
        calibration.minimum_deg
        + (calibration.maximum_deg - calibration.minimum_deg)
        * float(position_pct)
        / 100,
        1,
    )