"""Force calibration coefficients and plot defaults from Orisys viewer2d."""

from __future__ import annotations

# Linear FN → Newtons (y = mx + c), from orisys examples/gui/sensors/adapter.py.
NORMAL_FORCE_CAL_SLOPE = 3.92685554668795e-05
NORMAL_FORCE_CAL_OFFSET = 0.0217596967278535

# PyQtGraph force-curve tuning from examples/gui/viewer2d/backend.py.
FORCE_SAMPLE_RATE_HZ = 30.0
PLOT_BUFFER_POINTS = 120
PLOT_WINDOW_SEC = PLOT_BUFFER_POINTS / FORCE_SAMPLE_RATE_HZ
Y_AXIS_MIN_SPAN = 20000.0
CALIBRATED_NORMAL_FORCE_Y_MIN = 0.0
CALIBRATED_NORMAL_FORCE_Y_MAX = 20.0
CALIBRATED_SHEAR_FORCE_Y_MIN = -20.0
CALIBRATED_SHEAR_FORCE_Y_MAX = 20.0
Y_RANGE_ALPHA = 0.5
LOWPASS_CUTOFF_HZ = 10.0


def calibrate_normal_force(raw_value: float) -> float:
    """Convert raw normal-force reading to Newtons using y = mx + c."""
    return NORMAL_FORCE_CAL_SLOPE * float(raw_value) + NORMAL_FORCE_CAL_OFFSET