import os
from pathlib import Path

STATE_PATH = Path(os.environ.get("STATE_PATH", "/data/monitor_state.json"))
CPS_LOG_PATH = Path(os.environ.get("CPS_LOG_PATH", "/data/cps_log.jsonl"))
BACKGROUND_PATH = Path(os.environ.get("BACKGROUND_PATH", "/data/background_24h.npy"))
BACKGROUND_SNAPSHOT_PATH = Path(os.environ.get("BACKGROUND_SNAPSHOT_PATH", "/data/background_snapshot.json"))
LOG_DIR = Path(os.environ.get("LOG_DIR", "/logs"))
ISOTOPE_INDEX_PATH = Path(os.environ.get("ISOTOPE_INDEX_PATH", "/models/vega_isotope_index.txt"))

ENERGY_OFFSET = float(os.environ.get("ENERGY_CALIBRATION_OFFSET", "0.33"))
ENERGY_SLOPE = float(os.environ.get("ENERGY_CALIBRATION_SLOPE", "2.97"))
NUM_CHANNELS = 1023  # Last channel (1023) is overflow bin, excluded from display


def energy_axis():
    """Generate energy axis in keV from channel numbers."""
    return [round(ENERGY_OFFSET + ENERGY_SLOPE * i, 2) for i in range(NUM_CHANNELS)]