import pandas as pd


STATE_COLUMNS = [
    "q_UF", "temp", "TMP", "R",
    "nuK", "slope", "power", "ceb_removal"
]


def build_chem_cycle_state(df: pd.DataFrame) -> pd.DataFrame:
    """
    从【物理周期层级】数据中构造
    【化学周期层级】的 RL 状态。
    """
    grouped = df.groupby(["unit_id", "chem_cycle_id"])

    state_df = pd.DataFrame({
        "q_UF": grouped["flow_mean"].mean(),
        "temp": grouped["temp_mean"].mean(),
        "TMP": grouped["tmp_start"].first(),
        "R": grouped["R_scaled_start"].first(),
        "nuK": grouped["cycle_nuK"].first(),
        "slope": grouped["cycle_long_a"].first(),
        "power": grouped["cycle_long_b"].first(),
        "ceb_removal": grouped["cycle_R_removed"].first(),
    })

    return state_df.reset_index(drop=True)