"""斐波计算（自 crypto_monitor 复制，期货共用）。"""

def calc_fib_plan(direction, upper, lower, ratio):
    try:
        h = float(upper)
        l = float(lower)
        r = float(ratio)
    except (TypeError, ValueError):
        return None
    if h <= l or r <= 0 or r >= 1:
        return None
    span = h - l
    direction = (direction or "long").strip().lower()
    if direction == "short":
        entry = l + r * span
        return entry, h, l
    entry = h - r * span
    return entry, l, h