import numpy as np
from converted_code.smartmean import smartmean

def smartstd(x, dim=None):
    """
    Python implementation of the MATLAB smartstd function.
    Calculates the standard deviation while ignoring NaN and Inf values.
    Uses N (not N-1) for normalization.
    
    Parameters:
    x (ndarray): Input array
    dim (int, optional): Dimension along which to compute the standard deviation
    
    Returns:
    ndarray: Standard deviation along the specified dimension, ignoring NaN/Inf
    """
    if isinstance(x, list):
        x = np.array(x)
    
    # If dimension is not specified, find the first non-singleton dimension
    if dim is None:
        # Find the first dimension with size > 1
        if len(x.shape) == 1:
            dim = 0
        else:
            non_singleton_dims = [i for i, size in enumerate(x.shape) if size > 1]
            dim = non_singleton_dims[0] if non_singleton_dims else 0
    
    # Compute mean along the specified dimension
    mean_x = smartmean(x, dim)
    
    # Create a tile for broadcasting mean back to original dimensions
    tile_shape = list(x.shape)
    tile_shape[dim] = 1
    
    # Reshape mean to be broadcastable
    broadcast_shape = [1] * len(x.shape)
    broadcast_shape[dim] = mean_x.shape[0] if dim == 0 else mean_x.shape[1]
    
    if dim == 0:
        mean_reshaped = mean_x.reshape(1, -1)
        x_centered = x - np.tile(mean_reshaped, (x.shape[0], 1))
    elif dim == 1:
        mean_reshaped = mean_x.reshape(-1, 1)
        x_centered = x - np.tile(mean_reshaped, (1, x.shape[1]))
    else:
        # For higher dimensions - this might need more complex handling
        raise ValueError("Dimensions higher than 2 not fully supported yet")
    
    # Get finite mask
    mask = np.isfinite(x)
    
    # Zero out non-finite values in centered data
    x_centered = np.where(mask, x_centered, 0)
    
    # Square the differences
    squared_diff = np.square(x_centered)
    
    # Compute the mean of squares (using N, not N-1)
    result = np.sqrt(smartmean(squared_diff, dim))
    
    return result