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#!/usr/bin/env python

"""Bits and bytes related humanization."""
from __future__ import annotations

suffixes = {
    "decimal": (" kB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB"),
    "binary": (" KiB", " MiB", " GiB", " TiB", " PiB", " EiB", " ZiB", " YiB"),
    "gnu": "KMGTPEZY",
}


def naturalsize(
    value: float | str,
    binary: bool = False,
    gnu: bool = False,
    format: str = "%.1f",
) -> str:
    """Format a number of bytes like a human readable filesize (e.g. 10 kB).

    By default, decimal suffixes (kB, MB) are used.

    Non-GNU modes are compatible with jinja2's `filesizeformat` filter.

    Examples:
        ```pycon
        >>> naturalsize(3000000)
        '3.0 MB'
        >>> naturalsize(300, False, True)
        '300B'
        >>> naturalsize(3000, False, True)
        '2.9K'
        >>> naturalsize(3000, False, True, "%.3f")
        '2.930K'
        >>> naturalsize(3000, True)
        '2.9 KiB'
        >>> naturalsize(10**28)
        '10000.0 YB'
        >>> naturalsize(-4096, True)
        '-4.0 KiB'

        ```

    Args:
        value (int, float, str): Integer to convert.
        binary (bool): If `True`, uses binary suffixes (KiB, MiB) with base
            2<sup>10</sup> instead of 10<sup>3</sup>.
        gnu (bool): If `True`, the binary argument is ignored and GNU-style
            (`ls -sh` style) prefixes are used (K, M) with the 2**10 definition.
        format (str): Custom formatter.

    Returns:
        str: Human readable representation of a filesize.
    """
    if gnu:
        suffix = suffixes["gnu"]
    elif binary:
        suffix = suffixes["binary"]
    else:
        suffix = suffixes["decimal"]

    base = 1024 if (gnu or binary) else 1000
    bytes_ = float(value)
    abs_bytes = abs(bytes_)

    if abs_bytes == 1 and not gnu:
        return "%d Byte" % bytes_

    if abs_bytes < base and not gnu:
        return "%d Bytes" % bytes_

    if abs_bytes < base and gnu:
        return "%dB" % bytes_

    for i, s in enumerate(suffix):
        unit = base ** (i + 2)

        if abs_bytes < unit:
            break

    ret: str = format % (base * bytes_ / unit) + s
    return ret