"""
Misc helper functions.
"""
import json
import os
import pathlib
import subprocess


# pylint: disable=too-few-public-methods
class Color(object):
    """Color formats."""
    def __init__(self, hex_color):
        self.hex_color = hex_color

    def __str__(self):
        return self.hex_color

    @property
    def rgb(self):
        """Convert a hex color to rgb."""
        return hex_to_rgb(self.hex_color)


def set_grey(colors):
    """Set a grey color based on brightness of color0."""
    return {
        0: "#666666",
        1: "#666666",
        2: "#757575",
        3: "#999999",
        4: "#999999",
        5: "#8a8a8a",
        6: "#a1a1a1",
        7: "#a1a1a1",
        8: "#a1a1a1",
        9: "#a1a1a1",
    }.get(int(colors[0][1]), colors[7])


def read_file(input_file):
    """Read colors from a file."""
    with open(input_file) as file:
        colors = file.read().splitlines()
    return colors


def read_file_json(input_file):
    """Read colors from a json file."""
    with open(input_file) as json_file:
        colors = json.load(json_file)
    return colors


def save_file(colors, export_file):
    """Write the colors to the file."""
    with open(export_file, "w") as file:
        file.write(colors)


def save_file_json(colors, export_file):
    """Write the colors to a json file."""
    with open(export_file, "w") as file:
        json.dump(colors, file, indent=4)


def create_dir(directory):
    """Alias to create the cache dir."""
    pathlib.Path(directory).mkdir(parents=True, exist_ok=True)


def hex_to_rgb(color):
    """Convert a hex color to rgb."""
    red, green, blue = list(bytes.fromhex(color.strip("#")))
    return f"{red},{green},{blue}"


def disown(*cmd):
    """Call a system command in the background,
       disown it and hide it's output."""
    subprocess.Popen(["nohup"] + list(cmd),
                     stdout=subprocess.DEVNULL,
                     stderr=subprocess.DEVNULL,
                     preexec_fn=os.setpgrp)