# -*- coding: utf-8 -*-
import argparse
import sys
import os
import math

class Config:
    def __init__(self, **kwargs):
        for arg in kwargs:
            setattr(self, arg, kwargs[arg])

config = Config(yml_file="config.yml")

def path():
    if getattr(sys, 'frozen', False):
        return sys._MEIPASS + "/"
    else:
        path = os.path.dirname(os.path.realpath(__file__))
        return path + "/../"

def parse_args():
    argv = sys.argv[1:]
    sys.argv = sys.argv[:1]
    if "--" in argv:
        index = argv.index("--")
        kivy_args = argv[index+1:]
        argv = argv[:index]

        sys.argv.extend(kivy_args)

    parser = argparse.ArgumentParser(description="A Music Sampler application.")
    parser.add_argument("-c", "--config",
            default="config.yml",
            required=False,
            help="Config file to load")
    parser.add_argument("-V", "--version",
            action="version",
            help="Displays the current version and exits. Only use in bundled package",
            version=show_version())
    parser.add_argument('--',
            dest="args",
            help="Kivy arguments. All arguments after this are interpreted by Kivy. Pass \"-- --help\" to get Kivy's usage.")
    args = parser.parse_args(argv)

    config.yml_file = args.config

def show_version():
    if getattr(sys, 'frozen', False):
        with open(path() + ".pyinstaller_commit", "r") as f:
            return f.read()
    else:
        return "option '-v' can only be used in bundled package"

def yml_file():
    return config.yml_file

def duration_to_min_sec(duration):
    minutes = int(duration / 60)
    seconds = int(duration) % 60
    if minutes < 100:
        return "{:2}:{:0>2}".format(minutes, seconds)
    else:
        return "{}:{:0>2}".format(minutes, seconds)

def gain(volume, old_volume = None):
    if old_volume is None:
        return 20 * math.log10(volume / 100)
    else:
        return [20 * math.log10(max(volume, 0.1) / max(old_volume, 0.1)), max(volume, 0)]