from json import JSONDecodeError, dumps, loads
from typing import Any

import darkdetect


def jsonLoad(filename):
    """Loads arg1 as json and returns its contents"""
    with open(filename, "r", encoding='utf8') as file:
        try:
            output = loads(file.read())
        except JSONDecodeError:
            raise
        except FileNotFoundError:
            raise
    return output

def jsonSave(contents, filename):
    """Dumps dict/list arg1 to file arg2"""
    try:
        with open(filename, "w", encoding='utf8') as file:
            file.write(dumps(contents, ensure_ascii=False, indent=4))
    except Exception as exp:
        raise
    return


def nested_set(dic, keys, value, create_missing=True):
    d = dic
    for key in keys[:-1]:
        if key in d:
            d = d[key]
        elif create_missing:
            d = d.setdefault(key, {})
        else:
            return dic
    if keys[-1] in d or create_missing:
        d[keys[-1]] = value
    return dic

def configSet(keys: list, value: Any, create_missing=True) -> None:
    """Set config's value to provided one

    ### Args:
        * keys (`list`): List of keys from the highest one to target.
        * value (`Any`): Needed value.
        * create_missing (`bool`, optional): Create missing items on the way. Defaults to True.
    """    
    this_dict = jsonLoad("config.json")
    this_dict = nested_set(this_dict, keys, value, create_missing=create_missing)
    jsonSave(this_dict, "config.json")
    return

def configGet(key: str, *args: str) -> Any:
    """Get value of the config key
    ### Args:
        * key (`str`): The last key of the keys path.
        * *args (`str`): Path to key like: dict[args][key].
    ### Returns:
        * any: Value of provided key
    """    
    try:
        this_dict = jsonLoad("config.json")
    except FileNotFoundError:
        print("Config file not found!", flush=True)
        exit()
    this_key = this_dict
    for dict_key in args:
        this_key = this_key[dict_key]
    return this_key[key]

def use_dark_mode() -> bool:
    """Return whether dark mode should be used

    ### Returns:
        * `bool`: True if yes and False if no
    """    

    if configGet("dark_mode_auto") is True:
        return bool(darkdetect.isDark())
    else:
        return configGet("dark_mode")