import os.path
import yaml


NAME = "phi"

CONFIG_FILE = "config.yml"
CONFIG_PATHS = [
    "./",
    "~/.config/" + NAME + "/",
    "/usr/local/etc/" + NAME + "/",
    "/etc/" + NAME + "/",
]
CONFIG_FILES = [os.path.join(p, CONFIG_FILE) for p in CONFIG_PATHS]


def get_config(custom_config=None):
    """Return the path of the found configuration file and its content

    :returns: (path, config)
    :rtype: (str, dict)
    """
    if custom_config:
        global CONFIG_FILES
        CONFIG_FILES = [custom_config]

    for f in CONFIG_FILES:
        try:
            with open(f, "r") as c:
                config = yaml.safe_load(c)
                return (f, config)
        except FileNotFoundError:
            # Skip to the next file.
            # We only care if the file is preset but it's not
            # accessible or if the file is not present at all
            # in any of CONFIG_PATHS.
            pass
    else:
        if custom_config:
            raise FileNotFoundError("Config file {} not found.".format(custom_config))
        else:
            raise FileNotFoundError(
                "Could not find {} in any of {}.".format(
                    CONFIG_FILE, ", ".join(CONFIG_PATHS)
                )
            )