import os


class Config:
    def __init__(self):
        self.config = {}
        self._set_defaults()

    def _set_defaults(self):
        if "XDG_DATA_HOME" in os.environ:
            datadir = os.environ["XDG_DATA_HOME"]
        elif os.path.isdir(os.environ["HOME"] + "/.local/share"):
            datadir = os.environ["HOME"] + "/.local/share"
        else:
            datadir = os.environ["HOME"] + "/.fenen"
        if not os.path.isdir(datadir):
            os.mkdir(datadir)
        self.config["db"] = datadir + "/fenen.db"
        self.config["threads"] = 4
        self.config["browser"] = "firefox"
        self.config["pager"] = "less"
        self.config["downloader"] = "curl -O"

    def parse_config(self):
        if "XDG_CONFIG_HOME" in os.environ and os.path.isfile(
            os.environ["XDG_CONFIG_HOME"] + "/fenen.conf"
        ):
            configfile = os.environ["XDG_CONFIG_HOME"] + "/fenen.conf"
        elif os.path.isfile(os.environ["HOME"] + "/.config/fenen.conf"):
            configfile = os.environ["HOME"] + "/.config/fenen.conf"
        elif os.path.isfile(os.environ["HOME"] + "/.fenen/fenen.conf"):
            configfile = os.environ["HOME"] + "/.fenen/fenen.conf"
        else:
            return
        with open(configfile, "r") as f:
            for line in f:
                kv = list(map(str.strip, line.split("=", 1)))
                if kv[0] in self.config:
                    self.config[kv[0]] = kv[1]
                else:
                    print(f"Unknown config option: {kv[0]}")

    def get_value(self, key):
        return self.config[key] if key in self.config else None