from .util import validate_url, validate_list
from os import getcwd, path
from typing import List
import json

CONFIG_FILE = "ups.json"


class config:
    def __init__(self, dir="") -> None:
        if dir == "":
            dir = getcwd()

        self.path = path.join(dir, CONFIG_FILE)
        self.conf = {}

        self.load()

    # load the configuration from the file
    def load(self) -> None:
        try:
            f = open(self.path, "r")
            content = f.read()
            f.close()
        except Exception as e:
            raise Exception("failed to read config: %s" % e)
        else:
            self.conf = json.loads(content)
            f.close()

    # save the current configuration
    def save(self) -> None:
        content = json.dumps(self.conf, indent=2)

        try:
            f = open(self.path, "w")
            f.write(content)
            f.close()
        except Exception as e:
            raise Exception("failed to save config: %s" % e)

    # set a URL key in the configuration
    def set_url(self, key: str, val: str) -> None:
        if not validate_url(val):
            raise Exception("expected a valid URL for %s" % key)

        self.conf[key] = val
        self.save()

    # set a string key in the configuration
    def set_str(self, key: str, val: str) -> None:
        if val == "" or val is None:
            raise Exception("expected a non-empty string for %s" % key)

        self.conf[key] = val
        self.save()

    def set_list(self, key: str, val: List[str]) -> None:
        if not validate_list(val):
            raise Exception("expected a non-empty list for %s" % key)

        self.conf[key] = val
        self.save()

    # read a URL key from the configuration
    def url(self, key: str) -> str:
        if key not in self.conf.keys() or not validate_url(self.conf[key]):
            return ""
        return self.conf[key]

    # read a string key from the configuration file
    def str(self, key: str) -> str:
        if key not in self.conf.keys():
            return ""
        return self.conf[key]

    # read a list from the configuration file
    def list(self, key: str) -> List[str]:
        if key not in self.conf.keys() or not validate_list(self.conf[key]):
            return []
        return self.conf[key]