import configparser
import os
import sys

class Nitpo:

    def __init__(self):
        # # order is crucial here
        self.set_constants()
        self.read_config()

    def set_constants(self):
        """the location of the configuration file can not be changed"""
        c = {}
        home_dir = os.environ['HOME']
        etc_dir = home_dir + '/etc'
        conf_fufi = etc_dir + '/' + __name__ + '.ini'
        c['conf_fufi'] = conf_fufi
        c['tf'] = '%Y-%m-%dT%H:%M:%SZ'
        c['ns'] = 'http://nitpo.openlib.org'
        c['nsmap'] = {None: c['ns']}
        self.const = c

    def read_config(self):
        """reads the configuration"""
        conf_fufi = self.const['conf_fufi']
        if not os.path.isfile(conf_fufi):
            print("I need a file " + conf_fufi)
            sys.exit()
        config = configparser.ConfigParser()
        config.read(conf_fufi)
        self.conf = config
        return self.conf

    def check_conf(self, sect, subsect):
        if(sect not in self.conf):
            print(f"I need a section {sect} in the configuration.")
            sys.exit()
        if(subsect not in self.conf[sect]):
            print(f"I need a {subsect} in the [{sect}] configuration.")
            sys.exit()

    def has_conf(self, sect, subsect):
        if(sect not in self.conf):
            return False
        if(subsect not in self.conf[sect]):
            return False
        return True

    def is_dev(self):
        """I'm on my development machine if I have /etc/wpa_supplicant.conf"""
        if os.path.isfile('/etc/wpa_supplicant.conf'):
            return True
        return False