#!/usr/bin/env python
# -*- coding: utf-8; -*-
"""
* Copyright 2014 Alexandre Possebom
* Copyright 2014 Red Dye No. 2
* Copyright (C) 2011-2013 TG Byte Software GmbH
* Copyright (C) 2009-2011 Thilo-Alexander Ginkel.
* Copyright (C) 2010-2014 Eric Woodruff
* Copyright (C) 2006-2010 Steve Cooper

This file is part of twik.

Twik is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Twik is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Twik.  If not, see <http://www.gnu.org/licenses/>.
"""

import configparser
import os.path
import sys
from random import SystemRandom

def privatekeygenerator():
	"""
	Generate new private key
	"""
	subgroups_length = [8, 4, 4, 4, 12]
	subgroup_separator = '-'
	allowed_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	systemrandom = SystemRandom()
	allowedcharslength = len(allowed_chars)
	key = ""
	for i in range(0, len(subgroups_length)):
		for j in range(0, subgroups_length[i]):
			key += allowed_chars[systemrandom.randrange(allowedcharslength)]
		if i < (len(subgroups_length) -1):
			key += subgroup_separator
	return key

class Util(object):
	"""
	Class for deal with config file
	"""
	def __init__(self, tag, chars, pass_type, profile):
		"""
		Constructor
		"""
		homedir = os.path.expanduser('~')
		self.filename = os.path.join(homedir, '.twik.conf')
		self.config = configparser.ConfigParser()
		self.config.read(self.filename)
		self.tag = tag
		self.chars = chars
		self.profile = profile
		self.pass_type = pass_type
		#Initialize default values
		self.get_privatekey()

	def writeconfig(self):
		"""
		Write config file
		"""
		with open(self.filename, 'w+') as fileconfig:
			self.config.write(fileconfig)

	def get_privatekey(self):
		"""
		Get private key if not exists create new one
		"""
		private_key = ''
		if self.profile == None and len(self.config.sections()) > 0:
			for session in self.config.sections():
				if self.config.has_option(session, 'default') and self.config.getboolean(session, 'default') == True:
					self.profile = session
					break
			if self.profile == None:
				self.profile = self.config.sections()[0]
			print(f'Using profile: {self.profile}', file=sys.stderr)

		if self.profile and self.config.has_option(self.profile, 'private_key'):
			private_key = self.config.get(self.profile, 'private_key')
		else:
			private_key = privatekeygenerator()
			if self.profile == None:
				self.profile = 'Personal'
			self.config.add_section(self.profile)
			self.config.set(self.profile, 'private_key', private_key)
			chars = self.chars
			if chars == None:
				chars = 12
			pass_type = self.pass_type
			if pass_type == None:
				pass_type = 1
			self.config.set(self.profile, 'chars', chars)
			self.config.set(self.profile, 'password_type', pass_type)
			if self.profile == 'Personal':
				self.config.set(self.profile, 'default', 1)
			self.writeconfig()
			print('New profile is generated')
			self.config.read(self.filename)
		return private_key

	def get_chars(self):
		config_key = f'{self.tag}_chars'

		if self.config.has_option(self.profile, config_key) and self.chars == None:
			self.chars = self.config.getint(self.profile, config_key)
		else:
			if self.chars == None and self.config.has_option(self.profile, 'chars'):
				self.chars = self.config.getint(self.profile, 'chars')
			self.config.set(self.profile, config_key, str(self.chars))
			self.writeconfig()

		if self.chars < 4 or self.chars > 26:
			print('invalid password length value from configuration using default')
			self.chars = 12

		return self.chars

	def get_passord_type(self):
		config_key = f'{self.tag}_password_type'

		if self.config.has_option(self.profile, config_key) and self.pass_type == None:
			self.pass_type = self.config.getint(self.profile, config_key)
		else:
			if self.pass_type == None and self.config.has_option(self.profile, 'password_type'):
				self.pass_type = self.config.getint(self.profile, 'password_type')

			self.config.set(self.profile, config_key, str(self.pass_type))
			self.writeconfig()

		if self.pass_type < 1 or self.pass_type > 3:
			print('invalid password type value from configuration using default')
			self.pass_type = 1

		return self.pass_type

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