#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2011 Sebastian Pipping <sebastian@pipping.org>
# Licensed under GPL v3 or later

from __future__ import print_function
import sys
import ConfigParser


_SECTION = 'client-barcode'

_KEYS = (
	# Key, type, default
	('CLIENT_DEBUG', bool, False),  # Should go first to enable debugging as early as possible
	('SERVER_URL', str, None),
	('SERVER_USER', str, None),
	('SERVER_PASSWORD', str, None),
)

_DEFAULTS = dict([(key, str(default))
	for (key, _type, default)
	in _KEYS
	if default is not None])


class Settings:
	def __init__(self):
		pass

	def load(self, filename, _additional_keys=None):
		additional_keys = () if _additional_keys is None else _additional_keys

		cp = ConfigParser.ConfigParser(_DEFAULTS)
		if not cp.read(filename):
			print('FATAL: Config file "%s" could not be parsed.' % (filename), file=sys.stderr)
			return False

		valid = True
		for key, _type, dummy in _KEYS + additional_keys:
			try:
				if _type is bool:
					value = cp.getboolean(_SECTION, key)
				else:
					value = cp.get(_SECTION, key)
			except ValueError:
				print('ERROR: Key "%s" in config file "%s" must be of type "%s".' \
						% (key, filename, _type.__name__), file=sys.stderr)
				valid = False
			except ConfigParser.NoOptionError:
				print('ERROR: Config file "%s" misses required key "%s.%s".' \
						% (filename, _SECTION, key), file=sys.stderr)
				valid = False
			else:
				setattr(self, key, value)
				if self.CLIENT_DEBUG:
					print('DEBUG: CONFIG: %s.%s=%s("%s")' % (_SECTION, key, type(value).__name__, value))

		return valid


settings = Settings()