import sys

if sys.version_info<(3,0,0):
	from ConfigParser import ConfigParser
else:
	from configparser import ConfigParser

class Config:
	# Attributes
	filename = "settings.cfg"

	defaults = {
		'serial': {
			'device':   '/dev/ttyACM0',
			'baudrate': '921600',
			'parity':   'N',
			'databits': '8',
			'stopbits': '1',
		},
		'xively': {
			'feedid':   '<feedid>',
			'apikey':   '<apikey>',
			'maxrate':  '10',
		},
		'enable': {
			'acc':      True,
			'mag':      True,
			'lgt':      True,
			'tch':      True,
			'a2d':      True,
		},
		'rate': {
			'acc':      1,
			'mag':      1,
			'lgt':      1,
			'tch':      1,
			'a2d':      1,
		},
	}

	# Constructor
	def __init__(self):
		self.enable = {}
		self.rate   = {}
		self.parser = ConfigParser()
		self.parser.add_section('serial')
		self.parser.add_section('xively')
		self.parser.add_section('enable')
		self.parser.add_section('rate')
		self.load()

	# Methods
	def load(self):
		def get(sect, name):
			if self.parser.has_option(sect, name):
				return self.parser.get(sect, name)
			else:
				return self.defaults[sect][name]
		def bin(val):
			return val == True or val == 'True'

		self.parser.read(self.filename)

		self.device   =       get('serial', 'device')
		self.baudrate =   int(get('serial', 'baudrate'))
		self.parity   =       get('serial', 'parity')
		self.databits =   int(get('serial', 'databits'))
		self.stopbits =   int(get('serial', 'stopbits'))

		self.feedid   =       get('xively', 'feedid')
		self.apikey   =       get('xively', 'apikey')
		self.maxrate  = float(get('xively', 'maxrate'))

		for key in list(self.defaults['enable'].keys()):
			self.enable[key] =   bin(get('enable', key))
			self.rate[key]   = float(get('rate',   key))

	def save(self):
		self.parser.set('serial', 'device',           self.device)
		self.parser.set('serial', 'baudrate', str(int(self.baudrate)))
		self.parser.set('serial', 'parity',           self.parity)
		self.parser.set('serial', 'databits', str(int(self.databits)))
		self.parser.set('serial', 'stopbits', str(int(self.stopbits)))

		self.parser.set('xively', 'feedid',             self.feedid)
		self.parser.set('xively', 'apikey',             self.apikey)
		self.parser.set('xively', 'maxrate',  str(float(self.maxrate)))

		for key in self.defaults['enable'].keys():
			self.parser.set('enable', key, str( bool(self.enable[key])))
			self.parser.set('rate',   key, str(float(self.rate[key])))

		with open(self.filename, 'w') as fd:
			self.parser.write(fd)