#!/usr/bin/env python

class Package:

	_com_pad = 40;

	# (1) Constructs a new package
	#
	# @name<String>				Package name
	# @state<char>				Package state ('x', ' ', '.')
	# @com<String>				Package comm (default: None)
	# @ppa<(String, String)>	Package ppa (default: None)
	# @deb<Path>				Path to local deb file (if deb) (default: None)
	# @pad<int>					Number of pad spaces (default: 2)
	#
	#--------------------------------------------------------#
	def __init__(self, name=None, sta=None, com=None, ppa=None, deb=False, pad=2):
		# (1) Arguments check
		#--------------------------------------------------------#
		# (1) Is name set #
		if( name == None ):
			raise Exception('Missing argument "name" !');

		# (2) deb set but not a bool #
		if( not isinstance(deb, bool) ):
			raise Exception('Argument "deb" must be a boolean !');

		# (3) Check pad is (+) int #
		try:
			pad = int(pad);

			if( pad < 0 ):
				raise Exception('Argument "pad" must be a positive integer !');

		except ValueError:
			raise Exception('Argument "pad" must be a positive integer !');

		# (4) Check state #
		if( sta != 'x' and sta != '.' and sta != ' ' ):
			raise Exception('Argument "sta" is invalid or missing !');



		# (2) Set attributes
		#--------------------------------------------------------#
		self._name = name;
		self._sta  = sta;
		self._com  = com;
		self._ppa  = "%s/%s" % (ppa[0], ppa[1]) if ppa != None else None;
		self._deb  = deb;
		self._pad  = pad;



	# (2) Getters
	def getName(self):
		return self._name;

	def getDeb(self):
		return self._deb;

	def getPpa(self):
		return self._ppa;

	def getPad(self):
		return self._pad;

	def getCom(self):
		return self._com;

	def isInstalled(self):
		return self._sta == 'x';

	def isRemoved(self):
		return self._sta == '.';

	def isPurged(self):
		return self._sta == ' ';



	def install(self):
		self._sta = 'x';

	def remove(self):
		self._sta = '.';

	def purge(self):
		self._sta = ' ';


	# (3) Serialize
	#
	#--------------------------------------------------------#
	def serialize(self):
		raw = '%s[%s] %s' % ( ' '*self._pad, self._sta, self._name);

		if( self._ppa != None ):
			raw += ' [%s]' % self._ppa;
		elif( self._deb ):
			raw += ' [deb]';

		if( self._com != None ):
			raw += ' ' * (self._com_pad - len(raw));
			raw += '# %s' % self._com;

		return raw;