#!/usr/bin/env python
# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Universal Select Tool
# Uselect Modules/Actions Module
# umodule.py mephx.x@gmail.com

import re
import os
#import pdb

from uio import Counter
from uio import filesystem
from uio import printsystem




modules_dir = '/usr/share/uselect/modules/'

class Action:
	
	def __init__(self, name = None, lines = None, description = None, type = None):
	
		self.description = description
		self.name = name
		self.output = []
		self.usage = []
		self.options = []
		self.type = type
		
		if type == 'runnable':
			self.__class__ = Runnable
		elif type == 'env':
			self.__class__ = Env
		elif type == 'sym':
			if filesystem.uid != 'root':
				self.__class__ = Path
			else:
				self.__class__ = Sym
		elif type == 'profile':
			self.__class__ = ProfileAction
		else:
			raise UserWarning('Action "' + name + '" has no type set!') 

		self.setup()

class Runnable(Action):
	
	def do_action(self, args):
		if len(args) != 0:
			path = '/tmp/' + self.name
			filesystem.write_file(path, self.code)
			filesystem.make_exec_file(path)
			for line in filesystem.execute_cmd(path,args).readlines():
				self.output.append(line[:-1])
			filesystem.delete_file(path)
	
	def add_parameter(self, parameter):
		"""
		Adds Usage Parameters.
		"""
		self.parameters.append(parameter)
		
	def add_usage(self, usage):
		"""
		Adds Usage Code.
		"""
		usage = usage.split('\n')
		args = []
		path = '/tmp/' + self.name
		filesystem.write_file(path, usage)
		filesystem.make_exec_file(path)
		for line in filesystem.execute_cmd(path,args):
			self.usage.append(line[:-1])
		filesystem.delete_file(path)

	def add_code(self, lines = None):
		"""
		Add Code.
		"""
		lines = lines.split('\n')
		self.code = lines	
		
	def setup(self):
		self.code = []
		self.parameters = []
		self.usage = []
		
	def build(self):

		return

				
class Link:
	
	def add_link(self, link = None):
		"""
		Add a sub-link.
		"""
		self.links.append(link)
		link.parent = self

	def __init__(self, lines = None, alias = None, target = None, prefix = None, regexp = None, sufix = ''):
		
		self.alias = alias
		self.target = prefix + alias
		self.prefix = prefix
		self.sufix = sufix
		self.regexp = regexp
		self.targets = []
		self.status = []
		self.links = []
		self.destination = self.prefix + self.alias

	
	def get_links(self, counter = None):
		"""
		Builds a nested list with the Link's hierarchy.
		"""
		links = []
		target = []
		if self.links == []:
			return
		for link in self.links:
			if len(link.targets) == 0:
				raise UserWarning('Link "' + link.alias \
						+ '" has no targets!')
			for i in range(len(link.targets)):
				target.append([counter.count, link, i])
				counter.count += 1
				sub_links = link.get_links(counter)
				if sub_links != None:
					target.append(sub_links)
			links.append(target)
		return links

	def build(self):
		for link in self.links:
			link.build()
		for dir in filesystem.list_dir(self.prefix):
			match = re.match(self.regexp, dir)
			if match:
				source = self.prefix + match.group(0) + self.sufix
				self.targets.append(source)
				if filesystem.path_exists(self.destination):
					if filesystem.real_path(self.destination) == source:
						self.status.append('ok')
					else:
						self.status.append('warning')
					if filesystem.real_path( \
						filesystem.environment + 'bin/' + self.alias) == \
						source:
						status = self.status.pop()
						status += ' + space + notice'
						self.status.append(status)
							
				else:
					self.status.append('error')
		return

class Sym(Action):
	
	def build_options(self, links):
		"""
		Builds available options for PrintSystem.
		"""
		options = []
		for link in links:
			if link == []:
				options.append([0, 'No Targets Found!', 'error'])
			elif isinstance(link, list) and not isinstance(link[0], int):
				options.append(self.build_options(link))
			else:
				count = link[0]
				i = link[2]
				link = link[1]
				options.append([count, link.targets[i], link.status[i]])
		return options
				
	
	def get_targets(self, links, option = None, target = None, family = None):
		"""
		Builds a nested list of targets.
		"""

		parent = None
		for link in links:
			if isinstance(link, list) and not isinstance(link[0], int):
				if self.get_targets(link, option = option, family = family, target = target):
					if target == None:
						if parent != None:
							family.append(parent)
					return family
				else:
					del family[:]
			elif isinstance(link, list) and isinstance(link[0], int):
				if option == None:

					if link[1].targets[link[2]] == target:
						family.append(link)
						return True
					else:
						parent = link
				else:
					if option == link[0]:
						family.append(link)
						return True
					else:
						parent = link
								
	def do_action(self, args):
		"""
		Implementation of do_action() for Sym.
		"""
		links = []
		
		counter = Counter()
		
		for link in self.links:
			target = []
			if len(link.targets) == 0:
				raise UserWarning('Link "' + link.alias \
						+ '" has no targets!')
			for i in range(len(link.targets)):
				target.append([counter.count, link,i])
				counter.count +=1
				sub_links = link.get_links(counter)
				if sub_links != None:
					target.append(sub_links)
			links.append(target)
		
		self.options = self.build_options(links)
		
		
		if len(args) != 0:
			if len(args) >= 1:
				for arg in args:
					try:
						option = int(arg)
						target = None
					except ValueError:
						option = None
						target = arg
					targets =  self.get_targets(links, option = option, target = target, family = [])
					if targets != None:
						for target in targets:
							self.do_target(target)
					else:					
						raise UserWarning('Invalid Option "' + args[0] \
							+ '"!')
		else:
			self.parameters = ['<target>','...','<target>']
			self.usage.append('Available ' + self.name + ' targets:' )
	
	def do_target(self, target, clear = False):
		"""
		Activate/Deactivate a target.
		"""
		i = target[2]
		link = target[1]
		if clear:
			filesystem.delete_file(link.destination)
			self.output.append('Unsetting ' + link.destination\
			+ ' success!')
		else:
			filesystem.create_symlink(link.targets[i], \
				link.destination)
			self.output.append('Setting ' + link.targets[i]\
				+ ' success!')
			
	def add_link(self, link = None):
		"""
		Add sub-link.
		"""
		self.links.append(link)
	def setup(self):

		self.links = []
								
	def build(self):
		self.parameters = ['<target>', '(...)', '<target>']
		for link in self.links:
			link.build()


class Var():
	def __init__(self, var, filesystem):
		filesystem = filesystem
		self.name = var
		self.values = []
		
	def add_values(self, values, separator = ':', active = True):
		"""
		Parses a line of values and adds the values.
		"""
		values = values.split(separator)
		for value in values:
			self.add_value(value, active)
		
	def add_value(self, value, active = False):
		"""
		Add a value.
		"""
		self.values.append([value, active])
	
	def export(self):
		filesystem.set_env(self)
	
	def to_string(self, separator = ':'):
		"""
		Builds a line of values.
		"""
		string = ''
		for value in self.values:
			string += value + separator
		return string
			

class ProfileAction(Action):
	
	def do_action(self, args, modules):
		if args[0] == 'activate':
			filesystem.prepare_environment()
			self.output.append('Setting Folder Profile...')
			for module in modules:
				for action in module[1]:
					_action = module[0].get_action(action[0])
					_action.build()
					for arg in action[1]:
						args = str(arg).split(" ")

						_action.do_action(args)

					for line in _action.output:
						self.output.append(line)		
			
			self.output.append('Folder Profile Set!')
			
		elif args[0] == 'default':
			self.output.append('Default Profile Set!')
	def build(self):
		return
	def setup(self):
		return

class Env(Action):
	
	def do_action(self, args):
		for var in self.vars:
			for value in var.values:
				if not value[1]:
					self.usage.append(var.name)
					for value in var.values:
						self.usage.append('  ' + value[0])
	
	def get_var(self, name):
		"""
		Gets a var by name. Inits the var if not found.
		"""
		for var in self.vars:
			if var.name == name:
				return var
		var = Var(name, filesystem)
		self.vars.append(var)
		return var
		
	def setup(self):
		self.vars = []
		
	def build(self):
		env = filesystem.get_env()
		for var in env:
			_var = self.get_var(var[0])
			_var.add_values(var[1])	
		self.parameters = ['<varname>', '(...)', '<target>']
		
	
class Path(Action, Sym):
	
	def do_target(self, target, clear = False):
		"""
		Implementation of do_target for Path.
		Activates/Deactivates targets.
		"""
		
		# TODO: implement clear
		
		filesystem.prepare_environment()
		
		i = target[2]
		link = target[1]
		filesystem.create_symlink(link.targets[i], \
			filesystem.environment + 'bin/' + link.alias)
		self.output.append('Setting ' + link.targets[i] \
			+ ' success!')

class Module():
	
	def __init__(self, name = None , description = None , \
		version = 'Undefined', author = 'Undefined', \
		_filesystem = None, _printsystem = None):
		
		self.name = name
		self.description = description
		self.version = version
		self.author = author
		self.actions = []
		return


	def add_action(self, action = None):
		"""
		Adds an action to the module.
		"""
		if action != None:
			self.actions.append(action)
		else:
			raise UserWarning('You must not add an empty action!')
		
	def get_action(self, name):
		"""
		Gets an action by name.
		"""
		i = 0
		for action in self.actions:
			if action.name == name:
				return action
		raise Exception('No such action "' + name + '"!')