#!/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

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

class Action:
	
	
	def __init__(self, name, lines, _filesystem):
		
		self.filesystem = _filesystem
		self.name = name
		self.lines = lines
		self.output = []
		self.usage = []
		self.options = []

		for line in self.lines:
			match = re.match('description "(.*)"', line.lstrip())
			if match:
				self.description = match.group(1)
				continue
			match = re.match('type (.*)', line.lstrip())
			if match:
				type = match.group(1)
				continue
				
		if type == 'runnable':
			self.__class__ = Runnable
		elif type == 'sym':
			if filesystem.uid != 'root':
				self.__class__ = Path
			else:
				self.__class__ = Sym
		self.build()

class Runnable(Action):
	
	def do_action(self, args):
		path = '/tmp/' + self.filename
		self.filesystem.write_file(path, self.code)
		self.filesystem.make_exec_file(path)
		for line in self.filesystem.execute_cmd(path,args):
			self.output.append(line[:-1])
		self.filesystem.delete_file(path)
		for line in self.output:
			self.options.append(['bold', line])
	
	def get_code(self):
		i = 0
		for line in self.lines:
			match = re.match('file (.*) {', line.lstrip())
			if match:
				ident = 1
				for char in line:
					if char == '\t':
						ident += 1
				self.filename = match.group(1)
				for line in self.lines[i+1:]:
					line = line.rstrip()
					line = line.replace('\t', '', ident)
					match = re.match('} ' + self.filename, line)
					if match:
						self.code.append('')
						break
					self.code.append(line)
			i += 1
	
	def build(self):
		self.code = []
		self.get_code()
		for line in self.lines:
			match = re.match('parameters "(.*)"', line.lstrip())
			if match:
				self.parameters = match.group(1)
				continue
			match = re.match('usage "(.*)"', line.lstrip())
			if match:
				self.usage.append(match.group(1))
				continue
				
class Link:
	
	def __init__(self, name, source_dir, source_regexp, source_target, \
		destination, _filesystem):
		
		self.name = name
		self.destination = destination
		self.targets = []
		self.status = []
		self.filesystem = _filesystem

		for dir in self.filesystem.list_dir(source_dir):
			match = re.match(source_regexp, dir)
			if match:
				source = source_dir + match.group(0) + source_target
				self.targets.append(source)
				if self.filesystem.path_exists(destination):
					if self.filesystem.real_path( \
						self.filesystem.environment + self.name) == \
						source:
						self.status.append('notice')
					elif self.filesystem.real_path(destination) == source:
						self.status.append('ok')
					else:
						self.status.append('warning')
							
				else:
					self.status.append('error')
		return

class Sym(Action):
	
	
	def get_links(self):
		for line in self.lines:
			match = re.match('sym (.*) (.*) (.*) (.*) (.*)', line.lstrip())
			if match:
				name = match.group(1)
				source_dir = match.group(3)
				source_regexp = match.group(4)
				if match.group(5) == '*':
					source_target = ''
				else:
					source_target = match.group(5)
				destination = match.group(2)
				self.links.append(Link(name, source_dir, source_regexp,\
				source_target, destination, self.filesystem))
				
	def do_action(self, args):
		
		if len(args) != 0:
			if args[0] == 'clear':
				for link in self.links:
					self.filesystem.delete_file(link.destination)
			elif len(args) >= 1:
				targets = []
				option = int(args[0]) -1
				for link in self.links:
					for i in range(len(link.targets)):
						targets.append([link.targets[i], \
							link.destination])
				if option >= 0 and option < len(targets):
					self.filesystem.create_symlink(targets[option][0], \
						targets[option][1])
					self.output.append('Setting ' + targets[option][0] \
						+ ' success!')
				else:
					raise UserWarning('Invalid Option "' \
						+ args[0] + '"!')
			else:
				raise UserWarning('Invalid Option "' + args[0] \
				+ '"!')
		else:
			for link in self.links:
				for i in range(len(link.targets)):
					self.options.append([link.status[i],str(i+1) + ' - ' + \
					 link.targets[i]])
			self.parameters = '<target>'
			self.usage.append('Available ' + self.name + ' targets:' )
						
	def build(self):
		self.links = []
		self.get_links()

class Path(Action, Sym):
	
	def do_action(self, args):
		if len(args) != 0:
			if args[0] == 'clear':
				home = self.filesystem.get_home()
				for link in self.links:
					self.filesystem.delete_file(home + '.uselect/bin/' \
						+ link.name)
			elif len(args) >= 1:
				options = []
				choice = int(args[0]) - 1
				for link in self.links:
					for i in range(len(link.targets)):
					 	options.append([link.targets[i], \
								link.destination])
					if choice >= 0 and choice < len(options):
						self.filesystem.create_symlink( \
							options[choice][0],
							self.filesystem.environment + \
							link.name)
						self.output.append('Setting ' + options[choice][0] \
							+ ' success!')
					else:
						raise UserWarning('Invalid Option "' \
						+ args[0] + '"!')
			else:
				raise UserWarning('Invalid Option "' + args[0] \
				+ '"!')
		else:
			for link in self.links:
				for i in range(len(link.targets)):
					self.options.append([link.status[i],str(i+1) + ' - ' + \
					 link.targets[i]])
			self.parameters = '<target>'
			self.usage.append('Available ' + self.name + ' targets:' )		
		return

class Module():
	
	def __init__(self, name, _filesystem):
		global filesystem
		filesystem = _filesystem
		self.name = name
		self.version = 'Unknown'
		self.author = 'Anonymous'
		self.description =  name + ' has no description! '
		self.path = modules_dir + self.name + '.uselect'
		self.lines = filesystem.read_file(self.path)
		self.parse_module(name)
		self.actions = []
		
	def parse_module(self, name):
		for line in self.lines:
			line = line.lstrip()
			match = re.match('description "(.*)"', line)
			if match:
				self.description = match.group(1)
				continue
			match = re.match('version "(.*)"', line)
			if match:
				self.version = match.group(1)
				continue
			match = re.match('author "(.*)"', line)
			if match:
				self.author = match.group(1)
				continue
			match = re.match('} ' + name, line)
			if match:
				break
				
	def get_action(self, name):
		i = 0
		self.get_actions()
		for action in self.actions:
			if action.name == name:
				return action
		raise Exception('No such action "' + name + '"!')
			
	def get_actions(self):
		i = 0
		for line in self.lines:
			match = re.match('(\w*) action (\w*)', line.lstrip())
			if match:
				wideness = match.group(1)
				if wideness == "system" and filesystem.uid != "root":
					continue
				name = match.group(2)
				u = 0
				for line in self.lines[i:]:
					match = re.match('} ' + name + '\w*', line)
					if match:
						lines = self.lines[i:i+u+1]
						action = Action(name, lines, filesystem)
						self.actions.append(action)
						break
					u += 1
				if name == '(\w*)':
					break
			i += 1