#!/usr/bin/python
## Copyright (C) 2000 Red Hat, Inc.
## Copyright (C) 2000 Crutcher Dunnavant <crutcher@redhat.com>,

## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.

## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.

## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

from pyalchemist import *

class SubspaceEditor:
	__dynamic_ctx = None
	__dynamic_box = None
	__static_ctx = None

	def __init__(	self,
			namespace = None,
			subspace = "config",
			namespace_cfg = None):

		self.subspace = subspace

		if (namespace != None):
			# extract the subspace_cfg from the system config
			swb = readNspCtx(namespace = namespace)

			self.namespace_cfg = getNspCfg(
					context = swb,
					namespace = namespace)


		elif (namespace_cfg != None):
			if (type(namespace_cfg) == AdmListType):
				self.namespace_cfg = namespace_cfg
			else:
				raise ValueError, \
				"namespace_cfg not an AdmListType element"
		else:
			raise TypeError, \
			"expected namespace or namespace_cfg, found neither"

		self.subspace_cfg = getSubspCfg(namespace_cfg = self.namespace_cfg,
						subspace = self.subspace)

	def editReadBox(self, editbox):
		# we find out how many boxes are before the one we want to edit
		editpos = \
		self.subspace_cfg["/read_policy/read_set"][editbox].pos

		if editpos != 0:
			# Construct the preview context, that we wont edit
			# this context represents the tree as it will be when
			# the box we are editing merges into it, so that we
			# can be a bit clever about how we edit, if we want to

			# We do NOT make this call if editpos == 0,
			# because depth = 0 means 'all'
			s_ctx = readNsp(namespace_cfg = self.namespace_cfg,
					subspace = self.subspace,
					depth = editpos)
		else:
			s_ctx = None

		# set up the box interface
		d_box = getBox(	subspace_cfg = self.subspace_cfg,
				box_name = editbox)

		d_ctx = d_box.read()

		return {"static_context" : s_ctx,
			"dynamic_box"	: d_box,
			"dynamic_context" : d_ctx}