# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of "Eclipse Public License v1.0"

# which accompanies this distribution, and is available

# at the URL "http://www.eclipse.org/legal/epl-v10.html".

#

# Initial Contributors:

# Nokia Corporation - initial contribution.

#

# Contributors:

#

# Description: 

#

'''

Ruleml eval extension to check is passed ref changed on given layer(range).

'''

from cone.public import api

import logging

logger = logging.getLogger('cone.ruleplugin.evals.layer_utils')

def give_changed_layers(feat):

    """

    Returns a list of booleans where True means that feature is changed in that layer. Index is

    same than in configuration root's get_configuration_by_index(). 

    """

    logger.debug('Checking feature: %s' % feat.fqr)

    root_conf = feat.get_root_configuration()

    nro_of_layers = len(root_conf.list_configurations())

    result = [False] * nro_of_layers

    for i in range(0, nro_of_layers):

        conf = root_conf.get_configuration_by_index(i)

        logger.debug("Traversing data from configuration: %s" % conf.get_path())

        datas = conf._traverse(type=api.Data, filters=[lambda d: d.fqr==feat.fqr])

        for data in datas:

            try:

                if data.get_value() != None:

                    logger.debug("Feature '%s' is changed in layer %s with data '%s'" % (feat.fqr, i, data.get_value()))

                    result[i] = True

            except Exception, e:

                logger.debug("Failed to check Feature '%s' data in layer %s:", (e,i))

        if result[i] == False:

            logger.debug("Feature '%s' is not changed in layer: %s" % (feat.fqr, i))

    logger.debug("Feature '%s' is changed in layers: %s" % (feat.fqr, result))

    return result

def changed_on_last_layer(feat):

    """

    Returns True if feature is changed in the last layer.

    """

    root_conf = feat.get_root_configuration()

    conf = root_conf.get_configuration_by_index(-2)#autoconfig layer is ignored 

    def check(node):

        if isinstance(node, api.Data) and node.fqr == feat.fqr:

            return True

        for obj in node._objects():

            if check(obj):

                return True

    if check(conf):

        return True

    else:

        return False

def changed_on_autoconfig_layer(feat):

    """

    Returns True if feature is changed in the autoconfig layer.

    """

    root_conf = feat.get_root_configuration()

    conf = root_conf.get_configuration_by_index(-1) 

    def check(node):

        if isinstance(node, api.Data) and node.fqr == feat.fqr:

            return True

        for obj in node._objects():

            if check(obj):

                return True

    if check(conf):

        return True

    else:

        return False

def changed_on_layer(feat, layer):

    """

    Returns True if feature is changed in the given layer.

    """

    try:

        return give_changed_layers(feat)[layer]

    except IndexError, e:

        logger.warning("Given layer is not found: %s" % (layer))

        return False

def changed_on_layers(feat, findex, tindex):

    """

    Returns True if feature is changed in layer of given range.

    """

    layers = give_changed_layers(feat)

    if findex == tindex:

        return changed_on_layer(feat, findex)

    for i in range(findex, tindex):

        if i > len(layers):

            continue

        if layers != None and layers[i] != None and layers[i]:

            return True

    return False