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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz.

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# See COPYING file for copyrights details.

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from __future__ import absolute_import

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import os

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from lxml import etree

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import util.paths as paths

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from plcopen.structures import StdBlckLibs

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ScriptDirectory = paths.AbsDir(__file__)

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class XSLTModelQuery(object):

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    """ a class to handle XSLT queries on project and libs """

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    def __init__(self, controller, xsltpath, ext = []):

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        # arbitrary set debug to false, updated later

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        self.debug = False

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        # merge xslt extensions for library access to query specific ones

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        xsltext = [

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            ("GetProject", lambda *_ignored: 

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                [controller.GetProject(self.debug)]),

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            ("GetStdLibs", lambda *_ignored: 

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                [lib for lib in StdBlckLibs.values()]),

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            ("GetExtensions", lambda *_ignored: 

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                [ctn["types"] for ctn in controller.ConfNodeTypes])

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        ] + ext

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        # parse and compile. "beremiz" arbitrary namespace for extensions 

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        self.xslt = etree.XSLT(

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            etree.parse(

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                os.path.join(ScriptDirectory, xsltpath),

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                etree.XMLParser()),

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            extensions={ ("beremiz", name):call for name, call in xsltext})

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    def _process_xslt(self, root, debug, **kwargs):

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        self.debug = debug

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        res = self.xslt(root,**{k:etree.XSLT.strparam(v) for k,v in kwargs.iteritems()})

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        # print(self.xslt.error_log)

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        return res

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# -------------------------------------------------------------------------------

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#           Helpers functions for translating list of arguments

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#                       from xslt to valid arguments

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# -------------------------------------------------------------------------------

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def _StringValue(x):

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    return x

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def _BoolValue(x):

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    return x in ["true", "0"]

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def _translate_args(translations, args):

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    return [translate(arg[0]) if len(arg) > 0 else None

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            for translate, arg in

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            zip(translations, args)]

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