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#!/usr/bin/python

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

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import os

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from nevow import rend, appserver, inevow, tags, loaders, athena

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import simplejson as json

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svgfile = '%(svgfile)s'

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svguiWidgets={}

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class SvguiWidget:

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    def __init__(self, classname, back_id, **kwargs):

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        self.classname = classname

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        self.back_id = back_id

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        self.attrs = kwargs.copy()

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        self.lastattrs = kwargs.copy()

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        self.inhibit = False

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        self.changed = False

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    def setattr(self, attrname, value):

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        self.attrs[attrname] = value

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    def getattr(self, attrname):

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        return self.args.get(attrname, None)

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    def update(self, **kwargs):

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        for attrname, value in kwargs.iteritems():

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            if self.lastattrs.get(attrname, None) != value:

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                self.changed = True

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                self.attrs[attrname] = value

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                self.lastattrs[attrname] = value

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        interface = website.getHMI()

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        if interface is not None and self.changed and not self.inhibit:

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            self.changed = False

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            interface.sendData(self)

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        return self.attrs["state"]

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def convert_to_builtin_type(obj):

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    # Convert objects to a dictionary of their representation

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    d = { '__class__':obj.classname,

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          'back_id':obj.back_id,

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          'kwargs':json.dumps(obj.attrs),

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          }

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    return d

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def dataToSend():

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    gadgets = []

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    for gadget in svguiWidgets.values():

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        gadgets.append(unicode(json.dumps(gadget, default=convert_to_builtin_type, indent=2), 'ascii'))

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    return gadgets

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class SVGUI_HMI(athena.LiveElement):

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    jsClass = u"LiveSVGPage.LiveSVGWidget"

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    docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[                                    

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                                         tags.xml(loaders.xmlfile(os.path.join(WorkingDir, svgfile))),

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                                         ])

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    def sendData(self,data):

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        objDefer = self.callRemote('receiveData',unicode(json.dumps(data, default=convert_to_builtin_type, indent=2), 'ascii'))

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    def initClient(self):

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        self.callRemote('init', dataToSend())

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    def setattr(self, id, attrname, value):

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        svguiWidgets[id].setattr(attrname, value)

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def SVGUI(*args, **kwargs):

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    classname, back_id = args

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    gad = svguiWidgets.get(back_id, None)

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    if gad is None:

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        gad = SvguiWidget(classname, back_id, **kwargs)

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        svguiWidgets[back_id] = gad

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        gadget = [unicode(json.dumps(gad, default=convert_to_builtin_type, indent=2), 'ascii')]

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        interface = website.getHMI()

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        if interface is not None:

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            interface.callRemote('init', gadget)

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    return gad.update(**kwargs)