import json
import logging

from lxml import etree

from mitxmako.shortcuts import render_to_response, render_to_string

from x_module import XModule, XModuleDescriptor

log = logging.getLogger("mitx.courseware.modules")

class ModuleDescriptor(XModuleDescriptor):
    pass

class Module(XModule):
    id_attribute = 'youtube'
    video_time = 0

    def handle_ajax(self, dispatch, get):
        log.debug(u"GET {0}".format(get))
        log.debug(u"DISPATCH {0}".format(dispatch))
        if dispatch == 'goto_position':
            self.position = int(float(get['position']))
            log.debug(u"NEW POSITION {0}".format(self.position))
            return json.dumps({'success':True})
        raise Http404()

    def get_state(self):
        log.debug(u"STATE POSITION {0}".format(self.position))
        return json.dumps({ 'position':self.position })

    @classmethod
    def get_xml_tags(c):
        '''Tags in the courseware file guaranteed to correspond to the module'''
        return ["video"]

    def video_list(self):
        return self.youtube

    def get_html(self):
        return render_to_string('video.html',{'streams':self.video_list(),
                                              'id':self.item_id,
                                              'position':self.position,
                                              'name':self.name,
                                              'annotations':self.annotations})

    def __init__(self, system, xml, item_id, state=None):
        XModule.__init__(self, system, xml, item_id, state)
        xmltree=etree.fromstring(xml)
        self.youtube = xmltree.get('youtube')
        self.name = xmltree.get('name')
        self.position = 0
        if state is not None:
            state = json.loads(state)
            if 'position' in state:
                self.position = int(float(state['position']))

        self.annotations=[(e.get("name"),self.render_function(e)) \
                      for e in xmltree]
