from django.conf import settings
from xml.dom.minidom import parse, parseString

''' This file will eventually form an abstraction layer between the
course XML file and the rest of the system. 
'''

def toc_from_xml(active_chapter,active_section):
    dom=parse(settings.DATA_DIR+'course.xml')

    course = dom.getElementsByTagName('course')[0]
    name=course.getAttribute("name")
    chapters = course.getElementsByTagName('chapter')
    ch=list()
    for c in chapters:
        sections=list()
        for s in c.getElementsByTagName('section'):
            sections.append({'name':s.getAttribute("name"), 
                             'time':s.getAttribute("time"), 
                             'format':s.getAttribute("format"), 
                             'due':s.getAttribute("due"),
                             'active':(c.getAttribute("name")==active_chapter and \
                                           s.getAttribute("name")==active_section)})
        ch.append({'name':c.getAttribute("name"), 
                   'sections':sections,
                   'active':(c.getAttribute("name")==active_chapter)})
    return ch

def dom_select(dom, element_type, element_name):
    if dom==None:
        return None
    elements=dom.getElementsByTagName(element_type)
    for e in elements:
        if e.getAttribute("name")==element_name:
            return e
    return None