import xml.etree.ElementTree as et
from django.http import HttpResponse, Http404
from boards.models import GlobalId, Post


def respond_pull(request):
    pass


def respond_get(request):
    """
    Processes a GET request with post ID list and returns the posts XML list.
    Request should contain an 'xml' post attribute with the actual request XML.
    """

    request_xml = request.POST['xml']

    posts = []

    root_tag = et.fromstring(request_xml)
    model_tag = root_tag[0]
    for id_tag in model_tag:
        try:
            global_id = GlobalId.from_xml_element(id_tag, existing=True)
            posts += Post.objects.filter(global_id=global_id)
        except GlobalId.DoesNotExist:
            # This is normal. If we don't have such GlobalId in the system,
            # just ignore this ID and proceed to the next one.
            pass

    response_xml = Post.objects.generate_response_get(posts)

    return HttpResponse(content=response_xml)


def get_post_sync_data(request, post_id):
    try:
        post = Post.objects.get(id=post_id)
    except Post.DoesNotExist:
        raise Http404()

    content = 'Global ID: %s\n\nXML: %s' \
              % (post.global_id, Post.objects.generate_response_get([post]))


    return HttpResponse(
        content_type='text/plain',
        content=content,
    )