from xml.dom.minidom import parseString

from django.template import Context, Template

from django.http import HttpResponse, HttpResponseRedirect

from django.contrib.auth.decorators import login_required

from django.newforms.forms import Form

from django.newforms import fields

def get_view(request):

    "A simple view that expects a GET request, and returns a rendered template"

    t = Template('This is a test. {{ var }} is the value.', name='GET Template')

    c = Context({'var': 42})

    return HttpResponse(t.render(c))

def post_view(request):

    """A view that expects a POST, and returns a different template depending

    on whether any POST data is available

    """

    if request.method == 'POST':

        if request.POST:

            t = Template('Data received: {{ data }} is the value.', name='POST Template')

            c = Context({'data': request.POST['value']})

        else:

            t = Template('Viewing POST page.', name='Empty POST Template')

            c = Context()

    else:

        t = Template('Viewing GET page.', name='Empty GET Template')

        c = Context()

    return HttpResponse(t.render(c))

def raw_post_view(request):

    """A view which expects raw XML to be posted and returns content extracted

    from the XML"""

    if request.method == 'POST':

        root = parseString(request.raw_post_data)

        first_book = root.firstChild.firstChild

        title, author = [n.firstChild.nodeValue for n in first_book.childNodes]

        t = Template("{{ title }} - {{ author }}", name="Book template")

        c = Context({"title": title, "author": author})

    else:

        t = Template("GET request.", name="Book GET template")

        c = Context()

    return HttpResponse(t.render(c))

def redirect_view(request):

    "A view that redirects all requests to the GET view"

    return HttpResponseRedirect('/test_client/get_view/')

TestChoices = (

    ('a', 'First Choice'),

    ('b', 'Second Choice'),

    ('c', 'Third Choice'),

    ('d', 'Fourth Choice'),

    ('e', 'Fifth Choice')

)

class TestForm(Form):

    text = fields.CharField()

    email = fields.EmailField()

    value = fields.IntegerField()

    single = fields.ChoiceField(choices=TestChoices)

    multi = fields.MultipleChoiceField(choices=TestChoices)

def form_view(request):

    "A view that tests a simple form"

    if request.method == 'POST':

        form = TestForm(request.POST)

        if form.is_valid():

            t = Template('Valid POST data.', name='Valid POST Template')

            c = Context()

        else:

            t = Template('Invalid POST data. {{ form.errors }}', name='Invalid POST Template')

            c = Context({'form': form})

    else:

        form = TestForm()

        t = Template('Viewing base form. {{ form }}.', name='Form GET Template')

        c = Context({'form': form})

    return HttpResponse(t.render(c))

def login_protected_view(request):

    "A simple view that is login protected."

    t = Template('This is a login protected test. Username is {{ user.username }}.', name='Login Template')

    c = Context({'user': request.user})

    return HttpResponse(t.render(c))

login_protected_view = login_required(login_protected_view)

def session_view(request):

    "A view that modifies the session"

    request.session['tobacconist'] = 'hovercraft'

    t = Template('This is a view that modifies the session.', 

                 name='Session Modifying View Template')

    c = Context()

    return HttpResponse(t.render(c))

def broken_view(request):

    """A view which just raises an exception, simulating a broken view."""

    raise KeyError("Oops! Looks like you wrote some bad code.")