from xml.dom.minidom import parseString
from django.core.mail import EmailMessage, SMTPConnection
from django.template import Context, Template
from django.http import HttpResponse, HttpResponseRedirect, HttpResponseNotFound
from django.contrib.auth.decorators import login_required
from django.newforms.forms import Form
from django.newforms import fields
from django.shortcuts import render_to_response

def no_template_view(request):
    "A simple view that expects a GET request, and returns a rendered template"
    return HttpResponse("No template used")

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/')

def double_redirect_view(request):
    "A view that redirects all requests to a redirection view"
    return HttpResponseRedirect('/test_client/permanent_redirect_view/')

def bad_view(request):
    "A view that returns a 404 with some error content"
    return HttpResponseNotFound('Not found!. This page contains some MAGIC content')

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 form_view_with_template(request):
    "A view that tests a simple form"
    if request.method == 'POST':
        form = TestForm(request.POST)
        if form.is_valid():
            message = 'POST data OK'
        else:
            message = 'POST data has errors'
    else:
        form = TestForm()
        message = 'GET form page'
    return render_to_response('form_view.html', 
        { 
            'form': form,
            'message': message
        }
    )

        
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.")

def mail_sending_view(request):
    EmailMessage(
        "Test message", 
        "This is a test email", 
        "from@example.com", 
        ['first@example.com', 'second@example.com']).send()
    return HttpResponse("Mail sent")

def mass_mail_sending_view(request):
    m1 = EmailMessage(
        'First Test message', 
        'This is the first test email', 
        'from@example.com', 
        ['first@example.com', 'second@example.com'])
    m2 = EmailMessage(
        'Second Test message', 
        'This is the second test email', 
        'from@example.com', 
        ['second@example.com', 'third@example.com'])
    
    c = SMTPConnection()
    c.send_messages([m1,m2])
    
    return HttpResponse("Mail sent")