from datetime import datetime

from django.http import Http404

from django.utils.datastructures import MultiValueDictKeyError

from django.contrib.auth.models import User

from django.contrib.auth import authenticate, login, logout

from django.contrib.auth.decorators import login_required

from django.shortcuts import render_to_response, redirect

from workshop.reg.models import Event, Profile

from workshop.reg import forms as reg_forms

from workshop.reg import events as reg_events

from workshop.feedback.models import Feedback

def homepage(request):

    """ see if the user is active.

    If not, only show the re send activation email link.

    else show all the options in homepage.

    """

    user = request.user

    if user.is_authenticated() and user.is_active:

        registered_events = user.event_attendees.all()

    else:

        registered_events = None

    return render_to_response('index.html', {'user':user, 'registered_events':registered_events})

def user_login(request):

    """ get the user object from e-mail and then check for password.

    """

    user = request.user

    if user.is_authenticated():

        return redirect('/reg')

    if request.method == "POST":

        form = reg_forms.LoginForm(request.POST)

        if form.is_valid():

            email = form.cleaned_data['email']

            password = form.cleaned_data['password']

            username = User.objects.get(email__iexact=email).username

            user = authenticate(username=username, password=password)

            if user.is_active:

                login(request, user)

                return redirect('/reg')

            else:

                return render_to_response('account_inactive.html', {'email':email})

        else:

            return render_to_response('login.html', {'user':user, 'form':form})

    else:

        form = reg_forms.LoginForm()

        return render_to_response('login.html', {'user':user, 'form':form})

def user_logout(request):

    """ simply logout the user and redirect to homepage.

    """

    logout(request)

    return redirect('/reg')

def user_register(request, event_key):

    """ take the credentials like name, college and gender here itself.

    """

    if event_key:

        try:

            event = Event.objects.get(key=event_key)

        except Event.DoesNotExist:

            raise Http404

        if not event.registration_is_open:

            raise Http404

    else:

        event = None

    if request.method == "POST":

        form = reg_forms.RegisterForm(request.POST)

        if form.is_valid():

            data = form.cleaned_data

            new_user = reg_events.create_user(email=data['email'],

                                              password=data['password'],

                                              first_name=data['first_name'],

                                              last_name=data['last_name'], 

                                              gender=data['gender'], 

                                              profession=data['profession'], 

                                              affiliated_to=data['affiliated_to'], 

                                              interests=data['interests']

                                             )

            reg_events.send_activation(new_user)

            if event:

                event.attendees.add(new_user)

                event.save()

            return redirect('/reg/account_created')

        else:

            return render_to_response('register.html', {'form':form, 'event':event})

    else:

        form = reg_forms.RegisterForm()

        return render_to_response('register.html', {'form':form, 'event':event})

def account_created(request):

    """ simply display a page.

    """

    user = request.user

    return render_to_response('account_created.html', {'user':user})

def account_activate(request, activation_key):

    """ see if the key exists.

    see if the corresponding user is inactive.

    """

    user = request.user

    if user.is_authenticated():

        return redirect('/reg')

    try:

        profile = Profile.objects.get(activation_key__iexact=activation_key)

    except Profile.DoesNotExist:

        raise Http404

    return render_to_response('account_activated.html', {'user':user})

def resend_activation(request):

    """ resend only if user is registered and is inactive.

    """

    try:

        email = request.GET['email']

    except MultiValueDictKeyError:

        raise Http404

    try:

        user = User.objects.get(email__iexact=email)

    except User.DoesNotExist:

        raise Http404

    if user.is_active:

        return redirect('/reg')

    profile = user.get_profile()

    activation_key = profile.activation_key

    reg_events.send_activation(user)

    return render_to_response('sent_activationkey.html', {'user':user})

def create_event(request):

    """ see if the user is a staff and only then let him do it.

    """

    user = request.user

    if user.is_authenticated() and user.is_staff:

        if request.method ==  "POST":

            form = reg_forms.EventCreateForm(request.POST)

            if form.is_valid():

                data = form.cleaned_data

                new_event = reg_events.create_event(title=data['title'],

                                                    description=data['description'],

                                                    start_date=data['start_date'],

                                                    stop_date=data['stop_date'],

                                                    venue=data['venue'],

                                                    created_by=user,

                                                   )

                event_url = "/reg/event/view/%s"%(new_event.key)

                return redirect(event_url)

            else:

                return render_to_response('event_create.html', {'user':user, 'form':form})

        else:

            form = reg_forms.EventCreateForm()

            return render_to_response('event_create.html', {'user':user, 'form':form})

    else:

        return redirect('/reg')

def view_event(request, key):

    """ get the event by its key and display it.

    """

    user = request.user

    user_ip = request.META['REMOTE_ADDR']

    try:

        event = Event.objects.get(key__iexact=key)

    except Event.DoesNotExist:

        return redirect("/reg")

    is_guest = False if user.is_authenticated() and user.is_active else True

    is_attendee = True if user in event.attendees.all() else False

    is_org = True if user in event.organizers.all() else False

    can_submit_feedback = False

    if not event.feedback_status == "0":

        try:

            event.feedback.get(user_ip__iexact=user_ip, day=event.feedback_status)

        except Feedback.DoesNotExist:

            can_submit_feedback = True 

    context = {'user': user,

               'is_guest': is_guest,

               'event': event,

               'is_attendee': is_attendee,

               'is_org': is_org,

               'can_submit_feedback': can_submit_feedback,

              }

    return render_to_response('view_event.html', context)

def reset_password(request):

    """ check for the existance of e-mail.

    Then call the event.

    """

    user = request.user

    if user.is_authenticated():

        return redirect('/reg')

    if request.method == "POST":

        form = reg_forms.PasswordResetForm(request.POST)

        if form.is_valid():

            email = form.cleaned_data['email']

            user = User.objects.get(email__iexact=email)

            new_password = reg_events.reset_password(user)

            return render_to_response('password_reset.html', {'user':user, 'new_password':new_password})

        else:

            return render_to_response('password_reset.html', {'user':user, 'form':form})

    else:

        form = reg_forms.PasswordResetForm()

        return render_to_response('password_reset.html', {'user':user, 'form':form})

def change_password(request):

    """ check for the password and then set the new password.

    """

    user = request.user

    if not user.is_authenticated():

        return redirect('/reg')

    if request.method == "POST":

        data = request.POST.copy()

        data.__setitem__('username', user.username)

        form = reg_forms.PasswordChangeForm(data)

        if form.is_valid():

            new_password = form.cleaned_data['new_password']

            reg_events.change_password(user, new_password)

            return render_to_response('password_change.html', {'user':user, 'password_changed': True})

        else:

            return render_to_response('password_change.html', {'user':user, 'form':form})

    else:

        form = reg_forms.PasswordChangeForm()

        return render_to_response('password_change.html', {'user':user, 'form':form})

def open_feedback(request, event_key):

    """ see if the event exists.

    then see if feedback is closed.

    then give option for opening the feedback.

    Any feedback can be opened on any day.

    """

    user = request.user

    try:

        event = Event.objects.get(key__iexact=event_key)

    except Event.DoesNotExist:

        raise Http404

    if user in event.organizers.all() and user.is_staff:

        if event.feedback_status == '0':

            no_of_days = (event.stop_date - event.start_date).days + 1

            if request.method == "POST":

                day = request.POST['day']

                event.feedback_status = day

                event.save()

                return render_to_response('open_feedback.html', {'user':user, 'success': True, 'day':day, 'event':event})

            else:

                return render_to_response('open_feedback.html', {'user':user, 'event': event, 'days': range(1,no_of_days+1)})

        else:

            day = event.feedback_status

            return render_to_response('open_feedback.html', {'user':user, 'success': True, 'day':day, 'event':event})

    else:

        raise Http404

def close_feedback(request, event_key):

    """ check if the user is org.

    and then check if the feedback is open already.

    """

    user = request.user

    try:

        event = Event.objects.get(key__iexact=event_key)

    except Event.DoesNotExist:

        raise Http404

    if user in event.organizers.all() and user.is_staff:

        day = event.feedback_status

        event.feedback_status = '0'

        event.save()

        return render_to_response('close_feedback.html', {'user':user, 'event': event, 'day':day})

    else:

        raise Http404

def open_registration(request, event_key):

    """ simply check for is_org and then set the registration_is_open flag.

    """

    user = request.user

    try:

        event = Event.objects.get(key__iexact=event_key)

    except Event.DoesNotExist:

        return redirect("/reg")

    if user in event.organizers.all() and user.is_staff:

        event.registration_is_open = True

        event.save()

        return render_to_response('reg_open.html', {'user':user, 'event': event})

    else:

        raise Http404

def close_registration(request, event_key):

    """ simply check for is_org and then unset the registration_is_open flag.

    """

    user = request.user

    try:

        event = Event.objects.get(key__iexact=event_key)

    except Event.DoesNotExist:

        return redirect("/reg")

    if user in event.organizers.all() and user.is_staff:

        event.registration_is_open = False

        event.save()

        return render_to_response('reg_close.html', {'user':user, 'event': event})

    else:

        raise Http404

def register_for_event(request, event_key):

    """ check if the user is logged in.

    simply add him to the attendees list.

    """

    user = request.user

    if user.is_authenticated() and user.is_active:

        try:

            event = Event.objects.get(key__iexact=event_key)

        except Event.DoesNotExist:

            return redirect("/reg")

        event.attendees.add(user)

        return render_to_response("event_register.html", {"user":user, 'event':event})

    else:

        return redirect("/reg")

def view_profile(request):

    """ check if user is logged in.

    then show the profile.

    """

    user = request.user

    if not user.is_authenticated():

        return redirect('/reg')

    user_profile = user.get_profile()

    return render_to_response('view_profile.html', {'user':user, 'user_profile':user_profile})

def edit_profile(request):

    """ check if user is logged in.

    """

    user = request.user

    if not user.is_authenticated():

        return redirect('/reg')

    user_profile = user.get_profile()

    if request.method == "POST":

        form = reg_forms.EditProfileForm(request.POST)

        if form.is_valid():

            reg_events.update_profile(user, form.cleaned_data)

            return redirect('/reg/profile/view')

        else:

            return render_to_response('edit_profile.html', {'user':user, 'form':form})

    else:

        old_info = {'first_name': user.first_name,

                    'last_name': user.last_name,

                    'gender':user_profile.gender,

                    'profession': user_profile.profession,

                    'affiliated_to': user_profile.affiliated_to,

                    'interests': user_profile.interests,

                   }

        form = reg_forms.EditProfileForm(old_info)

        return render_to_response('edit_profile.html', {'user':user, 'form':form})

def list_events(request):

    """ Get all the events including those that are over and list them.

    """

    user = request.user

    today = datetime.now()

    context = {'user':user,

               'upcoming_events': Event.objects.filter(start_date__gt=today),

               'ongoing_events': Event.objects.filter(start_date__lte=today, stop_date__gte=today),

               'previous_events': Event.objects.filter(stop_date__lt=today),

              }

    return render_to_response('list_events.html', context)

def list_attendees(request, event_key):

    """ see if the request user is org.

    Else redirect him to homepage.

    """

    user = request.user

    try:

        event = Event.objects.get(key__iexact=event_key)

    except Event.DoesNotExist:

        return redirect('/reg')

    if not user in event.organizers.all():

        return redirect('/reg')

    profile = user.get_profile()

    return render_to_response('list_attendees.html', {'user':user, 'event':event, 'attendees':event.attendees.all()})