from django.http import HttpResponse

from django.shortcuts import redirect, render_to_response

from pytask.taskapp.models import Task

from pytask.taskapp.forms.user import RegistrationForm, LoginForm

from pytask.taskapp.events.user import createUser

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

from django.contrib.auth.models import User

def show_msg(error_msg):

    """ simply redirect to homepage """

    return render_to_response('error.html',{'error_msg':error_msg})

def homepage(request):

    """ check for authentication and display accordingly. """

    user = request.user

    is_guest = False

    is_mentor = False

    can_create_task = False

    task_list = []

    if not user.is_authenticated():

        is_guest = True

        disp_num = 10

        tasks_count = Task.objects.count()

        if tasks_count <= disp_num:

            task_list = Task.objects.order_by('id').reverse()

        else:

            task_list = Task.objects.order_by('id').reverse()[:10]

    else:

        user_profile = user.get_profile()

        is_mentor = True if user.task_mentors.all() else False

        can_create_task = False if user_profile.rights == u"CT" else True

    context = {'user':user,

               'is_guest':is_guest,

               'is_mentor':is_mentor,

               'task_list':task_list,

               'can_create_task':can_create_task,

               }

    return render_to_response('index.html', context)

def register(request):

    """ user registration: gets the user details and create the user and userprofile if data entered is valid"""

    if request.method == 'POST':

        form = RegistrationForm(request.POST)

        if form.is_valid():

            data = form.cleaned_data

            if data['password'] == data['repeat_password']:

                if data['username'].isalnum():

                    try:

                        if User.objects.get(username__exact = data['username']):

                            errors=['Choose some other username']

                            return render_to_response('user/register.html',{'form':form,'errors':errors})

                    except:

                         u = createUser(username=data['username'], email=data['email'], password=data['password'],dob = data['dob'],gender = data['gender'])

                    return redirect('/accounts/login/')

                else:

                    errors = ['Username can contain only alphabets and numbers!']

                    return render_to_response('user/register.html',{'form':form,'errors':errors})

            else:

                errors=['Password do not match']

                form = RegistrationForm(request.POST)

                return render_to_response('user/register.html',{'form':form,'errors':errors})#HttpResponse('Password did not match')

        else:

            form = RegistrationForm(request.POST)

    else:

        form = RegistrationForm()

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

def user_login(request):

    if request.method == 'POST':

        username = request.POST['username']

        password = request.POST['password']

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

        if user is not None:

            if user.is_active:

                login(request, user)

                return redirect('/')# Redirect to a success page.

            else:

                return show_msg('username is not active, please contact the administrator')# Return a 'disabled account' error message

        else:

            errors = ['Please check your username and password']

            form = LoginForm()

            return render_to_response('user/login.html',{'form':form,'errors':errors})# Return an 'invalid login' error message.

        return redirect('/')

    else:

        form = LoginForm()

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

def user_logout(request):

    logout(request)

    return show_msg('You have logged off successfully!!!')