import logging

from django import forms
from django.conf import settings
from django.contrib import messages
from django.contrib.auth import update_session_auth_hash, authenticate, login, get_user_model
from django.contrib.auth.decorators import login_required
from django.contrib.auth.forms import PasswordChangeForm
from django.core.mail import send_mail
from django.db.models import ProtectedError
from django.forms import widgets
from django.shortcuts import render, redirect
from django.template import TemplateDoesNotExist
from django.utils.translation import ugettext

from basetheme_bootstrap import user_preferences
from basetheme_bootstrap.forms import UserCreationFormWithMore, \
    MyUserChangeForm, UserDeleteForm

logger = logging.getLogger(__name__)


def about_page(request):
    context = {}
    try:
        return render(request, settings.BASETHEME_BOOTSTRAP_TEMPLATE_LOCATION_PROJECT + '/about.html')
    except TemplateDoesNotExist:
        return render(request, 'basetheme_bootstrap/about.example.html')


@login_required
def change_password(request):
    if request.method == 'POST':
        form = PasswordChangeForm(request.user, request.POST)
        if form.is_valid():
            user = form.save()
            update_session_auth_hash(request, user)  # Important!
            messages.success(request, 'Your password was successfully updated!')
            return redirect('basetheme_bootstrap:account')
        else:
            messages.error(request, 'Please correct the error below.')
    else:
        form = PasswordChangeForm(request.user)
    return render(request, 'registration/small_form_host.html', {
        'title': ugettext('Change password'),
        'submit_text': ugettext('Save changes'),
        'form': form
    })


def signup(request):
    if request.method == 'POST':
        form = UserCreationFormWithMore(request.POST)
        if form.is_valid():
            user = form.save()
            if get_user_model().objects.filter(pk__gt=1).count() == 0:
                user.is_superuser = True
                user.is_staff = True
                user.save()
            username = user.username
            raw_password = form.cleaned_data.get('password1')
            user = authenticate(username=username, password=raw_password)
            request.user = user

            try:
                send_mail(
                    subject=ugettext('Account successfully created'),
                    message=ugettext(
                        'Dear %(first_name)s %(last_name)s\n\n'
                        'Your account have successfully been created on %(joined)s.\n\nBest regards') % dict(
                        first_name=request.user.first_name,
                        last_name=request.user.last_name,
                        joined=str(request.user.date_joined),
                    ),
                    from_email=settings.DEFAULT_FROM_EMAIL,
                    recipient_list=[request.user.email],
                    fail_silently=False,
                )
            except Exception as e:
                logging.exception("Sending email to user %i failed" % user.pk)

            login(request, user)
            return redirect('home')
    else:
        form = UserCreationFormWithMore()
    return render(request, 'registration/signup.html', {'form': form})


def user_update(request):
    if request.method == 'POST':
        form = MyUserChangeForm(instance=request.user, data=request.POST)
        if form.is_valid():
            user = form.save()
            update_session_auth_hash(request, user)  # Important!
            messages.success(request, 'Your account was successfully updated!')
            return redirect('basetheme_bootstrap:account')
        else:
            messages.error(request, 'Please correct the error below.')
    else:
        form = MyUserChangeForm(instance=request.user)
    return render(request, 'registration/small_form_host.html', {
        'title': ugettext('Update account'),
        'submit_text': ugettext('Save changes'),
        'form': form,
        'medium_width': True,
    })


def user_delete(request):
    if request.method == 'POST':
        form = UserDeleteForm(instance=request.user, data=request.POST)
        if form.is_valid():
            try:
                user = form.save()
                user.delete()
                update_session_auth_hash(request, user)  # Important!
                messages.success(request, 'Your account was successfully deleted!')
                return redirect('/')
            except ProtectedError as e:
                messages.error(request, ugettext("Some data remaining in the system prevent the deletion of your "
                                                 "account. Please either remove these data, or contact the "
                                                 "administrator to solve the issue.\nMessage:\n" + str(e)))
            except Exception as e:
                messages.error(request, e)
    else:
        form = UserDeleteForm(instance=request.user)
    return render(request, 'registration/small_form_host.html', {
        'title': ugettext('Account deletion'),
        'submit_text': ugettext('Delete account and all related data'),
        'form': form,
        'medium_width': True,
        'btn_classes': 'btn-lg btn-danger text-center',
        'btn_container_classes': 'text-center',
    })


@login_required
def account_detail(request):
    klass = user_preferences.get_user_preference_class()
    if klass is None:
        form_prefs = None
    else:
        is_posted = request.method == 'POST'
        pref = klass.get_for_user(user=request.user)
        form_prefs = forms.modelform_factory(
            klass,
            fields=list(klass.get_allowed_fields()),
        )(instance=pref, data=request.POST if is_posted else None)
        if is_posted and form_prefs.is_valid():
            form_prefs.save()
            form_prefs = forms.modelform_factory(
                klass,
                fields=list(klass.get_allowed_fields()),
            )(instance=klass.get_for_user(user=request.user))
        # dirty patch for time field (don't know why django doesn't express the correct type by default)
        for f in form_prefs.fields.values():
            if isinstance(f.widget, widgets.TimeInput):
                f.widget.input_type = 'time'
    return render(request, 'registration/account.html', {
        'form_prefs': form_prefs,
        'btn_classes': 'pull-right float-right'
    })