from django.urls import reverse_lazy
from django.http import HttpResponseRedirect
from django.contrib.auth.mixins import LoginRequiredMixin
from django.views.generic import (View, TemplateView, ListView, CreateView, DetailView)
from django.views.generic.detail import SingleObjectMixin
from django.contrib import messages
from django.shortcuts import get_object_or_404, redirect
from rules.contrib.views import PermissionRequiredMixin
from django.contrib.auth import get_user_model
from django.contrib.auth.decorators import login_required

from .models import Job, Application, Question, JobMessage
from .forms import JobForm, QuestionFormSet, ApplicationForm, AnswerForm, MessageForm
import logging

logger = logging.getLogger(__name__)
User = get_user_model()

class Index(TemplateView):
    template_name = 'jobs/index.html'

    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data(*args, **kwargs)
        context['jobs'] = Job.objects.filter(active=True).order_by('-updated')[:6]
        return context


class JobDetail(DetailView):
    context_object_name = 'job'
    model = Job


class JobRenew(LoginRequiredMixin, PermissionRequiredMixin, SingleObjectMixin,
               View):
    model = Job
    permission_required = 'jobs.change_job'
    http_method_names = ['post']

    def post(self, request, *args, **kwargs):
        job = self.get_object()
        job.renew()
        messages.add_message(
            request, messages.SUCCESS, 'Job has been renewed until {}.'.format(
                job.expires.isoformat(' ', 'seconds')))
        return HttpResponseRedirect(job.get_absolute_url())


class JobCreate(LoginRequiredMixin, CreateView):
    model = Job
    form_class = JobForm
    success_url = reverse_lazy("jobs:job_list")

    def get(self, request, *args, **kwargs):
        self.object = None
        form = self.get_form(self.get_form_class())
        question_form = QuestionFormSet()
        return self.render_to_response(
            self.get_context_data(form=form, question_form=question_form))

    def post(self, request, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        question_form = QuestionFormSet(self.request.POST)
        if (form.is_valid() and question_form.is_valid()):
            return self.form_valid(form, question_form)
        else:
            return self.form_invalid(form, question_form)

    def form_valid(self, form, question_form):
        self.object = form.save(commit=False)
        self.object.posted_by = self.request.user
        self.object.save()
        form.save_m2m()

        question_form.instance = self.object
        question_form.save()

        return HttpResponseRedirect(self.get_success_url())

    def form_invalid(self, form, question_form):
        return self.render_to_response(
            self.get_context_data(form=form, question_form=question_form))


class ApplicationCreate(LoginRequiredMixin, CreateView):
    # TODO: restrict users from re-application
    model = Application
    form_class = ApplicationForm
    success_url = reverse_lazy("jobs:job_list")

    def get_question_queryset(self):
        # filter questions for particular job and order it so same queryset
        # can be used stably as initial params for GET and POST requests
        return Question.objects.filter(
            job_id=self.kwargs['job_pk']).order_by('id')

    def get_answer_formset(self, *args):
        questions = self.get_question_queryset()
        return AnswerForm.inlineformset_factory(extra=questions.count())(
            initial=[{
                'question': q.id
            } for q in questions], *args)

    def get(self, request, *args, **kwargs):
        self.object = None
        form = self.get_form(self.get_form_class())
        answer_form = self.get_answer_formset()
        return self.render_to_response(
            self.get_context_data(form=form, answer_form=answer_form))

    def post(self, request, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        answer_form = self.get_answer_formset(self.request.POST)
        if (form.is_valid() and answer_form.is_valid()):
            return self.form_valid(form, answer_form)
        else:
            return self.form_invalid(form, answer_form)

    def form_valid(self, form, answer_form):
        self.object = form.save(commit=False)
        self.object.applicant = self.request.user
        self.object.job = get_object_or_404(Job, id=self.kwargs['job_pk'])
        self.object.save()
        form.save_m2m()

        answer_form.instance = self.object
        answer_form.save()

        messages.add_message(
            self.request, messages.SUCCESS,
            'Your application has been succesfully received.')

        return HttpResponseRedirect(self.get_success_url())

    def form_invalid(self, form, answer_form):
        return self.render_to_response(
            self.get_context_data(form=form, answer_form=answer_form))


class ApplicationList(LoginRequiredMixin, PermissionRequiredMixin, ListView):
    model = Application
    context_object_name = 'applications'
    permission_required = 'jobs.change_job'

    def get_permission_object(self):
        return get_object_or_404(Job, id=self.kwargs['job_pk'])

    def get_queryset(self):
        return super().get_queryset().filter(job_id=self.kwargs['job_pk'])


class ListOwnApplications(ListView):
    model = Application
    context_object_name = 'applications'
    template_name = 'jobs/list_own_applications.html'

    def get_queryset(self):
        return Application.objects.filter(applicant=self.request.user)

    def get_context_data(self, **kwargs):
        context = super(ListOwnApplications, self).get_context_data(**kwargs)
        context['title'] = 'Your Applications'
        context['application_page'] = 'active'
        return context


class ListJobApplications(ListView):
    model = Application
    context_object_name = 'applications'
    template_name = 'jobs/list_applications_others.html'

    def get_queryset(self):
        return Application.objects.filter(job__posted_by=self.request.user)

    def get_context_data(self, **kwargs):
        context = super(ListJobApplications, self).get_context_data(**kwargs)
class ApplicationDetail(LoginRequiredMixin, DetailView):
    model = Application


class MesssageInbox(LoginRequiredMixin, ListView):
    model = JobMessage
    context_object_name = 'jobmessage'

    def get_queryset(self):
        qs_list = []
        qs = JobMessage.objects.filter(receiver=self.request.user).order_by('-date')
        lookup = set(qs.values_list('sender', flat=True))
        for sender_id in lookup:
            for elem in qs:
                if elem.sender_id == sender_id:
                    qs_list.append(elem.id)
                    break
        return JobMessage.objects.filter(pk__in=qs_list).order_by('-date')

    def get_context_data(self, **kwargs):
        context = super(MesssageInbox, self).get_context_data(**kwargs)
        context['title'] = 'Messages Inbox'
        context['messages_page'] = 'active'
        return context


class Conversation(LoginRequiredMixin, ListView):
    model = JobMessage
    context_object_name = 'jobmessage'
    template_name = 'jobs/conversation.html'

    def get_queryset(self):
        queryset1 = JobMessage.objects.filter(
            receiver=self.request.user, sender=self.kwargs['pk'])
        queryset2 = JobMessage.objects.filter(
            receiver=self.kwargs['pk'], sender=self.request.user)
        return queryset1.union(queryset2).order_by('date')

    def get_context_data(self, **kwargs):
        context = super(Conversation, self).get_context_data(**kwargs)
        context['form'] = MessageForm
        context['person'] = User.objects.get(id=self.kwargs['pk'])
        context['messages_page'] = 'active'
        return context


class MyJobs(LoginRequiredMixin, ListView):
    model = Job
    context_object_name = 'jobs'
    template_name = 'jobs/job.html'

    def get_queryset(self):
        return Job.objects.filter(posted_by=self.request.user).order_by('expires')


    def get_context_data(self, **kwargs):
        context = super(MyJobs, self).get_context_data(**kwargs)
        context['title'] = 'Your jobs'
        context['my_jobs_page'] = 'active'
        return context

@login_required()
def send_message(request):
    form = MessageForm(request.POST)
    if form.is_valid():
        user = User.objects.get(id=request.POST.get('receiver_id'))
        JobMessage.objects.create(sender=request.user, receiver=user, text=request.POST.get('text'))
    else:
        print("Error")
    return redirect('jobs:conversation', pk=request.POST.get('receiver_id'))

@login_required()
def change_status(request):
    try:
        job_obj = Job.objects.get(id=request.POST.get('job_id'))
        if job_obj.posted_by == request.user:
            if job_obj.active:
                job_obj.active = False
            else:
                job_obj.active = True
            job_obj.save()
        else:
            logger.error(
                "the user {} tried to toggle the job id {}. But it doesn't belong to him".format(
                    request.user, request.POST.get('job_id'))
            )
    except Job.DoesNotExist:
        logger.error(
            "the user {} tried to toggle the job id {} but it doesn't exist.".format(
                request.user, request.POST.get('job_id'))
        )
    return redirect('jobs:my_jobs')