from django.shortcuts import render, get_object_or_404
from django.http import JsonResponse
from . import models
from django.utils.translation import get_language
from . import forms
from django.contrib.auth.decorators import login_required
import ast
from django.template.loader import render_to_string
# from .dashboard import get_dashboard_data
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.messages.views import SuccessMessageMixin
from django.views.generic import ListView, CreateView, UpdateView, DeleteView, DetailView
# JobForm removed - using JobPostingForm instead
from django.urls import reverse_lazy
from django.db.models import Q

from datastar_py.django import (
    DatastarResponse,
    ServerSentEventGenerator as SSE,
    read_signals,
)

class JobListView(LoginRequiredMixin, ListView):
    model = models.JobPosting
    template_name = 'jobs/job_list.html'
    context_object_name = 'jobs'
    paginate_by = 10

    def get_queryset(self):
        queryset = super().get_queryset().order_by('-created_at')

        # Handle search
        search_query = self.request.GET.get('search', '')
        if search_query:
            queryset = queryset.filter(
                Q(title__icontains=search_query) |
                Q(description__icontains=search_query) |
                Q(department__icontains=search_query)
            )

        # Filter for non-staff users
        if not self.request.user.is_staff:
            queryset = queryset.filter(status='Published')

        return queryset

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['search_query'] = self.request.GET.get('search', '')
        context['lang'] = get_language()
        return context


class JobCreateView(LoginRequiredMixin,  SuccessMessageMixin, CreateView):
    model = models.JobPosting
    form_class = forms.JobPostingForm
    template_name = 'jobs/create_job.html'
    success_url = reverse_lazy('job_list')
    success_message = 'Job created successfully.'


class JobUpdateView(LoginRequiredMixin,  SuccessMessageMixin, UpdateView):
    model = models.JobPosting
    form_class = forms.JobPostingForm
    template_name = 'jobs/edit_job.html'
    success_url = reverse_lazy('job_list')
    success_message = 'Job updated successfully.'
    slug_url_kwarg = 'slug'


class JobDeleteView(LoginRequiredMixin,  SuccessMessageMixin, DeleteView):
    model = models.JobPosting
    template_name = 'jobs/partials/delete_modal.html'
    success_url = reverse_lazy('job_list')
    success_message = 'Job deleted successfully.'
    slug_url_kwarg = 'slug'

class JobCandidatesListView(LoginRequiredMixin, ListView):
    model = models.Candidate
    template_name = 'jobs/job_candidates_list.html'
    context_object_name = 'candidates'
    paginate_by = 10

    def get_queryset(self):
        # Get the job by slug
        self.job = get_object_or_404(models.JobPosting, slug=self.kwargs['slug'])

        # Filter candidates for this specific job
        queryset = models.Candidate.objects.filter(job=self.job)

        # Handle search
        search_query = self.request.GET.get('search', '')
        if search_query:
            queryset = queryset.filter(
                Q(first_name__icontains=search_query) |
                Q(last_name__icontains=search_query) |
                Q(email__icontains=search_query) |
                Q(phone__icontains=search_query) |
                Q(stage__icontains=search_query)
            )

        # Filter for non-staff users
        if not self.request.user.is_staff:
            return models.Candidate.objects.none()  # Restrict for non-staff

        return queryset.order_by('-created_at')

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['search_query'] = self.request.GET.get('search', '')
        context['job'] = getattr(self, 'job', None)
        return context


class CandidateListView(LoginRequiredMixin, ListView):
    model = models.Candidate
    template_name = 'recruitment/candidate_list.html'
    context_object_name = 'candidates'
    paginate_by = 10

    def get_queryset(self):
        queryset = super().get_queryset()

        # Handle search
        search_query = self.request.GET.get('search', '')
        if search_query:
            queryset = queryset.filter(
                Q(first_name__icontains=search_query) |
                Q(last_name__icontains=search_query) |
                Q(email__icontains=search_query) |
                Q(phone__icontains=search_query) |
                Q(stage__icontains=search_query) |
                Q(job__title__icontains=search_query)
            )

        # Filter for non-staff users
        if not self.request.user.is_staff:
            return models.Candidate.objects.none()  # Restrict for non-staff

        return queryset.order_by('-created_at')

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['search_query'] = self.request.GET.get('search', '')
        return context


class CandidateCreateView(LoginRequiredMixin,  SuccessMessageMixin, CreateView):
    model = models.Candidate
    form_class = forms.CandidateForm
    template_name = 'recruitment/candidate_create.html'
    success_url = reverse_lazy('candidate_list')
    success_message = 'Candidate created successfully.'

    def get_initial(self):
        initial = super().get_initial()
        if 'slug' in self.kwargs:
            job = get_object_or_404(models.JobPosting, slug=self.kwargs['slug'])
            initial['job'] = job
        return initial

    def form_valid(self, form):
        if 'slug' in self.kwargs:
            job = get_object_or_404(models.JobPosting, slug=self.kwargs['slug'])
            form.instance.job = job
        return super().form_valid(form)


class CandidateUpdateView(LoginRequiredMixin,  SuccessMessageMixin, UpdateView):
    model = models.Candidate
    form_class = forms.CandidateForm
    template_name = 'recruitment/candidate_update.html'
    success_url = reverse_lazy('candidate_list')
    success_message = 'Candidate updated successfully.'
    slug_url_kwarg = 'slug'


class CandidateDeleteView(LoginRequiredMixin,  SuccessMessageMixin, DeleteView):
    model = models.Candidate
    template_name = 'recruitment/candidate_delete.html'
    success_url = reverse_lazy('candidate_list')
    success_message = 'Candidate deleted successfully.'
    slug_url_kwarg = 'slug'


def job_detail(request, slug):
    job = get_object_or_404(models.JobPosting, slug=slug, status='Published')
    form = forms.CandidateForm()
    return render(request, 'jobs/job_detail.html', {'job': job, 'form': form})


@login_required
def training_list(request):
    materials = models.TrainingMaterial.objects.all().order_by('-created_at')
    return render(request, 'recruitment/training_list.html', {'materials': materials})


def candidate_detail(request, slug):
    candidate = get_object_or_404(models.Candidate, slug=slug)
    try:
        parsed = ast.literal_eval(candidate.parsed_summary)
    except:
        parsed = {}

    # Create stage update form for staff users
    stage_form = None
    if request.user.is_staff:
        stage_form = forms.CandidateStageForm(candidate=candidate)

    return render(request, 'recruitment/candidate_detail.html', {
        'candidate': candidate,
        'parsed': parsed,
        'stage_form': stage_form,
    })

def candidate_update_stage(request, slug):
    """Handle HTMX stage update requests"""
    from time import sleep
    sleep(5)
    try:
        if not request.user.is_staff:
            return render(request, 'recruitment/partials/error.html', {'error': 'Permission denied'}, status=403)

        candidate = get_object_or_404(models.Candidate, slug=slug)

        if request.method != 'POST':
            return render(request, 'recruitment/partials/error.html', {'error': 'Only POST method is allowed'}, status=405)

        # Handle form data
        form = forms.CandidateStageForm(request.POST, candidate=candidate)
        if form.is_valid():
            stage_value = form.cleaned_data['stage']

            # Validate stage value
            valid_stages = [choice[0] for choice in models.Candidate.Stage.choices]
            if stage_value not in valid_stages:
                return render(request, 'recruitment/partials/error.html', {'error': f'Invalid stage value. Must be one of: {", ".join(valid_stages)}'}, status=400)

            # Check transition rules
            if candidate.pk and stage_value != candidate.stage:
                old_stage = candidate.stage
                if not candidate.can_transition_to(stage_value):
                    return render(request, 'recruitment/partials/error.html', {'error': f'Cannot transition from "{old_stage}" to "{stage_value}". Transition not allowed.'}, status=400)

            # Update the stage
            old_stage = candidate.stage
            candidate.stage = stage_value
            candidate.save()

            # Return success template
            context = {
                'form': form,
                'success': True,
                'message': f'Stage updated from "{old_stage}" to "{candidate.stage}"',
                'new_stage': candidate.stage,
                'new_stage_display': candidate.get_stage_display(),
                'candidate': candidate
            }
            def response():
                stage_form = forms.CandidateStageForm(candidate=candidate)
                context['stage_form'] = stage_form
                stage_form_partial = render_to_string('recruitment/partials/stage_update_modal.html#id-stage', context)
                success_html = render_to_string('recruitment/partials/stage_update_success.html', context)
                yield SSE.patch_elements(stage_form_partial,"#id_stage")
                yield SSE.patch_elements(success_html,"#availableStagesInfo")
                yield SSE.patch_signals({'stage':candidate.stage})

            return DatastarResponse(response())
            # return render(request, 'recruitment/partials/stage_update_success.html', context)
        else:
            # Return form with errors
            context = {
                'form': form,
                'candidate': candidate,
                'stage_form': forms.CandidateStageForm(candidate=candidate)
            }
            return render(request, 'recruitment/partials/stage_update_form.html', context)

    except Exception as e:
        # Log the error for debugging
        import traceback
        error_details = traceback.format_exc()
        print(f"Error in candidate_update_stage: {error_details}")

        return render(request, 'partials/error.html', {'error': f'Internal server error: {str(e)}'}, status=500)


class TrainingListView(LoginRequiredMixin, ListView):
    model = models.TrainingMaterial
    template_name = 'recruitment/training_list.html'
    context_object_name = 'materials'
    paginate_by = 10

    def get_queryset(self):
        queryset = super().get_queryset()

        # Handle search
        search_query = self.request.GET.get('search', '')
        if search_query:
            queryset = queryset.filter(
                Q(title__icontains=search_query) |
                Q(description__icontains=search_query)
            )

        # Filter for non-staff users
        if not self.request.user.is_staff:
            return models.TrainingMaterial.objects.none()  # Restrict for non-staff

        return queryset.filter(created_by=self.request.user).order_by('-created_at')

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['search_query'] = self.request.GET.get('search', '')
        return context


class TrainingCreateView(LoginRequiredMixin,  SuccessMessageMixin, CreateView):
    model = models.TrainingMaterial
    form_class = forms.TrainingMaterialForm
    template_name = 'recruitment/training_create.html'
    success_url = reverse_lazy('training_list')
    success_message = 'Training material created successfully.'

    def form_valid(self, form):
        form.instance.created_by = self.request.user
        return super().form_valid(form)


class TrainingUpdateView(LoginRequiredMixin,  SuccessMessageMixin, UpdateView):
    model = models.TrainingMaterial
    form_class = forms.TrainingMaterialForm
    template_name = 'recruitment/training_update.html'
    success_url = reverse_lazy('training_list')
    success_message = 'Training material updated successfully.'
    slug_url_kwarg = 'slug'


class TrainingDetailView(LoginRequiredMixin, DetailView):
    model = models.TrainingMaterial
    template_name = 'recruitment/training_detail.html'
    context_object_name = 'material'
    slug_url_kwarg = 'slug'

class TrainingDeleteView(LoginRequiredMixin,  SuccessMessageMixin, DeleteView):
    model = models.TrainingMaterial
    template_name = 'recruitment/training_delete.html'
    success_url = reverse_lazy('training_list')
    success_message = 'Training material deleted successfully.'


def dashboard_view(request):
    total_jobs = models.JobPosting.objects.count()
    total_candidates = models.Candidate.objects.count()
    jobs = models.JobPosting.objects.all()

    job_titles = [job.title for job in jobs]
    job_app_counts = [job.candidates.count() for job in jobs]
    average_applications = round(sum(job_app_counts) / total_jobs, 2) if total_jobs > 0 else 0

    context = {
        'total_jobs': total_jobs,
        'total_candidates': total_candidates,
        'job_titles': job_titles,
        'job_app_counts': job_app_counts,
        'average_applications': average_applications,
    }
    return render(request, 'recruitment/dashboard.html', context)