from django.contrib.auth.mixins import LoginRequiredMixin
from django.db import models
from django.shortcuts import get_object_or_404, render
from django.urls import reverse_lazy
from django.views.generic import CreateView, DeleteView, DetailView, ListView, UpdateView, View

from apps.core.permissions import AdminRequiredMixin
from apps.issues.models import Issue, IssueComment


class IssueListView(LoginRequiredMixin, ListView):
    model = Issue
    template_name = "pages/issues/issue_list.html"
    context_object_name = "issues"
    paginate_by = 20

    def get_queryset(self):
        user = self.request.user
        qs = Issue.objects.select_related("project", "assignee", "reporter")
        if user.is_admin():
            return qs.all()
        if user.is_client():
            return qs.filter(project__client=user)
        return qs.filter(models.Q(assignee=user) | models.Q(reporter=user))


class IssueDetailView(LoginRequiredMixin, DetailView):
    model = Issue
    template_name = "pages/issues/issue_detail.html"
    context_object_name = "issue"

    def get_queryset(self):
        user = self.request.user
        qs = Issue.objects.select_related("project", "assignee", "reporter")
        if user.is_admin():
            return qs.all()
        if user.is_client():
            return qs.filter(project__client=user)
        return qs.filter(models.Q(assignee=user) | models.Q(reporter=user))

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["comments"] = self.object.comments.select_related("author").all()
        return context


class IssueCreateView(LoginRequiredMixin, CreateView):
    model = Issue
    template_name = "pages/issues/issue_form.html"
    fields = ["project", "title", "description", "priority", "assignee"]

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

    def get_success_url(self):
        return reverse_lazy("issue_detail", kwargs={"pk": self.object.pk})


class IssueUpdateView(LoginRequiredMixin, UpdateView):
    model = Issue
    template_name = "pages/issues/issue_form.html"
    fields = ["title", "description", "status", "priority", "assignee"]

    def get_success_url(self):
        return reverse_lazy("issue_detail", kwargs={"pk": self.object.pk})


class IssueDeleteView(AdminRequiredMixin, DeleteView):
    model = Issue
    template_name = "pages/issues/issue_confirm_delete.html"
    success_url = reverse_lazy("issue_list")


class IssueCommentCreateView(LoginRequiredMixin, View):
    def post(self, request, issue_pk):
        issue = get_object_or_404(Issue, pk=issue_pk)
        body = request.POST.get("body", "")
        if body:
            IssueComment.objects.create(issue=issue, author=request.user, body=body)
        if request.htmx:
            return render(request, "partials/issues/comment_list.html", {"comments": issue.comments.all()})
        return render(request, "pages/issues/issue_detail.html", {"issue": issue, "comments": issue.comments.all()})