from django.conf import settings
from django.contrib import staticfiles
from django.contrib.auth.decorators import login_required
from django.http import HttpResponse, HttpResponseBadRequest, HttpResponseNotFound
from django.shortcuts import get_object_or_404, render
from django.views.generic import ListView

import requests
import weasyprint

from membershipworks.models import Member
from .models import Certification, Department

WIKI_URL = settings.WIKI_URL


class MemberCertificationListView(ListView):
    template_name = "paperwork/member_certifications.dj.html"
    context_object_name = "certifications"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["show_outdated"] = (
            self.request.GET.get("show_outdated", "false").lower() == "true"
        )
        return context

    def get_queryset(self):
        self.member = get_object_or_404(Member, uid=self.kwargs["uid"])
        return Certification.objects.filter(member=self.member)


@login_required
def department_certifications(request):
    departments = Department.objects.prefetch_related("shop_lead_flag__members")
    if request.user.is_superuser:
        departments = departments.all()
    elif hasattr(request.user, "ldap_user"):
        user_member = Member.objects.get(
            uid=request.user.ldap_user.attrs["employeeNumber"][0]
        )
        # TODO: could be a lot simpler if membershipworks was in the same database
        # TODO: should also select children
        member_flags = list(user_member.flags.all().values_list("pk", flat=True))
        departments = departments.filter(shop_lead_flag__in=member_flags)
    else:
        departments = []

    certifications = Certification.objects.filter(
        certification_version__definition__department__in=departments
    ).prefetch_related(
        "certification_version__definition__department",
        "member",
    )

    return render(
        request,
        "paperwork/department_certifications.dj.html",
        {"departments": departments, "certifications": certifications},
    )


def certification_pdf(request, cert_name):
    wiki_page = f"{cert_name.replace('_', ' ')} Certification"

    r = requests.get(
        WIKI_URL + "/api.php",
        params={
            "action": "askargs",
            "conditions": wiki_page,
            "printouts": "Version|Approval Date|Approval status",
            "format": "json",
            "api_version": "2",
            "origin": "*",
        },
    )

    results = r.json()["query"]["results"]
    if wiki_page not in results:
        return HttpResponseNotFound(
            f'No such certification found on wiki: <a href="{WIKI_URL}/wiki/{wiki_page}">{wiki_page}</a>'
        )

    printouts = results[wiki_page]["printouts"]
    if printouts["Approval status"] != ["approve"]:
        return HttpResponseBadRequest(
            f'Certification is not yet approved on wiki: <a href="{WIKI_URL}/wiki/{wiki_page}">{wiki_page}</a>'
        )

    filename = (
        f'{wiki_page}_v{printouts["Version"][0]} - {printouts["Approval Date"][0]}.pdf'
    )

    html = weasyprint.HTML(f"{WIKI_URL}/index.php?title={wiki_page}")

    stylesheet = staticfiles.finders.find("paperwork/certification-print.css")
    pdf = html.write_pdf(stylesheets=[stylesheet])
    return HttpResponse(
        pdf,
        headers={
            "Content-Type": "application/pdf",
            "Content-Disposition": f'inline; filename="{filename}"',
        },
    )