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

import django_tables2 as tables
import requests
import weasyprint
from django_mysql.models import GroupConcat
from django_tables2 import SingleTableMixin
from django_tables2.export.views import ExportMixin

from membershipworks.models import Member

from .models import Certification, Department, InstructorOrVendor, Waiver

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):
    if request.user.is_superuser:
        departments = Department.objects.prefetch_related(
            "shop_lead_flag__members"
        ).all()
    elif member := Member.from_user(request.user) is not None:
        departments = Department.objects.filter_by_shop_lead(member)
    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}"',
        },
    )


class WarnEmptyColumn(tables.Column):
    attrs = {
        "td": {
            "class": lambda value, bound_column: "table-danger"
            if value == bound_column.default
            else ""
        }
    }


class WaiverReportTable(tables.Table):
    emergency_contact_name = WarnEmptyColumn()
    emergency_contact_number = WarnEmptyColumn()

    class Meta:
        model = Waiver
        fields = [
            "name",
            "date",
            "emergency_contact_name",
            "emergency_contact_number",
            "waiver_version",
            "guardian_name",
            "guardian_relation",
            "guardian_date",
        ]


class WaiverReport(ExportMixin, SingleTableMixin, PermissionRequiredMixin, ListView):
    permission_required = "paperwork.view_waiver"
    template_name = "paperwork/waiver_report.dj.html"
    queryset = Waiver.objects.order_by("name").all()
    table_class = WaiverReportTable
    table_pagination = False


class InstructorOrVendorTable(tables.Table):
    instructor_agreement_date = WarnEmptyColumn(
        "Instructor Agreement Date(s)", default="Missing"
    )
    w9_date = WarnEmptyColumn(default="Missing")

    class Meta:
        model = InstructorOrVendor
        fields = [
            "name",
            "instructor_agreement_date",
            "w9_date",
            "phone",
            "email_address",
        ]


class InstructorOrVendorReport(
    ExportMixin,
    SingleTableMixin,
    PermissionRequiredMixin,
    ListView,
):
    permission_required = "paperwork.view_instructororvendor"
    template_name = "paperwork/instructor_or_vendor_report.dj.html"
    queryset = InstructorOrVendor.objects.order_by("name").all()
    table_class = InstructorOrVendorTable
    export_formats = ("csv", "xlsx", "ods")

    def get_table_data(self):
        return (
            super()
            .get_table_data()
            .values("name")
            .annotate(
                instructor_agreement_date=GroupConcat(
                    "instructor_agreement_date", distinct=True, ordering="asc"
                ),
                w9_date=GroupConcat("w9_date", distinct=True, ordering="asc"),
                phone=GroupConcat("phone", distinct=True, ordering="asc"),
                email_address=GroupConcat(
                    "email_address", distinct=True, ordering="asc"
                ),
            )
        )