from typing import TYPE_CHECKING

from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.contrib.auth.mixins import PermissionRequiredMixin
from django.contrib.staticfiles import finders as staticfiles_finders
from django.db import models
from django.db.models import (
    Case,
    Count,
    Exists,
    Max,
    OuterRef,
    Q,
    Subquery,
    Value,
    When,
)
from django.db.models.functions import Concat
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 django_mysql.models.aggregates import GroupConcat
from django_tables2 import SingleTableMixin
from django_tables2.export.views import ExportMixin

from membershipworks.models import Member

from .models import (
    Certification,
    CertificationVersion,
    Department,
    InstructorOrVendor,
    Waiver,
)
from .tables import (
    AccessVerificationTable,
    CertificationCountTable,
    CertifiersTable,
    InstructorOrVendorTable,
    WaiverReportTable,
)

if TYPE_CHECKING:
    from collections.abc import Iterable

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: Iterable[Department]
    if (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 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 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"
                ),
            )
        )


class AccessVerificationReport(
    ExportMixin,
    SingleTableMixin,
    PermissionRequiredMixin,
    ListView,
):
    permission_required = "paperwork.view_certification"
    template_name = "paperwork/access_verification_report.dj.html"
    table_class = AccessVerificationTable
    export_formats = ("csv", "xlsx", "ods")

    def get_queryset(self):
        def shop_error(access_field: str, shop_name: str):
            member_list = CertificationVersion.objects.filter(
                is_current=True,
                definition__department__name=shop_name,
                certification__member__pk__isnull=False,
            ).values("certification__member__pk")
            return Case(
                When(
                    Q(**{access_field: True}) & ~Q(uid__in=Subquery(member_list)),
                    Value("Has access but no cert"),
                ),
                When(
                    Q(**{access_field: False}) & Q(uid__in=Subquery(member_list)),
                    Value("Has cert but no access"),
                ),
                default=None,
            )

        qs = (
            Member.objects.with_is_active()
            .filter(is_active=True)
            .values(
                "account_name",
                "billing_method",
                "join_date",
                "renewal_date",
                "access_front_door",
                "access_studio_space",
                access_card=Concat(
                    "access_card_facility_code",
                    Value("-", models.TextField()),
                    "access_card_number",
                ),
                wood_shop_error=shop_error("access_wood_shop", "Wood Shop"),
                metal_shop_error=shop_error("access_metal_shop", "Metal Shop"),
                extended_hours_error=shop_error(
                    "access_front_door_and_studio_space_during_extended_hours",
                    "Closure/Lock-Up",
                ),
                extended_hours_shops_error=shop_error(
                    "access_permitted_shops_during_extended_hours",
                    "Closure/Lock-Up",
                ),
                storage_closet_error=Case(
                    When(
                        Q(access_storage_closet=True)
                        & ~(
                            Member.objects.has_flag("label", "Volunteer: Desker")
                            | Q(billing_method__startswith="Desker")
                            | Q(
                                Exists(
                                    Department.objects.filter(
                                        shop_lead_flag__members=OuterRef("pk")
                                    )
                                )
                            )
                        ),
                        Value("Has access but not shop lead or desker"),
                    ),
                    default=None,
                ),
            )
            .filter(
                Q(access_front_door=False)
                | Q(access_studio_space=False)
                | Q(wood_shop_error__isnull=False)
                | Q(metal_shop_error__isnull=False)
                | Q(extended_hours_error__isnull=False)
                | Q(extended_hours_shops_error__isnull=False)
                | Q(storage_closet_error__isnull=False)
            )
        )
        return qs


class CertifiersReport(
    ExportMixin,
    SingleTableMixin,
    PermissionRequiredMixin,
    ListView,
):
    model = Certification
    permission_required = "paperwork.view_certification"
    template_name = "paperwork/certifiers_report.dj.html"
    table_class = CertifiersTable
    export_formats = ("csv", "xlsx", "ods")

    def get_queryset(self):
        qs = super().get_queryset()
        return (
            qs.values(
                "certification_version__definition__department__name",
                "certification_version__definition__name",
                "certified_by",
            )
            .annotate(
                number_issued_on_this_tool=Count("*"),
                last_issued_certification_date=Max("date"),
            )
            .order_by(
                "certification_version__definition__name",
                "last_issued_certification_date",
            )
        )


class CertificationCountReport(
    ExportMixin,
    SingleTableMixin,
    PermissionRequiredMixin,
    ListView,
):
    model = Certification
    permission_required = "paperwork.view_certification"
    template_name = "paperwork/certification_count_report.dj.html"
    table_class = CertificationCountTable
    export_formats = ("csv", "xlsx", "ods")

    def get_queryset(self):
        qs = super().get_queryset()
        return (
            qs.values(
                "certification_version__definition__name",
                "certification_version__definition__department__name",
            )
            .annotate(total_issued=Count("*"))
            .order_by("certification_version__definition__name")
        )