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.db import models
from django.db.models import Case, Q, 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 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,
    CertificationVersion,
    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"
                ),
            )
        )


class ShopAccessErrorColumn(tables.Column):
    def td_class(value):
        if value.startswith("Has access but"):
            return "table-danger"
        elif value.startswith("Has cert but"):
            return "table-warning"
        else:
            return ""

    attrs = {"td": {"class": td_class}}


class AccessVerificationTable(tables.Table):
    account_name = tables.Column()
    access_card = tables.Column()
    billing_method = tables.Column()
    join_date = tables.DateColumn()
    renewal_date = tables.DateColumn()
    access_front_door = tables.BooleanColumn(verbose_name="Front Door")
    access_studio_space = tables.BooleanColumn(verbose_name="Studio Space")
    wood_shop_error = ShopAccessErrorColumn()
    metal_shop_error = ShopAccessErrorColumn()
    extended_hours_error = ShopAccessErrorColumn()
    extended_hours_shops_error = ShopAccessErrorColumn()
    storage_closet_error = ShopAccessErrorColumn()


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):
        # TODO: could be done with subqueries if membershipworks was not a separate DB
        def shop_error(access_field: str, shop_name: str):
            member_list = list(
                CertificationVersion.objects.filter(
                    is_current=True,
                    definition__department__name=shop_name,
                    certification__member__pk__isnull=False,
                )
                .values_list(
                    "certification__member__pk",
                    flat=True,
                )
                .distinct()
            )
            return Case(
                When(
                    Q(**{access_field: True}) & ~Q(uid__in=member_list),
                    Value("Has access but no cert"),
                ),
                When(
                    Q(**{access_field: False}) & Q(uid__in=member_list),
                    Value("Has cert but no access"),
                ),
                default=None,
            )

        # TODO: could be a lot cleaner if membershipworks was not a separate DB
        storage_closet_members = (
            Member.objects.filter(
                Member.objects.has_flag("label", "Volunteer: Desker")
                | Q(billing_method__startswith="Desker")
            )
            .union(
                *[
                    department.shop_lead_flag.members.all()
                    for department in Department.objects.filter(
                        shop_lead_flag__isnull=False
                    )
                ]
            )
            .values_list("pk", flat=True)
        )

        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)
                        & ~Q(uid__in=storage_closet_members),
                        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