from django.contrib import admin
from django.contrib.humanize.templatetags.humanize import naturaltime
from django.http import HttpRequest
from django.utils.html import format_html

from django_object_actions import (
    DjangoObjectActions,
    action,
    takes_instance_or_queryset,
)
from django_q.models import Task
from django_q.tasks import async_task
from simple_history.admin import SimpleHistoryAdmin

from .models import (
    Event,
    EventExt,
    EventInstructor,
    EventInvoice,
    EventMeetingTime,
    Flag,
    Member,
    Transaction,
)
from .tasks.scrape import scrape_event_details, scrape_membershipworks
from .tasks.ucsAccounts import sync_accounts


class TaskLabel:
    def __init__(self, label: str, task) -> None:
        self.label = label
        self.task = task

    def __str__(self) -> str:
        try:
            last_run = naturaltime(
                Task.objects.filter(group=self.task.q_task_group)
                .values_list("started", flat=True)
                .latest("started")
            )
        except Task.DoesNotExist:
            last_run = "Never"
        return f"{self.label} [Last Run {last_run}]"


def run_task_action(admin: admin.ModelAdmin, label: str, task):
    @action(label=TaskLabel(label, task))
    def action_func(request, obj):
        async_task(task, group=task.q_task_group)
        admin.message_user(
            request,
            "Queued task, please wait a few seconds/minutes then refresh the page",
        )

    return action_func


class ReadOnlyAdminMixin:
    def has_add_permission(self, request, obj=None):
        return False

    def has_change_permission(self, request, obj=None):
        return False

    def has_delete_permission(self, request, obj=None):
        return False


class BaseMembershipWorksAdmin(
    DjangoObjectActions, ReadOnlyAdminMixin, SimpleHistoryAdmin
):
    changelist_actions = ("refresh_membershipworks_data", "sync_ucs_accounts")

    @property
    def refresh_membershipworks_data(self):
        return run_task_action(self, "Refresh Data", scrape_membershipworks)

    @property
    def sync_ucs_accounts(self):
        return run_task_action(self, "Sync UCS Accounts", sync_accounts)


class MemberFlagInline(admin.TabularInline):
    model = Member.flags.through


@admin.register(Member)
class MemberAdmin(BaseMembershipWorksAdmin):
    search_fields = ["^first_name", "^last_name", "^account_name"]
    inlines = [MemberFlagInline]


@admin.register(Flag)
class FlagAdmin(BaseMembershipWorksAdmin):
    inlines = [MemberFlagInline]
    list_display = ["name", "type"]
    list_filter = ["type"]
    show_facets = admin.ShowFacets.ALWAYS
    search_fields = ["name"]


@admin.register(Transaction)
class TransactionAdmin(BaseMembershipWorksAdmin):
    list_display = ["timestamp", "member", "name", "type", "sum", "note"]
    list_select_related = ["member"]
    list_filter = ["type"]
    show_facets = admin.ShowFacets.ALWAYS
    search_fields = ["member", "name", "type", "note"]
    date_hierarchy = "timestamp"


class EventMeetingTimeInline(admin.TabularInline):
    model = EventMeetingTime
    fields = ["start", "end", "duration", "resources"]
    readonly_fields = ["duration"]
    autocomplete_fields = ["resources"]
    extra = 0
    min_num = 1


@admin.register(EventInstructor)
class EventInstructorAdmin(admin.ModelAdmin):
    autocomplete_fields = ["member"]
    search_fields = ["name", "member__account_name"]
    list_select_related = ["member"]


@admin.register(EventInvoice)
class EventInvoiceAdmin(admin.ModelAdmin):
    model = EventInvoice
    list_display = [
        "uuid",
        "event",
        "event__start",
        "event__end",
        "event__instructor",
        "date_submitted",
        "date_paid",
        "amount",
    ]
    list_select_related = ["event__instructor__member"]
    list_filter = [
        ("date_paid", admin.EmptyFieldListFilter),
    ]
    show_facets = admin.ShowFacets.ALWAYS
    search_fields = [
        "uuid",
        "event__eid",
        "event__title",
        "event__url",
        "event__instructor__name",
        "event__instructor__member__account_name",
    ]
    date_hierarchy = "date_submitted"


class EventInvoiceInline(admin.StackedInline):
    model = EventInvoice


@admin.register(EventExt)
class EventAdmin(DjangoObjectActions, admin.ModelAdmin):
    inlines = [EventInvoiceInline, EventMeetingTimeInline]
    list_display = [
        "unescaped_title",
        "start",
        "duration",
        "count",
        "cap",
        "category",
    ]
    list_filter = [
        "category",
        "calendar",
        "venue",
        ("materials_fee", admin.EmptyFieldListFilter),
    ]
    show_facets = admin.ShowFacets.ALWAYS
    search_fields = ["eid", "title", "url"]
    date_hierarchy = "start"
    exclude = ["url", "details", "registrations"]
    autocomplete_fields = ["instructor"]
    change_actions = ["fetch_details"]
    actions = ["fetch_details"]

    def get_readonly_fields(self, request: HttpRequest, obj: EventExt) -> list[str]:
        fields = []
        for field in Event._meta.get_fields():
            if field.auto_created or field.many_to_many or not field.concrete:
                continue
            elif field.name == "url":
                fields.append("_url")
            else:
                fields.append(field.name)
        fields.insert(fields.index("end") + 1, "duration")
        fields.append("details_timestamp")
        return fields

    @admin.display(ordering="title")
    def unescaped_title(self, obj):
        return obj.unescaped_title

    @admin.display(ordering="duration")
    def duration(self, obj):
        return obj.duration

    @admin.display(description="URL")
    def _url(self, obj):
        return format_html(
            '<a href="https://claremontmakerspace.org/events/#!event/{0}">{0}</a>',
            obj.url,
        )

    @takes_instance_or_queryset
    def fetch_details(self, request, queryset):
        scrape_event_details(queryset)

    def has_add_permission(self, request, obj=None):
        return False

    def has_delete_permission(self, request, obj=None):
        return False


@admin.register(EventMeetingTime)
class EventMeetingTimeAdmin(admin.ModelAdmin):
    def has_module_permission(self, request: HttpRequest) -> bool:
        return False