import string
from django.shortcuts import resolve_url
from django import forms
from django.contrib import admin
from django.contrib import messages
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import User
from django.utils.translation import ugettext as _
from django.utils.html import format_html
import django_lcore
import lcoreapi

from lambdainst.models import VPNUser
from payments.admin import UserCouponInline, UserLedgerInline


def make_user_link(user):
    change_url = resolve_url("admin:auth_user_change", user.id)
    return format_html('<a href="{}">{}</a>', change_url, user.username)


class VPNUserInline(admin.StackedInline):
    model = VPNUser
    can_delete = False
    fk_name = "user"

    fields = (
        "notes",
        "expiration",
        "last_expiry_notice",
        "notify_expiration",
        "last_vpn_auth_fail_notice",
        "notify_vpn_auth_fail",
        "trial_periods_given",
        "referrer_a",
        "campaign",
        "last_vpn_auth",
        "last_core_sync",
    )
    readonly_fields = ("referrer_a", "last_vpn_auth", "last_core_sync", "campaign")

    def referrer_a(self, object):
        if not object.referrer:
            return "-"

        s = make_user_link(object.referrer) + " "
        if object.referrer_used:
            s += _("(rewarded)")
        else:
            s += _("(not rewarded)")
        return s

    referrer_a.allow_tags = True
    referrer_a.short_description = _("Referrer")

    def is_paid(self, object):
        return object.is_paid

    is_paid.boolean = True
    is_paid.short_description = _("Is paid?")


class UserAdmin(UserAdmin):
    inlines = (VPNUserInline, UserLedgerInline, UserCouponInline)
    list_display = ("username", "email", "is_staff", "date_joined", "is_paid")
    ordering = ("-date_joined",)
    fieldsets = (
        (None, {"fields": ("username", "password", "email", "links")}),
        (_("Important dates"), {"fields": ("last_login", "date_joined")}),
        (
            _("Permissions"),
            {
                "fields": (
                    "is_active",
                    "is_staff",
                    "is_superuser",
                    "groups",
                    "user_permissions",
                )
            },
        ),
    )
    readonly_fields = ("last_login", "date_joined", "links")
    actions = (django_lcore.core_sync_action,)

    def is_paid(self, object):
        return object.vpnuser.is_paid

    is_paid.boolean = True
    is_paid.short_description = _("Is paid?")

    def links(self, object):
        payments_url = resolve_url("admin:payments_payment_changelist")
        tickets_url = resolve_url("admin:tickets_ticket_changelist")
        fmt = '<a href="{}?user__id__exact={}">{}</a>'
        return format_html(
            fmt + " - " + fmt,
            payments_url,
            object.id,
            "Payments",
            tickets_url,
            object.id,
            "Tickets",
        )

    def save_model(self, request, obj, form, change):
        super().save_model(request, obj, form, change)

        # Notify core
        if change:
            django_lcore.sync_user(obj.vpnuser)

    def delete_model(self, request, obj):
        try:
            django_lcore.api.get_user(obj.username).delete()
        except lcoreapi.APIError as e:
            messages.error(request, "failed to delete vpn user: %r" % e)

        super().delete_model(request, obj)


admin.site.unregister(User)
admin.site.register(User, UserAdmin)