from decimal import Decimal

from django.contrib.auth import get_user_model
from django.core import mail
from django.test import Client, TestCase
from django.urls import reverse
from django.utils import timezone

from events.models import Event, Ticket, TicketOrder
from events.services import EventsError, create_ticket_order, mark_paid


def _event(**kwargs):
    defaults = dict(
        title="Friday Night Prerelease",
        starts_at=timezone.now() + timezone.timedelta(days=7),
        venue="Main shop",
        capacity=8,
        price=Decimal("25.00"),
        is_published=True,
    )
    defaults.update(kwargs)
    return Event.objects.create(**defaults)


class EventPublicTests(TestCase):
    def test_list_hides_drafts_and_past(self):
        _event(title="Live prerelease")
        _event(title="Draft night", is_published=False)
        _event(
            title="Last week",
            starts_at=timezone.now() - timezone.timedelta(days=2),
        )
        response = Client().get(reverse("events:list"))
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "Live prerelease")
        self.assertNotContains(response, "Draft night")
        self.assertNotContains(response, "Last week")

    def test_buy_form_renders(self):
        event = _event()
        response = Client().get(reverse("events:buy", kwargs={"slug": event.slug}))
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "Pay with Stripe")


class EventCapacityTests(TestCase):
    def test_capacity_blocks_overbook(self):
        event = _event(capacity=2)
        create_ticket_order(event, email="a@example.com", quantity=2)
        with self.assertRaises(EventsError):
            create_ticket_order(event, email="b@example.com", quantity=1)

    def test_mark_paid_issues_tickets_and_email(self):
        event = _event(capacity=4)
        order = create_ticket_order(
            event, email="fan@example.com", customer_name="Lee", quantity=2
        )
        mark_paid(order)
        order.refresh_from_db()
        self.assertEqual(order.status, TicketOrder.Status.PAID)
        self.assertEqual(Ticket.objects.filter(order=order).count(), 2)
        self.assertEqual(event.tickets_sold, 2)
        self.assertEqual(len(mail.outbox), 1)
        self.assertIn(event.title, mail.outbox[0].subject)


class EventPortalTests(TestCase):
    def setUp(self):
        User = get_user_model()
        self.user = User.objects.create_user("host", password="test-pass-123", is_staff=True)
        self.client = Client()
        self.client.login(username="host", password="test-pass-123")

    def test_list_requires_login(self):
        self.assertEqual(Client().get(reverse("events_portal:event_list")).status_code, 302)

    def test_create_published_event(self):
        starts = (timezone.now() + timezone.timedelta(days=3)).strftime("%Y-%m-%dT%H:%M")
        response = self.client.post(
            reverse("events_portal:event_new"),
            {
                "title": "Commander night",
                "starts_at": starts,
                "venue": "Back room",
                "capacity": "16",
                "price": "10.00",
                "is_published": "on",
            },
        )
        self.assertEqual(response.status_code, 302)
        event = Event.objects.get()
        self.assertEqual(event.slug, "commander-night")
        self.assertTrue(event.is_published)
        self.assertEqual(event.capacity, 16)