from decimal import Decimal
from unittest.mock import patch

from django.contrib.auth import get_user_model
from django.test import Client, TestCase, override_settings
from django.urls import reverse

from pos_sync.models import POSConnection, SyncEvent
from pos_sync.services import apply_inbound_sale, dispatch_pending_outbound, enqueue_online_sale
from shop.models import Product
from shop.services import add_to_cart, create_order_from_cart, mark_paid


class POSInboundTests(TestCase):
    def setUp(self):
        self.product = Product.objects.create(
            name="Booster pack",
            sku="TCG-PACK",
            price=Decimal("4.99"),
            stock_qty=10,
            is_published=True,
        )

    def test_inbound_sale_decrements_stock(self):
        event = apply_inbound_sale(sku="tcg-pack", quantity=3, external_id="pos-1")
        self.product.refresh_from_db()
        self.assertEqual(self.product.stock_qty, 7)
        self.assertEqual(event.status, SyncEvent.Status.DONE)

    @override_settings(POS_WEBHOOK_SECRET="pos-secret")
    def test_webhook_requires_secret_and_updates_stock(self):
        url = reverse("pos_sync:inventory_webhook")
        anon = Client().post(
            url,
            data='{"sku":"TCG-PACK","quantity":1}',
            content_type="application/json",
        )
        self.assertEqual(anon.status_code, 401)
        ok = Client().post(
            url,
            data='{"sku":"TCG-PACK","quantity":2,"external_id":"reg-9"}',
            content_type="application/json",
            HTTP_AUTHORIZATION="Bearer pos-secret",
        )
        self.assertEqual(ok.status_code, 200)
        self.product.refresh_from_db()
        self.assertEqual(self.product.stock_qty, 8)


class POSOutboundTests(TestCase):
    def setUp(self):
        self.product = Product.objects.create(
            name="Figure",
            sku="FIG-1",
            price=Decimal("12.00"),
            stock_qty=5,
            is_published=True,
        )
        self.connection = POSConnection.objects.create(
            name="Counter",
            api_base_url="https://pos.example.com",
            api_token="tok",
            is_active=True,
        )

    def test_paid_order_enqueues_outbound(self):
        session = self.client.session
        add_to_cart(session, self.product, 1)
        session.save()
        order = create_order_from_cart(self.client.session, email="a@example.com")
        mark_paid(order)
        event = SyncEvent.objects.get(direction=SyncEvent.Direction.OUTBOUND)
        self.assertEqual(event.sku, "FIG-1")
        self.assertEqual(event.status, SyncEvent.Status.PENDING)

    def test_dispatch_posts_reserve(self):
        enqueue_online_sale(
            type(
                "O",
                (),
                {
                    "number": "ORD-1",
                    "pk": "x",
                    "items": type(
                        "M",
                        (),
                        {
                            "all": lambda self: [
                                type("I", (), {"sku": "FIG-1", "quantity": 1})()
                            ]
                        },
                    )(),
                },
            )()
        )
        with patch("pos_sync.services.requests.post") as post:
            post.return_value.raise_for_status = lambda: None
            sent = dispatch_pending_outbound()
        self.assertEqual(sent, 1)
        post.assert_called_once()
        self.assertIn("/inventory/reserve", post.call_args.args[0])
        event = SyncEvent.objects.get()
        self.assertEqual(event.status, SyncEvent.Status.DONE)


class POSPortalTests(TestCase):
    def test_list_requires_login(self):
        self.assertEqual(Client().get(reverse("pos_sync:event_list")).status_code, 302)

    def test_list_ok_when_logged_in(self):
        User = get_user_model()
        User.objects.create_user("clerk", password="test-pass-123", is_staff=True)
        client = Client()
        client.login(username="clerk", password="test-pass-123")
        self.assertEqual(client.get(reverse("pos_sync:event_list")).status_code, 200)