from decimal import Decimal

from django.contrib.auth import get_user_model
from django.test import TestCase
from django.urls import reverse

from inventory.models import Item, ItemTemplate
from inventory.services import PricingSuggestionService


User = get_user_model()


class ItemModelTests(TestCase):
    def setUp(self):
        self.user = User.objects.create_user(username="alice", password="password123")

    def test_profit_uses_costs_and_sale_price(self):
        item = Item.objects.create(
            created_by=self.user,
            title="Vintage jacket",
            category="Apparel",
            purchase_price=Decimal("10.00"),
            ebay_fee=Decimal("2.00"),
            shipping_cost=Decimal("4.00"),
            sold_price=Decimal("30.00"),
            status=Item.Status.SOLD,
        )

        self.assertEqual(item.total_cost, Decimal("16.00"))
        self.assertEqual(item.profit, Decimal("14.00"))


class ItemCreateViewTests(TestCase):
    def setUp(self):
        self.user = User.objects.create_user(username="alice", password="password123")
        self.template = ItemTemplate.objects.create(
            name="Blanket",
            category="Home",
            default_purchase_price=Decimal("8.00"),
            default_estimated_resale_price=Decimal("24.00"),
            default_notes="Check for stains.",
        )

    def test_template_defaults_are_applied_on_create(self):
        self.client.login(username="alice", password="password123")
        response = self.client.post(
            reverse("item-create"),
            {
                "template": self.template.id,
                "title": "Wool blanket",
                "brand": "Pendleton",
                "category": "",
                "condition": "Good",
                "size": "Queen",
                "color": "Red",
                "purchase_price": "",
                "estimated_resale_price": "",
                "notes": "",
            },
        )

        self.assertEqual(response.status_code, 302)
        item = Item.objects.get(title="Wool blanket")
        self.assertEqual(item.category, "Home")
        self.assertEqual(item.purchase_price, Decimal("8.00"))
        self.assertEqual(item.estimated_resale_price, Decimal("24.00"))
        self.assertEqual(item.notes, "Check for stains.")
        self.assertEqual(item.created_by, self.user)


class ItemWorkflowTests(TestCase):
    def setUp(self):
        self.user = User.objects.create_user(username="alice", password="password123")
        self.other_user = User.objects.create_user(username="bob", password="password123")
        self.item = Item.objects.create(
            created_by=self.user,
            title="Leather boots",
            category="Shoes",
            purchase_price=Decimal("20.00"),
        )

    def test_dashboard_filters_by_query(self):
        self.client.login(username="alice", password="password123")
        response = self.client.get(reverse("dashboard"), {"query": "boots"})

        self.assertContains(response, "Leather boots")

    def test_mark_item_sold_sets_status_and_sold_date(self):
        self.client.login(username="alice", password="password123")
        response = self.client.post(
            reverse("item-mark-sold", kwargs={"pk": self.item.pk}),
            {
                "sold_price": "55.00",
                "ebay_fee": "5.00",
                "shipping_cost": "7.00",
                "sold_at": "",
            },
        )

        self.assertEqual(response.status_code, 302)
        self.item.refresh_from_db()
        self.assertEqual(self.item.status, Item.Status.SOLD)
        self.assertEqual(self.item.sold_price, Decimal("55.00"))
        self.assertIsNotNone(self.item.sold_at)

    def test_editing_item_does_not_change_creator(self):
        self.client.login(username="bob", password="password123")
        response = self.client.post(
            reverse("item-edit", kwargs={"pk": self.item.pk}),
            {
                "template": "",
                "title": "Leather boots updated",
                "brand": "",
                "category": "Shoes",
                "condition": "",
                "size": "",
                "color": "",
                "purchase_price": "20.00",
                "estimated_resale_price": "",
                "notes": "Updated notes",
            },
        )

        self.assertEqual(response.status_code, 302)
        self.item.refresh_from_db()
        self.assertEqual(self.item.title, "Leather boots updated")
        self.assertEqual(self.item.created_by, self.user)


class TemplateAndPricingTests(TestCase):
    def setUp(self):
        self.user = User.objects.create_user(username="alice", password="password123")

    def test_template_edit_updates_existing_template(self):
        template = ItemTemplate.objects.create(name="Mugs", category="Kitchen")

        self.client.login(username="alice", password="password123")
        response = self.client.post(
            reverse("template-edit", kwargs={"pk": template.pk}),
            {
                "name": "Mugs and cups",
                "description": "Glassware",
                "category": "Kitchen",
                "default_purchase_price": "3.00",
                "default_estimated_resale_price": "12.00",
                "default_notes": "Check for chips.",
                "is_active": "on",
            },
        )

        self.assertEqual(response.status_code, 302)
        template.refresh_from_db()
        self.assertEqual(template.name, "Mugs and cups")
        self.assertEqual(template.default_purchase_price, Decimal("3.00"))

    def test_pricing_suggestion_uses_recent_sold_comps(self):
        sold_one = Item.objects.create(
            created_by=self.user,
            title="Blue sweater",
            category="Apparel",
            purchase_price=Decimal("10.00"),
        )
        sold_one.mark_sold(Decimal("40.00"))

        sold_two = Item.objects.create(
            created_by=self.user,
            title="Green sweater",
            category="Apparel",
            purchase_price=Decimal("12.00"),
        )
        sold_two.mark_sold(Decimal("60.00"))

        unsold = Item.objects.create(
            created_by=self.user,
            title="Striped sweater",
            category="Apparel",
            purchase_price=Decimal("15.00"),
        )

        suggestion = PricingSuggestionService().suggest_for_item(unsold)

        self.assertEqual(suggestion["price"], Decimal("50.00"))
        self.assertEqual(suggestion["source"], "Recent sold comps")