from decimal import Decimal
from app.services import product_service
from app.services import stock_service
from app.schemas.product import ProductCreate
from app.schemas.stock_movement import StockMoveRequest


def test_stock_increase(db):
    prod = product_service.create_product(
        db,
        ProductCreate(sku="STOCK-001", name="Test", price=Decimal("10.00"), current_stock=5),
    )
    req = StockMoveRequest(product_id=prod.id, type="IN", quantity=10, reason="Compra")
    mov, err = stock_service.register_movement(db, req)
    assert err == ""
    assert mov is not None
    db.refresh(prod)
    assert prod.current_stock == 15


def test_stock_decrease(db):
    prod = product_service.create_product(
        db,
        ProductCreate(sku="STOCK-002", name="Test", price=Decimal("10.00"), current_stock=20),
    )
    req = StockMoveRequest(product_id=prod.id, type="OUT", quantity=5, reason="Venta")
    mov, err = stock_service.register_movement(db, req)
    assert err == ""
    db.refresh(prod)
    assert prod.current_stock == 15


def test_stock_insufficient(db):
    prod = product_service.create_product(
        db,
        ProductCreate(sku="STOCK-003", name="Test", price=Decimal("10.00"), current_stock=3),
    )
    req = StockMoveRequest(product_id=prod.id, type="OUT", quantity=10, reason="Over sale")
    mov, err = stock_service.register_movement(db, req)
    assert err == "Stock insuficiente"
    assert mov is None


def test_stock_adjust(db):
    prod = product_service.create_product(
        db,
        ProductCreate(sku="STOCK-004", name="Test", price=Decimal("10.00"), current_stock=50),
    )
    req = StockMoveRequest(product_id=prod.id, type="ADJUST", quantity=100, reason="Inventario")
    mov, err = stock_service.register_movement(db, req)
    assert err == ""
    db.refresh(prod)
    assert prod.current_stock == 100


def test_stock_summary(db):
    prod1 = product_service.create_product(
        db,
        ProductCreate(sku="SUM-001", name="Prod 1", price=Decimal("1.00"), min_stock=10, current_stock=5),
    )
    prod2 = product_service.create_product(
        db,
        ProductCreate(sku="SUM-002", name="Prod 2", price=Decimal("2.00"), min_stock=5, current_stock=20),
    )
    summary = stock_service.get_stock_summary(db)
    assert len(summary) == 2
    low_stock = [s for s in summary if s["is_low_stock"]]
    assert len(low_stock) == 1
    assert low_stock[0]["product_id"] == prod1.id