from odoo import fields, models, _, api
from odoo.tools import float_round, float_compare
from odoo.exceptions import ValidationError, UserError


class StockQuant(models.Model):
    _inherit = "stock.quant"

    @api.constrains("product_id", "quantity")
    def check_negative_qty(self):
        if self.env.context.get("skip_negative_qty_check"):
            return
        p = self.env["decimal.precision"].precision_get("Product Unit of Measure")


        for quant in self:
            if (
                float_compare(quant.quantity, 0, precision_digits=p) == -1
                and quant.product_id.type == "consu"
                and quant.location_id.usage in ["internal", "transit"]
            ):
                msg_add = ""
                if quant.lot_id:
                    msg_add = _(" lot {}").format(quant.lot_id.name_get()[0][1])
                raise ValidationError(
                    _(
                        "You cannot validate this stock operation because the "
                        "stock level of the product '{name}'{name_lot} would "
                        "become negative "
                        "({q_quantity}) on the stock location '{complete_name}' "
                        "and negative stock is "
                        "not allowed for this product and/or location."
                    ).format(
                        name=quant.product_id.display_name,
                        name_lot=msg_add,
                        q_quantity=quant.quantity,
                        complete_name=quant.location_id.complete_name,
                    )
                )