from trytond.pool import PoolMeta, Pool
from trytond.model import fields, ModelSQL, ModelView
from trytond.transaction import Transaction


class Sale(metaclass=PoolMeta):
    __name__ = 'sale.sale'

    delete_lines = fields.One2Many(
        'sale.line_deleted', 'sale', "Delete lines",
        states={
            'readonly': True
        })


class SaleLine(metaclass=PoolMeta):
    __name__ = 'sale.line'

    @classmethod
    def _create_sale_line_deleted_log(cls, line):
        pool = Pool()
        SaleLineDeleted = pool.get('sale.line_deleted')

        SaleLineDeleted.create([{
            'sale': line.sale,
            'quantity': line.quantity,
            'unit': line.unit,
            'product': line.product,
            'user': Transaction().user
        }])


class SaleLineDeleted(ModelSQL, ModelView):
    'Register lines deleted in sale'

    __name__ = 'sale.line_deleted'

    _state = states = {
        'readonly': True
    }

    sale = fields.Many2One(
        'sale.sale', "Sale", ondelete='CASCADE', required=True, states=_state)
    quantity = fields.Float(
        "Quantity", digits='unit', states=_state)
    unit = fields.Many2One(
        'product.uom', 'Unit', ondelete='RESTRICT', states=_state)
    product = fields.Many2One(
        'product.product', 'Product',
        ondelete='RESTRICT', states=_state)
    sale_date = fields.Date(
        'Sale Date',
        states=_state
    )
    user = fields.Many2One(
        'res.user', 'User', states=_state)