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 delete(cls, lines):
        pool = Pool()
        SaleLineDeleted = pool.get('sale.line_deleted')
        for line in lines:
            SaleLineDeleted.create([{
                'sale': line.sale,
                'quantity': line.quantity,
                'unit': line.unit,
                'product': line.product,
                'user': Transaction().user
            }])

        super(SaleLine, cls).delete(lines)


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

    __name__ = 'sale.line_deleted'

    sale = fields.Many2One(
        'sale.sale', "Sale", ondelete='CASCADE', required=True
    )

    quantity = fields.Float(
        "Quantity", digits='unit',
        # states={
        #     'invisible': Eval('type') != 'line',
        #     'required': Eval('type') == 'line',
        #     'readonly': Eval('sale_state') != 'draft',
        # }
    )

    unit = fields.Many2One('product.uom', 'Unit', ondelete='RESTRICT',)

    product = fields.Many2One('product.product', 'Product',
                              ondelete='RESTRICT',
                              )
    sale_date = fields.Date('Sale Date',)
    user = fields.Many2One(
        'res.user',
        'User'
    )