#This file is part of Tryton.  The COPYRIGHT file at the top level of
#this repository contains the full copyright notices and license terms.

from trytond.model.fields.field import Field
from trytond.pyson import PYSON

def digits_validate(value):
    if value:
        assert isinstance(value, tuple), 'digits must be a tuple'
        for i in value:
            assert isinstance(i, (int, long, PYSON)), \
                    'digits must be tuple of integers or PYSON'
            if isinstance(i, PYSON):
                assert i.types().issubset(set([int, long])), \
                        'PYSON digits must return an integer'


class Float(Field):
    '''
    Define a float field (``float``).
    '''
    _type = 'float'

    def __init__(self, string='', digits=None,  help='', required=False,
            readonly=False, domain=None, states=None, change_default=False,
            select=False, on_change=None, on_change_with=None, depends=None,
            order_field=None, context=None, loading='eager'):
        '''
        :param digits: a list of two integers defining the total
            of digits and the number of decimals of the float.
        '''
        super(Float, self).__init__(string=string, help=help,
                required=required, readonly=readonly, domain=domain,
                states=states, change_default=change_default, select=select,
                on_change=on_change, on_change_with=on_change_with,
                depends=depends, order_field=order_field, context=context,
                loading=loading)
        self.__digits = None
        self.digits = digits

    __init__.__doc__ += Field.__init__.__doc__

    def _get_digits(self):
        return self.__digits

    def _set_digits(self, value):
        digits_validate(value)
        self.__digits = value

    digits = property(_get_digits, _set_digits)
