from marshmallow import Schema, fields, ValidationError


def non_neg(value):
    if not value >= 0:
        raise ValidationError('Value cannot be negative')


def non_neg_non_zero(value):
    if not value > 0:
        raise ValidationError('Value cannot be negative or zero')


class CookieSchema(Schema):
    id = fields.Int(dump_only=True)
    created_date = fields.DateTime(dump_only=True)
    modified_date = fields.DateTime()
    name = fields.Str(required=True, error_messages={'required': "Cookie name is required"})
    recipe_url = fields.Str()
    sku = fields.Str(required=True, error_messages={'required': "Cookie sku is required"})
    qoh = fields.Int(validate=non_neg, required=True, error_messages={'required': "Cookie qoh is required"})
    unit_cost = fields.Decimal(validate=non_neg_non_zero, required=True, error_messages={'required': "Cookie unit_cost is required"})

    class Meta:
        ordered = True