# Check if a field is a Float
#
# ~~~
# var validator = new ObjectValidator
# validator.add new FloatField("field", required=false)
# assert validator.validate("""{}""")
#
# validator = new ObjectValidator
# validator.add new FloatField("field")
# assert not validator.validate("""{}""")
# assert not validator.validate("""{ "field": "foo" }""")
# assert validator.validate("""{ "field": 10.5 }""")
#
# validator = new ObjectValidator
# validator.add new FloatField("field", min=3.0)
# assert validator.validate("""{ "field": 3.0 }""")
# assert not validator.validate("""{ "field": 2.0 }""")
#
# validator = new ObjectValidator
# validator.add new FloatField("field", max=3.0)
# assert validator.validate("""{ "field": 3.0 }""")
# assert not validator.validate("""{ "field": 4.0 }""")
#
# validator = new ObjectValidator
# validator.add new FloatField("field", min=3.0, max=5.0)
# assert not validator.validate("""{ "field": 2.0 }""")
# assert validator.validate("""{ "field": 3.0 }""")
# assert validator.validate("""{ "field": 5.0 }""")
# assert not validator.validate("""{ "field": 6.0 }""")
# ~~~
class FloatField
	super RequiredField

	# Min value (default: not checked)
	var min: nullable Float

	# Max value (default: not checked)
	var max: nullable Float

	redef fun validate_field(v, obj) do
		if not super then return false
		var val = obj.get_or_null(field)
		if val == null then
			if required == null or required == true then
				v.validation.add_error(field, "Expected Float got `null`")
				return false
			else
				return true
			end
		end
		if not val isa Float then
			v.validation.add_error(field, "Expected Float got `{val.class_name}`")
			return false
		end
		var min = self.min
		if min != null and val < min then
			v.validation.add_error(field, "Must be smaller or equal to `{min}`")
			return false
		end
		var max = self.max
		if max != null and val > max then
			v.validation.add_error(field, "Must be greater or equal to `{max}`")
			return false
		end
		return true
	end
end