// Package allergies provides allergy related functions.
package allergies
const (
	allergyEggs = 1 << iota
	allergyPeanuts
	allergyShellfish
	allergyStrawberries
	allergyTomatoes
	allergyChocolate
	allergyPollen
	allergyCats
)
var allergies = []struct {
	name  string
	value uint
}{
	{"eggs", allergyEggs},
	{"peanuts", allergyPeanuts},
	{"shellfish", allergyShellfish},
	{"strawberries", allergyStrawberries},
	{"tomatoes", allergyTomatoes},
	{"chocolate", allergyChocolate},
	{"pollen", allergyPollen},
	{"cats", allergyCats},
}
// Allergies returs a slice of allergies based on score.
func Allergies(score uint) []string {
	out := []string{}
	for _, alg := range allergies {
		if score&alg.value != 0 {
			out = append(out, alg.name)
		}
	}
	return out
}
// AllergicTo returns true if substance is in score. False otherwise.
func AllergicTo(score uint, substance string) bool {
	for i := range allergies {
		if substance == allergies[i].name &&
			score&allergies[i].value != 0 {
			return true
		}
	}
	return false
}