package hasher

import (
	"git.andreafazzi.eu/andrea/probo/client"
)

type HashFunc func(string) string

type Hasher interface {
	// Hash returns a slice of hashes. The first one is an
	// hash calculated from the question using
	// QuestionHash. Following hashes are calculated from the
	// answers using AnswerHash.
	QuizHashes(quiz *client.Quiz) []string

	// QuestionHash returns an hash calculated from a field of
	// Question struct.
	QuestionHash(question *client.Question) string

	// AnswerHash returns an hash calculated from a field of
	// Answer struct.
	AnswerHash(answer *client.Answer) string

	// Calculate calculates a checksum from all the given hashes.
	Calculate(hashes []string) string
}