// Package settings persists application-level key/value settings in the
// metadata layer. The main use is the token signing secret, generated on first
// use and reused afterwards.
package settings

import "context"

// JWTSecretKey is the settings key holding the token signing secret.
const JWTSecretKey = "jwt_secret"

// Repository reads and writes application settings.
type Repository interface {
	// Get returns the value for key and whether it exists.
	Get(ctx context.Context, key string) (string, bool, error)
	// Set stores or replaces the value for key.
	Set(ctx context.Context, key, value string) error
	// Ensure returns the existing value for key, or generates and stores one
	// using generate when absent. Concurrent first use yields one value.
	Ensure(ctx context.Context, key string, generate func() (string, error)) (string, error)
}