const (
	// StorePermsPrefix is the internal prefix of the storage layer dedicated to storing user data.
	StorePermsPrefix = "/2"

	// RootRoleName is the name of the ROOT role, with privileges to manage the cluster.
	RootRoleName = "root"

	// GuestRoleName is the name of the role that defines the privileges of an unauthenticated user.
	GuestRoleName = "guest"
)

type Error struct {
	Status int
	Errmsg string
}

type PasswordStore interface {
	CheckPassword(user User, password string) bool
	HashPassword(password string) (string, error)
}

type Permissions struct {
	KV RWPermission `json:"kv"`
}

type RWPermission struct {
	Read  []string `json:"read"`
	Write []string `json:"write"`
}

type Role struct {
	Role        string       `json:"role"`
	Permissions Permissions  `json:"permissions"`
	Grant       *Permissions `json:"grant,omitempty"`
	Revoke      *Permissions `json:"revoke,omitempty"`
}

type Store interface {
	AllUsers() ([]string, error)
	GetUser(name string) (User, error)
	CreateOrUpdateUser(user User) (out User, created bool, err error)
	CreateUser(user User) (User, error)
	DeleteUser(name string) error
	UpdateUser(user User) (User, error)
	AllRoles() ([]string, error)
	GetRole(name string) (Role, error)
	CreateRole(role Role) error
	DeleteRole(name string) error
	UpdateRole(role Role) (Role, error)
	AuthEnabled() bool
	EnableAuth() error
	DisableAuth() error
	PasswordStore
}

type User struct {
	User     string   `json:"user"`
	Password string   `json:"password,omitempty"`
	Roles    []string `json:"roles"`
	Grant    []string `json:"grant,omitempty"`
	Revoke   []string `json:"revoke,omitempty"`
}