package permissions

// Permission bitflags.
const (
	VIEW_CHANNEL    int64 = 1 << 0
	SEND_MESSAGES   int64 = 1 << 1
	MANAGE_MESSAGES int64 = 1 << 2
	KICK_MEMBERS    int64 = 1 << 3
	BAN_MEMBERS     int64 = 1 << 4
	MANAGE_SERVER   int64 = 1 << 5
	MANAGE_CHANNELS int64 = 1 << 6
	ADMINISTRATOR   int64 = 1 << 7
	CONNECT_VOICE   int64 = 1 << 8
	SPEAK_VOICE     int64 = 1 << 9
	SHARE_SCREEN    int64 = 1 << 10
)

// DefaultEveryonePermissions is granted to the @everyone role when a server is created.
// Bits 0,1,8,9,10 = VIEW_CHANNEL | SEND_MESSAGES | CONNECT_VOICE | SPEAK_VOICE | SHARE_SCREEN = 1539.
const DefaultEveryonePermissions int64 = VIEW_CHANNEL | SEND_MESSAGES | CONNECT_VOICE | SPEAK_VOICE | SHARE_SCREEN

// Has reports whether the permission set contains the given permission bits.
func Has(permissions int64, perm int64) bool {
	return permissions&perm == perm
}

// Add returns permissions with the given bits set.
func Add(permissions int64, perm int64) int64 {
	return permissions | perm
}

// Remove returns permissions with the given bits cleared.
func Remove(permissions int64, perm int64) int64 {
	return permissions &^ perm
}