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
	MUTE_MEMBERS      int64 = 1 << 11
	CREATE_INSTANT_INVITE int64 = 1 << 12
	CHANGE_NICKNAME   int64 = 1 << 13
	MANAGE_NICKNAMES  int64 = 1 << 14
	MANAGE_ROLES      int64 = 1 << 15
	MANAGE_WEBHOOKS   int64 = 1 << 16
	EMBED_LINKS       int64 = 1 << 17
	ATTACH_FILES      int64 = 1 << 18
	ADD_REACTIONS     int64 = 1 << 19
	USE_EXTERNAL_EMOJIS int64 = 1 << 20
	MENTION_EVERYONE  int64 = 1 << 21
)

// DefaultEveryonePermissions is granted to the @everyone role when a server is created.
// VIEW_CHANNEL | SEND_MESSAGES | CONNECT_VOICE | SPEAK_VOICE | SHARE_SCREEN | CREATE_INSTANT_INVITE | EMBED_LINKS | ATTACH_FILES | ADD_REACTIONS = bits 0,1,8,9,10,12,17,18,19.
const DefaultEveryonePermissions int64 = VIEW_CHANNEL | SEND_MESSAGES | CONNECT_VOICE | SPEAK_VOICE | SHARE_SCREEN | CREATE_INSTANT_INVITE | EMBED_LINKS | ATTACH_FILES | ADD_REACTIONS

// 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
}