implement class ChatFullInfo

bot.go

@@ -1051,7 +1051,7 @@ func (b *Bot) ChatByID(id int64) (*Chat, error) {
 }
 
 // ChatByUsername fetches chat info by its username.
-func (b *Bot) ChatByUsername(name string) (*Chat, error) {
+func (b *Bot) ChatByUsername(name string) (*ChatFullInfo, error) {
 	params := map[string]string{
 		"chat_id": name,
 	}

chat.go

@@ -45,6 +45,20 @@ type Chat struct {
 	FirstName string `json:"first_name"`
 	LastName  string `json:"last_name"`
 	Username  string `json:"username"`
+}
+
+type ChatFullInfo struct {
+	ID int64 `json:"id"`
+
+	// See ChatType and consts.
+	Type ChatType `json:"type"`
+
+	// Won't be there for ChatPrivate.
+	Title string `json:"title"`
+
+	FirstName string `json:"first_name"`
+	LastName  string `json:"last_name"`
+	Username  string `json:"username"`
 
 	// Returns only in getChat
 	Bio                      string        `json:"bio,omitempty"`
@@ -332,7 +346,7 @@ func (r ChatJoinRequest) Time() time.Time {
 }
 
 // Time returns the moment of the emoji status expiration.
-func (c *Chat) Time() time.Time {
+func (c *ChatFullInfo) Time() time.Time {
 	return time.Unix(c.EmojiExpirationUnixtime, 0)
 }