Split long messages when send to telegram

internal/adapter/telegram/sender.go

@@ -6,6 +6,10 @@ import (
 	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
 )
 
+const (
+	TextLengthLimit = 4000
+)
+
 type TelegramMessageSender struct {
 	bot    *tgbotapi.BotAPI
 	logger *slog.Logger
@@ -24,6 +28,32 @@ func NewTelegramMessageSender(botToken string, logger *slog.Logger) (*TelegramMe
 }
 
 func (s *TelegramMessageSender) Send(text string, chatId int64, replyToMessageId *int) error {
+	// If message is short enough, send it directly
+	if len([]rune(text)) <= TextLengthLimit {
+		return s.sendSingleMessage(text, chatId, replyToMessageId)
+	}
+
+	// Split long message into parts
+	parts := s.splitMessageByWords(text, TextLengthLimit)
+
+	// Send each part
+	for i, part := range parts {
+		var replyId *int
+		// Only use replyToMessageId for the first part
+		if i == 0 {
+			replyId = replyToMessageId
+		}
+		err := s.sendSingleMessage(part, chatId, replyId)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// sendSingleMessage sends a single message
+func (s *TelegramMessageSender) sendSingleMessage(text string, chatId int64, replyToMessageId *int) error {
 	resultMsg := tgbotapi.NewMessage(chatId, text)
 	if replyToMessageId != nil {
 		resultMsg.ReplyToMessageID = *replyToMessageId