fix long text in telegram

internal/telegram/format.go

@@ -14,9 +14,9 @@ const (
 	maxCaptionLen = 1024
 )
 
-// formatMemory returns (mainText, captionText) formatted as HTML for Telegram.
-// mainText is for sendMessage (up to 4096 chars), captionText for photo captions (up to 1024 chars).
-func formatMemory(mem *search.Memory, publicURL string) (mainText, captionText string) {
+// formatMemory returns the full message text formatted as HTML for Telegram.
+// The text is NOT truncated — the caller is responsible for splitting if needed.
+func formatMemory(mem *search.Memory, publicURL string) string {
 	var b strings.Builder
 
 	// Header: date and "ago" text
@@ -43,10 +43,7 @@ func formatMemory(mem *search.Memory, publicURL string) (mainText, captionText s
 	memoURL := fmt.Sprintf("%s/%s", publicURL, mem.Memo.Name)
 	b.WriteString("\n\n<a href=\"" + memoURL + "\">Оригинал</a>")
 
-	full := b.String()
-	mainText = truncateHTML(full, maxMessageLen)
-	captionText = truncateHTML(full, maxCaptionLen)
-	return mainText, captionText
+	return b.String()
 }
 
 // imageAttachments returns image attachments from the memo.
@@ -60,22 +57,43 @@ func imageAttachments(memo *memos.Memo) []memos.Attachment {
 	return images
 }
 
-// truncateHTML truncates text to maxLen, cutting at a word/line boundary and adding "...".
-func truncateHTML(text string, maxLen int) string {
+// splitText splits text into chunks of at most maxLen bytes,
+// breaking at paragraph (\n\n), line (\n), or word boundaries.
+func splitText(text string, maxLen int) []string {
 	if len(text) <= maxLen {
-		return text
+		return []string{text}
 	}
 
-	// Reserve space for "..."
-	cut := maxLen - 3
+	var parts []string
+	remaining := text
 
-	// Find last newline or space before cut point
-	idx := strings.LastIndexAny(text[:cut], "\n ")
-	if idx <= 0 {
-		idx = cut
+	for len(remaining) > maxLen {
+		chunk := remaining[:maxLen]
+
+		// Try to break at a paragraph boundary
+		idx := strings.LastIndex(chunk, "\n\n")
+		if idx <= 0 {
+			// Try a line boundary
+			idx = strings.LastIndex(chunk, "\n")
+		}
+		if idx <= 0 {
+			// Try a word boundary
+			idx = strings.LastIndexByte(chunk, ' ')
+		}
+		if idx <= 0 {
+			// Hard cut as last resort
+			idx = maxLen
+		}
+
+		parts = append(parts, remaining[:idx])
+		remaining = strings.TrimLeft(remaining[idx:], "\n ")
 	}
 
-	return text[:idx] + "..."
+	if remaining != "" {
+		parts = append(parts, remaining)
+	}
+
+	return parts
 }
 
 // escapeHTML escapes special HTML characters for Telegram HTML parse mode.