add telegram bot

internal/telegram/format.go

@@ -0,0 +1,146 @@
+package telegram
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"git.vakhrushev.me/av/remembos/internal/memos"
+	"git.vakhrushev.me/av/remembos/internal/search"
+)
+
+const (
+	maxMessageLen = 4096
+	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) {
+	var b strings.Builder
+
+	// Header: date and "ago" text
+	b.WriteString(fmt.Sprintf("<b>%s</b>", formatDate(mem.Date)))
+	if ago := agoText(mem.Date); ago != "" {
+		b.WriteString(fmt.Sprintf(" <i>(%s)</i>", ago))
+	}
+	b.WriteString("\n\n")
+
+	// Content
+	b.WriteString(escapeHTML(mem.Memo.Content))
+
+	// Tags
+	if len(mem.Memo.Tags) > 0 {
+		b.WriteString("\n\n")
+		tags := make([]string, len(mem.Memo.Tags))
+		for i, t := range mem.Memo.Tags {
+			tags[i] = "#" + t
+		}
+		b.WriteString(strings.Join(tags, " "))
+	}
+
+	// Link to original
+	memoURL := fmt.Sprintf("%s/%s", publicURL, mem.Memo.Name)
+	b.WriteString(fmt.Sprintf("\n\n<a href=\"%s\">Оригинал</a>", memoURL))
+
+	full := b.String()
+	mainText = truncateHTML(full, maxMessageLen)
+	captionText = truncateHTML(full, maxCaptionLen)
+	return mainText, captionText
+}
+
+// imageAttachments returns image attachments from the memo.
+func imageAttachments(memo *memos.Memo) []memos.Attachment {
+	var images []memos.Attachment
+	for _, att := range memo.Attachments {
+		if att.IsImage() {
+			images = append(images, att)
+		}
+	}
+	return images
+}
+
+// truncateHTML truncates text to maxLen, cutting at a word/line boundary and adding "...".
+func truncateHTML(text string, maxLen int) string {
+	if len(text) <= maxLen {
+		return text
+	}
+
+	// Reserve space for "..."
+	cut := maxLen - 3
+
+	// Find last newline or space before cut point
+	idx := strings.LastIndexAny(text[:cut], "\n ")
+	if idx <= 0 {
+		idx = cut
+	}
+
+	return text[:idx] + "..."
+}
+
+// escapeHTML escapes special HTML characters for Telegram HTML parse mode.
+func escapeHTML(s string) string {
+	s = strings.ReplaceAll(s, "&", "&amp;")
+	s = strings.ReplaceAll(s, "<", "&lt;")
+	s = strings.ReplaceAll(s, ">", "&gt;")
+	return s
+}
+
+var months = [...]string{
+	1: "января", 2: "февраля", 3: "марта",
+	4: "апреля", 5: "мая", 6: "июня",
+	7: "июля", 8: "августа", 9: "сентября",
+	10: "октября", 11: "ноября", 12: "декабря",
+}
+
+func formatDate(t time.Time) string {
+	return fmt.Sprintf("%d %s %d", t.Day(), months[t.Month()], t.Year())
+}
+
+func agoText(t time.Time) string {
+	now := time.Now()
+	years := now.Year() - t.Year()
+	monthsDiff := int(now.Month()) - int(t.Month())
+	if monthsDiff < 0 {
+		years--
+		monthsDiff += 12
+	}
+
+	if years > 0 {
+		return fmt.Sprintf("%s назад", pluralYears(years))
+	}
+	if monthsDiff > 0 {
+		return fmt.Sprintf("%s назад", pluralMonths(monthsDiff))
+	}
+	return ""
+}
+
+func pluralYears(n int) string {
+	mod10 := n % 10
+	mod100 := n % 100
+	switch {
+	case mod100 >= 11 && mod100 <= 14:
+		return fmt.Sprintf("%d лет", n)
+	case mod10 == 1:
+		return fmt.Sprintf("%d год", n)
+	case mod10 >= 2 && mod10 <= 4:
+		return fmt.Sprintf("%d года", n)
+	default:
+		return fmt.Sprintf("%d лет", n)
+	}
+}
+
+func pluralMonths(n int) string {
+	mod10 := n % 10
+	mod100 := n % 100
+	switch {
+	case mod100 >= 11 && mod100 <= 14:
+		return fmt.Sprintf("%d месяцев", n)
+	case mod10 == 1:
+		return fmt.Sprintf("%d месяц", n)
+	case mod10 >= 2 && mod10 <= 4:
+		return fmt.Sprintf("%d месяца", n)
+	default:
+		return fmt.Sprintf("%d месяцев", n)
+	}
+}