chore: import clean Agent Desk snapshot (2/7)

internal/ai/language.go

@@ -0,0 +1,53 @@
+package ai
+
+import (
+	"unicode"
+)
+
+// DetectLanguage inspects a text and returns the predominant language: "ru", "zh", or "en".
+func DetectLanguage(text string) string {
+	cyrillicCount := 0
+	hanCount := 0
+	latinCount := 0
+
+	for _, r := range text {
+		if unicode.Is(unicode.Cyrillic, r) {
+			cyrillicCount++
+		} else if unicode.Is(unicode.Han, r) {
+			hanCount++
+		} else if unicode.Is(unicode.Latin, r) {
+			latinCount++
+		}
+	}
+
+	if cyrillicCount > 0 && cyrillicCount >= hanCount {
+		return "ru"
+	}
+	if hanCount > 0 && hanCount > cyrillicCount {
+		return "zh"
+	}
+	if latinCount > 0 {
+		return "en"
+	}
+	return "en"
+}
+
+// IsCyrillic returns true if the string contains at least one Cyrillic rune.
+func IsCyrillic(text string) bool {
+	for _, r := range text {
+		if unicode.Is(unicode.Cyrillic, r) {
+			return true
+		}
+	}
+	return false
+}
+
+// IsHan returns true if the string contains at least one Han (Chinese) rune.
+func IsHan(text string) bool {
+	for _, r := range text {
+		if unicode.Is(unicode.Han, r) {
+			return true
+		}
+	}
+	return false
+}