1 files changed, 72 insertions, 0 deletions
diff --git a/internal/comic/text_validation.go b/internal/comic/text_validation.go
new file mode 100644
index 0000000..31f1bba
--- /dev/null
+++ b/internal/comic/text_validation.go
@@ -0,0 +1,72 @@
+package comic
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+)
+
+var promptLeakMarkers = []string{
+	"words to include",
+	"required words",
+	"character guide",
+	"comic title",
+	"panel script",
+	"mandatory language rule",
+	"mandatory panel layout",
+	"mandatory speech bubbles",
+	"strict consistency rules",
+	"story excerpt",
+	"story teaser",
+	"story ending hint",
+	"---character guide---",
+	"---comic title---",
+	"---panel script---",
+}
+
+func validateTextScript(label, text, script string) error {
+	text = strings.TrimSpace(text)
+	if text == "" {
+		return fmt.Errorf("%s is empty", label)
+	}
+
+	switch {
+	case strings.EqualFold(script, "Cyrillic"):
+		if containsLatinLetters(text) {
+			return fmt.Errorf("%s contains Latin letters despite %s script", label, script)
+		}
+	case strings.EqualFold(script, "Latin"):
+		if containsCyrillicLetters(text) {
+			return fmt.Errorf("%s contains Cyrillic letters despite %s script", label, script)
+		}
+	}
+	return nil
+}
+
+func containsLatinLetters(text string) bool {
+	for _, r := range text {
+		if unicode.Is(unicode.Latin, r) {
+			return true
+		}
+	}
+	return false
+}
+
+func containsCyrillicLetters(text string) bool {
+	for _, r := range text {
+		if unicode.Is(unicode.Cyrillic, r) {
+			return true
+		}
+	}
+	return false
+}
+
+func validateNoPromptLeakage(label, text string) error {
+	lower := strings.ToLower(text)
+	for _, marker := range promptLeakMarkers {
+		if strings.Contains(lower, marker) {
+			return fmt.Errorf("%s contains prompt leakage marker %q", label, marker)
+		}
+	}
+	return nil
+}