1 files changed, 104 insertions, 0 deletions
diff --git a/internal/image/prompt.go b/internal/image/prompt.go
new file mode 100644
index 0000000..7e69a8c
--- /dev/null
+++ b/internal/image/prompt.go
@@ -0,0 +1,104 @@
+package image
+
+import "strings"
+
+const maxImagePromptChars = 1000
+
+func promptSubject(englishTranslation, fallback string) string {
+	subject := normalizePromptText(englishTranslation)
+	if subject != "" {
+		return subject
+	}
+
+	subject = normalizePromptText(fallback)
+	if subject != "" {
+		return subject
+	}
+
+	return "the requested term"
+}
+
+func normalizePromptText(text string) string {
+	text = trimMarkdownFence(text)
+	text = strings.TrimSpace(text)
+	text = strings.Trim(text, "`\"'")
+	text = strings.Join(strings.Fields(text), " ")
+	return strings.TrimSpace(text)
+}
+
+func sanitizeSceneDescription(scene string) string {
+	scene = normalizePromptText(scene)
+	lower := strings.ToLower(scene)
+
+	for _, prefix := range []string{"scene description:", "scene:", "description:", "image prompt:", "prompt:"} {
+		if strings.HasPrefix(lower, prefix) {
+			scene = strings.TrimSpace(scene[len(prefix):])
+			break
+		}
+	}
+
+	return strings.TrimSpace(strings.Trim(scene, "."))
+}
+
+func usableSceneDescription(scene string) bool {
+	scene = sanitizeSceneDescription(scene)
+	if scene == "" {
+		return false
+	}
+	if len(scene) < 24 {
+		return false
+	}
+	if len(strings.Fields(scene)) < 3 {
+		return false
+	}
+	return true
+}
+
+func trimMarkdownFence(text string) string {
+	text = strings.TrimSpace(text)
+	if !strings.HasPrefix(text, "```") {
+		return text
+	}
+
+	lines := strings.Split(text, "\n")
+	if len(lines) < 3 {
+		return text
+	}
+	if !strings.HasPrefix(strings.TrimSpace(lines[0]), "```") {
+		return text
+	}
+	if strings.TrimSpace(lines[len(lines)-1]) != "```" {
+		return text
+	}
+
+	return strings.Join(lines[1:len(lines)-1], "\n")
+}
+
+func withTerminalPunctuation(text string) string {
+	text = strings.TrimSpace(text)
+	if text == "" {
+		return ""
+	}
+
+	switch {
+	case strings.HasSuffix(text, "."):
+		return text
+	case strings.HasSuffix(text, "!"):
+		return text
+	case strings.HasSuffix(text, "?"):
+		return text
+	default:
+		return text + "."
+	}
+}
+
+func fallbackVisualDirection(subject string) string {
+	subject = normalizePromptText(subject)
+	lower := strings.ToLower(subject)
+
+	if strings.HasPrefix(lower, "to ") || len(strings.Fields(subject)) > 1 {
+		return "Show a realistic everyday scene with people, actions, facial expressions, and surrounding objects that make the meaning of \"" + subject + "\" obvious without any text."
+	}
+
+	return "Show a single " + subject + " as the clear focal point, prominently centered and immediately recognizable."
+}