add ai feature

tests/integration/ai_preview_regen_test.go

@@ -0,0 +1,46 @@
+package integration
+
+import (
+	"bytes"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/rogeecn/renamer/cmd"
+)
+
+func TestAICommandSupportsPromptRefinement(t *testing.T) {
+	t.Setenv("RENAMER_AI_KEY", "test-key")
+
+	tmp := t.TempDir()
+	createFile(t, filepath.Join(tmp, "IMG_1024.jpg"))
+	createFile(t, filepath.Join(tmp, "notes/day1.txt"))
+
+	root := cmd.NewRootCommand()
+	root.SetArgs([]string{"ai", "--path", tmp})
+
+	// Simulate editing the prompt then quitting.
+	var output bytes.Buffer
+	input := strings.NewReader("e\nVacation Highlights\nq\n")
+	root.SetIn(input)
+	root.SetOut(&output)
+	root.SetErr(&output)
+
+	if err := root.Execute(); err != nil {
+		t.Fatalf("ai command returned error: %v\noutput: %s", err, output.String())
+	}
+
+	got := output.String()
+
+	if !strings.Contains(got, "Current prompt: \"Vacation Highlights\"") {
+		t.Fatalf("expected updated prompt in output, got: %s", got)
+	}
+
+	if !strings.Contains(got, "01.vacation-highlights-img-1024.jpg") {
+		t.Fatalf("expected regenerated suggestion with new prefix, got: %s", got)
+	}
+
+	if !strings.Contains(got, "Session ended without applying changes.") {
+		t.Fatalf("expected session completion message, got: %s", got)
+	}
+}