add ai feature

internal/ai/preview.go

@@ -0,0 +1,55 @@
+package ai
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/rogeecn/renamer/internal/ai/flow"
+	"github.com/rogeecn/renamer/internal/output"
+)
+
+// PrintPreview renders suggestions in a tabular format alongside validation results.
+func PrintPreview(w io.Writer, suggestions []flow.Suggestion, validation ValidationResult) error {
+	table := output.NewAIPlanTable()
+	if err := table.Begin(w); err != nil {
+		return err
+	}
+
+	for idx, suggestion := range suggestions {
+		if err := table.WriteRow(output.AIPlanRow{
+			Sequence:  fmt.Sprintf("%02d", idx+1),
+			Original:  suggestion.Original,
+			Proposed:  suggestion.Suggested,
+			Sanitized: flowToKey(suggestion.Suggested),
+		}); err != nil {
+			return err
+		}
+	}
+
+	if err := table.End(w); err != nil {
+		return err
+	}
+
+	for _, warn := range validation.Warnings {
+		if _, err := fmt.Fprintf(w, "Warning: %s\n", warn); err != nil {
+			return err
+		}
+	}
+
+	if len(validation.Conflicts) > 0 {
+		if _, err := fmt.Fprintln(w, "Conflicts detected:"); err != nil {
+			return err
+		}
+		for _, conflict := range validation.Conflicts {
+			if _, err := fmt.Fprintf(w, " - %s -> %s (%s)\n", conflict.Original, conflict.Suggested, conflict.Reason); err != nil {
+				return err
+			}
+		}
+	}
+
+	if _, err := fmt.Fprintf(w, "Previewed %d suggestion(s)\n", len(suggestions)); err != nil {
+		return err
+	}
+
+	return nil
+}