add basic chat loop

main.go

@@ -106,8 +106,9 @@ func singlePromptInteraction(systemPrompt, prompt string, retries int) (openai.C
 	if err != nil {
 		// if 429, wait and try again
 		if strings.Contains(err.Error(), "429") && retries > 0 {
-			fmt.Println("429 error, waiting 5 seconds...")
-			time.Sleep(5 * time.Second)
+			seconds := (1 / retries) * 60 // back off for each retry e.g. 12, 15, 20, 30, 60
+			fmt.Printf("429 error, waiting %v seconds...\n", seconds)
+			time.Sleep(time.Duration(seconds) * time.Second)
 			return singlePromptInteraction(systemPrompt, prompt, retries-1) // TODO: establish base case to prevent forever retrying
 		}
 		return openai.ChatCompletionResponse{}, fmt.Errorf("ChatCompletion request error: %w", err)