package main

import (
	"encoding/hex"
	"fmt"

	"google.golang.org/protobuf/proto"

	"powerpod/gotool/pb"
)

func runClients(sp *serialPort) error {
	payload, err := sp.exchange(byte(pb.MessageType_CLIENT_INFO), "CLIENT_INFO")
	if err != nil {
		return err
	}

	var msg pb.UartMessage
	if err := proto.Unmarshal(payload[1:], &msg); err != nil {
		return fmt.Errorf("decode protobuf: %w", err)
	}

	if msg.GetType() != pb.MessageType_CLIENT_INFO {
		return fmt.Errorf("unexpected message type %v", msg.GetType())
	}

	info := msg.GetClientInfoResponse()
	if info == nil {
		return fmt.Errorf("response missing client_info_response")
	}

	clients := info.GetClients()
	if len(clients) == 0 {
		fmt.Println("no clients registered")
		return nil
	}

	fmt.Printf("clients (%d):\n", len(clients))
	for i, c := range clients {
		mac := hex.EncodeToString(c.GetMac())
		fmt.Printf("  [%d] id=%d mac=%s ver=%d available=%v used=%v last_ping=%d last_success_ping=%d\n",
			i, c.GetId(), mac, c.GetVersion(), c.GetAvailable(), c.GetUsed(),
			c.GetLastPing(), c.GetLastSuccessPing())
	}
	return nil
}