racesm/Assets/Scripts/GameManager.cs

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class GameManager : MonoBehaviour
{
    public int lapAmount;
    public GameObject[] checkpoints;
    public GameObject[] players;
    [HideInInspector] public string[] playersFinished;

    int[] playerLaps;
    void Start()
    {
        // reset laps
        playerLaps = new int[players.Count()];

        for (int i = 0; i < playerLaps.Count(); i++)
        {
            playerLaps[i] = 1;
        }
    }

    // Update is called once per frame
    void Update()
    {
        for (int i = 0; i < players.Count(); i++)
        {
            GameObject player = players[i];

            if (playersFinished.Contains(player.name))
                continue;

            bool isAI = true;
            if (player.GetComponent<PlayerController>().enabled)
                isAI = false;

            if (isAI)
            {
                bool isFinished = player.GetComponent<AgentController>().isFinished;

                if (isFinished)
                {
                    player.GetComponent<AgentController>().isFinished = false;
                    playerLaps[i] += 1;
                }
            }
            else
            {
                int checkpointsCollected = player.GetComponent<PlayerController>().checkpointsCollected;

                if (checkpointsCollected == checkpoints.Count())
                {
                    player.GetComponent<PlayerController>().checkpointsCollected = 0;
                    playerLaps[i] += 1;
                }
            }

            if (playerLaps[i] > lapAmount)
            {
                player.GetComponent<Rigidbody>().isKinematic = true;
                playersFinished.Append(player.name);

                print("\nPlayers finished:");
                foreach (string pp in playersFinished)
                    print(pp);
            }
        }
    }
}