How do I add scripts to gameobject if (x) but remove them if (not x)

Questions & Answers
1

I’m trying to make a game where you can click on a character to control them, so I want to add a PlayerController script to an object when clicked on. the stuff in this script is just adding and removing the PlayerController from the gameobject it’s attached to, but it doesn’t work. I’ve removed the faulty stuff and replaced it with comments describing what exactly I want to do, but I cannot figure out, no matter what method I use, how to make it work. (the stuff I need is in the update function)

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

public class Flufbol : MonoBehaviour
{
    float energy = 5f;
    public float food = 5f;
    public float metabolicRate = 0.1f;
    public float foodEfficiency = 2f;
    public float energyUsage = 0f;
    public float speed = 4f;
    public float jumpheight = 10f;
    public GameObject player;
    PlayerBase playerData;

    void Start()
    {
        playerData = player.GetComponent<PlayerBase>();
    }

    void Update()
    {
        //if playerdata.followedFlufbol = this gameobject:
            //add PlayerController script to this gameobject (but only 1)
        //else:
            //remove PlayerController script, if it exists, from this gameobject
    }

    void FixedUpdate()
    {
        if (food > 0)
        {
            energy += metabolicRate * Time.fixedDeltaTime * foodEfficiency;
            food -= metabolicRate * Time.fixedDeltaTime;
        }

        energy -= (metabolicRate * Time.fixedDeltaTime) + energyUsage;

        if (energy <= 0)
        {
            Destroy(gameObject);
        }
    }
}
2

To add a comonent, use gameObject.AddComponent<Component Type>();.
To delete it, use Destroy();.

In your case, you can do something like this :

        // Get the PlayerController attached to this gameObject
        PlayerController playerController = GetComponent<PlayerController>();

        if (playerdata.followedFlufbol == gameobject)
        {
            if (!playerController) // Check that there is no PlayerController
                gameObject.AddComponent(PlayerController);
        }
        else if (playerController) // Check that there is a PlayerController
        {
            Destroy(playerController);
        }