gather-and-defend/Assets/Scripts/StatusHandler.cs

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

public class StatusHandler : MonoBehaviour
{
    private Entity _entityLinked;
    private Dictionary<Enum.StatusType, Status> activeStatuses = new();

    public void ApplySlow(float intensity, float duration)
    {
        // check if effect already applied
        Slow slow = (Slow)GetStatus(Enum.StatusType.Slow);

        // init effect params
        slow.Intensity = intensity;

        // apply effect
        slow.Apply(duration);
    }

    // please add status to switch case everytime you design one!
    private Status GetStatus(Enum.StatusType type)
    {
        Status status;

        // check if status already exists
        activeStatuses.TryGetValue(type, out status);

        // if status doesn't exist, instantiate it
        if (!status)
        {
            switch (type)
            {
                case Enum.StatusType.Slow:
                    status = gameObject.AddComponent<Slow>();
                    break;
                default: break;
            }

            // if key value pair doesn't exist, create it
            // else update the existing one
            if (!activeStatuses.ContainsKey(type))
            {
                activeStatuses.Add(type, status);
            }
            else
            {
                activeStatuses[type] = status;
            }
        }

        // link entity to status
        status.EntityLinked = _entityLinked;

        return status;
    }

    private void Start()
    {
        _entityLinked = gameObject.GetComponent<Entity>();
    }
}