FloatingHealthBar

using FishNet.Object;
using FishNet.Object.Synchronizing;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;

public class FloatingHealthBar : NetworkBehaviour
{
    private readonly SyncVar<float> healthValue = new SyncVar<float>();
    Observer<Stat> totalStatsHealthValue;

    private StatManager statManager;
    private Slider healthBar;

    public override void OnStartClient()
    {
        if (!base.IsOwner)
        {
            GetComponent<FloatingHealthBar>().enabled = false;
        }

        statManager = transform.root.GetComponent<StatManager>();
        healthBar = GetComponent<Slider>();

        StartCoroutine(ConfigureListener());

        healthValue.OnChange += HealthValue_OnChange;

        CalculateHealthPercentage();
    }

    public override void OnStopClient()
    {
        healthValue.OnChange -= HealthValue_OnChange;
    }

    private IEnumerator ConfigureListener()
    {
        while(statManager.CharacterTotalStats == null)
        {
            yield return null;
        }

        totalStatsHealthValue = statManager.CharacterTotalStats.statsDictionary[StatType.Primary][PrimaryStat.HP];
        totalStatsHealthValue.AddListener(CalculateHealthPercentage);
    }

    private void CalculateHealthPercentage()
    {
        float value = (float)statManager.CharacterTotalStats.statsDictionary[StatType.Primary][PrimaryStat.HP].Value.StatValue /
            (float)statManager.CharacterTotalStats.statsDictionary[StatType.Primary][PrimaryStat.MaxHP].Value.StatValue;

        SetHealthValueServer(value);
    }

    [ServerRpc]
    private void SetHealthValueServer(float healthPercentage)
    {
        healthValue.Value = healthPercentage;
    }

    private void HealthValue_OnChange(float prev, float next, bool asServer)
    {
        healthBar.value = healthValue.Value;
    }
}