using OTG.Lab06.Characters;
using UnityEngine;
using UnityEngine.UI;

namespace OTG.Lab06.UI
{
    public sealed class ResourceBarUI : MonoBehaviour
    {
        [SerializeField] private PlayerStats playerStats;
        [SerializeField] private Image fill;
        [SerializeField] private Text valueLabel;
        [SerializeField] private bool useMana;

        private void OnEnable()
        {
            Subscribe();
            Refresh();
        }

        private void OnDisable()
        {
            Unsubscribe();
        }

        public void Bind(PlayerStats stats, bool mana)
        {
            Unsubscribe();
            playerStats = stats;
            useMana = mana;
            Subscribe();
            Refresh();
        }

        private void Subscribe()
        {
            if (playerStats == null)
            {
                return;
            }

            if (useMana)
            {
                playerStats.ManaChanged += OnChanged;
            }
            else
            {
                playerStats.HealthChanged += OnChanged;
            }
        }

        private void Unsubscribe()
        {
            if (playerStats == null)
            {
                return;
            }

            playerStats.ManaChanged -= OnChanged;
            playerStats.HealthChanged -= OnChanged;
        }

        private void Refresh()
        {
            if (playerStats == null)
            {
                return;
            }

            OnChanged(useMana ? playerStats.Mana : playerStats.Health, useMana ? playerStats.MaxMana : playerStats.MaxHealth);
        }

        private void OnChanged(float current, float max)
        {
            float normalized = max <= 0f ? 0f : Mathf.Clamp01(current / max);
            if (fill != null)
            {
                fill.type = Image.Type.Filled;
                fill.fillMethod = Image.FillMethod.Horizontal;
                fill.fillOrigin = (int)Image.OriginHorizontal.Left;
                fill.fillAmount = normalized;
            }

            if (valueLabel != null)
            {
                valueLabel.text = $"{Mathf.RoundToInt(current)} / {Mathf.RoundToInt(max)}";
            }
        }
    }
}