using TMPro;
using UnityEngine;
using Arena.Combat;

namespace Arena.UI
{
	/// <summary>
	/// Displays a Health as "current / max".
	/// </summary>
	public class HealthView : MonoBehaviour
	{
		[System.Serializable]
		public struct References
		{
			public TMP_Text Label;
		}

		#region Fields

		[SerializeField] private References _references;

		private Health _health;

		#endregion

		#region Unity Lifecycle

		private void OnDestroy()
		{
			// Every subscription has its unsubscription
			if (_health != null)
				_health.OnChange -= HandleHealthChange;
		}

		#endregion

		#region Public Methods

		/// <summary>
		/// Starts displaying a Health. Called by the UiManager.
		/// </summary>
		public void Bind(Health health)
		{
			_health = health;
			_health.OnChange += HandleHealthChange;
			HandleHealthChange(_health.Current, _health.Max);
		}

		#endregion

		#region Private Methods

		private void HandleHealthChange(int current, int max)
		{
			_references.Label.SetText("{0} / {1}", current, max);
		}

		#endregion
	}
}