using TMPro;
using UnityEngine;
using Arena.Combat;

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

		#region Fields

		[SerializeField] private References _references;

		private ProjectileLauncher _launcher;

		#endregion

		#region Unity Lifecycle

		private void OnDestroy()
		{
			if (_launcher != null)
				_launcher.OnAmmoChange -= HandleAmmoChange;
		}

		#endregion

		#region Public Methods

		/// <summary>
		/// Starts displaying the ammo of a launcher. Called by the UiManager.
		/// </summary>
		public void Bind(ProjectileLauncher launcher)
		{
			_launcher = launcher;
			_launcher.OnAmmoChange += HandleAmmoChange;
			HandleAmmoChange(_launcher.State.Ammo, _launcher.MaxAmmo);
		}

		#endregion

		#region Private Methods

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

		#endregion
	}
}