using Core.Economy;
using System.Xml;
using TMPro;
using TowerDefense.Level;
using UnityEngine;
using UnityEngine.UI;

namespace TowerDefense.UI.HUD
{
	/// <summary>
	/// A class for controlling the displaying the currency
	/// </summary>
	public class CurrencyUI : MonoBehaviour
	{
		/// <summary>
		/// TextMeshPro对应的金币数据
		/// </summary>
		public TextMeshProUGUI displayText;

		// 对手的金币显示
		//public Text displayOpp;

		/// <summary>
		/// The currency prefix to display next to the amount
		/// </summary>
		public string currencySymbol = "$";

		protected Currency m_Currency;
		protected Currency m_CurrencyOpp;

		/// <summary>
		/// Assign the correct currency value
		/// </summary>
		protected virtual void Start()
		{
		}

        protected void Update()
        {
			if (m_Currency != null) return ;

			if ( (LevelManager.instance != null) )
			{
				m_Currency = LevelManager.instance.currency;
				//m_CurrencyOpp = OpponentMgr.instance.currency;

				UpdateDisplay();
				m_Currency.currencyChanged += UpdateDisplay;
				//m_CurrencyOpp.currencyChanged += UpdateDisplay;
			}
			else
			{
				Debug.LogError("[UI] No level manager to get currency from");
			}

		}

		/// <summary>
		/// Unsubscribe from events
		/// </summary>
		protected virtual void OnDestroy()
		{
			if (m_Currency != null)
			{
				m_Currency.currencyChanged -= UpdateDisplay;
				if( m_CurrencyOpp != null  )
					m_CurrencyOpp.currencyChanged -= UpdateDisplay;
			}
		}

		/// <summary>
		/// A method for updating the display based on the current currency
		/// </summary>
		protected void UpdateDisplay()
		{
			int current = m_Currency.currentCurrency;
			displayText.text = AddNumberSemi(current.ToString());

			//m_CurrencyOpp = OpponentMgr.instance.currency;
			//current = m_CurrencyOpp.currentCurrency;
			//displayOpp.text = current.ToString();
		}

		/// <summary>
		/// 在数字中加入分号.
		/// </summary>
		/// <param name="str"></param>
		protected string AddNumberSemi( string str)
        {
			int len = str.Length;
			for( int ipos = len-3;ipos>0;ipos -= 3 )
            {
				str = str.Insert(ipos, ",");
            }
			return str;
        }
	}
}