using System;
using UIKit;
using CoreGraphics;

namespace Shared
{
	/// <summary>
	/// 对话框
	/// </summary>
	public class Alert
	{
		/// <summary>
		/// 当前对话框
		/// </summary>
		UIAlertView myUIAlertView;

        /// <summary>
        /// 对话窗
        /// </summary>
        /// <param name="title">标题</param>
        /// <param name="message">信息</param>
        /// <param name="cancelButtonText">取消按键备注，值null表示不显示取消按键</param>
        /// <param name="okButtonText">确认按键备注</param>
        public Alert(string title, string message, string cancelButtonText, string okButtonText)
        {
            myUIAlertView = new UIAlertView { Title = title, Message = message };
            myUIAlertView.Clicked += (s, e) =>
            {
                if (ResultEventHandler != null)
                {
                    if (e.ButtonIndex == 0)
                    {
                        if (flag)
                        {
                            //取消按键
                            ResultEventHandler?.Invoke(this, false);
                        }
                        else
                        {
                            //按了确定
                            ResultEventHandler?.Invoke(this, true);
                        }
                    }
                    else if (e.ButtonIndex == 1)
                    {
                        //按了确定
                        ResultEventHandler?.Invoke(this, true);
                    }
                }

            };
            if (cancelButtonText != null)
            {
                myUIAlertView.AddButton(cancelButtonText);
                flag = true;
            }
            myUIAlertView.AddButton(okButtonText);
        }


        bool flag;
        /// <summary>
        /// 对话窗
        /// </summary>
        /// <param name="title">标题</param>
        /// <param name="message">信息</param>
        /// <param name="okButtonText">确认按键备注</param>
        public Alert(string title,string message,string okButtonText):this(title,message,null,okButtonText)
		{
			
		}

        /// <summary>
        /// 结果通知事件，true表示选中按键，false表示取消事件
        /// </summary>
        public Action<Alert, bool> ResultEventHandler;
	
		/// <summary>
		/// 显示当前的界面
		/// </summary>
		public void Show()
		{
            myUIAlertView.Show();

            //if (myUIAlertView != null && !myUIAlertView.Visible)
            //{
            //    myUIAlertView.Show();
            //}
        }



        /// <summary>
        /// 关闭当前的界面
        /// </summary>
        public void Dismiss()
        {
            if (myUIAlertView != null )
            {
                myUIAlertView.DismissWithClickedButtonIndex(0, false);
            }

        }

    }
}