using System;
using System.Net;
using CoreGraphics;
using UIKit;

namespace Shared
{
	public class UrlMonitor : View
	{
		public UrlMonitor()
		{
			uiView = new UIImageView { Tag=int.MinValue};
		}

        public 

		//是否已经启动
		bool isStarted;
		/// <summary>
		/// 用户名
		/// </summary>
		public string UserName = "";
		/// <summary>
		/// 密码
		/// </summary>
		public string Password = "";

		/// <summary>
		/// 摄像头的图片地址
		/// </summary>
		public string URL;

		/// <summary>
		/// 启动
		/// </summary>
		public void Start()
		{
			if (isStarted)
			{
				return;
			}
			isStarted = true;
			System.Threading.Tasks.Task.Run(() =>
				{
					while (isStarted)
					{
						System.Threading.Thread.Sleep(100);
						try
						{
							WebClient webClient = new WebClient();
							webClient.Headers.Add("Accept-Encoding", "gzip, deflate");
							webClient.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes(UserName + ":" + Password)));
							var bytes = webClient.DownloadData(URL);
							var uiImage = UIImage.LoadFromData(Foundation.NSData.FromArray(bytes));
							Application.RunOnMainThread(() =>
							{
								try
								{
									(uiView as UIImageView).Image = imimage(uiImage);
								}
								catch { }
							});
						}
						catch { }
					}
				});
		}
		/// <summary>
		/// 停止播放
		/// </summary>
		public void Stop()
		{
			isStarted = false;
		}

        /// <summary>
        /// 旋转当前画面
        /// </summary>
        /// <returns>源图</returns>
        /// <param name="image">旋转后的界面</param>
        UIImage imimage(UIImage image)
        {
            if (Application.IsPad)
            {
                return image;
            }
            else
            {
                var rotate = 3 * Math.PI / 2;
                var rect = new CGRect(0, 0, image.Size.Height, image.Size.Width);
                nfloat translateX = -rect.Size.Height;
                nfloat translateY = 0;
                nfloat scaleX = rect.Size.Height / rect.Size.Width;
                nfloat scaleY = rect.Size.Width / rect.Size.Height;
                //case UIImageOrientation.Right:
                //rotate = 3 * Math.PI / 2;
                //	rect = new CGRect(0, 0, image.Size.Height, image.Size.Width);
                //	translateX = -rect.Size.Height;
                //	translateY = 0;
                //	scaleY = rect.Size.Width / rect.Size.Height;
                //	scaleX = rect.Size.Height / rect.Size.Width;
                //	break;
                //case UIImageOrientation.Down:
                //	rotate = M_PI;
                //	rect = new CGRect(0, 0, image.Size.Width, image.Size.Height);
                //	translateX = -rect.Size.Width;
                //	translateY = -rect.Size.Height;
                //	break;
                //default:
                //	rotate = 0.0f;
                //	rect = new CGRect(0, 0, image.Size.Width, image.Size.Height);
                //	translateX = 0;
                //	translateY = 0;
                //	break;

                UIGraphics.BeginImageContext(rect.Size);
                var context = UIGraphics.GetCurrentContext();
                //做CTM变换
                context.TranslateCTM(0.0f, rect.Size.Height);
                context.ScaleCTM(1.0f, -1.0f);
                context.RotateCTM((nfloat)rotate);
                context.TranslateCTM(translateX, translateY);
                context.ScaleCTM(scaleX, scaleY);

                //绘制图片
                context.DrawImage(new CGRect(0, 0, rect.Size.Width, rect.Size.Height), image.CGImage);
                return UIGraphics.GetImageFromCurrentImageContext();
            }
        }
	}
}