/SOViewController.xib.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using System.Net;
using System.Text;

namespace iSOFlair
{
	/// <summary>
	/// Flair page 'template', re-used four times
	/// </summary>
	public partial class SOViewController : UIViewController
	{
		#region Constructors

		// The IntPtr and NSCoder constructors are required for controllers that need 
		// to be able to be created from a xib rather than from managed code

		public SOViewController (IntPtr handle) : base(handle)
		{
			Initialize ();
		}

		[Export("initWithCoder:")]
		public SOViewController (NSCoder coder) : base(coder)
		{
			Initialize ();
		}

		public SOViewController ()
		{
			Initialize ();
		}

		void Initialize ()
		{
			
		}

		#endregion

		private TrilogySite _site = null;

		public TrilogySite Site {
			get { return _site; }
			set {
				_site = value;
				
				imageLogo.Image = UIImage.FromFile (Site.Logo);
			}
		}
		/// <summary>
		/// Path to save image and cache
		/// </summary>
		public string DocumentsDirectory { get; set; }

		public string Username {
			get { return labelUsername.Text; }
			set { labelUsername.Text = value; }
		}
		public string Points {
			get { return labelPoints.Text; }
			set { labelPoints.Text = value; }
		}
		private string ImagePath {
			get { return Path.Combine (DocumentsDirectory, Site.PreferencesPrefix + "gravatar.png"); }
		}
		private string CachePath {
			get { return Path.Combine (DocumentsDirectory, Site.PreferencesPrefix + "cache.txt"); }
		}
		/// <summary>
		/// Setup the button delegates
		/// </summary>
		public void WireUp ()
		{
			buttonUpdate.TouchDown += delegate {
				buttonUpdate.Hidden = true;
				buttonSafari.Hidden = true;
				ScreenCapture ();
				buttonUpdate.Hidden = false;
				buttonSafari.Hidden = false;
			};
			buttonSafari.TouchDown += delegate { UIApplication.SharedApplication.OpenUrl (new NSUrl (String.Format (Site.ProfileUrl, Site.SiteId))); };
		}

		#region respond to shaking (OS3+)
		// also requires you to put
		// UIApplication.SharedApplication.ApplicationSupportsShakeToEdit = true;
		// in Main.cs : FinishedLaunching()
		public override bool CanBecomeFirstResponder {
			get { return true; }
		}
		public override void ViewDidAppear (bool animated)
		{
			base.ViewDidAppear (animated);
			this.BecomeFirstResponder ();
		}
		public override void ViewWillDisappear (bool animated)
		{
			this.ResignFirstResponder ();
			base.ViewWillDisappear (animated);
		}
		public override void MotionEnded (UIEventSubtype motion, UIEvent evt)
		{
			Console.WriteLine ("Motion detected");
			if (motion == UIEventSubtype.MotionShake) {
				Console.WriteLine ("and was a shake");
				labelLastUpdated.Text = "All shook up! Updating...";
				// never appears
				// Do your application-specific shake response here...
				Update ();
			}
		}
		#endregion
		/// <summary>
		/// Load data from txt file (cached from last webclient request)
		/// </summary>
		public bool LoadFromCache ()
		{
			bool loaded = false;
			Console.WriteLine ("Loading from cache.txt");
			try {
				string cache = "";
				if (File.Exists (CachePath)) {
					cache = System.IO.File.ReadAllText (CachePath);
				}
				if (cache == "") {
					labelConnectionError.Text = "Cache is empty. Shake to refresh data.";
					labelUsername.Text = "";
					labelPoints.Text = "";
					labelGoldBadges.Text = "";
					labelSilverBadges.Text = "";
					labelBronzeBadges.Text = "";
					textDebug.Text = "";
				} else {
					string[] cacheItems = cache.Split ('?');
					labelUsername.Text = cacheItems[0];
					labelPoints.Text = cacheItems[1];
					labelGoldBadges.Text = cacheItems[2] + " gold badges";
					labelSilverBadges.Text = cacheItems[3] + " silver badges";
					labelBronzeBadges.Text = cacheItems[4] + " bronze badges";
					//profileUrl = cacheItems[5];
					labelLastUpdated.Text = cacheItems[6] + " from cache";
					textDebug.Text = "";
					// blank out, nothing loaded from the web
					if (File.Exists (ImagePath)) {
						UIImage img = UIImage.FromFileUncached (ImagePath);
						// TODO: WHY didn't FromFile work, when FromFileUncached does?
						if (img != null)
							this.imageAvatar.Image = img;
					}
					loaded = true;
				}
			} catch (Exception ex) {
				labelConnectionError.Text = "Cache is invalid. Shake to refresh data.";
				labelUsername.Text = "";
				labelPoints.Text = "";
				labelGoldBadges.Text = "";
				labelSilverBadges.Text = "";
				labelBronzeBadges.Text = "";
				textDebug.Text = "";
			}
			return loaded;
		}

		/// <summary>
		/// Update this site data from the web, but downloading the flair, parsing 
		/// and saving in a cache text file
		/// </summary>
		public void Update ()
		{
			Console.WriteLine ("Loading from web " + Site.SiteId);
			labelLastUpdated.Text = "Loading...";
			
			// Download flair page
			WebClient wc = new WebClient ();
			Uri uri = new Uri (String.Format (Site.FlairUrl, Site.SiteId));
			byte[] bytes = null;
			try {
				UIApplication.SharedApplication.NetworkActivityIndicatorVisible = true;
				bytes = wc.DownloadData (uri);
			} catch (Exception ex) {
				Console.WriteLine ("Internet connection failed: " + ex.Message);
				textDebug.Text = Environment.NewLine + "DOWNLOADDATA:" + Environment.NewLine + ex.Message;
				labelLastUpdated.Text = "Internet connection failed: " + ex.Message;
				labelConnectionError.Text = "Update failed: cannot connect to the Internet.";
				return;
			} finally {
				UIApplication.SharedApplication.NetworkActivityIndicatorVisible = false;
			}
			// Parse flair HTML
			try {
				string result = Encoding.UTF8.GetString (bytes);
				
				int startpos = result.IndexOf ("<a");
				startpos = result.IndexOf ("href=", startpos) + 6;
				int endpos = result.IndexOf ("\"", startpos);
				string profileUrl = result.Substring (startpos, endpos - startpos);
				
				startpos = result.IndexOf ("img src", endpos) + 9;
				endpos = result.IndexOf ("\"", startpos);
				
				// download image
				string gravatarUrl = result.Substring (startpos, endpos - startpos);
				uri = new Uri (gravatarUrl);
				try {
					Console.WriteLine ("wc.Download(" + uri + "," + ImagePath + ")");
					wc.DownloadFile (uri, ImagePath);
				} catch (Exception ex1) {
					textDebug.Text += Environment.NewLine + "DOWNLOAD IMAGE:" + Environment.NewLine + gravatarUrl + Environment.NewLine + ImagePath + Environment.NewLine + ex1.Message;
				}
				
				// Parse the HTML
				//HACK: yes this is a hack... HtmlAgilityPack would've been smarter.
				startpos = result.IndexOf ("username", endpos);
				startpos = result.IndexOf ("_blank", endpos) + 8;
				endpos = result.IndexOf ("<", startpos);
				
				string username = result.Substring (startpos, endpos - startpos);
				
				labelUsername.Text = username;
				
				startpos = result.IndexOf ("reputation score", endpos) + 18;
				endpos = result.IndexOf ("<", startpos);
				
				string points = result.Substring (startpos, endpos - startpos);
				string goldBadges = "", silverBadges = "", bronzeBadges = "";
				startpos = result.IndexOf ("gold badge", endpos);
				if (startpos > 0) {
					startpos--;
					// remove preceding space
					endpos = result.IndexOf ("\"", startpos - 10) + 1;
					goldBadges = result.Substring (endpos, startpos - endpos);
					Console.WriteLine (" " + goldBadges);
					labelGoldBadges.Text = goldBadges + " gold badges";
				}
				startpos = result.IndexOf ("silver badge", endpos);
				if (startpos > 0) {
					startpos--;
					// remove preceding space
					endpos = result.IndexOf ("\"", startpos - 10) + 1;
					silverBadges = result.Substring (endpos, startpos - endpos);
					labelSilverBadges.Text = silverBadges + " silver badges";
				}
				startpos = result.IndexOf ("bronze badge", endpos);
				if (startpos > 0) {
					startpos--;
					// remove preceding space
					endpos = result.IndexOf ("\"", startpos - 10) + 1;
					bronzeBadges = result.Substring (endpos, startpos - endpos);
					labelBronzeBadges.Text = bronzeBadges + " bronze badges";
				}
				// load image from file into UIImage
				try {
					if (File.Exists (ImagePath)) {
						//UIImage img = UIImage.FromFile (ImagePath); // WHY does this break???
						UIImage img = UIImage.FromFileUncached (ImagePath);
						// BUT this works???
						if (img != null)
							this.imageAvatar.Image = img;
					} else {
						textDebug.Text += Environment.NewLine + "UIIMAGE NOT EXIST:" + Environment.NewLine + ImagePath;
					}
				} catch (Exception ex2) {
					textDebug.Text += Environment.NewLine + "FROM FILE: " + Environment.NewLine + ImagePath + Environment.NewLine + ex2.Message;
				}
				Console.WriteLine ("gold " + goldBadges);
				Console.WriteLine ("silver " + silverBadges);
				Console.WriteLine ("bronze " + bronzeBadges);
				
				
				labelPoints.Text = points;
				string dateUpdated = "Last updated " + DateTime.Now.ToString ("dd-MMM-yy hh:mm:ss");
				labelLastUpdated.Text = dateUpdated;
				
				string cache = String.Format ("{0}?{1}?{2}?{3}?{4}?{5}?{6}", username, points, goldBadges, silverBadges, bronzeBadges, profileUrl, dateUpdated);
				System.IO.File.WriteAllText (CachePath, cache);
				labelConnectionError.Text = "";
				// blank out if we get to here without Exception
			} catch (Exception ex) {
				labelLastUpdated.Text = ex.Message;
				textDebug.Text += Environment.NewLine + ex.Message;
			}
		}

		/// <summary>
		/// Capture a copy of the current View and:
		/// * re-display in a UIImage control
		/// * save to the Photos collection
		/// * save to disk in the application's Documents folder
		/// </summary>
		public void ScreenCapture ()
		{
			Console.WriteLine ("start image cap");
			Console.WriteLine ("frame" + this.View.Frame.Size);
			UIGraphics.BeginImageContext (View.Frame.Size);
			var documentsDirectory = Environment.GetFolderPath (Environment.SpecialFolder.Personal);
			
			var ctx = UIGraphics.GetCurrentContext ();
			if (ctx != null) {
				Console.WriteLine ("ctx not null");
				View.Layer.RenderInContext (ctx);
				Console.WriteLine ("render in context");
				UIImage img = UIGraphics.GetImageFromCurrentImageContext ();
				Console.WriteLine ("get from current content");
				UIGraphics.EndImageContext ();
				
				// Set to display in a UIImage control _on_ the view
				//imageLogo.Image = img;
				
				// Save to Photos
				img.SaveToPhotosAlbum ((sender, args) =>
				{
					Console.WriteLine ("image saved to Photos");
					var av = new UIAlertView ("Screenshot saved", "Image saved to " + Environment.NewLine + "Photos : Camera Roll", null, "Ok thanks", null);
					av.Show ();
				});
				
				// thought this "might" overwrite the splashscreen
				//string png = Path.Combine (documentsDirectory, "../iSOFlair.app/Default.png");
				
				// Save to application's Documents folder, kinda pointless except as an example
				// since there is no way to "read" it
				string png = Path.Combine (documentsDirectory, "Screenshot.png");
				NSData imgData = img.AsPNG ();
				NSError err = null;
				if (imgData.Save (png, false, out err)) {
					Console.WriteLine ("saved " + png);
				} else {
					Console.WriteLine ("not saved" + png + " because" + err.LocalizedDescription);
				}
			} else {
				Console.WriteLine ("ctx null - doesn't happen but wasn't sure at first");
			}
		}
	}
}