using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;

using GLib;
using Gdk;
using Gtk;

public class MainWindow: Gtk.Window
{
	protected Gtk.EventBox evtMain;
	protected Gtk.Image imgMain;
	
	private string config_file;
	private string base_directory;
	private string album_directory;
	private int timeout;
	
	private List<string> files;
	private Random random;
	private System.Threading.Thread timer;
	private object lock_box;

	/*~~~ Constructors ~~~*/
	public MainWindow (): base ("")
	{
		Stetic.Gui.Build (this, typeof(MainWindow));
		
		config_file = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
		config_file = System.IO.Path.Combine(config_file, ".stacks-frame");
		ReadConfig();
		files = new List<string>();
		random = new Random();
		
		// Set all of the backgrounds to black
		ModifyBg(Gtk.StateType.Normal, new Gdk.Color(0, 0, 0));
		imgMain.ModifyBg(Gtk.StateType.Normal, new Gdk.Color(0, 0, 0));
		evtMain.ModifyBg(Gtk.StateType.Normal, new Gdk.Color(0, 0, 0));
		
		// Hide the cursor
		Gdk.Pixmap blank_pixmap = Gdk.Pixmap.CreateFromData(null, "\0", 1, 1, 1, Gdk.Color.Zero, Gdk.Color.Zero);
		Gdk.Cursor blank_cursor = new Gdk.Cursor(blank_pixmap, blank_pixmap, Gdk.Color.Zero, Gdk.Color.Zero, 0, 0);
		GdkWindow.Cursor = blank_cursor;
		
		// Go full screen and start showing pictures
		// Fullscreen();
		// StartTimer();
		lock_box = new object();
		timer = new System.Threading.Thread(new ThreadStart(TimerTick));
		timer.Start();
	}
	
	/*~~~ Properties ~~~*/
	public string Album
	{
		get { return System.IO.Path.GetFileName(album_directory); }
		set
		{
			lock(lock_box)
			{
				album_directory = System.IO.Path.Combine(base_directory, value);
				files.Clear();
				WriteConfig();
			}
		}
	}
	
	public string AlbumDirectory
	{
		get { return album_directory; }
	}
	
	public string BaseDirectory
	{
		get { return base_directory; }
	}
	
	public int Timeout
	{
		get { return timeout; }
		set 
		{
			lock(lock_box)
			{
				timeout = value;
				WriteConfig();
			}
		}
	}
	
	/*~~~ Events ~~~*/
	protected void OnDeleteEvent (object sender, DeleteEventArgs a)
	{
		Application.Quit ();
		a.RetVal = true;
	}
	
	protected void OnKeyPressEvent(object o, Gtk.KeyPressEventArgs args)
	{
		Gdk.EventKey evt_key = args.Event;
		if (evt_key.Key == Gdk.Key.Escape)
		{
			Gtk.Application.Quit();
		}
	}
	
	/*~~~ Methods ~~~*/
	private void ReadConfig ()
	{
		if (File.Exists(config_file))
		{
			FileStream stream = new FileStream(config_file, FileMode.Open, FileAccess.Read);
			StreamReader reader = new StreamReader(stream);
			
			try
			{
				base_directory = reader.ReadLine();
				album_directory = reader.ReadLine();
				timeout = Int32.Parse(reader.ReadLine());
			}
			catch (Exception ex)
			{
				MessageDialog dialog = new MessageDialog(this, DialogFlags.DestroyWithParent, MessageType.Error, ButtonsType.Close, ex.Message);
				dialog.Run();
				Application.Quit();
			}
			
			reader.Close();
			stream.Close();
		}
		else
		{
			// Setup initial configurations
			base_directory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
			base_directory = System.IO.Path.Combine(base_directory, "Pictures");
			album_directory = System.IO.Path.Combine(base_directory, "Default");
			timeout = 60;
			
			// Create the initial album
			if (!Directory.Exists(System.IO.Path.Combine(base_directory, album_directory)))
			{
				Directory.CreateDirectory(album_directory);
			}
			
			// Save it
			WriteConfig();
		}
	}
	
	public void RestartTimer()
	{
	
	}
	
	private void ShowErrorImage()
	{
		Gtk.Application.Invoke(delegate { imgMain.SetFromStock(Gtk.Stock.MissingImage, Gtk.IconSize.Dialog); });
	}
	
	protected void TimerTick()
	{
		int i;
		string path;
		Pixbuf pixbuf;
		
		double screen_width;
		double screen_height;
		double image_width;
		double image_height;
		double width_ratio;
		double height_ratio;
		double scale_ratio;
		
		while (true)
		{
			Console.WriteLine("Locking...");
			lock(lock_box)
			{
				Console.WriteLine("Locked.");
				// Get new pictures or die trying
				if (files.Count == 0)
				{
					Console.WriteLine("Getting files...");
					files = new List<string>(Directory.GetFiles(album_directory));
				}
				
				if (files.Count == 0)
				{
					Console.WriteLine("No files to get.");
					// We still have no images, so error out
					ShowErrorImage();
				}
				else
				{	
					// Grab a random picture
					i = random.Next(files.Count);
					path = files[i];
					Console.WriteLine("Removing...");
					files.RemoveAt(i);
					Console.WriteLine("Removed");
					
					// Load the image
					try
					{
						Console.WriteLine("Reading Files...");
						pixbuf = new Pixbuf(path);
						Console.WriteLine("Read");
						
						screen_width = (double) this.GdkWindow.FrameExtents.Width;
						screen_height = (double) this.GdkWindow.FrameExtents.Height;
						
						image_width = (double) pixbuf.Width;
						image_height = (double) pixbuf.Height;
						
						width_ratio = screen_width / image_width;
						height_ratio = screen_height / image_height;
						
						scale_ratio = Math.Min(width_ratio, height_ratio);
						
						Console.WriteLine("Scaling image...");
						pixbuf = pixbuf.ScaleSimple((int)(image_width * scale_ratio), (int)(image_height * scale_ratio), Gdk.InterpType.Hyper);
						Console.WriteLine("Setting image...");
						Gtk.Application.Invoke(delegate { imgMain.Pixbuf = pixbuf; });
						Console.WriteLine("Done.");
					}
					catch (Exception)
					{
						Console.WriteLine("Exception");
						ShowErrorImage();
						
					}
				}
			}
			
			Console.WriteLine("Unlocked... Sleeping");
			System.Threading.Thread.Sleep(timeout * 1000);
			Console.WriteLine("Waking...");
		}
	}
	
	public void WriteConfig()
	{
		FileStream stream = new FileStream(config_file, FileMode.OpenOrCreate, FileAccess.Write);
		StreamWriter writer = new StreamWriter(stream);
		
		writer.WriteLine(base_directory);
		writer.WriteLine(album_directory);
		writer.WriteLine(timeout);
		
		writer.Close();
		stream.Close();
	}
}