// <file>
//     <copyright see="prj:///doc/copyright.txt"/>
//     <license see="prj:///doc/license.txt"/>
//     <owner name="Daniel Grunwald"/>
//     <version>$Revision$</version>
// </file>

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;

using ICSharpCode.Core;
using ICSharpCode.SharpDevelop.Gui;

namespace ICSharpCode.SharpDevelop
{
	public static class StatusBarService
	{
		static SdStatusBar statusBar = null;
		
		internal static void Initialize()
		{
			statusBar = new SdStatusBar();
		}
		
		public static bool Visible {
			get {
				System.Diagnostics.Debug.Assert(statusBar != null);
				return statusBar.Visible;
			}
			set {
				System.Diagnostics.Debug.Assert(statusBar != null);
				statusBar.Visible = value;
			}
		}
		
		public static Control Control {
			get {
				System.Diagnostics.Debug.Assert(statusBar != null);
				return statusBar;
			}
		}
		
		public static void SetCaretPosition(int x, int y, int charOffset)
		{
			statusBar.CursorStatusBarPanel.Text = StringParser.Parse(
				"${res:StatusBarService.CursorStatusBarPanelText}",
				new string[,] {
					{"Line", String.Format("{0,-10}", y)},
					{"Column", String.Format("{0,-5}", x)},
					{"Character", String.Format("{0,-5}", charOffset)}
				});
		}
		
		public static void SetInsertMode(bool insertMode)
		{
			statusBar.ModeStatusBarPanel.Text = insertMode ? StringParser.Parse("${res:StatusBarService.CaretModes.Insert}") : StringParser.Parse("${res:StatusBarService.CaretModes.Overwrite}");
		}
		
		public static void ShowErrorMessage(string message)
		{
			System.Diagnostics.Debug.Assert(statusBar != null);
			statusBar.ShowErrorMessage(StringParser.Parse(message));
		}
		
		public static void SetMessage(string message)
		{
			System.Diagnostics.Debug.Assert(statusBar != null);
			lastMessage = message;
			statusBar.SetMessage(StringParser.Parse(message));
		}
		
		public static void SetMessage(Image image, string message)
		{
			System.Diagnostics.Debug.Assert(statusBar != null);
			statusBar.SetMessage(image, StringParser.Parse(message));
		}
		
		public static void SetMessage(string message, bool highlighted)
		{
			statusBar.SetMessage(message, highlighted);
		}
		
		static bool   wasError    = false;
		static string lastMessage = "";
		
		public static void RedrawStatusbar()
		{
			if (wasError) {
				ShowErrorMessage(lastMessage);
			} else {
				SetMessage(lastMessage);
			}
			
			Visible = PropertyService.Get("ICSharpCode.SharpDevelop.Gui.StatusBarVisible", true);
		}
		
		public static void Update()
		{
			System.Diagnostics.Debug.Assert(statusBar != null);
			/*		statusBar.Panels.Clear();
			statusBar.Controls.Clear();
			
			foreach (StatusBarContributionItem item in Items) {
				if (item.Control != null) {
					statusBar.Controls.Add(item.Control);
				} else if (item.Panel != null) {
					statusBar.Panels.Add(item.Panel);
				} else {
					throw new ApplicationException("StatusBarContributionItem " + item.ItemID + " has no Control or Panel defined.");
				}
			}*/
		}
		
		#region Progress Monitor
		static HashSet<StatusBarProgressMonitor> activeProgressMonitors = new HashSet<StatusBarProgressMonitor>();
		static StatusBarProgressMonitor currentProgressMonitor;
		
		public static IProgressMonitor CreateProgressMonitor()
		{
			System.Diagnostics.Debug.Assert(statusBar != null);
			return new StatusBarProgressMonitor();
		}
		
		sealed class StatusBarProgressMonitor : IProgressMonitor
		{
			int workDone, totalWork;
			
			public int WorkDone {
				get { return workDone; }
				set {
					if (workDone == value)
						return;
					workDone = value;
					lock (activeProgressMonitors) {
						if (currentProgressMonitor == this) {
							UpdateDisplay();
						}
					}
				}
			}
			
			void UpdateDisplay()
			{
				statusBar.DisplayProgress(taskName, workDone, totalWork);
			}
			
			string taskName;
			
			public string TaskName {
				get { return taskName; }
				set {
					if (taskName == value)
						return;
					taskName = value;
					lock (activeProgressMonitors) {
						if (currentProgressMonitor == this) {
							UpdateDisplay();
						}
					}
				}
			}
			
			public bool ShowingDialog { get; set; }
			
			public bool IsCancelled {
				get { return false; }
			}
			
			public void BeginTask(string name, int totalWork, bool allowCancel)
			{
				lock (activeProgressMonitors) {
					activeProgressMonitors.Add(this);
					currentProgressMonitor = this;
					this.taskName = name;
					this.workDone = 0;
					this.totalWork = totalWork;
					UpdateDisplay();
				}
			}
			
			public void Done()
			{
				lock (activeProgressMonitors) {
					activeProgressMonitors.Remove(this);
					if (currentProgressMonitor == this) {
						if (activeProgressMonitors.Count > 0) {
							currentProgressMonitor = activeProgressMonitors.First();
							currentProgressMonitor.UpdateDisplay();
						} else {
							currentProgressMonitor = null;
							statusBar.HideProgress();
						}
					}
				}
			}
			
			public event EventHandler Cancelled { add { } remove { } }
		}
		#endregion
	}
}