// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Xml.Linq;

using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.ILSpy.Bookmarks;
using ICSharpCode.ILSpy.Debugger;
using ICSharpCode.ILSpy.Debugger.Bookmarks;
using ICSharpCode.ILSpy.Debugger.Services;
using ICSharpCode.ILSpy.Debugger.UI;
using ICSharpCode.ILSpy.TreeNodes;
using ICSharpCode.TreeView;
using Microsoft.Win32;

namespace ICSharpCode.ILSpy.Debugger.Commands
{
	public abstract class DebuggerCommand : SimpleCommand
	{
		public DebuggerCommand()
		{
			MainWindow.Instance.KeyUp += OnKeyUp;
		}

		void OnKeyUp(object sender, KeyEventArgs e)
		{
			switch (e.Key) {
				case Key.F5:
					if (this is ContinueDebuggingCommand) {
						((ContinueDebuggingCommand)this).Execute(null);
						e.Handled = true;
					}
					break;
				case Key.System:
					if (this is StepOverCommand) {
						((StepOverCommand)this).Execute(null);
						e.Handled = true;
					}
					break;
				case Key.F11:
					if (this is StepIntoCommand) {
						((StepIntoCommand)this).Execute(null);
						e.Handled = true;
					}
					break;
				default:
					// do nothing
					break;
			}
		}
		
		#region Static members
		[System.Runtime.InteropServices.DllImport("user32.dll")]
		static extern bool SetWindowPos(
			IntPtr hWnd,
			IntPtr hWndInsertAfter,
			int X,
			int Y,
			int cx,
			int cy,
			uint uFlags);

		const UInt32 SWP_NOSIZE = 0x0001;
		const UInt32 SWP_NOMOVE = 0x0002;

		static readonly IntPtr HWND_BOTTOM = new IntPtr(1);
		static readonly IntPtr HWND_TOP = new IntPtr(0);

		static void SendWpfWindowPos(Window window, IntPtr place)
		{
			var hWnd = new WindowInteropHelper(window).Handle;
			SetWindowPos(hWnd, place, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
		}
		#endregion
		
		public override void Execute(object parameter)
		{
			DebugInformation.LoadedAssemblies = MainWindow.Instance.CurrentAssemblyList.GetAssemblies().Select(a => a.AssemblyDefinition);
		}
		
		protected static IDebugger CurrentDebugger {
			get {
				return DebuggerService.CurrentDebugger;
			}
		}
		
		protected void StartExecutable(string fileName, string workingDirectory, string arguments)
		{
			CurrentDebugger.Start(new ProcessStartInfo {
			                      	FileName = fileName,
			                      	WorkingDirectory = workingDirectory ?? Path.GetDirectoryName(fileName),
			                      	Arguments = arguments
			                      });
			Finish();
		}
		
		protected void StartAttaching(Process process)
		{
			CurrentDebugger.Attach(process);
			Finish();
		}
		
		protected void Finish()
		{
			EnableDebuggerUI(false);
			CurrentDebugger.DebugStopped += OnDebugStopped;
			CurrentDebugger.IsProcessRunningChanged += CurrentDebugger_IsProcessRunningChanged;
			DebugInformation.IsDebuggerLoaded = true;
			
			MainWindow.Instance.SetStatus("Running...", Brushes.Black);
		}
		
		protected void OnDebugStopped(object sender, EventArgs e)
		{
			EnableDebuggerUI(true);
			CurrentDebugger.DebugStopped -= OnDebugStopped;
			CurrentDebugger.IsProcessRunningChanged -= CurrentDebugger_IsProcessRunningChanged;
			DebugInformation.IsDebuggerLoaded = false;
			
			MainWindow.Instance.SetStatus("Stand by...", Brushes.Black);
		}
		
		protected void EnableDebuggerUI(bool enable)
		{
			var menuItems = MainWindow.Instance.GetMainMenuItems();
			var toolbarItems = MainWindow.Instance.GetToolBarItems();
			
			// menu
			var items = menuItems.OfType<MenuItem>().Where(m => (m.Header as string) == "_Debugger");
			foreach (var item in items.First().Items.OfType<MenuItem>()) {
				string header = (string)item.Header;
				
				if (header.StartsWith("Remove")) continue;
				
				if (header.StartsWith("Attach") || header.StartsWith("Debug"))
					item.IsEnabled = enable;
				else
					item.IsEnabled = !enable;
			}
			
			//toolbar
			var buttons = toolbarItems.OfType<Button>().Where(b => (b.Tag as string) == "Debugger");
			foreach (var item in buttons) {
				item.IsEnabled = enable;
			}
			
			// internal types
			MainWindow.Instance.SessionSettings.FilterSettings.ShowInternalApi = true;
		}
		
		void CurrentDebugger_IsProcessRunningChanged(object sender, EventArgs e)
		{
			if (CurrentDebugger.IsProcessRunning) {
				//SendWpfWindowPos(this, HWND_BOTTOM);
				MainWindow.Instance.SetStatus("Running...", Brushes.Black);
				return;
			}
			
			var inst = MainWindow.Instance;
			
			// breakpoint was hit => bring to front the main window
			SendWpfWindowPos(inst, HWND_TOP); inst.Activate();
			
			// jump to type & expand folding
			if (DebugInformation.DebugStepInformation != null)
				inst.JumpToReference(DebugInformation.DebugStepInformation.Item3);
			
			inst.SetStatus("Debugging...", Brushes.Red);
		}
	}
	
	[ExportContextMenuEntry(Header = "_Debug Assembly", Icon = "Images/application-x-executable.png")]
	internal sealed class DebugExecutableNodeCommand : DebuggerCommand, IContextMenuEntry
	{
		public bool IsVisible(SharpTreeNode[] selectedNodes)
		{
			return selectedNodes.All(n => n is AssemblyTreeNode && null != (n as AssemblyTreeNode).LoadedAssembly.AssemblyDefinition.EntryPoint);
		}
		
		public bool IsEnabled(SharpTreeNode[] selectedNodes)
		{
			return selectedNodes.Length == 1;
		}
		
		public void Execute(SharpTreeNode[] selectedNodes)
		{
			if (!CurrentDebugger.IsDebugging) {
				AssemblyTreeNode n = selectedNodes[0] as AssemblyTreeNode;
				
				var settings = ILSpySettings.Load();
				XElement e = settings["DebuggerSettings"];
				var askForArguments = (bool?)e.Attribute("askForArguments");
				if (askForArguments.HasValue && askForArguments.Value) {
					var window = new ExecuteProcessWindow { Owner = MainWindow.Instance, 
						SelectedExecutable = n.LoadedAssembly.FileName };
					if (window.ShowDialog() == true) {
						string fileName = window.SelectedExecutable;
						
						// execute the process
						this.StartExecutable(fileName, window.WorkingDirectory, window.Arguments);
					}
				} else {
					this.StartExecutable(n.LoadedAssembly.FileName, null, null);
				}
			}
		}
	}
	
	[ExportToolbarCommand(ToolTip = "Debug an executable",
	                      ToolbarIcon = "Images/application-x-executable.png",
	                      ToolbarCategory = "Debugger",
	                      Tag = "Debugger",
	                      ToolbarOrder = 0)]
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuIcon = "Images/application-x-executable.png",
	                       MenuCategory = "Start",
	                       Header = "Debug an _executable",
	                       MenuOrder = 0)]
	internal sealed class DebugExecutableCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (!CurrentDebugger.IsDebugging) {
				var settings = ILSpySettings.Load();
				XElement e = settings["DebuggerSettings"];
				var askForArguments = (bool?)e.Attribute("askForArguments");
				if (askForArguments.HasValue && askForArguments.Value) {
					var window = new ExecuteProcessWindow { Owner = MainWindow.Instance };
					if (window.ShowDialog() == true) {
						string fileName = window.SelectedExecutable;
						
						// add it to references
						MainWindow.Instance.OpenFiles(new [] { fileName }, false);
						
						// execute the process
						this.StartExecutable(fileName, window.WorkingDirectory, window.Arguments);
					}
				} else {
					OpenFileDialog dialog = new OpenFileDialog() {
						Filter = ".NET Executable (*.exe) | *.exe",
						RestoreDirectory = true,
						DefaultExt = "exe"
					};
					if (dialog.ShowDialog() == true) {
						string fileName = dialog.FileName;
						
						// add it to references
						MainWindow.Instance.OpenFiles(new [] { fileName }, false);
						
						// execute the process
						this.StartExecutable(fileName, null, null);
					}
				}
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuCategory = "Start",
	                       Header = "Attach to _running application",
	                       MenuOrder = 1)]
	internal sealed class AttachCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (!CurrentDebugger.IsDebugging) {
				
				var settings = ILSpySettings.Load();
				XElement e = settings["DebuggerSettings"];
				var showWarnings = (bool?)e.Attribute("showWarnings");
				if ((showWarnings.HasValue && showWarnings.Value) || !showWarnings.HasValue)
					MessageBox.Show("Warning: When attaching to an application, some local variables might not be available. If possible, use the \"Start Executable\" command.",
				                "Attach to a process", MessageBoxButton.OK, MessageBoxImage.Warning);
				
				var window = new AttachToProcessWindow { Owner = MainWindow.Instance };
				if (window.ShowDialog() == true) {
					StartAttaching(window.SelectedProcess);
				}
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuIcon = "Images/ContinueDebugging.png",
	                       MenuCategory = "SteppingArea",
	                       Header = "Continue debugging",
	                       InputGestureText = "F5",
	                       IsEnabled = false,
	                       MenuOrder = 2)]
	internal sealed class ContinueDebuggingCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (CurrentDebugger.IsDebugging && !CurrentDebugger.IsProcessRunning) {
				CurrentDebugger.Continue();
				MainWindow.Instance.SetStatus("Running...", Brushes.Black);
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuIcon = "Images/StepInto.png",
	                       MenuCategory = "SteppingArea",
	                       Header = "Step into",
	                       InputGestureText = "F11",
	                       IsEnabled = false,
	                       MenuOrder = 3)]
	internal sealed class StepIntoCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (CurrentDebugger.IsDebugging && !CurrentDebugger.IsProcessRunning) {
				base.Execute(null);
				CurrentDebugger.StepInto();
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuIcon = "Images/StepOver.png",
	                       MenuCategory = "SteppingArea",
	                       Header = "Step over",
	                       InputGestureText = "F10",
	                       IsEnabled = false,
	                       MenuOrder = 4)]
	internal sealed class StepOverCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (CurrentDebugger.IsDebugging && !CurrentDebugger.IsProcessRunning) {
				base.Execute(null);
				CurrentDebugger.StepOver();
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuIcon = "Images/StepOut.png",
	                       MenuCategory = "SteppingArea",
	                       Header = "Step out",
	                       IsEnabled = false,
	                       MenuOrder = 5)]
	internal sealed class StepOutCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (CurrentDebugger.IsDebugging && !CurrentDebugger.IsProcessRunning) {
				base.Execute(null);
				CurrentDebugger.StepOut();
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuCategory = "SteppingArea",
	                       Header = "_Detach from running application",
	                       IsEnabled = false,
	                       MenuOrder = 6)]
	internal sealed class DetachCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			if (CurrentDebugger.IsDebugging){
				CurrentDebugger.Detach();
				
				EnableDebuggerUI(true);
				CurrentDebugger.DebugStopped -= OnDebugStopped;
			}
		}
	}
	
	[ExportMainMenuCommand(Menu = "_Debugger",
	                       MenuIcon = "Images/DeleteAllBreakpoints.png",
	                       MenuCategory = "Others",
	                       Header = "Remove all _breakpoints",
	                       MenuOrder = 7)]
	internal sealed class RemoveBreakpointsCommand : DebuggerCommand
	{
		public override void Execute(object parameter)
		{
			for (int i = BookmarkManager.Bookmarks.Count - 1; i >= 0; --i) {
				var bookmark = BookmarkManager.Bookmarks[i];
				if (bookmark is BreakpointBookmark) {
					BookmarkManager.RemoveMark(bookmark);
				}
			}
		}
	}
}