#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Globalization;
using System.Windows.Forms;
using CodeImp.DoomBuilder.Controls;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.Editing;
using System.Collections;
using System.IO;

#endregion

namespace CodeImp.DoomBuilder.Interface
{
	public partial class MainForm : Form
	{
		#region ================== Constants

		private const string STATUS_READY_TEXT = "Ready.";
		private const int MAX_RECENT_FILES = 8;
		private const int MAX_RECENT_FILES_PIXELS = 250;

		#endregion

		#region ================== Variables

		// Position/size
		private Point lastposition;
		private Size lastsize;
		private bool displayresized = true;
		
		// Mouse in display
		private bool mouseinside;
		
		// Input
		private bool shift, ctrl, alt;
		
		// Recent files
		private ToolStripMenuItem[] recentitems;
		
		#endregion

		#region ================== Properties

		public bool MouseInDisplay { get { return mouseinside; } }
		public Panel Display { get { return display; } }

		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		public MainForm()
		{
			// Setup controls
			InitializeComponent();

			// Fix things
			buttonzoom.Font = menufile.Font;

			// Bind any methods
			ActionAttribute.BindMethods(this);
			
			// Apply shortcut keys
			ApplyShortcutKeys();
			
			// Make recent items list
			CreateRecentFiles();
			
			// Keep last position and size
			lastposition = this.Location;
			lastsize = this.Size;
		}
		
		#endregion
		
		#region ================== General

		// This updates all menus for the current status
		public void UpdateInterface()
		{
			// Map opened?
			if(General.Map != null)
			{
				// Show map name and filename in caption
				this.Text = General.Map.FileTitle + " (" + General.Map.Options.CurrentName + ") - " + Application.ProductName;
			}
			else
			{
				// Show normal caption
				this.Text = Application.ProductName;
			}

			// Update menus and toolbar icons
			UpdateFileMenu();
			UpdateEditMenu();
			UpdateToolsMenu();
		}
		
		// Generic event that invokes the tagged action
		private void InvokeTaggedAction(object sender, EventArgs e)
		{
			General.Actions[(sender as ToolStripItem).Tag.ToString()].Invoke();
		}

		#endregion

		#region ================== Window

		// Window is loaded
		private void MainForm_Load(object sender, EventArgs e)
		{
			// Position window from configuration settings
			this.SuspendLayout();
			this.Location = new Point(General.Settings.ReadSetting("mainwindow.positionx", this.Location.X),
									  General.Settings.ReadSetting("mainwindow.positiony", this.Location.Y));
			this.Size = new Size(General.Settings.ReadSetting("mainwindow.sizewidth", this.Size.Width),
								 General.Settings.ReadSetting("mainwindow.sizeheight", this.Size.Height));
			this.WindowState = (FormWindowState)General.Settings.ReadSetting("mainwindow.windowstate", (int)FormWindowState.Maximized);
			this.ResumeLayout(true);
			
			// Normal windowstate?
			if(this.WindowState == FormWindowState.Normal)
			{
				// Keep last position and size
				lastposition = this.Location;
				lastsize = this.Size;
			}
		}
		
		// Window is moved
		private void MainForm_Move(object sender, EventArgs e)
		{
			// Normal windowstate?
			if(this.WindowState == FormWindowState.Normal)
			{
				// Keep last position and size
				lastposition = this.Location;
				lastsize = this.Size;
			}
		}

		// Window resizes
		private void MainForm_Resize(object sender, EventArgs e)
		{
			// Resizing
			//this.SuspendLayout();
			//resized = true;
		}

		// Window was resized
		private void MainForm_ResizeEnd(object sender, EventArgs e)
		{
			// Normal windowstate?
			if(this.WindowState == FormWindowState.Normal)
			{
				// Keep last position and size
				lastposition = this.Location;
				lastsize = this.Size;
			}
		}

		// Window is being closed
		private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
		{
			int windowstate;

			General.WriteLogLine("Closing main interface window...");

			// Unbind methods
			ActionAttribute.UnbindMethods(this);
			
			// Determine window state to save
			if(this.WindowState != FormWindowState.Minimized)
				windowstate = (int)this.WindowState;
			else
				windowstate = (int)FormWindowState.Normal;
			
			// Save window settings
			General.Settings.WriteSetting("mainwindow.positionx", lastposition.X);
			General.Settings.WriteSetting("mainwindow.positiony", lastposition.Y);
			General.Settings.WriteSetting("mainwindow.sizewidth", lastsize.Width);
			General.Settings.WriteSetting("mainwindow.sizeheight", lastsize.Height);
			General.Settings.WriteSetting("mainwindow.windowstate", windowstate);

			// Save recent files
			SaveRecentFiles();
			
			// Terminate the program
			General.Terminate(true);
		}

		#endregion

		#region ================== Statusbar

		// This returns the current status text
		public string GetCurrentSatus()
		{
			return statuslabel.Text;
		}
		
		// This changes status text
		public void DisplayStatus(string status)
		{
			// Update status description
			if(statuslabel.Text != status)
				statuslabel.Text = status;
			
			// Refresh if needed
			statusbar.Invalidate();
			this.Update();
		}

		// This changes status text to Ready
		public void DisplayReady()
		{
			// Display ready status description
			DisplayStatus(STATUS_READY_TEXT);
		}

		// This changes coordinates display
		public void UpdateCoordinates(Vector2D coords)
		{
			// X position
			if(float.IsNaN(coords.x))
				xposlabel.Text = "--";
			else
				xposlabel.Text = coords.x.ToString("####0");

			// Y position
			if(float.IsNaN(coords.y))
				yposlabel.Text = "--";
			else
				yposlabel.Text = coords.y.ToString("####0");
			
			// Update status bar
			statusbar.Update();
		}

		// This changes zoom display
		public void UpdateZoom(float scale)
		{
			// Update scale label
			if(float.IsNaN(scale))
				zoomlabel.Text = "--";
			else
			{
				scale *= 100;
				zoomlabel.Text = scale.ToString("##0") + "%";
			}

			// Update status bar
			statusbar.Update();
		}

		// Zoom to a specified level
		private void itemzoomto_Click(object sender, EventArgs e)
		{
			int zoom;

			if(General.Map == null) return;

			// In classic mode?
			if(General.Map.Mode is ViewClassicMode)
			{
				// Requested from menu?
				if(sender is ToolStripMenuItem)
				{
					// Get integral zoom level
					zoom = int.Parse((sender as ToolStripMenuItem).Tag.ToString(), CultureInfo.InvariantCulture);

					// Zoom now
					(General.Map.Mode as ViewClassicMode).SetZoom((float)zoom / 100f);
				}
			}
		}

		// Zoom to fit in screen
		private void itemzoomfittoscreen_Click(object sender, EventArgs e)
		{
			if(General.Map == null) return;
			
			// In classic mode?
			if(General.Map.Mode is ViewClassicMode)
				(General.Map.Mode as ViewClassicMode).CenterInScreen();
		}
		
		#endregion

		#region ================== Display

		// This shows the splash screen on display
		public void ShowSplashDisplay()
		{
			// Change display to show splash logo
			display.BackColor = System.Drawing.SystemColors.AppWorkspace;
			display.BackgroundImage = global::CodeImp.DoomBuilder.Properties.Resources.Splash2;
			display.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Center;
			this.Update();
		}
		
		// This clears the display
		public void ClearDisplay()
		{
			// Clear the display
			display.BackColor = Color.Black;
			display.BackgroundImage = null;
			display.BackgroundImageLayout = System.Windows.Forms.ImageLayout.None;
			this.Update();
		}

		// This redraws the display on the next paint event
		public void RedrawDisplay()
		{
			if((General.Map != null) && (General.Map.Mode != null)) General.Map.Mode.RedrawDisplay();
			display.Invalidate();
		}

		// Redraw requested
		private void redrawtimer_Tick(object sender, EventArgs e)
		{
			// Disable timer (only redraw once)
			redrawtimer.Enabled = false;

			// Resume control layouts
			//if(displayresized) General.LockWindowUpdate(IntPtr.Zero);

			// Map opened?
			if(General.Map != null)
			{
				// Display was resized?
				if(displayresized)
				{
					// Reset graphics to match changes
					General.Map.Graphics.Reset();
				}

				// Redraw now
				RedrawDisplay();
			}

			// Display resize is done
			displayresized = false;
		}

		// Display size changes
		private void display_Resize(object sender, EventArgs e)
		{
			// Resizing
			//if(!displayresized) General.LockWindowUpdate(display.Handle);
			displayresized = true;
			
			// Request redraw
			if(!redrawtimer.Enabled) redrawtimer.Enabled = true;
		}
		
		// Mouse click
		private void display_MouseClick(object sender, MouseEventArgs e) { if(General.Map != null) General.Map.Mode.MouseClick(e); }

		// Mouse doubleclick
		private void display_MouseDoubleClick(object sender, MouseEventArgs e) { if(General.Map != null) General.Map.Mode.MouseDoubleClick(e); }

		// Mouse down
		private void display_MouseDown(object sender, MouseEventArgs e) { if(General.Map != null) General.Map.Mode.MouseDown(e); }

		// Mouse enters
		private void display_MouseEnter(object sender, EventArgs e)
		{
			mouseinside = true;
			if(General.Map != null) General.Map.Mode.MouseEnter(e);
		}

		// Mouse leaves
		private void display_MouseLeave(object sender, EventArgs e)
		{
			mouseinside = false;
			if(General.Map != null) General.Map.Mode.MouseLeave(e);
		}

		// Mouse moves
		private void display_MouseMove(object sender, MouseEventArgs e) { if(General.Map != null) General.Map.Mode.MouseMove(e); }

		// Mouse up
		private void display_MouseUp(object sender, MouseEventArgs e) { if(General.Map != null) General.Map.Mode.MouseUp(e); }
		
		#endregion

		#region ================== Input

		// When the mouse wheel is changed
		protected override void OnMouseWheel(MouseEventArgs e)
		{
			int mod = 0;

			// Create modifiers
			if(alt) mod |= (int)Keys.Alt;
			if(shift) mod |= (int)Keys.Shift;
			if(ctrl) mod |= (int)Keys.Control;

			// Scrollwheel up?
			if(e.Delta > 0)
			{
				// Invoke actions for scrollwheel
				General.Actions.InvokeByKey(mod | (int)SpecialKeys.MScrollUp);
			}
			// Scrollwheel down?
			else if(e.Delta < 0)
			{
				// Invoke actions for scrollwheel
				General.Actions.InvokeByKey(mod | (int)SpecialKeys.MScrollDown);
			}
			
			// Let the base know
			base.OnMouseWheel(e);
		}
		
		// When a key is pressed
		private void MainForm_KeyDown(object sender, KeyEventArgs e)
		{
			// Keep key modifiers
			alt = e.Alt;
			shift = e.Shift;
			ctrl = e.Control;
			
			// Invoke any actions associated with this key
			General.Actions.InvokeByKey((int)e.KeyData);
		}

		// When a key is released
		private void MainForm_KeyUp(object sender, KeyEventArgs e)
		{
			// Keep key modifiers
			alt = e.Alt;
			shift = e.Shift;
			ctrl = e.Control;
		}

		#endregion

		#region ================== Menus

		// Public method to apply shortcut keys
		public void ApplyShortcutKeys()
		{
			// Apply shortcut keys to menus
			ApplyShortcutKeys(menumain.Items);
		}
		
		// This sets the shortcut keys on menu items
		private void ApplyShortcutKeys(ToolStripItemCollection items)
		{
			ToolStripMenuItem menuitem;
			string actionname;
			
			// Go for all controls to find menu items
			foreach(ToolStripItem item in items)
			{
				// This is a menu item?
				if(item is ToolStripMenuItem)
				{
					// Get the item in proper type
					menuitem = (item as ToolStripMenuItem);

					// Tag set for this item?
					if(menuitem.Tag != null)
					{
						// Get the action name
						actionname = menuitem.Tag.ToString();

						// Action with this name available?
						if(General.Actions.Exists(actionname))
						{
							// Put the action shortcut key on the menu item
							menuitem.ShortcutKeyDisplayString = Action.GetShortcutKeyDesc(General.Actions[actionname].ShortcutKey);
						}
					}

					// Recursively apply shortcut keys to child menu items as well
					ApplyShortcutKeys(menuitem.DropDownItems);
				}
			}
		}

		#endregion

		#region ================== File Menu

		// This sets up the file menu
		private void UpdateFileMenu()
		{
			// Enable/disable items
			itemclosemap.Enabled = (General.Map != null);
			itemsavemap.Enabled = (General.Map != null);
			itemsavemapas.Enabled = (General.Map != null);
			itemsavemapinto.Enabled = (General.Map != null);

			// Toolbar icons
			buttonnewmap.Enabled = itemnewmap.Enabled;
			buttonopenmap.Enabled = itemopenmap.Enabled;
			buttonsavemap.Enabled = itemsavemap.Enabled;
		}

		// This sets the recent files from configuration
		private void CreateRecentFiles()
		{
			int insertindex;
			bool anyitems = false;
			string filename;
			
			// Where to insert
			insertindex = menufile.DropDownItems.IndexOf(itemnorecent);
			
			// Create all items
			recentitems = new ToolStripMenuItem[MAX_RECENT_FILES];
			for(int i = 0; i < MAX_RECENT_FILES; i++)
			{
				// Create item
				recentitems[i] = new ToolStripMenuItem("");
				recentitems[i].Tag = "";
				recentitems[i].Click += new EventHandler(recentitem_Click);
				menufile.DropDownItems.Insert(insertindex + i, recentitems[i]);

				// Get configuration setting
				filename = General.Settings.ReadSetting("recentfiles.file" + i, "");
				if(filename != "")
				{
					// Set up item
					recentitems[i].Text = GetDisplayFilename(filename);
					recentitems[i].Tag = filename;
					recentitems[i].Visible = true;
					anyitems = true;
				}
				else
				{
					// Hide item
					recentitems[i].Visible = false;
				}
			}

			// Hide the no recent item when there are items
			itemnorecent.Visible = !anyitems;
		}
		
		// This saves the recent files list
		private void SaveRecentFiles()
		{
			// Go for all items
			for(int i = 0; i < MAX_RECENT_FILES; i++)
			{
				// Recent file set?
				if(recentitems[i].Text != "")
				{
					// Save to configuration
					General.Settings.WriteSetting("recentfiles.file" + i, recentitems[i].Tag.ToString());
				}
			}
		}
		
		// This adds a recent file to the list
		public void AddRecentFile(string filename)
		{
			int movedownto = MAX_RECENT_FILES - 1;
			
			// Check if this file is already in the list
			for(int i = 0; i < MAX_RECENT_FILES; i++)
			{
				// File same as this item?
				if(string.Compare(filename, recentitems[i].Tag.ToString(), true) == 0)
				{
					// Move down to here so that this item will disappear
					movedownto = i;
					break;
				}
			}
			
			// Go for all items, except the last one, backwards
			for(int i = movedownto - 1; i >= 0; i--)
			{
				// Move recent file down the list
				recentitems[i + 1].Text = recentitems[i].Text;
				recentitems[i + 1].Tag = recentitems[i].Tag.ToString();
				recentitems[i + 1].Visible = (recentitems[i + 1].Text != "");
			}

			// Add new file at the top
			recentitems[0].Text = GetDisplayFilename(filename);
			recentitems[0].Tag = filename;
			recentitems[0].Visible = true;
		}

		// This returns the trimmed file/path string
		private string GetDisplayFilename(string filename)
		{
			string newname;
			
			// String doesnt fit?
			if(GetStringWidth(filename) > MAX_RECENT_FILES_PIXELS)
			{
				// Start chopping off characters
				for(int i = filename.Length - 6; i >= 0; i--)
				{
					// Does it fit now?
					newname = filename.Substring(0, 3) + "..." + filename.Substring(filename.Length - i, i);
					if(GetStringWidth(newname) <= MAX_RECENT_FILES_PIXELS) return newname;
				}

				// Cant find anything that fits (most unlikely!)
				return "wtf?!";
			}
			else
			{
				// The whole string fits
				return filename;
			}
		}
		
		// This returns the width of a string
		private float GetStringWidth(string str)
		{
			Graphics g = Graphics.FromHwndInternal(this.Handle);
			SizeF strsize = g.MeasureString(str, this.Font);
			return strsize.Width;
		}
		
		// Exit clicked
		private void itemexit_Click(object sender, EventArgs e) { this.Close(); }

		// Recent item clicked
		private void recentitem_Click(object sender, EventArgs e)
		{
			// Get the item that was clicked
			ToolStripItem item = (sender as ToolStripItem);

			// Open this file
			General.OpenMapFile(item.Tag.ToString());
		}
		
		#endregion

		#region ================== Edit Menu

		// This sets up the edit menu
		private void UpdateEditMenu()
		{
			// No edit menu when no map open
			menuedit.Enabled = (General.Map != null);
			
			// Enable/disable items
			
			// Toolbar icons
			buttonmapoptions.Enabled = (General.Map != null);
		}
		
		#endregion

		#region ================== Help Menu

		// About clicked
		private void itemhelpabout_Click(object sender, EventArgs e)
		{
			AboutForm aboutform;
			
			// Show about dialog
			aboutform = new AboutForm();
			aboutform.ShowDialog(this);
		}

		#endregion

		#region ================== Tools Menu

		// This sets up the tools menu
		private void UpdateToolsMenu()
		{
			// Enable/disable items
			itemreloadresources.Enabled = (General.Map != null);
			
			// Toolbar icons
		}
		
		// Game Configuration action
		[Action(Action.CONFIGURATION)]
		public void ShowConfiguration()
		{
			// Show configuration dialog
			ConfigForm cfgform = new ConfigForm();
			if(cfgform.ShowDialog(this) == DialogResult.OK)
			{
				// Update interface
				UpdateInterface();
				
				// Reload resources if a map is open
				if(General.Map != null) General.Map.ReloadResources();
			}
			
			// Done
			cfgform.Dispose();
		}

		// Preferences action
		[Action(Action.PREFERENCES)]
		public void ShowPreferences()
		{
			// Show preferences dialog
			PreferencesForm prefform = new PreferencesForm();
			if(prefform.ShowDialog(this) == DialogResult.OK)
			{
				// Update shortcut keys in menus
				ApplyShortcutKeys();
			}

			// Done
			prefform.Dispose();
		}

		#endregion
	}
}