// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using System.Drawing;
using OpenTK.Input;

namespace ClassicalSharp.Gui {
	
	public abstract class KeyBindingsScreen : MenuScreen {
		
		public KeyBindingsScreen( Game game ) : base( game ) { }
		
		public override void Render( double delta ) {
			RenderMenuBounds();
			api.Texturing = true;
			RenderMenuWidgets( delta );
			statusWidget.Render( delta );
			api.Texturing = false;
		}
		
		Font keyFont;
		TextWidget statusWidget;
		static string[] keyNames;
		protected string[] descriptions;
		protected KeyBinding originKey;
		protected int btnDistance = 45, btnWidth = 260, btnHeight = 35;
		
		public override void Init() {
			base.Init();
			if( keyNames == null )
				keyNames = Enum.GetNames( typeof( Key ) );
			keyFont = new Font( game.FontName, 16, FontStyle.Bold );
			regularFont = new Font( game.FontName, 16, FontStyle.Italic );
			statusWidget = ChatTextWidget.Create( game, 0, 130, "", 
			                                     Anchor.Centre, Anchor.Centre, regularFont );
		}
		
		protected int index;
		protected void MakeKeys( KeyBinding start, int descStart, int len, int x, int y ) {
			for( int i = 0; i < len; i++ ) {
				KeyBinding binding = (KeyBinding)((int)start + i);
				string text = descriptions[descStart + i] + ": "
					+ keyNames[(int)game.Mapping( binding )];
				
				widgets[index++] = ButtonWidget.Create( game, x, y, btnWidth, btnHeight, text,
				                                       Anchor.Centre, Anchor.Centre, keyFont, OnBindingClick );
				y += btnDistance;
			}
		}
		
		ButtonWidget curWidget;
		void OnBindingClick( Game game, Widget widget, MouseButton mouseBtn ) {
			if( mouseBtn == MouseButton.Right && (curWidget == null || curWidget == widget) ) {
				curWidget = (ButtonWidget)widget;
				int index = Array.IndexOf<Widget>( widgets, curWidget );
				KeyBinding mapping = (KeyBinding)(index + (int)originKey);
				HandlesKeyDown( game.InputHandler.Keys.GetDefault( mapping ) );
			}
			if( mouseBtn != MouseButton.Left ) return;
			
			if( curWidget == widget ) {
				curWidget = null;
				statusWidget.SetText( "" );
			} else {
				curWidget = (ButtonWidget)widget;
				int index = Array.IndexOf<Widget>( widgets, curWidget );
				string text = "&ePress new key binding for " + descriptions[index] + ":";
				statusWidget.SetText( text );
			}
		}
		
		public override bool HandlesKeyDown( Key key ) {
			if( key == Key.Escape ) {
				game.SetNewScreen( null );
			} else if( curWidget != null ) {
				int index = Array.IndexOf<Widget>( widgets, curWidget );
				KeyBinding mapping = (KeyBinding)(index + (int)originKey);
				KeyMap map = game.InputHandler.Keys;
				Key oldKey = map[mapping];
				string reason;
				
				if( !map.IsKeyOkay( oldKey, key, out reason ) ) {
					const string format = "&eFailed to change mapping \"{0}\". &c({1})";
					statusWidget.SetText( String.Format( format, descriptions[index], reason ) );
				} else {
					const string format = "&eChanged mapping \"{0}\" from &7{1} &eto &7{2}&e.";
					statusWidget.SetText( String.Format( format, descriptions[index], oldKey, key ) );
					string text = descriptions[index] + ": " + keyNames[(int)key];
					
					curWidget.SetText( text );
					map[mapping] = key;
				}
				curWidget = null;
			}
			return key < Key.F1 || key > Key.F35;
		}
		
		public override void Dispose() {
			keyFont.Dispose();
			base.Dispose();
			statusWidget.Dispose();
		}
	}
}