#region Using Statements
using System;
using System.Collections.Generic;
using ANX.Framework.Graphics;

#endregion // Using Statements

#region License

//
// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
//
// This file is released under the Ms-PL license.
//
//
//
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the software, you accept this license. 
// If you do not accept the license, do not use the software.
//
// 1.Definitions
//   The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning 
//   here as under U.S. copyright law.
//   A "contribution" is the original software, or any additions or changes to the software.
//   A "contributor" is any person that distributes its contribution under this license.
//   "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2.Grant of Rights
//   (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations 
//       in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to 
//       reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
//       or any derivative works that you create.
//   (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in 
//       section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
//       patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution 
//       in the software or derivative works of the contribution in the software.
//
// 3.Conditions and Limitations
//   (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
//   (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your 
//       patent license from such contributor to the software ends automatically.
//   (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution 
//       notices that are present in the software.
//   (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
//       a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or 
//       object code form, you may only do so under a license that complies with this license.
//   (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
//       or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
//       extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a 
//       particular purpose and non-infringement.

#endregion // License

namespace ANX.Framework
{
    public class DrawableGameComponent : GameComponent, IDrawable
    {
        private bool isInitialized;
        private IGraphicsDeviceService device;

        public GraphicsDevice GraphicsDevice
        {
            get
            {
                if (this.device == null)
                {
                    throw new InvalidOperationException("Component is not initialized");
                }
                return this.device.GraphicsDevice;
            }
        }

        private int drawOrder;

        public int DrawOrder
        {
            get { return drawOrder; }
            set
            {
                if (drawOrder != value)
                {
                    drawOrder = value;
                    OnDrawOrderChanged(this, EventArgs.Empty);
                }
            }
        }

        private bool visible = true;

        public bool Visible
        {
            get { return visible; }
            set
            {
                if (visible != value)
                {
                    visible = value;
                    OnVisibleChanged(this, EventArgs.Empty);
                }
            }
        }
        
        public event EventHandler<EventArgs> DrawOrderChanged;

        public event EventHandler<EventArgs> VisibleChanged;

        public DrawableGameComponent(Game game)
            : base(game)
        {
        }

        protected virtual void OnDrawOrderChanged(object sender, EventArgs arg)
        {
            if (DrawOrderChanged != null)
            {
                DrawOrderChanged(sender, arg);
            }
        }

        protected virtual void OnVisibleChanged(object sender, EventArgs arg)
        {
            if (VisibleChanged != null)
            {
                VisibleChanged(sender, arg);
            }
        }

        public override void Initialize()
        {
            base.Initialize();
            if (!isInitialized)
            {
                this.device = base.Game.Services.GetService(typeof(IGraphicsDeviceService)) as IGraphicsDeviceService;
                if (this.device == null)
                {
                    throw new InvalidOperationException("Service not found: IGraphicsDeviceService");
                }
                this.device.DeviceCreated += OnDeviceCreated;
                this.device.DeviceDisposing += OnDeviceDisposing;
            }
            isInitialized = true;
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                this.UnloadContent();
                if (this.device != null)
                {
                    this.device.DeviceCreated -= OnDeviceCreated;
                    this.device.DeviceDisposing -= OnDeviceDisposing;
                }
            }
            base.Dispose(disposing);
        }

        protected virtual void LoadContent()
        {
        }

        protected virtual void UnloadContent()
        {
        }

        public void Draw(GameTime gameTime)
        {
            
        }

        private void OnDeviceCreated(object sender, EventArgs arg)
        {
            this.LoadContent();
        }

        private void OnDeviceDisposing(object sender, EventArgs arg)
        {
            this.UnloadContent();
        }
    }
}