/*
 * EntityProgressBar.cs
 * Authors: Mike DeMauro
 * Copyright (c) 2007-2008 Cornell University

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 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.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

using System;
using System.Collections.Generic;
using System.Text;
using tAC_Engine.Graphics.Entities;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace StellarProspector
{
    /// <summary>
    /// Keeps track of progress in Integer form in a range from 0 to MaxProgress.
    /// Graphically, this progress bar is intended for a 180 degree arc, rotating as progress increases.
    /// </summary>
    internal class EntityProgressBar : EntitySprite
    {
        #region Fields

        /// <summary>
        /// The viewport that is used in the rendering of this object
        /// </summary>
        protected Viewport myViewport;

        /// <summary>
        /// A reference to the old viewport so that it can be restored after drawing
        /// </summary>
        protected Viewport gameViewport;

        /// <summary>
        /// The current value of progress.
        /// </summary>
        protected int mProgress;

        /// <summary>
        /// The maximum progress cap.
        /// </summary>
        protected int mMaxProgress;

        #endregion

        #region Properties

        /// <summary>
        /// Gets/Sets the current value of progress.
        /// </summary>
        public int Progress
        {
            get { return mProgress; }
            set
            {
                if (value < 0)
                {
                    mProgress = 0;
                }
                else if (value > mMaxProgress)
                {
                    mProgress = mMaxProgress;
                }
                else
                {
                    mProgress = value;
                }
            }
            
        }

        /// <summary>
        /// Gets/Sets the maximum progress cap.
        /// </summary>
        public int MaxProgress
        {
            get { return mMaxProgress; }
            set { mMaxProgress = value; }
        }

        /// <summary>
        /// Gets/Sets the position of the sprite on the screen. Defaults to Vecter2.Zero
        /// </summary>
        public new Vector2 Position
        {
            get { return new Vector2(m_Destination.X, m_Destination.Y); }
            set
            {
                myViewport.X = (int)value.X - (int)m_RotationOrigin.X;
                myViewport.Y = (int)value.Y - (int)m_RotationOrigin.Y;
            }
        }

        /// <summary>
        /// Gets/Sets the origin of rotation of the sprite. Default is Upper left (Vector.Zero).
        /// </summary>
        public new Vector2 RotationOrigin
        {
            get {  return m_RotationOrigin; }
            set
            {
                m_RotationOrigin = value;
                m_Destination.X = (int)value.X;
                m_Destination.Y = (int)value.Y;                
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Creates a new EntityProgressBar
        /// </summary>
        /// <param name="content">The content manager to load in associated content</param>
        /// <param name="textureName">Name of the texture to represent the progress bar</param>
        public EntityProgressBar(ContentManager content, string textureName)
            : base(content, textureName) { }

        /// <summary>
        /// Loads in content dependent values
        /// </summary>
        protected override void LoadContent()
        {
            base.LoadContent();
            myViewport = new Viewport();
            myViewport.Width = Width;
            myViewport.Height = Height;
            myViewport.MinDepth = GraphicsDevice.Viewport.MinDepth;
            myViewport.MaxDepth = GraphicsDevice.Viewport.MaxDepth;
            gameViewport = GraphicsDevice.Viewport;
        }

        /// <summary>
        /// Updates progress bar
        /// </summary>
        /// <param name="gameTime">The time that has passed in-game</param>
        public override void Update(Microsoft.Xna.Framework.GameTime gameTime)
        {
            m_Rotation = (1f - ((float)mProgress / mMaxProgress)) * MathHelper.Pi;
            base.Update(gameTime);
        }

        /// <summary>
        /// Renders the progress bar
        /// </summary>
        /// <param name="gameTime">The time that has passed in-game</param>
        public override void Draw(Microsoft.Xna.Framework.GameTime gameTime)
        {
            GraphicsDevice.Viewport = myViewport;
            base.Draw(gameTime);
            GraphicsDevice.Viewport = gameViewport;
        }

        #endregion
    }
}