//--------------------------------------------------------------------------------------
// File: DXMUTGui.cs
//
// DirectX SDK Managed Direct3D GUI Sample Code
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//--------------------------------------------------------------------------------------
using System;
using System.Collections;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

namespace Microsoft.Samples.DirectX.UtilityToolkit
{
    /// <summary>
    /// Predefined control types
    /// </summary>
    public enum ControlType
    {
        StaticText,
        Button,
        CheckBox,
        RadioButton,
        ComboBox,
        Slider,
        ListBox,
        EditBox,
        Scrollbar,
    }

    /// <summary>
    /// Possible states of a control
    /// </summary>
    public enum ControlState
    {
        Normal,
        Disabled,
        Hidden,
        Focus,
        MouseOver,
        Pressed,
        LastState // Should always be last
    }

    /// <summary>
    /// Blends colors
    /// </summary>
    public struct BlendColor
    {
        public ColorValue[] States; // Modulate colors for all possible control states
        public ColorValue Current; // Current color

        /// <summary>Initialize the color blending</summary>
        public void Initialize(ColorValue defaultColor, ColorValue disabledColor, ColorValue hiddenColor)
        {
            // Create the array
            States = new ColorValue[(int)ControlState.LastState];
            for(int i = 0; i < States.Length; i++)
            {
                States[i] = defaultColor;
            }

            // Store the data
            States[(int)ControlState.Disabled] = disabledColor;
            States[(int)ControlState.Hidden] = hiddenColor;
            Current = hiddenColor;
        }
        /// <summary>Initialize the color blending</summary>
        public void Initialize(ColorValue defaultColor) { Initialize( defaultColor, new ColorValue(0.5f, 0.5f, 0.5f, 0.75f),new ColorValue()); }

        /// <summary>Blend the colors together</summary>
        public void Blend(ControlState state, float elapsedTime, float rate)
        {
            if ((States == null) || (States.Length == 0) )
                return; // Nothing to do

            ColorValue destColor = States[(int)state];
            Current = ColorOperator.Lerp(Current, destColor, 1.0f - (float)Math.Pow(rate, 30 * elapsedTime) );
        }
        /// <summary>Blend the colors together</summary>
        public void Blend(ControlState state, float elapsedTime) { Blend(state, elapsedTime, 0.7f); }
    }

    /// <summary>
    /// Contains all the display information for a given control type
    /// </summary>
    public struct ElementHolder
    {
        public ControlType ControlType;
        public uint ElementIndex;
        public Element Element;
    }

    /// <summary>
    /// Contains all the display tweakables for a sub-control
    /// </summary>
    public class Element : ICloneable
    {
        #region Magic Numbers
        #endregion

        #region Instance Data
        public uint TextureIndex; // Index of the texture for this Element 
        public uint FontIndex; // Index of the font for this Element 
        public DrawTextFormat textFormat; // The Format argument to draw text

        public System.Drawing.Rectangle textureRect; // Bounding rectangle of this element on the composite texture

        public BlendColor TextureColor;
        public BlendColor FontColor;
        #endregion

        /// <summary>Set the texture</summary>
        public void SetTexture(uint tex, System.Drawing.Rectangle texRect, ColorValue defaultTextureColor)
        {
            // Store data
            TextureIndex = tex;
            textureRect = texRect;
            TextureColor.Initialize(defaultTextureColor);
        }
        /// <summary>Set the texture</summary>
        public void SetTexture(uint tex, System.Drawing.Rectangle texRect) { SetTexture(tex, texRect, Dialog.WhiteColorValue); }
        /// <summary>Set the font</summary>
        public void SetFont(uint font, ColorValue defaultFontColor, DrawTextFormat format)
        {
            // Store data
            FontIndex = font;
            textFormat = format;
            FontColor.Initialize(defaultFontColor);
        }
        /// <summary>Set the font</summary>
        public void SetFont(uint font){ SetFont(font, Dialog.WhiteColorValue, DrawTextFormat.Center | DrawTextFormat.VerticalCenter ); }
        /// <summary>
        /// Refresh this element
        /// </summary>
        public void Refresh()
        {
            if (TextureColor.States != null) 
                TextureColor.Current = TextureColor.States[(int)ControlState.Hidden];
            if (FontColor.States != null) 
                FontColor.Current = FontColor.States[(int)ControlState.Hidden];
        }

        #region ICloneable Members
        /// <summary>Clone an object</summary>
        public Element Clone() 
        { 
            Element e = new Element();
            e.TextureIndex = this.TextureIndex;
            e.FontIndex = this.FontIndex;
            e.textFormat = this.textFormat;
            e.textureRect = this.textureRect; 
            e.TextureColor = this.TextureColor;
            e.FontColor = this.FontColor;

            return e;
        }
        /// <summary>Clone an object</summary>
        object ICloneable.Clone() { throw new NotSupportedException("Use the strongly typed clone.");}

        #endregion
    }


    #region Dialog Resource Manager
    /// <summary>
    /// Structure for shared textures
    /// </summary>
    public class TextureNode 
    {
        public string Filename;
        public Texture Texture;
        public uint Width;
        public uint Height;
    }

    /// <summary>
    /// Structure for shared fonts
    /// </summary>
    public class FontNode 
    {
        public string FaceName;
        public Font Font;
        public uint Height;
        public FontWeight Weight;
    }

    /// <summary>
    /// Manages shared resources of dialogs
    /// </summary>
    public sealed class DialogResourceManager
    {
        private StateBlock dialogStateBlock;  // Stateblock shared amongst all dialogs
        private Sprite dialogSprite; // Sprite used for drawing
        public StateBlock StateBlock { get { return dialogStateBlock; } }
        public Sprite Sprite { get { return dialogSprite; } }
        private Device device; // Device

        // Lists of textures/fonts
        private ArrayList textureCache = new ArrayList();
        private ArrayList fontCache = new ArrayList();

        #region Creation
        /// <summary>Do not allow creation</summary>
        private DialogResourceManager()  {
            device = null;
            dialogSprite = null;
            dialogStateBlock = null;
        } 

        private static DialogResourceManager localObject = null;
        public static DialogResourceManager GetGlobalInstance()
        {
            if (localObject == null)
                localObject = new DialogResourceManager();

            return localObject;
        }
        #endregion

        /// <summary>Gets a font node from the cache</summary>
        public FontNode GetFontNode(int index) { return fontCache[index] as FontNode; }
        /// <summary>Gets a texture node from the cache</summary>
        public TextureNode GetTextureNode(int index) { return textureCache[index] as TextureNode; }
        /// <summary>Gets the device</summary>
        public Device Device { get { return device; } }

        /// <summary>
        /// Adds a font to the resource manager
        /// </summary>
        public int AddFont(string faceName, uint height, FontWeight weight)
        {
            // See if this font exists
            for(int i = 0; i < fontCache.Count; i++)
            {
                FontNode fn = fontCache[i] as FontNode;
                if ( (string.Compare(fn.FaceName, faceName, true) == 0) &&
                    fn.Height == height &&
                    fn.Weight == weight)
                {
                    // Found it
                    return i;
                }
            }

            // Doesn't exist, add a new one and try to create it
            FontNode newNode = new FontNode();
            newNode.FaceName = faceName;
            newNode.Height = height;
            newNode.Weight = weight;
            fontCache.Add(newNode);

            int fontIndex = fontCache.Count-1;
            // If a device is available, try to create immediately
            if (device != null)
                CreateFont(fontIndex);

            return fontIndex;
        }
        /// <summary>
        /// Adds a texture to the resource manager
        /// </summary>
        public int AddTexture(string filename)
        {
            // See if this font exists
            for(int i = 0; i < textureCache.Count; i++)
            {
                TextureNode tn = textureCache[i] as TextureNode;
                if (string.Compare(tn.Filename, filename, true) == 0)
                {
                    // Found it
                    return i;
                }
            }
            // Doesn't exist, add a new one and try to create it
            TextureNode newNode = new TextureNode();
            newNode.Filename = filename;
            textureCache.Add(newNode);

            int texIndex = textureCache.Count-1;

            // If a device is available, try to create immediately
            if (device != null)
                CreateTexture(texIndex);

            return texIndex;

        }

        /// <summary>
        /// Creates a font
        /// </summary>
        public void CreateFont(int font)
        {
            // Get the font node here
            FontNode fn = GetFontNode(font);
            if (fn.Font != null)
                fn.Font.Dispose(); // Get rid of this

            // Create the new font
            fn.Font = new Font(device, (int)fn.Height, 0, fn.Weight, 1, false, CharacterSet.Default,
                Precision.Default, FontQuality.Default, PitchAndFamily.DefaultPitch | PitchAndFamily.FamilyDoNotCare,
                fn.FaceName);
        }

        /// <summary>
        /// Creates a texture
        /// </summary>
        public void CreateTexture(int tex)
        {
            // Get the texture node here
            TextureNode tn = GetTextureNode(tex);