/*
The MIT License

Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using Chronos.Extensions.Windows;

namespace Chronos.Presentation.Windows.Controls
{
    /// <summary>
    /// Provides the ability to create, configure, show, and manage the lifetime of widgets
    /// </summary>
    [TemplatePart(Name = WidgetElement.PART_MinimizeButton, Type = typeof(ButtonBase))]
    [TemplatePart(Name = WidgetElement.PART_CloseButton, Type = typeof(ButtonBase))]
    [TemplatePart(Name = WidgetElement.PART_ContentPresenter, Type = typeof(ContentPresenter))]
    public class WidgetElement 
        : DesktopElement
    {
        #region · Constants ·

        private const string PART_ContentPresenter  = "PART_ContentPresenter";
        private const string PART_MinimizeButton    = "PART_MinimizeButton";
        private const string PART_CloseButton       = "PART_CloseButton";

        #endregion
            
        #region · Dependency Properties ·

        /// <summary>
        /// Identifies the Title dependency property.
        /// </summary>
        public static readonly DependencyProperty TitleProperty =
            DependencyProperty.Register("Title", typeof(String), typeof(WidgetElement),
                new FrameworkPropertyMetadata(String.Empty));

        /// <summary>
        /// Identifies the WindowState dependency property.
        /// </summary>
        public static readonly DependencyProperty WidgetStateProperty =
            DependencyProperty.Register("WidgetState", typeof(WindowState), typeof(WidgetElement),
                new FrameworkPropertyMetadata(WindowState.Normal));

        /// <summary>
        /// Identifies the ShowMinimizeButton dependency property.
        /// </summary>
        public static readonly DependencyProperty ShowMinimizeButtonProperty =
            DependencyProperty.Register("ShowMinimizeButton", typeof(bool), typeof(WidgetElement),
                new FrameworkPropertyMetadata(true));

        #endregion

        #region · Routed Commands ·

        /// <summary>
        /// Minimize window command
        /// </summary>
        public static RoutedCommand MinimizeCommand;

        #endregion

        #region · Static Constructor ·

        /// <summary>
        /// Initializes the <see cref="WidgetElement"/> class.
        /// </summary>
        static WidgetElement()
        {
            WidgetElement.DefaultStyleKeyProperty.OverrideMetadata(typeof(WidgetElement),
                new FrameworkPropertyMetadata(typeof(WidgetElement)));

            WidgetElement.MinimizeCommand = new RoutedCommand("Minimize", typeof(WidgetElement));

            Control.IsTabStopProperty.OverrideMetadata(typeof(WidgetElement),
                new FrameworkPropertyMetadata(false));

            KeyboardNavigation.DirectionalNavigationProperty.OverrideMetadata(
                typeof(WidgetElement), new FrameworkPropertyMetadata(KeyboardNavigationMode.Cycle));

            KeyboardNavigation.TabNavigationProperty.OverrideMetadata(
                typeof(WidgetElement), new FrameworkPropertyMetadata(KeyboardNavigationMode.Cycle));

            KeyboardNavigation.ControlTabNavigationProperty.OverrideMetadata(
                typeof(WidgetElement), new FrameworkPropertyMetadata(KeyboardNavigationMode.Once));

            if (!DesignMode.IsInDesignMode
                && Application.Current.GetRenderTier() != RenderTier.Tier2)
            {
                WidgetElement.CacheModeProperty.OverrideMetadata(typeof(WidgetElement),
                    new FrameworkPropertyMetadata(new BitmapCache { EnableClearType = true, RenderAtScale = 1, SnapsToDevicePixels = true }));
            }
        }

        #endregion

        #region · Fields ·

        private Size previousSize;

        #endregion

        #region · Properties ·

        /// <summary>
        /// Gets or sets a value that indicates whether a window is restored or minimized. 
        /// This is a dependency property.
        /// </summary>
        /// <value>A <see cref="WindowState"/> that determines whether a window is restored, minimized, or maximized. The default is Normal (restored).</value>
        public WindowState WidgetState
        {
            get { return (WindowState)base.GetValue(WidgetStateProperty); }
            set
            {
                if ((WindowState)this.GetValue(WidgetStateProperty) != value)
                {
                    base.SetValue(WidgetStateProperty, value);
                }

                this.AdjustLayout();
            }
        }

        /// <summary>
        /// Gets a value that indicates whether the minimize button is visible. 
        /// This is a dependency property. 
        /// </summary>
        public bool ShowMinimizeButton
        {
            get { return (bool)base.GetValue(ShowMinimizeButtonProperty); }
            set { base.SetValue(ShowMinimizeButtonProperty, value); }
        }

        /// <summary>
        /// Gets or sets the Widget title 
        /// </summary>
        public string Title
        {
            get { return (string)base.GetValue(TitleProperty); }
            set { base.SetValue(TitleProperty, value); }
        }

        #endregion

        #region · Internal Properties ·

        /// <summary>
        /// Gets the Widget real Height based on the <see cref="WidgetState"/>.
        /// </summary>
        /// <remarks>Used for Widget serialization on <see cref="DesktopSerializer"/> class</remarks>
        internal double RealHeight
        {
            get
            {
                if (this.WidgetState == WindowState.Minimized)
                {
                    return this.previousSize.Height;
                }

                return this.Height;
            }
        }

        #endregion

        #region · Constructors ·

        /// <summary>
        /// Initializes a new instance of the <see cref="WidgetElement"/> class.
        /// </summary>
        public WidgetElement()
            : base()
        {
            CommandBinding bindingMinimize = new CommandBinding(WidgetElement.MinimizeCommand, new ExecutedRoutedEventHandler(this.OnMinimizeWindow));
            this.CommandBindings.Add(bindingMinimize);
        }

        #endregion

        #region · Methods ·

        /// <summary>
        /// Closes the desktop element
        /// </summary>
        public override void Close()
        {
            this.CommandBindings.Clear();

            base.Close();
        }

        #endregion

        #region · Protected Methods
        
        /// <summary>
        /// Focuses the window
        /// </summary>
        protected override void GiveFocus()
        {
            this.MoveFocus(FocusNavigationDirection.Next);
        }

        #endregion

        #region · Command Actions ·

        /// <summary>
        /// Occurs when the widget is going to be minimized
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnMinimizeWindow(object sender, ExecutedRoutedEventArgs e)
        {
            if (this.WidgetState != WindowState.Minimized)
            {
                this.WidgetState = WindowState.Minimized;
            }
            else
            {
                this.WidgetState = WindowState.Normal;
            }
        }

        #endregion

        #region · Private Methods ·
        
        private void AdjustLayout()
        {
            if (this.WidgetState == WindowState.Minimized)
            {
                this.previousSize   = new Size(this.Width, this.Height);
                this.Height         = 35;
                this.CanResize      = false;
            }
            else
            {
                this.Height         = this.previousSize.Height;
                this.previousSize   = new Size(this.Width, this.Height);
                this.CanResize      = true;
            }
        }

        #endregion
    }
}