using System.IO;

using Delta.Engine;

using Delta.Engine.Dynamic;

using Delta.InputSystem;

using Delta.Scenes.Enums;

using Delta.Utilities;

using Delta.Utilities.Datatypes;

using Delta.Utilities.Datatypes.Advanced;

using NUnit.Framework;



namespace Delta.Scenes.UserInterfaces.Controls

{

	/// <summary>

	/// This is a radio button control which provides to select always only one

	/// option of a choice of several options. The list of options will be

	/// grouped by setting the 'GroupObject' property.

	/// </summary>

	public class RadioButton : Checkbox

	{

		#region Constants

		/// <summary>

		/// The current version of the implementation of this class.

		/// </summary>

		private const int VersionNumber = 1;

		#endregion



		#region GroupObject (Public)

		/// <summary>

		/// The "group object" where this RadioButton belongs to.

		/// </summary>

		/// <value>

		/// The group object.

		/// </value>

		public ISaveLoadBinary GroupObject

		{

			get;

			set;

		}

		#endregion



		#region Protected



		#region FallbackDesign (Protected)

		/// <summary>

		/// Defines the theme which will be used if no "Theme" was set explicitely.

		/// </summary>

		protected override ControlDesign FallbackDesign

		{

			get

			{

				return Theme.Current.RadioButtonDesign;

			}

		}

		#endregion



		#endregion



		#region Constructors

		/// <summary>

		/// Create a radio button.

		/// </summary>

		public RadioButton()

		{

			GroupObject = null;

		}

		#endregion



		#region Save (Public)

		/// <summary>

		/// Saves all data which are necessary to restore the object again.

		/// </summary>

		/// <param name="dataWriter">

		/// The writer which contains the stream where the data should be saved

		/// into now.

		/// </param>

		public override void Save(BinaryWriter dataWriter)

		{

			// At first we write the data of the base class

			base.Save(dataWriter);



			// and then save the version of the current data format

			dataWriter.Write(VersionNumber);



			// before we can finally save the properties

			// Here we only have to save the "grouping object"

			bool isGroupObjectAvaiable = GroupObject != null;

			dataWriter.Write(isGroupObjectAvaiable);

			if (isGroupObjectAvaiable)

			{

				Factory.Save(dataWriter, GroupObject);

			} // if

		}

		#endregion



		#region Load (Public)

		/// <summary>

		/// Loads and restores all previously saved values that belongs to this

		/// class only from the given data reader.

		/// </summary>

		/// <param name="dataReader">The reader which contains the stream with the saved data which needs to

		/// be loaded now.</param>

		public override void Load(BinaryReader dataReader)

		{

			// At first we need to load all data of the base class

			base.Load(dataReader);



			// and then check which version of the data need to load now

			int version = dataReader.ReadInt32();

			switch (version)

			{

					// Version 1

				case VersionNumber:

					// Load our group object if there was one

					if (dataReader.ReadBoolean())

					{

						GroupObject = Factory.Load<ISaveLoadBinary>(dataReader);

					} // if

					break;



				default:

					Log.InvalidVersionWarning(GetType().Name, version, VersionNumber);

					break;

			} // switch

		}

		#endregion



		#region Methods (Private)



		#region OnClicked

		/// <summary>

		/// On clicked

		/// </summary>

		/// <param name="input">Input data like the click position.</param>

		/// <param name="isInsideControl">

		/// 'True' if the event is occurring inside the control, otherwise 'false'.

		/// </param>

		protected override void OnClicked(CommandTrigger input,

			bool isInsideControl)

		{

			base.OnClicked(input, isInsideControl);



			if (isInsideControl)

			{

				// Make sure the user can't uncheck the RadioButton by clicking

				// on it again because we no Checkbox anymore ;)

				// So in the case the user has currently unchecked the button (by the

				// base code call) then just make it checked again.

				// Note:

				// This will also prevent a value change detection

				if (IsChecked == false)

				{

					IsChecked = true;

				} // if

			} // if

		}

		#endregion



		#region OnIsCheckedChanging

		/// <summary>

		/// On is checked changing

		/// </summary>

		/// <param name="oldIsChecked">Old value</param>

		/// <returns>

		/// 'True' if the new value can be used or 'false' if the change should be

		/// aborted.

		/// </returns>

		protected override bool OnIsCheckedChanging(bool oldIsChecked)

		{

			// Next check if the base code will not abort the change already

			if (base.OnIsCheckedChanging(oldIsChecked) == false)

			{

				return false;

			} // if



			// If we will be checked now, then we have uncheck all other RadioButton

			// members of our group

			if (IsChecked &&

			    oldIsChecked == false)

			{

				// If our RadioButton has a group set, then receive all other

				// "group members", else if we don't are in a group then we are only

				// the member.

				RadioButton[] buttonsInGroup =

					(GroupObject != null)

						? (Screen as Screen).GetRadioButtons(GroupObject)

						: new[]

						{

							this

						};



				// Iterate through all members

				foreach (RadioButton radioButton in buttonsInGroup)

				{

					// and "deactivate" all the other members

					if (radioButton != this)

					{

						radioButton.IsChecked = false;

					} // if

				} // foreach

			} // if



			// In the case that we are only deactivated or already checked we don't

			// need to anything here because everything was done already in the

			//"base code"

			return true;

		}

		#endregion



		#endregion



		/// <summary>

		/// Tests for RadioButton controls

		/// </summary>

		[Category("Visual")]

		internal class RadioButtonTests

		{

			#region DisplayRadioButton (Static)

			/// <summary>

			/// Checkbox

			/// </summary>

			[Test]

			public static void DisplayRadioButton()

			{

				// The used UI scene for the unit test

				Screen testScene = new Screen();



				// Create a grouping condition to which both radio buttons belong to

				ISaveLoadBinary groupTag = new DataContainer

				{

					StringData = "Group 1",

				};



				RadioButton radioButtonOne = new RadioButton

				{

					LocalArea = new Rectangle(0.3f, 0.3f, 0.4f, 0.05f),

					//Size = new Size(0.6f, 0.1f),

					GroupObject = groupTag,

					Text = "Option A",

				};

				testScene.Add(radioButtonOne);



				RadioButton radioButtonTwo = new RadioButton

				{

					LocalArea = new Rectangle(0.3f, 0.4f, 0.4f, 0.05f),

					//Size = new Size(0.6f, 0.1f),

					GroupObject = groupTag,

					Text = "Option B",

				};

				testScene.Add(radioButtonTwo);



				RadioButton radioButtonThree = new RadioButton

				{

					LocalArea = new Rectangle(0.3f, 0.5f, 0.4f, 0.05f),

					//Size = new Size(0.6f, 0.1f),

					GroupObject = groupTag,

					Text = "Option C",

				};

				testScene.Add(radioButtonThree);



				// Open now the scene to "activate" for the test

				testScene.Open();



				// We just call here Application.Start() to display the image, but we

				// don't need to call the "Image.Draw()" explicitely, because this

				// already handled automatically by the UI manager

				Application.Start();

			}

			#endregion



			#region DisabledRadioButton (Static)

			/// <summary>

			/// Disabled radio button

			/// </summary>

			[Test]

			public static void DisabledRadioButton()

			{

				// The used UI scene for the unit test

				Screen testScene = new Screen();



				// Create a grouping condition to which both radio buttons belong to

				BaseControl groupTag = new Image();



				RadioButton radioButton1 = new RadioButton

				{

					LocalArea = new Rectangle(0.3f, 0.3f, 0.4f, 0.05f),

					//Size = new Size(0.6f, 0.1f),

					GroupObject = groupTag,

					Text = "Enabled",

				};

				testScene.Add(radioButton1);



				RadioButton radioButton2 = new RadioButton

				{

					LocalArea = new Rectangle(0.3f, 0.4f, 0.4f, 0.05f),

					//Size = new Size(0.6f, 0.1f),

					GroupObject = groupTag,

					Text = "Enabled",

				};

				testScene.Add(radioButton2);



				// Open now the scene to "activate" for the test

				testScene.Open();



				Application.Start(delegate

				{

					// Start the visual test to see the RadioButton's



					// Disable/enable the RadioButton's by pressing the "Space" key

					if (Input.Keyboard.SpaceReleased)

					{

						radioButton1.State = (radioButton1.State >= ElementState.Enabled)

						                     	? ElementState.Disabled

						                     	: ElementState.Enabled;

						radioButton1.Text = radioButton1.State.ToString();



						radioButton2.State = (radioButton2.State >= ElementState.Enabled)

						                     	? ElementState.Disabled

						                     	: ElementState.Enabled;

						radioButton2.Text = radioButton2.State.ToString();

					} // if

				});

			}

			#endregion

		}

	}

}