using System;
using System.Text;
using System.Collections.Generic;

namespace BizHawk.MultiClient
{
	/// <summary>
	/// will hold buttons for 1 frame and then release them. (Calling Click() from your button click is what you want to do)
	/// TODO - should the duration be controllable?
	/// </summary>
	public class ClickyVirtualPadController : IController
	{
		public ControllerDefinition Type { get; set; }
		public bool this[string button] { get { return IsPressed(button); } }
		public float GetFloat(string name) { return 0.0f; } //TODO
		public void UpdateControls(int frame) { }
		public bool IsPressed(string button)
		{
			return Pressed.Contains(button);
		}
		/// <summary>
		/// call this once per frame to do the timekeeping for the hold and release
		/// </summary>
		public void FrameTick()
		{
			Pressed.Clear();
		}

		/// <summary>
		/// call this to hold the button down for one frame
		/// </summary>
		public void Click(string button)
		{
			Pressed.Add(button);
		}

		HashSet<string> Pressed = new HashSet<string>();
	}

	//filters input for things called Up and Down while considering the client's AllowUD_LR option.
	//this is a bit gross but it is unclear how to do it more nicely
	public class UD_LR_ControllerAdapter : IController
	{
		public ControllerDefinition Type { get { return Source.Type; } }
		public IController Source;

		public bool this[string button] { get { return IsPressed(button); } }
		public float GetFloat(string name) { return 0.0f; } //TODO
		public void UpdateControls(int frame) { }

		public bool IsPressed(string button)
		{
			if (Global.Config.AllowUD_LR == true)
				return Source.IsPressed(button);

			string prefix;

			if (button.Contains("Down"))
			{
				prefix = button.GetPrecedingString("Down");
				if (Source.IsPressed(prefix + "Up"))
					return false;
			}
			if (button.Contains("Right"))
			{
				prefix = button.GetPrecedingString("Right");
				if (Source.IsPressed(prefix + "Left"))
					return false;
			}

			return Source.IsPressed(button);
		}
	}

	public class SimpleController : IController
	{
		public ControllerDefinition Type { get; set; }

		protected WorkingDictionary<string, bool> Buttons = new WorkingDictionary<string, bool>();
		public virtual bool this[string button] { get { return Buttons[button]; } set { Buttons[button] = value; } }
		public virtual bool IsPressed(string button) { return this[button]; }
		public float GetFloat(string name) { return 0.0f; } //TODO
		public void UpdateControls(int frame) { }

		public IEnumerable<KeyValuePair<string, bool>> BoolButtons()
		{
			foreach (var kvp in Buttons) yield return kvp;
		}

		public virtual void LatchFrom(IController source)
		{
			foreach (string button in source.Type.BoolButtons)
			{
				Buttons[button] = source[button];
			}
		}
	}

	public class ORAdapter : IController
	{
		public bool IsPressed(string button) { return this[button]; }
		public float GetFloat(string name) { return 0.0f; } //TODO
		public void UpdateControls(int frame) { }

		public IController Source;
		public IController SourceOr;
		public ControllerDefinition Type { get { return Source.Type; } set { throw new InvalidOperationException(); } }

		public bool this[string button]
		{
			get
			{
				bool source = Source[button] | SourceOr[button];
				return source;
			}
			set { throw new InvalidOperationException(); }
		}

	}

	public class StickyXORAdapter : IController
	{
		private HashSet<string> stickySet = new HashSet<string>();
		public IController Source;

		public ControllerDefinition Type { get { return Source.Type; } set { throw new InvalidOperationException(); } }

		public bool IsPressed(string button) { return this[button]; }
		public float GetFloat(string name) { return 0.0f; } //TODO
		public void UpdateControls(int frame) { }

		public bool this[string button] { 
			get 
			{
				bool source = Source[button];
				if (source)
				{
				}
				source ^= stickySet.Contains(button);
				return source;
			}
			set { throw new InvalidOperationException(); }
		}

		public void SetSticky(string button, bool isSticky)
		{
			if(isSticky)
				stickySet.Add(button);
			else stickySet.Remove(button);
		}

		public bool IsSticky(string button)
		{
			return stickySet.Contains(button);
		}
	}

	public class MnemonicsGenerator
	{
		IController Source;
		public void SetSource(IController source)
		{
			Source = source;
			ControlType = source.Type.Name;
		}
		string ControlType;

		bool IsBasePressed(string name)
		{
			bool ret = Source.IsPressed(name);
			if (ret)
			{
				//int zzz=9;
			}
			return ret;
		}

		public string GetControllersAsMnemonic()
		{
			if (Global.Emulator.SystemId == "NULL" || ControlType == "Null Controller")
				return "|.|";

			StringBuilder input = new StringBuilder("|");

			if (
				ControlType == "Genesis 3-Button Controller" || ControlType == "Gameboy Controller" ||
				ControlType == "PC Engine Controller"
			)
			{
				input.Append(".");
			}
			if (ControlType == "Atari 2600 Basic Controller")
			{
				input.Append(IsBasePressed("Reset") ? "r" : ".");
				input.Append(IsBasePressed("Select") ? "s" : ".");
			}
			if (ControlType == "NES Controller")
			{
				input.Append(IsBasePressed("Reset") ? Global.COMMANDS[ControlType]["Reset"] :
					Global.Emulator.IsLagFrame ? Global.COMMANDS[ControlType]["Lag"] : ".");
			}
			if (ControlType != "SMS Controller" && ControlType != "TI83 Controller")
			{
				input.Append("|");
			}
			for (int player = 1; player <= Global.PLAYERS[ControlType]; player++)
			{
				string prefix = "";
				if (ControlType != "Gameboy Controller" && ControlType != "TI83 Controller")
				{
					prefix = "P" + player.ToString() + " ";
				}
				foreach (string button in Global.BUTTONS[ControlType].Keys)
				{
					input.Append(IsBasePressed(prefix + button) ? Global.BUTTONS[ControlType][button] : ".");
				}
				input.Append("|");
			}
			if (ControlType == "SMS Controller")
			{
				foreach (string command in Global.COMMANDS[ControlType].Keys)
				{
					input.Append(IsBasePressed(command) ? Global.COMMANDS[ControlType][command] : ".");
				}
				input.Append("|");
			}
			if (ControlType == "TI83 Controller")
			{
				input.Append(".|"); //TODO: perhaps ON should go here?
			}
			return input.ToString();
		}
	}
	/// <summary>
	/// just copies source to sink, or returns whatever a NullController would if it is disconnected. useful for immovable hardpoints.
	/// </summary>
	public class CopyControllerAdapter : IController
	{
		public IController Source;
		NullController _null = new NullController();

		IController Curr
		{
			get
			{
				if (Source == null) return _null;
				else return Source;
			}
		}

		public ControllerDefinition Type { get { return Curr.Type; } }
		public bool this[string button] { get { return Curr[button]; } }
		public bool IsPressed(string button) { return Curr.IsPressed(button); }
		public float GetFloat(string name) { return Curr.GetFloat(name); }
		public void UpdateControls(int frame) { Curr.UpdateControls(frame); }
	}

	class ButtonNameParser
	{
		ButtonNameParser()
		{
		}

		public static ButtonNameParser Parse(string button)
		{
			//see if we're being asked for a button that we know how to rewire
			string[] parts = button.Split(' ');
			if (parts.Length < 2) return null;
			if (parts[0][0] != 'P') return null;
			int player = 0;
			if (!int.TryParse(parts[0].Substring(1), out player))
				return null;
			var bnp = new ButtonNameParser();
			bnp.PlayerNum = player;
			bnp.ButtonPart = button.Substring(parts[0].Length + 1);
			return bnp;
		}

		public int PlayerNum;
		public string ButtonPart;

		public override string ToString()
		{
			return string.Format("P{0} {1}", PlayerNum, ButtonPart);
		}
	}

	/// <summary>
	/// rewires player1 controls to playerN
	/// </summary>
	public class MultitrackRewiringControllerAdapter : IController
	{
		public IController Source;
		public int PlayerSource = 1;
		public int PlayerTargetMask = 0;

		public ControllerDefinition Type { get { return Source.Type; } }
		public bool this[string button] { get { return this.IsPressed(button); } }
		public float GetFloat(string name) { return Source.GetFloat(name); }
		public void UpdateControls(int frame) { Source.UpdateControls(frame); }

		public bool IsPressed(string button)
		{
			//do we even have a source?
			if (PlayerSource == -1) return Source.IsPressed(button);

			//see if we're being asked for a button that we know how to rewire
			ButtonNameParser bnp = ButtonNameParser.Parse(button);
			if (bnp == null) return Source.IsPressed(button);

			//ok, this looks like a normal `P1 Button` type thing. we can handle it
			//were we supposed to replace this one?
			int foundPlayerMask = (1 << bnp.PlayerNum);
			if ((PlayerTargetMask & foundPlayerMask) == 0) return Source.IsPressed(button);
			//ok, we were. swap out the source player and then grab his button
			bnp.PlayerNum = PlayerSource;
			return Source.IsPressed(bnp.ToString());
		}
	}

	public class MovieControllerAdapter : IController
	{
		public MovieControllerAdapter()
		{
			//OutputController = new ForceControllerAdapter();
		}

		//IController implementation:
		public ControllerDefinition Type { get; set; }
		public bool this[string button] { get { return MyBoolButtons[button]; } }
		public bool IsPressed(string button) { return MyBoolButtons[button]; }
		public float GetFloat(string name) { return 0; }
		public void UpdateControls(int frame) {  }
		//--------

		WorkingDictionary<string, bool> MyBoolButtons = new WorkingDictionary<string, bool>();

		void Force(string button, bool state)
		{
			MyBoolButtons[button] = state;
		}

		string ControlType { get { return Type.Name; } }

		class MnemonicChecker
		{
			public MnemonicChecker(string _m)
			{
				m = _m;
			}
			string m;
			public bool this[int c]
			{
				get { return m[c] != '.'; }
			}
		}

		/// <summary>
		/// latches one player from the source
		/// </summary>
		public void LatchPlayerFromSource(IController playerSource, int playerNum)
		{
			foreach (string button in playerSource.Type.BoolButtons)
			{
				ButtonNameParser bnp = ButtonNameParser.Parse(button);
				if (bnp == null) continue;
				if (bnp.PlayerNum != playerNum) continue;
				bool val = playerSource[button];
				MyBoolButtons[button] = val;
			}
		}

		/// <summary>
		/// latches all buttons from the provided source
		/// </summary>
		public void LatchFromSource(IController source)
		{
			foreach (string button in Type.BoolButtons)
			{
				MyBoolButtons[button] = source[button];
			}
		}

		/// <summary>
		/// latches all buttons from the supplied mnemonic string
		/// </summary>
		public void SetControllersAsMnemonic(string mnemonic)
		{
			if (Global.Emulator.SystemId == "NULL" || ControlType == "Null Controller")
				return;
			MnemonicChecker c = new MnemonicChecker(mnemonic);

			MyBoolButtons.Clear();

			int start = 3;
			if (ControlType == "NES Controller")
			{
				if (mnemonic.Length < 2) return;
				Force("Reset", mnemonic[1] != '.' && mnemonic[1] != '0' && mnemonic[1] != 'l');
			}
			if (ControlType == "SMS Controller" || ControlType == "TI83 Controller")
			{
				start = 1;
			}
			if (ControlType == "Atari 2600 Basic Controller")
			{
				Force("Reset", mnemonic[1] != '.' && mnemonic[1] != '0');
				Force("Select", mnemonic[2] != '.' && mnemonic[2] != '0');
				start = 4;
			}
			for (int player = 1; player <= Global.PLAYERS[ControlType]; player++)
			{
				int srcindex = (player - 1) * (Global.BUTTONS[ControlType].Count + 1);
				int ctr = start;
				if (mnemonic.Length < srcindex + ctr + Global.BUTTONS[ControlType].Count - 1)
				{
					return;
				}
				string prefix = "";
				if (ControlType != "Gameboy Controller" && ControlType != "TI83 Controller")
				{
					prefix = "P" + player + " ";
				}
				foreach (string button in Global.BUTTONS[ControlType].Keys)
				{
					Force(prefix + button, c[srcindex + ctr++]);
				}
			}
			if (ControlType == "SMS Controller")
			{
				int srcindex = Global.PLAYERS[ControlType] * (Global.BUTTONS[ControlType].Count + 1);
				int ctr = start;
				foreach (string command in Global.COMMANDS[ControlType].Keys)
				{
					Force(command, c[srcindex + ctr++]);
				}
			}
		}
	}

	//not being used..

	///// <summary>
	///// adapts an IController to force some buttons to a different state.
	///// unforced button states will flow through to the adaptee
	///// </summary>
	//public class ForceControllerAdapter : IController
	//{
	//    public IController Controller;

	//    public Dictionary<string, bool> Forces = new Dictionary<string, bool>();
	//    public void Clear()
	//    {
	//        Forces.Clear();
	//    }

	//    public ControllerDefinition Type { get { return Controller.Type; } }

	//    public bool this[string button] { get { return IsPressed(button); } }

	//    public bool IsPressed(string button)
	//    {
	//        if (Forces.ContainsKey(button))
	//            return Forces[button];
	//        else return Controller.IsPressed(button);
	//    }

	//    public float GetFloat(string name)
	//    {
	//        return Controller.GetFloat(name); //TODO!
	//    }

	//    public void UpdateControls(int frame)
	//    {
	//        Controller.UpdateControls(frame);
	//    }
	//}
}