using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using log4net;
using ShipHandling;
using UnityEngine;
using UnityEngine.InputSystem;
using static InputActionMaps;

namespace Managers
{
	public class ControlsManager : MonoBehaviour
	{
		private static ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

		/// <summary>
		/// Globally accessible member to use manager with.
		/// </summary>
		public static ControlsManager G { get; private set; }
		private Dictionary<int, UniqueControl> playersControlSchemes = new Dictionary<int, UniqueControl>();
		public Dictionary<int, Player> unassignedPlayers = new Dictionary<int, Player>();
		public EventHandler<Tuple<int, UniqueControl>> PlayerControlAssigned;
		private ControlSchemeDetection controlSchemeDetector;

		void Awake()
		{
			G = this;
			Log.Info("Awake");
		}

		public void AssignControlsToPlayers(List<Player> players)
		{
			playersControlSchemes?.Clear();
			foreach (Player p in players)
			{
				if (p.character.shipInput != null)
				{
					ShipInputHandler input = p.character.shipInput;
					// TODO: Make this more unique with the GUID and save across more
					// and different scenarios?
					playersControlSchemes.Add(p.playerNumber,
					new UniqueControl()
					{
						SchemeName = input.user.controlScheme.Value.name,
						DeviceId = input.user.pairedDevices[0].deviceId
					});

					// TODO: Show some kind of hint which control scheme this player
					// is using.
					// TODO: Needs a possibility to change controls easily.
				}
				else
				{
					unassignedPlayers.Add(p.playerNumber, p);
				}
			}
			StartControlSchemeDetection();
		}

		public void StartControlSchemeDetection()
		{
			controlSchemeDetector = new ControlSchemeDetection();
			controlSchemeDetector.ControlSchemeDetected +=
				(obj, uniqueControl) => DetectPlayerControls(uniqueControl);
			controlSchemeDetector.EnableDetection();
		}

		private void DetectPlayerControls(UniqueControl uc)
		{
			if (unassignedPlayers.Count == 0)
			{
				controlSchemeDetector.DisableDetection();
				Log.Debug("No player without controls left.");
				return;
			}
			int playerId = unassignedPlayers.Keys.First();

			if (playersControlSchemes.ContainsValue(uc))
			{
				Log.Warn("These controls can't be assigned to a second player.");
				return;
			}

			unassignedPlayers[playerId].spawnedCharacter.TryGetComponent(out Ship s);

			AssignShipControls(uc, s, unassignedPlayers[playerId].character);
			Log.Info($"Player Number: {playerId} got assigned control scheme: {uc.SchemeName}.");
			playersControlSchemes.Add(playerId, uc);
			unassignedPlayers.Remove(playerId);
			PlayerControlAssigned.Invoke(this, new Tuple<int, UniqueControl>(playerId, uc));
		}

		private void AssignShipControls(UniqueControl uc, Ship s, ShipProperties p)
		{
			p.shipInput = new ShipInputHandler(s.state,
				InputSystem.GetDeviceById(uc.DeviceId), uc.SchemeName);
		}
	}

}
public struct UniqueControl
{
	public string SchemeName;
	public int DeviceId;
	/// <summary>
	/// Struct to simply define a control scheme with the device it belongs to.
	/// </summary>
	/// <param name="sn">Name of the control scheme (See Action Maps)</param>
	/// <param name="di">Id of the device the control belongs to</param>
	public UniqueControl(string schemeName, int deviceId)
	{
		SchemeName = schemeName;
		DeviceId = deviceId;
	}
}

/// <summary>
/// Listens to all the events defined in the Player action map
/// (has multiple schemes across different devices)
/// and fires an event with information which device and control scheme
/// caused the event.
/// </summary>
public class ControlSchemeDetection : IPlayerActions
{
	InputActionMaps actionMaps;
	public event EventHandler<UniqueControl> ControlSchemeDetected;

	public ControlSchemeDetection()
	{
		actionMaps = new InputActionMaps();
		actionMaps.Player.SetCallbacks(this);
	}

	public void EnableDetection()
	{
		actionMaps.Player.Enable();
	}
	public void DisableDetection()
	{
		actionMaps.Player.Disable();
	}

	public void OnBoost(InputAction.CallbackContext context)
	{
		readControlScheme(context);
	}

	public void OnReset(InputAction.CallbackContext context)
	{
		readControlScheme(context);
	}

	public void OnSteer(InputAction.CallbackContext context)
	{
		readControlScheme(context);
	}

	public void OnThrust(InputAction.CallbackContext context)
	{
		readControlScheme(context);
	}

	public void readControlScheme(InputAction.CallbackContext context)
	{
		if (!context.canceled || context.performed)
		{
			return;
		}
		int bindingIndex = context.action.GetBindingIndexForControl(context.control);
		InputBinding binding = context.action.bindings[bindingIndex];
		string controlScheme = binding.groups.Split(';')[0];
		ControlSchemeDetected.Invoke(this, new UniqueControl(controlScheme,
			context.control.device.deviceId));
	}
}