using System;
using System.Collections;
using System.Collections.Generic;
using Animancer;
using BITFALL.Player.Movement;
using BITKit;
using BITKit.Entities;
using BITKit.StateMachine;
using UnityEngine;
using UnityEngine.Animations.Rigging;
using Cysharp.Threading.Tasks;

// ReSharper disable UnassignedField.Global

namespace BITFALL.Player.Animation.States
{
	public abstract class PlayerAnimateStates : IPlayerAnimationState
	{
		public virtual bool Enabled { get; set; }
		protected IPlayerAnimationState entryState;
		[Inject] public PlayerAnimationController self;
		
		public virtual void Initialize()
		{
			
		}

		public virtual void OnStateEntry(IState old)
		{
			entryState = old as IPlayerAnimationState;
		}

		public virtual void OnStateUpdate(float deltaTime)
		{
		}

		public virtual void OnStateExit(IState old, IState newState)
		{
		}

		public virtual void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
		}
		protected void Exit()
		{
			if (Enabled is false) return;
			switch (self._movement.CurrentState)
			{
				case IPlayerSprintState:
					self.TransitionState<Sprint>();
					return;
				case IPlayerRunState:
					self.TransitionState<Run>();
					return;
				case IPlayerWalkState:
					self.TransitionState<Walk>();
					return;
				case IPlayerCrouchState:
					self.TransitionState<Crouch>();
					return;
			}
			switch (entryState)
			{
				case IPlayerSprintState:
					self.TransitionState<Sprint>();
					return;
				case IPlayerRunState:
					self.TransitionState<Run>();
					return;
				case IPlayerWalkState:
					self.TransitionState<Walk>();
					return;
				case IPlayerCrouchState:
					self.TransitionState<Crouch>();
					return;
				default:
					self.TransitionState<Walk>();
					return;
			}
		}
	}
	[Serializable]
	public class Walk : PlayerAnimateStates,IPlayerWalkState
	{
		[SerializeField] private MixerTransition2D mixer;
		[SerializeField] private AnimationClip clip;
		private MixerState<Vector2> state;
		[Inject] private IHealth _health;
		// public override void OnStateEntry(IState old)
		// {
		// 	base.OnStateEntry(old);
		// 	state = self.AnimancerComponent.Play(mixer).As<MixerState<Vector2>>();
		// 	var v = self._movement.LocomotionBasedVelocity;
		// 	state.Parameter = new Vector2(v.x, v.z);
		// }
		public override void OnStateUpdate(float deltaTime)
		{
			base.OnStateUpdate(deltaTime);
			if (_health.IsAlive is false) return;
			var v = self._movement.LocomotionBasedVelocity;
			if (v.magnitude <= 0.1f)
			{
				self.AnimancerComponent.Play(clip, 0.2f);
			}
			else
			{
				state = self.AnimancerComponent.Play(mixer).As<MixerState<Vector2>>();
				state.Parameter = Vector2.Lerp(
					state.Parameter,new Vector2(v.x, v.z),5*deltaTime
				) ;
			}
		}

		public override void OnStateExit(IState old, IState newState)
		{
			base.OnStateExit(old, newState);
			//aimRig.weight = 0;
		}

		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if (Enabled is false) return;
			switch (newState)
			{
				case IPlayerRunState:
					self.TransitionState<Run>();
					return;
				case IPlayerCrouchState:
					self.TransitionState<Crouch>();
					return;
				case IPlayerSprintState:
					self.TransitionState<Sprint>();
					return;
			}
		}
	}
	[Serializable]
	public class Run : PlayerAnimateStates,IPlayerRunState
	{
		[SerializeField] private AnimationClip clip;
		public override void OnStateEntry(IState old)
		{
			base.OnStateEntry(old);
			self.AnimancerComponent.Play(clip);
		}
		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if(Enabled &&newState is not IPlayerRunState)Exit();
		}
	}
	[Serializable]
	public class Sprint : PlayerAnimateStates,IPlayerSprintState
	{
		[SerializeField] private AnimationClip clip;
		public override void OnStateEntry(IState old)
		{
			//self.animator.Play(BITConstant.Player.Sprint);
			self.AnimancerComponent.Play(clip);
		}
		public override void OnStateUpdate(float deltaTime)
		{
			base.OnStateUpdate(deltaTime);
			if(self._movement.CurrentState is not IPlayerSprintState)
				Exit();
		}
		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			//if(Enabled &&newState is not IPlayerSprintState)Exit();
			// if (Enabled is false) return;
			// switch (newState)
			// {
			// 	case IPlayerWalkState:
			// 		self.TransitionState<Walk>();
			// 		break;
			// 	case IPlayerCrouchState:
			// 		self.TransitionState<Crouch>();
			// 		break;
			// }
		}
	}
	[Serializable]
	public class Crouch : PlayerAnimateStates,IPlayerCrouchState
	{
		[SerializeField] private MixerTransition2D mixer;
		[SerializeField] private AnimationClip clip;
		private MixerState<Vector2> state;
		public override void OnStateUpdate(float deltaTime)
		{
			base.OnStateUpdate(deltaTime);

			if (self._movement.Velocity.magnitude > 0.1f)
			{
				var v = self._movement.LocomotionBasedVelocity;
				state = self.AnimancerComponent.Play(mixer,0.2f).As<MixerState<Vector2>>();
				state.Parameter = Vector2.Lerp(
					state.Parameter, new Vector2(v.x, v.z), 5 * deltaTime
				);
			}
			else
			{
				self.AnimancerComponent.Play(clip,0.2f);
			}
			
		}
		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if (Enabled is false) return;
			if(newState is not IPlayerCrouchState)
				self.TransitionState<Walk>();
		}
	}

	[Serializable]
	public class Parachute : PlayerAnimateStates
	{
		[SerializeField] private AnimationClip clip;
		[SerializeField] private AnimationClip exitClip;
		[SerializeField] private MixerTransition2D _linearMixerTransition;
		private MixerState<Vector2> state;

		[Inject] private IEntityOverride _entityOverride;
		public override async void OnStateEntry(IState old)
		{
			//_entityOverride.AddOverride(this);
			await self.AnimancerComponent.Play(clip);
			if (!Enabled) return;
			//entityOverride.RemoveOverride(this);
			state = self.AnimancerComponent.Play(_linearMixerTransition).As<MixerState<Vector2>>();			
		}

		public override async void OnStateExit(IState old, IState newState)
		{
			base.OnStateExit(old, newState);
			state = null;
			if (self._movement.CurrentState is IPlayerWalkState && self._movement.IsGrounded)
			{
				_entityOverride.AddOverride(this);
				var x = self.AnimancerComponent.Layers[1].Play(exitClip, 0.1f);
				await x;
				x.Stop();
			}

			_entityOverride.RemoveOverride(this);
		}

		public override void OnStateUpdate(float deltaTime)
		{
			base.OnStateUpdate(deltaTime);
			if (state is not null)
			{
				var velocity = self._movement.LocomotionBasedVelocity;
				state.Parameter = new Vector2(velocity.x,velocity.z);
			}
		}

		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if(newState is IPlayerParachuteState)
				self.TransitionState<Parachute>();
			else if(Enabled && newState is not IPlayerKnockdownState)
			{
				self.TransitionState<Walk>();
			}
		}
	}
	[Serializable]
	public class Slide : PlayerAnimateStates
	{
		[SerializeField] private AnimationClip clip;
		public override void OnStateEntry(IState old)
		{
			//self.animator.Play(BITConstant.Player.Slide);
			self.AnimancerComponent.Play(clip);
		}
		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if(newState is IPlayerSlideState)
				self.TransitionState<Slide>();
			else if(Enabled && newState is not IPlayerKnockdownState)
			{
				Exit();
			}
		}
	}

	[Serializable]
	public class Knockdown : PlayerAnimateStates
	{
		[SerializeField] private AnimationClip entryClip;
		[SerializeField] private AnimationClip clip;
		[SerializeField] private MixerTransition2D mixer;
		private MixerState<Vector2> state;
		[Inject] private IEntityOverride _entityOverride;
		[Inject] private IPlayerMovement _playerMovement;
		public override void Initialize()
		{
			base.Initialize();
			//_initialController = self.animator.animator.runtimeAnimatorController;
		}
		public override async void OnStateEntry(IState old)
		{
			_entityOverride.AddOverride(this);
			await self.AnimancerComponent.Play(entryClip,0.1f);
			_entityOverride.RemoveOverride(this);
		}

		public override void OnStateUpdate(float deltaTime)
		{
			base.OnStateUpdate(deltaTime);
			if (_entityOverride.IsOvering) return;
			if (((Vector2)_playerMovement.InputVector).magnitude > 0)
			{
				state = self.AnimancerComponent.Play(mixer,0.2f).As<MixerState<Vector2>>();
				state.Parameter = Vector2.Lerp(
					state.Parameter,
					_playerMovement.InputVector,
					3 * deltaTime
				);
			}
			else
			{
				self.AnimancerComponent.Play(clip,0.2f);
			}
		}
		public override void OnStateExit(IState old, IState newState)
		{
			_entityOverride.RemoveOverride(this);
		}
		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if (newState is IPlayerKnockdownState)
			{
				self.TransitionState<Knockdown>();
			}
			else if(Enabled)
			{
				self.TransitionState<Walk>();
			}
		}
	}
	[Serializable]
	public class Link : PlayerAnimateStates,IPlayerLinkState
	{
		public int LinkArea { get; set; }
		[SerializeField] private AnimationClip entryClip;
		[SerializeField] private LinearMixerTransition mixer;
		private MixerState<float> state;
		[Inject] private IPlayerMovement _playerMovement;
		public override async void OnStateEntry(IState old)
		{
			switch (LinkArea)
			{
				case 5:
					await self.AnimancerComponent.Play(entryClip);
					if (!Enabled) return;
					state = self.AnimancerComponent.Play(mixer).As<MixerState<float>>();
					break;
			}
		}
		public override void OnStateExit(IState old, IState newState)
		{
			base.OnStateExit(old, newState);
			state = null;
		}
		public override void OnStateUpdate(float deltaTime)
		{
			base.OnStateUpdate(deltaTime);
			if (state is not null)
			{
					state.Parameter = Mathf.Lerp(state.Parameter, _playerMovement.InputVector.y, 5 * deltaTime);
			}
		}

		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			if (Enabled)
			{
				switch (newState)
				{
					case IPlayerWalkState:
						self.TransitionState<Walk>();
						break;
					case IPlayerCrouchState:
						self.TransitionState<Crouch>();
						break;
					case IPlayerSprintState:
						self.TransitionState<Sprint>();
						break;
				}
			}
			else
			{
				if (newState is IPlayerLinkState linkState)
				{
					LinkArea = linkState.LinkArea;
					self.TransitionState<Link>();
				}
			}
		}
	}

	[Serializable]
	public sealed class Fixed : PlayerAnimateStates
	{
		public override void OnStateEntry(IState old)
		{
		}
		public override void OnMovementStateChanged(IEntityMovementState oldState, IEntityMovementState newState)
		{
			base.OnMovementStateChanged(oldState, newState);
			if(newState is IPlayerFixedState)
				self.TransitionState<Fixed>();
			else if(Enabled)
				Exit();
		}
	}
}