using System.Threading;
using UdonSharp;
using UnityEngine;
using VRC.Core;
using VRC.SDK3.ClientSim;
using VRC.SDKBase;
using VRC.Udon;


public enum ChickenState
{
	Idle,
	Walk,
	Run,
	Eat,
	Held
}


public class Chimken : UdonSharpBehaviour
{
	[UdonSynced, FieldChangeCallback(nameof(AnimationState))]	private ChickenState _AnimationState = 0;
	[UdonSynced] private bool _IsBeingHeld = false;

	[SerializeField] private string _FollowUser = "";
	private VRCPlayerApi _PlayerToFollow = null;
	[FieldChangeCallback(nameof(FollowMode))] private bool _FollowMode = false;

	private Animator _Animator = null;
	private bool _Moving = false;
	private float _MovementTimer = 0.0f;
	private float _MovementDirectionDegrees = 0.0f;

	private const float WALK_SPEED = 0.35f;
	private const float RUN_SPEED = 1.4f;


	void Start()
	{
		_Animator = GetComponent<Animator>();
	}

	void FixedUpdate()
	{
		if (Networking.IsOwner(Networking.LocalPlayer, gameObject) && !_IsBeingHeld)
		{
			if (FollowMode && _PlayerToFollow != null)
			{
				Vector3 PlayerPosition = _PlayerToFollow.GetPosition();
				Vector3 PlayerPositionLateral = new Vector3(PlayerPosition.x, 0.0f, PlayerPosition.z);
				Vector3 ChickenPosition = transform.position;
				Vector3 ChickenPositionLateral = new Vector3(ChickenPosition.x, 0.0f, ChickenPosition.z);

				float DistanceToPlayer = Vector3.Distance(ChickenPositionLateral, PlayerPositionLateral);
				if (DistanceToPlayer <= 0.7f)
				{
					SetAnimationState(ChickenState.Eat);
				}
				else if (DistanceToPlayer <= 2.75f)
				{
					transform.LookAt(PlayerPosition);
					SetAnimationState(ChickenState.Walk);
				}
				else
				{
					transform.LookAt(PlayerPosition);
					SetAnimationState(ChickenState.Run);
				}
			}
			else
			{
				_MovementTimer -= Time.deltaTime;
				if (_MovementTimer <= 0.0f)
				{
					ChickenState NewState = (ChickenState)Random.Range(0, 4);
					SetAnimationState(NewState);
					_MovementDirectionDegrees = Random.Range(0.0f, 359.999999999f);

					switch (NewState)
					{
						case ChickenState.Idle:
							_MovementTimer = 4.0f;
							break;
						case ChickenState.Walk:
							_MovementTimer = 4.5f;
							break;
						case ChickenState.Run:
							_MovementTimer = 1.2f;
							break;
						case ChickenState.Eat:
							_MovementTimer = 6.0f;
							break;
					}
				}

				transform.rotation = Quaternion.Euler(
					transform.eulerAngles.x,
					Mathf.LerpAngle(transform.rotation.eulerAngles.y, _MovementDirectionDegrees, 0.2f),
					transform.eulerAngles.x);
			}

			if (_Moving)
			{
				switch (_AnimationState)
				{
					case ChickenState.Walk:
						transform.position += (transform.forward * Time.fixedDeltaTime * WALK_SPEED);
						break;
					case ChickenState.Run:
						transform.position += (transform.forward * Time.fixedDeltaTime * RUN_SPEED);
						break;
				}
			}

			// Reset roll and pitch to zero on every physics update so the chicken stays upright
			Vector3 Rotation = transform.eulerAngles;
			Rotation.x = 0.0f;
			Rotation.z = 0.0f;
			transform.rotation = Quaternion.Euler(Rotation);
		}
	}

	public override void OnPlayerJoined(VRCPlayerApi Player)
	{
		if (Player.displayName == _FollowUser)
		{
			_PlayerToFollow = Player;
			SetWanderMode();
		}

		base.OnPlayerJoined(Player);
	}

	public override void OnPlayerLeft(VRCPlayerApi Player)
	{
		if (Player.displayName == _FollowUser)
		{
			_PlayerToFollow = null;
			SetWanderMode();
		}

		base.OnPlayerLeft(Player);
	}

	public override void OnPickup()
	{
		Networking.SetOwner(Networking.LocalPlayer, gameObject);
		SetAnimationState(ChickenState.Held);
		_IsBeingHeld = true;

		base.OnPickup();
	}

	public override void OnDrop()
	{
		SetWanderMode();
		_IsBeingHeld = false;

		base.OnDrop();
	}

	public void OnCollisionEnter(Collision Collision)
	{
		Debug.LogError("[Chimken] Touch!!!");
	}


	private void SetWanderMode()
	{
		if (_PlayerToFollow == null)
		{
			FollowMode = false;
		}
		else
		{
			FollowMode = true;
		}
	}


	private void SetAnimationState(ChickenState State)
	{
		AnimationState = State;
		RequestSerialization();
	}

	private void OnStateChanged()
	{
		_Animator.SetInteger("State", (int)AnimationState);
		_Moving = false;

		switch (AnimationState)
		{
			case ChickenState.Idle:
				break;
			case ChickenState.Walk:
				_Moving = true;
				break;
			case ChickenState.Run:
				_Moving = true;
				break;
			case ChickenState.Eat:
				break;
			case ChickenState.Held:
				break;
		}
	}


	private ChickenState AnimationState
	{
		set
		{
			_AnimationState = value;
			OnStateChanged();
		}

		get => _AnimationState;
	}

	private bool FollowMode
	{
		set
		{
			_FollowMode = value;
		}

		get => _FollowMode;
	}
}