using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.SceneManagement;
using Quaternion = UnityEngine.Quaternion;
using Vector2 = UnityEngine.Vector2;

public class PlayerMovement : MonoBehaviour
{
    private Rigidbody2D _rigidbody2D;
    private Collider2D _collider2D;
    private Animator _animator;
    
    [Header("속도 설정")]
    [SerializeField] private float moveSpeed = 5f;
    [SerializeField] private float jumpForce = 10f;
    [SerializeField] private float poleForce = 3f;
    
    [Header("감지 설정")]
    [SerializeField] private Vector2 groundCheckSize = new Vector2(0.5f, 0.2f);
    [SerializeField] private Vector2 groundCheckOffset = new Vector2(0f, -0.6f);
    
    [SerializeField] private Vector2 hangCheckSize = new Vector2(0.3f, 0.5f);
    [SerializeField] private Vector2 hangCheckOffset = new Vector2(0.4f, 0.5f);
    
    [SerializeField] private LayerMask groundLayer;
    [SerializeField] private LayerMask hangingWallLayer;

    [SerializeField] private Collider2D hangingWallCollider;
    [SerializeField] private Rigidbody2D hangingWallRigidBody;
    
    [Header("사운드 설정")]
    [SerializeField] private float footstepRate = 0.3f;
    
    [Header("애니메이션 설정")]
    [SerializeField] private float sleepClipTransTime = 5f;
    [SerializeField] private float sleepEmojiSpawnRate = 3f;
    [SerializeField] private GameObject sleepEmojiPrefab;

    private float idleTimer = 0f;
    private Vector2 inputVector;
    private bool isHanging = false;
    private float footstepTimer;
    private bool isPlayer;

    public bool IsGroundedState => IsGrounded();
    public bool IsMoving => inputVector.x != 0;
    
    private void Awake()
    {
        _rigidbody2D = GetComponent<Rigidbody2D>();
        _collider2D = GetComponent<BoxCollider2D>();
        _animator = GetComponent<Animator>();
        isPlayer = gameObject.CompareTag("Player");
    }

    private void FixedUpdate()
    {
        if (GameManager.instance.gameState != GameState.Playing)
        {

            _rigidbody2D.linearVelocity = new Vector2(0, _rigidbody2D.linearVelocity.y);
            return;
        }
        
        bool isGrounded = IsGrounded();
        float yVelocity = _rigidbody2D.linearVelocity.y;
        
        _animator.SetBool("isGround", isGrounded);
        _animator.SetFloat("yVelocity", yVelocity);

        if (isGrounded)
        {
           if (inputVector.x != 0)
           {
               _animator.SetBool("isRun", true);
               _animator.SetBool("isSleeping", false);
               idleTimer = 0f;
           }
           else if(!_animator.GetBool("isLookDown") || !_animator.GetBool("isLookUp"))
           {
               _animator.SetBool("isRun", false);
               idleTimer += Time.fixedDeltaTime;
               if (idleTimer >= sleepClipTransTime)
               {
                   _animator.SetBool("isSleeping", true);
                   if ((idleTimer - sleepClipTransTime) > sleepEmojiSpawnRate)
                   {
                       Instantiate(sleepEmojiPrefab, transform.position + (transform.up * 0.1f) + (transform.right * 0.6f), Quaternion.identity);
                       idleTimer -= sleepEmojiSpawnRate;
                   }
               }
           }
        }
        else
        {
            _animator.SetBool("isRun", false);
            _animator.SetBool("isSleeping", false);
            idleTimer = 0f;
        }
        
        if (isPlayer)
        {
            if (inputVector.x != 0 && isGrounded)
            {
                footstepTimer += Time.fixedDeltaTime;
                if (footstepTimer >= footstepRate)
                {
                    SoundManager.instance.PlaySFX(SfxType.Walk);
                    footstepTimer = 0f;
                }
            }
            else
            {
                footstepTimer = footstepRate; 
            }
        }
        
        // 메달릴때 이동
        if (isHanging)
        {
            if (inputVector.x != 0)
            {
                hangingWallRigidBody.AddForce(Vector2.right * inputVector.x * poleForce);
            }
            return;
        }
        
        HandleRotation();
        
        // 이동 로직
        _rigidbody2D.linearVelocity = new Vector2(inputVector.x * moveSpeed, _rigidbody2D.linearVelocity.y);
    }

    public void SetLookAnimation(string paramName, bool value)
    {
        if (IsMoving || !IsGroundedState)
        {
            _animator.SetBool("isLookDown", false);
            _animator.SetBool("isLookUp", false);
            return;
        }

        if (value)
        {
            if (paramName == "isLookDown")
            {
                _animator.SetBool("isLookUp", false);
                idleTimer = 0f;
            }

            if (paramName == "isLookUp")
            {
                _animator.SetBool("isLookDown", false);
                idleTimer = 0f;
            }
        }

        _animator.SetBool(paramName, value);
    }
    
    public void SetMoveInput(Vector2 input)
    {
        inputVector = input;
    }

    public void TryJump()
    {
        if (GameManager.instance.gameState != GameState.Playing) return;

        // 매달린 상태에선 취소하기
        if (isHanging)
        {
            CancelHanging();
            if (isPlayer) SoundManager.instance.PlaySFX(SfxType.Jump);    
        }
        // 땅이라면 점프하기
        else if (IsGrounded())
        {
            if (isPlayer) SoundManager.instance.PlaySFX(SfxType.Jump);    
            _rigidbody2D.linearVelocity = new Vector2(_rigidbody2D.linearVelocity.x, jumpForce);
        }
    }

    public void TryHang()
    {
        if (GameManager.instance.gameState != GameState.Playing) return;
        
        if (isHanging) CancelHanging();
        else 
        {
            Vector2 checkPos = transform.TransformPoint(hangCheckOffset);
            Collider2D hit = Physics2D.OverlapBox(checkPos, hangCheckSize, 0, hangingWallLayer);
            if (hit != null) HangingObject();
        }
    }

    private void CancelHanging()
    {
        isHanging = false;
        _rigidbody2D.bodyType = RigidbodyType2D.Dynamic;
        if (hangingWallCollider != null)
        {
            Physics2D.IgnoreCollision(_collider2D, hangingWallCollider, false);
            hangingWallCollider = null;
        }
        transform.SetParent(null, true);
        if (hangingWallRigidBody != null)
        {
            _rigidbody2D.linearVelocity = hangingWallRigidBody.linearVelocity * 4;
            hangingWallRigidBody = null;
        }
    }

    private void HangingObject()
    {
        float direction = transform.rotation.eulerAngles.y == 180 ? -1f : 1f;
        RaycastHit2D hit = Physics2D.Raycast(transform.position, Vector2.right * direction, 1f, hangingWallLayer);

        if (hit.collider != null)
        {
            isHanging = true;
            _rigidbody2D.linearVelocity = Vector2.zero;
            _rigidbody2D.bodyType = RigidbodyType2D.Kinematic;
            
            hangingWallCollider = hit.collider;
            hangingWallRigidBody = hit.collider.attachedRigidbody;
            Physics2D.IgnoreCollision(_collider2D, hangingWallCollider, true);

            transform.position = new Vector2(hit.point.x, transform.position.y);
            gameObject.transform.SetParent(hit.transform, true);
            transform.localRotation = Quaternion.identity;
        }
    }
    
    private bool IsGrounded()
    {
        Vector2 checkPos = (Vector2)transform.position + groundCheckOffset;
        return Physics2D.OverlapBox(checkPos, groundCheckSize, 0f, groundLayer);
    }

    private void HandleRotation()
    {
        if (inputVector.x > 0) transform.rotation = Quaternion.Euler(0, 0, 0);
        else if (inputVector.x < 0) transform.rotation = Quaternion.Euler(0, 180, 0);
    }

    private void OnDrawGizmosSelected()
    {
        Gizmos.color = Color.green;
        Gizmos.DrawWireCube((Vector2)transform.position + groundCheckOffset, groundCheckSize);
        Gizmos.color = Color.cyan;
        Vector2 hangPos = transform.TransformPoint(hangCheckOffset);
        Gizmos.DrawWireCube(hangPos, hangCheckSize);
    }
}