using System;
using UnityEngine;
using UnityEngine.Tilemaps;

public abstract class Character : MonoBehaviour
{
    [SerializeField]
    protected Animator _animator;
    [SerializeField]
    private float MovementSpeed = 1.5f;
    [SerializeField]
    protected GameObject _bonesSide;
    [SerializeField]
    protected GameObject _bonesBack;
    [SerializeField]
    protected GameObject _spawnPoint;
    [SerializeField]
    protected Tilemap _tileMap;

    [SerializeField]
    private LayerMask _mapLayer;



    private Rigidbody2D _body;
    private CapsuleCollider2D _capsuleCollider;
    protected bool _isOnBridge;
    protected bool _isOnLadder = false;
    protected bool _isFalling;
    protected bool _facingRight = true;


    protected bool isAllowVertical = true;
    protected bool isAllowRight = true;
    protected bool isAllowLeft = true;
    private Vector2 _cellSize;

    private void Start()
    {
        _body = GetComponent<Rigidbody2D>();
        _capsuleCollider = GetComponent<CapsuleCollider2D>();

        _cellSize = new Vector2(_tileMap.cellSize.x, _tileMap.cellSize.y);
    }

    protected void Spawn()
    {
        transform.position = _spawnPoint.transform.position;
    }

    protected void MoveTo(float inputHorizontal, float inputVertical)
    {
        var downBlock = GetMapElement(Vector2.down);

        if (downBlock == MapElementType.Water)
        {
            Death();
        }

        _isOnBridge = downBlock == MapElementType.Bridge && !_isFalling;
        GetMapElement(Vector2.up);
        if (downBlock == MapElementType.Wall || _isOnLadder || _isOnBridge || downBlock == MapElementType.BreakableWall)
        {
            var leftCheck = GetMapElement(Vector2.left);
            var rightCheck = GetMapElement(Vector2.right);

            //print($"LeftCheck:{leftCheck} right:{rightCheck}");

            isAllowLeft = !(leftCheck == MapElementType.Wall || leftCheck == MapElementType.BreakableWall);
            isAllowRight = !(rightCheck == MapElementType.Wall || rightCheck == MapElementType.BreakableWall);

            isAllowVertical = false;
            _isFalling = false;
            float h_movement = inputHorizontal;

            if (h_movement > 0 && !_facingRight || h_movement < 0 && _facingRight)
            {
                FlipCharacter();
            }

            SetWalkingAnimation(h_movement != 0);
            ;
            _isOnLadder = GetMapElement(Vector2.zero) == MapElementType.Ladder || downBlock == MapElementType.Ladder;

            if (_isOnLadder)
            {
                float v_movement = inputVertical;
                isAllowVertical = true;

                SetClimbingAnimation(v_movement != 0);
                _body.velocity = new Vector2(h_movement * MovementSpeed, v_movement * MovementSpeed);

            }
            else
            {
                _body.velocity = new Vector2(h_movement * MovementSpeed, _body.velocity.y);
            }
        }
        else
        {
            _isFalling = true;
        }


        if (_isOnLadder || _isOnBridge)
        {
            _body.gravityScale = 0;
        }
        else
        {
            _body.gravityScale = 1;
        }
        if (_isFalling)
        {
            _body.velocity = new Vector2(0, _body.velocity.y);
            SetWalkingAnimation(false);

            if (downBlock == MapElementType.Ladder)
            {
                _body.velocity = Vector2.zero;
                _isOnLadder = true;
            }
        }

    }

    private void Death()
    {
        OnDeath();

    }


    private MapElementType GetMapElement(Vector3 direction)
    {
        var bounds = _capsuleCollider.bounds.min;

        //var cell = _tileMap.WorldToCell(bounds + direction);
        //Vector2 cell2d = new Vector2(cell.x + 0.5f, cell.y + 0.3f);
        Vector2 cellSize = _cellSize;

        var playerBounds = _capsuleCollider.bounds.center;

        //DrawBounds(playerBounds, cellSize, Color.cyan);

        playerBounds = playerBounds + direction;

        var raycastHit = BoxCast(playerBounds, cellSize, 0f, Vector3.forward, .01f, _mapLayer);



        MapElementType returnValue;
        Color color = Color.red;
        if (raycastHit)
        {
            var mapElement = raycastHit.transform.GetComponent<MapElement>();
            if (!mapElement.IsEnabled)
            {
                color = Color.white;
                returnValue = MapElementType.Empty;
            }
            else
            {
                returnValue = mapElement.ElementSO.ElementType;

                switch (returnValue)
                {
                    case MapElementType.Wall:
                        color = Color.green;
                        break;
                    case MapElementType.Ladder:
                        color = Color.yellow;
                        break;
                    case MapElementType.BreakableWall:
                        color = Color.magenta;
                        break;
                }
            }
        }
        else
        {
            returnValue = MapElementType.Empty;
        }
        //  DrawBounds(playerBounds, cellSize, color);

        return returnValue;
    }

    //private static void DrawBounds(Vector2 cell2d, Vector2 cellSize, Color color)
    //{
    //    Debug.DrawLine(cell2d, cell2d + new Vector2(cellSize.x, 0), color);
    //    Debug.DrawLine(cell2d + new Vector2(cellSize.x, 0), cell2d + new Vector2(cellSize.x, cellSize.y), color);
    //    Debug.DrawLine(cell2d, cell2d + new Vector2(0, cellSize.y), color);
    //    Debug.DrawLine(cell2d + new Vector2(0, cellSize.y), cell2d + new Vector2(cellSize.x, cellSize.y), color);
    //}

    protected abstract void OnDeath();
    protected abstract void SetWalkingAnimation(bool isWalking);
    protected abstract void SetClimbingAnimation(bool isClimbing);



    private void FlipCharacter()
    {
        Vector3 currentScale = gameObject.transform.localScale;
        currentScale.x *= -1;
        gameObject.transform.localScale = currentScale;

        _facingRight = !_facingRight;
    }

    static public RaycastHit2D BoxCast(Vector2 origen, Vector2 size, float angle, Vector2 direction, float distance, int mask)
    {
        RaycastHit2D hit = Physics2D.BoxCast(origen, size, angle, direction, distance, mask);

        //Setting up the points to draw the cast
        Vector2 p1, p2, p3, p4, p5, p6, p7, p8;
        float w = size.x * 0.5f;
        float h = size.y * 0.5f;
        p1 = new Vector2(-w, h);
        p2 = new Vector2(w, h);
        p3 = new Vector2(w, -h);
        p4 = new Vector2(-w, -h);

        Quaternion q = Quaternion.AngleAxis(angle, new Vector3(0, 0, 1));
        p1 = q * p1;
        p2 = q * p2;
        p3 = q * p3;
        p4 = q * p4;

        p1 += origen;
        p2 += origen;
        p3 += origen;
        p4 += origen;

        Vector2 realDistance = direction.normalized * distance;
        p5 = p1 + realDistance;
        p6 = p2 + realDistance;
        p7 = p3 + realDistance;
        p8 = p4 + realDistance;


        //Drawing the cast
        Color castColor = hit ? Color.red : Color.green;
        Debug.DrawLine(p1, p2, castColor);
        Debug.DrawLine(p2, p3, castColor);
        Debug.DrawLine(p3, p4, castColor);
        Debug.DrawLine(p4, p1, castColor);

        Debug.DrawLine(p5, p6, castColor);
        Debug.DrawLine(p6, p7, castColor);
        Debug.DrawLine(p7, p8, castColor);
        Debug.DrawLine(p8, p5, castColor);

        Debug.DrawLine(p1, p5, Color.grey);
        Debug.DrawLine(p2, p6, Color.grey);
        Debug.DrawLine(p3, p7, Color.grey);
        Debug.DrawLine(p4, p8, Color.grey);
        if (hit)
        {
            Debug.DrawLine(hit.point, hit.point + hit.normal.normalized * 0.2f, Color.yellow);
        }

        return hit;
    }
}