using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DragonMovement : MonoBehaviour
{
    [SerializeField] KeyCode FlapKey;
    Rigidbody2D _rigidbody;
    float _flapTime = 0f;
    [SerializeField] float FlapForce = 300f;
    [SerializeField] float FlapLength = .25f;
    Animator _animator;
    bool _inCloud;
    [SerializeField] GameObject _fireballPrefab;
    [SerializeField] GameObject _fireballSpawnPoint;
    [SerializeField] GameObject _coneSpawnPoint;
    [SerializeField] GameObject _flash;
    [SerializeField] string _dragonName;
    [SerializeField] Color _color;
    [SerializeField] TrailRenderer _trail;

    float _stunTime = 0f;
    float _debugCurSpeed;

    bool _victory = false;

    public enum AttackType
    {
        FIREBALL,
        CONE
    }

    [SerializeField] AttackType _attackType = AttackType.FIREBALL;

    const string CONE_NAME = "cone";
    private void OnTriggerEnter2D(Collider2D collision)
    {

        GameObject cone = transform.Find(CONE_NAME)?.gameObject;
        if (cone)
        {
            GameObject.Destroy(cone);
        }

        CheckCloudCollision(collision);

        if (collision.CompareTag("FinishLine"))
        {
            Game game = FindObjectOfType<Game>();
            game.Victory(_dragonName, _color);
        }

        if (collision.CompareTag("Lightning"))
        {
            Stun(.4f);
        }

        if (collision.CompareTag("Fireball"))
        {
            Fireball fireball = collision.GetComponent<Fireball>();

            if (fireball.AttackType == AttackType.CONE)
            {
                Stun(.4f);
            }
            else
            {
                Stun(.6f);
            }
        }
    }

    private void OnTriggerStay2D(Collider2D collision)
    {
        CheckCloudCollision(collision);
    }

    private void CheckCloudCollision(Collider2D collision)
    {
        if (collision.CompareTag("Cloud"))
        {
            Cloud cloud = collision.GetComponent<Cloud>();
            cloud.TriggerLighting(transform.position.x);
        }
    }

    void Stun(float length)
    {
        _stunTime = length;
        _animator.Play("fall");
    }

    private void OnTriggerExit2D(Collider2D collision)
    {
        _inCloud = false;
    }
    void Start()
    {
        _rigidbody = this.GetComponent<Rigidbody2D>();
        _animator = this.GetComponent<Animator>();
        _trail.startColor = _color;
        _trail.endColor = _color;
    }

    private void Update()
    {
        if (Input.GetKeyDown(FlapKey) && _stunTime <0f)
        {
            Flap();
            Shoot();
        }

        if (_victory)
        {
            float scale = 8f * Time.deltaTime;
            transform.localScale = transform.localScale + new Vector3(scale, scale, 0f);
        }
    }

    void Flap()
    {
        _flapTime = FlapLength;
        _animator.Play("fly");
    }

    void Shoot()
    {
        if (_attackType == AttackType.FIREBALL)
        {
            GameObject.Instantiate(_fireballPrefab, _fireballSpawnPoint.transform.position, Quaternion.identity);
        }
        else if (_attackType == AttackType.CONE)
        {
            GameObject fireball = GameObject.Instantiate(_fireballPrefab, _coneSpawnPoint.transform.position, Quaternion.identity);
            fireball.name = CONE_NAME;
            fireball.GetComponent<Fireball>().AttackType = AttackType.CONE;
            fireball.transform.parent = this.transform;
        }
    }

    public void ClearTrail()
    {
        _trail.Clear();
    }

    void FixedUpdate()
    {
        if (_flapTime > 0f && _stunTime < 0f)
        {
            _rigidbody.AddForce(new Vector2(0f, FlapForce));
        }
        if (_stunTime > 0f)
        {
            _rigidbody.AddForce(new Vector2(FlapForce * -.05f, FlapForce * -.05f));
            transform.Rotate(Vector3.forward, Time.deltaTime * 1000f);
            if (_flapTime < 0f)
            {
                _flapTime = 0f;
            }
        }
        else
        {
            transform.rotation = Quaternion.identity;
        }
        _flapTime -= Time.deltaTime;
        _stunTime -= Time.deltaTime;

        const float SPEED = .6f;
        float horizontalSpeed = SPEED;
        float verticalSpeed = 0f;

        const float GLIDE_TIME = 0.6f;
        if (_flapTime < - GLIDE_TIME)
        {
            if (_trail.enabled == false)
            {
                _trail.Clear();
                _trail.enabled = true;
            }
            _animator.Play("speedup");
            horizontalSpeed += (_flapTime + GLIDE_TIME) * -2f;
        }
        else
        {
            _trail.enabled = false;
        }

        /* //old cloud behavior
        if (_inCloud)
        {
            if (_flapTime < 0)
                _flapTime = 0;

            if (_animator.GetCurrentAnimatorStateInfo(0).IsName("speedup"))
            {
                _animator.Play("glide");
            }

            horizontalSpeed = -3f;

            if (_rigidbody.velocity.y > 0)
                verticalSpeed = -2f;
            else if (_rigidbody.velocity.y < 0)
                verticalSpeed = 2f;
        }
        */

 
        if (_stunTime > 0f)
        {
            horizontalSpeed = -5f;
        }

        const float MAX_SPEED = SPEED * 2.2f;
        if (horizontalSpeed > MAX_SPEED)
        {
            horizontalSpeed = MAX_SPEED;
        }

        _debugCurSpeed = horizontalSpeed;
        float x = transform.position.x + horizontalSpeed;
        x = Mathf.Max(x, 32);
        transform.position = new Vector3(x, transform.position.y+ verticalSpeed, transform.position.z);

    }

    public void Flash()
    {
        _flash.SetActive(true);
        Invoke("Unflash", .2f);
    }

    public void Unflash()
    {
        _flash.SetActive(false);
    }
}