using System.Collections;
using UnityEngine;
public class ChipFallingState : IState
{
    const float ROTATION_SPEED_FACTOR = -0.5f;
    const float BOUNCE_SPEEDY_LOSS_FACTOR = 0.5f;
    const float BOUNCE_SPEEDY_TRESHOLD = 5;

    const float MAX_ANGULAR_SPEED = 500;
    bool USE_BOUNCE = false;

    int rowIndex;
    int colIndex;
    float angularSpeed;
    Vector2 targetPosition;

    Transform chipTransform;

    bool firstTouchCompleted = false;

    float startDelay = 0;
    bool delayCompleted = false;


    public ChipFallingState(float startDelay)
    {
        this.startDelay = startDelay;
    }

    #region ENTER_METHODS
    public void enter() => GameManager.instance.StartCoroutine(DelayedEnter(startDelay));
    private void CacheFields()
    {
        chipTransform = GameManager.instance.currentChip.transform;
        colIndex = GameManager.instance.currentColumnIndex;
        rowIndex = GameManager.fieldModel.getHeight(colIndex);
        targetPosition = CalculateTargetPosition();
        angularSpeed = Random.Range(-MAX_ANGULAR_SPEED, MAX_ANGULAR_SPEED);
    }
    private void PrepareForFalling()
    {
        chipTransform.GetComponent<TrailRenderer>().enabled = true;
        GameManager.instance.chipYSpeed = 0;
    }
    private void InitialSound() => SoundManager.instance.playDropDown();

    private Vector2 CalculateTargetPosition()
    {
        float targetX = chipTransform.position.x;
        float targetY = GameManager.instance.slotLeftTop.transform.position.y - GameManager.instance.stepY * rowIndex;

        return new Vector2(targetX, targetY);
    }
    #endregion

    #region UPDATE_METHODS
    public void update()
    {
        if (!delayCompleted) return;

        ChipFallProcess();

        if (chipTransform.position.y == targetPosition.y)
        {

            //обработка первого касания
            if (!firstTouchCompleted)
            {
                firstTouchCompleted = true;

                chipTransform.GetComponent<TrailRenderer>().emitting = false;

                //Можно попробовать некоторый звук подходящий в это место
                //SoundManager.instance.playExplosion();


            }



            if (USE_BOUNCE)
                BounceBehaviour();
            else
                NoBounceBehaviour();
        }
    }
    private void ChipFallProcess()
    {
        GameManager.instance.chipYSpeed += GameManager.instance.chipAcceleration * Time.deltaTime;

        float speed = GameManager.instance.chipYSpeed;
        float offsetY = speed * Time.deltaTime;
        if (chipTransform.position.y - offsetY < targetPosition.y)
            offsetY = -targetPosition.y + chipTransform.position.y;

        chipTransform.transform.Translate(Vector2.down * offsetY, Space.World);
        chipTransform.transform.Rotate(0, 0, angularSpeed * Time.deltaTime);
    }
    private void BounceBehaviour()
    {
        if (GameManager.instance.chipYSpeed > BOUNCE_SPEEDY_TRESHOLD)
        {
            Bounce();
        }
        else
        {
            CompleteChipLanding();
        }
    }
    private void NoBounceBehaviour()
    {
        SoundManager.instance.playChipBounce();
        CompleteChipLanding();
    }

    private void Bounce()
    {
        angularSpeed *= ROTATION_SPEED_FACTOR;
        SoundManager.instance.playChipBounce();
        GameManager.instance.chipYSpeed = -GameManager.instance.chipYSpeed * BOUNCE_SPEEDY_LOSS_FACTOR;
    }

    private void CompleteChipLanding()
    {
        chipTransform.position = targetPosition;
        GameManager.fieldModel.FieldArray[rowIndex, colIndex] = GameManager.instance.currentPlayer;
        GameManager.instance.setChipTransformToArray(rowIndex, colIndex, chipTransform);
        //GameManager.instance.stateMachine.ChangeState(new CheckState());
        //EndOfTurnHandler.EvaluateTurnEnding();
        StateRouter.RouteAfterTurn();
    }
    #endregion

    #region EXIT_METHODS
    public void exit() => AnnouncePlayerTurn();
    private void AnnouncePlayerTurn()
    {
        if (GameManager.instance.currentPlayer == CellState.Player1)
        {
            CharacterEventBus.Instance.OnPlayerTurn?.Invoke();
        }
    }
    #endregion


    IEnumerator DelayedEnter(float startDelay)
    {
        yield return new WaitForSeconds(startDelay);

        CacheFields();
        PrepareForFalling();
        InitialSound();

        delayCompleted = true;
    }
}