using UnityEngine;
using UnityEngine.EventSystems;

public class ShootController : MonoBehaviour
{
    private LevelController levelController;
    public float bulletMass = 1;
    private LineDrawer lineDrawer;
    private Vector2 shootDir = new Vector2();
    public Transform gun;
    public Transform rayStart;
    public bool isFlip = false;
    private bool wasDown = false;
    private void Awake()
    {
        levelController = FindObjectOfType<LevelController>();
    }

    private void Start()
    {
        lineDrawer = new LineDrawer(0.05f);
    }

    void Update()
    {
        var fingerId = PointerInputModule.kMouseLeftId;
        if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
        {
            fingerId = Input.GetTouch(0).fingerId;
        }

        if (levelController.canShoot())
        {
            if (EventSystem.current.IsPointerOverGameObject(fingerId))
                return;

            if (Input.GetMouseButtonDown(0))
            {
                lineDrawer.enable(true);
                wasDown = true;
            }

            if (wasDown)
            {
                if (Input.GetMouseButton(0))
                    updateAim(Input.mousePosition);

                if (Input.GetMouseButtonUp(0))
                {
                    GoFabric.createBullet(rayStart.position, shootDir, bulletMass);
                    AudioController.Instance.PlaySound(Sounds.Shot);
                    EventManager.TriggerEvent(new Events.ShotEvent(shootDir.x));
                    wasDown = false;
                }
            }
        }

        if (Input.GetMouseButtonUp(0))
        {
            lineDrawer.enable(false);
        }
    }

    private void updateAim(Vector2 touchPos)
    {
        var mouseWorldPosition = Camera.main.ScreenToWorldPoint(touchPos);
        var pos = rayStart.position;
        var gunDirection = new Vector2(
            mouseWorldPosition.x - gun.position.x,
            mouseWorldPosition.y - gun.position.y
            );
        gun.right = gunDirection;
        shootDir = gunDirection;
        lineDrawer.DrawLineInGameView(pos, pos + (Vector3) (gunDirection * 200), new Color(1, 0, 0, 0.5f));
         gunDirection = new Vector2(
            mouseWorldPosition.x - transform.position.x,
            mouseWorldPosition.y - transform.position.y
        );

        FlipHero(gunDirection);
    }


    private void FlipHero(Vector2 dir)
    {
        var angle = dir.Angle();
        var flip = angle >= 90 && angle <= 270;
        gun.transform.localScale = new Vector3(flip ? -1 : 1, flip ? -1 : 1, 1);
        transform.localScale = new Vector3(flip ? 1 : -1, 1, 1);
    }
    bool IsPointerOverGameObject( int fingerId )
    {
        EventSystem eventSystem = EventSystem.current;
        return ( eventSystem.IsPointerOverGameObject( fingerId )
                 && eventSystem.currentSelectedGameObject != null );
    }
}