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

[RequireComponent(typeof(MovementBehaviour))]
public class InteractionBehaviour : MonoBehaviour, IObjectParentHolder {
    // Start is called before the first frame update
    private MovementBehaviour _movementBehaviour;

    [SerializeField] private float _interactionDistance = 2.0f;

    [SerializeField] private LayerMask _interactionLayer;

    private EmptyCounter _lastInteractedObject = null;

    public event EventHandler<OnSelectedCounterArgs> OnSelectedCounter;
    
    [SerializeField] private Transform _holdItemTransform;
    private Object _heldObject;

    public class OnSelectedCounterArgs : EventArgs {
        public EmptyCounter selectedCounter;
    }

    void Start() {
    }

    void Awake() {
        _movementBehaviour = GetComponent<MovementBehaviour>();
    }

    // Update is called once per frame
    void Update() {
    }

    public void HandleInteraction() {
        Vector2 inputVector = _movementBehaviour.desiredMovementDirection.normalized;
        Vector3 moveDirection = new Vector3(inputVector.x, 0, inputVector.y);
        Vector3 origin = transform.position;
        origin.y += 0.5f; //slight offset so we dont go under the counters
        RaycastHit hit;
        Debug.DrawRay(origin, transform.forward * _interactionDistance, Color.red);
        if (Physics.Raycast(origin, transform.forward, out hit, _interactionDistance, _interactionLayer)) {
            if (hit.transform.TryGetComponent(out EmptyCounter emptyCounter)) {
                if (_lastInteractedObject != hit.transform.gameObject) {
                    SetSelectedCounter(emptyCounter);
                }
            }
            else {
                SetSelectedCounter(null);
            }
        }
        else {
            SetSelectedCounter(null);
        }
    }


    public void Interact() {
        if (_lastInteractedObject == null) return;
        if (_lastInteractedObject.TryGetComponent(out EmptyCounter emptyCounter)) {
            emptyCounter.Interact();
        }
    }

    private void SetSelectedCounter(EmptyCounter selectedCounter) {
        _lastInteractedObject = selectedCounter;
        OnSelectedCounter?.Invoke(this, new OnSelectedCounterArgs { selectedCounter = _lastInteractedObject });
    }

    public Transform GetHolderTransform() {
        return _holdItemTransform;
    }

    public void SetObject(Object obj) {
        _heldObject = obj;
    }

    public Object GetObject() {
        return _heldObject;
    }

    public void ClearObject() {
        _heldObject = null;
    }

    public bool HasObject() {
        return _heldObject != null;
    }
}