using UnityEngine;
using System.Collections;
using System;

public class PlayerInteraction : MonoBehaviour
{


    public float speed = 10;
    public bool canHold = true;
    public Transform guide;
    [SerializeField] LayerMask interactionLayers = ~0;

    private GameObject pickUpAble;
    private Interactable interactable;
    private RaycastHit hit;
    private bool placeAbleBarrelHeld;



    void Update()
    {
        HandleInput();
        HandleRaycasting();

        if (!canHold && pickUpAble)
        {
            pickUpAble.transform.position = guide.position;
            pickUpAble.transform.RotateAround(guide.position, guide.right, 100 * Input.GetAxis("Mouse ScrollWheel"));
        }

    }

    private void HandleInput()
    {
        if (Input.GetMouseButtonDown(0))
        {
            if (!canHold)
                Throw();
            else
                Pickup();
        }
        if (Input.GetMouseButtonDown(1))
        {
            if (!canHold)
                SetDown();
        }
        if (Input.GetKeyDown(KeyCode.E))
        {
            if (interactable)
            {
                interactable.Interact();
            }
            if (!placeAbleBarrelHeld)
            {
                return;
            }
            else if (pickUpAble.GetComponent<DrinkBarrel>().CheckForSpawning())
            {
                ClearHands();
            }



        }
    }

    private void HandleRaycasting()
    {
        if (Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, 3f, interactionLayers))
        {
            if (hit.collider.GetComponentInChildren<Pickup>() || hit.transform.GetComponentInParent<Pickup>() || hit.transform.GetComponent<Pickup>())
            {
                if (!pickUpAble)
                {
                    pickUpAble = hit.transform.gameObject;
                    if(pickUpAble.GetComponent<DrinkBarrel>())
                    {
                        placeAbleBarrelHeld = true;
                    }
                }
            }
            else if (canHold)
            {
                pickUpAble = null;
            }
            if (hit.collider.GetComponent<Interactable>())
            {
                interactable = hit.collider.GetComponent<Interactable>();
            }
            else
            {
                interactable = null;
            }
        }


        Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * 3f, Color.yellow);
    }

    private void ClearHands()
    {
        pickUpAble = null;
        canHold = true;
        placeAbleBarrelHeld = false;
    }

    private void SetDown()
    {
        if (!pickUpAble)
            return;

        pickUpAble.GetComponent<Rigidbody>().useGravity = true;
        pickUpAble.GetComponent<Rigidbody>().isKinematic = false;

        guide.GetChild(0).parent = null;
        ClearHands();

    }


    private void Pickup()
    {
        if (!pickUpAble)
            return;


        pickUpAble.transform.SetParent(guide);


        pickUpAble.GetComponent<Rigidbody>().useGravity = false;
        pickUpAble.GetComponent<Rigidbody>().isKinematic = true;

        pickUpAble.transform.position = guide.position;


        canHold = false;

    }

    private void Throw()
    {
        if (!pickUpAble)
            return;

        pickUpAble.GetComponent<Rigidbody>().useGravity = true;
        pickUpAble.GetComponent<Rigidbody>().isKinematic = false;

        guide.GetChild(0).gameObject.GetComponent<Rigidbody>().velocity = transform.forward * speed;
        guide.GetChild(0).parent = null;
        ClearHands();
    }
}