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

public class PlayerController : MonoBehaviour
{
    //References to other Game objects
    Camera cam;
    Rigidbody myRigidbody;

    //Editor exposed variables for easy balancing
    [SerializeField] private float speed = 10.0f;
    [SerializeField] private float strafeSpeed = 3.0f;
    [SerializeField] private float rotationSpeed = 5.0f;
    [SerializeField] private float maxFOV = 45.0f;



    [SerializeField] private LayerMask whatIsInteractable;

    float itemRotX, itemRotY;
    Transform viewItemLocation;
    GameObject currentItem;
    bool isHoldingItem = false;



    [SerializeField] List<GameObject> inventory = new List<GameObject>();



    // working variables for player movement
    float forwardMovement, sideMovement, rotationDeltaY, rotationDeltaX, rotX, rotY;



    // Start is called before the first frame update
    void Start()
    {
        myRigidbody = GetComponent<Rigidbody>();
        cam = GetComponentInChildren<Camera>();
        viewItemLocation = GameObject.Find("View Item Location").transform;

        Cursor.lockState = CursorLockMode.Locked;
    }

    // Update is called once per frame
    void Update()
    {
        //Load all of our inputs into float variables
        forwardMovement = Input.GetAxis("Vertical");
        sideMovement = Input.GetAxis("Horizontal");
        rotationDeltaY = Input.GetAxis("Mouse Y");
        rotationDeltaX = Input.GetAxis("Mouse X");

        if (isHoldingItem == true)
        {
            currentItem.transform.position = viewItemLocation.position;
        }

        else

        // Add up our rotation delta
        rotX = rotX + (rotationDeltaX * rotationSpeed);

        rotY = rotY + rotationDeltaY;
        rotY = Mathf.Clamp(rotY, -maxFOV, maxFOV);

        //Apply movement values to our player
        myRigidbody.velocity = (transform.forward * forwardMovement * speed) + (transform.right * sideMovement * strafeSpeed);


        //Apply rotation values to our player and camera
        transform.localRotation = Quaternion.Euler(new Vector3(0.0f, rotX, 0.0f));
        cam.transform.localRotation = Quaternion.Euler(new Vector3(-rotY, 0.0f, 0.0f));

        Ray eyeLine = new Ray(cam.transform.position, cam.transform.forward);
        RaycastHit item;

        if (Physics.Raycast(eyeLine, out item, 45.0f, whatIsInteractable))
        {
            if (Input.GetMouseButton(0))
            {
                isHoldingItem = true;
                currentItem = item.transform.gameObject;
                currentItem.GetComponent<Rigidbody>().velocity = new Vector3(0.0f, 0.0f, 0.0f);
            }
        }




        if (isHoldingItem == true)
        {
            Debug.Log("CI = " + currentItem);
            Debug.Log("VIL = " + viewItemLocation);

            currentItem.transform.position = viewItemLocation.position;

            itemRotX = itemRotX + rotationDeltaX;
            itemRotY = itemRotY + rotationDeltaY;

            currentItem.transform.localRotation = Quaternion.Euler(itemRotY, itemRotX, 0.0f);
        }

        if (Input.GetMouseButtonDown(0))
        {
            Inventory.Instance.AddItem(currentItem.GetComponent<ItemObject>().name);
            Destroy(currentItem.gameObject);

            Debug.Log("Added item to inventory");
            inventory.Add(currentItem);
            currentItem.SetActive(false);

            itemRotX = 0.0f;
            itemRotY = 0.0f;
            currentItem = null;
            isHoldingItem = false;
        }

        if (Input.GetMouseButton(1))
        {
            currentItem.GetComponent<Rigidbody>().velocity = new Vector3(0.0f, 0.0f, 0.0f);
            itemRotX = 0.0f;
            itemRotY = 0.0f;
            currentItem = null;
            isHoldingItem = false;

        }

        if (Input.GetKeyDown(KeyCode.Alpha1))
        {
            if (Inventory.Instance.GetInventorySize()>= 1)
            {
                isHoldingItem = true;
                currentItem = Instantiate(Inventory.Instance.GetItem(0));
                currentItem.GetComponent<Rigidbody>().velocity = new Vector3(0.0f, 0.0f, 0.0f);
            }
        }

        if (Input.GetKeyDown(KeyCode.Alpha2))
        {
            if (Inventory.Instance.GetInventorySize() >= 2)
            {
                isHoldingItem = true;
                currentItem = Instantiate(Inventory.Instance.GetItem(1));
                currentItem.GetComponent<Rigidbody>().velocity = new Vector3(0.0f, 0.0f, 0.0f);
            }
        }

        if (Input.GetKeyDown(KeyCode.Alpha3))
        {
            if (Inventory.Instance.GetInventorySize() >= 3)
            {
                isHoldingItem = true;
                currentItem = Instantiate(Inventory.Instance.GetItem(2));
                currentItem.GetComponent<Rigidbody>().velocity = new Vector3(0.0f, 0.0f, 0.0f);
            }
        }


    }


}