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

public class DoorDrag : MonoBehaviour {
    public GameObject playerCam;
    public float maxDistance = 4.0f;
    public string targetTag;
    public Transform grabber; // here's the needed "grab"-object target

    private Ray playerAim;
    private Vector3 currentTarget;
    private GameObject currentHitElement;

    private void RaycastProc() {
        playerAim = playerCam.GetComponent<Camera>().ViewportPointToRay(new Vector3(0.5f, 0.5f, 0));
        RaycastHit hit;
        currentHitElement = null;

        Debug.DrawRay(playerAim.origin, playerAim.direction * maxDistance, Color.red, 0f, false);
        currentTarget = playerAim.origin + playerAim.direction * maxDistance; // endpoint of ray

        if (Physics.Raycast (playerAim, out hit, maxDistance)){
            if(hit.collider.gameObject.tag == targetTag) {
                currentTarget = hit.point; // hitpoint of ray, if found
                currentHitElement = hit.collider.gameObject;
                Debug.DrawRay(hit.point + new Vector3(-.3f, 0f, 0f), new Vector3(.6f, 0f, 0f), Color.green);
                Debug.DrawRay(hit.point + new Vector3(0f, -.3f, 0f), new Vector3(0f, .6f, 0f), Color.green);
                Debug.DrawRay(hit.point + new Vector3(0f, 0f, -.3f), new Vector3(0f, 0f, .6f), Color.green);
            }
        }
    }

    void LateUpdate() {
        RaycastProc();
        grabber.position = currentTarget;
    }

    void Update () {
        SpringJoint j = grabber.gameObject.GetComponent<SpringJoint>();
        if((Input.GetKeyDown(KeyCode.E) || Input.GetMouseButtonDown(0))) {
            if(currentHitElement != null) {
                if(j.connectedBody == null) {
                    // connect to door
                } else {
                    // free door
                }
            } else {
                // free door too
            }
        }
    }

}