using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Valve.VR;

public class Behaviour : MonoBehaviour {

	public SteamVR_Input_Sources handType;
	public SteamVR_Action_Boolean teleportAction;
	public SteamVR_Behaviour_Pose controllerPose;
	public SteamVR_Action_Boolean grabAction;
	public LineRenderer RayPrefab;
    private LineRenderer Ray;
	private Vector3 hitPoint;

	public Transform cameraRigTransform;
	public GameObject teleportReticlePrefab;
	private GameObject reticle;
	private Transform teleportReticleTransform;
	public Transform headTransform;
	public Vector3 teleportReticleOffset;
	public LayerMask teleportMask;
	private bool shouldTeleport;

	private float fadeDuration = 2f;

	private GameObject collidingObject;
	private GameObject objectInHand;

	// Update is called once per frame
	void Update () {
		if (GetTeleport())
		{
    		print("Teleport " + handType);
			if (Ray == null) {
                Ray = Instantiate(RayPrefab, this.transform.position, Quaternion.identity);
				reticle = Instantiate(teleportReticlePrefab);
				teleportReticleTransform = reticle.transform;
			}

			if (Ray != null) {
				RaycastHit hit;
            	Ray.transform.position = gameObject.transform.position;
            	Ray.transform.rotation = gameObject.transform.rotation;
				Debug.Log("Raycast");
				if (Physics.Raycast(new Ray (Ray.transform.position, Ray.transform.rotation*Vector3.forward), out hit, 100)) {
					hitPoint = hit.point;
					reticle.SetActive(true);
					teleportReticleTransform.position = hitPoint + teleportReticleOffset;shouldTeleport = true;
					Debug.Log(hitPoint);
                }
				else {
					reticle.SetActive(false);
				}

        	}
		}
		if(GetTeleportUp()) {
			Destroy(Ray);
			Destroy(reticle);
			if(shouldTeleport) {
				Teleport();
			}

		}

		if (GetGrabDown()) {
			Debug.Log("grabbed");
   			if(collidingObject) {

				GrabObject();
			}
		}

		if(GetGrabUp()) {
			Debug.Log("released");
			if(objectInHand) {

				ReleaseObject();
			}
		}

}

	private void FadeToBlack() {
		SteamVR_Fade.Start(Color.black, 0f);
	}

	private void FadeFromBlack() {
		SteamVR_Fade.Start(Color.black, 0f);
		SteamVR_Fade.Start(Color.clear, fadeDuration);
	}


	public bool GetTeleport() {
    	return teleportAction.GetState(handType);
	}

	public bool GetTeleportUp() {
    	return teleportAction.GetStateUp(handType);
	}

	public bool GetGrabDown() {
    	return grabAction.GetStateDown(handType);
	}

	public bool GetGrabUp() {
    	return grabAction.GetStateUp(handType);
	}

	private void Teleport()
	{
		FadeToBlack();
    	shouldTeleport = false;
    	reticle.SetActive(false);
    	Vector3 difference = cameraRigTransform.position - headTransform.position;
    	difference.y = 0;
    	cameraRigTransform.position = hitPoint + difference;
		Invoke("FadeFromBlack", fadeDuration);

	}

	private void SetCollidingObject(Collider colObj) {
		if (collidingObject || !colObj.GetComponent<Rigidbody>()) {
			return;
		}
		collidingObject = colObj.gameObject;
	}

	public void OnTriggerEnter(Collider other) {
    	SetCollidingObject(other);
	}

	public void OnTriggerStay(Collider other) {
    	SetCollidingObject(other);
		}
	public void OnTriggerExit(Collider other) {
    	if (!collidingObject) {
        	return;
    	}
		 collidingObject = null;
	}

	private void GrabObject() {
    	objectInHand = collidingObject;
    	collidingObject = null;
    	var joint = AddFixedJoint();
    	joint.connectedBody = objectInHand.GetComponent<Rigidbody>();
	}

	private FixedJoint AddFixedJoint() {
    	FixedJoint fx = gameObject.AddComponent<FixedJoint>();
    	fx.breakForce = 20000;
    	fx.breakTorque = 20000;
    	return fx;
	}

	private void ReleaseObject() {
    	if (GetComponent<FixedJoint>())
    	{
        	GetComponent<FixedJoint>().connectedBody = null;
        	Destroy(GetComponent<FixedJoint>());
        	objectInHand.GetComponent<Rigidbody>().velocity = controllerPose.GetVelocity();
        	objectInHand.GetComponent<Rigidbody>().angularVelocity = controllerPose.GetAngularVelocity();
    }
    objectInHand = null;
	}
}