using UnityEngine;
using System.Collections;

public class Raycast : MonoBehaviour {
    public LayerMask layerMask;
    public float force = 150f;
	public LineRenderer linerenderer;
	public float counter = 0;
	public bool drawn = false;

    private Object box;
	// Use this for initialization
	void Start () {

	}


    void OnMouseDown()
    {

    }

    void DropItem()
    {
        Debug.Log("DROPINN");
		linerenderer.SetPosition (0, Vector3.zero);
		linerenderer.SetPosition (1, Vector3.zero);
        if(draggedItem != null)
        draggedItem.isKinematic = false;
        dragging = false;
		counter = 0;
		drawn = false;
    }

    bool dragging = false;
    Rigidbody2D draggedItem;

	// Update is called once per frame
	void Update () {
		Vector3 targetPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0));

        if (Input.GetMouseButtonDown(0))
        {
            targetPos = transform.InverseTransformPoint(targetPos);
            Debug.DrawRay(this.transform.position, targetPos);

			if(transform.localScale.x <0)
				targetPos.x = targetPos.x * -1;


            RaycastHit2D hit = Physics2D.Raycast(transform.position, targetPos, 500f, layerMask);
            if (hit != null && hit.transform != null && hit.transform.gameObject.tag == "Pickable")
            {

                GameObject tmp = hit.transform.gameObject;
                Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                RaycastHit2D hit2 = Physics2D.Raycast(ray.origin, ray.direction, 500f);
                if (hit2.transform != null && tmp == hit2.transform.gameObject)
                {
                    dragging = true;
                    //hit.transform.rigidbody2D.isKinematic = true;
                    draggedItem = hit.transform.rigidbody2D;
                }
            }
        }

        else if (dragging && Input.GetMouseButton(0))
        {
            RaycastHit2D hit = Physics2D.Raycast(this.transform.position, draggedItem.transform.position - this.transform.position, Mathf.Infinity, layerMask);
            Debug.DrawRay(this.transform.position, draggedItem.transform.position - this.transform.position);
			linerenderer.SetPosition (0, this.transform.position);
			//linerenderer.SetPosition (1, hit.transform.position);
			float dist = Vector2.Distance(this.transform.position,hit.transform.position);
			Debug.Log(dist.ToString());
			if(counter<dist && drawn==false)
			{
				counter += .1f/1;
				float x = Mathf.Lerp(0,dist,counter);
				Vector3 pointA = this.transform.position;
				Vector3 pointB = hit.transform.position;

				Vector2 pointAlongLine = x * Vector3.Normalize(pointB - pointA) + pointA;
				linerenderer.SetPosition(1, pointAlongLine);
			}
			else
			{
				drawn=true;
				linerenderer.SetPosition (1, hit.transform.position);
			}

            Vector2 newPos = new Vector2(draggedItem.position.x - targetPos.x, draggedItem.position.y - targetPos.y)*-1;
            draggedItem.velocity = Vector2.zero;
            draggedItem.AddForce(newPos * force);

            if (hit != null && hit.transform.gameObject.tag != "Pickable")
            {
                DropItem();

            }


        }

        if (dragging && Input.GetMouseButtonUp(0))
        {
            DropItem();
        }
	}
}