using UnityEngine;
using System.Collections;

[AddComponentMenu("Infinite Camera-Control/Mouse Orbit with zoom")]
public class MouseLookPlus : MonoBehaviour
{

    public Transform target;

    public float xSpeed = 12.0f;
    public float ySpeed = 12.0f;

    public float scrollSpeed = 10.0f;

    public float zoomMin = 1.0f;
    public float zoomMax = 20.0f;

    public float distance = 2;
    public float Ypos;

    public Vector3 position;

    public bool isActivated;


    float x = 0.0f;
    float y = 0.0f;

    // Use this for initialization
    void Start()
    {
        Vector3 angels = transform.eulerAngles;
        x = angels.y;
        y = angels.x;
        position = -(transform.forward * distance) + target.position;
        transform.position = position;
        Ypos = transform.position.y;
    }

    // Update is called once per frame
    void LateUpdate()
    {




        if (Input.GetMouseButtonDown(0))
        {
            isActivated = true;
        }
        if (Input.GetMouseButtonUp(0))
        {
            isActivated = false;
        }


        if (target && isActivated)
        {

            x += Input.GetAxis("Mouse X") * xSpeed;
            y -= Input.GetAxis("Mouse Y") * ySpeed;


            transform.RotateAround(target.position, transform.up, x);

            transform.RotateAround(target.position, transform.right, y);




            transform.rotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y, 0);
            transform.rotation = Quaternion.LookRotation(target.position - transform.position);
            Ypos = transform.position.y;


            x = 0;
            y = 0;
        }
        else
        {

            if (Input.GetAxis("Mouse ScrollWheel") != 0)
            {

                distance = Vector3.Distance(transform.position, target.position);

                distance = ZoomLimit(distance - Input.GetAxis("Mouse ScrollWheel") * scrollSpeed, zoomMin, zoomMax);

                position = -(transform.forward * distance) + target.position;

                Ypos = position.y;
                transform.position = position;
            }
        }


        float d2 = Vector3.Distance(transform.position, target.position);
        if (d2 != distance) {
            position = -(transform.forward * distance) + target.position;
            position.y = Ypos;
            transform.position = position;

        }

    }


    public static float ZoomLimit(float dist, float min, float max) {
        if (dist < min)
            dist = min;
        if (dist > max)
            dist = max;
        return dist;
    }

}