using UnityEngine;
using System.Collections;

public class CameraMovement : MonoBehaviour
{
    public Transform Target;
    public float Distance = 5.0f;
    public float xSpeed = 250.0f;
    public float ySpeed = 120.0f;
    public float yMinLimit = -20.0f;
    public float yMaxLimit = 80.0f;
    public float xMinLimit = -20.0f;
    public float xMaxLimit = 80.0f;

    private float x;
    private float y;

    void Awake()
    {
        Vector3 angles = transform.eulerAngles;
        x = angles.x;
        y = angles.y;

        if (GetComponent<Rigidbody>() != null)
        {
            GetComponent<Rigidbody>().freezeRotation = true;
        }
    }

    void LateUpdate()
    {
        if (Target != null)
        {
            x += (float)(Input.GetAxis("Mouse X") * xSpeed * 0.02f);
            y -= (float)(Input.GetAxis("Mouse Y") * ySpeed * 0.02f);

            y = ClampAngle(y, yMinLimit, yMaxLimit);
            x = ClampAngle(x, xMinLimit, xMaxLimit);

            Quaternion rotation = Quaternion.Euler(y, x, 0);
            Vector3 position = rotation * (new Vector3(0.0f, 4.0f, -Distance)) + Target.position;

            transform.rotation = rotation;
            transform.position = position;
        }
    }

    private float ClampAngle(float angle, float min, float max)
    {
        if (angle < -360)
        {
            angle += 360;
        }
        if (angle > 360)
        {
            angle -= 360;
        }
        return Mathf.Clamp(angle, min, max);
    }
}