using UnityEngine;
using System.Collections;

public class FlightPlane : MonoBehaviour {

    public float speed;
    public float speedOffset;
    public Camera cameraPlane;

    // Use this for initialization
    void Start () {

    }

    void Update()
    {
        //1. Controlando Manches
        transform.Rotate (Input.GetAxis ("Vertical"), 0, -Input.GetAxis ("Horizontal"));

        transform.position += transform.forward * Time.deltaTime * speed;


//      //2. Controlando Altura Terreno
        float terrainHeight = Terrain.activeTerrain.SampleHeight (transform.position);

        if (terrainHeight > transform.position.y) {
                transform.position = new Vector3 (transform.position.x,
                                              terrainHeight,
                                              transform.position.z);
        }
//
//      //3. Controlando Velocidade
        speed -= transform.forward.y * Time.deltaTime * speedOffset;

        if (speed < 35) {
            speed = 35;
        }
//
//      //4. Vetor de Posiçao da Camera
        Vector3 moveCamTo = transform.position - transform.forward*10 + Vector3.up * 5;

        //5. Refinando a posiçao Camera
        float bias = 0.96f;
        cameraPlane.transform.position = cameraPlane.transform.position * bias +
                                        moveCamTo * (1-bias);

        //6. Para onde a camera deve olhar
        cameraPlane.transform.LookAt (transform.position + transform.forward * 30);
    }
}