using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

    private float health = 300f;


    public GameObject laserPrefab;
    public ParticleSystem[] particlePrefabs;

    public float speed;
    public float laserSpeed; //velocidade do tiro
    public float laserRate; //a cada X segundos sai 1 tiro

    public float xmin;
    public float xmax;
    public float ymin;
    public float ymax;

    //permite 1 tiro a cada X tempo
    public float interval;
    float nextShot = 0.1f;


    void Start()
    {
        Clamping();
    }


    // Update is called once per frame
    void Update ()
    {
        MoveKeyboard();
        MoveMobile();
    }

    //evita que o player saia do campo de visao da tela. Aqui estamos atribuindo os valores
    void Clamping()
    {
        //descobre qual eh o tamanho da tela e assim me diz quais sao os limites
        float distance = transform.position.z - Camera.main.transform.position.z;

        //padding da posição X e Y
        float paddingX = transform.GetComponent<Renderer>().bounds.max.x;
        float paddingY = 0.4f;


        Vector3 leftmost = Camera.main.ViewportToWorldPoint(new Vector3(0,0,distance)); //left edge
        Vector3 rightmost = Camera.main.ViewportToWorldPoint(new Vector3(1,0,distance)); //right edge

        Vector3 bottommost = Camera.main.ViewportToWorldPoint(new Vector3(0,0,distance));
        Vector3 topmost = Camera.main.ViewportToWorldPoint(new Vector3(0,1,distance));


        xmin = leftmost.x + paddingX;
        xmax = rightmost.x - paddingX;
        ymin = bottommost.y + paddingY;
        ymax = topmost.y - paddingY;
    }

    void MoveKeyboard()
    {
        float vertical = Input.GetAxis("Vertical") * speed;
        float horizontal = Input.GetAxis("Horizontal") * speed;

        vertical *= Time.deltaTime;
        horizontal *= Time.deltaTime;
        transform.Translate (horizontal, vertical, 0f);

        //impede que o jogador saia da tela
        float newX = Mathf.Clamp (transform.position.x, xmin, xmax);
        float newY = Mathf.Clamp (transform.position.y, ymin, ymax);

        transform.position = new Vector3(newX, newY, transform.position.z);

        if (Input.GetKeyDown(KeyCode.Space) || Input.GetKey(KeyCode.Space))
        {
            // only shoot after interval
            if (Time.time >= nextShot)
            {
                nextShot = Time.time + interval; // update nextShot
                ShootLaser();
            }
            //InvokeRepeating("ShootLaser", 0.000001f, laserRate);
        }
    }

    void MoveMobile()
    {
        if (Input.touchCount > 0)
        {
            // The screen has been touched so store the touch
            Touch touch = Input.GetTouch(0);

            // If the finger is on the screen, move the object smoothly to the touch position
            if (touch.phase == TouchPhase.Stationary || touch.phase == TouchPhase.Moved)
            {
                // only shoot after interval
                if (Time.time >= nextShot)
                {
                    nextShot = Time.time + interval; // update nextShot
                    ShootLaser();
                }

                Vector3 offset = new Vector3 (0, 0.5f, 0);
                Vector3 touchPosition = Camera.main.ScreenToWorldPoint(new Vector3(touch.position.x, touch.position.y, 10));
                transform.position = Vector3.Lerp(transform.position, touchPosition + offset, speed * Time.deltaTime);
            }
        }
    }

    void ShootLaser()
    {
        print ("Laser shot");

        Vector3 offset = new Vector3 (0, 0.3f, 0);
        GameObject laser = Instantiate (laserPrefab, transform.position + offset, Quaternion.identity) as GameObject;
        laser.GetComponent<Rigidbody2D>().velocity = new Vector3 (0, laserSpeed, 0);
    }

    void OnTriggerEnter2D(Collider2D col)
    {
        LaserEnemy laser = col.gameObject.GetComponent<LaserEnemy>();

        if (laser)
        {
            health -= laser.GetDamage();
            laser.Hit ();
            print ("Player hit by laser! Health: " + health);

            if (health == 100f)
            {
                print ("VIDA ACABANDO!");
                //GameObject fire = (GameObject) Instantiate (particlePrefabs[0], this.transform.position, Quaternion.identity);
                //fire.transform.parent = this.transform;
            }

            if (health <= 0)
            {
                print ("Player morreu!");
                Destroy (this.gameObject);
                Instantiate (particlePrefabs[1], this.transform.position, Quaternion.identity);
            }
        }
    }

    bool TurnFireOn()
    {
        if (health == 100f)
            return true;
        else
            return false;
    }
}