using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BallFunction : MonoBehaviour {

    public GameObject obj;
    public Vector3 sp;
    public Vector3 ep;
    public float T;
    public Rigidbody rb;
    public enum BallType{
        FastBall,
        CurveBall,
        FolkBall,
    }

    public BallType bt;

    // Use this for initialization
    void Start () {
        rb = obj.GetComponent<Rigidbody> ();

    }
    public float ax(float t,BallType bt){
        if (bt == BallType.FastBall) {
            return 0.0f;
        }
        else
            return 0.0f;
    }
    private float ay(float t,BallType bt){
        if (bt == BallType.FastBall) {
            return -9.8f;
        }
        else
            return 0.0f;
    }
    private float az(float t,BallType bt){
        if (bt == BallType.FastBall)
            return 0.0f;
        else
            return 0.0f;
    }
    private float vx(float t,BallType bt){
        if (bt == BallType.FastBall)
            return 9.8f * t;
        else
            return 0.0f;
    }
    private float vy(float t,BallType bt){
        if (bt == BallType.FastBall)
            return -9.8f * t;
        else
            return 0.0f;
    }
    private float vz(float t,BallType bt){
        if (bt == BallType.FastBall)
            return 0.0f;
        else
            return 0.0f;
    }
    private float Vx(float t,BallType bt){
        if (bt == BallType.FastBall)
            return 4.9f * t * t;
        else
            return 0.0f;
    }
    private float Vy(float t,BallType bt){
        if (bt == BallType.FastBall)
            return -4.9f * t * t;
        else
            return 0.0f;
    }
    private float Vz(float t,BallType bt){
        if (bt == BallType.FastBall)
            return 0.0f;
        else
            return 0.0f;
    }


    public Vector3 FastBall(Vector3 sp, Vector3 ep,float T){

        Vector3 vi = new Vector3 ();
        Vector3 dir = ep - sp;
        vi.x = (dir.x - Vx(T,BallType.FastBall)) / T;
        vi.y = (dir.y - Vy(T,BallType.FastBall)) / T;
        vi.z = (dir.z - Vz(T,BallType.FastBall)) / T;

        rb.velocity = vi;
        return rb.velocity;
    }

    //public Vector3 CurveBall(Vector3 sp, Vector3 ep,float T){
    //  return;
    //}

    //public Vector3 FolkBall(Vector3 sp, Vector3 ep,float T){
    //  return;
    //}

    public Vector3 Throw(Vector3 sp, Vector3 ep, float T, BallType bt){
        rb.transform.position = sp;
        switch(bt){
        default:
        case BallType.FastBall:
            return FastBall (sp, ep, T);
        case BallType.CurveBall:
            return new Vector3 (0, 0, 0);
        case BallType.FolkBall:
            return new Vector3 (0, 0, 0);
        }
    }


    // Update is called once per frame
    void Update () {
        if (Input.GetMouseButtonDown (0)) {
            Throw (sp, ep, T, bt);
            rb.velocity += new Vector3 (vx (Time.deltaTime,bt), vy (Time.deltaTime,bt), vz (Time.deltaTime,bt));
        }
    }
}