using UnityEngine;
using System.Collections;

public class MoveBall : MonoBehaviour
{
    public Vector3 MoveOffset;

    private float easeInOutQuad(float value)
    {
        value /= 0.5f;
        if (value < 1) return 0.5f * value * value;
        value--;
        return -0.5f * (value * (value - 2.0f) - 1.0f);
    }

    private Vector3 vStartPosition;
    private float fAnimationPhase;
    private float fAnimationSpeed;

    private bool bAnimating;
    public IEnumerator Animate(Vector3 vTargetPosition)
    {
        bAnimating = true;
        while (fAnimationPhase < 1.0f)
        {
            fAnimationPhase = Mathf.Clamp01(fAnimationPhase + Time.deltaTime * fAnimationSpeed);
            float fEasedPhase = easeInOutQuad(fAnimationPhase);

            // apply animation
            transform.position = Vector3.Lerp(vStartPosition, vTargetPosition, fEasedPhase);

            yield return null; // progress one frame
        }
        bAnimating = false;
    }

    private void ExecuteAnimation(float animationSpeed)
    {
        if (!bAnimating)
        {
            Debug.Log("Animating");
            fAnimationPhase = 0.0f;
            fAnimationSpeed = animationSpeed;
            vStartPosition = transform.position;

            StartCoroutine(Animate(vStartPosition + MoveOffset));
        }
    }

    // Use this for initialization
    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {
        // Left click (Mouse0) adds MoveOffset to the current position
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            ExecuteAnimation(1.0f);
        }

        // Modify this class so that right click (Mouse1) causes the ball to
        // move in the opposite direction while also moving half as fast.
        // NOTE: You are not allowed to assign to MoveOffset, only use its value.
        if (Input.GetKeyDown(KeyCode.Mouse1))
        {

        }

        // Modify this class so that pressing the space bar doubles the speed of
        // both movement animations. Pressing it again restores the speeds back
        // to normal.
        if (Input.GetKeyDown(KeyCode.Space))
        {

        }
    }
}