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

public class PlayerMovement : MonoBehaviour {

	[Header("Variables")]
	public Vector3 playerVelocity;
	public bool transition = false;
	private Rigidbody rb;
	private Coroutine horizontalMovementCoroutine;

	[Space]

	[Header("Acceleration")]
	//public Vector3 accelerationPerSecond = Vector3.one / 10f;
	public Vector3 maxVelocity;
	public float accelerationDuration;

	[Space]

	[Header("Deceleration")]
	//public Vector3 decelerationPerSecond = Vector3.one / 10f;
	public float decelerationDuration;

	private PlayerController playerController;

	// Use this for initialization
	void Start () {
		rb = GetComponent<Rigidbody>();
		playerController = GetComponent<PlayerController>();
	}

	// Update is called once per frame
	void Update () {

		//Check for Input
		if (Input.GetAxis("Horizontal") != 0)
		{
			if (horizontalMovementCoroutine == null) {	horizontalMovementCoroutine = StartCoroutine(Accelerate()); }
		}
		else if (playerController.IsWalking())
		{
			if (horizontalMovementCoroutine == null) {	horizontalMovementCoroutine = StartCoroutine(Decelerate()); }
		}
	}

	void FixedUpdate()
	{
		rb.velocity = playerVelocity;
	}

	IEnumerator Accelerate()
	{
		float timer = 0;
		Vector3 startVelocity = rb.velocity;
		while (timer < accelerationDuration)
		{
			timer = Mathf.Clamp(timer + Time.deltaTime, 0, accelerationDuration);
			float percentComplete = timer / accelerationDuration;
			playerVelocity = maxVelocity * Mathf.Pow(percentComplete, 2) + startVelocity;
			Debug.LogWarning("called");
			yield return null;
		}
		horizontalMovementCoroutine = null;
	}

	IEnumerator Decelerate()
	{
		Debug.Log("called");
		float timer = 0;
		Vector3 startVelocity = rb.velocity;
		while (timer < decelerationDuration)
		{
			timer = Mathf.Clamp(timer + Time.deltaTime, 0, decelerationDuration);
			float percentComplete = timer / decelerationDuration;
			playerVelocity = -maxVelocity * percentComplete * (percentComplete - 2) + startVelocity;
			//Debug.Log(-decelerationPerSecond * percentComplete * (percentComplete - 2) + startVelocity);
			yield return null;
		}
		playerVelocity = Vector3.zero;
		horizontalMovementCoroutine = null;
		//yield return null;
	}
}