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

public class Scrub : MonoBehaviour {
	public Animation anim;
	[Range(0.1f,10f)]
	public float inertia = 1.0f;
	float maxScrubVal = 1;
	float scrubVal = 0;

	Vector3 lastMousePosition;

	// Use this for initialization
	void Start () {
		lastMousePosition = Input.mousePosition;
	}

	// Update is called once per frame
	void Update()
	{
		//Test on Editor
		EditorInput();

		//For touch enabled devices
		//TouchInput();

	}
	void HandleTouch(Touch tch){
		scrubVal += tch.deltaPosition.x/Screen.width;
		scrubVal = Mathf.Clamp(scrubVal,-1,1);
		anim["CameraPath"].speed = scrubVal;
	}
	void NoTouch(){
		if (scrubVal < 0) {
			scrubVal += Time.deltaTime/inertia;
		}else if (scrubVal > 0) {
			scrubVal -= Time.deltaTime/inertia;
		}
		anim["CameraPath"].speed = scrubVal;
	}

	void TouchInput(){
		if (Input.touchCount > 0) {
			if (Input.GetTouch (0).phase == TouchPhase.Moved) {
				HandleTouch(Input.GetTouch(0));
			}else if (Input.GetTouch (0).phase == TouchPhase.Ended) {
				//Slowly stops animation when touch is ended
				NoTouch();
			}
		}
	}

	/// <summary>
	/// Following portion not needed for touch devices
	/// Couldn't test in any mobile devices at the moment so worked around with the following one
	/// </summary>
	void EditorInput(){
		if (Input.GetMouseButton (0)) {
			if (SimTouchInEditor().phase == TouchPhase.Moved) {
				HandleTouch (SimTouchInEditor());
			}
		} else {
			NoTouch ();
		}
		if(Input.GetMouseButtonUp(0)) lastMousePosition = Input.mousePosition;
	}
	Touch SimTouchInEditor(){
		Touch fakeTouch = new Touch ();
		fakeTouch.fingerId = 10;
		fakeTouch.position = Input.mousePosition;
		fakeTouch.deltaTime = Time.deltaTime;
		fakeTouch.deltaPosition = Input.mousePosition - lastMousePosition;
		fakeTouch.phase = (Input.GetMouseButtonDown (0) ? TouchPhase.Began :
			(fakeTouch.deltaPosition.sqrMagnitude > 1f ? TouchPhase.Moved : TouchPhase.Stationary));
		fakeTouch.tapCount = 1;
		return fakeTouch;
	}
}