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

public class SwipeScript : MonoBehaviour
{
    public Text textSteps;
    public List<Text> lengths;
    public int numberImage;
    public int lengthTexts;

    public Button arrowLeft;
    public Button arrowRight;


    private Vector2 startTouchPosition;
    private Vector2 endTouchPosition; 

    // Start is called before the first frame update
    void Start()
    {
        Button btnLeft = arrowLeft.GetComponent<Button>();
        Button btnRight = arrowRight.GetComponent<Button>();
        arrowLeft.gameObject.SetActive(false);
		btnLeft.onClick.AddListener(PreviousText);
		btnRight.onClick.AddListener(NextText);
        textSteps.text = lengths[0].text;
    }

    // Update is called once per frame
    void Update()
    {
        if(Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began){
            startTouchPosition = Input.GetTouch(0).position;
        }
        if(Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Ended){
            endTouchPosition = Input.GetTouch(0).position;
            if(endTouchPosition.x < startTouchPosition.x){
                NextText();
            }
            if(endTouchPosition.x > startTouchPosition.x){
                PreviousText();
            }
        }
    }

    private void NextText(){
        if(numberImage < lengthTexts)
        {
            numberImage ++;
            if(numberImage == lengthTexts){
                arrowRight.gameObject.SetActive(false);
            }else{
                arrowRight.gameObject.SetActive(true);
            }
            if(numberImage != 0){
                arrowLeft.gameObject.SetActive(true);
             }
            textSteps.text = lengths[numberImage].text;
        }
    }

     private void PreviousText(){
        if(numberImage > 0) {
            numberImage --;
            if(numberImage == 0){
                arrowLeft.gameObject.SetActive(false);
            }else{
                arrowLeft.gameObject.SetActive(true);
            }
             if(numberImage != lengthTexts){
                arrowRight.gameObject.SetActive(true);
             }
            textSteps.text = lengths[numberImage].text; 
        }
    }
}