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


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

    public GameObject arrowLeft;
    public GameObject arrowRight;
    //public GameObject arrow;

    public Animator m_Animator;

    public TMP_Text textNumber;

    public List<int> images; 

    private Vector2 startTouchPosition;
    private Vector2 endTouchPosition;

    private GameObject image;

    public List<GameObject> imageAndTexts;
    private int indexList = 0;
 
    // Start is called before the first frame update
    void Start()
    {
        textSteps.text = lengths[0].text;
        textNumber.text = "Step 1/" + (lengthTexts+1);
        arrowLeft.gameObject.SetActive(false);
    }

    // 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();
            }else{
                PreviousText();
            }
            if(endTouchPosition.y + 100 < startTouchPosition.y){
                SwipeDown();
            } 
            if(endTouchPosition.y - 100 > startTouchPosition.y){
                SwipeUp();
            }
        }
    }

    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);
             }
            if(images.Contains(numberImage - 1)){
                DisableImageStep();
            }
            if(images.Contains(numberImage)){
                SetImageStep();
            }else{
                textSteps.text = lengths[numberImage].text;
                textNumber.text = "Step" + (numberImage+1) + "/" + (lengthTexts+1);
            }
        }
    }

     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);
            }
            if(images.Contains(numberImage + 1)){
                DisableImageStep();
            }
            if(images.Contains(numberImage)){
                SetImageStep();
            }else{
                textSteps.text = lengths[numberImage].text;
                textNumber.text = "Step" + (numberImage+1) + "/" + (lengthTexts+1);
            }
        }
    }

    private void SwipeDown(){
        m_Animator.ResetTrigger("SwipeUp");
        m_Animator.SetTrigger("SwipeDown");
    }
      private void SwipeUp(){
        m_Animator.ResetTrigger("SwipeDown");
        m_Animator.SetTrigger("SwipeUp");
    }

    private void SetImageStep(){
        textSteps.text = "";
        textNumber.text = "Step" + (numberImage+1) + "/" + (lengthTexts+1);
        image = imageAndTexts[indexList];
        indexList ++;
        image.SetActive(true);
    }

    private void DisableImageStep(){
        image.SetActive(false);
    }
}