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

public class swipe : MonoBehaviour
{
    public Color[] colors;
    public GameObject scrollbar, imageContent;
    private float scroll_pos = 0;
    private float[] pos;
    private bool runIt = false;
    private float time;
    private Button takeTheBtn;
    private int btnNumber;

    private bool isDragging = false;
    private Vector2 startDragPosition;
    private Vector2 endDragPosition;

    // Start is called before the first frame update
    void Start()
    {
        pos = new float[transform.childCount];
        float distance = 1f / (pos.Length - 1f);

        for (int i = 0; i < pos.Length; i++)
        {
            pos[i] = distance * i;
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (runIt)
        {
            float distance = 1f / (pos.Length - 1f);
            GecisiDuzenle(distance, pos, takeTheBtn);
            time += Time.deltaTime;

            if (time > 1f)
            {
                time = 0;
                runIt = false;
            }
        }

        if (Input.GetMouseButtonDown(0))
        {
            isDragging = true;
            startDragPosition = Input.mousePosition;
        }

        if (Input.GetMouseButtonUp(0))
        {
            isDragging = false;
            endDragPosition = Input.mousePosition;
            HandleSwipe();
        }

        if (isDragging)
        {
            scroll_pos = scrollbar.GetComponent<Scrollbar>().value;
        }
        else
        {
            for (int i = 0; i < pos.Length; i++)
            {
                if (scroll_pos < pos[i] + (1f / (pos.Length - 1f) / 2) && scroll_pos > pos[i] - (1f / (pos.Length - 1f) / 2))
                {
                    scrollbar.GetComponent<Scrollbar>().value = Mathf.Lerp(scrollbar.GetComponent<Scrollbar>().value, pos[i], 0.1f);
                }
            }
        }

        for (int i = 0; i < pos.Length; i++)
        {
            if (scroll_pos < pos[i] + (1f / (pos.Length - 1f) / 2) && scroll_pos > pos[i] - (1f / (pos.Length - 1f) / 2))
            {
                Debug.LogWarning("Current Selected Level" + i);
                transform.GetChild(i).localScale = Vector2.Lerp(transform.GetChild(i).localScale, new Vector2(1f, 1f), 0.1f);
                imageContent.transform.GetChild(i).localScale = Vector2.Lerp(imageContent.transform.GetChild(i).localScale, new Vector2(1.2f, 1.2f), 0.1f);
                imageContent.transform.GetChild(i).GetComponent<Image>().color = colors.Length > 1 ? colors[1] : Color.white;

                for (int j = 0; j < pos.Length; j++)
                {
                    if (j != i)
                    {
                        imageContent.transform.GetChild(j).GetComponent<Image>().color = colors.Length > 0 ? colors[0] : Color.white;
                        imageContent.transform.GetChild(j).localScale = Vector2.Lerp(imageContent.transform.GetChild(j).localScale, new Vector2(0.8f, 0.8f), 0.1f);
                        transform.GetChild(j).localScale = Vector2.Lerp(transform.GetChild(j).localScale, new Vector2(0.8f, 0.8f), 0.1f);
                    }
                }
            }
        }
    }

    private void HandleSwipe()
    {
        float distance = endDragPosition.x - startDragPosition.x;

        if (Mathf.Abs(distance) > 50f) // Minimum distance for swipe to be registered
        {
            if (distance > 0)
            {
                // Swipe Right
                btnNumber = Mathf.Max(btnNumber - 1, 0);
            }
            else
            {
                // Swipe Left
                btnNumber = Mathf.Min(btnNumber + 1, pos.Length - 1);
            }

            scroll_pos = pos[btnNumber];
            scrollbar.GetComponent<Scrollbar>().value = scroll_pos;
        }
    }

    private void GecisiDuzenle(float distance, float[] pos, Button btn)
    {
        for (int i = 0; i < pos.Length; i++)
        {
            if (scroll_pos < pos[i] + (distance / 2) && scroll_pos > pos[i] - (distance / 2))
            {
                scrollbar.GetComponent<Scrollbar>().value = Mathf.Lerp(scrollbar.GetComponent<Scrollbar>().value, pos[btnNumber], 1f * Time.deltaTime);
            }
        }

        for (int i = 0; i < btn.transform.parent.transform.childCount; i++)
        {
            btn.transform.name = ".";
        }
    }

    public void WhichBtnClicked(Button btn)
    {
        btn.transform.name = "clicked";
        for (int i = 0; i < btn.transform.parent.transform.childCount; i++)
        {
            if (btn.transform.parent.transform.GetChild(i).transform.name == "clicked")
            {
                btnNumber = i;
                takeTheBtn = btn;
                time = 0;
                scroll_pos = pos[btnNumber];
                runIt = true;
            }
        }
    }
}