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

public class Tile : MonoBehaviour
{
    private Vector3 firstPosition;
    private Vector3 finalPosition;
    private float swipeAngle;
    private Vector3 tempPosition;

    //Menampung data posisi tile
    public float xPosition;
    public float yPosition;
    public int column;
    public int row;
    private Grid grid;
    private GameObject otherTile;

    // Start is called before the first frame update
    void Start()
    {
        //Menentukan posisi dari tile
        grid = FindObjectOfType<Grid>();
        xPosition = transform.position.x;
        yPosition = transform.position.y;
        column = Mathf.RoundToInt((xPosition - grid.startPos.x) / grid.offset.x);
        row = Mathf.RoundToInt((yPosition - grid.startPos.y) / grid.offset.x);
    }

    // Update is called once per frame
    void Update()
    {
        xPosition = (column * grid.offset.x) + grid.startPos.x;
        yPosition = (row * grid.offset.y) + grid.startPos.y;
        SwipeTile();
    }

    void OnMouseDown()
    {
      //Mendapatkan titik awal sentuhan jari
      firstPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
    }

    void OnMouseUp()
    {
        //Mendapatkan titik akhir sentuhan jari
        finalPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        CalculateAngle();
    }

    void CalculateAngle()
    {
        //Menghitung sudut antara posisi awal dan posisi akhir
        swipeAngle = Mathf.Atan2(finalPosition.y - firstPosition.y, finalPosition.x - firstPosition.x) * 180 / Mathf.PI;
        MoveTile();
    }

    void SwipeTile()
    {
        if (Mathf.Abs(xPosition - transform.position.x) > .1)
        {
            //Move towards the target
            tempPosition = new Vector2(xPosition, transform.position.y);
            transform.position = Vector2.Lerp(transform.position, tempPosition, .4f);
        }
        else
        {
            //Directly set the position
            tempPosition = new Vector2(xPosition, transform.position.y);
            transform.position = tempPosition;
            grid.tiles[column, row] = this.gameObject;
        }

        if (Mathf.Abs(yPosition - transform.position.y) > .1)
        {
            //Move towards the target
            tempPosition = new Vector2(transform.position.x, yPosition);
            transform.position = Vector2.Lerp(transform.position, tempPosition, .4f);
        }
        else
        {
            //Directly set the position
            tempPosition = new Vector2(transform.position.x, yPosition);
            transform.position = tempPosition;
            grid.tiles[column, row] = this.gameObject;
        }
    }

    void MoveTile()
    {
        if (swipeAngle > -45 && swipeAngle <= 45)
        {
            //Right swipe
            SwipeRightMove();
        }
        else if (swipeAngle > 45 && swipeAngle <= 135)
        {
            //Up swipe
            SwipeUpMove();
        }
        else if (swipeAngle > 135 || swipeAngle <= -135)
        {
            //Left swipe
            SwipeLeftMove();
        }
        else if (swipeAngle < -45 && swipeAngle >= -135)
        {
            //Down swipe
            SwipeDownMove();
        }
    }

    void SwipeRightMove()
    {
        //Menukar posisi dengan sebelah kanan nya
        otherTile = grid.tiles[column + 1, row];
        otherTile.GetComponent<Tile>().column -= 1;
        column += 1;
    }

    void SwipeUpMove()
    {
        //Menukar posisi dengan sebelah atasnya
        otherTile = grid.tiles[column, row + 1];
        otherTile.GetComponent<Tile>().row -= 1;
        row += 1;
    }

    void SwipeLeftMove()
    {
        //Menukar posisi dengan sebelah kirinya
        otherTile = grid.tiles[column - 1, row];
        otherTile.GetComponent<Tile>().column += 1;
        column -= 1;
    }

    void SwipeDownMove()
    {
        //Menukar posisi denhgan sebelah bawahnya
        otherTile = grid.tiles[column, row - 1];
        otherTile.GetComponent<Tile>().row += 1;
        row -= 1;
    }
}