Dungeon Raiders Proto 2 (match 3 puzzle unity)

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

public class Cell : MonoBehaviour
{
    public GameObject focusGo;
    public GameObject focusGo2;

    public bool isSelected = false;
    public int row;
    public int col;

    public void Init(int row, int col) {
        this.row = row;
        this.col = col;
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
using System;
using DG.Tweening;

public class Game : MonoBehaviour
{
    public GameObject cellPrefab;
    public int maxRow;
    public int maxCol;
    public LineRenderer line;
    private Cell[,] cells;

    void Start()
    {
        this.cells = new Cell[this.maxRow, this.maxCol];

        for (int i = 0; i < maxRow; i++)
        {
            for (int j = 0; j < maxCol; j++)
            {
                var pos = new Vector2(j, -i);
                var go = Instantiate(this.cellPrefab, pos, Quaternion.identity);
                go.name = string.Format("({0},{1})", i, j);
                var cell = go.GetComponent<Cell>();
                this.cells[i, j] = cell;
                cell.Init(i, j);
            }
        }
    }


    private bool isDown = false;
    private List<Cell> list = new List<Cell>();
    private Cell currentCell;

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            this.isDown = true;
        }
        else if (Input.GetMouseButtonUp(0))
        {
            this.isDown = false;
            this.currentCell.focusGo.SetActive(false);
            this.currentCell.focusGo2.SetActive(false);
            this.currentCell = null;

            //3개 이상이면 블록 제거 
            if (list.Count >= 3)
            {
                foreach (var cell in this.list)
                {
                    this.cells[cell.row, cell.col] = null;
                }

                foreach (var cell in this.list)
                    cell.gameObject.SetActive(false);

                //라인렌더러 초기화
                this.line.positionCount = 0;

                this.StartCoroutine(this.CoDecreaseRow());

            }
            else
            {
                Debug.Log("연결된 블록 갯수 부족");
                foreach (var cell in this.list)
                    cell.focusGo2.SetActive(false);

                //라인렌더러 초기화
                this.line.positionCount = 0;
            }
            this.list.Clear();
        }

        if (this.isDown) {
            var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            var hit = Physics2D.Raycast(ray.origin, ray.direction);
            if (hit.collider != null) {
                var cell = hit.collider.GetComponent<Cell>();

                if (this.currentCell != cell) {

                    if (this.currentCell != null) {
                        var prevCell = this.currentCell;
                        prevCell.focusGo.SetActive(false);
                    }

                    this.currentCell = cell;

                    if (!list.Contains(this.currentCell))
                    {
                        //처음 블록 선택 
                        if (this.list.Count == 0)
                        {
                            Debug.Log("start");
                            list.Add(this.currentCell);
                            this.currentCell.focusGo.SetActive(true);
                            this.currentCell.focusGo2.SetActive(true);

                        }
                        else {
                            //마지막 선택된 셀과 인접해 있는가?
                            var dis = Vector3.Distance(list[list.Count - 1].transform.position, this.currentCell.transform.position);
                            Debug.Log(dis);
                            if (dis > 1.42f)
                            {
                                Debug.Log("인접해 있지 않음");
                                this.currentCell.focusGo.SetActive(true);
                            }
                            else {
                                this.list.Add(this.currentCell);
                                this.currentCell.focusGo.SetActive(true);
                                this.currentCell.focusGo2.SetActive(true);

                                //라인 렌더러 
                                this.UpdateLine();

                            }
                        }

                    }
                    else
                    {
                        Debug.Log("이미 선택된 cell");
                        var idx = list.IndexOf(this.currentCell);
                        for (int i = idx + 1; i < list.Count; i++) {
                            list[i].focusGo.SetActive(false);
                            list[i].focusGo2.SetActive(false);
                        }
                        list.RemoveRange(idx + 1, list.Count - 1 - idx);
                        this.currentCell.focusGo.SetActive(true);

                        //라인 렌더러 
                        this.UpdateLine();
                    }
                }
            }
        }

    }

    private IEnumerator CoDecreaseRow() {
        
        while (true)
        {
            var set = this.CalcMoveActionBlocks();
            if (set.Count == 0)
            {
                break;
            }
            foreach (var x in set)
            {
                //Debug.LogFormat("{0},{1} -> {2},{3}", x.Item1, x.Item2, x.Item1 + 1, x.Item2);
                var cell = this.cells[x.Item1, x.Item2];
                this.cells[x.Item1, x.Item2] = null;
                this.cells[x.Item1 + 1, x.Item2] = cell;
                this.cells[x.Item1 + 1, x.Item2].row = x.Item1 + 1;

                cell.transform.DOMoveY(cell.transform.position.y - 1, 0.07f);//.SetEase(Ease.InBounce);
                
            }
            yield return new WaitForSeconds(0.07f);
        }

        yield return null;
        
    }

    private HashSet<Tuple<int, int>> CalcMoveActionBlocks() {
        HashSet<Tuple<int, int>> set = new HashSet<Tuple<int, int>>();
        for (int i = this.maxRow - 1; i >= 0; i--)
        {
            for (int j = 0; j < this.maxCol; j++)
            {
                var cell = this.cells[i, j];
                if (cell == null)
                {
                    //Debug.LogErrorFormat("{0},{1}", i, j);
                    for (int row = i; row >= 0; row--)
                    {
                        if (this.cells[row, j] != null)
                        {
                            //Debug.LogFormat("---------->{0},{1}", row, j);
                            set.Add(new Tuple<int, int>(row, j));
                            break;
                        }
                    }
                }
            }
        }
        return set;
    }

    private void UpdateLine() {
        this.line.positionCount = this.list.Count;
        for (int i = 0; i < this.list.Count; i++)
        {
            var pos = this.list[i].transform.position;
            pos.z = 0;
            this.line.SetPosition(i, pos);
        }
    }
}