using UnityEngine;

namespace DDD
{
    public class CellManager : MonoBehaviour
    {
        public RectTransform cellCanvas;
        public CellUI cell;

        public int minX = -20;
        public int maxX = 20;
        public int minZ = -20;
        public int maxZ = 20;

        // 0 == 비어있음, 1 == 차있음, 2 == 잠김
        public const int offsetZ = 40;
        private const int mapSize = 80;
        private int[] tiles;
        private CellUI[] tileUIs;

        void Start()
        {
            tiles = new int [mapSize * mapSize];

            // TODO: 데이터 입력
            for (int i = 0; i < mapSize * mapSize; i++)
            {
                tiles[i] = 0;
            }

            cell.transform.SetParent(null);
            cell.gameObject.SetActive(false);

            tileUIs = new CellUI[mapSize * mapSize];
            for (int i = 0; i < mapSize * mapSize; i++)
            {
                var newCell = Instantiate(cell, cellCanvas);
                newCell.gameObject.SetActive(true);
                tileUIs[i] = newCell.GetComponent<CellUI>();
            }

            UpdateCells();
        }

        public static Vector3 CellToWorld(Vector2Int cellPos)
        {
            var worldX = (cellPos.x - cellPos.y) * 0.5f * 1.414f; // sqrt(2)
            var worldZ = -(cellPos.x + cellPos.y) * 0.5f * 1.414f + offsetZ;
            return new Vector3(worldX, 0f, worldZ);
        }

        public static Vector2Int WorldToCell(Vector3 worldPos)
        {
            var cellX = Mathf.RoundToInt((worldPos.x - (worldPos.z - offsetZ)) / 1.414f);
            var cellY = Mathf.RoundToInt((-(worldPos.z - offsetZ) - worldPos.x) / 1.414f);
            return new Vector2Int(cellX, cellY);
        }

        public static int GetCellID(Vector2Int cellPos)
        {
            return cellPos.x + cellPos.y * mapSize;
        }

        public static Vector3 GetCellWorldPos(int cellPos)
        {
            int x = cellPos % mapSize; // x는 열 (가로)
            int y = cellPos / mapSize; // y는 행 (세로)
            return CellToWorld(new Vector2Int(x, y));
        }

        private void Update()
        {
            //UpdateCells();
        }

        public void UpdateCells()
        {
            for (int i = 0; i < mapSize * mapSize; i++)
            {
                var worldPos = GetCellWorldPos(i);
                // 바운더리체크 함수로 빼기
                if (minX > worldPos.x || worldPos.x > maxX)
                {
                    tileUIs[i].gameObject.SetActive(false);
                    continue;
                }

                if (minZ > worldPos.z || worldPos.z > maxZ)
                {
                    tileUIs[i].gameObject.SetActive(false);
                    continue;
                }

                tileUIs[i].SetTile(tiles[i]);

                tileUIs[i].gameObject.SetActive(true);
                tileUIs[i].transform.position = GetCellWorldPos(i);
            }
        }

        public void SetupCell(Vector3 position)
        {
            tiles[GetCellID(WorldToCell(position))] = 1;
        }
    }
}