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

namespace Grid {
    public class GridSystemVisual : MonoBehaviour {
        [SerializeField] private Transform GridSystemVisualSinglePrefab;
        private GridSystemVisualSingle[,] gridSystemVisualSingleArray;

        public static GridSystemVisual Instance { get; private set; }

        private void Awake() {
            if (Instance is not null) {
                Debug.LogError($"There is more than one GridSystemVisual! {transform} - {Instance}");
                Destroy(gameObject);
                return;
            }

            Instance = this;
        }

        private void Start() {
            int width = LevelGrid.Instance.GetWidth();
            int height = LevelGrid.Instance.GetHeight();
            gridSystemVisualSingleArray = new GridSystemVisualSingle[width, height];

            for (int x = 0; x < width; x++) {
                for (int z = 0; z < height; z++) {
                    Transform gridSystemVisualSingleTransform = Instantiate(GridSystemVisualSinglePrefab, LevelGrid.Instance.GetWorldPosition(new(x, z)), Quaternion.identity);
                    gridSystemVisualSingleArray[x, z] = gridSystemVisualSingleTransform.GetComponent<GridSystemVisualSingle>();
                }
            }
        }

        private void Update() => UpdateGridVisual();

        public void HideAllGridPosition() {
            foreach (GridSystemVisualSingle gridSystemVisualSingle in gridSystemVisualSingleArray)
                gridSystemVisualSingle.Hide();
        }

        public void ShowGridPositionList(List<GridPosition> gridPositionList) {
            foreach (GridPosition gridPosition in gridPositionList)
                gridSystemVisualSingleArray[gridPosition.X, gridPosition.Z].Show();
        }

        private void UpdateGridVisual() {
            HideAllGridPosition();
            ShowGridPositionList(UnitActionSystem.Instance.SelectedUnit.MoveAction.GetValidActionGridPositionList());
        }
    }
}