using System.Collections.Generic;
using UnityEngine;

namespace HexGrid.MapHelper
{
    public static class HexUtils
    {
        public static readonly Vector2Int[] neighbors =
        {
            new Vector2Int(1, 0),
            new Vector2Int(+1, 0),
            new Vector2Int(+1, -1),
            new Vector2Int(0, -1),
            new Vector2Int(-1, 0),
            new Vector2Int(-1, +1),
            new Vector2Int(0, +1)
        };
        
        public static Vector3 DetermineTileSize(GameObject tileObject,out Bounds bounds)
        {
            var meshFilter = tileObject.GetComponentInChildren<MeshFilter>(true);
            bounds = meshFilter.sharedMesh.bounds;
            return new Vector3(bounds.size.x, 0,bounds.size.y);
        }
        // 构建地块Id
        public static string MakeTileId(Vector2Int tileCoords)
        {
            var x = tileCoords.x;
            var y = tileCoords.y;
            return $"tile:({x},{y})";
        }
        // 通过id，解析地块
        public static Vector2Int ParseTileId(string tileString)
        {
            const string prefix = "tile:";
            if (string.IsNullOrEmpty(tileString))
                return Vector2Int.zero;
            // 检查是否以 "tile:" 开头
            if (!tileString.StartsWith(prefix))
                return Vector2Int.zero;
            int startIndex = prefix.Length;
            int endIndex = tileString.Length - 1;
            if (endIndex <= startIndex)
                return Vector2Int.zero;
            
            var coordsPart = tileString.Substring(startIndex,endIndex);
            var coords = coordsPart.Split(',');
            if (coords.Length != 2)
                return Vector2Int.zero;
            // 尝试解析 x 和 y 坐标
            if (int.TryParse(coords[0].Trim(), out var x) &&
                int.TryParse(coords[1].Trim(), out var y))
            {
                return new Vector2Int(x, y);
            }
            return Vector2Int.zero;
        }
        
        // 获得当前模块的邻接Tile
        public static List<Vector2Int> GetNeighborList(HexTile tile)
        {
            var list = new List<Vector2Int>();
            foreach (var neighbor in neighbors)
            {
                var x = tile.tileCoords.x + neighbor.x;
                var y = tile.tileCoords.y + neighbor.y;
                list.Add(new Vector2Int(x,y));
            }
            return list;
        }
    }
}