using System;
using System.Threading.Tasks;
using Configs;
using Data;
using Managers;
using UnityEngine;
using UnityEngine.Tilemaps;

namespace Map
{
    /// <summary>
    ///     表示游戏中的一个维度或场景区域。
    ///     实体管理器将根据此维度来组织和管理实体。
    /// </summary>
    public class Dimension : MonoBehaviour
    {
        [SerializeField] private bool defaultOpen;

        [SerializeField] [Tooltip("此维度的唯一标识符。如果为空，将使用GameObject的名称。")]
        private string _dimensionId;

        [SerializeField] public Landform landform;

        public Vector3 cameraPosition = new(0, 0, -10);

        public Entity.Entity focusEntity;
        public TileBase airWall;

        public DimensionDef dimensionDefinition;

        public Vector2Int DimensionSize { get; private set; }

        /// <summary>
        ///     获取此维度的唯一标识符。
        /// </summary>
        public string DimensionId
        {
            get
            {
                if (string.IsNullOrEmpty(_dimensionId)) _dimensionId = Guid.NewGuid().ToString();

                return _dimensionId;
            }
            // 内部设置器，允许在Awake中初始化或编辑器中赋值
            private set => _dimensionId = value;
        }

        /// <summary>
        ///     此维度下所有实体的根Transform。用于组织场景层级。
        /// </summary>
        public Transform DimensionRoot { get; private set; }

        private void Awake()
        {
            if (!airWall) airWall = Resources.Load<TileBase>("Tile/AirWall");

            var id = DimensionId; // 确保 DimensionId 已初始化
            var rootObj = new GameObject($"_Entities_{id}");
            rootObj.transform.SetParent(transform);
            DimensionRoot = rootObj.transform;

            Program.Instance.RegisterDimension(this);
            if (defaultOpen) Program.Instance.SetFocusedDimension(_dimensionId);

            var mapGeneratorId = ConfigManager.Instance.GetValue<string>(DimensionId);
            if (!string.IsNullOrEmpty(mapGeneratorId))
            {
                dimensionDefinition = DefineManager.Instance.FindDefine<DimensionDef>(mapGeneratorId);
                if (dimensionDefinition != null) _ = ApplyDimensionDef(dimensionDefinition);
            }
        }

        private void OnDestroy()
        {
            if (Program.Instance != null) // 检查单例是否仍然存在
                Program.Instance.UnregisterDimension(this);
        }

        public event Action<Dimension> OnDimensionLoaded;

        /// <summary>
        ///     应用维度定义，生成地图并设置边界。
        /// </summary>
        /// <param name="def">要应用的维度定义。</param>
        public async Task ApplyDimensionDef(DimensionDef def)
        {
            dimensionDefinition = def;
            landform.Clear();
            var maxWidth = DimensionSize.x;
            var maxHeight = DimensionSize.y;

            if (def.mapGenerators != null)
            {
                foreach (var defMapGenerator in def.mapGenerators)
                {
                    var workClass = TileManager.Instance.GetMapGeneratorWorkClass(defMapGenerator.defName);
                    if (workClass == null) continue;

                    var requiredSize = workClass.GetSize();
                    maxWidth = Mathf.Max(maxWidth, requiredSize.x);
                    maxHeight = Mathf.Max(maxHeight, requiredSize.y);
                }

                DimensionSize = new Vector2Int(maxWidth, maxHeight);
                cameraPosition = new Vector3(DimensionSize.x / 2f, DimensionSize.y / 2f, -10) + transform.position;
                landform.InitEntityCollisionArray(DimensionSize, new Vector2Int());
                foreach (var defMapGenerator in def.mapGenerators)
                    await TileManager.Instance.ApplyMapGenerator(defMapGenerator.defName, landform);
            }

            var size = landform.GetSize();
            var origin = landform.GetOrigin();
            var minX = origin.x;
            var minY = origin.y;
            var maxX = origin.x + size.x - 1;
            var maxY = origin.y + size.y - 1;
            const int borderWidth = 1;
            var airWallZ = origin.z;

            // 绘制上下边界
            for (var x = minX - borderWidth; x <= maxX + borderWidth; x++)
            {
                landform.SetBaseTile(airWall, new Vector3Int(x, maxY + borderWidth, airWallZ));
                landform.SetBaseTile(airWall, new Vector3Int(x, minY - borderWidth, airWallZ));
            }

            // 绘制左右边界
            for (var y = minY - borderWidth + 1; y <= maxY + borderWidth - 1; y++)
            {
                landform.SetBaseTile(airWall, new Vector3Int(minX - borderWidth, y, airWallZ)); // 左侧
                landform.SetBaseTile(airWall, new Vector3Int(maxX + borderWidth, y, airWallZ)); // 右侧
            }

            OnDimensionLoaded?.Invoke(this);
        }
    }
}