using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.Json;
using Godot;

namespace Generator;

/// <summary>
/// 预制房间数据生成器
/// </summary>
public static class RoomPackGenerator
{
	private static string currDir = System.Environment.CurrentDirectory;
	
	/// <summary>
	/// 执行生成操作
	/// </summary>
    public static void Generate()
    {
        //地图路径
		var tileDir = GameConfig.RoomTileDir;
		//地图描述数据路径
		var tileDataDir = GameConfig.RoomTileDataDir;
		
		var tileDirInfo = new DirectoryInfo(tileDir);
		var tileDataDirInfo = new DirectoryInfo(tileDataDir);

		//所有地图列表
		var mapList = new HashSet<string>();
		
		//收集所有名称
		var fileDataInfos = tileDataDirInfo.GetFiles();
		foreach (var fileInfo in fileDataInfos)
		{
			mapList.Add(RemoveExtension(fileInfo.Name));
		}
		//收集所有名称
		var fileInfos = tileDirInfo.GetFiles();
		foreach (var fileInfo in fileInfos)
		{
			if (fileInfo.Extension == ".tscn")
			{
				mapList.Add(RemoveExtension(fileInfo.Name));
			}
		}
		
		//剔除多余的 tile.json
		var arrays = mapList.ToArray();
		foreach (var item in arrays)
		{
			if (!File.Exists(tileDir + item + ".tscn"))
			{
				mapList.Remove(item);
				var filePath = tileDataDir + item + ".json";
				if (File.Exists(filePath))
				{
					GD.Print($"未找到'{tileDir + item}.tscn', 删除配置文件: {filePath}");
					File.Delete(filePath);
				}
			}
		}

		//手动生成缺失的 tile.json
		foreach (var item in mapList)
		{
			if (!File.Exists(tileDataDir + item + ".json"))
			{
				var tscnName = tileDir + item + ".tscn";
				var packedScene = ResourceManager.Load<PackedScene>(tscnName, false);
				if (packedScene != null)
				{
					var dungeonRoomTemplate = packedScene.Instantiate<DungeonRoomTemplate>();
					var usedRect = dungeonRoomTemplate.GetUsedRect();
					var dungeonTile = new DungeonTile(dungeonRoomTemplate);
					dungeonTile.SetFloorAtlasCoords(new List<Vector2I>() { new Vector2I(0, 8) });
					//计算导航网格
					dungeonTile.GenerateNavigationPolygon(0);
					var polygonData = dungeonTile.GetPolygonData();
					DungeonRoomTemplate.SaveConfig(new List<DoorAreaInfo>(), usedRect.Position, usedRect.Size, polygonData.ToList(), item);
					dungeonRoomTemplate.QueueFree();
				}
			}
		}

		var list = new List<DungeonRoomSplit>();
		//整合操作
		foreach (var item in mapList)
		{
			var configPath = tileDataDir + item + ".json";
			var configText = File.ReadAllText(configPath);
			var roomInfo = DungeonRoomTemplate.DeserializeDungeonRoomInfo(configText);
			var split = new DungeonRoomSplit();
			split.ScenePath = ToResPath(tileDir + item + ".tscn");
			split.ConfigPath = ToResPath(configPath);
			split.RoomInfo = roomInfo;
			list.Add(split);
		}

		//写出配置
		var config = new JsonSerializerOptions();
		config.WriteIndented = true;
		var text = JsonSerializer.Serialize(list, config);
		File.WriteAllText(GameConfig.RoomTileConfigFile, text);

		GD.Print("地牢房间配置, 重新打包完成!");
    }
    
    private static string ToResPath(string path)
    {
	    var field = path.Substring(currDir.Length + 1);
	    field = field.Replace("\\", "/");
	    return "res://" + field;
    }

    private static string RemoveExtension(string name)
    {
	    var index = name.LastIndexOf(".", StringComparison.Ordinal);
	    if (index >= 0)
	    {
		    return name.Substring(0, index);
	    }

	    return name;
    }
}