using System.Collections.Generic;
using System.IO;
using UnityEngine;

namespace EditorTools
{
    // 导出JSON 根实体
    [System.Serializable]
    public class ExportLevelRoot
    {
        public int levelId;
        public string levelName;
        public int gridRows;
        public int gridCols;
        public int pointSpacing;
        public List<ExportArrowItem> arrows;
    }

    // 导出JSON 单条箭头实体
    [System.Serializable]
    public class ExportArrowItem
    {
        public int id;
        public int startPoint;
        public int endPoint;
        public string color;
        public List<string> path;
    }

    public static class LevelJsonExporter
    {
        /// <summary>
        /// 行列转点位ID（和游戏代码完全一致）
        /// </summary>
        public static int RowColToPointId(int row, int col, int totalCol)
        {
            return row * totalCol + col;
        }

        /// <summary>
        /// 点位ID转行列（和游戏代码完全一致）
        /// </summary>
        public static void PointIdToRowCol(int pointId, int totalCol, out int row, out int col)
        {
            row = pointId / totalCol;
            col = pointId % totalCol;
        }

        /// <summary>
        /// 根据前后两个点位，计算移动方向
        /// </summary>
        public static string GetDirection(int fromId, int toId, int totalCol)
        {
            PointIdToRowCol(fromId, totalCol, out int fRow, out int fCol);
            PointIdToRowCol(toId, totalCol, out int tRow, out int tCol);

            if (tRow < fRow) return "up";
            if (tRow > fRow) return "down";
            if (tCol < fCol) return "left";
            if (tCol > fCol) return "right";
            return "";
        }

        /// <summary>
        /// 生成最终JSON字符串（纯实体类序列化，全版本兼容）
        /// </summary>
        public static string BuildLevelJson(EditorLevelData levelData)
        {
            ExportLevelRoot root = new ExportLevelRoot();
            root.levelId = levelData.levelId;
            root.levelName = levelData.levelName;
            root.gridRows = levelData.gridRows;
            root.gridCols = levelData.gridCols;
            root.pointSpacing = levelData.pointSpacing;

            root.arrows = new List<ExportArrowItem>();
            foreach (var editorArr in levelData.arrows)
            {
                ExportArrowItem item = new ExportArrowItem();
                item.id = editorArr.arrowId;
                item.startPoint = editorArr.startPoint;
                item.endPoint = editorArr.endPoint;
                item.color = editorArr.colorHex;
                item.path = new List<string>(editorArr.pathDirs);
                root.arrows.Add(item);
            }

            return JsonUtility.ToJson(root, prettyPrint: true);
        }

        /// <summary>
        /// 保存JSON到StreamingAssets
        /// </summary>
        public static bool SaveToStreamingAssets(string json, string fileName = "level_1001.json")
        {
            string folder = Application.streamingAssetsPath;
            if (!Directory.Exists(folder))
                Directory.CreateDirectory(folder);

            string fullPath = Path.Combine(folder, fileName);
            File.WriteAllText(fullPath, json);
            Debug.Log($"[导出成功] {fullPath}");
            return true;
        }
    }
}