using System;
using System.IO;
using OfficeOpenXml;
using UnityEditor;
using UnityEngine;
using Debug = UnityEngine.Debug;

namespace DesignTools.Scene
{
    /// <summary>
    /// 最大场景配置工具
    /// 读取 Docs/config/Constant.xlsx 的 ConstantInt Sheet，仅编辑 MaxAreaId 的 ConstantValue。
    /// </summary>
    public class MaxAreaIdEditor : BaseDesignToolEditor
    {
        private const string CONSTANT_EXCEL_NAME = "Constant.xlsx";
        private const string CONSTANT_INT_SHEET_NAME = "ConstantInt";
        private const int HEADER_ROW = 1;
        private const int DATA_START_ROW = 3;
        private const string TARGET_CONSTANT_KEY = "MaxAreaId";

        private ConstantIntEntry maxAreaIdEntry;
        private int keyColumnIndex = -1;
        private int valueColumnIndex = -1;

        [MenuItem("策划工具/场景/最大场景")]
        public static void ShowWindow()
        {
            MaxAreaIdEditor window = GetWindow<MaxAreaIdEditor>("最大场景");
            window.minSize = window.GetMinWindowSize();
            window.Show();
        }

        protected override string GetDocsPathPrefKey()
        {
            return "MaxAreaIdEditor_DocsPath";
        }

        protected override string GetWindowTitle()
        {
            return "最大场景工具";
        }

        protected override Vector2 GetMinWindowSize()
        {
            return new Vector2(640, 320);
        }

        protected override void LoadConfigData()
        {
            LoadConstantIntSheet();
        }

        protected override void DrawDataEditor()
        {
            EditorGUILayout.BeginVertical("box");
            EditorGUILayout.HelpBox("此工具只会读取并写回 Constant.xlsx 的 ConstantInt Sheet 中 ConstantKey=MaxAreaId 这一条数据。", MessageType.Info);
            EditorGUILayout.EndVertical();

            EditorGUILayout.Space(6);

            if (maxAreaIdEntry == null)
            {
                EditorGUILayout.HelpBox("未找到 MaxAreaId 配置。", MessageType.Warning);
                return;
            }

            EditorGUILayout.BeginVertical("box");
            EditorGUILayout.LabelField("配置项", EditorStyles.boldLabel);
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.LabelField("ConstantKey", GUILayout.Width(100));
            EditorGUILayout.SelectableLabel(maxAreaIdEntry.ConstantKey, EditorStyles.textField, GUILayout.Height(EditorGUIUtility.singleLineHeight));
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.Space(4);
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.LabelField("ConstantValue", GUILayout.Width(100));
            maxAreaIdEntry.ConstantValue = EditorGUILayout.IntField(maxAreaIdEntry.ConstantValue, GUILayout.Width(180));
            GUILayout.FlexibleSpace();
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.Space(4);
            EditorGUILayout.LabelField($"Excel 行号：{maxAreaIdEntry.RowIndex}", EditorStyles.miniLabel);
            EditorGUILayout.EndVertical();
        }

        protected override void SaveDataToExcel()
        {
            SaveConstantIntSheet();
        }

        private void LoadConstantIntSheet()
        {
            maxAreaIdEntry = null;
            keyColumnIndex = -1;
            valueColumnIndex = -1;

            string excelPath = GetDocsConfigFilePath(CONSTANT_EXCEL_NAME);
            if (!File.Exists(excelPath))
            {
                throw new FileNotFoundException($"未找到 {CONSTANT_EXCEL_NAME}", excelPath);
            }

            using (ExcelPackage package = new ExcelPackage(new FileInfo(excelPath)))
            {
                ExcelWorksheet worksheet = package.Workbook.Worksheets[CONSTANT_INT_SHEET_NAME];
                if (worksheet == null)
                {
                    throw new Exception($"{CONSTANT_EXCEL_NAME} 中未找到 Sheet: {CONSTANT_INT_SHEET_NAME}");
                }

                if (worksheet.Dimension == null)
                {
                    throw new Exception($"{CONSTANT_EXCEL_NAME}/{CONSTANT_INT_SHEET_NAME} 没有可读取的数据");
                }

                keyColumnIndex = FindColumnIndex(worksheet, "ConstantKey");
                valueColumnIndex = FindColumnIndex(worksheet, "ConstantValue");

                if (keyColumnIndex < 0 || valueColumnIndex < 0)
                {
                    throw new Exception($"{CONSTANT_EXCEL_NAME}/{CONSTANT_INT_SHEET_NAME} 表结构不正确，缺少 ConstantKey 或 ConstantValue 列");
                }

                int rowCount = worksheet.Dimension.End.Row;
                for (int row = DATA_START_ROW; row <= rowCount; row++)
                {
                    string constantKey = worksheet.Cells[row, keyColumnIndex].Text.Trim();
                    if (string.IsNullOrEmpty(constantKey) || constantKey != TARGET_CONSTANT_KEY)
                    {
                        continue;
                    }

                    string valueText = worksheet.Cells[row, valueColumnIndex].Text.Trim();
                    if (!int.TryParse(valueText, out int constantValue))
                    {
                        throw new Exception($"{CONSTANT_INT_SHEET_NAME} Sheet 第 {row} 行 MaxAreaId 的 ConstantValue 不是有效整数：{valueText}");
                    }

                    maxAreaIdEntry = new ConstantIntEntry
                    {
                        ConstantKey = constantKey,
                        ConstantValue = constantValue,
                        RowIndex = row
                    };
                    break;
                }
            }

            if (maxAreaIdEntry == null)
            {
                throw new Exception($"{CONSTANT_INT_SHEET_NAME} Sheet 中未找到 ConstantKey={TARGET_CONSTANT_KEY} 的配置");
            }

            Debug.Log($"最大场景配置读取完成，当前 {TARGET_CONSTANT_KEY}={maxAreaIdEntry.ConstantValue}");
        }

        private void SaveConstantIntSheet()
        {
            if (maxAreaIdEntry == null)
            {
                EditorUtility.DisplayDialog("提示", "当前没有可保存的数据，请先加载配置。", "确定");
                return;
            }

            string excelPath = GetDocsConfigFilePath(CONSTANT_EXCEL_NAME);
            if (!File.Exists(excelPath))
            {
                EditorUtility.DisplayDialog("错误", $"未找到文件：{excelPath}", "确定");
                return;
            }

            try
            {
                using (ExcelPackage package = new ExcelPackage(new FileInfo(excelPath)))
                {
                    ExcelWorksheet worksheet = package.Workbook.Worksheets[CONSTANT_INT_SHEET_NAME];
                    if (worksheet == null)
                    {
                        EditorUtility.DisplayDialog("错误", $"未找到 Sheet: {CONSTANT_INT_SHEET_NAME}", "确定");
                        return;
                    }

                    worksheet.Cells[maxAreaIdEntry.RowIndex, valueColumnIndex].Value = maxAreaIdEntry.ConstantValue;
                    package.Save();
                }

                EditorUtility.DisplayDialog("成功", $"{TARGET_CONSTANT_KEY} 已保存到 Excel！", "确定");
                Debug.Log($"最大场景配置保存成功，{TARGET_CONSTANT_KEY}={maxAreaIdEntry.ConstantValue}");
            }
            catch (Exception e)
            {
                EditorUtility.DisplayDialog("错误", $"保存失败: {e.Message}", "确定");
                Debug.LogError($"保存最大场景配置失败: {e}");
            }
        }

        private int FindColumnIndex(ExcelWorksheet worksheet, string columnName)
        {
            int columnCount = worksheet.Dimension?.End.Column ?? 0;
            for (int col = 1; col <= columnCount; col++)
            {
                if (string.Equals(worksheet.Cells[HEADER_ROW, col].Text.Trim(), columnName, StringComparison.OrdinalIgnoreCase))
                {
                    return col;
                }
            }

            return -1;
        }

        [Serializable]
        private class ConstantIntEntry
        {
            public string ConstantKey;
            public int ConstantValue;
            public int RowIndex;
        }
    }
}