using System;
using System.Collections.Generic;
using System.IO;
using unvell.ReoGrid;

namespace WpfApp.Utils
{
    /// <summary>
    /// Excel 操作静态工具类（基于 ReoGrid）
    /// </summary>
    public static class ExcelHelper
    {
        private static ReoGridControl reoGridControl;
        private static Worksheet currentSheet;

        static ExcelHelper()
        {
            reoGridControl = new ReoGridControl();
        }

        /// <summary>
        /// 从模板加载 Excel 文件
        /// </summary>
        public static void LoadTemplate(string filePath)
        {
            if (!File.Exists(filePath))
                throw new FileNotFoundException($"模板文件不存在: {filePath}");

            reoGridControl.Load(filePath);
            currentSheet = reoGridControl.CurrentWorksheet;
        }

        /// <summary>
        /// 切换到指定工作表
        /// </summary>
        public static void SelectSheet(string sheetName)
        {
            if (reoGridControl == null)
                throw new InvalidOperationException("请先调用 LoadTemplate 方法加载文件。");

            var sheet = reoGridControl.Worksheets[sheetName];
            if (sheet == null)
                throw new ArgumentException($"未找到名为 '{sheetName}' 的工作表。");

            currentSheet = sheet;
            reoGridControl.CurrentWorksheet = sheet;
        }

        /// <summary>
        /// 获取当前工作表名称
        /// </summary>
        public static string GetCurrentSheetName()
        {
            return currentSheet?.Name ?? string.Empty;
        }

        /// <summary>
        /// 读取单元格
        /// </summary>
        public static object ReadCell(string cellName)
        {
            return currentSheet?.GetCellData(cellName);
        }

        /// <summary>
        /// 设置单元格值
        /// </summary>
        public static void WriteCell(string cellName, object value)
        {
            currentSheet?.SetCellData(cellName, value);
        }

        /// <summary>
        /// 批量写入单元格
        /// </summary>
        public static void WriteCells(Dictionary<string, object> cellValues)
        {
            foreach (var kv in cellValues)
            {
                currentSheet?.SetCellData(kv.Key, kv.Value);
            }
        }

        /// <summary>
        /// 在指定行插入数据（从 startColumn 开始）
        /// </summary>
        public static void InsertRowData(int rowIndex, int startColumn, IList<object> values)
        {
            if (currentSheet == null)
                throw new InvalidOperationException("请先加载模板并选择工作表。");

            for (int i = 0; i < values.Count; i++)
            {
                currentSheet[rowIndex, startColumn + i] = values[i];
            }
        }

        /// <summary>
        /// 保存为新文件
        /// </summary>
        public static void SaveAs(string savePath)
        {
            if (reoGridControl == null)
                throw new InvalidOperationException("请先调用 LoadTemplate 方法加载文件。");

            reoGridControl.Save(savePath, unvell.ReoGrid.IO.FileFormat.Excel2007);
        }

        /// <summary>
        /// 打开 Excel 文件（并显示到 ReoGrid 控件）
        /// </summary>
        /// <param name="filePath">Excel 文件路径</param>
        /// <param name="reoGridHost">用于显示的 ReoGridControl 容器</param>
        public static void OpenExcel(string filePath, ReoGridControl reoGridHost)
        {
            if (!File.Exists(filePath))
                throw new FileNotFoundException($"文件不存在: {filePath}");

            // 替换当前控件引用
            reoGridControl?.Dispose();
            reoGridControl = reoGridHost;

            // 加载 Excel 文件
            reoGridControl.Load(filePath);

            // 默认显示第一个工作表
            currentSheet = reoGridControl.CurrentWorksheet;
        }


        /// <summary>
        /// 清理资源
        /// </summary>
        public static void Dispose()
        {
            reoGridControl?.Dispose();
            reoGridControl = null;
            currentSheet = null;
        }
    }
}