using MiniExcelLibs;

using System.IO;


namespace ShrlAlgoToolkit.RevitAddins.Common.Extensions
{
    public static class MiniExcelExtensions
    {
        // --- 写入部分 (Write) ---

        /// <summary>
        /// 开始流式配置 Excel 写入
        /// </summary>
        public static Extensions.ExcelWriter<T> AsExcel<T>(this IEnumerable<T> data)
        {
            return new Extensions.ExcelWriter<T>(data);
        }

        /// <summary>
        /// 快速保存多 Sheet 字典到文件
        /// </summary>
        public static void SaveAsExcel(this Dictionary<string, object> sheetsData, string filePath, bool overwrite = true)
        {
            // 自动清理 Sheet 名称中的非法字符
            var sanitizedData = new Dictionary<string, object>();
            foreach (var kvp in sheetsData)
            {
                sanitizedData.Add(SanitizeSheetName(kvp.Key), kvp.Value);
            }
            MiniExcel.SaveAs(filePath, sanitizedData, overwriteFile: overwrite);
        }

        // --- 读取部分 (Read) ---

        /// <summary>
        /// 从文件路径直接读取数据为强类型列表
        /// </summary>
        public static IEnumerable<T> ReadExcel<T>(this string filePath, string sheetName = null) where T : class, new()
        {
            if (!File.Exists(filePath)) throw new FileNotFoundException("Excel文件不存在", filePath);
            return MiniExcel.Query<T>(filePath, sheetName: sheetName);
        }

        /// <summary>
        /// 从文件路径读取为动态类型 (Dictionary/dynamic)
        /// </summary>
        public static IEnumerable<dynamic> ReadExcelDynamic(this string filePath, string sheetName = null)
        {
            if (!File.Exists(filePath)) throw new FileNotFoundException("Excel文件不存在", filePath);
            return MiniExcel.Query(filePath, sheetName: sheetName);
        }

        // --- 工具方法 ---

        /// <summary>
        /// 清理 Excel Sheet 名称中的非法字符
        /// </summary>
        public static string SanitizeSheetName(string name)
        {
            if (string.IsNullOrEmpty(name)) return "Sheet1";
            char[] invalidChars = { '\\', '/', '?', '*', '[', ']', ':' };
            foreach (var c in invalidChars) name = name.Replace(c, '_');
            return name.Length > 31 ? name.Substring(0, 31) : name;
        }
    }

    public class ExcelWriter<T>
    {
        private readonly IEnumerable<T> data;
        private string sheetName = "Sheet1";
        private bool overwrite = true;

        public ExcelWriter(IEnumerable<T> data) => this.data = data;

        /// <summary>
        /// 设置 Sheet 名称
        /// </summary>
        public Extensions.ExcelWriter<T> WithSheetName(string name)
        {
            sheetName = Extensions.MiniExcelExtensions.SanitizeSheetName(name);
            return this;
        }

        /// <summary>
        /// 设置是否覆盖
        /// </summary>
        public Extensions.ExcelWriter<T> Overwrite(bool canOverwrite = true)
        {
            overwrite = canOverwrite;
            return this;
        }

        /// <summary>
        /// 执行保存到文件
        /// </summary>
        public void SaveTo(string filePath)
        {
            MiniExcel.SaveAs(filePath, data, sheetName: sheetName, overwriteFile: overwrite);
        }

        /// <summary>
        /// 转换为字节数组 (用于 Web 下载或内存操作)
        /// </summary>
        public byte[] ToBytes()
        {
            using (var ms = new MemoryStream())
            {
                ms.SaveAs(data, sheetName: sheetName);
                return ms.ToArray();
            }
        }
    }
}