using NPOI.SS.UserModel;
using NPOI.Util;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using WebLib;

namespace 報到系統
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    [ScriptService]
    public class ClassesService : System.Web.Services.WebService
    {
        /// <summary>
        /// 搜尋活動
        /// </summary>
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public BaseResponse SearchClasses(int pageIndex, int pageSize, string courseCode, string courseName, DateTime? courseDate1, DateTime? courseDate2, string courseLocation, bool? closed, string projectID)
        {
            try
            {
                // 計算起始索引 (pageIndex 從 1 開始)
                int startRowIndex = (pageIndex - 1) * pageSize;

                // 判斷是否所有條件都為空
                bool noInput = string.IsNullOrEmpty(courseCode) &&
                               string.IsNullOrEmpty(courseName) &&
                               !courseDate1.HasValue &&
                               !courseDate2.HasValue &&
                               string.IsNullOrEmpty(courseLocation);

                using (var conn = DAC.NewConnection())
                {
                    DAC_Classes daoClasses = new DAC_Classes(conn);
                    //DAC_SignUp daoSignUp = new DAC_SignUp(conn);
                    DAC_BPAA daoBpaa = new DAC_BPAA(conn);

                    // 查詢資料
                    ClassesList result = daoClasses.SelectPage(
                        noInputReturnAll: true,
                        startRowIndex: startRowIndex,
                        maximumRows: pageSize,
                        CourseCode: courseCode,
                        CourseName: courseName,
                        CourseDate_1: courseDate1,
                        CourseDate_2: courseDate2,
                        CourseLocation: courseLocation,
                        Closed: closed,
                        ProjectID: projectID,
                        orderBy: "CourseDate DESC, CourseCode ASC"
                    );

                    // 取得總筆數
                    int totalCount = daoClasses.SelectCount(
                        noInputReturnAll: true,
                        CourseCode: courseCode,
                        CourseName: courseName,
                        CourseDate_1: courseDate1,
                        CourseDate_2: courseDate2,
                        CourseLocation: courseLocation,
                        Closed: closed,
                        ProjectID: projectID,
                        orderBy: ""
                    );

                    foreach (var item in result)
                    {
                        // 填入關聯欄位與統計欄位
                        item.ProjectName = daoBpaa.SelectProjectName(item.ProjectID);
                        // TODO: 這些等用戶提出再加上
                        //var thisCourdeSignUps = daoSignUp.Select(false, item.ID, null, null, null, null);
                        //item.Actual = thisCourdeSignUps.Count(x => x.IsPresent);
                        //item.Expected = thisCourdeSignUps.Count(x => !x.IsOnSite);
                        //item.Absent = thisCourdeSignUps.Count(x => !x.IsOnSite && x.IsPresent);
                        //item.Exception = thisCourdeSignUps.Count(x => x.IsException);
                        //item.OnSite = thisCourdeSignUps.Count(x => x.IsOnSite);
                    }

                    return new BaseResponse
                    {
                        Success = true,
                        Message = "查詢成功",
                        Data = result?.ToDict() ?? new ClassesList().ToDict(),
                        TotalCount = totalCount
                    };
                }
            }
            catch (Exception ex)
            {
                return new BaseResponse
                {
                    Success = false,
                    Message = "查詢活動發生錯誤：" + ex.Message,
                    Data = new ClassesList(),
                    TotalCount = 0
                };
            }
        }

        /// <summary>
        /// 儲存活動 (新增或更正)
        /// </summary>
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public BaseResponse SaveClasses(bool isNew, ClassesItem item)
        {
            try
            {
                if (item == null)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "參數不完整"
                    };
                }

                // 驗證必填欄位
                if (string.IsNullOrEmpty(item.CourseName))
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "課程名稱為必填欄位"
                    };
                }

                if (item.CourseName.Length > 100)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "課程名稱最長 100 個字元"
                    };
                }

                if (item.CourseDate == DateTime.MinValue)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "課程日期為必填欄位"
                    };
                }

                if (!string.IsNullOrEmpty(item.NotificationTitle) && item.NotificationTitle.Length > 100)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "通知標題最長 100 個字元"
                    };
                }

                if (!string.IsNullOrEmpty(item.NotificationTemplate) && item.NotificationTemplate.Length > 500)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "通知模板最長 500 個字元"
                    };
                }

                DAC_Classes dac = new DAC_Classes();

                if (isNew)
                {
                    // 新增
                    ClassesItem newItem = dac.InsertOne(item);
                    return new BaseResponse
                    {
                        Success = true,
                        Message = "新增成功",
                        Data = newItem
                    };
                }
                else
                {
                    // 更正
                    ClassesItem updatedItem = dac.UpdateOne(item);
                    return new BaseResponse
                    {
                        Success = true,
                        Message = "更新成功",
                        Data = updatedItem
                    };
                }
            }
            catch (Exception ex)
            {
                return new BaseResponse
                {
                    Success = false,
                    Message = "儲存活動發生錯誤：" + ex.Message
                };
            }
        }

        /// <summary>
        /// 刪除活動
        /// </summary>
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public BaseResponse DeleteClasses(int id, int dbAppNo)
        {
            try
            {
                if (id <= 0)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "參數不完整"
                    };
                }

                DAC_Classes dac = new DAC_Classes();
                int rowsAffected = dac.DeleteOne(id, dbAppNo);

                if (rowsAffected > 0)
                {
                    return new BaseResponse
                    {
                        Success = true,
                        Message = "刪除成功"
                    };
                }
                else
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "找不到要刪除的資料或資料已被修改"
                    };
                }
            }
            catch (Exception ex)
            {
                return new BaseResponse
                {
                    Success = false,
                    Message = "刪除活動發生錯誤：" + ex.Message
                };
            }
        }

        /// <summary>
        /// 搜尋專案 - 用於自動完成
        /// </summary>
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public BaseResponse SearchProjects(string keyword)
        {
            try
            {
                DAC_BPAA dac = new DAC_BPAA();
                var result = dac.Select(keyword);

                return new BaseResponse
                {
                    Success = true,
                    Message = "搜尋成功",
                    Data = result ?? new NameValueList()
                };
            }
            catch (Exception ex)
            {
                return new BaseResponse
                {
                    Success = false,
                    Message = "搜尋專案發生錯誤：" + ex.Message,
                    Data = new NameValueList()
                };
            }
        }

        /// <summary>
        /// 匯出學員簽到表 - 使用 NPOI 生成 Excel 檔案並回傳 Base64
        /// </summary>
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public BaseResponse ExportClassesReport(int classesID, string timeFormat = "datetime")
        {
            try
            {
                if (classesID <= 0)
                {
                    return new BaseResponse
                    {
                        Success = false,
                        Message = "課程編號為必填欄位"
                    };
                }

                using (var conn = DAC.NewConnection())
                {
                    DAC_Classes dacClasses = new DAC_Classes(conn);
                    DAC_SignUp dacSignUp = new DAC_SignUp(conn);
                    DAC_BPAA dacBpaa = new DAC_BPAA(conn);

                    // 查詢課程資訊
                    ClassesList classes = dacClasses.SelectOne(classesID);
                    if (classes.Count == 0)
                    {
                        return new BaseResponse
                        {
                            Success = false,
                            Message = "找不到課程資訊"
                        };
                    }

                    ClassesItem classItem = classes[0];
                    classItem.ProjectName = dacBpaa.SelectProjectName(classItem.ProjectID);

                    // 查詢該課程的參加人員
                    SignUpList signups = dacSignUp.Select(
                        noInputReturnAll: true,
                        CourseID: classesID,
                        SeqNo: null,
                        Name: null,
                        Mobile: null,
                        QRCode: null,
                        orderBy: "ID ASC"
                    );

                    var 實到人數 = signups.Count(x => x.IsPresent);
                    var 應到人數 = signups.Count(x => !x.IsOnSite );
                    var 缺席人數 = signups.Count(x => !x.IsOnSite && !x.IsPresent);
                    var 異常人數 = signups.Count(x => x.IsException);
                    var 現場報名 = signups.Count(x => x.IsOnSite);

                    // 使用 NPOI 建立 Excel 檔案
                    Excel excel = new Excel();
                    IWorkbook workbook = new XSSFWorkbook();
                    ISheet sheet = workbook.CreateSheet("學員簽到表");
                    excel.WorkBook = workbook;
                    excel.Sheet = sheet;

                    // 建立字體和樣式
                    IFont titleFont = excel.NewFont(null, 12, true);
                    IFont headerFont = excel.NewFont(null, 10, true);
                    IFont bodyFont = excel.NewFont(null, 10, false);

                    ICellStyle titleStyle = excel.NewCellStyle(titleFont, HorizontalAlignment.Center, VerticalAlignment.Center, true);
                    ICellStyle headerStyleCenter = excel.NewCellStyle(headerFont, HorizontalAlignment.Center, VerticalAlignment.Center, true);
                    ICellStyle headerStyleLeft = excel.NewCellStyle(headerFont, HorizontalAlignment.Left, VerticalAlignment.Center, true);
                    ICellStyle dataStyle = excel.NewCellStyle(bodyFont, HorizontalAlignment.Left, VerticalAlignment.Center, true);
                    ICellStyle dataStyleCenter = excel.NewCellStyle(bodyFont, HorizontalAlignment.Center, VerticalAlignment.Center, true);
                    ICellStyle dataStyleRight = excel.NewCellStyle(bodyFont, HorizontalAlignment.Right, VerticalAlignment.Center, true);

                    int rowIndex = 0;

                    // 表頭
                    excel.MergeCell(rowIndex, 0, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 0, classItem.ProjectName, titleStyle);
                    excel.SetRowHeightInPoints(rowIndex, 15);
                    rowIndex++;

                    excel.MergeCell(rowIndex, 0, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 0, "學員簽到表", headerStyleCenter);
                    excel.SetRowHeightInPoints(rowIndex, 15);
                    rowIndex++;

                    // 課程時間
                    excel.MergeCell(rowIndex, 0, rowIndex, 1);
                    excel.SetCellValue(rowIndex, 0, "課程時間", headerStyleCenter);
                    excel.MergeCell(rowIndex, 2, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 2, string.Format(PublicVariable.TaiwanCulture, "{0:yyyy年MM月dd日} {1}-{2}", classItem.CourseDate, classItem.StartTime, classItem.EndTime), headerStyleLeft);
                    rowIndex++;

                    // 授課講師
                    excel.MergeCell(rowIndex, 0, rowIndex, 1);
                    excel.SetCellValue(rowIndex, 0, "授課講師", headerStyleCenter);
                    excel.MergeCell(rowIndex, 2, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 2, classItem.Teacher, headerStyleLeft);
                    rowIndex++;

                    // 課程地點
                    excel.MergeCell(rowIndex, 0, rowIndex, 1);
                    excel.SetCellValue(rowIndex, 0, "課程地點", headerStyleCenter);
                    excel.MergeCell(rowIndex, 2, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 2, classItem.CourseLocation, headerStyleLeft);
                    rowIndex++;

                    // 課程名稱
                    excel.MergeCell(rowIndex, 0, rowIndex, 1);
                    excel.SetCellValue(rowIndex, 0, "課程名稱", headerStyleCenter);
                    excel.MergeCell(rowIndex, 2, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 2, classItem.CourseName, headerStyleLeft);
                    rowIndex++;

                    // 到課人數
                    excel.MergeCell(rowIndex, 0, rowIndex, 1);
                    excel.SetCellValue(rowIndex, 0, "到課人數", headerStyleCenter);
                    excel.MergeCell(rowIndex, 2, rowIndex, 10);
                    excel.SetCellValue(rowIndex, 2,
                        string.Format("實到人數：{0} 人 ＝ 應到人數：{1} 人 － 缺席人數：{2} 人 ＋ 現場報名：{3} 人 ／ (異常人數：{4} 人)",
                            實到人數, 應到人數, 缺席人數, 現場報名, 異常人數),
                        headerStyleLeft);
                    rowIndex++;

                    // 參加人員表頭
                    excel.SetCellValue(rowIndex, 0, "序號", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 1, "學員姓名", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 2, "手機號碼", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 3, "身分證字號", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 4, "性別", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 5, "認定次數", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 6, "用餐別", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 7, "報名方式", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 8, "簽到時間", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 9, "簽退時間", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 10, "出席狀況", headerStyleCenter);
                    rowIndex++;

                    // 參加人員資料
                    foreach (var signup in signups)
                    {
                        excel.SetCellValue(rowIndex, 0, signup.SeqNo, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 1, signup.Name, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 2, signup.Mobile, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 3, string.IsNullOrEmpty(signup.IDNumber) ? "-未填寫-" : signup.IDNumber, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 4, string.IsNullOrEmpty(signup.Gender) ? "-未填寫-" : signup.Gender, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 5, signup.LossJobTimes.HasValue ? signup.LossJobTimes.ToString() : "-未填寫-", dataStyleCenter);
                        excel.SetCellValue(rowIndex, 6, string.IsNullOrEmpty(signup.MealType) ? "-未填寫-" : signup.MealType, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 7, string.IsNullOrEmpty(signup.SignUpType) ? "預約" : signup.SignUpType, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 8, Utils.FormatTimeValue(signup.CheckInTime, timeFormat), dataStyleCenter);
                        excel.SetCellValue(rowIndex, 9, Utils.FormatTimeValue(signup.CheckOutTime, timeFormat), dataStyleCenter);
                        excel.SetCellValue(rowIndex, 10, signup.IsException ? "異常" : (signup.IsPresent ? "" : "缺席"), dataStyleCenter);
                        rowIndex++;
                    }

                    // 設定欄寬
                    excel.SetColumnWidthInChars(0, 6);
                    excel.SetColumnWidthInChars(1, 15);
                    excel.SetColumnWidthInChars(2, 15);
                    excel.SetColumnWidthInChars(3, 15);
                    excel.SetColumnWidthInChars(4, 8);
                    excel.SetColumnWidthInChars(5, 8);
                    excel.SetColumnWidthInChars(6, 8);
                    excel.SetColumnWidthInChars(7, 10);
                    excel.SetColumnWidthInChars(8, timeFormat == "datetime" ? 20 : 10);
                    excel.SetColumnWidthInChars(9, timeFormat == "datetime" ? 20 : 10);
                    excel.SetColumnWidthInChars(10, 8);

                    // 儲存到記憶體流並轉換為 Base64
                    MemoryStream ms = new MemoryStream();
                    workbook.Write(ms);

                    byte[] fileBytes = ms.ToArray();
                    string fileBase64 = Convert.ToBase64String(fileBytes);
                    string fileName = $"{classItem.CourseName}_{DateTime.Now:yyyyMMdd}.xlsx";

                    return new BaseResponse
                    {
                        Success = true,
                        Message = "匯出成功",
                        Data = new
                        {
                            FileName = fileName,
                            FileBase64 = fileBase64,
                            FileSize = fileBytes.Length,
                            DataCount = signups.Count
                        }
                    };
                }
            }
            catch (Exception ex)
            {
                return new BaseResponse
                {
                    Success = false,
                    Message = "匯出課程報表發生錯誤：" + ex.Message
                };
            }
        }

        /// <summary>
        /// 匯出課程清單 - 使用 NPOI 生成 Excel 檔案並回傳 Base64
        /// </summary>
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public BaseResponse ExportClassesList(DateTime? courseDate1, DateTime? courseDate2, string projectID)
        {
            try
            {
                // 判斷是否所有條件都為空
                bool noInput = !courseDate1.HasValue &&
                               !courseDate2.HasValue &&                               
                               string.IsNullOrEmpty(projectID);

                using (var conn = DAC.NewConnection())
                {
                    DAC_Classes dac = new DAC_Classes(conn);
                    DAC_BPAA dacBpaa = new DAC_BPAA(conn);
                    DAC_SignUp dacSignUp = new DAC_SignUp(conn);

                    var projectName = !string.IsNullOrEmpty(projectID) ? dacBpaa.SelectProjectName(projectID) : "全部";

                    // 查詢課程資料
                    ClassesList result = dac.SelectPage(
                        noInputReturnAll: true,
                        startRowIndex: 0,
                        maximumRows: Int32.MaxValue,
                        CourseCode: null,
                        CourseName: null,
                        CourseDate_1: courseDate1,
                        CourseDate_2: courseDate2,
                        CourseLocation: null,
                        Closed: null,
                        ProjectID: projectID,
                        orderBy: "ProjectID ASC, CourseDate DESC"
                    );

                    if (result.Count == 0)
                    {
                        return new BaseResponse
                        {
                            Success = false,
                            Message = "沒有符合條件的資料",
                            Data = null
                        };
                    }

                    var reportData = new List<ClassesReportItem>();
                    foreach (var item in result)
                    {
                        // 查詢課程的參加人員
                        SignUpList signups = dacSignUp.Select(
                            noInputReturnAll: true,
                            CourseID: item.ID,
                            SeqNo: null,
                            Name: null,
                            Mobile: null,
                            QRCode: null
                        );

                        reportData.Add(new ClassesReportItem
                        {
                            CourseName = item.CourseName,
                            CourseLocation = item.CourseLocation,
                            Teacher = item.Teacher,
                            實到人數 = signups.Count(x => x.IsPresent),
                            應到人數 = signups.Count(x => x.SignUpType != "現場"),
                            缺席人數 = signups.Count(x => x.SignUpType != "現場" && !x.IsPresent),
                            現場報名 = signups.Count(x => x.SignUpType == "現場")
                        });
                    }

                    // 使用 NPOI 建立 Excel 檔案
                    Excel excel = new Excel();
                    IWorkbook workbook = new XSSFWorkbook();
                    ISheet sheet = workbook.CreateSheet("課程匯出");
                    excel.WorkBook = workbook;
                    excel.Sheet = sheet;

                    // 建立字體和樣式
                    IFont titleFont = excel.NewFont(null, 12, true);
                    IFont headerFont = excel.NewFont(null, 10, true);
                    IFont bodyFont = excel.NewFont(null, 10, false);

                    ICellStyle titleStyle = excel.NewCellStyle(titleFont, HorizontalAlignment.Center, VerticalAlignment.Center, true);
                    ICellStyle headerStyleCenter = excel.NewCellStyle(headerFont, HorizontalAlignment.Center, VerticalAlignment.Center, true);
                    ICellStyle headerStyleLeft = excel.NewCellStyle(headerFont, HorizontalAlignment.Left, VerticalAlignment.Center, true);
                    ICellStyle dataStyle = excel.NewCellStyle(bodyFont, HorizontalAlignment.Left, VerticalAlignment.Center, true);
                    ICellStyle dataStyleCenter = excel.NewCellStyle(bodyFont, HorizontalAlignment.Center, VerticalAlignment.Center, true);
                    ICellStyle dataStyleRight = excel.NewCellStyle(bodyFont, HorizontalAlignment.Right, VerticalAlignment.Center, true);

                    int rowIndex = 0;

                    // 表頭
                    excel.MergeCell(rowIndex, 0, rowIndex, 6);
                    excel.SetCellValue(rowIndex, 0, "課程匯出", headerStyleCenter);
                    excel.SetRowHeightInPoints(rowIndex, 15);
                    rowIndex++;

                    // 計畫
                    excel.SetCellValue(rowIndex, 0, "計畫", headerStyleCenter);
                    excel.MergeCell(rowIndex, 1, rowIndex, 6);
                    excel.SetCellValue(rowIndex, 1, projectName, headerStyleLeft);
                    rowIndex++;

                    // 課程日期
                    excel.SetCellValue(rowIndex, 0, "課程日期", headerStyleCenter);
                    excel.MergeCell(rowIndex, 1, rowIndex, 6);
                    excel.SetCellValue(rowIndex, 1, string.Format("{0:yyyy-MM-dd} - {1:yyyy-MM-dd}", courseDate1, courseDate2), headerStyleLeft);
                    rowIndex++;

                    // 參加人員表頭
                    excel.SetCellValue(rowIndex, 0, "課程名稱", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 1, "課程地點", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 2, "授課講師", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 3, "實到人數", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 4, "應到人數", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 5, "缺席人數", headerStyleCenter);
                    excel.SetCellValue(rowIndex, 6, "現場報名", headerStyleCenter);
                    rowIndex++;

                    // 參加人員資料
                    foreach (var reportItem in reportData)
                    {
                        excel.SetCellValue(rowIndex, 0, reportItem.CourseName, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 1, reportItem.CourseLocation, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 2, reportItem.Teacher, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 3, reportItem.實到人數, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 4, reportItem.應到人數, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 5, reportItem.缺席人數, dataStyleCenter);
                        excel.SetCellValue(rowIndex, 6, reportItem.現場報名, dataStyleCenter);
                        rowIndex++;
                    }

                    // 設定欄寬
                    excel.SetColumnWidthInChars(0, 40);
                    excel.SetColumnWidthInChars(1, 40);
                    excel.SetColumnWidthInChars(2, 20);
                    excel.SetColumnWidthInChars(3, 12);
                    excel.SetColumnWidthInChars(4, 12);
                    excel.SetColumnWidthInChars(5, 12);
                    excel.SetColumnWidthInChars(6, 12);

                    // 儲存到記憶體流並轉換為 Base64
                    MemoryStream ms = new MemoryStream();
                    workbook.Write(ms);

                    byte[] fileBytes = ms.ToArray();
                    string fileBase64 = Convert.ToBase64String(fileBytes);
                    string fileName = $"課程匯出_{DateTime.Now:yyyyMMdd}.xlsx";

                    return new BaseResponse
                    {
                        Success = true,
                        Message = "匯出成功",
                        Data = new
                        {
                            FileName = fileName,
                            FileBase64 = fileBase64,
                            FileSize = fileBytes.Length
                        }
                    };
                }
            }
            catch (Exception ex)
            {
                return new BaseResponse
                {
                    Success = false,
                    Message = "匯出課程報表發生錯誤：" + ex.Message
                };
            }
        }

        /// <summary>
        /// 課程報表項目
        /// </summary>
        private class ClassesReportItem
        {
            public string CourseName { get; set; }
            public string CourseLocation { get; set; }
            public string Teacher { get; set; }
            public int 實到人數 { get; set; }
            public int 應到人數 { get; set; }
            public int 缺席人數 { get; set; }
            public int 現場報名 { get; set; }
        }
    }
}