using System.Net.Http.Headers;
using BMA.EHR.Organization.Service.Extensions;
using BMA.EHR.Profile.Service.Controllers;
using BMA.EHR.Recruit.Service.Services;
using BMA.EHR.Report.Service.Data;
using BMA.EHR.Report.Service.Responses;
using Microsoft.AspNetCore.Mvc;
using iText.Kernel.Font;
using iText.Kernel.Pdf;
using iText.Layout.Element;
using iText.Layout.Properties;
using iText.Layout;
using iText.IO.Font;
using System.IO;
using System.Threading.Tasks;
using System;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using Swashbuckle.AspNetCore.Annotations;
using Telerik.Reporting;
using Telerik.Reporting.Processing;

namespace BMA.EHR.Report.Service.Controllers
{
    [Route("api/v{version:apiVersion}/report/recruit")]
    [ApiVersion("1.0")]
    [ApiController]
    [Produces("application/json")]
    [Authorize]
    [SwaggerTag("รายงานข้อมูลการสอบแข่งขัน")]
    public class RecruitReportController : BaseController
    {
        #region " Fields "

        private readonly ApplicationDbContext _context;
        private readonly IWebHostEnvironment _hostingEnvironment;
        private readonly IConfiguration _configuration;
        private readonly string space = "ㅤ";
        private readonly RecruitService _recruitService;
        private readonly IHttpContextAccessor _httpContextAccessor;

        #endregion

        #region " Constructor and Destructor "

        public RecruitReportController(ApplicationDbContext context,
                                       IWebHostEnvironment hostingEnvironment,
                                       IConfiguration configuration,
                                        IHttpContextAccessor httpContextAccessor,
                                       RecruitService recruitService)
        {
            this._context = context;
            this._hostingEnvironment = hostingEnvironment;
            this._configuration = configuration;
            this._recruitService = recruitService;
            this._httpContextAccessor = httpContextAccessor;
        }

        private string? token => _httpContextAccessor.HttpContext.Request.Headers["Authorization"];
        #endregion

        #region " Methods "

        /// <summary>
        /// แสดงหนังสือรับรอง
        /// </summary>
        /// <param name="id">รหัสรอบการสอบ</param>
        /// <param name="examId">เลขประจำตัวผู้สมัครสอบ</param>
        /// <param name="type">ชนิดของรายงาน</param>
        /// <returns></returns>
        /// <response code="200">เมื่อแสดงรายงานสำเร็จ</response>
        /// <response code="400">ค่าตัวแปรที่ส่งมาไม่ถูกต้อง</response>
        /// <response code="401">ไม่ได้ Login เข้าระบบ</response>
        /// <response code="500">เมื่อเกิดข้อผิดพลาดในการทำงาน</response>

        [HttpGet("certificate/{type:int}/{id:length(36)}/{examId}")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [ProducesResponseType(StatusCodes.Status401Unauthorized)]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        public async Task<ActionResult<ResponseObject>> GetCertificateReportAsync(Guid id, string examId, int type)
        {
            try
            {
                var _data = await _context.Recruits.AsQueryable()
                                    .Include(x => x.RecruitImport)
                                    .Where(x => x.RecruitImport.Id == id)
                                    .Where(x => x.ExamId == examId)
                                    .FirstOrDefaultAsync();
                if (_data == null)
                    return Error("ไม่พบข้อมูลในระบบ");

                // if (_data.AuthName == null || _data.AuthName == "")
                // {
                //     var apiUrl = $"{_configuration["API"]}/org/find/head/officer";
                //     using (var client = new HttpClient())
                //     {
                //         client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token.Replace("Bearer ", ""));
                //         client.DefaultRequestHeaders.Add("api_key", _configuration["API_KEY"]);
                //         var _req = new HttpRequestMessage(HttpMethod.Get, apiUrl);
                //         var _res = await client.SendAsync(_req);
                //         var _result = await _res.Content.ReadAsStringAsync();
                //         if (_res.IsSuccessStatusCode)
                //         {
                //             var org = JsonConvert.DeserializeObject<dynamic>(_result);
                //             _data.AuthName = org.result.name == null ? "" : org.result.name;
                //             _data.AuthPosition = org.result.position == null ? "" : org.result.position;
                //             await _context.SaveChangesAsync();
                //         }
                //     }
                // }

                var data = await _context.Recruits.AsQueryable()
                                    .Include(x => x.RecruitImport)
                                    .Where(x => x.RecruitImport.Id == id)
                                    .Where(x => x.ExamId == examId)
                                    .Join(_context.RecruitScores.AsQueryable()
                                            .Include(x => x.ScoreImport),
                                            rc => new { rc.RecruitImport.Year, rc.ExamId },
                                            sc => new { sc.ScoreImport.Year, sc.ExamId },
                                            (p, sr) => new
                                            {
                                                ExamID = p.ExamId,
                                                p.CitizenId,
                                                Order = p.RecruitImport.Order,
                                                Year = p.RecruitImport.Year.ToThaiYear(),
                                                FullName = $"{p.Prefix}{p.FirstName} {p.LastName}",
                                                ExamResult = sr == null ? "" : sr.ExamStatus,
                                                EndDate = p.RecruitImport.RegisterEndDate == null ? "-" : p.RecruitImport.RegisterEndDate.Value.ToThaiFullDate3(),
                                                AuthName = p.RecruitImport.AuthName,
                                                AuthPosition = p.RecruitImport.AuthPosition
                                            })
                                    .FirstOrDefaultAsync();
                if (data == null)
                    return Error("ไม่พบข้อมูลในระบบ");

                var rptFile = Path.Combine(_hostingEnvironment.ContentRootPath, "Report", "Recruit", $"rptCertificate{type}.trdp");
                ReportPackager reportPackager = new ReportPackager();
                Telerik.Reporting.Report report = null;
                using (var sourceStream = System.IO.File.OpenRead(rptFile))
                {
                    report = (Telerik.Reporting.Report)reportPackager.UnpackageDocument(sourceStream);
                }

                report.DataSource = data;
                System.Collections.Hashtable deviceInfo = new System.Collections.Hashtable();

                InstanceReportSource instanceReportSource = new InstanceReportSource()
                {
                    ReportDocument = report
                };


                ReportProcessor reportProcessor = new ReportProcessor(_configuration);
                RenderingResult result = reportProcessor.RenderReport("PDF", instanceReportSource, deviceInfo);

                var content = result.DocumentBytes;
                return File(content, "application/pdf", $"หนังสือรับรอง_{data.CitizenId}_{data.FullName}.pdf");

            }
            catch (Exception ex)
            {
                return Error(ex, "เกิดข้อผิดพลาดในการแสดงรายงาน");
            }
        }

        /// <summary>
        /// แสดงเอกสารผลสอบ
        /// </summary>
        /// <param name="id">รหัสรอบการสอบ</param>
        /// <param name="examId">เลขประจำตัวผู้สมัครสอบ</param>
        /// <returns></returns>
        /// <response code="200">เมื่อแสดงรายงานสำเร็จ</response>
        /// <response code="400">ค่าตัวแปรที่ส่งมาไม่ถูกต้อง</response>
        /// <response code="401">ไม่ได้ Login เข้าระบบ</response>
        /// <response code="500">เมื่อเกิดข้อผิดพลาดในการทำงาน</response>
        [HttpGet("score/{id:length(36)}/{examId}")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [ProducesResponseType(StatusCodes.Status401Unauthorized)]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        public async Task<ActionResult<ResponseObject>> GetScoreReportAsync(Guid id, string examId)
        {
            try
            {
                var data = await _context.Recruits.AsQueryable()
                                    .Include(x => x.RecruitImport)
                                    .Include(x => x.Documents)
                                    .ThenInclude(x => x.DocumentFile)
                                    .Where(x => x.RecruitImport.Id == id)
                                    .Where(x => x.ExamId == examId)
                                    .Join(_context.RecruitScores.AsQueryable()
                                            .Include(x => x.ScoreImport),
                                            rc => new { rc.RecruitImport.Year, rc.ExamId },
                                            sc => new { sc.ScoreImport.Year, sc.ExamId },
                                            (p, sr) => new
                                            {
                                                ExamId = p.ExamId,
                                                CitizenId = p.CitizenId,
                                                p.Prefix,
                                                FullName = $"{p.Prefix}{p.FirstName} {p.LastName}",
                                                DateOfBirth = p.DateOfBirth.HasValue && p.DateOfBirth.Value != DateTime.MinValue
                                                    ? p.DateOfBirth.Value.ToThaiShortDate()
                                                    : "",
                                                Gender = p.Gendor,
                                                Degree = p.Educations.First().Degree,
                                                Major = p.Educations.First().Major,

                                                ExamResult = sr == null ? "" : sr.ExamStatus,

                                                University = p.Educations.First().University,
                                                PositionName = p.PositionName,
                                                ExamName = $"{p.RecruitImport.Name} ครั้งที่ {p.RecruitImport.Order}/{p.RecruitImport.Year.ToThaiYear()}",


                                                Number = sr == null ? "" : sr.Number,
                                                ExamCount = _recruitService.GetExamCount(p.CitizenId),
                                                ScoreExpire = p.RecruitImport.AnnouncementDate == null ? "" : p.RecruitImport.AnnouncementDate.Value.AddYears(2).ToThaiShortDate(),


                                                FullA = sr == null ? 0.0 : sr.FullA,
                                                SumA = sr == null ? 0.0 : sr.SumA,
                                                //FullB = sr == null ? 0.0 : sr.FullB,
                                                //SumB = sr == null ? 0.0 : sr.SumB,
                                                FullC = sr == null ? 0.0 : sr.FullC,
                                                SumC = sr == null ? 0.0 : sr.SumC,



                                            })
                                    .FirstOrDefaultAsync();

                var rptFile = Path.Combine(_hostingEnvironment.ContentRootPath, "Report", "Recruit", $"rptExamResult.trdp");
                ReportPackager reportPackager = new ReportPackager();
                Telerik.Reporting.Report report = null;
                using (var sourceStream = System.IO.File.OpenRead(rptFile))
                {
                    report = (Telerik.Reporting.Report)reportPackager.UnpackageDocument(sourceStream);
                }

                report.DataSource = data;
                System.Collections.Hashtable deviceInfo = new System.Collections.Hashtable();

                InstanceReportSource instanceReportSource = new InstanceReportSource()
                {
                    ReportDocument = report
                };


                ReportProcessor reportProcessor = new ReportProcessor(_configuration);
                RenderingResult result = reportProcessor.RenderReport("PDF", instanceReportSource, deviceInfo);

                var content = result.DocumentBytes;
                return File(content, "application/pdf", $"ผลคะแนนสอบ_{data.CitizenId}_{data.FullName}.pdf");
            }
            catch (Exception ex)
            {
                return Error(ex, "เกิดข้อผิดพลาดในการแสดงรายงาน");
            }
        }


        [HttpGet("candidate/{id:length(36)}")]
        [AllowAnonymous]
        public async Task<ActionResult<ResponseObject>> GetCandidateListReportAsync(Guid id)
        {
            try
            {
                var data = await _context.Recruits.AsQueryable()
                    .Include(x => x.RecruitImport)
                    .Include(x => x.Documents)
                    .ThenInclude(x => x.DocumentFile)
                    .Where(x => x.RecruitImport.Id == id)
                    .OrderBy(x => x.ExamId)
                    .Select(p => new
                    {
                        ExamId = p.ExamId != null ? p.ExamId.ToThaiNumber() : string.Empty,
                        FullName = $"{p.Prefix}{p.FirstName} {p.LastName}",
                        PositionName = p.PositionName,
                        ExamName =
                            $"ครั้งที่ {(p.RecruitImport != null ? p.RecruitImport.Order.ToString().ToThaiNumber() : "")}/{(p.RecruitImport != null ? p.RecruitImport.Year.ToThaiYear().ToString().ToThaiNumber() : "")}",
                    }).ToListAsync();

                if (data.Count == 0) return Error("ไม่พบข้อมูลในระบบ");

                //var rptFile = Path.Combine(_hostingEnvironment.ContentRootPath, "Report", "Recruit", $"rptCandidateList.trdp");
                //ReportPackager reportPackager = new ReportPackager();
                //Telerik.Reporting.Report report = null;
                //using (var sourceStream = System.IO.File.OpenRead(rptFile))
                //{
                //    report = (Telerik.Reporting.Report)reportPackager.UnpackageDocument(sourceStream);
                //}

                ////report.DataSource = data;
                //report.ReportParameters["ExamName"].Value = data[0].ExamName.ToThaiNumber();
                //var tbl = (Telerik.Reporting.Table)report.Items["detailSection1"].Items["table1"];
                //tbl.DataSource = data;
                //System.Collections.Hashtable deviceInfo = new System.Collections.Hashtable();

                //InstanceReportSource instanceReportSource = new InstanceReportSource()
                //{
                //    ReportDocument = report
                //};


                //ReportProcessor reportProcessor = new ReportProcessor(_configuration);
                //RenderingResult result = reportProcessor.RenderReport("PDF", instanceReportSource, deviceInfo);

                //var content = result.DocumentBytes;
                //return File(content, "application/pdf", $"รายชื่อผู้มีสิทธิ์สอบ_{data.First().ExamName}.pdf");
                var examName = data[0].ExamName;
                var _data = new
                {
                    template = "rptCandidateList",
                    reportName = $"รายชื่อผู้มีสิทธิ์สอบ_{data.First().ExamName}",
                    data = new
                    {
                        examName = examName,
                        data = data
                    }
                };
                return Success(_data);

            }
            catch (Exception ex)
            {
                return Error(ex);
            }
        }

        /// <summary>
        /// รายชื่อผู้มีสิทธิ์สอบ แสดงรายชื่อแบ่งตามตำแหน่ง (สอบแข่งขัน)
        /// </summary>
        /// <param name="id">รหัสรอบการสอบ</param>
        /// <returns></returns>
        /// <response code="200">เมื่อแสดงรายงานสำเร็จ</response>
        /// <response code="400">ค่าตัวแปรที่ส่งมาไม่ถูกต้อง</response>
        /// <response code="401">ไม่ได้ Login เข้าระบบ</response>
        /// <response code="500">เมื่อเกิดข้อผิดพลาดในการทำงาน</response>
        [HttpGet("candidate-new/{id:length(36)}")]
        [AllowAnonymous]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [ProducesResponseType(StatusCodes.Status401Unauthorized)]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        public async Task<ActionResult<ResponseObject>> GetCandidateNewListReportAsync(Guid id)
        {
            try
            {
                var data = await _context.Recruits.AsQueryable()
                    .Include(x => x.RecruitImport)
                    .Where(x => x.RecruitImport.Id == id)
                    .OrderBy(x => x.ExamId)
                    .Select(p => new
                    {
                        FullName = $"{p.Prefix}{p.FirstName} {p.LastName}",
                        PositionName = p.PositionName,
                        Remark = !string.IsNullOrEmpty(p.Remark) ? p.Remark.ToThaiNumber() : "",
                        ExamId = !string.IsNullOrEmpty(p.ExamId) ? p.ExamId.ToThaiNumber() : "",
                        ExamName =
                            $"ครั้งที่ {(p.RecruitImport != null ? p.RecruitImport.Order.ToString().ToThaiNumber() : "")}/{(p.RecruitImport != null ? p.RecruitImport.Year.ToThaiYear().ToString().ToThaiNumber() : "")}",
                    }).ToListAsync();

                if (data.Count == 0)
                    return Error("ไม่พบข้อมูลในระบบ");

                var examName = data.First().ExamName;

                var groupData = data
                    .GroupBy(x => x.PositionName)
                    .Select(g => new
                    {
                        PositionName = $"ตำแหน่ง {g.Key}",
                        Total = $"จำนวน {g.Count().ToString().ToThaiNumber()} ราย",
                        Persons = g.Select((x, index) => new
                        {
                            No = (index + 1).ToString().ToThaiNumber(),
                            ExamId = x.ExamId,
                            FullName = x.FullName,
                            Remark = x.Remark
                        }).ToList()
                    })
                    .ToList();

                // เตรียม MemoryStream
                using (var stream = new MemoryStream())
                {
                    // สร้าง PDF document
                    using (var writer = new PdfWriter(stream))
                    using (var pdf = new PdfDocument(writer))
                    using (var document = new Document(pdf, iText.Kernel.Geom.PageSize.A4))
                    {
                        // กำหนดฟ้อนต์ TH-Sarabun
                        var fontPath = System.IO.Path.Combine(Environment.CurrentDirectory, "Fonts", "THSarabun.ttf");
                        var font = PdfFontFactory.CreateFont(fontPath, "Identity-H");
                        document.SetFont(font).SetFontSize(16);

                        // ตั้งค่าระยะขอบ top, right, bottom, left
                        document.SetMargins(30, 15, 20, 15);

                        // Title
                        var title = new Paragraph(
                            $"รายชื่อผู้ชำระค่าธรรมเนียมการสมัครสอบการแข่งขันเพื่อบรรจุและแต่งตั้งบุคคลเข้ารับราชการเป็นข้าราชการกรุงเทพมหานครสามัญ {examName ?? ""}"
                        )
                        .SetBold()
                        .SetMultipliedLeading(1.0f)
                        .SetTextAlignment(TextAlignment.CENTER);

                        document.Add(title);
                        float[] columnWidths = { 10f, 20f, 45f, 25f };
                        // Loop Groups
                        foreach (var group in groupData)
                        {
                            // Group Header (ตำแหน่ง)
                            Paragraph positionHeader = new Paragraph($"{group.PositionName} {group.Total}")
                                .SetBold()
                                .SetMultipliedLeading(1.0f)
                                .SetTextAlignment(TextAlignment.CENTER)
                                .SetMarginBottom(5);

                            document.Add(positionHeader);

                            var table = new iText.Layout.Element.Table(UnitValue.CreatePercentArray(columnWidths)).UseAllAvailableWidth();

                            // Table Header
                            string[] headers = { "ลำดับที่", "เลขประจำตัวสอบ", "ชื่อ-สกุล", "หมายเหตุ" };
                            foreach (var h in headers)
                            {
                                table.AddHeaderCell(new Cell()
                                    .Add(new Paragraph(h).SetMultipliedLeading(1.0f))
                                    .SetBold()
                                    .SetTextAlignment(TextAlignment.CENTER));
                            }

                            // Table Details
                            foreach (var x in group.Persons)
                            {
                                table.AddCell(new Cell().Add(new Paragraph(x.No ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.CENTER));
                                table.AddCell(new Cell().Add(new Paragraph(x.ExamId ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.CENTER));
                                table.AddCell(new Cell().Add(new Paragraph(x.FullName ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.LEFT));
                                table.AddCell(new Cell().Add(new Paragraph(x.Remark ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.CENTER));
                            }
                            document.Add(table);
                            // เว้นระหว่าง groups
                            document.Add(new Paragraph("").SetMarginBottom(15));
                        }
                    }
                    return File(stream.ToArray(), "application/pdf", $"รายชื่อผู้มีสิทธิ์สอบ_{examName}");
                }
            }
            catch (Exception ex)
            {
                return Error(ex);
            }
        }

        [HttpGet("pass/{id:length(36)}")]
        [AllowAnonymous]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [ProducesResponseType(StatusCodes.Status401Unauthorized)]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        public async Task<ActionResult<ResponseObject>> GetPassExamListReportAsync(Guid id)
        {
            try
            {
                var data = await _context.Recruits.AsQueryable() 
                                    .Include(x => x.RecruitImport)
                                    .ThenInclude(x => x.ScoreImport)
                                    .Include(x => x.Documents)
                                    .ThenInclude(x => x.DocumentFile)
                                    .Join(_context.RecruitScores.AsQueryable()
                                            .Include(x => x.ScoreImport)
                                            .Where(x => x.ScoreImport.RecruitImportId == id)
                                            .Where(x => x.ExamStatus == "ผ่าน"),
                                            rc => new { id = rc.RecruitImport.Id, examId = rc.ExamId },
                                            sc => new { id = sc.ScoreImport.RecruitImportId, examId = sc.ExamId },
                                            (p, sr) => new
                                            {
                                                Id = p.RecruitImport.Id,
                                                ExamId = p.ExamId != null ? p.ExamId.ToThaiNumber() : string.Empty,
                                                FullName = $"{p.Prefix}{p.FirstName} {p.LastName}",
                                                ExamResult = sr == null ? "" : sr.ExamStatus,
                                                ExamName = p.RecruitImport.Order == null
                                                     ? ""
                                                     : $"{p.RecruitImport.Name} ครั้งที่ {p.RecruitImport.Order.ToString().ToThaiNumber()}/{p.RecruitImport.Year.ToThaiYear().ToString().ToThaiNumber()}",
                                                Number = sr == null || sr.Number == null ? 0 : Convert.ToInt32(sr.Number),
    
                                                SumScore = sr == null
                                                    ? "๐"
                                                    : (((sr.SumA > 0 ? sr.SumA : 0) + (sr.SumB > 0 ? sr.SumB : 0) + (sr.SumC > 0 ? sr.SumC : 0)).ToString()).ToThaiNumber(),
                                            })
                                    .OrderBy(x => x.Number)
                                    .Where(x => x.Id == id)
                                    .Where(x => x.ExamResult == "ผ่าน")
                                    .ToListAsync();

                if (data.Count == 0)
                    return Error("ไม่พบข้อมูลในระบบ");

                var data_ = data.Select(x => new
                {
                    x.ExamName,
                    Number = x.Number.ToString().ToThaiNumber(),
                    x.ExamId,
                    x.FullName,
                    x.SumScore
                }).ToList();

                var examName = data[0].ExamName;
                var _data = new
                {
                    template = "rptPassExamList",
                    reportName = $"รายชื่อผู้สอบแข่งขันได้_{data.First().ExamName}",
                    data = new
                    {
                        examName = examName,
                        data = data_
                    }
                };
                return Success(_data);
            }
            catch (Exception ex)
            {
                return Error(ex, "เกิดข้อผิดพลาดในการแสดงรายงาน");
            }
        }

        /// <summary>
        /// รายชื่อผู้สอบแข่งขันได้ แสดงรายชื่อแบ่งตามตำแหน่ง (สอบแข่งขัน)
        /// </summary>
        /// <param name="id">รหัสรอบการสอบ</param>
        /// <returns></returns>
        /// <response code="200">เมื่อแสดงรายงานสำเร็จ</response>
        /// <response code="400">ค่าตัวแปรที่ส่งมาไม่ถูกต้อง</response>
        /// <response code="401">ไม่ได้ Login เข้าระบบ</response>
        /// <response code="500">เมื่อเกิดข้อผิดพลาดในการทำงาน</response>
        [HttpGet("pass-new/{id:length(36)}")]
        [AllowAnonymous]
        [ProducesResponseType(StatusCodes.Status200OK)]
        [ProducesResponseType(StatusCodes.Status400BadRequest)]
        [ProducesResponseType(StatusCodes.Status401Unauthorized)]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        public async Task<ActionResult<ResponseObject>> GetPassExamNewListReportAsync(Guid id)
        {
            try
            {
                var data = await _context.Recruits.AsQueryable()
                                    .Include(x => x.RecruitImport)
                                    .ThenInclude(x => x.ScoreImport)
                                    .Join(_context.RecruitScores.AsQueryable()
                                            .Include(x => x.ScoreImport)
                                            .Where(x => x.ScoreImport.RecruitImportId == id)
                                            .Where(x => x.ExamStatus == "ผ่าน"),
                                            rc => new { id = rc.RecruitImport.Id, examId = rc.ExamId },
                                            sc => new { id = sc.ScoreImport.RecruitImportId, examId = sc.ExamId },
                                            (p, sr) => new
                                            {
                                                PositionName = p.PositionName,
                                                FullName = $"{p.Prefix}{p.FirstName} {p.LastName}",
                                                ExamResult = sr == null ? "" : sr.ExamStatus,
                                                ExamName = p.RecruitImport.Order == null
                                                     ? ""
                                                     : $"{p.RecruitImport.Name} ครั้งที่ {p.RecruitImport.Order.ToString().ToThaiNumber()}/{p.RecruitImport.Year.ToThaiYear().ToString().ToThaiNumber()}",
                                                Number = sr == null || sr.Number == null ? 0 : Convert.ToInt32(sr.Number),
                                                SumScore = sr == null
                                                    ? "๐"
                                                    : (((decimal)(sr.SumA > 0 ? sr.SumA : 0) + (sr.SumB > 0 ? sr.SumB : 0) + (sr.SumC > 0 ? sr.SumC : 0)).ToString("0.00")).ToThaiNumber(),
                                            })
                                    .OrderBy(x => x.Number)
                                    .Where(x => x.ExamResult == "ผ่าน")
                                    .ToListAsync();

                if (data.Count == 0)
                    return Error("ไม่พบข้อมูลในระบบ");

                var examName = data.First().ExamName;

                // Group by PositionName
                var groupData = data
                    .GroupBy(g => g.PositionName)
                    .Select(g => new
                    {
                        PositionName = $"ตำแหน่ง {g.Key}",
                        Total = $"จำนวน {g.Count().ToString().ToThaiNumber()} ราย",
                        Persons = g.Select((x) => new
                        {
                            Number = x.Number > 0 ? x.Number.ToString().ToThaiNumber() : "",
                            FullName = x.FullName,
                            SumScore = x.SumScore
                        }).ToList()
                    })
                    .ToList();

                using (var stream = new MemoryStream())
                {
                    using (var writer = new PdfWriter(stream))
                    using (var pdf = new PdfDocument(writer))
                    using (var document = new Document(pdf, iText.Kernel.Geom.PageSize.A4))
                    {
                        var fontPath = System.IO.Path.Combine(Environment.CurrentDirectory, "Fonts", "THSarabun.ttf");
                        var font = PdfFontFactory.CreateFont(fontPath, "Identity-H");

                        document.SetFont(font).SetFontSize(16);
                        document.SetMargins(30, 15, 20, 15);

                        var title = new Paragraph($"รายชื่อผู้สอบแข่งขันได้\n{examName}")
                            .SetMultipliedLeading(1.0f)
                            .SetBold()
                            .SetTextAlignment(TextAlignment.CENTER);

                        document.Add(title);
                        float[] columnWidths = { 10f, 20f, 45f, 25f };
                        foreach (var g in groupData)
                        {
                            // Header per group
                            Paragraph positionHeader = new Paragraph($"{g.PositionName} {g.Total}")
                                .SetMultipliedLeading(1.0f)
                                .SetTextAlignment(TextAlignment.CENTER)
                                .SetBold()
                                .SetMarginBottom(5);

                            document.Add(positionHeader);

                            var table = new iText.Layout.Element.Table(UnitValue.CreatePercentArray(columnWidths)).UseAllAvailableWidth();

                            string[] headers = { "ลำดับที่", "สนามสอบ", "ชื่อ - นามสกุล", "คะแนนสอบ" };
                            foreach (var h in headers)
                            {
                                table.AddHeaderCell(new Cell()
                                    .Add(new Paragraph(h).SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.CENTER)
                                    .SetBold());
                            }

                            foreach (var p in g.Persons)
                            {
                                table.AddCell(new Cell().Add(new Paragraph(p.Number ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.CENTER));
                                table.AddCell(new Cell());
                                table.AddCell(new Cell().Add(new Paragraph(p.FullName ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.LEFT));
                                table.AddCell(new Cell().Add(new Paragraph(p.SumScore ?? "").SetMultipliedLeading(1.0f))
                                    .SetTextAlignment(TextAlignment.CENTER));
                            }

                            document.Add(table);
                            document.Add(new Paragraph("").SetMarginBottom(15));
                        }
                    }
                    return File(stream.ToArray(), "application/pdf", $"รายชื่อผู้สอบแข่งขันได้_{examName}");
                }
            }
            catch (Exception ex)
            {
                return Error(ex, "เกิดข้อผิดพลาดในการแสดงรายงาน");
            }
        }

        #endregion
    }
}