using System.Net;
using System.Net.Mail;
using Microsoft.AspNetCore.Mvc;
using Syncfusion.Drawing;
using Syncfusion.XlsIO;
using SytelineSaAppEfDataModel.Dtos;
using SytelineSaAppEfDataModel.Services;

namespace FaKrosnoApi.Controllers;

[ApiController]
[Route("api/[controller]")]
public class ExcelGeneratorController(IWzHeaderService wzHeaderService, IMaterialTransactionService materialTransactionService, IConfiguration configuration) : Controller
{
    [HttpGet("generate-meyle")]
    public async Task GeneratePackListForMeyle(Guid packListId)
    {
        WzHeaderDto wzHeader = await wzHeaderService.GetById(packListId);
        MaterialTransactionDto? materialTransaction = await materialTransactionService.GetByWzNumber(wzHeader.WzRowsMeyle.First().WzNumber);

        using ExcelEngine excelEngine = new ExcelEngine();
        IApplication application = excelEngine.Excel;
        application.DefaultVersion = ExcelVersion.Xlsx;

        IWorkbook workbook = application.Workbooks.Create(1);
        IWorksheet worksheet = workbook.Worksheets[0];
        
        IStyle boldFontStyle = workbook.Styles.Add("BoldFontStyle");
        boldFontStyle.Font.Bold = true;
        
        var mainHeaders = new List<string>
            { "Numer zamówienia Meyle", "Meyle Numer", "Ilość w dostawie", "Numer Palety", "Nr Wz", "Nr Partii" };

        worksheet["B1"].Value = "Packing List";
        worksheet["B1"].CellStyle = boldFontStyle;
        
        worksheet["B3"].Value = "Supplier Name";
        worksheet["B3"].CellStyle = boldFontStyle;
        
        worksheet["D3"].Value = "FA KROSNO";
        worksheet["D3"].CellStyle = boldFontStyle;
        
        worksheet["B4"].Value = "Packing List nr";
        worksheet["B4"].CellStyle = boldFontStyle;
        
        worksheet["B6"].Value = "Related delivery note";
        worksheet["B6"].CellStyle = boldFontStyle;

        worksheet["D6"].Value = string.Join(", ", wzHeader.WzRowsMeyle.Select(x => x.WzNumber).Distinct());
        worksheet["D6"].CellStyle = boldFontStyle;
        
        worksheet["B9"].Value = "Forwarder";
        worksheet["B9"].CellStyle = boldFontStyle;
        
        worksheet["B10"].Value = "Date";
        worksheet["B10"].CellStyle = boldFontStyle;

        worksheet["D10"].DateTime = materialTransaction?.CreateDate ?? DateTime.Now;
        
        int currentRow = 12;
        
        for (int i = 0; i < mainHeaders.Count; i++)
        {
            string columnLetter = GetColumnLetter(i);
            worksheet.Range[$"{columnLetter}{currentRow}"].Text = mainHeaders[i];
            worksheet.Range[$"{columnLetter}{currentRow}"].CellStyle = boldFontStyle;
        }

        currentRow++;
        
        foreach (var wzRow in wzHeader.WzRowsMeyle)
        {
            worksheet.Range[$"A{currentRow}"].Text = wzRow.OrderNumber;
            worksheet.Range[$"B{currentRow}"].Text = wzRow.ItemNumber;
            worksheet.Range[$"C{currentRow}"].Number = (double)wzRow.Quantity!;
            worksheet.Range[$"D{currentRow}"].Number = (double)wzRow.PalletNumber!;
            worksheet.Range[$"E{currentRow}"].Text = wzRow.WzNumber;
            worksheet.Range[$"F{currentRow}"].Text = wzRow.PartNumber;

            currentRow++;
        }

        for (int i = 0; i < 6; i++)
        {
            worksheet.AutofitColumn(i + 1);
        }

        using MemoryStream stream = new MemoryStream();
        workbook.SaveAs(stream);
        stream.Position = 0;

        SendEmail(stream, wzHeader);
    }
    
    private static string GetColumnLetter(int columnIndex)
    {
        string columnName = string.Empty;
        while (columnIndex >= 0)
        {
            columnName = (char)('A' + (columnIndex % 26)) + columnName;
            columnIndex = (columnIndex / 26) - 1;
        }

        return columnName;
    }
    
    private void SendEmail(MemoryStream stream, WzHeaderDto wzHeader)
    {
        IConfigurationSection smtpSettings = configuration.GetSection("EmailSettings");
        string smtpHost = smtpSettings["SmtpServer"] ?? string.Empty;
        int smtpPort = int.Parse(smtpSettings["Port"] ?? "0");
        string smtpUsername = smtpSettings["SenderEmail"] ?? string.Empty;
        string smtpPassword = smtpSettings["SenderPassword"] ?? string.Empty;
        string fromEmail = smtpSettings["SenderEmail"] ?? string.Empty;
        List<string> toEmail = wzHeader.EmailAddresses?.Split(',')?.ToList() ??
                               (smtpSettings["RecipientEmail"] ?? string.Empty).Split(',').ToList();
        string subject = "MEYLE: Packing List";
        string body =
            $"W załączeniu znajduje się Packing List dla klienta MEYLE wygenerowany {DateTime.Now:dd.MM.yyyy HH:mm:ss}";

        using var mailMessage = new MailMessage();
        mailMessage.From = new MailAddress(fromEmail);
        mailMessage.Subject = subject;
        mailMessage.Body = body;
        mailMessage.IsBodyHtml = false;

        mailMessage.Attachments.Add(new Attachment(stream, $"PackingList_Meyle_{DateTime.Now:yyyyMMddHHmmss}.xlsx",
            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"));

        toEmail.ForEach(x => mailMessage.To.Add(x));

        using var smtpClient = new SmtpClient(smtpHost, smtpPort);
        smtpClient.EnableSsl = true;
        smtpClient.Credentials = new NetworkCredential(smtpUsername, smtpPassword);
        smtpClient.Send(mailMessage);
    }
}