using Bytescout.Spreadsheet;
using System.Globalization;

namespace Diligent.WebAPI.Business.Services
{
    public class SaveImportedDataService : ISaveImportedDataService
    {
        private readonly ILogger<SaveImportedDataService> _logger;
        private readonly IAdService _adService;

        public SaveImportedDataService(ILogger<SaveImportedDataService> logger, IAdService adService)
        {
            _logger = logger;
            _adService = adService;
        }
        public async Task<List<ApplicantImportDto>> Save()
        {
            List<ApplicantImportDto> applicants = new List<ApplicantImportDto>();
            try
            {
                _logger.LogInformation("Unoirtubg data from file...");
                var path = Path.Combine(Directory.GetCurrentDirectory(), "Files", "s.xlsx");
                Spreadsheet document = new Spreadsheet();
                document.LoadFromFile(path);
                _logger.LogInformation("File is opened successfully");
                var worksheetsNumber = document.Workbook.Worksheets.Count;
                _logger.LogInformation($"File contains {worksheetsNumber} sheets");
                for (int k = 0; k < worksheetsNumber; k++)
                {
                    var worksheets = document.Workbook.Worksheets[k];
                    var position = worksheets.Name;
                    _logger.LogInformation($"Import data for Ad {position}");
                    var ad = await _adService.ImportAsync(new AdCreateDto
                    {
                        Title = position,
                        TechnologiesIds = new(),
                        MinimumExperience = 0,
                        WorkHour = "FullTime",
                        Requirements = "",
                        Offer = "",
                        KeyResponsibilities = "",
                        EmploymentType = position.Contains("praksa") ? "Intership" : "Work",
                        CreatedAt = DateTime.Now,
                        ExpiredAt = DateTime.Now
                    });

                    int i = 2;
                    while (true)
                    {
                        if (String.IsNullOrEmpty(worksheets.Cell(i, 0).ToString()))
                            break;
                        var name = worksheets.Cell(i, 0).ToString().Split(' ');
                        var a = new ApplicantImportDto
                        {
                            FirstName = name[0],
                            LastName = name[1],
                            Email = worksheets.Cell(i, 1).ToString(),
                            CV = worksheets.Cell(i, 2).ToString(),
                            ApplicationChannel = worksheets.Cell(i, 6).ToString(),
                            Comment = worksheets.Cell(i, 7).ToString(),
                            Position = position,
                            Ad = ad,
                            TypeOfEmployment = position.Contains("praksa") ? "Praksa" : "Posao"
                        };
                        _logger.LogInformation($"Loaded user {a.FirstName} {a.LastName}");
                        try
                        {
                            string str = worksheets.Cell(i, 3).ToString();
                            if(!string.IsNullOrEmpty(str))
                            a.DateOfApplication = DateTime.ParseExact(str, "dd.MM.yyyy.", CultureInfo.InvariantCulture);

                        }
                        catch (Exception ex)
                        {
                            _logger.LogError("Incorect date time for this candidate");
                        }
                        applicants.Add(a);
                        _logger.LogInformation("Candidate added successfully in the list");
                        i++;
                    }
                }
            }
            catch (Exception e)
            {
                _logger.LogError(e.Message);
                throw new FileNotFoundException("File is not uploaded!");
            }
            return applicants;
        }
    }
}