using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;
using EveryThing.Data;
using EveryThing.Models;
using EveryThing.Models.Invoice;
using EveryThing.Models.Transport;
using DocumentFormat.OpenXml.Wordprocessing;
using System.ComponentModel.DataAnnotations;

namespace EveryThing.Pages.Invoices
{
    [Authorize(Roles = "Administrator,InvoicingUser,ProjecThingUser")]
    public class PrintModel : PageModel
    {
        public class PrintTranslation
        {
            public string Email { get; set; } = "E-pošta";
            public string Telephone { get; set; } = "Tel.";
            public string IdTax { get; set; } = "ID za DDV";
            public string Iban { get; set; } = "IBAN";
            public string SwiftBic { get; set; } = "SWIFT/BIC";
            public string InvoiceType { get; set; } = "Faktura";
            public string Number { get; set; } = "št.";
            public string Date { get; set; } = "Datum";
            public string OrderNumber { get; set; } = "Številka naročila";
            public string DeliveryNote { get; set; } = "Številka dobavnice:";
            public string DeliveryTime { get; set; } = "Dobavni rok";
            public string DateOfDispatch { get; set; } = "Datum odpreme";
            public string Article { get; set; } = "Artikel";
            public string Quantity { get; set; } = "Količina";
            public string Price { get; set; } = "Cena";
            public string Amount { get; set; } = "Znesek";
            public string Dimensions { get; set; } = "Dimenzije";
            public string Total { get; set; } = "Skupaj";
            public string Director { get; set; } = "Direktor";
            public string Project { get; set; } = "Projekt";
            public string Issued { get; set; } = "Izdal:";
            public string Received { get; set; } = "Prejel:";
        }

        public enum PrintTranslationLanguage
        {
            [Display(Name = "Slovensko")]
            Slovenian = 1,
            [Display(Name = "Nemško")]
            German = 2
        }

        private readonly ApplicationDbContext _context;
        private readonly UserManager<IdentityApplicationUser> _userManager;
        private readonly IConfiguration _configuration;
        private readonly IWebHostEnvironment _environment;

        public Models.Invoice.Invoice Invoice { get; set; }
        public PrintTranslation Translation { get; set; }
        public IList<Models.Invoice.InvoiceItem> InvoiceItems { get; set; }
        public string ProjectNumber { get; set; }

        public PrintModel(ApplicationDbContext context, UserManager<IdentityApplicationUser> userManager, IConfiguration configuration, IWebHostEnvironment environment)
        {
            _context = context;
            _userManager = userManager;
            _configuration = configuration;
            _environment = environment;
        }

        public async Task<IActionResult> OnGetAsync(int id, int? printTranslationLanguage)
        {
            var user = _userManager.GetUserAsync(User).Result;

            Invoice = await _context.Invoices
                .Include(x => x.Company)
                .Include(x => x.Company.Country)
                .Include(x => x.Partner)
                .Include(x => x.Partner.Country)
                .FirstOrDefaultAsync(x => x.IdInvoice == id && x.IdCompanyFk == user.IdCompanyFk);

            if (Invoice != null)
            {
                InvoiceItems = await _context.InvoiceItems
                    .Where(x => x.IdInvoiceFk == Invoice.IdInvoice)
                    .Include(x => x.Item)
                    .Include(x => x.InvoiceItemJoin)
                        .ThenInclude(x => x.Invoice)
                    .ToListAsync();


                var translationLanguage = PrintTranslationLanguage.Slovenian;
                if (printTranslationLanguage != null)
                    translationLanguage = (PrintTranslationLanguage)printTranslationLanguage;

                SetTranslation(translationLanguage, Invoice.State);

                var showProjects = User.IsInRole("ProjecThingUser") || User.IsInRole("Administrator");

                if (showProjects)
                {
                    var project = _context.InvoiceItems
                        .Include(x => x.ProjectPartItem)
                            .ThenInclude(x => x.ProjectPart)
                                .ThenInclude(x => x.Project).FirstOrDefault(x => x.IdInvoiceFk == Invoice.IdInvoice);
                    if (project != null && project.ProjectPartItem != null)
                        ProjectNumber = project.ProjectPartItem.ProjectPart.Project.ProjectNumberFormatted;
                }

                return Page();
            }

            return NotFound();
        }

        public async Task<IActionResult> OnPostSendDocumentAsync(IFormFile pdfFile, int idInvoice, bool withAttachment)
        {
            if (pdfFile == null || pdfFile.Length == 0)
                return new JsonResult(new { successful = false, error = "PDF datoteka je obvezna." });

            var user = await _userManager.GetUserAsync(User);

            try
            {
                var invoice = await _context.Invoices
                    .Include(x => x.Partner)
                    .Include(x => x.Company)
                    .FirstOrDefaultAsync(x => x.IdInvoice == idInvoice && x.IdCompanyFk == user.IdCompanyFk);

                if (invoice == null)
                    return new JsonResult(new { successful = false, error = "Invoice not found." });

                using var stream = pdfFile.OpenReadStream();
                var pdfBytes = new byte[pdfFile.Length];
                await stream.ReadAsync(pdfBytes, 0, (int)pdfFile.Length);

                var attachments = new List<Models.File>();
                if (withAttachment)
                {
                    var itemIds = await _context.InvoiceItems
                        .Where(x => x.IdInvoiceFk == idInvoice && x.IdItemFk != null)
                        .Select(x => x.IdItemFk.Value)
                        .Distinct()
                        .ToListAsync();

                    if (itemIds.Any())
                    {
                        attachments = await _context.Files
                            .Where(x => x.IdCompanyFk == user.IdCompanyFk
                                        && itemIds.Contains(x.IdReferenceFk)
                                        && x.FileType == FileType.CodeTableItem)
                            .ToListAsync();
                    }
                }

                var emailSettings = _configuration.GetSection("EmailSettings");
                var host = emailSettings["Host"];
                var port = int.Parse(emailSettings["Port"] ?? "587");
                var secureSocketOptions = Enum.Parse<SecureSocketOptions>(emailSettings["SecureSocketOptions"] ?? "StartTls");
                var username = emailSettings["Username"];
                var password = emailSettings["Password"];
                var fromEmail = emailSettings["FromEmail"];
                var fromName = emailSettings["FromName"];
                var bcc = emailSettings["Bcc"];

                var mimeMessage = new MimeMessage();
                mimeMessage.From.Add(new MailboxAddress(fromName, fromEmail));
                mimeMessage.To.Add(new MailboxAddress(invoice.Partner.Title, invoice.Partner.Email));
                if (!string.IsNullOrWhiteSpace(bcc))
                    mimeMessage.Bcc.Add(MailboxAddress.Parse(bcc));
                mimeMessage.Subject = invoice.InvoiceNumberFull;

                var bodyBuilder = new BodyBuilder
                {
                    TextBody = $"Spoštovani,\n\nv prilogi vam pošiljamo dokument {invoice.InvoiceNumberFull}.\n\nLep pozdrav,\n{invoice.Company.Title}"
                };

                bodyBuilder.Attachments.Add(invoice.InvoiceNumberFull + ".pdf", pdfBytes, new ContentType("application", "pdf"));

                var filesFolder = System.IO.Path.Combine(_environment.WebRootPath, "Uploads", "Files", ((int)FileType.CodeTableItem).ToString());
                foreach (var file in attachments)
                {
                    var filePath = System.IO.Path.Combine(filesFolder, file.Guid + file.Extension);
                    if (System.IO.File.Exists(filePath))
                    {
                        var fileBytes = await System.IO.File.ReadAllBytesAsync(filePath);
                        bodyBuilder.Attachments.Add(file.Title + file.Extension, fileBytes);
                    }
                }

                mimeMessage.Body = bodyBuilder.ToMessageBody();

                using var smtpClient = new SmtpClient();
                await smtpClient.ConnectAsync(host, port, secureSocketOptions);
                await smtpClient.AuthenticateAsync(username, password);
                await smtpClient.SendAsync(mimeMessage);
                await smtpClient.DisconnectAsync(true);
            }
            catch (Exception ex)
            {
                return new JsonResult(new { successful = false, error = ex.Message });
            }

            return new JsonResult(new { successful = true });
        }

        public IActionResult OnPostConfirmInvoice(int idInvoice)
        {
            var user = _userManager.GetUserAsync(User).Result;
            bool successful = true;
            string error = "";

            var invoice = _context.Invoices
                .Where(x => x.IdCompanyFk == user.IdCompanyFk)
                .FirstOrDefault(x => x.IdInvoice == idInvoice);

            if (invoice != null)
            {
                invoice.State = Models.Invoice.Invoice.InvoiceState.Confirmed;

                _context.SaveChanges();
            }
            else
            {
                successful = false;
                error = $"Invoice with ID: {idInvoice} not found";
            }
            

            return new JsonResult(new { idInvoice = idInvoice, error = error, successful = successful });
        }

        private void SetTranslation(PrintTranslationLanguage printTranslationLanguage, Invoice.InvoiceState invoiceState)
        {
            Translation = new PrintTranslation();

            switch (printTranslationLanguage)
            {
                case PrintTranslationLanguage.Slovenian:
                    switch(Invoice.Type)
                    {
                        case Invoice.InvoiceType.Order:
                        case Invoice.InvoiceType.BuyersOrder:
                        if (Invoice.State == Invoice.InvoiceState.Offer)
                        {
                            Translation.InvoiceType = "Ponudba";
                        }
                        else if (Invoice.State == Invoice.InvoiceState.Inquiry)
                        {
                            Translation.InvoiceType = "Povpraševanje";
                        }
                        else if (Invoice.State == Invoice.InvoiceState.OfferConfirmation)
                        {
                            Translation.InvoiceType = "Potrditev naročila";
                        }
                        else
                        {
                            Translation.InvoiceType = "Naročilo";
                        }
                        break;
                        case Invoice.InvoiceType.Invoice:
                            Translation.InvoiceType = "Račun";
                            break;
                        case Invoice.InvoiceType.DeliveryNote:
                            Translation.InvoiceType = "Dobavnica";
                            break;
                        case Invoice.InvoiceType.Cooperation:
                            Translation.InvoiceType = "Kooperacija";
                            break;
                        default:
                            Translation.InvoiceType = "Faktura";
                            break;
                    }

                    if (invoiceState == Invoice.InvoiceState.Offer)
                        Translation.OrderNumber = "Št. povpraševanja.";
                    break;
                case PrintTranslationLanguage.German:
                    Translation = new PrintTranslation
                    {
                        Amount = "Menge",
                        Article = "Artikel",
                        Date = "Datum",
                        DateOfDispatch = "Lieferdatum",
                        DeliveryTime = "Lieferdatum",
                        Dimensions = "Maße",
                        Director = "Direktor",
                        Email = "Email",
                        Iban = "IBAN",
                        IdTax = "Ihre UID Nr.",
                        Number = "Num.",
                        OrderNumber = invoiceState == Invoice.InvoiceState.Offer ? "Anfrage No." : "Bestellnummer",
                        Price = "Preis(€)",
                        Quantity = "Menge(Stk)",
                        SwiftBic = "SWIFT/BIC",
                        Total = "Gesamtsumme",
                        Project = "Projekt",
                        Issued = "Bearbeiter:",
                        Received = "Empfänger:",
                        DeliveryNote = "Lieferschein:"
                    };
                    switch (Invoice.Type)
                    {
                        case Invoice.InvoiceType.Order:
                        case Invoice.InvoiceType.BuyersOrder:
                            if (Invoice.State == Invoice.InvoiceState.Offer)
                            {
                                Translation.InvoiceType = "Angebot";
                            }
                            else if (Invoice.State == Invoice.InvoiceState.Inquiry)
                            {
                                Translation.InvoiceType = "Anfrage";
                            }
                            else if (Invoice.State == Invoice.InvoiceState.OfferConfirmation)
                            {
                                Translation.InvoiceType = "Auftragsbestätigung";
                            }
                            else
                            {
                                Translation.InvoiceType = "Bestellung";
                            }
                            break;
                        case Invoice.InvoiceType.Invoice:
                            Translation.InvoiceType = "Rechnung";
                            break;
                        case Invoice.InvoiceType.DeliveryNote:
                            Translation.InvoiceType = "Lieferschein";
                            break;
                        case Invoice.InvoiceType.Cooperation:
                            Translation.InvoiceType = "Zusammenarbeit";
                            break;
                        default:
                            Translation.InvoiceType = "Faktura";
                            break;
                    }
                    break;
            }
        }
    }
}