using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using EveryThing.Data;
using EveryThing.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using ClosedXML.Excel;
using System.IO;
using Microsoft.AspNetCore.Hosting;

namespace EveryThing.Pages.Invoices
{
    [Authorize(Roles = "Administrator,InvoicingUser")]
    public class IndexModel : PageModel
    {
        private readonly IWebHostEnvironment _hostingEnvironment;
        private readonly ApplicationDbContext _context;
        private readonly UserManager<IdentityApplicationUser> _userManager;

        public IndexModel(ApplicationDbContext context, UserManager<IdentityApplicationUser> userManager, IWebHostEnvironment environment)
        {
            _context = context;
            _userManager = userManager;
            _hostingEnvironment = environment;
        }

        public IList<Models.Invoice.Invoice> Invoice { get;set; }
        public bool ShowProjects { get; set; } = false;

        public async Task OnGetAsync(int type, string searchString, string finishedProjects)
        {
            var user = _userManager.GetUserAsync(User).Result;

            var invoiceType = (Models.Invoice.Invoice.InvoiceType)type;

            //Kako spraviti type preko osvezovanja
            ViewData["Type"] = type;
            ViewData["SearchString"] = searchString;
            ViewData["FinishedProjects"] = finishedProjects == "on" ? "checked" : "";

            Invoice = await _context.Invoices
                .Include(p => p.Company)
                .Include(p => p.Partner)
                .Where(x => x.Type == invoiceType)
                .OrderBy(x => x.InvoiceYear)
                .ThenBy(x => x.InvoiceNumber)
                .ToListAsync(); 

            // Search string
            if (!string.IsNullOrEmpty(searchString))
            {
                Invoice = Invoice.Where(s => s.Partner.Title.Contains(searchString, StringComparison.OrdinalIgnoreCase) 
                                             || s.InvoiceNumberFormatted.Contains(searchString, StringComparison.OrdinalIgnoreCase)).ToList();
            }
        }

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

            var invoice = _context.Invoices
                .Where(x => x.IdCompanyFk == user.IdCompanyFk)
                .FirstOrDefault(x => x.IdInvoice == idInvoice);
            if (invoice != null)
            {
                var invoiceItems = _context.InvoiceItems.Where(x => x.IdInvoiceFk == idInvoice).ToList(); 

                for (var i = 0; i < invoiceItems.Count(); i++)
                {
                    _context.InvoiceItems.Remove(invoiceItems[i]);
                }
                _context.Invoices.Remove(invoice);
                _context.SaveChanges();
            }
            else
            {
                successful = false;
                error = $"Invoice with ID: {idInvoice} not found";
            }

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

        public IActionResult OnGetExcel(int idInvoice)
        {
            var user = _userManager.GetUserAsync(User).Result;
            var successful = true;
            var error = "";
            var name = "";
            var base64 = "";

            var invoice = _context.Invoices
                .Where(x => x.IdCompanyFk == user.IdCompanyFk)
                .FirstOrDefault(x => x.IdInvoice == idInvoice);
            if (invoice != null)
            {
                name = invoice.InvoiceNumberFull.Replace("-", "_") + ".xlsx";

                var invoiceItems = _context.InvoiceItems
                    .Include(x => x.Item)
                    .Include(x => x.InvoiceItemJoin)
                    .ThenInclude(x=> x.Invoice)
                    .Where(x => x.IdInvoiceFk == idInvoice).ToList();

                var workbook = new XLWorkbook();
                var workSheet = workbook.Worksheets.Add("Dokument");

                var counter = 1;
                workSheet.Cell($"A{counter}").Value = "Artikel";
                workSheet.Cell($"B{counter}").Value = "Količina";
                workSheet.Cell($"C{counter}").Value = "Cena";
                workSheet.Cell($"D{counter}").Value = "Rabat";
                workSheet.Cell($"E{counter}").Value = "Vrednost";
                workSheet.Cell($"F{counter}").Value = "Opis";
                workSheet.Cell($"G{counter}").Value = "Št. kup. naročila";
                workSheet.Cell($"H{counter}").Value = "Št. naročila";
                workSheet.Cell($"I{counter}").Value = "Dobavni rok";
                //workSheet.Cell($"J{counter}").Value = "DN Z";
                //workSheet.Cell($"K{counter}").Value = "DN Z Vnos";
                //workSheet.Cell($"L{counter}").Value = "DN P";
                //workSheet.Cell($"M{counter}").Value = "DN P Vnos";
                //workSheet.Cell($"N{counter}").Value = "DN N";
                //workSheet.Cell($"O{counter}").Value = "DN N Vnos";
                //workSheet.Cell($"P{counter}").Value = "Prihod/Odhod nepreračunan";
                //workSheet.Cell($"Q{counter}").Value = "Skupaj nepreračunan";

                foreach (var invoiceItem in invoiceItems)
                {
                    counter++;
                    workSheet.Cell($"A{counter}").Value = invoiceItem.Item?.Title;
                    workSheet.Cell($"B{counter}").Value = invoiceItem.Quantity;
                    workSheet.Cell($"C{counter}").Value = invoiceItem.Price;
                    workSheet.Cell($"D{counter}").Value = invoiceItem.Discount;
                    workSheet.Cell($"E{counter}").Value = invoiceItem.TotalValue;
                    workSheet.Cell($"F{counter}").Value = invoiceItem.ItemDescription;
                    workSheet.Cell($"G{counter}").Value = "'" + invoiceItem.InvoiceItemJoin?.Invoice?.BuyersOrderNumber;
                    workSheet.Cell($"H{counter}").Value = "'" + invoiceItem.InvoiceItemJoin?.Invoice?.InvoiceNumberFormatted;
                    workSheet.Cell($"I{counter}").Value = invoice.DateOfDispatch == null ? "" : ((DateTime)invoice.DateOfDispatch).ToString("dd.MM.yyyy");
                }

                //var range = workSheet.Range(1, 1, counter - 1, 9);

                //var table = range.CreateTable();
                //table.Theme = XLTableTheme.TableStyleMedium5;

                var tmpFilePath = Path.Combine(_hostingEnvironment.WebRootPath, "Uploads", Guid.NewGuid().ToString().Replace("-", "_") + ".xlsx");
                workbook.SaveAs(tmpFilePath);

                var tempByte = System.IO.File.ReadAllBytes(tmpFilePath);
                base64 = Convert.ToBase64String(tempByte);
                System.IO.File.Delete(tmpFilePath);

            }
            else
            {
                successful = false;
                error = $"Invoice with ID: {idInvoice} not found";
            }

            return new JsonResult(new { idInvoice, error, successful, name, base64 });
        }
    }
}