using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;
using EveryThing.Data;
using EveryThing.Models;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Authorization;
using System.Text.Json;

namespace EveryThing.Pages.Invoices
{
    [Authorize(Roles = "Administrator,InvoicingUser")]
    public class EditModel : PageModel
    {
        public class EditInvoiceItemData
        {
            public Models.Invoice.InvoiceItem InvoiceItem { get; set; }

            public SelectList SelectListItems { get; set; }
            //public SelectList SelectListMaterials { get; set; }
            //public SelectList SelectListSuppliers { get; set; }

        }

        private readonly ApplicationDbContext _context;
        private readonly UserManager<IdentityApplicationUser> _userManager;
        private readonly SignInManager<IdentityApplicationUser> _loginManager;
        private readonly RoleManager<IdentityApplicationRole> _roleManager;

        public EditModel(ApplicationDbContext context, UserManager<IdentityApplicationUser> userManager, SignInManager<IdentityApplicationUser> loginManager, RoleManager<IdentityApplicationRole> roleManager)
        {
            _context = context;
            _userManager = userManager;
            _loginManager = loginManager;
            _roleManager = roleManager;
        }

        [BindProperty]
        public Models.Invoice.Invoice Invoice { get; set; }
        public IList<Models.Invoice.InvoiceItem> InvoiceItems { get; set; }

        [BindProperty]
        public string Reffer { get; set; }

        public async Task<IActionResult> OnGetAsync(int? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            Invoice = await _context.Invoices
                .Include(f => f.Company).FirstOrDefaultAsync(m => m.IdInvoice == id);

            var user = _userManager.GetUserAsync(User).Result;

            if (Invoice == null)
            {
                return NotFound();
            }

            InvoiceItems = await _context.InvoiceItems
                .Include(f => f.Item)
                .Where(m => m.IdInvoiceFk == id)
                .ToListAsync();

            ViewData["Type"] = (int)Invoice.Type;
            ViewData["IdPartnerFk"] = new SelectList(_context.CodeTablePartners.Where(x => x.IdCompanyFk == user.IdCompanyFk && x.Active), "IdPartner", "Title");

            ViewData["States"] = new SelectList(Enum.GetValues(typeof(Models.Invoice.Invoice.InvoiceState))
                .Cast<Models.Invoice.Invoice.InvoiceState>()
                .Where(x => GetAttribute<Models.Invoice.Invoice.InvoiceStateAttribute>(x).AllowedTypes.Split(',').Contains(((int)Invoice.Type).ToString()))
                .Select(x => new { Name = GetAttribute<DisplayAttribute>(x).Name, Value = x.ToString()})
                .ToList(), "Value", "Name");

            if (!string.IsNullOrEmpty(Request.Headers["Referer"]))
            {
                ViewData["Reffer"] = Reffer = Request.Headers["Referer"].ToString();
            }

            return Page();
        }

        public static TAttribute GetAttribute<TAttribute>(Enum value)
            where TAttribute : Attribute
        {
            var enumType = value.GetType();
            var name = Enum.GetName(enumType, value);
            return enumType.GetField(name).GetCustomAttributes(false).OfType<TAttribute>().SingleOrDefault();
        }

        // To protect from overposting attacks, please enable the specific properties you want to bind to, for
        // more details see https://aka.ms/RazorPagesCRUD.
        public async Task<IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }

            Invoice.PostText = Invoice.PostText.Replace("<div><br></div>", "");
            Invoice.PreText = Invoice.PreText.Replace("<div><br></div>", "");

            _context.Attach(Invoice).State = EntityState.Modified;
            
            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!FileExists(Invoice.IdInvoice))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return RedirectToPage("./Edit", new { id = Invoice.IdInvoice});


            if (Reffer != null)
                return RedirectToPage(Reffer);

            return RedirectToPage("./Index", new { type = (int)Invoice.Type });
        }

        private bool FileExists(int id)
        {
            return _context.Invoices.Any(e => e.IdInvoice == id);
        }

        public IActionResult OnPostUpdateInvoiceItem(int idItem, string json)
        {
            var tmpItem = JsonSerializer.Deserialize<Models.Invoice.InvoiceItem>(json);

            var item = _context.InvoiceItems.First(x => x.IdInvoiceItem == idItem);

            if (item == null)
            {
                //TODO error
                return new OkResult();
            }

            item.IdItemFk = tmpItem.IdItemFk;
            item.Quantity = tmpItem.Quantity;
            item.Price = tmpItem.Price;
            item.Discount = tmpItem.Discount;
            item.Tax = tmpItem.Tax;
            item.State = tmpItem.State;
            item.ItemDescription = tmpItem.ItemDescription;

            _context.SaveChanges();

            return new OkResult();
        }

        public IActionResult OnGetInvoiceItemEdit(int id)
        {
            var user = _userManager.GetUserAsync(User).Result;

            var item = _context.InvoiceItems
                .Include(x => x.Item)
                .First(x => x.IdInvoiceItem == id);
            var selListItems = new SelectList(_context.CodeTableItems.Where(x => x.IdCompanyFk == user.IdCompanyFk && x.Active), "IdItem", "Title");


            return Partial("InvoiceItemEdit", new EditInvoiceItemData
            {
                InvoiceItem = item,
                SelectListItems = selListItems,

            });
        }

        public IActionResult OnGetInvoiceItemDetails(int id)
        {
            var item = _context.InvoiceItems
                .Include(x => x.Item)
                .Include(x => x.Invoice)
                .First(x => x.IdInvoiceItem == id);

            return Partial("InvoiceItemDetails", item);
        }

        public IActionResult OnDeleteInvoiceItem(int idInvoiceItem)
        {
            var user = _userManager.GetUserAsync(User).Result;

            var item = _context.InvoiceItems
                .Include(x => x.Invoice)
                .FirstOrDefault(x => x.IdInvoiceItem == idInvoiceItem
                                     && x.Invoice.IdCompanyFk == user.IdCompanyFk);

            if (item == null)
            {
                return new JsonResult(new { error = $"Invoice item with id {idInvoiceItem} not exists!", successful = false });
            }

            _context.InvoiceItems.Remove(item);
            _context.SaveChanges();

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

        public IActionResult OnGetInvoiceItem(int idInvoiceItem)
        {
            var user = _userManager.GetUserAsync(User).Result;

            var successful = true;
            var error = "";
            var inUse = false;

            var invoiceItem = _context.InvoiceItems
                .Include(x => x.Invoice)
                .FirstOrDefault(x => x.IdInvoiceItem == idInvoiceItem
                                     && x.Invoice.IdCompanyFk == user.IdCompanyFk);

            if (invoiceItem == null)
            {
                successful = false;
                error = $"Invoice item with ID: {idInvoiceItem} not found";
            }
            else
            {
                inUse = false;
                //Cene se json zacikla neki IDK.
                invoiceItem.Invoice = null;
            }

            return new JsonResult(new { invoiceItem, error, successful, inUse });
        }
    }
}