using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using EveryThing.Data;
using EveryThing.Models;
using Microsoft.AspNetCore.Http;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using DocumentFormat.OpenXml.Spreadsheet;
using Microsoft.VisualBasic.FileIO;
using EveryThing.Models.CodeTable;
using Microsoft.EntityFrameworkCore;

namespace EveryThing.Pages.Files
{
    [Authorize(Roles = "Administrator")]
    public class UploadModel : PageModel
    {
        private readonly IWebHostEnvironment _hostingEnvironment;
        private readonly ApplicationDbContext _context;
        private readonly UserManager<IdentityApplicationUser> _userManager;
        private readonly SignInManager<IdentityApplicationUser> _loginManager;
        private readonly RoleManager<IdentityApplicationRole> _roleManager;

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


        [BindProperty]
        public IFormFile File { get; set; }
        [BindProperty]
        public int IdReferenceFk { get; set; }
        [BindProperty]
        public int FileTypeInt { get; set; }
        public string Referer { get; set; }

        public IActionResult OnGet(int idReferenceFk, FileType fileType)
        {
            if (idReferenceFk <= 0 || (int)fileType < 0)
                return NotFound();

            IdReferenceFk = idReferenceFk;
            FileTypeInt = (int)fileType;

            Referer = Request.Headers["Referer"].ToString();

            return Page();
        }

        public async Task<IActionResult> OnPostUpload(int idReferenceFk, int fileTypeInt, List<IFormFile> postedFiles, string referer)
        {
            if (postedFiles is not { Count: > 0 })
            {
                return NotFound();
            }

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

            var fileType = (FileType)fileTypeInt;

            var path = GetFolder(user.IdCompanyFk, fileType);// Path.Combine(_hostingEnvironment.WebRootPath, "Uploads", "Files", user.IdCompanyFk.ToString(), fileTypeInt.ToString());

            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }

            foreach (var formFile in postedFiles)
            {
                var guid = Guid.NewGuid().ToString().Replace("-", "_");
                var extension = Path.GetExtension(formFile.FileName);
                var fileName = guid + extension;

                await using var stream = new FileStream(Path.Combine(path, fileName), FileMode.Create);
                await formFile.CopyToAsync(stream);

                var newFile = new Models.File
                {
                    IdCompanyFk = user.IdCompanyFk,
                    IdReferenceFk = idReferenceFk,
                    Title = formFile.FileName,
                    Extension = extension,
                    Guid = guid,
                    Salt = "",
                    Iv = "",
                    DateOfUpload = DateTime.Now,
                    FileType = fileType
                };

                _context.Files.Add(newFile);
                await _context.SaveChangesAsync();
            }

            if (!string.IsNullOrEmpty(referer))
            {
                return Redirect(referer);
            }

            switch (fileType)
            {
                case FileType.CodeTableItem:
                    return RedirectToPage("/CodeTableItems/Index");
                default:
                    return RedirectToPage("/Index");
            }
        }

        private string GetFolder(int idCompany, FileType fileType)
        {
            //return Path.Combine(_hostingEnvironment.WebRootPath, "Uploads", "Files", idCompany.ToString(), ((int)fileType).ToString());
            return Path.Combine(_hostingEnvironment.WebRootPath, "Uploads", "Files", ((int)fileType).ToString());
        }

        public FileResult OnGetDownloadFile(int idFile, int idReferenceFk, int fileTypeInt)
        {
            var user = _userManager.GetUserAsync(User).Result;

            var fileType = (FileType)fileTypeInt;

            var file = _context.Files
                .FirstOrDefault(x => x.IdCompanyFk == user.IdCompanyFk 
                                     && x.IdReferenceFk == idReferenceFk 
                                     && x.IdFile == idFile);

            if (file == null)
                return null;

            var path = Path.Combine(GetFolder(user.IdCompanyFk, fileType), file.Guid + file.Extension);

            var bytes = System.IO.File.ReadAllBytes(path);

            return File(bytes, "application/octet-stream", file.Title);
        }

        public IActionResult OnDeleteFile(int idFile)
        {
            var user = _userManager.GetUserAsync(User).Result;

            var file = _context.Files
                .Where(x => x.IdCompanyFk == user.IdCompanyFk)
                .FirstOrDefault(x => x.IdFile == idFile);

            if (file == null)
            {
                return new JsonResult(new { idFile, error = $"File with id {idFile} not exists!", successful = false });
            }

            var path = Path.Combine(GetFolder(user.IdCompanyFk, file.FileType), file.Guid + file.Extension);

            if (System.IO.File.Exists(path))
            {
                System.IO.File.Delete(path);
            }
            //else
            //{
            //    return new JsonResult(new { idFile, error = "File path not exists!", successful = false });
            //}

            if (System.IO.File.Exists(path))
            {
                return new JsonResult(new { idFile, error = "File was not deleted from disk!", successful = false });
            }

            _context.Files.Remove(file);
            _context.SaveChanges();

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

        public IActionResult OnGetFile(int idFile)
        {
            var user = _userManager.GetUserAsync(User).Result;

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

            var file = _context.Files
                .Where(x => x.IdCompanyFk == user.IdCompanyFk)
                .FirstOrDefault(x => x.IdFile == idFile);

            if (file == null)
            {
                successful = false;
                error = $"File with ID: {idFile} not found";
            }
            else
            {
                //TODO prever in use
                inUse = false;
            }

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