using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using AutoMapper;
using gehGassi.Common.Data;
using gehGassi.Core.Interfaces;
using gehGassi.Core.Services;
using gehGassi.Domain.Common;
using gehGassi.Permissions;
using gehGassi.Web.Auth;
using gehGassi.Web.Auth.Attributes;
using gehGassi.Web.Helper;
using gehGassi.Web.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;

namespace gehGassi.Web.Controllers
{
    /// <summary>
    /// Controller für die Verwaltung von Hunden
    /// </summary>
    [Authorize]
    public class DogController : BaseController
    {
        private readonly IMapper _mapper;
        private readonly IStringLocalizer<DogController> _localizer;
        private readonly IDogService _dogService;
        private readonly IDogRaceService _dogRaceService;
        private readonly IAppUserService _appUserService;

        /// <summary>
        /// Erstellt eine Instanz
        /// </summary>
        /// <param name="mapper">Instanz eines IMapper</param>
        /// <param name="localizer">Instanz eines IStringLocalizer</param>
        /// <param name="dogService">Instanz eines IDogService</param>
        /// <param name="dogRaceService">Instanz eines IDogRaceService</param>
        /// <param name="appUserService">Instanz eines IDogOwnerService</param>
        public DogController(IMapper mapper, IStringLocalizer<DogController> localizer, IDogService dogService, IDogRaceService dogRaceService, IAppUserService appUserService)
        {
            _mapper = mapper;
            _localizer = localizer;
            _dogService = dogService;
            _dogRaceService = dogRaceService;
            _appUserService = appUserService;
        }

        /// <summary>
        /// Gibt einen View für die Hunde-Verwaltung zurück
        /// </summary>
        /// <returns>View</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsRead)]
        public IActionResult Index()
        {
            return View();
        }

        /// <summary>
        /// Gibt eine Liste von Entitäten basierend auf Abfragekriterien zurück
        /// </summary>
        /// <param name="dm">Abfragekriterien</param>
        /// <returns>Liste von gefundenen Entitäten</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsRead)]
        [HttpPost]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult GetDogs([FromBody] DataManager dm)
        {
            if (dm != null)
            {
                var propList = new List<ComplexProperty>();
                dm.SetComplexProperties(propList);

                if (dm.Where != null)
                {
                    foreach (var whereFilter in dm.Where)
                    {
                        if (whereFilter.predicates == null)
                            continue;
                        foreach (var whereFilterPredicate in whereFilter.predicates)
                        {
                            if (whereFilterPredicate.Field == "sex")
                                whereFilterPredicate.value = (DogSex)((int)((long)whereFilterPredicate.value));
                            if (whereFilterPredicate.Field == "size")
                                whereFilterPredicate.value = (DogSize)((int)((long)whereFilterPredicate.value));
                        }
                    }
                }
            }

            var resultList = _dogService.FilterWithNames(dm?.SearchValue ?? "", SelectedLanguage, FallbackLanguage);

            //Sortierung
            resultList = dm.ApplySorting(resultList);
            //Filter
            resultList = dm.ApplyFiltering(resultList, out var countFiltered);
            //Paging
            resultList = dm.ApplyPaging(resultList);

            var resultListVm = resultList.ToList().Select(item => _mapper.Map<DogListVm>(item)).ToList();

            foreach (var itemVm in resultListVm)
            {
                itemVm.Photo = Tools.GetDogPhotoThumb(itemVm.Photo, 100);
                itemVm.SexText = itemVm.Sex.GetDisplayName(AnnotationsLocalizer);
                itemVm.SizeText = itemVm.Size.GetDisplayName(AnnotationsLocalizer);
            }

            //FilterPreview?
            if (!dm.RequiresCounts)
                return Json(resultListVm);

            return Json(new { result = resultListVm, count = countFiltered });
        }

        /// <summary>
        /// Anlegen eines Hundes
        /// </summary>
        /// <returns>PartialView</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsCreate)]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public async Task<IActionResult> Create()
        {
            var model = new DogCrudVm()
            {
                Id = Guid.NewGuid().ToString("N"),
                Number = await _dogService.GetNextNumberAsync()
            };

            return PartialView("_Create", model);
        }

        /// <summary>
        /// Anlegen eines Hundes
        /// </summary>
        /// <param name="model">Model</param>
        /// <returns>Json</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsCreate)]
        [ValidateAntiForgeryToken]
        [HttpPost]
        public async Task<IActionResult> Create(DogCrudVm model)
        {
            var result = new ResponseVm { Success = false };

            if (ModelState.IsValid)
            {
                var item = _dogService.Create();
                _mapper.Map(model, item);
                if (model.BirthDate.HasValue)
                    item.BirthDate = new DateTimeOffset(model.BirthDate.Value.DateTime, TimeSpan.Zero);
                item.Created = DateTimeOffset.UtcNow;
                item.UpdatedAt = DateTimeOffset.UtcNow;

                _dogService.Add(item);
                await _dogService.CommitAsync(User.Identity.Name);

                if (!string.IsNullOrWhiteSpace(model.Photo))
                {
                    //Nun das Bild umbenennen und dann kopieren. Ebenso Thumbnails erstellen
                    var extension = Path.GetExtension(model.Photo);
                    var fileName = Path.GetFileName(model.Photo);

                    var filenameToUse = FileServiceHelper.GetDogPath(item.Id) + $"dog_{Guid.NewGuid():N}{extension}";
                    item.Photo = filenameToUse;
                    await _dogService.CommitAsync(User.Identity.Name);

                    //Kopieren
                    var tempFile = await FileService.GetAsync(FileServiceHelper.TempContainer, model.Photo);
                    await FileService.StoreAsync(FileServiceHelper.DocumentContainer, filenameToUse, tempFile);

                    //Thumbnails
                    await GenerateThumbnail(FileServiceHelper.DocumentContainer, filenameToUse, 400);
                    await GenerateThumbnail(FileServiceHelper.DocumentContainer, filenameToUse, 200);
                    await GenerateThumbnail(FileServiceHelper.DocumentContainer, filenameToUse, 100);

                    //Altes Löschen
                    await FileService.DeleteAsync(FileServiceHelper.TempContainer, model.Photo);
                }

                result.Data = item.ToCamelCaseJson();
                result.Success = true;
                result.Html = string.Empty;
                return Json(result);
            }

            ModelState.Remove("DogRaceName");
            var dogRace = await _dogRaceService.GetAsync(model.DogRaceId);
            model.DogRaceName = dogRace != null ? dogRace.Name : "";

            ModelState.Remove("AppUserName");
            var appUser = await _appUserService.GetAsync(model.AppUserId);
            model.AppUserName = appUser != null ? $"{appUser.FirstName} {appUser.LastName}" : "";

            result.Html = await PartialView("_Create", model).ToStringAsync(ControllerContext);
            return Json(result);
        }

        /// <summary>
        /// Bearbeiten eines Hundes
        /// </summary>
        /// <param name="id">Id des Hundes</param>
        /// <returns>PartialView</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsEdit)]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public async Task<IActionResult> Edit(string id)
        {
            var item = await _dogService.GetAsync(id);
            if (item != null)
            {
                var model = _mapper.Map<DogCrudVm>(item);

                var dogRace = await _dogRaceService.GetAsync(model.DogRaceId);
                model.DogRaceName = dogRace != null ? dogRace.Name : "";

                var appUser = await _appUserService.GetAsync(model.AppUserId);
                model.AppUserName = appUser != null ? $"{appUser.FirstName} {appUser.LastName}" : "";

                return PartialView("_Edit", model);
            }
            return PartialView("_Error");
        }

        /// <summary>
        /// Bearbeiten eines Hundes
        /// </summary>
        /// <param name="model">Model</param>
        /// <returns>Json</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsEdit)]
        [ValidateAntiForgeryToken]
        [HttpPost]
        public async Task<IActionResult> Edit(DogCrudVm model)
        {
            var result = new ResponseVm { Success = false };

            if (ModelState.IsValid)
            {
                var item = await _dogService.GetAsync(model.Id);
                if (item is { Deleted: false })
                {
                    if (item.Version.SequenceEqual(model.Version))
                    {
                        var oldPhoto = item.Photo;

                        _mapper.Map(model, item);

                        if (model.BirthDate.HasValue)
                            item.BirthDate = new DateTimeOffset(model.BirthDate.Value.DateTime, TimeSpan.Zero);

                        item.UpdatedAt = DateTimeOffset.UtcNow;

                        if (oldPhoto != item.Photo)
                        {
                            //Alte Daten löschen, neue Daten anlegen
                            if (!string.IsNullOrWhiteSpace(oldPhoto))
                            {
                                await FileService.DeleteAsync(FileServiceHelper.DocumentContainer, oldPhoto);
                                await RemoveThumbnail(FileServiceHelper.DocumentContainer, oldPhoto, 400);
                                await RemoveThumbnail(FileServiceHelper.DocumentContainer, oldPhoto, 200);
                                await RemoveThumbnail(FileServiceHelper.DocumentContainer, oldPhoto, 100);
                            }

                            if (!string.IsNullOrWhiteSpace(item.Photo))
                            {
                                //Neue Bilddaten verwenden....
                                var extension = Path.GetExtension(item.Photo);
                                var fileName = Path.GetFileName(item.Photo);
                                var filenameToUse = FileServiceHelper.GetDogPath(item.Id) + $"dog_-{Guid.NewGuid():N}{extension}";
                                item.Photo = filenameToUse;

                                //Kopieren
                                var tempFile = await FileService.GetAsync(FileServiceHelper.TempContainer, model.Photo);
                                await FileService.StoreAsync(FileServiceHelper.DocumentContainer, filenameToUse, tempFile);

                                //Thumbnails
                                await GenerateThumbnailByWidth(FileServiceHelper.DocumentContainer, filenameToUse, 400);
                                await GenerateThumbnailByWidth(FileServiceHelper.DocumentContainer, filenameToUse, 200);
                                await GenerateThumbnailByWidth(FileServiceHelper.DocumentContainer, filenameToUse, 100);

                                //Altes Löschen
                                await FileService.DeleteAsync(FileServiceHelper.TempContainer, model.Photo);
                            }
                        }

                        await _dogService.CommitAsync(User.Identity.Name);

                        result.Data = item.ToCamelCaseJson();
                        result.Success = true;
                        result.Html = string.Empty;
                        return Json(new { result.Success, result.Html, result.Data });
                    }
                    else
                    {
                        ModelState.AddModelError("", _localizer["Err_Entity_Changed"].Value);
                    }
                }
                else
                {
                    ModelState.AddModelError("", _localizer["Err_Entity_Deleted"].Value);
                }
            }

            ModelState.Remove("DogRaceName");
            var dogRace = await _dogRaceService.GetAsync(model.DogRaceId);
            model.DogRaceName = dogRace != null ? dogRace.Name : "";

            ModelState.Remove("AppUserName");
            var appUser = await _appUserService.GetAsync(model.AppUserId);
            model.AppUserName = appUser != null ? $"{appUser.FirstName} {appUser.LastName}" : "";

            result.Html = await PartialView("_Edit", model).ToStringAsync(ControllerContext);
            return Json(result);
        }

        /// <summary>
        /// Löschen eines Hundes
        /// </summary>
        /// <param name="ids">Liste Id der Entität</param>
        /// <param name="forceDelete">Sollen die Daten physisch gelöscht werden?</param>
        /// <returns>Json</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.DogsManage, Permission.DogsDelete)]
        [HttpPost]
        public async Task<IActionResult> Delete(List<string> ids, bool forceDelete = false)
        {
            var batchErrorHeader = $"<p><strong>{_localizer["Common_BatchDelete_Failed"].Value}</strong></p>";
            var batchResult = new BatchResponseVm(batchErrorHeader) { Success = true };

            foreach (var id in ids)
            {
                var item = await _dogService.GetAsync(id);
                if (item != null)
                {
                    //await _customerService.ResetTypeAsync(item.Id); //Spezial zurücksetzen wenn nötig

                    var specialCount = 0;
                    if (specialCount == 0)
                    {
                        batchResult.BatchResponseList.Add(new BatchResponseItemVm() { Id = item.Id.ToString(), Name = item.Name, Success = true, NotFound = false, ErrorMessage = "" });

                        if (forceDelete)
                        {
                            var postingPath = FileServiceHelper.GetDogPath(item.Id);
                            await FileService.ClearDirectoryAsync(FileServiceHelper.DocumentContainer, postingPath);
                            await RemoveThumbnail(FileServiceHelper.DocumentContainer, item.Photo, 400);
                            await RemoveThumbnail(FileServiceHelper.DocumentContainer, item.Photo, 200);
                            await RemoveThumbnail(FileServiceHelper.DocumentContainer, item.Photo, 100);

                            _dogService.Remove(item);
                        }
                        else
                        {
                            item.Deleted = true;
                            item.UpdatedAt = DateTimeOffset.UtcNow;
                        }
                    }
                    else
                    {
                        if (specialCount != 0)
                        {
                            batchResult.Success = false;
                            batchResult.BatchResponseList.Add(new BatchResponseItemVm() { Id = id.ToString(), Name = item.Name, Success = false, NotFound = false, ErrorMessage = string.Format(_localizer["Common_BatchDelete_InUse"], $"<strong>{item.Name}</strong>", $"<strong>{specialCount}</strong>") + "<br/>" });
                        }
                    }
                }
                else
                {
                    batchResult.Success = false;
                    batchResult.BatchResponseList.Add(new BatchResponseItemVm() { Id = id.ToString(), Name = "", Success = false, NotFound = true, ErrorMessage = string.Format(_localizer["Common_BatchDelete_NotFound"], $"<strong>{id}</strong>") + "<br/>" });
                }
            }
            if (batchResult.BatchResponseList.Any(c => c.Success))
                await _dogService.CommitAsync(User.Identity.Name);
            return Json(batchResult);
        }
    }
}