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.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.EntityFrameworkCore;
using Microsoft.Extensions.Localization;

namespace gehGassi.Web.Controllers
{
    /// <summary>
    /// Controller für die Verwaltung von Steuern
    /// </summary>
    [Authorize]
    public class TaxRateController : BaseController
    {
        private readonly IMapper _mapper;
        private readonly IStringLocalizer<TaxRateController> _localizer;
        private readonly ITaxRateService _taxRateService;
        private readonly ILanguageService _languageService;
        private readonly ICountryService _countryService;
        private readonly IProductService _productService;

        /// <summary>
        /// Erstellt eine Instanz
        /// </summary>
        /// <param name="mapper">Instanz eines IMapper</param>
        /// <param name="localizer">Instanz eines IStringLocalizer</param>
        /// <param name="taxRateService">Instanz eines ITaxRateService</param>
        /// <param name="languageService">Instanz eines ILanguageService</param>
        /// <param name="countryService">Instanz eines ICountryService</param>
        /// <param name="productService">Instanz eines IProductService</param>
        public TaxRateController(IMapper mapper, IStringLocalizer<TaxRateController> localizer, ITaxRateService taxRateService, ILanguageService languageService, ICountryService countryService, 
            IProductService productService)
        {
            _mapper = mapper;
            _localizer = localizer;
            _taxRateService = taxRateService;
            _languageService = languageService;
            _countryService = countryService;
            _productService = productService;
        }

        /// <summary>
        /// Gibt einen View für die Steuer-Verwaltung zurück
        /// </summary>
        /// <returns>View</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.SettingsManage, Permission.SettingsTaxRates)]
        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.SettingsManage, Permission.SettingsTaxRates)]
        [HttpPost]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult GetTaxRates([FromBody] DataManager dm)
        {
            if (dm != null)
            {
                var propList = new List<ComplexProperty>();
                dm.SetComplexProperties(propList);
            }

            var resultList = _taxRateService.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<TaxRateListVm>(item)).ToList();

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

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

        /// <summary>
        /// Anlegen einer Steuer
        /// </summary>
        /// <returns>PartialView</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.SettingsManage, Permission.SettingsTaxRates)]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Create()
        {
            var model = new TaxRateCrudVm()
            {
                TextVms = new List<TaxRateTextVm>(),
            };

            foreach (var language in _languageService.GetAllIso2())
            {
                model.TextVms.Add(new TaxRateTextVm() { Id = model.Id, Language = language, Name = string.Empty});
            }

            return PartialView("_Create", model);
        }

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

            if (ModelState.IsValid)
            {
                var exists = await _taxRateService.ExistsAsync(model.CountryIso, model.Value);
                if (!exists)
                {
                    var item = _taxRateService.Create();
                    _mapper.Map(model, item);

                    if (item.UseForShipment)
                        await _taxRateService.ResetShipmentAsync(-1);

                    // Texte setzen
                    foreach (var textVm in model.TextVms)
                    {
                        item.Set("Name", textVm.Language, textVm.Name);
                    }

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

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

            ModelState.Remove("CountryName");
            var country = _countryService.GetCountry(model.CountryIso);
            model.CountryName = country != null ? country.Name : "";

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

        /// <summary>
        /// Bearbeiten einer Steuer
        /// </summary>
        /// <param name="id">Id der Branche</param>
        /// <returns>PartialView</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.SettingsManage, Permission.SettingsTaxRates)]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public async Task<IActionResult> Edit(int id)
        {
            var item = await _taxRateService.GetAsync(id);
            if (item != null)
            {
                var model = _mapper.Map<TaxRateCrudVm>(item);

                model.TextVms = new List<TaxRateTextVm>();
                foreach (var language in _languageService.GetAllIso2())
                {
                    model.TextVms.Add(new TaxRateTextVm()
                    {
                        Id = item.Id,
                        Language = language,
                        Name = item.Get("Name", language, true)
                    });
                }

                var country = _countryService.GetCountry(item.CountryIso);
                model.CountryName = country != null ? country.Name : "";

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

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

            if (ModelState.IsValid)
            {
                var item = await _taxRateService.GetAsync(model.Id);
                if (item != null)
                {
                    _mapper.Map(model, item);

                    if(item.UseForShipment)
                        await _taxRateService.ResetShipmentAsync(item.Id);

                    //Texte setzen
                    foreach (var textVm in model.TextVms)
                    {
                        item.Set("Name", textVm.Language, textVm.Name);
                    }

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

                    result.Data = item.ToCamelCaseJson();
                    result.Success = true;
                    result.Html = string.Empty;
                    return Json(new { result.Success, result.Html, result.Data });
                }
            }
            ModelState.Remove("CountryName");
            var country = _countryService.GetCountry(model.CountryIso);
            model.CountryName = country != null ? country.Name : "";

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

        /// <summary>
        /// Löschen einer Steuer
        /// </summary>
        /// <param name="ids">Liste Id der Entität</param>
        /// <returns>Json</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.SettingsManage, Permission.SettingsTaxRates)]
        [HttpPost]
        public async Task<IActionResult> Delete(List<int> ids)
        {
            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 _taxRateService.GetAsync(id);
                if (item != null)
                {
                    //await _customerService.ResetTypeAsync(item.Id); //Spezial zurücksetzen wenn nötig
                    var usedCount = 0;

                    var productCount = await _productService.CountByTaxRateAsync(item.Id);
                    usedCount += productCount;

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

                        _taxRateService.Remove(item);
                    }
                    else
                    {
                        if (usedCount != 0)
                        {
                            batchResult.Success = false;
                            batchResult.BatchResponseList.Add(new BatchResponseItemVm() { Id = id.ToString(), Name = item.Title, Success = false, NotFound = false, ErrorMessage = string.Format(_localizer["Common_BatchDelete_InUse"], $"<strong>{item.Title}</strong>", $"<strong>{usedCount}</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 _taxRateService.CommitAsync(User.Identity.Name);
            return Json(batchResult);
        }

        #region Lookup

        /// <summary>
        /// Gibt eine Liste von Steuerstufen für LookUp zurück
        /// </summary>
        /// <param name="dm">DataManager</param>
        /// <param name="includeNone">Soll "Keine(r)" integriert werden</param>
        /// <returns>Liste</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        public async Task<IActionResult> Lookup([FromBody] DataManager dm, bool includeNone = false)
        {
            var filter = string.Empty;
            if (dm.Where?.FirstOrDefault() != null)
            {
                filter = dm.Where.First().value.ToString();
                if (filter.IndexOf('(') > 0)
                {
                    filter = filter.Substring(0, (filter.IndexOf('(') - 1));
                    filter = filter.TrimEnd();
                }
            }

            var items = await _taxRateService.FilterWithNames(filter, SelectedLanguage, FallbackLanguage).ToListAsync();
            var result = items.Select(item => new LookupItemVm() { Id = item.Id.ToString(), Name = $"{item.Name} ({item.Value:n2}%)" }).OrderBy(c => c.Name).ToList();

            if (includeNone)
                result.Insert(0, new LookupItemVm() { Id = "-1", Name = _localizer["Common_None"].ToString() });

            return Json(result);
        }

        #endregion
    }
}