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

namespace gehGassi.Web.Controllers
{
    /// <summary>
    /// Controller für die Verwaltung von Appversionen
    /// </summary>
    [Authorize]
    public class AppVersionController : BaseController
    {
        private readonly IMapper _mapper;
        private readonly IStringLocalizer<AppVersionController> _localizer;
        private readonly IAppVersionService _appVersionService;
        private readonly ILanguageService _languageService;

        /// <summary>
		/// Erstellt eine Instanz
		/// </summary>
		/// <param name="mapper">Instanz eines IMapper</param>
		/// <param name="localizer">Instanz eines IStringLocalizer</param>
		/// <param name="appVersionService">Instanz eines IAppVersionService</param>
		/// <param name="languageService">Instanz eines ILanguageService</param>
		public AppVersionController(IMapper mapper, IStringLocalizer<AppVersionController> localizer, IAppVersionService appVersionService, ILanguageService languageService)
        {
            _mapper = mapper;
            _localizer = localizer;
            _appVersionService = appVersionService;
            _languageService = languageService;
        }

        /// <summary>
        /// Gibt einen View für die AppVersion-Verwaltung zurück
        /// </summary>
        /// <returns>View</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.AppVersionsAccess)]
        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.AppVersionsAccess)]
        [HttpPost]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult GetAppVersions([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 == "platform")
                                whereFilterPredicate.value = (Platform)((int)((long)whereFilterPredicate.value));
                        }
                    }
                }
            }

            var resultList = _appVersionService.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<AppVersionListVm>(item)).ToList();

            foreach (var itemVm in resultListVm)
            {
                itemVm.PlatformText = itemVm.Platform.GetDisplayName(AnnotationsLocalizer);
            }

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

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

        /// <summary>
        /// Anlegen einer Appversion
        /// </summary>
        /// <returns>PartialView</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.AppVersionsAccess)]
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Create()
        {
	        var model = new AppVersionVm()
	        {
                Platform = PlatformVm.Android,
                Major = 1,
                Minor = 0,
                Version = "1.0",
                ReleaseDate = DateTimeOffset.UtcNow,
		        TextVms = new List<AppVersionTextVm>()
	        };

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

	        return PartialView("_Create", model);
        }

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

            if (ModelState.IsValid)
            {
                var version = new Version(model.Major, model.Minor);
                if (model.Build.HasValue)
                    version = new Version(model.Major, model.Minor, model.Build.Value);
                if (model.Build.HasValue && model.Revision.HasValue)
                    version = new Version(model.Major, model.Minor, model.Build.Value, model.Revision.Value);

                var versionExists = await _appVersionService.VersionExistsAsync((Platform)model.Platform, version.ToString(), -1);

                if (!versionExists)
                {
                    var item = _appVersionService.Create();
                    _mapper.Map(model, item);

                    item.Version = version.ToString();
                    item.Created = DateTimeOffset.UtcNow;
                    item.LastUpdate = DateTimeOffset.UtcNow;

                    var hasCurrent = await _appVersionService.HasCurrentAsync(item.Platform, -1);
                    if (!hasCurrent && !item.IsCurrent)
                    {
                        item.IsCurrent = true;
                    }

                    if (hasCurrent && item.IsCurrent)
                    {
                        await _appVersionService.ResetCurrentAsync(item.Platform, User.Identity.Name);
                    }

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

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

                    result.Data = item.ToCamelCaseJson();
                    result.Success = true;
                    result.Html = string.Empty;
                    return Json(result);
                }
                else
                {
                    ModelState.AddModelError("Major", _localizer["Err_AppVersion_Exists"]);
                    ModelState.AddModelError("Minor", _localizer["Err_AppVersion_Exists"]);
                    if(model.Build.HasValue)
                        ModelState.AddModelError("Build", _localizer["Err_AppVersion_Exists"]);
                    if (model.Revision.HasValue)
                        ModelState.AddModelError("Revision", _localizer["Err_AppVersion_Exists"]);
                }
            }

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

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

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

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

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

            if (ModelState.IsValid)
            {
                var version = new Version(model.Major, model.Minor);
                if (model.Build.HasValue)
                    version = new Version(model.Major, model.Minor, model.Build.Value);
                if (model.Build.HasValue && model.Revision.HasValue)
                    version = new Version(model.Major, model.Minor, model.Build.Value, model.Revision.Value);

                var versionExists = await _appVersionService.VersionExistsAsync((Platform)model.Platform, version.ToString(), model.Id);

                if (!versionExists)
                {
                    var item = await _appVersionService.GetAsync(model.Id);
                    if (item != null)
                    {
                        _mapper.Map(model, item);

                        item.Version = version.ToString();
                        item.LastUpdate = DateTimeOffset.UtcNow;

                        var hasCurrent = await _appVersionService.HasCurrentAsync(item.Platform, item.Id);
                        if (!hasCurrent && !item.IsCurrent)
                        {
                            item.IsCurrent = true;
                        }

                        if (hasCurrent && item.IsCurrent)
                        {
                            await _appVersionService.ResetCurrentAsync(item.Platform, User.Identity.Name);
                        }

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

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

                        result.Data = item.ToCamelCaseJson();
                        result.Success = true;
                        result.Html = string.Empty;
                        return Json(result);
                    }
                    else
                    {
                        ModelState.AddModelError("", _localizer["Err_Entity_Deleted"].Value);
                    }
                }
                else
                {
                    ModelState.AddModelError("Major", _localizer["Err_AppVersion_Exists"]);
                    ModelState.AddModelError("Minor", _localizer["Err_AppVersion_Exists"]);
                    if (model.Build.HasValue)
                        ModelState.AddModelError("Build", _localizer["Err_AppVersion_Exists"]);
                    if (model.Revision.HasValue)
                        ModelState.AddModelError("Revision", _localizer["Err_AppVersion_Exists"]);
                }
            }

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

        /// <summary>
        /// Löschen einer Appversion
        /// </summary>
        /// <param name="ids">Liste Id der Entität</param>
        /// <returns>Json</returns>
        [Authorize(Policy = Policies.PowerUserOnly)]
        [HasPermission(Permission.AppVersionsAccess)]
        [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 _appVersionService.GetAsync(id);
                if (item != null)
                {
                    //TODO: News berücksichtigen
                    var usedCount = 0;
                    if(item.IsCurrent)
                        usedCount += 1;

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

            return Json(batchResult);
        }
    }
}