using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Asp.Versioning;
using AutoMapper;
using gehGassi.Common.Data;
using gehGassi.Core.Interfaces;
using gehGassi.Domain.Common;
using gehGassi.Domain.News;
using gehGassi.Dto;
using gehGassi.Dto.Common;
using gehGassi.Dto.News;
using gehGassi.Web.Auth;
using gehGassi.Web.Helper;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.TagHelpers.Cache;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using NuGet.Protocol;
using NuGet.Protocol.Plugins;

namespace gehGassi.Web.Controllers.Api
{
    /// <summary>
    /// Controller der Zugriff auf News via API ermöglicht
    /// </summary>
    [Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme)]
    [ApiController]
    [ApiVersion(1)]
    [Route("api/news")]
    [Route("api/v{v:apiVersion}/news")]
    public class ApiNewsController : ApiBaseController
    {
        private readonly ILogger<ApiNewsController> _logger;
        private readonly INewsCategoryService _newsCategoryService;
        private readonly INewsService _newsService;
        private readonly IGeoLocationService _geoLocationService;

        /// <summary>
        /// Erstellt eine Instanz
        /// </summary>
        /// <param name="mapper">Instanz eines IMapper</param>
        /// <param name="logger">Instanz eines ILogger</param>
        /// <param name="localizationOptions">Instanz von LocalizationOptions</param>
        /// <param name="newsCategoryService">Instanz eines INewsCategoryService</param>
        /// <param name="newsService">Instanz eines INewsService</param>
        /// <param name="appUserService">Instanz eines IDogOwnerService</param>
        /// <param name="geoLocationService">Instanz eines IGeoLocationService</param>
        public ApiNewsController(IMapper mapper, ILogger<ApiNewsController> logger, IOptions<LocalizationOptions> localizationOptions, INewsCategoryService newsCategoryService, INewsService newsService, 
            IAppUserService appUserService, IGeoLocationService geoLocationService) : base(mapper, localizationOptions, appUserService)
        {
            _logger = logger;
            _newsCategoryService = newsCategoryService;
            _newsService = newsService;
            _geoLocationService = geoLocationService;
        }

        /// <summary>
        /// Gibt eine Liste von News-Kategorien für die Synchronisierung mit der App zurück
        /// </summary>
        /// <param name="lastUpdate">Letztes Update oder null, wenn noch keines</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <returns>HTTP 200 wenn erfolgreich</returns>
        [Route("GetCategories")]
        [HttpGet]
        public async Task<IActionResult> GetCategories(DateTimeOffset? lastUpdate, string language)
        {
            var clientOffset = GetClientDateOffset();

            if (User?.Identity != null && User.Identity.IsAuthenticated)
            {
                var categories = await _newsCategoryService.GetForSyncAsync(lastUpdate, language, LocalizationOptions.Value.DefaultCulture);
                var categoriesDto = Mapper.Map<List<NewsCategoryDto>>(categories);
                foreach (var newsCategoryDto in categoriesDto)
                {
                    newsCategoryDto.Language = language;
                }

                return Ok(categoriesDto);
            }
            return NotFound(CommunicationErrors.Common_NotFound);
        }

        /// <summary>
        /// Gibt eine Liste von News-Meldungen zurück
        /// </summary>
        /// <param name="model">Abfragemodel</param>
        /// <returns>HTTP 200 wenn erfolgreich</returns>
        [Route("GetNews")]
        [HttpPost]
        public async Task<IActionResult> GetNews(NewsQueryDto model)
        {
            var clientOffset = GetClientDateOffset();

            if (User?.Identity != null && User.Identity.IsAuthenticated)
            {
                var response = new ListResponseDto<NewsDto>();

                //Geodaten holen.
                //Entweder wurde lat und lng geliefert, oder wir müssen über den benutzer und den app-mode entscheiden
                var (country, state) = await GetGeoDataAsync(model);

                //Wir müssen nach Geomode der News vorgehen. Zuerst alle ohne Geo-Beschränkung, dann jene mit Land, dann jene mit Land und Bundesland und dann jene mit Lat & Lng
                var visibility = model.AppMode == AppModeDto.DogOwner ? NewsVisibility.DogOwners : NewsVisibility.DogWalkers;

                var queryResult = await _newsService.GetForAppAsync(visibility, model.CategoryId, country, state, model.Location.Lat, model.Location.Lng, model.Language, LocalizationOptions.Value.DefaultCulture, model.Skip, model.Take);

                response.Total = queryResult.total;

                var dtoList = Mapper.Map<List<NewsDto>>(queryResult.list);
                var baseAddress = GetBaseAddress();
                foreach (var newsDto in dtoList)
                {
                    newsDto.Headline = newsDto.Headline.Ellipsis(97);
                    if (!string.IsNullOrWhiteSpace(newsDto.Image))
                        newsDto.Image = $"{baseAddress}/file/documents/thumbnails/{200}/{newsDto.Image}";
                    newsDto.Url = $"{baseAddress}/{LocalizationOptions.Value.DefaultCulture}/News/show?nid={newsDto.Id}";
                }

                response.List = dtoList;
                response.Take = model.Take;
                response.Skip = model.Skip;

                return Ok(response);
            }
            return NotFound(CommunicationErrors.Common_NotFound);
        }
    }
}