using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Authorization;

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

using AyaNova.Models;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Biz;
using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using Newtonsoft.Json.Linq;
using System.Linq;
using AyaNova.Util;



namespace AyaNova.Api.Controllers
{

    /// <summary>
    /// Logo controller
    /// </summary>
    [ApiController]
    [ApiVersion("8.0")]
    [Route("api/v{version:apiVersion}/Logo")]
    [Produces("application/json")]
    [Authorize]
    public class LogoController : ControllerBase
    {
        private readonly AyContext ct;
        private readonly ILogger<LogoController> log;
        private readonly ApiServerState serverState;


        /// <summary>
        /// ctor
        /// </summary>
        /// <param name="dbcontext"></param>
        /// <param name="logger"></param>
        /// <param name="apiServerState"></param>  
        public LogoController(AyContext dbcontext, ILogger<LogoController> logger, ApiServerState apiServerState)
        {
            ct = dbcontext;
            log = logger;
            serverState = apiServerState;
        }





        /// <summary>
        /// Get Logo 
        /// </summary>
        /// <param name="size">One of "small", "medium", "large"</param>
        /// <returns>A single Logo and it's values</returns>
        [AllowAnonymous]
        [HttpGet("{size}")]
        public async Task<IActionResult> DownloadLogo([FromRoute] string size)
        {
            if (serverState.IsClosed)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));


            if (!ModelState.IsValid)
            {
                return BadRequest(new ApiErrorResponse(ModelState));
            }


            

            var o = await ct.Logo.Include(z => z.LogoItems).SingleOrDefaultAsync(z => z.Id == id);

            //turn into correct format and then send as file
            if (o == null)
            {
                return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            }
            var asText = Newtonsoft.Json.JsonConvert.SerializeObject(
                o,
                Newtonsoft.Json.Formatting.None,
                new JsonSerializerSettings { ContractResolver = new ShouldSerializeContractResolver(new string[] { "Concurrency", "Id", "LogoId" }) });
            var bytes = System.Text.Encoding.UTF8.GetBytes(asText);
            var file = new FileContentResult(bytes, "application/octet-stream");
            file.FileDownloadName = Util.FileUtil.StringToSafeFileName(o.Name) + ".json";
            return file;
        }


        public class ShouldSerializeContractResolver : DefaultContractResolver
        {
            private readonly IEnumerable<string> _excludePropertyNames;

            public ShouldSerializeContractResolver(IEnumerable<string> excludePropertyNames)
            {
                _excludePropertyNames = excludePropertyNames;
            }

            protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
            {
                IList<JsonProperty> properties = base.CreateProperties(type, memberSerialization);

                // only serializer properties that start with the specified character
                properties =
                    properties.Where(p => !_excludePropertyNames.Any(p2 => p2 == p.PropertyName)).ToList();

                return properties;
            }
        }



        /// <summary>
        /// Upload Logo
        /// Max 15mb total
        /// </summary>
        /// <param name="size">One of "small", "medium", "large"</param>
        /// <returns>Accepted</returns>
        [Authorize]
        [HttpPost("{size}")]
        [DisableFormValueModelBinding]
        [RequestSizeLimit(15000000)]//currently export file is 200kb * 50 maximum at a time = 15mb  https://github.com/aspnet/Announcements/issues/267
        public async Task<IActionResult> UploadAsync([FromRoute] string size)
        {
           
            //https://docs.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-3.1#upload-small-files-with-buffered-model-binding-to-a-database

            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));


            // AyaTypeId attachToObject = null;
            ApiUploadProcessor.ApiUploadedFilesResult uploadFormData = null;
            try
            {
                if (!MultipartRequestHelper.IsMultipartContentType(Request.ContentType))
                    return BadRequest(new ApiErrorResponse(ApiErrorCode.INVALID_OPERATION, null, $"Expected a multipart request, but got {Request.ContentType}"));

                //Save uploads to disk under temporary file names until we decide how to handle them
                uploadFormData = await ApiUploadProcessor.ProcessUploadAsync(HttpContext);

                bool badRequest = false;
                string UploadObjectType = string.Empty;
                string UploadObjectId = string.Empty;
                string errorMessage = string.Empty;
                string Notes = string.Empty;
                List<UploadFileData> FileData = new List<UploadFileData>();

                if (
                !uploadFormData.FormFieldData.ContainsKey("FileData"))//only filedata is required
                {
                    badRequest = true;
                    errorMessage = "Missing required FormFieldData value: FileData";
                }
                if (!badRequest)
                {
                    if (uploadFormData.FormFieldData.ContainsKey("ObjectType"))
                        UploadObjectType = uploadFormData.FormFieldData["ObjectType"].ToString();
                    if (uploadFormData.FormFieldData.ContainsKey("ObjectId"))
                        UploadObjectId = uploadFormData.FormFieldData["ObjectId"].ToString();
                    if (uploadFormData.FormFieldData.ContainsKey("Notes"))
                        Notes = uploadFormData.FormFieldData["Notes"].ToString();
                    //fileData in JSON stringify format which contains the actual last modified dates etc
                    //"[{\"name\":\"Client.csv\",\"lastModified\":1582822079618},{\"name\":\"wmi4fu06nrs41.jpg\",\"lastModified\":1586900220990}]"
                    FileData = Newtonsoft.Json.JsonConvert.DeserializeObject<List<UploadFileData>>(uploadFormData.FormFieldData["FileData"].ToString());

                }


                //  long UserId = UserIdFromContext.Id(HttpContext.Items);
                //Instantiate the business object handler
                LogoBiz biz = LogoBiz.GetBiz(ct, HttpContext);


                //We have our files now can parse and insert into db
                if (uploadFormData.UploadedFiles.Count > 0)
                {
                    //deserialize each file and import
                    foreach (UploadedFileInfo a in uploadFormData.UploadedFiles)
                    {
                        JObject o = JObject.Parse(System.IO.File.ReadAllText(a.InitialUploadedPathName));
                        if (!await biz.ImportAsync(o))
                        {
                            //delete all the files temporarily uploaded and return bad request
                            DeleteTempUploadFile(uploadFormData);
                            return BadRequest(new ApiErrorResponse(biz.Errors));
                        }
                    }
                }
            }
            catch (System.IO.InvalidDataException ex)
            {
                return BadRequest(new ApiErrorResponse(ApiErrorCode.INVALID_OPERATION, null, ex.Message));
            }
            finally
            {
                //delete all the files temporarily uploaded and return bad request

                DeleteTempUploadFile(uploadFormData);
            }

            //Return the list of attachment ids and filenames
            return Accepted();
        }


        private static void DeleteTempUploadFile(ApiUploadProcessor.ApiUploadedFilesResult uploadFormData)
        {
            if (uploadFormData.UploadedFiles.Count > 0)
            {
                foreach (UploadedFileInfo a in uploadFormData.UploadedFiles)
                {
                    System.IO.File.Delete(a.InitialUploadedPathName);
                }
            }
        }



    }
}