using Microsoft.Extensions.Options;
using OrBit.MesFileServiceNode.Host.Model;
using System.Security.Cryptography;

namespace OrBit.MesFileServiceNode.Host.Middleware
{
    public class UploadFileMiddleware : IMiddleware
    {
        private NodeConfig _nodeConfig;
        private const int BUF_SIZE = 4096;

        public UploadFileMiddleware(IOptions<NodeConfig> config)
        {
            _nodeConfig = config.Value;
        }

        /// <summary>
        /// 获取客户Ip
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public string GetClientUserIp(HttpContext context)
        {
            var ip = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (string.IsNullOrEmpty(ip))
            {
                ip = context.Connection.RemoteIpAddress?.ToString();
            }

            return ip;
        }

        public async Task InvokeAsync(HttpContext context, RequestDelegate next)
        {
            //ip限制
            var clientIp = GetClientUserIp(context);
            if (_nodeConfig.AllowIPs != null && _nodeConfig.AllowIPs.Count >0  && !_nodeConfig.AllowIPs.Contains(clientIp))
            {
                context.Response.StatusCode = 200;
                await context.Response.WriteAsync(ExecutionResult.Failed($"IP:{clientIp}不在白名单内").ToJson());
                return;
            }

            var contentType = context.Request.Headers["Content-Type"].ToString();
            //string ConsumerId = context.Request.Headers["ConsumerId"].ToString();
            //var Authorization = context.Request.Headers["Authorization"];
            //var authoResult= await uplodFileService.Authorization(ConsumerId, Authorization);
            //if(authoResult.code== ExecutionState.FAIL)
            //{
            //    context.Response.StatusCode = 401;
            //    await context.Response.WriteAsJsonAsync(ExecutionResult.Failed("认证失败"));
            //    return;
            //}
            //var interfaceConsumer = authoResult.data.ObjCast(new { UploadFolder = "", app = "" });

            var app = context.Request.Headers["app"];
            var UploadFolder = context.Request.Headers["UploadFolder"];
            if (string.IsNullOrEmpty(app))
            {
                context.Response.StatusCode = 200;
                await context.Response.WriteAsJsonAsync(ExecutionResult.Failed("app不能为空"));
                return;
            }
            if (string.IsNullOrEmpty(UploadFolder))
            {
                context.Response.StatusCode = 200;
                await context.Response.WriteAsJsonAsync(ExecutionResult.Failed("UploadFolder不能为空"));
                return;
            }
            List<UploadFileInfo> files = new List<UploadFileInfo>();
            if (contentType.Contains("multipart/form-data"))
            {
                //byte[] buffer = new byte[BUF_SIZE];
                var now = DateTime.Now;
                var year = now.ToString("yyyy");
                var mmdd = now.ToString("MMdd");
                try
                {
                    foreach (var s in context.Request.Form.Files)
                    {
                        var tmpfile = new UploadFileInfo
                        {
                            ContentType = s.ContentType,
                            ExtensionName = Path.GetExtension(s.FileName),
                            FileName = s.FileName,
                            Length = s.Length
                        };
                        var folder = Path.Combine(_nodeConfig.PhysicalPath, app, UploadFolder, year, mmdd);

                        if (!Directory.Exists(folder))
                        {
                            Directory.CreateDirectory(folder);
                        }
                        var tmpFileName = Guid.NewGuid().ToString("n") + tmpfile.ExtensionName;
                        var filePath = Path.Combine(folder, tmpFileName);
                        // tmpfile.HashID = s.GetHashCode().ToString();
                        using (var fileStream = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
                        {
                            s.CopyTo(fileStream);
                            fileStream.Flush(true);
                        }
                        tmpfile.StoragePath = filePath;
                        tmpfile.FileUrl = $"{_nodeConfig.Domain}{_nodeConfig.VirtualPath}/{app}/{UploadFolder}/{year}/{mmdd}/{tmpFileName}";
                        tmpfile.HashID = s.Name;
                        files.Add(tmpfile);
                    }
                }
                catch (Exception ex)
                {
                    context.Response.StatusCode = 200;
                    await context.Response.WriteAsJsonAsync(ExecutionResult.Failed(ex.Message));
                    return;
                }

                if (files.Count > 0)
                {
                    context.Response.StatusCode = 200;
                    await context.Response.WriteAsJsonAsync(ExecutionResult.Success("文件上传成功", files));
                    return;
                }
            }
            else
            {
                context.Response.StatusCode = 400;
                await context.Response.WriteAsync(ExecutionResult.Failed("ContentType内容必须是multipart/form-data").ToJson());
                return;
            }

            //var file = await context.Request.StreamFilesModel(async x =>
            //{
            //    using (var stream = x.OpenReadStream())
            //        while (await stream.ReadAsync(buffer, 0, buffer.Length) > 0) ;
            //    files.Add(x);
            //});
        }
    }
}