using System.IO.Compression;

namespace DocumentFile.Service
{
    public interface IUploadService
    {
        Task<ReturnMsg> HandleUploadWordFile(IFormFile iFormFile,string code);

        Task<ReturnMsg> HandleUploadTemplateFile(IFormFile iFormFile, string code);

        Task<ReturnMsg> HandleUploadImageFile(IFormFile iFormFile, string code);

        //(string fileType, byte[] archiveData, string archiveName) DownloadFiles(string subDirectory);

    }

    public class UploadService : IUploadService
    {
        private readonly string _webRootPath;

        public UploadService()
        {
            _webRootPath = AppDomain.CurrentDomain.BaseDirectory;
        }

        /// <summary>
        /// 上传文件 辅助函数
        /// </summary>
        /// <param name="formFile"></param>
        /// <param name="tenant">文件夹客户标识</param>
        /// <param name="folder">文件夹分类标签</param>
        /// <param name="format"></param>
        /// <returns></returns>
        protected async virtual Task<ReturnMsg> HandleUploadFile(IFormFile formFile,string tenant, string folder, params string[] format)
        {
            ReturnMsg msg = new ReturnMsg();

            try
            {
                var extensionName = Path.GetExtension(formFile.FileName)?.ToLower().Trim(); //获取后缀名

                if (format != null && format.Length > 0 && !format.ToList().Contains(extensionName.ToLower()))
                {
                    msg.error = "请上传后缀名为：" + string.Join("、", format) + " 格式的文件";
                }
                else
                {
                    var path = $"/uploads/{tenant}/{folder}/{DateTime.Now:yyyyMMdd}";
                    var dir = this._webRootPath + path;
                    if (!Directory.Exists(dir))
                    {
                        Directory.CreateDirectory(dir);
                    }

                    var filename = CreateName(path,extensionName);                    
                    path += "/" + filename;
                                        
                    // 创建新文件
                    using var fs = File.Create(this._webRootPath+ path);
                    await formFile.CopyToAsync(fs);
                    // 清空缓冲区数据
                    fs.Flush();

                    msg.code = 1;
                    msg.url = path;
                }
            }
            catch (Exception er)
            {
                msg.code = -1;
                msg.error = "上传失败";
                NLogProvider.GetInstance().Error(er);
            }

            return msg;
        }

        /// <summary>
        /// 生成唯一的文件名
        /// </summary>
        /// <param name="path"></param>
        /// <param name="extensionName"></param>
        /// <returns></returns>
        private string CreateName(string path,string extensionName)
        {
            var filename = $"ZC_{DateTime.Now:HHmmssfff}" + extensionName;
            if (File.Exists(path + "/" + filename))
            {
                return CreateName(path, extensionName);
            }
            else
            {
                return filename;
            }
        }


        /// <summary>
        /// 上传word文件
        /// </summary>
        /// <param name="iFormFile"></param>
        /// <param name="format"></param>
        /// <returns></returns>
        public async virtual Task<ReturnMsg> HandleUploadWordFile(IFormFile iFormFile, string code)
            => await this.HandleUploadFile(iFormFile,code, "Instance", ".doc",".docx");

        /// <summary>
        /// 上传word模板文件
        /// </summary>
        /// <param name="iFormFile"></param>
        /// <param name="format"></param>
        /// <returns></returns>
        public async virtual Task<ReturnMsg> HandleUploadTemplateFile(IFormFile iFormFile, string code)
            => await this.HandleUploadFile(iFormFile, code, "Template", ".doc", ".docx");

        /// <summary>
        /// 上传图片
        /// </summary>
        /// <param name="iFormFile"></param>
        /// <param name="folder"></param>
        /// <returns></returns>
        public async virtual Task<ReturnMsg> HandleUploadImageFile(IFormFile iFormFile, string code)
            => await this.HandleUploadFile(iFormFile, code, "Photo", ".jpg", ".jpeg", ".png");
        /*, ".gif", ".jfif"*/

        ///// <summary>
        ///// 下载证书文件
        ///// 打包zip
        ///// </summary>
        ///// <param name="subDirectory"></param>
        ///// <returns></returns>
        //public (string fileType, byte[] archiveData, string archiveName) DownloadFiles(string path)
        //{
        //    using var memoryStream = new MemoryStream();
        //    using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
        //    {
        //        files.ForEach(file =>
        //        {
        //            var theFile = archive.CreateEntry(Path.GetFileName(file));
        //            using var binaryWriter = new BinaryWriter(theFile.Open());
        //            binaryWriter.Write(File.ReadAllBytes(file));
        //        });
        //    }

        //    return ("application/zip", memoryStream.ToArray(), zipName);
        //}

    }
}