using Aliyun.OSS;
using QWPlatform.SystemLibrary.LogManager;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace PMS.Plugins.AliFileUpload
{
    public class AliFileUpload
    {
        private static Logger Log = Logger.Instance;
        private static string OSSAccessKeyId = QWPlatform.SystemLibrary.Security.DESEncrypt.DesDecrypt(ConfigurationManager.AppSettings["OSSAccessKeyId"].Trim());//OSSAccessKeyId
        private static string OSSAccessKeySecret = QWPlatform.SystemLibrary.Security.DESEncrypt.DesDecrypt(ConfigurationManager.AppSettings["OSSAccessKeySecret"].Trim());//OSSAccessKeySecret
        private static string _http = "https://oss-cn-beijing.aliyuncs.com";// 主机名oss-cn-beijing.aliyuncs.com
        private const string _bucketName = "ikuaizi";//Bucket名称
                                                     //private static string _http = QWPlatform.SystemLibrary.Security.DESEncrypt.DesDecrypt(ConfigurationManager.AppSettings["_http"].Trim());
                                                     //private static string _bucketName = QWPlatform.SystemLibrary.Security.DESEncrypt.DesDecrypt(ConfigurationManager.AppSettings["_bucketName"].Trim());


        /// <summary>
        /// 初始化OSS实例对象
        /// </summary>
        public static class OssManager
        {
            private static OssClient ossClient;

            public static OssClient GetInstance()
            {
                if (ossClient == null)
                {
                    ossClient = new OssClient(_http, OSSAccessKeyId, OSSAccessKeySecret);
                }
                return ossClient;
            }
        }

        #region 上传文件
        /// <summary>
        /// 以文件流的形式上传文件oss
        /// </summary>
        /// <param name="file">HttpPostedFile</param>
        /// <param name="type">上传类别</param>
        /// <param name="uploadingPerson">上传人</param>
        /// <param name="suffixName">后缀名</param>
        /// <returns>返回阿里的文件名称</returns>
        public static string PutObjectFileStream(HttpFileCollectionBase Files)
        {
            string keyname = "";
            var selectUrl = "";
            try
            {
                var uploadFile = Files[0];
                //获得一个OssClient实例
                OssClient _client = OssManager.GetInstance();
                Random ra = new Random();
                var time=  DateTime.Now.ToString("yyyyHHddHHmmss") + ra.Next().ToString();
                keyname =  "问题管理系统/" + time+uploadFile.FileName;
                ObjectMetadata metadata = new ObjectMetadata();
                // 可以设定自定义的metadata。
                metadata.ContentType = uploadFile.ContentType;
                using (var fu = uploadFile.InputStream)
                {
                    var rest = _client.PutObject(_bucketName, keyname, fu, metadata);
                    if (rest.HttpStatusCode == System.Net.HttpStatusCode.OK)
                    {
                        Log.Info("阿里文件上传成功");
                         selectUrl = SelcetFileSddress(keyname);
                    }
                }
                
            }
            catch (Exception ex)
            {
                Log.Error("阿里上传文件异常;" + ex.Message);
            }
            return selectUrl;
        }

        #endregion 上传文件

        #region 文件查询

 

        /// <summary>
        /// 查询阿里的访问文件地址
        /// </summary>
        /// <param name="name">阿里文件地址</param>
        /// <returns></returns>
        public static string SelcetFileSddress(string name)
        {
            try
            {
                OssClient _client = OssManager.GetInstance();
                //失效时间
                var req = new GeneratePresignedUriRequest(_bucketName, name, SignHttpMethod.Get)
                {
                    Expiration = DateTime.Now.AddHours(1),
                };
                var url = _client.GeneratePresignedUri(req).ToString();
                Log.Info(url);
                url = "https://ikuaizi.oss-cn-beijing.aliyuncs.com/" + name;
                return url;
            }
            catch (Exception ex)
            {
                Log.Error("获取地址失败" + ex.Message);
            }
            return "";
        }

        #endregion 文件查询

    

     

        #region 私有方法
        /// <summary>
        /// 获取文件名称
        /// </summary>
        /// <param name="uploadingPerson">上传人id</param>
        /// <returns></returns>
        private static string GeneratingFileName(string uploadingPerson)
        {
            if (string.IsNullOrEmpty(uploadingPerson))
            {
                string raw = Guid.NewGuid().ToString("N").ToUpper();//生成raw16
                uploadingPerson = raw;
            }
            Random ra = new Random();
            return uploadingPerson + "_" + DateTime.Now.ToString("yyyyHHddHHmmss") + ra.Next().ToString();
        }

    

        #endregion 私有方法
    }
}