using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Security.Cryptography;
using System.Text;
using Vinno.vCloud.Common.Storage.ObjectStorageInfo;

namespace Vinno.vCloud.Disk.UFile
{
    public class UploadHelper
    {
        private static StorageUploadConfig _cloudStorageConfig;

        public static void Init()
        {
            var ufileUploaderConfig =
        "{\n"
     + "  \"UrlBucket\": \"" + "http://flyinsono-test.cn-bj.ufileos.com/" + "\",\n"
     + "  \"StorageUrl\": \"\",\n"
     + "  \"Heads\": {\n"
     + "    \"UserAgent\": {\n"
     + "      \"ProductInfoHeaderValue\": {\n"
     + "        \"ProductName\": \"UCloudCSharp\",\n"
     + "        \"Version\": \"1.0.2\"\n"
     + "      }\n"
     + "    },\n"
     + "    \"RequestHeads\": [\n"
     + "      {\n"
     + "        \"HeadKey\": \"X-Ufile-Storage-Class\",\n"
     + "        \"HeadValue\": \"Standard\"\n"
     + "      }\n"
     + "    ]\n"
     + "  }\n"
     + "}\n";
           _cloudStorageConfig = JsonConvert.DeserializeObject<StorageUploadConfig>(ufileUploaderConfig);
        }

        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="requestUrl">文件下载地址</param>
        /// <returns></returns>
        public static byte[] DownloadFile(string requestUrl)
        {
            return ObjectStorageSingle.Instance.GetFile(requestUrl);
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="fileData"></param>
        /// <param name="requestUrl"></param>
        /// <param name="authorization"></param>
        /// <returns></returns>
        public static string UploadFile(byte[] fileData,string fileName, string mimeType, Action<double> progressCallback = null)
        {
            var contentType = MediaTypeHeaderValue.Parse(mimeType);
            var requestHeads = new Dictionary<string, string>();
            ProductInfoHeaderValue productInfoHeaderValue = null;
            var authorization = GetAuthorization(fileName);
            requestHeads.Add("Authorization", authorization);
            var requestUrl = _cloudStorageConfig.UrlBucket + fileName;
            var heads = _cloudStorageConfig.Heads;
            if (heads != null)
            {
                var httpHeads = heads.RequestHeads;
                foreach (var httpHead in httpHeads)
                {
                    requestHeads.Add(httpHead.HeadKey, httpHead.HeadValue);
                }
                var userAgent = heads.UserAgent;
                if (userAgent != null)
                {
                    var productInfoHeader = userAgent.ProductInfoHeaderValue;
                    productInfoHeaderValue = new ProductInfoHeaderValue(productInfoHeader.ProductName, productInfoHeader.Version);
                }
            }
            var result = ObjectStorageSingle.Instance.UploadFile(fileData, contentType, requestUrl, requestHeads, productInfoHeaderValue, progressCallback);
            if (result) 
            {
                return requestUrl;
            }
            return string.Empty;
        }

        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="requestUrl"></param>
        /// <param name="authorization"></param>
        /// <returns></returns>
        public static bool DeleteFile(string fileName)
        {
            var authorization = GetAuthorization(fileName);
            var requestUrl = _cloudStorageConfig.UrlBucket + fileName;
            return ObjectStorageSingle.Instance.DeleteFile(requestUrl, authorization);
        }

        private static string GetAuthorization(string fileName)
        {
            var contentType = string.Empty;
            if (fileName.LastIndexOf(".") > -1)
            {
                contentType = HttpClientHelper.GetMimeType(fileName.Substring(fileName.LastIndexOf(".")));
            }
            var authorization = string.Empty;
            authorization += "UCloud ";
            authorization += "TOKEN_2840e067-0874-4c72-81d3-baa43c7d510d";
            authorization += ":";
            var stringToSign = HttpMethod.Put.Method + "\n";
            stringToSign += "\n";
            stringToSign += contentType;
            stringToSign += "\n";
            stringToSign += "\n";
            stringToSign += $"/flyinsono-test/" + fileName;
            var hmac = new HMACSHA1(Encoding.ASCII.GetBytes("fd099d8b-200c-4a37-9b91-27875b0340e5"));
            var hashValue = hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign));
            var signature = Convert.ToBase64String(hashValue);
            return authorization + signature;
        }
    }
}