using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Web;
using Microsoft.AspNetCore.Routing;

namespace Hncore.Infrastructure.AliYun
{
    public class Util
    {
        const string QUERY_SEPARATOR = "&";
        const string HEADER_SEPARATOR = "\n";

        const string AccessSecret = "r8FfRmoeWcCJyZSqqkQP2G3dKPPl2N ";
        private const string AccessKeyId = "LTAI4FmSkDSwFuXeLxsDB3jB";

        public static string CreateSign(Dictionary<string, string> data, string method = "GET")
        {
            var dic = new RouteValueDictionary(data);


            string[] array = dic.OrderBy(a => a.Key, StringComparer.Ordinal)
                .Select(a => PercentEncode(a.Key) + "=" + PercentEncode(a.Value.ToString())).ToArray();
            string dataStr = string.Join("&", array);
            string signStr = method + "&" + PercentEncode("/") + "&" + PercentEncode(dataStr);

            HMACSHA1 myhmacsha1 = new HMACSHA1(Encoding.UTF8.GetBytes(AccessSecret + "&"));
            byte[] byteArray = Encoding.UTF8.GetBytes(signStr);
            MemoryStream stream = new MemoryStream(byteArray);
            string signature = Convert.ToBase64String(myhmacsha1.ComputeHash(stream));

            return signature;
        }

        private static string PercentEncode(string value)
        {
            return UpperCaseUrlEncode(value)
                .Replace("+", "%20")
                .Replace("*", "%2A")
                .Replace("%7E", "~");
        }

        private static string UpperCaseUrlEncode(string s)
        {
            char[] temp = HttpUtility.UrlEncode(s).ToCharArray();
            for (int i = 0; i < temp.Length - 2; i++)
            {
                if (temp[i] == '%')
                {
                    temp[i + 1] = char.ToUpper(temp[i + 1]);
                    temp[i + 2] = char.ToUpper(temp[i + 2]);
                }
            }

            return new string(temp);
        }

        public static IDictionary<string, string> SortDictionary(Dictionary<string, string> dic)
        {
            IDictionary<string, string> sortedDictionary =
                new SortedDictionary<string, string>(dic, StringComparer.Ordinal);
            return sortedDictionary;
        }


        public static Dictionary<string, string> BuildCommonParam()
        {
            Dictionary<string, string> dic = new Dictionary<string, string>();

            dic.Add("AccessKeyId", AccessKeyId);
            dic.Add("Timestamp", DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ"));
            dic.Add("SignatureMethod", "HMAC-SHA1");
            dic.Add("SignatureVersion", "1.0");
            dic.Add("SignatureNonce", Guid.NewGuid().ToString());

            return dic;
        }
    }
}