using BBWY.Common.Extensions;
using BBWY.Common.Http;
using BBWY.Common.Models;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;
using Yitter.IdGenerator;

namespace BBWY.Server.Business
{
    public class DingDingBusiness : BaseBusiness, IDenpendency
    {
        private RestApiService restApiService;

        public DingDingBusiness(IFreeSql fsql, NLogManager nLogManager, IIdGenerator idGenerator, RestApiService restApiService, IEnumerable<PlatformSDKBusiness> platformSDKBusinessList) : base(fsql, nLogManager, idGenerator, platformSDKBusinessList)
        {
            this.restApiService = restApiService;
        }

        public void SendDingDingBotMessage(string secret, string webHook, string content)
        {
            var timestamp = DateTime.Now.DateTimeToStamp();
            var stringToSign = timestamp + "\n" + secret;
            var sign = EncryptWithSHA256(stringToSign, secret);
            var url = $"{webHook}&timestamp={timestamp}&sign={sign}";
            var result = restApiService.SendRequest(url, string.Empty, new
            {
                msgtype = "text",
                text = new
                {
                    content = content
                }
            }, null, HttpMethod.Post);
            if (result.StatusCode != System.Net.HttpStatusCode.OK)
                throw new Exception($"发送钉钉机器人消息失败 {result.Content}");
        }

        /// <summary>
        /// Base64 SHA256
        /// </summary>
        /// <param name="data">待加密数据</param>
        /// <param name="secret">密钥</param>
        /// <returns></returns>
        private string EncryptWithSHA256(string data, string secret)
        {
            secret = secret ?? "";

            // 1、string 转换成 utf-8 的byte[]
            var encoding = Encoding.UTF8;
            byte[] keyByte = encoding.GetBytes(secret);
            byte[] dataBytes = encoding.GetBytes(data);

            // 2、 HMACSHA256加密
            using (var hmac256 = new HMACSHA256(keyByte))
            {
                byte[] hashData = hmac256.ComputeHash(dataBytes);
                // 3、转换成base64
                var base64Str = Convert.ToBase64String(hashData);
                // 4、urlEncode编码
                return System.Web.HttpUtility.UrlEncode(base64Str, Encoding.UTF8);
            }
        }
    }
}