using OAuthApp.Data;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Linq;
using System.Net.Http;
using System.Web;

namespace OAuthApp.Controllers
{
 public class WechatController : Controller
 {
 readonly HttpContext _httpContext;
 readonly AppDbContext _dbContext;

 const string Authorize_url = "https://open.weixin.qq.com/connect/oauth2/authorize";

 // 开放平台网站应用专用
 const string Authorize_url2 = "https://open.weixin.qq.com/connect/qrconnect";

 public WechatController(IHttpContextAccessor contextAccessor,
 AppDbContext dbContext)
 {
 _httpContext = contextAccessor.HttpContext;
 _dbContext = dbContext;
 }

 public const string default_scope = "snsapi_userinfo";

 [HttpGet]
 public ActionResult Authorize([FromQuery] string code, [FromQuery] long state, [FromQuery] string jxwechat)
 {
 var props = _dbContext.PropertySettings
 .Where(x => x.ChannelCode.Equals(ChannelCodes.App) && x.ChannelAppId == state).ToList();

 if (props.Count < 1)
 {
 return NotFound("请先配置应用");
 }

 var Prop_WechatClientID = props.FirstOrDefault(x => x.Name.Equals(PropKeyConst.WechatClientID));
 var Prop_WechatClientSecret = props.FirstOrDefault(x => x.Name.Equals(PropKeyConst.WechatClientSecret));
 var Prop_WechatScope = props.FirstOrDefault(x => x.Name.Equals(PropKeyConst.WechatScope));
 var Prop_WechatRedirectUri = props.FirstOrDefault(x => x.Name.Equals(PropKeyConst.WechatRedirectUri));

 if (Prop_WechatClientID == null ||
 Prop_WechatClientSecret == null ||
 Prop_WechatScope == null ||
 Prop_WechatRedirectUri == null)
 {
 return NotFound("请先配置应用");
 }

 var WechatClientID = Prop_WechatClientID.Value;
 var WechatClientSecret = Prop_WechatClientSecret.Value;
 var WechatScope = Prop_WechatScope.Value;
 var WechatRedirectUri = Prop_WechatRedirectUri.Value;

 if (string.IsNullOrWhiteSpace(code) && string.IsNullOrWhiteSpace(jxwechat))
 {
 var host = _httpContext.Request.Scheme + "://" + _httpContext.Request.Host.ToString();

 var redirect_uri = $"{host}/Wechat/Authorize";

 var queryStrings = $"appid={WechatClientID}&redirect_uri={redirect_uri}&response_type=code&scope={WechatScope}&state={state}#wechat_redirect";

 var redirectTo = string.Empty;

 if (WechatScope.Equals("snsapi_login"))
 {
 redirectTo = Authorize_url2 + "?" + queryStrings;
 }
 else
 {
 redirectTo = Authorize_url + "?" + queryStrings;
 }

 return new RedirectResult(redirectTo);
 }

 else
 {
 var OAuthorizeResult = GetAccessToken(WechatClientID, WechatClientSecret, code, WechatScope);

 var redirectTo = WechatRedirectUri + $"?id={state}&app_wechat={HttpUtility.UrlEncode(OAuthorizeResult)}";

 return new RedirectResult(redirectTo);
 }
 }

 private static string GetAccessToken(string client_id, string client_secret, string code, string scope)
 {
 var result = string.Empty;

 using (var hc = new HttpClient())
 {
 var url = $"https://api.weixin.qq.com/sns/oauth2/access_token?appid={client_id}&secret={client_secret}&code={code}&grant_type=authorization_code";

 result = hc.GetStringAsync(url).Result;
 }

 var responseJson = JsonConvert.DeserializeObject<JObject>(result);

 #region 报错
 if (responseJson["errcode"] != null && responseJson["errcode"].HasValues)
 {
 return responseJson["errcode"].Value<string>();
 }
 #endregion

 #region 如果scope是snsapi_userinfo 
 if (scope.Equals(default_scope))
 {
 var access_token = responseJson["access_token"].Value<string>();

 var openid = responseJson["openid"].Value<string>();

 using (var hc = new HttpClient())
 {
 var url = $"https://api.weixin.qq.com/sns/userinfo?access_token={access_token}&openid={openid}&lang=zh_CN";

 result = hc.GetStringAsync(url).Result;
 }

 responseJson = JsonConvert.DeserializeObject<JObject>(result);

 #region 报错
 if (responseJson["errcode"] != null && responseJson["errcode"].HasValues)
 {
 return responseJson["errcode"].Value<string>();
 }
 #endregion

 responseJson.Add("access_token", access_token);

 return JsonConvert.SerializeObject(responseJson);
 }
 #endregion

 //scope是snsapi_base
 return result;
 }



 }
}