using System.Collections.Concurrent;
using System.Diagnostics;
using System.Numerics;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Microsoft.VisualBasic;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace WeChatSharp.Services;

public class WeChatUserInfoService
{
	private readonly HttpClient _httpClient;
	private readonly WeChatAccessTokenService accessTokenService;
	private readonly IWeChatSettings _weChatSettings;
	private readonly ILogger<WeChatUserInfoService> _logger;
	private readonly ConcurrentDictionary<string,WeChatUserInfo> weChatUserInfos = new();
	private readonly ConcurrentDictionary<string,WeChatUserInfo> codeBasedWeChatUserInfos = new();
	public WeChatUserInfoService(HttpClient httpClient, WeChatAccessTokenService accessTokenService, IWeChatSettings weChatSettings, ILogger<WeChatUserInfoService> logger)
	{
		_httpClient = httpClient;
		this.accessTokenService = accessTokenService;
		_weChatSettings = weChatSettings;
		_logger = logger;
	}
	public List<WeChatUserInfo> GetCachedWeChatUserInfos()
	{
		return weChatUserInfos.Values.ToList();
	}
	public async Task<WeChatUserInfo> GetUserInfoByCode(string code)
	{
		if (codeBasedWeChatUserInfos.TryGetValue(code, out var userInfo))
			return userInfo;

		var json = await _httpClient.GetStringAsync(
			$"""
https://api.weixin.qq.com/sns/oauth2/access_token?appid={_weChatSettings.AppId}&secret={_weChatSettings.AppSecret}&code={code}&grant_type=authorization_code
""");
		var jObject = JsonConvert.DeserializeObject<JObject>(json)!;
		if (jObject.TryGetValue("errcode", out var value))
		{
			var ErrorMessage = jObject["errmsg"]!.ToObject<string>();
			if (codeBasedWeChatUserInfos.TryGetValue(code, out userInfo))
			{
				return userInfo;
			}
			
			throw new InvalidOperationException(ErrorMessage);
		}

		if (jObject.TryGetValue("openid", out var _token) && jObject.TryGetValue("access_token",out var accessToken))
		{
			var openId = _token.ToObject<string>()!;
			userInfo = await GetUserInfoAsync(openId,accessToken.ToObject<string>()!);
			
			_logger.LogInformation($"已经获取到了{code}的用户:{userInfo.OpenId}");;
			_logger.LogInformation(json);

			codeBasedWeChatUserInfos.TryAdd(code, userInfo);
			return userInfo;
		}

		_logger.LogWarning("没有找到OpenId,获取的数据为;");
		_logger.LogWarning(json);
		throw new InvalidOperationException("无效的Code");
	}

	public async Task<WeChatUserInfo> GetUserInfoAsync(string openId,string accessToken=default!)
	{
		if(weChatUserInfos.TryGetValue(openId,out var userInfo))
			return userInfo;
		userInfo =await GetWeChatUserInfoFromServer(openId,accessToken);
		weChatUserInfos.TryAdd(openId,userInfo);
		return userInfo;
	}
	private async Task<WeChatUserInfo> GetWeChatUserInfoFromServer(string openId,string _accessToken=default!)
	{
		var accessToken = _accessToken;
		string url;
		if (string.IsNullOrEmpty(accessToken))
		{
			accessToken = await accessTokenService.GetAccessTokenAsync();
			url = $"https://api.weixin.qq.com/cgi-bin/user/info?access_token={accessToken}&openid={openId}&lang=zh_CN";
		}
		else
		{
			url = $"https://api.weixin.qq.com/sns/userinfo?access_token={accessToken}&openid={openId}&lang=zh_CN";
		}
		var json = await _httpClient.GetStringAsync(url);
		var jObject = JsonConvert.DeserializeObject<JObject>(json)!;

		if (jObject.ContainsKey("errcode"))
		{
			Console.WriteLine(jObject);
		}
		
		var weChatUserInfo = JsonConvert.DeserializeObject<WeChatUserInfo>(json);
		return weChatUserInfo;
	}
}