using learun.util;
using System;
using System.Threading.Tasks;

namespace learun.wechat
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.11.06
	/// 描 述：操作请求基础类
	/// </summary>
	public abstract class OperationRequestBase<T, THttp> : ISend<T>
			where T : OperationResultsBase, new()
			where THttp : IHttpSend, new()
	{
		/// <summary>
		///
		/// </summary>
		/// <returns></returns>
		protected abstract string Url();

		/// <summary>
		/// 视同attribute进行简单校验
		/// </summary>
		/// <param name="message"></param>
		/// <returns></returns>
		private bool Verify(out string message)
		{
			message = "";
			foreach (var pro in this.GetType().GetProperties())
			{
				var v = pro.GetCustomAttributes(typeof(IVerifyAttribute), true);

				foreach (IVerifyAttribute verify in pro.GetCustomAttributes(typeof(IVerifyAttribute), true))
				{
					if (!verify.Verify(pro.PropertyType, pro.GetValue(this), out message))
					{
						return false;
					}
				}
			}

			return true;
		}

		/// <summary>
		/// 格式化URL，替换Token
		/// </summary>
		/// <returns></returns>
		protected async Task<string> GetUrl()
		{
			if (await Token.IsTimeOut())
			{
				await Token.GetNewToken();
			}

			string url = Url();

			if (url.Contains("=ACCESS_TOKEN"))
			{
				url = url.Replace("=ACCESS_TOKEN", "=" + await Token.GetToken());
			}

			return url;
		}

		/// <summary>
		/// 发送
		/// </summary>
		/// <returns></returns>
		public async Task<T> Send()
		{
			string message;
			if (!Verify(out message))
			{
				throw new Exception(message);
			}

			//string result = new HttpHelper().Post(url, JsonConvert.SerializeObject(this), Encoding.UTF8, Encoding.UTF8);

			IHttpSend httpSend = new THttp();

			string result = await HttpSend(httpSend, await GetUrl());

			return GetDeserializeObject(result);
		}

		/// <summary>
		/// 开放平台发送
		/// </summary>
		/// <returns></returns>
		public async Task<T> OpenSend()
		{
			string message;
			if (!Verify(out message))
			{
				throw new Exception(message);
			}

			//string result = new HttpHelper().Post(url, JsonConvert.SerializeObject(this), Encoding.UTF8, Encoding.UTF8);

			IHttpSend httpSend = new THttp();

			string result = await HttpSend(httpSend, Url());

			return GetDeserializeObject(result);
		}

		/// <summary>
		/// 处理返回结果
		/// </summary>
		/// <param name="result"></param>
		/// <returns></returns>
		protected virtual T GetDeserializeObject(string result)
		{
			return result.ToObject<T>();
		}

		/// <summary>
		/// 处理发送请求
		/// </summary>
		/// <param name="httpSend"></param>
		/// <param name="url"></param>
		/// <returns></returns>
		protected virtual Task<string> HttpSend(IHttpSend httpSend, string url)
		{
			return httpSend.Send(url, this.ToJson());
		}
	}
}