using BaseModel.Models;
using System.Threading.Tasks;
using System.Web.UI;

namespace Wechat.PayAPI
{
    /// <summary>
    /// 支付结果通知回调处理类
    /// 负责接收微信支付后台发送的支付结果并对订单有效性进行验证，将验证结果反馈给微信支付后台
    /// </summary>
    public class ResultNotify:Notify
    {
        public ResultNotify(Page page):base(page)
        {
        }

        public override async Task ProcessNotify(WxPayConfig config)
        {
            WxPayData notifyData = GetNotifyData();

            //检查支付结果中transaction_id是否存在
            if (!notifyData.IsSet("transaction_id"))
            {
                //若transaction_id不存在，则立即返回结果给微信支付后台
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "FAIL");
                res.SetValue("return_msg", "支付结果中微信订单号不存在");
                Log.Error(this.GetType().ToString(), "The Pay result is error : " + res.ToXml());
                page.Response.Write(res.ToXml());
                page.Response.End();
            }

            string transaction_id = notifyData.GetValue("transaction_id").ToString();

            //查询订单，判断订单真实性
            if ((await QueryOrder(transaction_id, null)) == false)
            {
                //若订单查询失败，则立即返回结果给微信支付后台
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "FAIL");
                res.SetValue("return_msg", "订单查询失败");
                Log.Error(this.GetType().ToString(), "Order query failure : " + res.ToXml());
                page.Response.Write(res.ToXml());
                page.Response.End();
            }
            //查询订单成功
            else
            {
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "SUCCESS");
                res.SetValue("return_msg", "OK");
                Log.Info(this.GetType().ToString(), "order query success : " + res.ToXml());
                page.Response.Write(res.ToXml());
                page.Response.End();
            }
        }

        //查询订单
        private async Task<bool> QueryOrder(string transaction_id, WxPayConfig config)
        {
            WxPayData req = new WxPayData();
            req.SetValue("transaction_id", transaction_id);
            WxPayData res = await WxPayApi.OrderQuery(req, config);
            if (res.GetValue("return_code").ToString() == "SUCCESS" &&
                res.GetValue("result_code").ToString() == "SUCCESS")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}