using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using PaySharp.Alipay.Response;
using PaySharp.Core;
using PaySharp.Core.Exceptions;
using PaySharp.Core.Request;
using PaySharp.Core.Response;
using PaySharp.Core.Utils;

namespace PaySharp.Alipay
{
    internal static class SubmitProcess
    {
        private static string _gatewayUrl;

        internal static TResponse Execute<TModel, TResponse>(Merchant merchant, Request<TModel, TResponse> request, string gatewayUrl = null) where TResponse : IResponse
        {
            AddMerchant(merchant, request, gatewayUrl);

            var result = HttpUtil.Post(request.RequestUrl, request.GatewayData.ToUrl());

            var jObject = JObject.Parse(result);
            var jToken = jObject.First.First;
            var sign = jObject.Value<string>("sign");
            if (!string.IsNullOrEmpty(sign) &&
                !CheckSign(
                    jToken.ToString(Formatting.None),
                    sign,
                    merchant.CertEnvironment == null ? merchant.AlipayPublicKey : merchant.CertEnvironment.GetAlipayPublicKey(jObject.Value<string>("alipay_cert_sn")),
                    merchant.SignType
                )
            )
            {
                throw new GatewayException("签名验证失败");
            }

            var baseResponse = (BaseResponse)jToken.ToObject(typeof(TResponse));
            baseResponse.Raw = result;
            baseResponse.Sign = sign;
            baseResponse.Execute(merchant, request);
            return (TResponse)(object)baseResponse;
        }

        internal static TResponse SdkExecute<TModel, TResponse>(Merchant merchant, Request<TModel, TResponse> request, string gatewayUrl) where TResponse : IResponse
        {
            AddMerchant(merchant, request, gatewayUrl);

            return (TResponse)Activator.CreateInstance(typeof(TResponse), request);
        }

        private static void AddMerchant<TModel, TResponse>(Merchant merchant, Request<TModel, TResponse> request, string gatewayUrl) where TResponse : IResponse
        {
            if (!string.IsNullOrEmpty(gatewayUrl))
            {
                _gatewayUrl = gatewayUrl;
            }

            if (!request.RequestUrl.StartsWith("http"))
            {
                request.RequestUrl = _gatewayUrl + request.RequestUrl;
            }
            request.GatewayData.Add(merchant, StringCase.Snake);
            if (merchant.CertEnvironment != null)
            {
                request.GatewayData.Add("app_cert_sn", merchant.CertEnvironment.MerchantCertSN);
                request.GatewayData.Add("alipay_root_cert_sn", merchant.CertEnvironment.RootCertSN);
            }
            if (!string.IsNullOrEmpty(request.NotifyUrl))
            {
                request.GatewayData.Add("notify_url", request.NotifyUrl);
            }
            if (!string.IsNullOrEmpty(request.ReturnUrl))
            {
                request.GatewayData.Add("return_url", request.ReturnUrl);
            }
            request.GatewayData.Add("sign", BuildSign(request.GatewayData, merchant.Privatekey));
        }

        internal static string BuildSign(GatewayData gatewayData, string privatekey)
        {
            gatewayData.Remove("sign");
            return EncryptUtil.Sign(gatewayData.ToUrl(false), privatekey);
        }

        internal static bool CheckSign(string data, string sign, string alipayPublicKey, string signType)
        {
            return EncryptUtil.Verify(data, sign, alipayPublicKey);
        }
    }
}