using Castle.DynamicProxy;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.SignalR;
using Newtonsoft.Json;
using StackExchange.Profiling;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using WIDESEAWCS_Core.Helper;
using WIDESEAWCS_Core.LogHelper;

namespace WIDESEAWCS_Core.AOP
{
    /// <summary>
	/// 拦截器BlogLogAOP 继承IInterceptor接口
	/// </summary>
	public class LogAOP : IInterceptor
    {
        private readonly IHttpContextAccessor _accessor;

        public LogAOP(IHttpContextAccessor accessor)
        {
            _accessor = accessor;
        }

        /// <summary>
        /// 实例化IInterceptor唯一方法 
        /// </summary>
        /// <param name="invocation">包含被拦截方法的信息</param>
        public void Intercept(IInvocation invocation)
        {
            string UserName = _accessor.HttpContext?.User?.Identity?.Name;
            string json;
            try
            {
                if (invocation.Arguments.Any())
                {
                    json = JsonConvert.SerializeObject(invocation.Arguments);
                }
                else
                {
                    json = "无参数";
                }
            }
            catch (Exception ex)
            {
                json = "无法序列化，可能是兰姆达表达式等原因造成，按照框架优化代码" + ex.ToString();
            }

            DateTime startTime = DateTime.Now;
            AOPLogInfo apiLogAopInfo = new AOPLogInfo
            {
                RequestTime = startTime.ToString("yyyy-MM-dd hh:mm:ss fff"),
                OpUserName = "【当前操作用户】：" + UserName,
                RequestMethodName = "【当前执行方法】：" + invocation.Method.Name,
                RequestParamsName = "【携带的参数有】：" + string.Join(", ", invocation.Arguments.Select(a => (a ?? "").ToString()).ToArray()),
                RequestParamsData = json
            };

            var dataIntercept = $"";

            try
            {
                MiniProfiler.Current.Step($"执行{invocation.InvocationTarget}.{invocation.Method.Name}()方法 -> ");
                //在被拦截的方法执行完毕后 继续执行当前方法，注意是被拦截的是异步的
                invocation.Proceed();

                // 异步获取异常，先执行
                if (IsAsyncMethod(invocation.Method))
                {
                    if (invocation.Method.ReturnType == typeof(Task))
                    {
                        invocation.ReturnValue = InternalAsyncHelper.AwaitTaskWithPostActionAndFinally(
                            (Task)invocation.ReturnValue,
                            async () => await SuccessAction(invocation, apiLogAopInfo, startTime), /*成功时执行*/
                            ex =>
                            {
                                LogEx(ex, apiLogAopInfo);
                            });
                    }
                    else
                    {
                        invocation.ReturnValue = InternalAsyncHelper.CallAwaitTaskWithPostActionAndFinallyAndGetResult(
                            invocation.Method.ReturnType.GenericTypeArguments[0],
                            invocation.ReturnValue,
                            async (o) => await SuccessAction(invocation, apiLogAopInfo, startTime, o), /*成功时执行*/
                            ex =>
                            {
                                LogEx(ex, apiLogAopInfo);
                            });
                    }
                }
                else
                {
                    // 同步1
                    string jsonResult;
                    try
                    {
                        jsonResult = JsonConvert.SerializeObject(invocation.ReturnValue);
                    }
                    catch (Exception ex)
                    {
                        jsonResult = "无法序列化，可能是兰姆达表达式等原因造成，按照框架优化代码" + ex.ToString();
                    }

                    var type = invocation.Method.ReturnType;
                    var resultProperty = type.GetProperty("Result");
                    DateTime endTime = DateTime.Now;
                    string ResponseTime = (endTime - startTime).Milliseconds.ToString();
                    apiLogAopInfo.ResponseTime = endTime.ToString("yyyy-MM-dd hh:mm:ss fff");
                    apiLogAopInfo.ResponseIntervalTime = ResponseTime + "ms";
                    apiLogAopInfo.ResponseJsonData = jsonResult;
                    Parallel.For(0, 1, e =>
                    {
                        LogLock.OutLogAOP("AOPLog", new string[] { apiLogAopInfo.GetType().ToString(), JsonConvert.SerializeObject(apiLogAopInfo) });
                    });
                }
            }
            catch (Exception ex) // 同步2
            {
                LogEx(ex, apiLogAopInfo);
                throw;
            }
        }

        private async Task SuccessAction(IInvocation invocation, AOPLogInfo apiLogAopInfo, DateTime startTime, object o = null)
        {
            DateTime endTime = DateTime.Now;
            string ResponseTime = (endTime - startTime).Milliseconds.ToString();
            apiLogAopInfo.ResponseTime = endTime.ToString("yyyy-MM-dd hh:mm:ss fff");
            apiLogAopInfo.ResponseIntervalTime = ResponseTime + "ms";
            apiLogAopInfo.ResponseJsonData = JsonConvert.SerializeObject(o);

            await Task.Run(() =>
            {
                Parallel.For(0, 1, e =>
                {
                    LogLock.OutLogAOP("AOPLog", new string[] { apiLogAopInfo.GetType().ToString(), JsonConvert.SerializeObject(apiLogAopInfo) });
                });
            });
        }

        private void LogEx(Exception ex, AOPLogInfo dataIntercept)
        {
            if (ex != null)
            {
                //执行的 service 中，收录异常
                MiniProfiler.Current.CustomTiming("Errors：", ex.Message);
                //执行的 service 中，捕获异常
                AOPLogExInfo apiLogAopExInfo = new AOPLogExInfo
                {
                    ExMessage = ex.Message,
                    InnerException = "InnerException-内部异常:\r\n" + (ex.InnerException == null ? "" : ex.InnerException.InnerException.ToString()) +
                                     "\r\nStackTrace-堆栈跟踪:\r\n" + (ex.StackTrace == null ? "" : ex.StackTrace.ToString()),
                    ApiLogAopInfo = dataIntercept
                };
                // 异常日志里有详细的堆栈信息
                Parallel.For(0, 1, e =>
                {
                    LogLock.OutLogAOP("AOPLogEx", new string[] { apiLogAopExInfo.GetType().ToString(), JsonConvert.SerializeObject(apiLogAopExInfo) });
                });
            }
        }


        public static bool IsAsyncMethod(MethodInfo method)
        {
            return method.ReturnType == typeof(Task) || method.ReturnType.IsGenericType && method.ReturnType.GetGenericTypeDefinition() == typeof(Task<>);
        }
    }


    internal static class InternalAsyncHelper
    {
        public static async Task AwaitTaskWithPostActionAndFinally(Task actualReturnValue, Func<Task> postAction, Action<Exception> finalAction)
        {
            Exception exception = null;

            try
            {
                await actualReturnValue;
                await postAction();
            }
            catch (Exception ex)
            {
                exception = ex;
            }
            finally
            {
                finalAction(exception);
            }
        }

        public static async Task<T> AwaitTaskWithPostActionAndFinallyAndGetResult<T>(Task<T> actualReturnValue, Func<object, Task> postAction,
            Action<Exception> finalAction)
        {
            Exception exception = null;
            try
            {
                var result = await actualReturnValue;
                await postAction(result);
                return result;
            }
            catch (Exception ex)
            {
                exception = ex;
                throw;
            }
            finally
            {
                finalAction(exception);
            }
        }

        public static object CallAwaitTaskWithPostActionAndFinallyAndGetResult(Type taskReturnType, object actualReturnValue,
            Func<object, Task> action, Action<Exception> finalAction)
        {
            return typeof(InternalAsyncHelper)
                .GetMethod(nameof(AwaitTaskWithPostActionAndFinallyAndGetResult), BindingFlags.Public | BindingFlags.Static)
                .MakeGenericMethod(taskReturnType)
                .Invoke(null, new object[] { actualReturnValue, action, finalAction });
        }
    }

    public class AOPLogInfo
    {
        /// <summary>
        /// 请求时间
        /// </summary>
        [Description("请求时间")]
        public string RequestTime { get; set; } = string.Empty;
        /// <summary>
        /// 操作人员
        /// </summary>
        [Description("操作人员")]
        public string OpUserName { get; set; } = string.Empty;
        /// <summary>
        /// 请求方法名
        /// </summary>
        [Description("请求方法名")]
        public string RequestMethodName { get; set; } = string.Empty;
        /// <summary>
        /// 请求参数名
        /// </summary>
        [Description("请求参数名")]
        public string RequestParamsName { get; set; } = string.Empty;
        /// <summary>
        /// 请求参数数据JSON
        /// </summary>
        [Description("请求参数数据JSON")]
        public string RequestParamsData { get; set; } = string.Empty;
        /// <summary>
        /// 请求响应间隔时间
        /// </summary>
        [Description("请求响应间隔时间")]
        public string ResponseIntervalTime { get; set; } = string.Empty;
        /// <summary>
        /// 响应时间
        /// </summary>
        [Description("响应时间")]
        public string ResponseTime { get; set; } = string.Empty;
        /// <summary>
        /// 响应结果
        /// </summary>
        [Description("响应结果")]
        public string ResponseJsonData { get; set; } = string.Empty;
    }

    public class AOPLogExInfo
    {
        public AOPLogInfo ApiLogAopInfo { get; set; }
        /// <summary>
        /// 异常
        /// </summary>
        [Description("异常")]
        public string InnerException { get; set; } = string.Empty;
        /// <summary>
        /// 异常信息
        /// </summary>
        [Description("异常信息")]
        public string ExMessage { get; set; } = string.Empty;
    }
}