using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Serein.Library.Api;
using Serein.Library.Entity;
using Serein.Library.Enums;
using Serein.Library.Ex;
using Serein.NodeFlow.Tool.SereinExpression;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
using static Serein.Library.Utils.ChannelFlowInterrupt;

namespace Serein.NodeFlow.Base
{

    /// <summary>
    /// 节点基类（数据）：条件控件，动作控件，条件区域，动作区域
    /// </summary>
    public abstract partial class NodeModelBase : IDynamicFlowNode
    {


        #region 调试中断

        public Action? CancelInterruptCallback;

        /// <summary>
        /// 中断节点
        /// </summary>
        public void Interrupt()
        {
            this.DebugSetting.InterruptClass = InterruptClass.Branch;
            this.DebugSetting.IsInterrupt = true;
        }

        /// <summary>
        /// 不再中断
        /// </summary>
        public void CancelInterrupt()
        {
            this.DebugSetting.InterruptClass = InterruptClass.None;
            this.DebugSetting.IsInterrupt = false;
            CancelInterruptCallback?.Invoke();
            CancelInterruptCallback = null;
        }
        #endregion

        #region 导出/导入项目文件节点信息

        internal abstract Parameterdata[] GetParameterdatas();
        internal virtual NodeInfo ToInfo()
        {
            // if (MethodDetails == null) return null;

            var trueNodes = SuccessorNodes[ConnectionType.IsSucceed].Select(item => item.Guid); // 真分支
            var falseNodes = SuccessorNodes[ConnectionType.IsFail].Select(item => item.Guid);// 假分支
            var errorNodes = SuccessorNodes[ConnectionType.IsError].Select(item => item.Guid);// 异常分支
            var upstreamNodes = SuccessorNodes[ConnectionType.Upstream].Select(item => item.Guid);// 上游分支

            // 生成参数列表
            Parameterdata[] parameterData = GetParameterdatas();

            return new NodeInfo
            {
                Guid = Guid,
                MethodName = MethodDetails?.MethodName,
                Label = DisplayName ?? "",
                Type = this.GetType().ToString(),
                TrueNodes = trueNodes.ToArray(),
                FalseNodes = falseNodes.ToArray(),
                UpstreamNodes = upstreamNodes.ToArray(),
                ParameterData = parameterData.ToArray(),
                ErrorNodes = errorNodes.ToArray(),

            };
        }

        internal virtual NodeModelBase LoadInfo(NodeInfo nodeInfo)
        {
            var node = this;
            if (node != null)
            {
                node.Guid = nodeInfo.Guid;
                for (int i = 0; i < nodeInfo.ParameterData.Length; i++)
                {
                    Parameterdata? pd = nodeInfo.ParameterData[i];
                    node.MethodDetails.ExplicitDatas[i].IsExplicitData = pd.State;
                    node.MethodDetails.ExplicitDatas[i].DataValue = pd.Value;
                }
            }
            return this;
        }

        #endregion

        #region 节点方法的执行

        /// <summary>
        /// 开始执行
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public async Task StartExecute(IDynamicContext context)
        {
            CancellationTokenSource cts = null;

            try
            {
                cts = context.SereinIoc.Get<CancellationTokenSource>(FlowStarter.FlipFlopCtsName);


                Stack<NodeModelBase> stack = new Stack<NodeModelBase>();
                stack.Push(this);
                while (stack.Count > 0 && !cts.IsCancellationRequested) // 循环中直到栈为空才会退出循环
                {
                    // 从栈中弹出一个节点作为当前节点进行处理
                    var currentNode = stack.Pop();

                    // 设置方法执行的对象
                    if (currentNode.MethodDetails?.ActingInstance == null && currentNode.MethodDetails?.ActingInstanceType is not null)
                    {
                        currentNode.MethodDetails.ActingInstance ??= context.SereinIoc.GetOrRegisterInstantiate(currentNode.MethodDetails.ActingInstanceType);
                    }

                    #region 执行相关
                    // 首先执行上游分支
#if false
                    var upstreamNodes = currentNode.SuccessorNodes[ConnectionType.Upstream];
                    for (int i = upstreamNodes.Count - 1; i >= 0; i--)
                    {
                        if (upstreamNodes[i].DebugSetting.IsEnable) // 排除未启用的上游节点
                        {
                            upstreamNodes[i].PreviousNode = currentNode;
                            await upstreamNodes[i].StartExecute(context); // 执行流程节点的上游分支
                        }
                    } 
#endif

                    currentNode.FlowData =  await currentNode.ExecutingAsync(context); // 流程中正常执行
                    #endregion
                    
                    #region 执行完成
                    if (currentNode.NextOrientation == ConnectionType.None) break; // 不再执行


                    // 选择后继分支
                    var nextNodes = currentNode.SuccessorNodes[currentNode.NextOrientation];

                    // 将下一个节点集合中的所有节点逆序推入栈中
                    for (int i = nextNodes.Count - 1; i >= 0; i--)
                    {
                        // 排除未启用的节点
                        if (nextNodes[i].DebugSetting.IsEnable)
                        {
                            nextNodes[i].PreviousNode = currentNode;
                            stack.Push(nextNodes[i]);
                        }
                    }
                    #endregion
                }
            }
            finally
            {
                cts?.Dispose();
            }
        }

        public static bool TryCreateInterruptTask(IDynamicContext context, NodeModelBase currentNode, out Task<CancelType>? task)
        {
            bool haveTask;
            Console.WriteLine($"[{currentNode.MethodDetails.MethodName}]在当前分支中断");

            if (currentNode.DebugSetting.InterruptClass == InterruptClass.None)
            {
                haveTask = false;
                task = null;
                currentNode.DebugSetting.IsInterrupt = false; // 纠正设置
            }
            else if (currentNode.DebugSetting.InterruptClass == InterruptClass.Branch) // 中断当前分支
            {
                currentNode.DebugSetting.IsInterrupt = true;
                haveTask = true;
                task = context.FlowEnvironment.ChannelFlowInterrupt.CreateChannelWithTimeoutAsync(currentNode.Guid, TimeSpan.FromSeconds(60 * 30)); // 中断30分钟
            }
            else
            {
                haveTask = false;
                task = null;
            }

            return haveTask;
        }

        /// <summary>
        /// 执行节点对应的方法
        /// </summary>
        /// <param name="context">流程上下文</param>
        /// <returns>节点传回数据对象</returns>
        public virtual async Task<object?> ExecutingAsync(IDynamicContext context)
        {
            #region 调试中断
            if (DebugSetting.IsInterrupt && TryCreateInterruptTask(context, this, out Task<CancelType>? task)) // 执行节点前检查中断
            {
                string guid = this.Guid.ToString();
                this.CancelInterruptCallback ??= () => context.FlowEnvironment.ChannelFlowInterrupt.TriggerSignal(guid);
                var cancelType = await task!;
                task?.ToString();
                await Console.Out.WriteLineAsync($"[{this.MethodDetails.MethodName}]中断已{(cancelType == CancelType.Manual ? "手动取消" : "自动取消")}，开始执行后继分支");
            }

            #endregion

            MethodDetails md = MethodDetails;
            var del = md.MethodDelegate.Clone();
            object instance = md.ActingInstance;

            var haveParameter = md.ExplicitDatas.Length > 0;
            var haveResult = md.ReturnType != typeof(void);
            try
            {
                // Action/Func([方法作用的实例],[可能的参数值],[可能的返回值])
                object?[]? parameters = GetParameters(context, md);
                object? result = (haveParameter, haveResult) switch
                {
                    (false, false) => Execution((Action<object>)del, instance), // 调用节点方法，返回null
                    (true, false) => Execution((Action<object, object?[]?>)del, instance, parameters),  // 调用节点方法，返回null
                    (false, true) => Execution((Func<object, object?>)del, instance),  // 调用节点方法，返回方法传回类型
                    (true, true) => Execution((Func<object, object?[]?, object?>)del, instance, parameters), // 调用节点方法，获取入参参数，返回方法忏悔类型
                };

                //object?[]? parameters;
                //object? result = null;
                //if ( haveParameter )
                //{
                //    var data = GetParameters(context, md);
       
                //    if (data[0] is Int32 count && count > 1)
                //    {
                //    }
                //    parameters = [instance, data];
                //}
                //else
                //{
                //    parameters = [instance];
                //}

                //if (haveResult)
                //{
                //    result = del.DynamicInvoke(parameters);
                //}
                //else
                //{
                //    del.DynamicInvoke(parameters);
                //}
                


                NextOrientation = ConnectionType.IsSucceed;
                return result;
            }
            catch (Exception ex)
            {
                NextOrientation = ConnectionType.IsError;
                RuningException = ex;
                return null;
            }
        }

        /// <summary>
        /// 执行等待触发器的方法
        /// </summary>
        /// <param name="context"></param>
        /// <returns>节点传回数据对象</returns>
        /// <exception cref="RuningException"></exception>
        


        #region 节点转换的委托类型
        public static object? Execution(Action<object> del, object instance)
        {
            del?.Invoke(instance);
            return null;
        }
        public static object? Execution(Action<object, object?[]?> del, object instance, object?[]? parameters)
        {
            del?.Invoke(instance, parameters);
            return null;
        }
        public static object? Execution(Func<object, object?> del, object instance)
        {
            return del?.Invoke(instance);
        }
        public static object? Execution(Func<object, object?[]?, object?> del, object instance, object?[]? parameters)
        {
            return del?.Invoke(instance, parameters);
        }
        #endregion


        /// <summary>
        /// 获取对应的参数数组
        /// </summary>
        public object?[]? GetParameters(IDynamicContext context, MethodDetails md)
        {
            // 用正确的大小初始化参数数组
            if (md.ExplicitDatas.Length == 0)
            {
                return null;// md.ActingInstance
            }

            object?[]? parameters = new object[md.ExplicitDatas.Length];
            var flowData = PreviousNode?.FlowData; // 当前传递的数据
            var previousDataType = flowData?.GetType();

            for (int i = 0; i < parameters.Length; i++)
            {

                object? inputParameter; // 存放解析的临时参数
                var ed = md.ExplicitDatas[i]; // 方法入参描述


                if (ed.IsExplicitData)
                {

                    if (ed.DataValue.StartsWith("@get", StringComparison.OrdinalIgnoreCase))
                    {
                        // 执行表达式从上一节点获取对象
                        inputParameter = SerinExpressionEvaluator.Evaluate(ed.DataValue, flowData, out _);
                    }
                    else
                    {
                        // 使用输入的固定值
                        inputParameter = ed.DataValue;
                    }
                }
                else
                {
                    inputParameter = flowData;   // 使用上一节点的对象
                }

                try
                {
                    parameters[i] = ed.DataType switch
                    {
                        //Type t when t == previousDataType => inputParameter, // 上下文
                        Type t when t == typeof(IDynamicContext) => context, // 上下文
                        Type t when t == typeof(MethodDetails) => md, // 节点方法描述
                        Type t when t == typeof(NodeModelBase) => this, // 节点实体类
                        Type t when t == typeof(Guid) => new Guid(inputParameter?.ToString()),
                        Type t when t == typeof(DateTime) => DateTime.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(string) => inputParameter?.ToString(),
                        Type t when t == typeof(char) => char.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(bool) => inputParameter is null ? false : bool.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(float) => inputParameter is null ? 0F : float.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(decimal) => inputParameter is null ? 0 : decimal.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(double) => inputParameter is null ? 0 : double.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(sbyte) => inputParameter is null ? 0 : sbyte.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(byte) => inputParameter is null ? 0 : byte.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(short) => inputParameter is null ? 0 : short.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(ushort) => inputParameter is null ? 0U : ushort.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(int) => inputParameter is null ? 0 : int.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(uint) => inputParameter is null ? 0U : uint.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(long) => inputParameter is null ? 0L : long.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(ulong) => inputParameter is null ? 0UL : ulong.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(nint) => inputParameter is null ? 0 : nint.Parse(inputParameter?.ToString()),
                        Type t when t == typeof(nuint) => inputParameter is null ? 0 : nuint.Parse(inputParameter?.ToString()),



                        Type t when t.IsEnum => Enum.Parse(ed.DataType, ed.DataValue),// 需要枚举
                        Type t when t.IsArray => (inputParameter as Array)?.Cast<object>().ToList(),
                        Type t when t.IsGenericType && t.GetGenericTypeDefinition() == typeof(List<>) => inputParameter,
                        Type t when Nullable.GetUnderlyingType(t) != null => inputParameter == null ? null : Convert.ChangeType(inputParameter, Nullable.GetUnderlyingType(t)),
                        _ => inputParameter,
                    };
                }
                catch (Exception ex) // 节点参数类型转换异常
                {
                    parameters[i] = null;
                    Console.WriteLine(ex);
                }
            }
            return parameters;
        }

        #endregion

    }
}