using Serein.Library.Api;
using Serein.Library.Attributes;
using Serein.Library.Core.NodeFlow;
using System.Collections.Concurrent;
using System.Reflection;

namespace Serein.NodeFlow.Tool;


public static class DelegateCache
{
    /// <summary>
    /// 委托缓存全局字典
    /// </summary>
    public static ConcurrentDictionary<string, Delegate> GlobalDicDelegates { get; } = new ConcurrentDictionary<string, Delegate>();
}

public static class DelegateGenerator
{
    // 缓存的实例对象（键：类型名称）
    public static ConcurrentDictionary<string, object> DynamicInstanceToType { get; } = new ConcurrentDictionary<string, object>();
    // 缓存的实例对象 （键：生成的方法名称）
    // public static ConcurrentDictionary<string, object> DynamicInstance { get; } = new ConcurrentDictionary<string, object>();

    /// <summary>
    /// 生成方法信息
    /// </summary>
    /// <param name="serviceContainer"></param>
    /// <param name="type"></param>
    /// <returns></returns>
    public static ConcurrentDictionary<string, MethodDetails> GenerateMethodDetails(ISereinIoc serviceContainer, Type type, bool isNetFramework)
    {
        var methodDetailsDictionary = new ConcurrentDictionary<string, MethodDetails>();
        var assemblyName = type.Assembly.GetName().Name;
        var methods = GetMethodsToProcess(type, isNetFramework);

        foreach (var method in methods)
        {

            var methodDetails = CreateMethodDetails(serviceContainer, type, method, assemblyName, isNetFramework);

            methodDetailsDictionary.TryAdd(methodDetails.MethodName, methodDetails);
        }

        return methodDetailsDictionary;
    }

    /// <summary>
    /// 获取处理方法
    /// </summary>
    private static IEnumerable<MethodInfo> GetMethodsToProcess(Type type, bool isNetFramework)
    {
        if (isNetFramework)
        {

            return type.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
                       .Where(m => m.GetCustomAttribute<NodeActionAttribute>()?.Scan == true);
        }
        else
        {

            return type.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
                       .Where(m => m.GetCustomAttribute<NodeActionAttribute>()?.Scan == true);
        }
    }
    /// <summary>
    /// 创建方法信息
    /// </summary>
    /// <returns></returns>
    private static MethodDetails CreateMethodDetails(ISereinIoc serviceContainer, Type type, MethodInfo method, string assemblyName, bool isNetFramework)
    {
        
            var methodName = method.Name;
            var attribute = method.GetCustomAttribute<NodeActionAttribute>();
            var explicitDataOfParameters = GetExplicitDataOfParameters(method.GetParameters());
            // 生成委托
            var methodDelegate = GenerateMethodDelegate(type,   // 方法所在的对象类型
                                                        method, // 方法信息
                                                        method.GetParameters(),// 方法参数
                                                        method.ReturnType);// 返回值


            var dllTypeName = $"{assemblyName}.{type.Name}";
            serviceContainer.Register(type);
            object instance = serviceContainer.GetOrCreateServiceInstance(type);
            var dllTypeMethodName = $"{assemblyName}.{type.Name}.{method.Name}";

            return new MethodDetails
            {
                ActingInstanceType = type,
                ActingInstance = instance,
                MethodName = dllTypeMethodName,
                MethodDelegate = methodDelegate,
                MethodDynamicType = attribute.MethodDynamicType,
                MethodLockName = attribute.LockName,
                MethodTips = attribute.MethodTips,
                ExplicitDatas = explicitDataOfParameters,
                ReturnType = method.ReturnType,
            };
        
    }

    private static ExplicitData[] GetExplicitDataOfParameters(ParameterInfo[] parameters)
    {

        return parameters.Select((it, index) =>
        {
            //Console.WriteLine($"{it.Name}-{it.HasDefaultValue}-{it.DefaultValue}");
            string explicitTypeName = GetExplicitTypeName(it.ParameterType);
            var items = GetExplicitItems(it.ParameterType, explicitTypeName);
            if ("Bool".Equals(explicitTypeName)) explicitTypeName = "Select"; // 布尔值 转为 可选类型



            return new ExplicitData
            {
                IsExplicitData = it.HasDefaultValue,
                Index = index,
                ExplicitType = it.ParameterType,
                ExplicitTypeName = explicitTypeName,
                DataType = it.ParameterType,
                ParameterName = it.Name,
                DataValue = it.HasDefaultValue ? it.DefaultValue.ToString() : "",
                Items = items.ToArray(),
            };



        }).ToArray();
    }

    private static string GetExplicitTypeName(Type type)
    {
        return type switch
        {
            Type t when t.IsEnum => "Select",
            Type t when t == typeof(bool) => "Bool",
            Type t when t == typeof(string) => "Value",
            Type t when t == typeof(int) => "Value",
            Type t when t == typeof(double) => "Value",
            _ => "Value"
        };
    }

    private static IEnumerable<string> GetExplicitItems(Type type, string explicitTypeName)
    {
        return explicitTypeName switch
        {
            "Select" => Enum.GetNames(type),
            "Bool" => ["True", "False"],
            _ => []
        };

    }

    private static Delegate GenerateMethodDelegate(Type type, MethodInfo methodInfo, ParameterInfo[] parameters, Type returnType)
    {
        var parameterTypes = parameters.Select(p => p.ParameterType).ToArray();
        var parameterCount = parameters.Length;

        if (returnType == typeof(void))
        {
            if (parameterCount == 0)
            {
                // 无返回值，无参数
                return ExpressionHelper.MethodCaller(type, methodInfo);
            }
            else
            {
                // 无返回值，有参数
                return ExpressionHelper.MethodCaller(type, methodInfo, parameterTypes);
            }
        }
        // else if (returnType == typeof(Task<FlipflopContext)) // 触发器
        else if (FlipflopFunc.IsTaskOfFlipflop(returnType)) // 触发器
        {
            if (parameterCount == 0)
            {
                // 有返回值，无参数
                return ExpressionHelper.MethodCallerAsync(type, methodInfo);
            }
            else
            {
                // 有返回值，有参数
                return ExpressionHelper.MethodCallerAsync(type, methodInfo, parameterTypes);
            }
        }
        else
        {
            if (parameterCount == 0)
            {
                // 有返回值，无参数
                return ExpressionHelper.MethodCallerHaveResult(type, methodInfo);
            }
            else
            {
                // 有返回值，有参数
                return ExpressionHelper.MethodCallerHaveResult(type, methodInfo, parameterTypes);
            }
        }
    }

}