using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Text;
using System.Threading;
using System.Xml;

namespace Convention
{
    public static class PlatformIndicator
    {
#if DEBUG
        public static bool IsRelease => false;
#else
        public static bool IsRelease => true;
#endif
        public static bool IsPlatformWindows => RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
        public static bool IsPlatformLinux => RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
        public static bool IsPlatformOsx => RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
        public static bool IsPlatformX64 => System.Environment.Is64BitOperatingSystem;

        static PlatformIndicator()
        {
            MainThreadID = Thread.CurrentThread.ManagedThreadId;
        }

        public static int MainThreadID { get; private set; }
        public static bool CurrentThreadIsMainThread()
        {
            return MainThreadID == Thread.CurrentThread.ManagedThreadId;
        }

        public static string CompanyName = "DefaultCompany";

        public static string ProductName = "DefaultProject";

        public static string ApplicationPath => Environment.ProcessPath;

        public static string StreamingAssetsPath => Path.Combine(ApplicationPath, "StreamingAssets/");

        public static string PersistentDataPath
        {
            get
            {
                if (IsPlatformWindows)
                    return Environment.ExpandEnvironmentVariables($@"%userprofile%\AppData\LocalLow\{CompanyName}\{ProductName}\");
                else if (IsPlatformLinux)
                    return Environment.ExpandEnvironmentVariables(@"$HOME/.config/");
                return "";
            }
        }

        public static string DataPath => "Assets/";
    }

    public static partial class Utility
    {
        //[MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static string ConvertString(object obj)
        {
            return Convert.ToString(obj);
        }
        public static T ConvertValue<T>(string str)
        {
            Type type = typeof(T);
            var parse_method = type.GetMethod("Parse", BindingFlags.Static | BindingFlags.Public, null, new Type[] { typeof(string) }, null);
            if (parse_method != null &&
                (parse_method.ReturnType.IsSubclassOf(type) || parse_method.ReturnType == type) &&
                parse_method.GetParameters().Length == 1 &&
                parse_method.GetParameters()[0].ParameterType == typeof(string))
            {
                return (T)parse_method.Invoke(null, new object[] { str });
            }

            throw new InvalidCastException($"\"{str}\" is cannt convert to type<{type}>");
        }


        /// <summary>
        /// 序列化
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static byte[] Serialize<T>(T obj)
        {
            ArgumentNullException.ThrowIfNull(obj);

            using var memoryStream = new MemoryStream();
            DataContractSerializer ser = new DataContractSerializer(typeof(T));
            ser.WriteObject(memoryStream, obj);
            var data = memoryStream.ToArray();
            return data;
        }

        /// <summary>
        /// 反序列化
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="data"></param>
        /// <returns></returns>
        public static T Deserialize<T>(byte[] data)
        {
            ArgumentNullException.ThrowIfNull(data);

            using var memoryStream = new MemoryStream(data);
            XmlDictionaryReader reader = XmlDictionaryReader.CreateTextReader(memoryStream, new XmlDictionaryReaderQuotas());
            DataContractSerializer ser = new DataContractSerializer(typeof(T));
            var result = (T)ser.ReadObject(reader, true);
            return result;
        }

        public static object SeekValue(object obj, string name, BindingFlags flags, out bool isSucceed)
        {
            Type type = obj.GetType();
            var field = type.GetField(name, flags);
            isSucceed = true;
            if (field != null)
            {
                return field.GetValue(obj);
            }
            var property = type.GetProperty(name, flags);
            if (property != null)
            {
                return property.GetValue(obj);
            }
            isSucceed = false;
            return null;
        }
        public static object SeekValue(object obj, string name, BindingFlags flags)
        {
            Type type = obj.GetType();
            var field = type.GetField(name, flags);
            if (field != null)
            {
                return field.GetValue(obj);
            }
            var property = type.GetProperty(name, flags);
            if (property != null)
            {
                return property.GetValue(obj);
            }
            return null;
        }
        public static object SeekValue(object obj, string name, Type valueType, BindingFlags flags, out bool isSucceed)
        {
            Type type = obj.GetType();
            var field = type.GetField(name, flags);
            isSucceed = true;
            if (field != null && field.FieldType == valueType)
            {
                return field.GetValue(obj);
            }
            var property = type.GetProperty(name, flags);
            if (property != null && property.PropertyType == valueType)
            {
                return property.GetValue(obj);
            }
            isSucceed = false;
            return null;
        }
        public static object SeekValue(object obj, string name, Type valueType, BindingFlags flags)
        {
            Type type = obj.GetType();
            var field = type.GetField(name, flags);
            if (field != null && field.FieldType == valueType)
            {
                return field.GetValue(obj);
            }
            var property = type.GetProperty(name, flags);
            if (property != null && property.PropertyType == valueType)
            {
                return property.GetValue(obj);
            }
            return null;
        }
        public static bool PushValue(object obj, object value, string name, BindingFlags flags)
        {
            Type type = obj.GetType();
            var field = type.GetField(name, flags);
            if (field != null)
            {
                field.SetValue(obj, value);
                return true;
            }
            var property = type.GetProperty(name, flags);
            if (property != null)
            {
                property.SetValue(obj, value);
                return true;
            }
            return false;
        }

        public static List<Type> SeekType(Predicate<Type> pr, IEnumerable<Assembly> assemblys = null, int findCount = -1)
        {
            List<Type> types = new List<Type>();
            if (assemblys == null)
                assemblys = AppDomain.CurrentDomain.GetAssemblies();
            foreach (var assembly in assemblys)
            {
                foreach (var type in assembly.GetTypes())
                {
                    if (pr(type))
                        types.Add(type);
                    if (types.Count == findCount)
                        return types;
                }
            }
            return types;
        }

        public static List<MemberInfo> GetMemberInfos(Type type, IEnumerable<Type> cutOffType = null, bool isGetNotPublic = false, bool isGetStatic = false)
        {
            Type current = type;
            BindingFlags flags = BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly;
            List<MemberInfo> result = new();
            if (isGetNotPublic)
                flags |= BindingFlags.NonPublic;
            if (isGetStatic)
                flags |= BindingFlags.Static;
            while ((cutOffType != null && !cutOffType.Contains(current)) && current != null)
            {
                result.AddRange(current.GetFields(flags));
                result.AddRange(current.GetProperties(flags));
                result.AddRange(current.GetMethods(flags));
                current = current.BaseType;
            }
            return result;
        }

        public static bool IsNumber([In] object data)
        {
            if (data == null) return false;
            var type = data.GetType();
            return IsNumber(type);
        }
        public static bool IsString([In] object data)
        {
            if (data == null) return false;
            var type = data.GetType();
            return IsString(type);
        }
        public static bool IsBinary([In] object data)
        {
            if (data == null) return false;
            var type = data.GetType();
            return IsBinary(type);
        }
        public static bool IsArray([In] object data)
        {
            if (data == null) return false;
            var type = data.GetType();
            return IsArray(type);
        }
        public static bool IsBool([In] object data)
        {
            if (data == null) return false;
            return IsBool(data.GetType());
        }

        public static bool IsNumber([In] Type type)
        {
            return
                type == typeof(double) ||
                type == typeof(float) ||
                type == typeof(int) ||
                type == typeof(long) ||
                type == typeof(sbyte) ||
                type == typeof(short) ||
                type == typeof(ushort) ||
                type == typeof(uint) ||
                type == typeof(ulong) ||
                type == typeof(char);
        }
        public static bool IsString([In] Type type)
        {
            return type == typeof(string) || type == typeof(char[]);
        }
        public static bool IsBinary([In] Type type)
        {
            return
                type == typeof(byte) ||
                type == typeof(sbyte) ||
                type == typeof(byte[]) ||
                type == typeof(sbyte[]);
        }
        public static bool IsArray([In] Type type)
        {
            return type.IsArray;
        }
        public static bool IsBool([In] Type type)
        {
            return type == typeof(bool);
        }
        public static bool IsEnum([In] Type type)
        {
            return type.IsEnum;
        }

        public static bool HasCustomAttribute(MemberInfo member, IEnumerable<Type> attrs)
        {
            foreach (var attr in attrs)
            {
                if (member.GetCustomAttribute(attr, true) != null)
                    return true;
            }
            return false;
        }
        public static Type GetMemberValueType(MemberInfo member)
        {
            if (member is FieldInfo field)
            {
                return field.FieldType;
            }
            else if (member is PropertyInfo property)
            {
                return property.PropertyType;
            }
            return null;
        }
        public static bool GetMemberValueType(MemberInfo member, out Type type)
        {
            if (member is FieldInfo field)
            {
                type = field.FieldType;
                return true;
            }
            else if (member is PropertyInfo property)
            {
                type = property.PropertyType;
                return true;
            }
            type = null;
            return false;
        }
        public static void PushValue(object target, object value, MemberInfo info)
        {
            if (info is FieldInfo field)
            {
                if (value.GetType().IsSubclassOf(field.FieldType))
                    field.SetValue(target, value);
                else
                {
                    field.SetValue(target, field.FieldType.GetMethod(nameof(float.Parse)).Invoke(target, new object[] { value }));
                }
            }
            else if (info is PropertyInfo property)
            {
                property.SetValue(target, value);
            }
            else
            {
                throw new InvalidOperationException("info is unsupport");
            }
        }
        public static object SeekValue(object target, MemberInfo info)
        {
            if (info is FieldInfo field)
            {
                return field.GetValue(target);
            }
            else if (info is PropertyInfo property)
            {
                return property.GetValue(target);
            }
            else
            {
                throw new InvalidOperationException("info is unsupport");
            }
        }
        public static bool TrySeekValue(object target, MemberInfo info, out object value)
        {
            if (info is FieldInfo field)
            {
                value = field.GetValue(target);
                return true;
            }
            else if (info is PropertyInfo property)
            {
                value = property.GetValue(target);
                return true;
            }
            value = null;
            return false;
        }

        public static List<MemberInfo> SeekMemberInfo(object target, IEnumerable<Type> attrs, IEnumerable<Type> types, Type untilBase = null)
        {
            Type _CurType = target.GetType();
            List<MemberInfo> result = new();
            result.AddRange(_CurType.GetMembers(BindingFlags.Public | BindingFlags.Instance));
            while (_CurType != null && _CurType != typeof(object) && _CurType != untilBase)
            {
                result.AddRange(
                    from info in _CurType.GetMembers(BindingFlags.NonPublic | BindingFlags.Instance)
                    where attrs == null || HasCustomAttribute(info, attrs)
                    where types == null || (GetMemberValueType(info, out var type) && types.Contains(type))
                    select info
                    );
                _CurType = _CurType.BaseType;
            }
            return result;
        }
        public static List<MemberInfo> SeekMemberInfo(object target, IEnumerable<string> names, BindingFlags flags = BindingFlags.Default)
        {
            Type _CurType = target.GetType();
            List<MemberInfo> result = _CurType.GetMembers(flags).ToList();
            HashSet<string> nameSet = names.ToHashSet();
            result.RemoveAll(x => nameSet.Contains(x.Name) == false);
            return result;
        }
        public static object InvokeMember(MemberInfo member, object target, params object[] parameters)
        {
            if (member is MethodInfo method)
            {
                return method.Invoke(target, parameters);
            }
            return null;
        }
        public static bool TryInvokeMember(MemberInfo member, object target, out object returnValue, params object[] parameters)
        {
            returnValue = null;
            if (member is MethodInfo method)
            {
                returnValue = method.Invoke(target, parameters);
                return true;
            }
            else return false;
        }

        public static T Shared<T>(T target, out T value)
        {
            value = target;
            return value;
        }


        public static string NowFormat(string format = "yyyy-MM-dd_HH-mm-ss")
        {
            return DateTime.Now.ToString(format);
        }

        public class EnumerableClass : IEnumerable
        {
            private readonly IEnumerator ir;

            public EnumerableClass(IEnumerator ir)
            {
                this.ir = ir;
            }

            public IEnumerator GetEnumerator()
            {
                return ir;
            }
        }

        public static IEnumerable AsEnumerable(this IEnumerator ir)
        {
            return new EnumerableClass(ir);
        }

        /// <summary>
        /// Marshal 相关的实用函数。
        /// </summary>
        public static class Marshal
        {

            [Serializable]
            public class MarshalException : Exception
            {
                public MarshalException() { }
                public MarshalException(string message) : base(message) { }
                public MarshalException(string message, Exception inner) : base(message, inner) { }
            }

            private const int BlockSize = 1024 * 4;
            private static IntPtr s_CachedHGlobalPtr = IntPtr.Zero;
            private static int s_CachedHGlobalSize = 0;

            /// <summary>
            /// 获取缓存的从进程的非托管内存中分配的内存的大小。
            /// </summary>
            public static int CachedHGlobalSize
            {
                get
                {
                    return s_CachedHGlobalSize;
                }
            }

            /// <summary>
            /// 确保从进程的非托管内存中分配足够大小的内存并缓存。
            /// </summary>
            /// <param name="ensureSize">要确保从进程的非托管内存中分配内存的大小。</param>
            public static void EnsureCachedHGlobalSize(int ensureSize)
            {
                if (ensureSize < 0)
                {
                    throw new MarshalException("Ensure size is invalid.");
                }

                if (s_CachedHGlobalPtr == IntPtr.Zero || s_CachedHGlobalSize < ensureSize)
                {
                    FreeCachedHGlobal();
                    int size = (ensureSize - 1 + BlockSize) / BlockSize * BlockSize;
                    s_CachedHGlobalPtr = System.Runtime.InteropServices.Marshal.AllocHGlobal(size);
                    s_CachedHGlobalSize = size;
                }
            }

            /// <summary>
            /// 释放缓存的从进程的非托管内存中分配的内存。
            /// </summary>
            public static void FreeCachedHGlobal()
            {
                if (s_CachedHGlobalPtr != IntPtr.Zero)
                {
                    System.Runtime.InteropServices.Marshal.FreeHGlobal(s_CachedHGlobalPtr);
                    s_CachedHGlobalPtr = IntPtr.Zero;
                    s_CachedHGlobalSize = 0;
                }
            }

            /// <summary>
            /// 将数据从对象转换为二进制流。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structure">要转换的对象。</param>
            /// <returns>存储转换结果的二进制流。</returns>
            public static byte[] StructureToBytes<T>(T structure)
            {
                return StructureToBytes(structure, System.Runtime.InteropServices.Marshal.SizeOf(typeof(T)));
            }

            /// <summary>
            /// 将数据从对象转换为二进制流。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structure">要转换的对象。</param>
            /// <param name="structureSize">要转换的对象的大小。</param>
            /// <returns>存储转换结果的二进制流。</returns>
            internal static byte[] StructureToBytes<T>(T structure, int structureSize)
            {
                if (structureSize < 0)
                {
                    throw new MarshalException("Structure size is invalid.");
                }

                EnsureCachedHGlobalSize(structureSize);
                System.Runtime.InteropServices.Marshal.StructureToPtr(structure, s_CachedHGlobalPtr, true);
                byte[] result = new byte[structureSize];
                System.Runtime.InteropServices.Marshal.Copy(s_CachedHGlobalPtr, result, 0, structureSize);
                return result;
            }

            /// <summary>
            /// 将数据从对象转换为二进制流。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structure">要转换的对象。</param>
            /// <param name="result">存储转换结果的二进制流。</param>
            public static void StructureToBytes<T>(T structure, byte[] result)
            {
                StructureToBytes(structure, System.Runtime.InteropServices.Marshal.SizeOf(typeof(T)), result, 0);
            }

            /// <summary>
            /// 将数据从对象转换为二进制流。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structure">要转换的对象。</param>
            /// <param name="structureSize">要转换的对象的大小。</param>
            /// <param name="result">存储转换结果的二进制流。</param>
            internal static void StructureToBytes<T>(T structure, int structureSize, byte[] result)
            {
                StructureToBytes(structure, structureSize, result, 0);
            }

            /// <summary>
            /// 将数据从对象转换为二进制流。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structure">要转换的对象。</param>
            /// <param name="result">存储转换结果的二进制流。</param>
            /// <param name="startIndex">写入存储转换结果的二进制流的起始位置。</param>
            public static void StructureToBytes<T>(T structure, byte[] result, int startIndex)
            {
                StructureToBytes(structure, System.Runtime.InteropServices.Marshal.SizeOf(typeof(T)), result, startIndex);
            }

            /// <summary>
            /// 将数据从对象转换为二进制流。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structure">要转换的对象。</param>
            /// <param name="structureSize">要转换的对象的大小。</param>
            /// <param name="result">存储转换结果的二进制流。</param>
            /// <param name="startIndex">写入存储转换结果的二进制流的起始位置。</param>
            internal static void StructureToBytes<T>(T structure, int structureSize, byte[] result, int startIndex)
            {
                if (structureSize < 0)
                {
                    throw new MarshalException("Structure size is invalid.");
                }

                if (result == null)
                {
                    throw new MarshalException("Result is invalid.");
                }

                if (startIndex < 0)
                {
                    throw new MarshalException("Start index is invalid.");
                }

                if (startIndex + structureSize > result.Length)
                {
                    throw new MarshalException("Result length is not enough.");
                }

                EnsureCachedHGlobalSize(structureSize);
                System.Runtime.InteropServices.Marshal.StructureToPtr(structure, s_CachedHGlobalPtr, true);
                System.Runtime.InteropServices.Marshal.Copy(s_CachedHGlobalPtr, result, startIndex, structureSize);
            }

            /// <summary>
            /// 将数据从二进制流转换为对象。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="buffer">要转换的二进制流。</param>
            /// <returns>存储转换结果的对象。</returns>
            public static T BytesToStructure<T>(byte[] buffer)
            {
                return BytesToStructure<T>(System.Runtime.InteropServices.Marshal.SizeOf(typeof(T)), buffer, 0);
            }

            /// <summary>
            /// 将数据从二进制流转换为对象。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="buffer">要转换的二进制流。</param>
            /// <param name="startIndex">读取要转换的二进制流的起始位置。</param>
            /// <returns>存储转换结果的对象。</returns>
            public static T BytesToStructure<T>(byte[] buffer, int startIndex)
            {
                return BytesToStructure<T>(System.Runtime.InteropServices.Marshal.SizeOf(typeof(T)), buffer, startIndex);
            }

            /// <summary>
            /// 将数据从二进制流转换为对象。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structureSize">要转换的对象的大小。</param>
            /// <param name="buffer">要转换的二进制流。</param>
            /// <returns>存储转换结果的对象。</returns>
            internal static T BytesToStructure<T>(int structureSize, byte[] buffer)
            {
                return BytesToStructure<T>(structureSize, buffer, 0);
            }

            /// <summary>
            /// 将数据从二进制流转换为对象。
            /// </summary>
            /// <typeparam name="T">要转换的对象的类型。</typeparam>
            /// <param name="structureSize">要转换的对象的大小。</param>
            /// <param name="buffer">要转换的二进制流。</param>
            /// <param name="startIndex">读取要转换的二进制流的起始位置。</param>
            /// <returns>存储转换结果的对象。</returns>
            internal static T BytesToStructure<T>(int structureSize, byte[] buffer, int startIndex)
            {
                if (structureSize < 0)
                {
                    throw new MarshalException("Structure size is invalid.");
                }

                if (buffer == null)
                {
                    throw new MarshalException("Buffer is invalid.");
                }

                if (startIndex < 0)
                {
                    throw new MarshalException("Start index is invalid.");
                }

                if (startIndex + structureSize > buffer.Length)
                {
                    throw new MarshalException("Buffer length is not enough.");
                }

                EnsureCachedHGlobalSize(structureSize);
                System.Runtime.InteropServices.Marshal.Copy(buffer, startIndex, s_CachedHGlobalPtr, structureSize);
                return (T)System.Runtime.InteropServices.Marshal.PtrToStructure(s_CachedHGlobalPtr, typeof(T));
            }
        }

        /// <summary>
        /// 获取类型的友好显示名称，支持泛型、数组等复杂类型
        /// </summary>
        public static string GetFriendlyName(this Type type)
        {
            if (type == null) return null;

            // 处理泛型类型
            if (type.IsGenericType)
            {
                // 特殊处理可空类型（Nullable<T>）
                if (type.IsNullable())
                {
                    return $"{GetFriendlyName(type.GetGenericArguments()[0])}?";
                }

                var sb = new StringBuilder();
                // 获取类型基础名称（移除 `1, `2 等后缀）
                string baseName = type.Name.Contains('`') ? type.Name[..type.Name.IndexOf('`')] : type.Name;
                sb.Append(baseName);
                sb.Append('<');

                // 递归处理泛型参数
                Type[] args = type.GetGenericArguments();
                for (int i = 0; i < args.Length; i++)
                {
                    if (i > 0) sb.Append(", ");
                    sb.Append(GetFriendlyName(args[i]));
                }

                sb.Append('>');
                return sb.ToString();
            }

            // 处理数组类型
            if (type.IsArray)
            {
                string elementName = GetFriendlyName(type.GetElementType());
                int rank = type.GetArrayRank();
                return rank == 1 ? $"{elementName}[]" : $"{elementName}[{new string(',', rank - 1)}]";
            }

            // 处理指针类型
            if (type.IsPointer)
            {
                return $"{GetFriendlyName(type.GetElementType())}*";
            }

            // 处理引用类型（ref/out 参数）
            if (type.IsByRef)
            {
                return $"{GetFriendlyName(type.GetElementType())}&";
            }

            // 普通类型直接返回名称
            return type.Name;
        }

        /// <summary>
        /// 判断是否为可空类型
        /// </summary>
        public static bool IsNullable(this Type type)
        {
            return type.IsGenericType &&
                   type.GetGenericTypeDefinition() == typeof(Nullable<>);
        }
    }
}

namespace Convention
{
    public static partial class Utility
    {
        /// <summary>
        /// 生成期望类型的栈实例
        /// </summary>
        /// <param name="type">期望类型</param>
        /// <returns></returns>
        public static object CreateStack([In] Type type)
        {
            var stackType = typeof(Stack<>).MakeGenericType(type);
            var stackInstance = Activator.CreateInstance(stackType);
            return stackInstance;
        }

        /// <summary>
        /// 生成期望类型的队列实例
        /// </summary>
        /// <param name="type">期望类型</param>
        /// <returns></returns>
        public static object CreateQueue([In] Type type)
        {
            var queueType = typeof(Queue<>).MakeGenericType(type);
            var queueInstance = Activator.CreateInstance(queueType);
            return queueInstance;
        }

        /// <summary>
        /// 生成期望类型的列表实例
        /// </summary>
        /// <param name="type">期望类型</param>
        /// <returns></returns>
        public static object CreateList([In] Type type)
        {
            var listType = typeof(List<>).MakeGenericType(type);
            var listInstance = Activator.CreateInstance(listType);
            return listInstance;
        }

        /// <summary>
        /// 生成期望键值对类型的字典实例
        /// </summary>
        /// <param name="keyType">期望键类型</param>
        /// <param name="valueType">期望值类型</param>
        /// <returns></returns>
        public static object CreateDictionary([In] Type keyType, [In] Type valueType)
        {
            var dictType = typeof(Dictionary<,>).MakeGenericType(keyType, valueType);
            var dictInstance = Activator.CreateInstance(dictType);
            return dictInstance;
        }
    }
}