using System;
using System.IO;
using System.Reflection;
using System.Text;

namespace StructToClass
{
    class Program
    {
        private static string[] forVals = {"i", "j", "k", "m", "n", "x", "y", "z"};

        private static string fileName = "../../../u2china_svr_proj/BattleServer/Src/ProtoHelper.cs";

        private static FileStream fileStream = null;

        public enum ConvertMode
        {
            ClassToStruct = 1,
            StructToClass = 2,
        }

        private static void Write(string filename, string content)
        {
            fileStream.Write(ASCIIEncoding.Default.GetBytes(content));
            //File.AppendAllText(filename, content);
        }

        private static void WriteLine(string filename, string content)
        {
            content += "\n";
            fileStream.Write(ASCIIEncoding.Default.GetBytes(content));
            //File.AppendAllText(filename, content);
            //File.AppendAllText(filename, "\n");
        }

        private static void WriteIndent(int indentNum)
        {
            string str = null;
            for (int i = 0; i < indentNum; i++)
            {
                str += "\t";
            }

            Write(fileName, str);
        }

        private static void WriteFileHead()
        {
            string str = @"// GENERATE BY TOOLS, DO NOT EDIT!
namespace Battle
{
    public static class ProtoHelper
    {";
            WriteLine(fileName, str);
        }

        private static void WriteFileTail()
        {
            WriteLine(fileName, "\t}");
            WriteLine(fileName, "}");
        }

        private static void WriteFuncHead(Type clsType, ConvertMode mode)
        {
            if (mode == ConvertMode.ClassToStruct)
            {
                string str = $"\t\tpublic static void {clsType.Name}ToStruct(ProtoCSClass.{clsType.Name} cls, ref ProtoCSStruct.{clsType.Name} st)";
                WriteLine(fileName, str);
                WriteLine(fileName, "\t\t{");
            }
            else
            {
                string str = $"\t\tpublic static ProtoCSClass.{clsType.Name} {clsType.Name}ToClass(ref ProtoCSStruct.{clsType.Name} st)";
                WriteLine(fileName, str);
                WriteLine(fileName, "\t\t{");
                str = $"\t\t\tvar cls = new ProtoCSClass.{clsType.Name}();";
                WriteLine(fileName, str);
            }
        }

        private static void WriteFuncTail(ConvertMode mode)
        {
            if (mode == ConvertMode.StructToClass)
            {
                WriteLine(fileName, "\t\t\treturn cls;");
            }
            
            WriteLine(fileName, "\t\t}");
        }

        public static void StructToClass(Type clsType, string prefix, int indentNum, int forIdx, ConvertMode convMode)
        {
            string src, dst, ns;

            if (convMode == ConvertMode.ClassToStruct)
            {
                src = "cls";
                dst = "st";
                ns = "ProtoCSStruct";
            }
            else
            {
                src = "st";
                dst = "cls";
                ns = "ProtoCSClass";
            }

            string newPrefix;
            var allFiled = clsType.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
            foreach (FieldInfo field in allFiled)
            {
                string line;
                var fieldType = field.FieldType;

                if (fieldType.IsEnum)
                {
                    WriteIndent(indentNum);

                    if (prefix != null)
                    {
                        line = $"{dst}.{prefix}.{field.Name} = ({ns}.{fieldType.Name}){src}.{prefix}.{field.Name};";
                    }
                    else
                    {
                        line = $"{dst}.{field.Name} = ({ns}.{fieldType.Name}){src}.{field.Name};";
                    }

                    WriteLine(fileName, line);
                }
                else if (fieldType.IsPrimitive)
                {
                    WriteIndent(indentNum);

                    if (prefix != null)
                    {
                        line = $"{dst}.{prefix}.{field.Name} = {src}.{prefix}.{field.Name};";
                    }
                    else
                    {
                        line = $"{dst}.{field.Name} = {src}.{field.Name};";
                    }

                    WriteLine(fileName, line);
                }
                else if (fieldType == typeof(string))
                {
                    WriteIndent(indentNum);

                    if (convMode == ConvertMode.ClassToStruct)
                    {
                        if (prefix != null)
                        {
                            line = $"{dst}.{prefix}.{field.Name}.SetString({src}.{prefix}.{field.Name});";
                        }
                        else
                        {
                            line = $"{dst}.{prefix}.SetString({src}.{prefix});";
                        }
                    }
                    else
                    {
                        if (prefix != null)
                        {
                            line = $"{dst}.{prefix}.{field.Name} = {src}.{prefix}.{field.Name}.GetString();";
                        }
                        else
                        {
                            line = $"{dst}.{prefix} = {src}.{prefix}.GetString();";
                        }
                    }

                    WriteLine(fileName, line);
                }
                else if (fieldType.IsGenericType)
                {
                    string fp = forVals[forIdx];

                    // class转struct传入引用ref, 数组先clear避免引入脏数据
                    if (convMode == ConvertMode.ClassToStruct)
                    {
                        WriteIndent(indentNum);
                        if (prefix != null)
                        {
                            line = $"{dst}.{prefix}.{field.Name}.Clear();";
                        }
                        else
                        {
                            line = $"{dst}.{field.Name}.Clear();";
                        }
                        WriteLine(fileName, line);
                    }

                    WriteIndent(indentNum);
                    if (prefix != null)
                    {
                        line = string.Format("for (int {0} = 0; {0} < {3}.{1}.{2}.Count; ++{0})", fp, prefix, field.Name, src);
                    }
                    else
                    {
                        line = string.Format("for (int {0} = 0; {0} < {2}.{1}.Count; ++{0})", fp, field.Name, src);
                    }
                    WriteLine(fileName, line);

                    WriteIndent(indentNum);
                    WriteLine(fileName, "{");

                    if (fieldType.GetGenericArguments()[0].IsPrimitive)
                    {
                        WriteIndent(indentNum + 1);

                        if (prefix != null)
                        {
                            line = $"{dst}.{prefix}.{field.Name}.Add({src}.{prefix}.{field.Name}[{fp}]);";
                        }
                        else
                        {
                            line = $"{dst}.{field.Name}.Add({src}.{field.Name}[{fp}]);";
                        }

                        WriteLine(fileName, line);
                    }
                    else
                    {
                        string gname = fieldType.GetGenericArguments()[0].Name;
                        WriteIndent(indentNum + 1);

                        if (prefix != null)
                        {
                            line = $"{dst}.{prefix}.{field.Name}.Add(new {ns}.{gname}());";
                        }
                        else
                        {
                            line = $"{dst}.{field.Name}.Add(new {ns}.{gname}());";
                        }

                        WriteLine(fileName, line);

                        if (prefix != null)
                        {
                            newPrefix = string.Format("{0}.{1}[{2}]", prefix, field.Name, fp);
                        }
                        else
                        {
                            newPrefix = string.Format("{0}[{1}]", field.Name, fp);
                        }

                        StructToClass(fieldType.GetGenericArguments()[0], newPrefix, indentNum + 1, forIdx + 1, convMode);
                    }

                    WriteIndent(indentNum);
                    WriteLine(fileName, "}");
                }
                else if (fieldType.IsClass)
                {
                    if (prefix != null)
                    {
                        newPrefix = $"{prefix}.{field.Name}";
                    }
                    else
                    {
                        newPrefix = field.Name;
                    }

                    StructToClass(fieldType, newPrefix, indentNum, forIdx, convMode);
                }
            }
        }

        static void Main(string[] args)
        {
            string path = "./config";
            if (! File.Exists(path))
            {
                Console.WriteLine("path {0} not exist", path);
                return;
            }

            var lines = File.ReadAllLines(path);
            if (lines.Length <= 0)
            {
                Console.WriteLine("config {0} no content", path);
                return;
            }

            if (File.Exists(fileName))
            {
                Console.WriteLine(" {0} exist, delete it", fileName);
                File.Delete(fileName);
            }

            fileStream = new FileStream(fileName, FileMode.CreateNew);

            WriteFileHead();

            foreach (string str in lines)
            {
                string name = str.Trim();
                if (!string.IsNullOrEmpty(name))
                {
                    Type clsType = Type.GetType("ProtoCSClass." + name);

                    WriteFuncHead(clsType, ConvertMode.ClassToStruct);
                    StructToClass(clsType, null, 3, 0, ConvertMode.ClassToStruct);
                    WriteFuncTail(ConvertMode.ClassToStruct);
                    WriteLine(fileName, "");

                
                    WriteFuncHead(clsType, ConvertMode.StructToClass);
                    StructToClass(clsType, null, 3, 0, ConvertMode.StructToClass);
                    WriteFuncTail(ConvertMode.StructToClass);
                    WriteLine(fileName, "");
                }
            }

            WriteFileTail();

            fileStream.Close();
        }
    }
}