using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace ProtoCSStruct
{
    public class CSharpStructWriter
    {
        //所有fixed 长度大小的string类,int表示长度，为了减少类型数量，长度必须是8的倍数
        private HashSet<int> AllFixStringClass;

        //所有repeated struct 的类型
        private HashSet<string> AllRepeatedStructSet;
        //需要按申明顺序保存
        private List<ProtoMessageField> AllRepeatedStructList;

        public CSharpStructWriter()
        {
            AllFixStringClass = new HashSet<int>();
            AllRepeatedStructSet = new HashSet<string>();
            AllRepeatedStructList = new List<ProtoMessageField>();
        }

        public void WriteCSStructFile()
        {
            //固定长度的string类型 FixedRepeatedStruct
            WriteAllFixRepeatedClass();

            //协议文件
            WriteAllProtoFile();
        }

        private void WriteAllFixRepeatedClass()
        {
            string outfile = ProtoDescriptorAll.Instance.AllProtoDescriptor[0].OutPutPath + "/FixedRepeatedStruct.cs";
            string nameSpace = ProtoDescriptorAll.Instance.AllProtoDescriptor[0].NameSpace;
            FileWriter fw = new FileWriter(outfile);

            fw.Write(Define.FileHeader);
            fw.Write(
                "",
                "using System;",
                "using System.Text;",
                "",
                "namespace " + nameSpace,
                "{",
                ""
                );

            fw.Indent();

            WriteFixStringClass(fw);
            WriteRepeatedStructClass(fw);

            fw.Outdent();
            fw.Write("}");//namespace

            fw.WriteToFile();

            Console.WriteLine("generator  {0} success", outfile);
        }

        private void WriteFixStringClass(FileWriter fw)
        {
            GetAllFixedString();

            foreach (var length in AllFixStringClass)
            {
                FixedStringWriter fsw = new FixedStringWriter();
                fsw.Write(length, fw);
            }
        }

        private void WriteRepeatedStructClass(FileWriter fw)
        {
            GetAllRepeatedStructClass();

            foreach (var repeatedstruct in AllRepeatedStructList)
            {
                RepeatedStructWriter rsw = new RepeatedStructWriter();
                rsw.Write(repeatedstruct,fw);
            }
        }

        private void GetAllFixedString()
        {
            foreach (var pd in ProtoDescriptorAll.Instance.AllProtoDescriptor)
            {
                foreach (var message in pd.Messages)
                {
                    foreach (var field in message.Fields)
                    {
                        if (field.FieldType == FieldType.String)
                        {
                            if (AllFixStringClass.Contains(field.StringLength) == false)
                            {
                                AllFixStringClass.Add(field.StringLength);
                            }
                        }
                    }
                }
            }

            //AllFixStringClass = AllFixStringClass.OrderBy(o => o).to
        }

        private void GetAllRepeatedStructClass()
        {
            foreach (var pd in ProtoDescriptorAll.Instance.AllProtoDescriptor)
            {
                foreach (var message in pd.Messages)
                {
                    foreach (var field in message.Fields)
                    {
                        if (field.IsRepeated == false && field.FieldType != FieldType.Bytes)
                        {
                            continue;
                        }

                        //生成的repeated class 名字, 类似
                        string repeatedclassname = field.GetRepeatedFiledTypeNameInCSharp();

                        if (repeatedclassname != null)
                        {
                            if (AllRepeatedStructSet.Contains(repeatedclassname) == false)
                            {
                                AllRepeatedStructSet.Add(repeatedclassname);
                                AllRepeatedStructList.Add(field);
                            }
                        }
                    }
                }
            }
        }

        private void WriteAllProtoFile()
        {
            foreach (var pd in ProtoDescriptorAll.Instance.AllProtoDescriptor)
            {
                WriteProtoFile(pd);
                
              
            }
        }



        private void WriteProtoFile(ProtoDescriptor pd)
        {
            string outfile = pd.OutPutFile;
            string nameSpace = pd.NameSpace;
            FileWriter fw = new FileWriter(outfile);

            fw.Write(Define.FileHeader);
            fw.Write(
                "using System;",
                "",
                "namespace " + nameSpace,
                "{",
                ""
                );

            fw.Indent();

            WriteAllMessage(pd, fw);

            fw.Outdent();
            fw.Write("}");//namespace

            fw.WriteToFile();
            Console.WriteLine("generator csharp file {0} success", outfile);
            
            //枚举单独写一个文件，方便共享
            WriteAllEnums(pd);
                
            //需要生成class描述的message单独生成一个文件
            WriteMessageClassDesc(pd);
        }

        private void WriteAllEnums(ProtoDescriptor pd)
        {
            FileWriter fw = new FileWriter(pd.EnumOutPutFile);
            fw.Write(Define.FileHeader);
            fw.Write(
                "using System;",
                "",
                "namespace " + pd.NameSpace,
                "{",
                ""
            );
            fw.Indent();

            fw.Write("//");
            fw.Write("//enum");
            fw.Write("//");
            fw.Write("#region Enums");
            fw.Write("");

            EnumWriter ew = new EnumWriter();
            foreach (var oneEnum in pd.Enums)
            {
                ew.Write(oneEnum, fw);
            }

            fw.Write("");
            fw.Write("#endregion");

            fw.Outdent();
            fw.Write("}");//namespace

            fw.WriteToFile();
            Console.WriteLine("generator csharp file {0} success", pd.EnumOutPutFile);
        }

        private void WriteAllMessage(ProtoDescriptor pd, FileWriter fw)
        {
            MessageWriter mw = new MessageWriter();

            fw.Write("//");
            fw.Write("//message");
            fw.Write("//");
            fw.Write("#region Messages");
            fw.Write("");

            foreach (var message in pd.Messages)
            {
                mw.Write(message, fw);
            }

            fw.Write("");
            fw.Write("#endregion");
        }

        private void WriteMessageClassDesc(ProtoDescriptor pd)
        {
            if (pd.MessagesNeedClassDesc.Count == 0)
            {
                return;
            }

            MessageWriter mw = new MessageWriter();
            
            FileWriter fw = new FileWriter(pd.ClassOutPutFile);
            fw.Write(Define.FileHeader);
            fw.Write(
                //"#if ILRUNTIME_MODE",
                //"",
                "using System;",
                "using System.Collections.Generic;",
                "using BinarySerialize;",
                "using System.IO;",
                "",
                "namespace " + pd.NameSpace,
                "{",
                ""
            );
            fw.Indent();

            fw.Write("//");
            fw.Write("//class desc");
            fw.Write("//");
            fw.Write("#region ClassDesc");
            fw.Write("");

            foreach (var message in pd.MessagesNeedClassDesc)
            {
                mw.WriteClassDesc(message, fw);
            }

            fw.Write("");
            fw.Write("#endregion");

            fw.Outdent();
            fw.Write("}");//namespace
            //fw.Write("");
            //fw.Write("#endif");

            fw.WriteToFile();
            
            Console.WriteLine("generator csharp file {0} success", pd.ClassOutPutFile);
        }
    }
}