using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

using UnityEditor;

namespace ET
{
	[Flags]
	public enum HeadFlag
	{
		None = 0,
		Bson = 1,
		Proto = 2,
	}
	
	public static class InnerProto2CS
	{
		private const string protoPath = "../Proto/";
		private const string serverMessagePath = "../Server/Model/Module/Message/";
		private static readonly char[] splitChars = { ' ', '\t' };
		private static readonly List<OpcodeInfo> msgOpcode = new List<OpcodeInfo>();
		
		
		public static void Proto2CS()
		{
			msgOpcode.Clear();
			Proto2CS("ETModel", "InnerMessage.proto", serverMessagePath, "InnerOpcode", 1000);
			GenerateOpcode("ETModel", "InnerOpcode", serverMessagePath);

			AssetDatabase.Refresh();
		}
		
		public static void Proto2CS(string ns, string protoName, string outputPath, string opcodeClassName, int startOpcode)
		{
			msgOpcode.Clear();
			string proto = Path.Combine(protoPath, protoName);
			string csPath = Path.Combine(outputPath, Path.GetFileNameWithoutExtension(proto) + ".cs");

			string s = File.ReadAllText(proto);

			StringBuilder sb = new StringBuilder();
			sb.Append("\n");
			sb.Append("using System.Collections.Generic;\n");
			sb.Append($"namespace {ns}\n");
			sb.Append("{\n");

			bool isMsgStart = false;
			string parentClass = "";
			foreach (string line in s.Split('\n'))
			{
				string newline = line.Trim();

				if (newline == "")
				{
					continue;
				}

				if (newline.StartsWith("//"))
				{
					sb.Append($"{newline}\n");
				}

				if (newline.StartsWith("message"))
				{
					parentClass = "";
					isMsgStart = true;
					string msgName = newline.Split(splitChars, StringSplitOptions.RemoveEmptyEntries)[1];
					string[] ss = newline.Split(new []{"//"}, StringSplitOptions.RemoveEmptyEntries);
					
					if (ss.Length == 2)
					{
						parentClass = ss[1].Trim();
					}

					msgOpcode.Add(new OpcodeInfo() { Name = msgName, Opcode = ++startOpcode});
					
					sb.Append($"\t[Message({opcodeClassName}.{msgName})]\n");
					sb.Append($"\tpublic partial class {msgName}");
					if (parentClass == "IActorMessage" || parentClass == "IActorRequest" || parentClass == "IActorResponse")
					{
						sb.Append($": {parentClass}\n");
					}
					else if (parentClass != "")
					{
						sb.Append($": {parentClass}\n");
					}
					else
					{
						sb.Append("\n");
					}
					continue;
				}

				if (isMsgStart)
				{
					if (newline == "{")
					{
						sb.Append("\t{\n");
						continue;
					}
					
					if (newline == "}")
					{
						isMsgStart = false;
						sb.Append("\t}\n\n");
						continue;
					}

					if (newline.Trim().StartsWith("//"))
					{
						sb.AppendLine(newline);
						continue;
					}

					if (newline.Trim() != "" && newline != "}")
					{
						if (newline.StartsWith("repeated"))
						{
							Repeated(sb, ns, newline);
						}
						else
						{
							Members(sb, newline, true);
						}
					}
				}
			}
			sb.Append("}\n");

			File.WriteAllText(csPath, sb.ToString());
		}

		private static void GenerateOpcode(string ns, string outputFileName, string outputPath)
		{
			StringBuilder sb = new StringBuilder();
			sb.AppendLine($"namespace {ns}");
			sb.AppendLine("{");
			sb.AppendLine($"\tpublic static partial class {outputFileName}");
			sb.AppendLine("\t{");
			foreach (OpcodeInfo info in msgOpcode)
			{
				sb.AppendLine($"\t\t public const ushort {info.Name} = {info.Opcode};");
			}
			sb.AppendLine("\t}");
			sb.AppendLine("}");
			
			string csPath = Path.Combine(outputPath, outputFileName + ".cs");
			File.WriteAllText(csPath, sb.ToString());
		}

		private static void Repeated(StringBuilder sb, string ns, string newline)
		{
			try
			{
				int index = newline.IndexOf(";");
				newline = newline.Remove(index);
				string[] ss = newline.Split(splitChars, StringSplitOptions.RemoveEmptyEntries);
				string type = ss[1];
				type = ConvertType(type);
				string name = ss[2];

				sb.Append($"\t\tpublic List<{type}> {name} = new List<{type}>();\n\n");
			}
			catch (Exception e)
			{
				Log.Error($"{newline}\n {e}");
			}

		}

		private static string ConvertType(string type)
		{
			string typeCs = "";
			switch (type)
			{
				case "int16":
					typeCs = "short";
					break;
				case "int32":
					typeCs = "int";
					break;
				case "bytes":
					typeCs = "byte[]";
					break;
				case "uint32":
					typeCs = "uint";
					break;
				case "long":
					typeCs = "long";
					break;
				case "int64":
					typeCs = "long";
					break;
				case "uint64":
					typeCs = "ulong";
					break;
				case "uint16":
					typeCs = "ushort";
					break;
				default:
					typeCs = type;
					break;
			}
			return typeCs;
		}

		private static void Members(StringBuilder sb, string newline, bool isRequired)
		{
			try
			{
				int index = newline.IndexOf(";");
				newline = newline.Remove(index);
				string[] ss = newline.Split(splitChars, StringSplitOptions.RemoveEmptyEntries);
				string type = ss[0];
				string name = ss[1];
				string typeCs = ConvertType(type);

				sb.Append($"\t\tpublic {typeCs} {name} {{ get; set; }}\n\n");
			}
			catch (Exception e)
			{
				Log.Error($"{newline}\n {e}");
			}

		}
	}
}