using Godot;

using Rokojori;
using System.Collections.Generic;
using System;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

namespace Rokojori.GDLibraryGeneration
{  
  [Tool][GlobalClass]
  public partial class GDLibraryGenerator:Node
  {  
    [Export]
    public string path = "rokojori_action_library_gd";

    [Export]
    public bool scanForGDExport = true;

    [Export]
    public string[] files = [];

    [ExportToolButton( "Generate" )]
    public Callable generateButton => Callable.From(
      ()=>
      {
        GenerateGDLibrary();
      }
    );

    HashSet<string> defines = new HashSet<string>();

    void GenerateGDLibrary()
    {
      defines = new HashSet<string>();
      defines.Add( GDScriptGenerator.GD_SCRIPT_TRANSPILING );

      var codeFilePaths = GetCodeFilePaths();
      



      var rokojoriProPath = FilePath.Absolute( ProjectSettings.GlobalizePath( RokojoriPlugin.path ) );
      var rokojoriGDPath  = FilePath.Absolute( ProjectSettings.GlobalizePath( "res://addons/" + path ) );

      
      codeFilePaths.ForEach(
        ( c )=>
        {
          var parser = new CSParser( c.absolutePath, defines );
          var root = parser.root as CSFileRoot;

          var originalPath = FilePath.Absolute( root.GetFilePath() );
          var relativePath = rokojoriProPath.MakeAbsolutePathRelative( originalPath.parentAbsolutePath );
          var gdPath = rokojoriGDPath.MakeRelative( relativePath.path );

          var converter = new GDScriptFromCSAST();
          converter.Convert( root );
          var gdclass = converter.gdClass;

          var gdgenerator = new GDScriptGenerator();
          gdgenerator.gdClasses = [ gdclass ];

          FilesSync.EnsureDirectoryExists( gdPath.absolutePath );
          gdgenerator.Generate( gdPath.absolutePath );
        }
      );


     

    } 

    List<FilePath> GetCodeFilePaths()
    {
      var codeFilePaths = new List<FilePath>();

      var map = new HashSet<string>();

      var combinedFiles = new List<string>();

      combinedFiles.AddRange( files );

      if ( scanForGDExport )
      {
        var absPath = ProjectSettings.GlobalizePath( RokojoriPlugin.path );
        var scannedExportfiles = FilesSync.GetFilesRecursive( absPath, f => f.HasFileExtension( ".cs" ) );
        scannedExportfiles = scannedExportfiles.Filter(
          ( f, i ) => 
          {
            var text = f.LoadUTF8();

            if ( ! text.Contains( "GDExport" ) )
            {
              return false;
            }

            var parser = new CSParser( f.absolutePath, defines );
            var csRoot = parser.root as CSFileRoot;
            var cd = csRoot.GetObjectDeclarations().Find( c => c.objectName.match == f.fileName );

            return cd?.GetMemberAttributes().Contains( "GDExport" ) ?? false;
          }
        );


        var scannedPaths = scannedExportfiles.Map( f => f.absolutePath );

        RJLog.Log( "Found paths:", scannedPaths );
        combinedFiles.AddRange( scannedPaths );

      }

      combinedFiles.ForEach(
        ( fileString )=>
        {
          FilePath filePath;

          if ( fileString.StartsWith( "res://" ) )
          {
            filePath = FilePath.Absolute( ProjectSettings.GlobalizePath( fileString ) );
          }
          else if ( ! fileString.EndsWith( ".cs" ) )
          {
            filePath = FindFilePathOf( fileString );
          }
          else 
          {
            filePath = FilePath.Absolute( fileString );
          }

          if ( filePath == null || ! filePath.Exists() )
          {
            return;
          }

          var absolutePath = filePath.absolutePath;

          if ( map.Contains( absolutePath ) )
          {
            return;
          }

          codeFilePaths.Add( filePath );
          map.Add( absolutePath );
        }
      );

      return codeFilePaths;
    }

    

    List<FilePath> filePaths;

    FilePath FindFilePathOf( string type )
    {
      if ( filePaths == null )
      {
        var rokojoriPath = ProjectSettings.GlobalizePath( RokojoriPlugin.path );
        filePaths = FilesSync.GetFilesRecursive( rokojoriPath, fp => fp.HasFileExtension( ".cs" ) );
      }

      return filePaths.Find( fp => fp.fileName == type );
    }
  
  }
}