public PBXBuildFile( PBXFileReference fileRef, bool weak = false )
            : base()
        {
            this.Add( FILE_REF_KEY, fileRef.guid );
            SetWeakLink( weak );

            //    def Create(cls, file_ref, weak=False):
            //        if isinstance(file_ref, PBXFileReference):
            //            file_ref = file_ref.id
            //
            //        bf = cls()
            //        bf.id = cls.GenerateId()
            //        bf['fileRef'] = file_ref
            //
            //        if weak:
            //            bf.set_weak_link(True)
            //
            //        return bf
        }
        //        public PBXDictionary<PBXBuildPhase> GetBuildPhase( string buildPhase )
        //        {
        //            switch( buildPhase ) {
        //                case "PBXFrameworksBuildPhase":
        //                    return (PBXDictionary<PBXBuildPhase>)frameworkBuildPhases;
        //                case "PBXResourcesBuildPhase":
        //                    return (PBXDictionary<PBXBuildPhase>)resourcesBuildPhases;
        //                case "PBXShellScriptBuildPhase":
        //                    return (PBXDictionary<PBXBuildPhase>)shellScriptBuildPhases;
        //                case "PBXSourcesBuildPhase":
        //                    return (PBXDictionary<PBXBuildPhase>)sourcesBuildPhases;
        //                case "PBXCopyFilesBuildPhase":
        //                    return (PBXDictionary<PBXBuildPhase>)copyBuildPhases;
        //                default:
        //                    return default(T);
        //            }
        //        }
        public PBXDictionary AddLocalization( string filePath, PBXVariantGroup parent = null, string tree = "SOURCE_ROOT", bool createBuildFiles = true, bool weak = false )
        {
            PBXDictionary results = new PBXDictionary();
            string absPath = string.Empty;

            if( Path.IsPathRooted( filePath ) ) {
                absPath = filePath;
                //				Debug.Log( "Is rooted: " + absPath );
            }
            else if( tree.CompareTo( "SDKROOT" ) != 0) {
                absPath = Path.Combine( Application.dataPath.Replace("Assets", ""), filePath );
                //				Debug.Log( "RElative: " + absPath );
            }

            if( !( File.Exists( absPath ) || Directory.Exists( absPath ) ) && tree.CompareTo( "SDKROOT" ) != 0 ) {
                Debug.Log( "Missing file: " + absPath + " > " + filePath );
                return results;
            }
            else if( tree.CompareTo( "SOURCE_ROOT" ) == 0 || tree.CompareTo( "GROUP" ) == 0 ) {
                System.Uri fileURI = new System.Uri( absPath );
                System.Uri rootURI = new System.Uri( ( projectRootPath + "/." ) );
                filePath = rootURI.MakeRelativeUri( fileURI ).ToString();
            }
            //			else {
            //				tree = "<absolute>";
            //				Debug.Log( "3: " + filePath );
            //			}
            //			Debug.Log( "Add file result path: " + filePath );

            // TODO: Aggiungere controllo se file già presente
            string filename=System.IO.Path.GetFileName (filePath);
            PBXFileReference fileReference = GetFile (System.IO.Path.GetFileName (filePath));
            if (filename.CompareTo ("common.strings") != 0) {
                if (fileReference != null) {
                    //				Debug.Log( "File già presente." );
                    return null;
                }
            }
            fileReference = new PBXFileReference( filePath, (TreeEnum)System.Enum.Parse( typeof(TreeEnum), tree ) );
            parent.AddChild( fileReference );
            fileReferences.Add( fileReference );
            results.Add( fileReference.guid, fileReference );

            //Create a build file for reference
            if( !string.IsNullOrEmpty( fileReference.buildPhase ) && createBuildFiles ) {
                //				PBXDictionary<PBXBuildPhase> currentPhase = GetBuildPhase( fileReference.buildPhase );
                PBXBuildFile buildFile;
                switch( fileReference.buildPhase ) {
                case "PBXFrameworksBuildPhase":
                    foreach( KeyValuePair<string, PBXFrameworksBuildPhase> currentObject in frameworkBuildPhases ) {
                        buildFile = new PBXBuildFile( fileReference, weak );
                        buildFiles.Add( buildFile );
                        currentObject.Value.AddBuildFile( buildFile );
                    }

                    if ( !string.IsNullOrEmpty( absPath ) && File.Exists(absPath) && tree.CompareTo( "SOURCE_ROOT" ) == 0 ) {
                        //Debug.LogError(absPath);
                        string libraryPath = Path.Combine( "$(SRCROOT)", Path.GetDirectoryName( filePath ) );
                        this.AddLibrarySearchPaths( new PBXList(libraryPath) );
                    }
                    else if (!string.IsNullOrEmpty( absPath ) && Directory.Exists(absPath) && absPath.EndsWith(".framework") && tree.CompareTo("GROUP") == 0) { // Annt: Add framework search path for FacebookSDK
                        string frameworkPath = Path.Combine( "$(SRCROOT)", Path.GetDirectoryName( filePath ) );
                        this.AddFrameworkSearchPaths(new PBXList(frameworkPath));
                    }
                    break;
                case "PBXResourcesBuildPhase":
                    foreach( KeyValuePair<string, PBXResourcesBuildPhase> currentObject in resourcesBuildPhases ) {
                        buildFile = new PBXBuildFile( fileReference, weak );
                        buildFiles.Add( buildFile );
                        currentObject.Value.AddBuildFile( buildFile );
                    }
                    break;
                case "PBXShellScriptBuildPhase":
                    foreach( KeyValuePair<string, PBXShellScriptBuildPhase> currentObject in shellScriptBuildPhases ) {
                        buildFile = new PBXBuildFile( fileReference, weak );
                        buildFiles.Add( buildFile );
                        currentObject.Value.AddBuildFile( buildFile );
                    }
                    break;
                case "PBXSourcesBuildPhase":
                    foreach( KeyValuePair<string, PBXSourcesBuildPhase> currentObject in sourcesBuildPhases ) {
                        buildFile = new PBXBuildFile( fileReference, weak );
                        buildFiles.Add( buildFile );
                        currentObject.Value.AddBuildFile( buildFile );
                    }
                    break;
                case "PBXCopyFilesBuildPhase":
                    foreach( KeyValuePair<string, PBXCopyFilesBuildPhase> currentObject in copyBuildPhases ) {
                        buildFile = new PBXBuildFile( fileReference, weak );
                        buildFiles.Add( buildFile );
                        currentObject.Value.AddBuildFile( buildFile );
                    }
                    break;
                case null:
                    Debug.LogWarning( "fase non supportata null" );
                    break;
                default:
                    Debug.LogWarning( "fase non supportata def" );
                    return null;
                }
            }

            return results;
        }
        public PBXDictionary AddFile( string filePath, PBXGroup parent = null, string tree = "SOURCE_ROOT", bool createBuildFiles = true, bool weak = false )
        {
            PBXDictionary results = new PBXDictionary();
            string absPath = string.Empty;

            if( Path.IsPathRooted( filePath ) ) {
                absPath = filePath;
            //				Debug.Log( "Is rooted: " + absPath );
            }
            else if( tree.CompareTo( "SDKROOT" ) != 0) {
                absPath = Path.Combine( Application.dataPath.Replace("Assets", ""), filePath );
            //				Debug.Log( "RElative: " + absPath );
            }

            if( !( File.Exists( absPath ) || Directory.Exists( absPath ) ) && tree.CompareTo( "SDKROOT" ) != 0 ) {
                Debug.Log( "Missing file: " + absPath + " > " + filePath );
                return results;
            }
            else if( tree.CompareTo( "SOURCE_ROOT" ) == 0 || tree.CompareTo( "GROUP" ) == 0 ) {
                System.Uri fileURI = new System.Uri( absPath );
                System.Uri rootURI = new System.Uri( ( projectRootPath + "/." ) );
                filePath = rootURI.MakeRelativeUri( fileURI ).ToString();
            }
            //			else {
            //				tree = "<absolute>";
            //				Debug.Log( "3: " + filePath );
            //			}
            //			Debug.Log( "Add file result path: " + filePath );

            if( parent == null ) {
                parent = _rootGroup;
            }

            // TODO: Aggiungere controllo se file già presente
            string filename=System.IO.Path.GetFileName (filePath);
            PBXFileReference fileReference = GetFile (System.IO.Path.GetFileName (filePath));
            if (fileReference != null) {
            //				Debug.Log( "File già presente." );
                return null;
            }
            fileReference = new PBXFileReference( filePath, (TreeEnum)System.Enum.Parse( typeof(TreeEnum), tree ) );
            parent.AddChild( fileReference );
            fileReferences.Add( fileReference );
            results.Add( fileReference.guid, fileReference );

            //Create a build file for reference
            if( !string.IsNullOrEmpty( fileReference.buildPhase ) && createBuildFiles ) {
            //				PBXDictionary<PBXBuildPhase> currentPhase = GetBuildPhase( fileReference.buildPhase );
                PBXBuildFile buildFile;
                switch( fileReference.buildPhase ) {
                    case "PBXFrameworksBuildPhase":
                        foreach( KeyValuePair<string, PBXFrameworksBuildPhase> currentObject in frameworkBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }

                        if ( !string.IsNullOrEmpty( absPath ) && File.Exists(absPath) && tree.CompareTo( "SOURCE_ROOT" ) == 0 ) {
                            //Debug.LogError(absPath);
                            string libraryPath = Path.Combine( "$(SRCROOT)", Path.GetDirectoryName( filePath ) );
                            this.AddLibrarySearchPaths( new PBXList(libraryPath) );
                        }
                        else if (!string.IsNullOrEmpty( absPath ) && Directory.Exists(absPath) && absPath.EndsWith(".framework") && tree.CompareTo("GROUP") == 0) { // Annt: Add framework search path for FacebookSDK
                            string frameworkPath = Path.Combine( "$(SRCROOT)", Path.GetDirectoryName( filePath ) );
                            this.AddFrameworkSearchPaths(new PBXList(frameworkPath));
                        }
                        break;
                    case "PBXResourcesBuildPhase":
                        foreach( KeyValuePair<string, PBXResourcesBuildPhase> currentObject in resourcesBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case "PBXShellScriptBuildPhase":
                        foreach( KeyValuePair<string, PBXShellScriptBuildPhase> currentObject in shellScriptBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case "PBXSourcesBuildPhase":
                        foreach( KeyValuePair<string, PBXSourcesBuildPhase> currentObject in sourcesBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case "PBXCopyFilesBuildPhase":
                        foreach( KeyValuePair<string, PBXCopyFilesBuildPhase> currentObject in copyBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case null:
                        Debug.LogWarning( "fase non supportata null" );
                        break;
                    default:
                        Debug.LogWarning( "fase non supportata def" );
                        return null;
                }
            }

            //			Debug.Log( "Results " + results.Count + " - " );
            //			foreach( KeyValuePair<string, object> obj in results ){
            //				Debug.Log( obj.Key + " - " + obj.Value.GetType().Name );
            //			}
            return results;

            //		def add_file(self, f_path, parent=None, tree='SOURCE_ROOT', create_build_files=True, weak=False):
            //        results = []
            //
            //        abs_path = ''
            //
            //        if os.path.isabs(f_path):
            //            abs_path = f_path
            //
            //            if not os.path.exists(f_path):
            //                return results
            //            elif tree == 'SOURCE_ROOT':
            //                f_path = os.path.relpath(f_path, self.source_root)
            //            else:
            //                tree = '<absolute>'
            //
            //        if not parent:
            //            parent = self.root_group
            //        elif not isinstance(parent, PBXGroup):
            //            # assume it's an id
            //            parent = self.objects.get(parent, self.root_group)
            //
            //        file_ref = PBXFileReference.Create(f_path, tree)
            //        parent.add_child(file_ref)
            //        results.append(file_ref)
            //        # create a build file for the file ref
            //        if file_ref.build_phase and create_build_files:
            //            phases = self.get_build_phases(file_ref.build_phase)
            //
            //            for phase in phases:
            //                build_file = PBXBuildFile.Create(file_ref, weak=weak)
            //
            //                phase.add_build_file(build_file)
            //                results.append(build_file)
            //
            //            if abs_path and tree == 'SOURCE_ROOT' and os.path.isfile(abs_path)\
            //                and file_ref.build_phase == 'PBXFrameworksBuildPhase':
            //
            //                library_path = os.path.join('$(SRCROOT)', os.path.split(f_path)[0])
            //
            //                self.add_library_search_paths([library_path], recursive=False)
            //
            //        for r in results:
            //            self.objects[r.id] = r
            //
            //        if results:
            //            self.modified = True
            //
            //        return results
        }