public PBXBuildFile( PBXFileReference fileRef, bool weak = false ) : base()
		{
			string buildFileGuid = generateBuildFileGuid(fileRef);
			this.guid = buildFileGuid;
			this.Add( FILE_REF_KEY, fileRef.guid );
			SetWeakLink( weak );
			name = fileRef.name;
		}
		private string generateBuildFileGuid(PBXFileReference fileRef) {
			string buildFileGuid = GenerateGuid();
            //todo generate with "from ..." section of comment
			buildFileGuid += " /* " + fileRef.name + " */";
			return buildFileGuid;
		}
		public PBXDictionary AddFile( string filePath, PBXGroup parent = null, string tree = "SOURCE_ROOT", bool createBuildFiles = true, bool weak = false, string[] compilerFlags = null )
		{
			PBXDictionary results = new PBXDictionary();
			string absPath = string.Empty;
			
			if( Path.IsPathRooted( filePath ) ) {
				absPath = filePath;
			}
			else if( tree.CompareTo( "SDKROOT" ) != 0) {
				absPath = Path.Combine( Application.dataPath, filePath );
			}
			
			if( tree.CompareTo( "SOURCE_ROOT" ) == 0 ) {
				System.Uri fileURI = new System.Uri( absPath );
				System.Uri rootURI = new System.Uri( ( projectRootPath + "/." ) );
				filePath = rootURI.MakeRelativeUri( fileURI ).ToString();
			}
			
			if( parent == null ) {
				parent = _rootGroup;
			}
			
			// TODO: Aggiungere controllo se file giĆ  presente
			String filename = System.IO.Path.GetFileName (filePath);
			if (filename.Contains("+")) {
				filename = string.Format ("\"{0}\"", filename);
			}

			PBXFileReference fileReference = GetFile(filename); 

			if (fileReference != null) {
				//Weak references always taks precedence over strong reference
                if (weak) {
					PBXBuildFile buildFile = GetBuildFile(fileReference.guid);
					if(buildFile != null) {
						buildFile.SetWeakLink(weak);
					}
				}
				// Dear future me: If they ever invent a time machine, please don't come back in time to hunt me down.
				// From Unity 5, AdSupport is loaded dinamically, meaning that there will be a reference to the
				// file in the project and it won't add it to the linking libraries. And we need that.
				// TODO: The correct solution would be to check inside each phase if that file is already present.
				if (filename.Contains("AdSupport.framework")) {
					if (string.IsNullOrEmpty(fileReference.buildPhase)) {
						fileReference.buildPhase = "PBXFrameworksBuildPhase";
					}
				} else {
					return null;
				}

			}

			if (fileReference == 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 ) {
				PBXBuildFile buildFile;
				switch( fileReference.buildPhase ) {
					case "PBXFrameworksBuildPhase":
						foreach( KeyValuePair<string, PBXFrameworksBuildPhase> currentObject in frameworkBuildPhases ) {
							PBXBuildFile newBuildFile = GetBuildFile(fileReference.guid);
							if (newBuildFile == null){
								newBuildFile = new PBXBuildFile( fileReference, weak );
								buildFiles.Add( newBuildFile );
							}

							if (currentObject.Value.HasBuildFile(newBuildFile.guid)) {
								continue;
							}
							currentObject.Value.AddBuildFile( newBuildFile );

						}
						if ( !string.IsNullOrEmpty( absPath ) && ( tree.CompareTo( "SOURCE_ROOT" ) == 0 ) && File.Exists( absPath ) ) {
							string libraryPath = Path.Combine( "$(SRCROOT)", Path.GetDirectoryName( filePath ) );
							this.AddLibrarySearchPaths( new PBXList( libraryPath ) ); 
						}
						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 );
							foreach (string flag in compilerFlags) {
								buildFile.AddCompilerFlag(flag);
							}
							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;
			
		}