feat: add comments

lib/models/input_direction.dart

@@ -3,7 +3,8 @@ class InputDirection {
   bool down = false;
   bool left = false;
   bool right = false;
-
+  
+  /// reset all directions to false
   void reset() {
     up = false;
     down = false;

lib/screens/level.dart

@@ -87,6 +87,7 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
       }
     });
 
+    // go to GameOverStats when level finishes
     player.onPlayerComplete.listen((void _) {
       Route route = MaterialPageRoute(
           builder: (context) => GameOverStats(
@@ -105,6 +106,7 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
       });
     }
 
+    // convert beats to notes
     widget.simfile.chartSimplest?.beats.forEach((time, noteData) {
       int arrowIndex = noteData.indexOf('1');
       if (arrowIndex < 0 || arrowIndex > 3) {
@@ -126,6 +128,7 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
     super.dispose();
   }
 
+  /// toggle between pause and resume
   void _pauseResume() {
     if (_isPlaying) {
       player.pause();
@@ -140,18 +143,24 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
     }
   }
 
+  /// checks if the [note] is hit on [time] with the correct InputDirection
   void _noteHitCheck(Note note, Duration time) {
     note.position = note.time - time.inMilliseconds / 60000.0;
     if (note.wasHit != null) {
       return;
     }
+
+    // you have +- half a second to hit
     if (note.position.abs() < 0.5 * 1.0 / 60.0) {
+      // combine keyboard and esense input
       InputDirection esenseDirection =
           ESenseInput.instance.getInputDirection(note.direction);
       inputDirection.up |= esenseDirection.up;
       inputDirection.down |= esenseDirection.down;
       inputDirection.left |= esenseDirection.left;
       inputDirection.right |= esenseDirection.right;
+
+      // check if input matches arrow direction
       bool keypressCorrect = false;
       switch (note.direction) {
         case ArrowDirection.up:
@@ -189,6 +198,7 @@ class _LevelState extends State<Level> with SingleTickerProviderStateMixin {
     }
   }
 
+  /// sets the InputDirection based on the arrow keys
   void _keyboardHandler(event) {
     bool isDown = false;
     if (event is KeyDownEvent) {

lib/screens/level_selection.dart

@@ -28,6 +28,7 @@ class _LevelSelectionState extends State<LevelSelection> {
     loadFolderPath();
   }
 
+  /// gets folder path from persistent storage and updates state with loaded simfiles
   Future<void> loadFolderPath() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
     final String? stepmaniaCoursesPathSetting =
@@ -44,6 +45,7 @@ class _LevelSelectionState extends State<LevelSelection> {
     });
   }
 
+  /// open folder selection dialog and save selected folder in persistent storage
   Future<void> selectFolder() async {
     await Permission.manageExternalStorage.request();
     String? selectedFolder = await FilePicker.platform.getDirectoryPath();
@@ -57,6 +59,7 @@ class _LevelSelectionState extends State<LevelSelection> {
     }
   }
 
+  /// load all simfiles from a [directoryPath]
   Future<List<Simfile>> listFilesAndFolders(String directoryPath) async {
     final directory = Directory(directoryPath);
     try {
@@ -86,6 +89,7 @@ class _LevelSelectionState extends State<LevelSelection> {
     }
   }
 
+  /// filter stepmaniaCoursesFolders based on [input]
   void filterLevels(String input) {
     setState(() {
       stepmaniaCoursesFoldersFiltered = stepmaniaCoursesFolders

lib/utils/esense_input.dart

@@ -8,9 +8,12 @@ import 'package:sense_the_rhythm/models/arrow_direction.dart';
 import 'package:sense_the_rhythm/models/input_direction.dart';
 
 class ESenseInput {
+  // create singleton that is available on all widgets so it does not have to be
+  // carried down in the widget tree
   static final instance = ESenseInput._();
 
   ESenseManager eSenseManager = ESenseManager('unknown');
+  // valuenotifier allows widgets to rerender when the value changes
   ValueNotifier<String> deviceStatus = ValueNotifier('Disconnected');
   StreamSubscription? subscription;
 
@@ -29,8 +32,11 @@ class ESenseInput {
     _listenToESense();
   }
 
+  /// ask and check if permissions are enabled and granted
   Future<bool> _askForPermissions() async {
+    // is desktop
     if (!Platform.isAndroid && !Platform.isIOS) return false;
+    // is bluetooth even enabled?
     if (!await Permission.bluetooth.serviceStatus.isEnabled) {
       deviceStatus.value = "Bluetooth is disabled!";
       return false;
@@ -55,6 +61,7 @@ class ESenseInput {
     return true;
   }
 
+  /// listen to connectionEvents and set deviceStatus
   void _listenToESense() {
     // if you want to get the connection events when connecting,
     // set up the listener BEFORE connecting...
@@ -89,12 +96,14 @@ class ESenseInput {
     });
   }
 
+  /// get eSenseEvent stream only containung button events
   Stream<ButtonEventChanged> buttonEvents() {
     return eSenseManager.eSenseEvents
         .where((event) => event.runtimeType == ButtonEventChanged)
         .cast();
   }
 
+  /// sets sampling rate and listens to sensorEvents
   void _startListenToSensorEvents() async {
     // // any changes to the sampling frequency must be done BEFORE listening to sensor events
     print('setting sampling frequency...');
@@ -115,11 +124,14 @@ class ESenseInput {
     sampling = true;
   }
 
+  /// cancels the sensorEvents listening
   void _pauseListenToSensorEvents() async {
     subscription?.cancel();
     sampling = false;
   }
 
+  /// add up all new gyro [data] in the form of deg/s multiplied by scaling factor
+  /// to get real angles
   void _parseGyroData(List<int> data) {
     // Float value in deg/s = Gyro value / Gyro scale factor
     // The default configuration is +- 500deg/s for the gyroscope.
@@ -131,6 +143,7 @@ class ESenseInput {
     // print('${z.toDouble() / 500.0 * (1.0 / 10.0)}');
   }
 
+  /// nulls all angles and reset inputDirection
   void resetAngles() {
     inputDirection.reset();
     x = 0;
@@ -138,26 +151,29 @@ class ESenseInput {
     z = 0;
   }
 
+  /// get InputDirection by checking if angels are in defined ranges and
+  /// calibrating based on the [expect]ed direction from ArrowDirection
   InputDirection getInputDirection(ArrowDirection expect) {
+    // check if angle is in range
     inputDirection.up = z > 180 && z < 340;
     inputDirection.down = z > 20 && z < 180;
     inputDirection.left = y > 0 && y < 180;
     inputDirection.right = y > 180 && y < 360;
 
+    // calibrate based on expected directoin from ArrowDirection
     if (expect == ArrowDirection.up && inputDirection.up ||
         expect == ArrowDirection.down && inputDirection.down) {
       y = 0;
-      print("ehit");
     }
     if (expect == ArrowDirection.left && inputDirection.left ||
         expect == ArrowDirection.right && inputDirection.right) {
       z = 0;
-      print("ehit");
     }
 
     return inputDirection;
   }
 
+  /// connect to ESense with [deviceName] by first asking for permissions
   Future<void> connectToESense(String deviceName) async {
     if (!connected) {
       bool permissionSuccessfull = await _askForPermissions();

lib/utils/simfile.dart

@@ -55,6 +55,7 @@ class Simfile {
 
   Simfile(this.simfilePath);
 
+  /// parses a chart tag with metadata [keys] and note data [value]
   void _parseChart({required List<String> keys, required String value}) {
     Chart chart = Chart();
     chart.chartType = keys[1];
@@ -63,6 +64,7 @@ class Simfile {
     chart.numericalMeter = int.parse(keys[4]);
     chart.radarValues = keys[5];
 
+    // find simplest chart
     if (chartSimplest == null ||
         (chart.difficulty!.index <= chartSimplest!.difficulty!.index &&
             chart.numericalMeter! <= chartSimplest!.numericalMeter!)) {
@@ -78,8 +80,10 @@ class Simfile {
         measures.add(measure);
       }
 
+      // for now only use the first bpm value
       double bpm = bpms.entries.first.value;
 
+      // calculate timing for all notes based on offset, bpm and measure
       for (final (measureIndex, measure) in measures.indexed) {
         for (final (noteIndex, noteData) in measure.indexed) {
           double beat = measureIndex * 4.0 +
@@ -95,10 +99,13 @@ class Simfile {
     }
   }
 
+  /// parse a tag based on a regex match [fieldData] and parsing the value based
+  /// on the key
   void _parseTag(RegExpMatch fieldData) {
     List<String> keys =
         fieldData[1]!.split(':').map((key) => key.trim()).toList();
     String value = fieldData[2]!;
+
     if (keys[0] == "BPMS") {
       for (final pairRaw in value.split(',')) {
         List<String> pair = pairRaw.split('=');
@@ -122,14 +129,18 @@ class Simfile {
     _parseChart(keys: keys, value: value);
   }
 
+  /// load the simfile
   Future<bool> load() async {
     directoryPath = File(simfilePath).parent.path;
     lines = File(simfilePath).readAsStringSync();
     
+    // remove comments
     RegExp commentsRegExp = RegExp(r'//.*$');
     lines = lines?.replaceAll(commentsRegExp, '');
+    // find all tags
     RegExp fieldDataRegExp = RegExp(r'#([^;]+):([^;]*);');
 
+    // parse all tags
     for (final fieldData in fieldDataRegExp.allMatches(lines!)) {
       try {
         _parseTag(fieldData);
@@ -138,11 +149,8 @@ class Simfile {
       }
     }
 
-    String? musicFileName = tags["MUSIC"];
+    // searching for audio and banned in the directory is more robust than using
-    if (musicFileName == null) return false;
+    // values from metadata as they are wrong more often
-    String? bannerFileName = tags["BANNER"];
-    if (bannerFileName == null) return false;
-
     for (FileSystemEntity entity in Directory(directoryPath!).listSync()) {
       if (entity.path.endsWith('.ogg')) {
         audioPath = entity.path;
@@ -152,6 +160,11 @@ class Simfile {
       }
     }
 
+    // dont use this simfile of files are missing
+    if (audioPath == null) return false;
+    if (bannerPath == null) return false;
+
+    // get duration from audio
     AudioPlayer audioplayer = AudioPlayer();
     await audioplayer.setSource(DeviceFileSource(audioPath!));
     duration = await audioplayer.getDuration();

lib/widgets/esense_connect_dialog.dart

@@ -21,6 +21,7 @@ class _ESenseConnectDialogState extends State<ESenseConnectDialog> {
 
   @override
   Widget build(BuildContext context) {
+    // rerender whenever the deviceStatus changes
     return ValueListenableBuilder(
         valueListenable: widget.deviceStatus,
         builder: (BuildContext context, String deviceStatus, Widget? child) {

lib/widgets/level_list_entry.dart

@@ -16,11 +16,13 @@ class LevelListEntry extends StatelessWidget {
 
   final Simfile simfile;
 
+  /// navigates to level screen
   void navigateToLevel(BuildContext context) {
     Navigator.push(context,
         MaterialPageRoute(builder: (BuildContext context) => Level(simfile)));
   }
 
+  /// opens ESenseConnectDialog
   void openESenseConnectDialog(context) {
     showDialog(
       context: context,
@@ -38,6 +40,7 @@ class LevelListEntry extends StatelessWidget {
     );
   }
 
+  /// when clocked on the level, warn if not connected to ESense
   void tapHandler(BuildContext context) {
     if (ESenseInput.instance.connected) {
       navigateToLevel(context);