lib (All flutter code in present here)
 ┃
 ┣ constants (Various constant values used throughout the app)
 ┃
 ┣ controllers (All the controllers/notifiers used in the app)
 ┃
 ┣ pages (All the UI pages in the app)
 ┃
 ┣ painters (All the custom painters used in the app)
 ┃
 ┣ router (All the routes used in the app)
 ┃
 ┣ services (All the services used in the app)
 ┃
 ┣ utils (All reusable code (functions, classes, etc.) used in the app)
 ┃
 ┗ widgets (All the widgets used in the app)

lib
 ┃
 ┣ constants
 ┃ ┣ app_color.dart (App color constants)
 ┃ ┗ app_data.dart (App data constants such as device size)
 ┃
 ┣ controllers
 ┃ ┣ audio_player_controller.dart (Audio player controller)
 ┃ ┣ path_controller.dart (Path controller)
 ┃ ┣ record_controller.dart (Recording controller)
 ┃ ┣ settings_controller.dart (Settings controller)
 ┃ ┣ theme_controller.dart (Theme controller)
 ┃ ┣ timer_controller.dart (Timer controller to check recording duration)
 ┃ ┗ waveform_controller.dart (Waveform controller, to plot amplitude waveform)
 ┃
 ┣ pages
 ┃ ┣ home_page.dart (The default home page, which consists of app bar and body)
 ┃ ┣ loading_page.dart (A loading page is shown for data loading)
 ┃ ┗ record_page.dart (The main body of the app, which consists of recording, playback, and settings)
 ┃
 ┣ painters
 ┃ ┣ audio_waveform_painter.dart (Painter to draw the waveform, not in use)
 ┃ ┣ ripple_painter.dart (Painter to draw the ripple effect behind record button)
 ┃ ┗ wave_painter.dart (Painter to draw the waveform of the amplitude + animations)
 ┃
 ┣ router
 ┃ ┣ app_router.dart (Define routes inside the app)
 ┃ ┣ app_router.gr.dart (Generated file)
 ┃ ┣ route_observer.dart (Define route observer to get current route stack, and debug)
 ┃ ┗ transition_route_builders.dart (Animations which happen on route transition)
 ┃
 ┣ services
 ┃ ┣ locator.dart (Service locator, using get_it package to register notifiers and services)
 ┃ ┣ logger.dart (Logger service, which logs errors, infos or any warnings)
 ┃ ┣ product_service.dart (Product service, which handles all product related operations like fetching them)
 ┃ ┣ theme_pref_service.dart (Theme preference service, which handles the theme preference, and change theme)
 ┃ ┣ theme_service.dart (Theme service, which handles the theme, and change theme)
 ┃ ┗ transaction_service.dart (Transaction service, which handles all stock record related operations like fetching, updating them)
 ┃ ┣ audio_player_service.dart
 ┃ ┣ locator_service.dart (Service locator, using get_it package to register notifiers and services)
 ┃ ┣ logger_service.dart (Logger service, which logs errors, infos or any warnings)
 ┃ ┣ path_service.dart (Path service, which handles all path related operations like fetching docs, etc.)
 ┃ ┣ record_service.dart (Recording service, which handles all recording related operations)
 ┃ ┣ settings_service.dart (Settings service, which handles all settings, currently handles only graph style)
 ┃ ┣ snackbar_service.dart (Snackbar service, which handles all snackbars)
 ┃ ┣ theme_pref_service.dart (Theme preference service, which handles the theme preference, and change theme)
 ┃ ┣ theme_service.dart (Theme service, which handles the theme, and change theme)
 ┃ ┣ timer_service.dart (Timer service, which handles all timers which are used for recording duration, amplitude waveform, etc.)
 ┃ ┗ waveform_service.dart (Waveform service, which handles all waveform related operations, currently not in use)
 ┃
 ┣ utils
 ┃ ┗ smoothing.dart (A filter to smooth out the amplitude waveform matrix)
 ┃
 ┣ widgets
 ┃ ┣ amplitude_widget.dart (Widget to draw the amplitude waveform)
 ┃ ┣ audio_waveform_widget.dart (Widget to draw the waveform, not in use)
 ┃ ┣ bug_report_button.dart (Button to send bug reports)
 ┃ ┣ directory_button.dart (Widget to display the directory button)
 ┃ ┣ directory_sheet.dart (Widget to display the directory sheet)
 ┃ ┣ format_settings.dart (Widget to display the format settings)
 ┃ ┣ last_recording_bubble.dart (Widget to display the last recording bubble)
 ┃ ┣ pause_button.dart (Widget to display the pause button)
 ┃ ┣ realistic_graph_button.dart (Widget to display the realistic graph button)
 ┃ ┣ recording_card.dart (Widget to display the recording card in directory sheet)
 ┃ ┣ record_button.dart (Widget to display the record button)
 ┃ ┣ record_duration.dart (Widget to display the recording duration)
 ┃ ┗ scrollable_bottom_sheet.dart (Widget to display the bottom sheet i.e. used in directory sheet)
 ┃
 ┣ generated_plugin_registrant.dart (Generated file for plugins)
 ┗ main.dart (Main file, which is the entry point of the app, used for registering theme, providers, routes, etc.)