// SPDX-FileCopyrightText: 2026 FocusFlow contributors
// SPDX-License-Identifier: AGPL-3.0-only

/// Launches the FocusFlow Flutter desktop application.
library;

import 'package:flutter/material.dart';
import 'package:scheduler_core/scheduler_core.dart'
    as scheduler_core
    show logger;

import 'app/focus_flow_app.dart';
import 'app/persistent_scheduler_composition.dart';
import 'app/runtime/focus_flow_file_logger.dart';
import 'app/runtime/focus_flow_runtime_config.dart';

export 'app/demo_scheduler_composition.dart';
export 'app/focus_flow_app.dart';
export 'app/persistent_scheduler_composition.dart';

/// Starts the FocusFlow app with the persistent SQLite scheduler composition.
Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  var logger = FocusFlowFileLogger.disabled();
  try {
    final config = await FocusFlowRuntimeConfig.load();
    logger = await FocusFlowFileLogger.open(config);
    scheduler_core.logger.info(() => 'FocusFlow startup started.');
    scheduler_core.logger.debug(
      () => 'Runtime config loaded. fileLogging=${logger.isEnabled}',
    );
    final composition = await PersistentSchedulerComposition.open(
      logger: logger,
      uiTimeZone: config.timeZone,
    );
    scheduler_core.logger.info(() => 'FocusFlow startup completed.');
    runApp(FocusFlowApp(composition: composition));
  } on Object catch (error, stackTrace) {
    scheduler_core.logger.error(
      () => 'FocusFlow startup failed.',
      error: error,
      stackTrace: stackTrace,
    );
    runApp(_StartupFailureApp(message: error.toString()));
  }
}

/// Minimal failure app shown when persistent startup cannot finish.
class _StartupFailureApp extends StatelessWidget {
  /// Creates a startup failure app with [message].
  const _StartupFailureApp({required this.message});

  /// Diagnostic startup failure message.
  final String message;

  /// Builds the widget subtree for this component.
  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'FocusFlow',
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(24),
            child: Text('Unable to open local schedule data.\n$message'),
          ),
        ),
      ),
    );
  }
}