umbrix/lib/main.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:umbrix/bootstrap.dart';
import 'package:umbrix/core/model/environment.dart';

void main() async {
  // Single instance check - BEFORE Flutter initialization
  if (Platform.isLinux || Platform.isWindows) {
    final lockFile = File('/tmp/umbrix.lock');
    
    if (await lockFile.exists()) {
      try {
        final pidString = await lockFile.readAsString();
        final pid = int.tryParse(pidString.trim());
        
        if (pid != null) {
          // Check if process is still alive
          final result = await Process.run('ps', ['-p', pid.toString()]);
          
          if (result.exitCode == 0) {
            // Process alive - restore and focus existing window
            try {
              // Find window and restore from minimized state, then activate
              final searchResult = await Process.run('xdotool', ['search', '--name', 'Umbrix']);
              if (searchResult.exitCode == 0 && searchResult.stdout.toString().trim().isNotEmpty) {
                final windowId = searchResult.stdout.toString().trim().split('\n').first;
                // Restore from minimized/iconified state
                await Process.run('xdotool', ['windowmap', windowId]);
                await Process.run('xdotool', ['windowactivate', windowId]);
              }
            } catch (_) {
              // xdotool not available, just exit
            }
            exit(0);
          } else {
            // Stale lock - remove it
            await lockFile.delete();
          }
        }
      } catch (e) {
        try { await lockFile.delete(); } catch (_) {}
      }
    }
    
    // Create lock file with current PID
    try {
      await lockFile.create();
      await lockFile.writeAsString(pid.toString());
    } catch (_) {}
  }

  final widgetsBinding = WidgetsFlutterBinding.ensureInitialized();

  SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      systemNavigationBarColor: Colors.transparent,
    ),
  );

  return lazyBootstrap(widgetsBinding, Environment.dev);
}