Flight Booking

import 'package:flutter/material.dart';

class FlightBooking extends StatefulWidget {
  const FlightBooking({super.key});

  @override
  State<FlightBooking> createState() => _FlightBookingState();
}

class _FlightBookingState extends State<FlightBooking> {
  var _tripType = 'Round trip';
  var _passengers = 1;
  var _cabin = 'Economy';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Flight Booking')),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          SegmentedButton<String>(
            segments: const [
              ButtonSegment(value: 'Round trip', label: Text('Round trip')),
              ButtonSegment(value: 'One way', label: Text('One way')),
              ButtonSegment(value: 'Multi-city', label: Text('Multi-city')),
            ],
            selected: {_tripType},
            onSelectionChanged: (s) => setState(() => _tripType = s.first),
          ),
          const SizedBox(height: 20),
          TextField(
            decoration: InputDecoration(
              labelText: 'From',
              hintText: 'Origin city',
              prefixIcon: const Icon(Icons.flight_takeoff),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(12),
              ),
            ),
          ),
          const SizedBox(height: 12),
          TextField(
            decoration: InputDecoration(
              labelText: 'To',
              hintText: 'Destination city',
              prefixIcon: const Icon(Icons.flight_land),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(12),
              ),
            ),
          ),
          const SizedBox(height: 12),
          Row(
            children: [
              Expanded(
                child: TextField(
                  decoration: InputDecoration(
                    labelText: 'Depart',
                    prefixIcon: const Icon(Icons.calendar_today),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                  ),
                ),
              ),
              if (_tripType == 'Round trip') ...[
                const SizedBox(width: 12),
                Expanded(
                  child: TextField(
                    decoration: InputDecoration(
                      labelText: 'Return',
                      prefixIcon: const Icon(Icons.calendar_today),
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                    ),
                  ),
                ),
              ],
            ],
          ),
          const SizedBox(height: 12),
          Row(
            children: [
              Expanded(
                child: DropdownButtonFormField<int>(
                  initialValue: _passengers,
                  decoration: InputDecoration(
                    labelText: 'Passengers',
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                  ),
                  items: [1, 2, 3, 4, 5]
                      .map((n) => DropdownMenuItem(value: n, child: Text('$n')))
                      .toList(),
                  onChanged: (v) => setState(() => _passengers = v ?? 1),
                ),
              ),
              const SizedBox(width: 12),
              Expanded(
                child: DropdownButtonFormField<String>(
                  initialValue: _cabin,
                  decoration: InputDecoration(
                    labelText: 'Class',
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                  ),
                  items: ['Economy', 'Premium', 'Business', 'First']
                      .map((c) => DropdownMenuItem(value: c, child: Text(c)))
                      .toList(),
                  onChanged: (v) => setState(() => _cabin = v ?? _cabin),
                ),
              ),
            ],
          ),
          const SizedBox(height: 24),
          FilledButton(
            onPressed: () => _showDemo(context, 'Search Flights (demo)'),
            style: FilledButton.styleFrom(
              padding: const EdgeInsets.symmetric(vertical: 16),
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(12),
              ),
            ),
            child: const Text('Search Flights'),
          ),
        ],
      ),
    );
  }
}

void _showDemo(BuildContext context, String message) {
  ScaffoldMessenger.of(context)
    ..hideCurrentSnackBar()
    ..showSnackBar(SnackBar(content: Text(message)));
}