car-interface-android/lib/features/home/widgets/clock_block.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

import '../../../core/theme/app_colors.dart';

/// Large, quiet clock. It sleeps until the next minute instead of ticking
/// every second.
class ClockBlock extends StatefulWidget {
  const ClockBlock({
    super.key,
    required this.compact,
    this.temperatureText,
    this.temperatureAlert = false,
  });

  final bool compact;
  final String? temperatureText;
  final bool temperatureAlert;

  @override
  State<ClockBlock> createState() => _ClockBlockState();
}

class _ClockBlockState extends State<ClockBlock> {
  late DateTime _now = DateTime.now();
  Timer? _timer;

  @override
  void initState() {
    super.initState();
    _scheduleTick();
  }

  void _scheduleTick() {
    _timer?.cancel();
    final now = DateTime.now();
    final next = DateTime(
      now.year,
      now.month,
      now.day,
      now.hour,
      now.minute,
    ).add(const Duration(minutes: 1));
    _timer = Timer(next.difference(now) + const Duration(milliseconds: 80), () {
      if (!mounted) return;
      setState(() => _now = DateTime.now());
      _scheduleTick();
    });
  }

  @override
  void dispose() {
    _timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final colors = context.colors;
    final locale = Localizations.localeOf(context).toLanguageTag();
    final use24Hour = MediaQuery.alwaysUse24HourFormatOf(context);
    final time = (use24Hour ? DateFormat.Hm(locale) : DateFormat.jm(locale))
        .format(_now);
    final date = DateFormat('EEEE, d MMMM', locale).format(_now);

    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          time,
          maxLines: 1,
          style: theme.textTheme.displayLarge?.copyWith(
            fontSize: widget.compact ? 56 : 72,
            fontFeatures: const [FontFeature.tabularFigures()],
            height: 0.95,
          ),
        ),
        const SizedBox(height: 10),
        Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 6,
              height: 6,
              decoration: BoxDecoration(
                color: colors.accent,
                shape: BoxShape.circle,
              ),
            ),
            const SizedBox(width: 10),
            Text(
              date,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: theme.textTheme.titleMedium?.copyWith(
                color: colors.inkMuted,
                fontWeight: FontWeight.w500,
                fontSize: widget.compact ? 14 : 16,
              ),
            ),
          ],
        ),
        if (widget.temperatureText != null) ...[
          const SizedBox(height: 7),
          AnimatedSwitcher(
            duration: const Duration(milliseconds: 220),
            child: Text(
              widget.temperatureText!,
              key: ValueKey(widget.temperatureText),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: theme.textTheme.titleSmall?.copyWith(
                color: widget.temperatureAlert ? colors.danger : colors.ink,
                fontWeight: FontWeight.w600,
                fontSize: widget.compact ? 13 : 14,
              ),
            ),
          ),
        ],
      ],
    );
  }
}