import 'dart:async';

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

import '../../../core/theme/app_colors.dart';
import '../../../core/widgets/app_icon.dart';
import '../../../core/widgets/pressable.dart';
import '../../home/gps_speed_controller.dart';
import '../../home/obd_controller.dart';
import '../../home/telemetry_settings_controller.dart';
import '../../home/weather_controller.dart';

/// Time, speed, temperature and a Home shortcut for the Jellyfin pages.
class JellyfinStatusStrip extends StatefulWidget {
  const JellyfinStatusStrip({super.key});

  @override
  State<JellyfinStatusStrip> createState() => _JellyfinStatusStripState();
}

class _JellyfinStatusStripState extends State<JellyfinStatusStrip> {
  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 colors = context.colors;
    final theme = Theme.of(context);
    final telemetry = context.watch<TelemetrySettingsController>();
    final obd = context.watch<ObdController>();
    final gps = context.watch<GpsSpeedController>();
    final weather = context.watch<WeatherController>();

    final useObdSpeed =
        telemetry.speedEnabled && telemetry.speedUseObd && obd.hasTelemetry;
    final speed = !telemetry.speedEnabled
        ? null
        : useObdSpeed
        ? obd.speedKmh
        : gps.speedKmh;
    final useObdTemperature =
        telemetry.temperatureUseObd && obd.ambientCelsius != null;
    final temperature = !telemetry.temperatureEnabled
        ? null
        : useObdTemperature
        ? obd.ambientCelsius
        : (weather.hasTemperature ? weather.temperatureCelsius : null);

    final locale = Localizations.localeOf(context).toLanguageTag();
    final use24Hour = MediaQuery.alwaysUse24HourFormatOf(context);
    final time = (use24Hour ? DateFormat.Hm(locale) : DateFormat.jm(locale))
        .format(_now);

    return Container(
      key: const ValueKey('jellyfin-status-strip'),
      padding: const EdgeInsets.fromLTRB(16, 8, 8, 8),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Text(
            time,
            style: theme.textTheme.labelLarge?.copyWith(
              color: colors.ink,
              fontSize: 16,
              fontFeatures: const [FontFeature.tabularFigures()],
            ),
          ),
          const SizedBox(width: 14),
          _StripMetric(
            iconAsset: 'assets/icons/gauge.svg',
            text: speed == null ? '-- km/h' : '${speed.round()} km/h',
            available: speed != null,
          ),
          const SizedBox(width: 14),
          _StripMetric(
            iconAsset: 'assets/icons/thermometer.svg',
            text: temperature == null ? '--°C' : '${temperature.round()}°C',
            available: temperature != null,
          ),
          const SizedBox(width: 10),
          Pressable(
            onTap: () =>
                Navigator.of(context).popUntil((route) => route.isFirst),
            semanticLabel: 'Go to home',
            pressedScale: 0.92,
            child: Container(
              width: 42,
              height: 42,
              decoration: BoxDecoration(
                color: colors.surfaceStrong,
                shape: BoxShape.circle,
                border: Border.all(color: colors.border),
              ),
              alignment: Alignment.center,
              child: AppIcon(
                'assets/icons/home.svg',
                size: 21,
                color: colors.ink,
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _StripMetric extends StatelessWidget {
  const _StripMetric({
    required this.iconAsset,
    required this.text,
    required this.available,
  });

  final String iconAsset;
  final String text;
  final bool available;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        AppIcon(
          iconAsset,
          size: 18,
          color: available ? colors.inkMuted : colors.inkFaint,
        ),
        const SizedBox(width: 6),
        Text(
          text,
          style: theme.textTheme.labelLarge?.copyWith(
            color: available ? colors.ink : colors.inkFaint,
            fontFeatures: const [FontFeature.tabularFigures()],
          ),
        ),
      ],
    );
  }
}