part of '../settings_page.dart';

/// System / Light / Dark, mirroring desktop's appearance-mode selector.
const _modeOptions = <({ThemeMode mode, IconData icon})>[
  (mode: ThemeMode.system, icon: LucideIcons.sunMoon),
  (mode: ThemeMode.light, icon: LucideIcons.sun),
  (mode: ThemeMode.dark, icon: LucideIcons.moon),
];

String _modeLabel(BuildContext context, ThemeMode mode) => switch (mode) {
  ThemeMode.system => context.l10n.modeSystem,
  ThemeMode.light => context.l10n.modeLight,
  ThemeMode.dark => context.l10n.modeDark,
};

class _AppearanceSection extends ConsumerWidget {
  const _AppearanceSection();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final preference = ref.watch(communityThemeProvider);
    final mode = preference.mode;
    final schemeName = preference.theme;
    final accentIndex = effectiveAccentIndex(
      preference.theme,
      preference.accent,
    );

    return AppListCard(
      label: context.l10n.appearanceStyle,
      children: [
        AppListRow(
          icon: LucideIcons.sunMoon,
          title: context.l10n.appearance,
          value: _modeLabel(context, mode),
          trailing: const _RowChevron(),
          onTap: () => _showAppearanceModeSheet(context),
        ),
        AppListRow(
          icon: LucideIcons.palette,
          title: context.l10n.theme,
          value: themeSelectionLabel(schemeName, mode),
          trailing: const _RowChevron(),
          onTap: () => Navigator.of(context).push(
            MaterialPageRoute<void>(builder: (_) => const ThemePickerPage()),
          ),
        ),
        if (!isBuzzTheme(effectiveTheme(schemeName, mode)?.name ?? schemeName))
          AppListRow(
            icon: LucideIcons.droplet,
            title: context.l10n.accentColor,
            // The swatch *is* the value — naming the color as well would say the
            // same thing twice, so it takes the chevron's place.
            trailing: _AccentSwatch(accentIndex: accentIndex),
            onTap: () => Navigator.of(context).push(
              MaterialPageRoute<void>(builder: (_) => const AccentPickerPage()),
            ),
          ),
        AppListRow(
          icon: LucideIcons.languages,
          title: context.l10n.language,
          value: _languageLabel(context, ref.watch(appLocaleProvider)),
          trailing: const _RowChevron(),
          onTap: () => _showLanguageSheet(context),
        ),
      ],
    );
  }
}

void _showAppearanceModeSheet(BuildContext context) {
  showBuzzModalBottomSheet<void>(
    context: context,
    showDragHandle: true,
    builder: (_) => const _AppearanceModeSheet(),
  );
}

/// Three choices is too few to warrant a page, so the appearance row opens a
/// sheet rather than pushing a route.
class _AppearanceModeSheet extends ConsumerWidget {
  const _AppearanceModeSheet();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final mode = ref.watch(communityThemeProvider).mode;

    return SafeArea(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(
              Grid.gutter,
              0,
              Grid.gutter,
              Grid.xxs,
            ),
            child: Text(
              context.l10n.appearance,
              style: context.textTheme.titleMedium,
            ),
          ),
          for (final option in _modeOptions)
            AppListRow(
              icon: option.icon,
              title: _modeLabel(context, option.mode),
              trailing: option.mode == mode
                  ? Icon(
                      LucideIcons.check,
                      size: 18,
                      color: context.colors.primary,
                    )
                  : null,
              onTap: () {
                ref.read(communityThemeProvider.notifier).setMode(option.mode);
                Navigator.of(context).pop();
              },
            ),
          const SizedBox(height: Grid.xxs),
        ],
      ),
    );
  }
}

String _languageLabel(BuildContext context, Locale? locale) {
  if (locale == null) return context.l10n.languageSystem;
  return locale.languageCode == 'zh'
      ? context.l10n.languageChinese
      : context.l10n.languageEnglish;
}

void _showLanguageSheet(BuildContext context) {
  showBuzzModalBottomSheet<void>(
    context: context,
    showDragHandle: true,
    builder: (_) => const _LanguageSheet(),
  );
}

class _LanguageSheet extends ConsumerWidget {
  const _LanguageSheet();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final selected = ref.watch(appLocaleProvider);
    final options = <({Locale? locale, String label})>[
      (locale: null, label: context.l10n.languageSystem),
      (locale: const Locale('zh', 'CN'), label: context.l10n.languageChinese),
      (locale: const Locale('en'), label: context.l10n.languageEnglish),
    ];
    return SafeArea(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(
              Grid.gutter,
              0,
              Grid.gutter,
              Grid.xxs,
            ),
            child: Text(
              context.l10n.language,
              style: context.textTheme.titleMedium,
            ),
          ),
          for (final option in options)
            AppListRow(
              icon: LucideIcons.languages,
              title: option.label,
              trailing: option.locale == selected
                  ? Icon(
                      LucideIcons.check,
                      size: 18,
                      color: context.colors.primary,
                    )
                  : null,
              onTap: () {
                ref.read(appLocaleProvider.notifier).setLocale(option.locale);
                Navigator.of(context).pop();
              },
            ),
          const SizedBox(height: Grid.xxs),
        ],
      ),
    );
  }
}

/// The selected accent, shown where a row would otherwise carry a chevron.
class _AccentSwatch extends StatelessWidget {
  const _AccentSwatch({required this.accentIndex});

  static const _size = 22.0;

  final int accentIndex;

  @override
  Widget build(BuildContext context) {
    return Container(
      width: _size,
      height: _size,
      decoration: BoxDecoration(
        color: accentColorForScheme(context.colors, accentIndex),
        shape: BoxShape.circle,
        border: Border.all(color: context.colors.outlineVariant),
      ),
    );
  }
}