import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:spotiflac_android/l10n/l10n.dart';
import 'package:spotiflac_android/l10n/supported_locales.dart';
import 'package:spotiflac_android/providers/settings_provider.dart';
import 'package:spotiflac_android/providers/theme_provider.dart';
import 'package:spotiflac_android/utils/app_bar_layout.dart';
import 'package:spotiflac_android/widgets/settings_group.dart';

class AppearanceSettingsPage extends ConsumerWidget {
  const AppearanceSettingsPage({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final themeSettings = ref.watch(themeProvider);
    final settings = ref.watch(settingsProvider);
    final colorScheme = Theme.of(context).colorScheme;
    final topPadding = normalizedHeaderTopPadding(context);

    return PopScope(
      canPop: true,
      child: Scaffold(
        body: CustomScrollView(
          slivers: [
            SliverAppBar(
              expandedHeight: 120 + topPadding,
              collapsedHeight: kToolbarHeight,
              floating: false,
              pinned: true,
              backgroundColor: colorScheme.surface,
              surfaceTintColor: Colors.transparent,
              leading: IconButton(
                tooltip: MaterialLocalizations.of(context).backButtonTooltip,
                icon: const Icon(Icons.arrow_back),
                onPressed: () => Navigator.pop(context),
              ),
              flexibleSpace: _AppBarTitle(
                title: context.l10n.appearanceTitle,
                topPadding: topPadding,
              ),
            ),

            SliverToBoxAdapter(
              child: Padding(
                padding: const EdgeInsets.symmetric(
                  horizontal: 16,
                  vertical: 8,
                ),
                child: _ThemePreviewCard(),
              ),
            ),

            SliverToBoxAdapter(
              child: SettingsSectionHeader(title: context.l10n.sectionColor),
            ),

            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
                  SettingsSwitchItem(
                    icon: Icons.wallpaper,
                    title: context.l10n.appearanceDynamicColor,
                    subtitle: context.l10n.appearanceDynamicColorSubtitle,
                    value: themeSettings.useDynamicColor,
                    onChanged: (value) => ref
                        .read(themeProvider.notifier)
                        .setUseDynamicColor(value),
                    showDivider: false,
                  ),
                ],
              ),
            ),
            if (!themeSettings.useDynamicColor)
              SliverToBoxAdapter(
                child: Padding(
                  padding: const EdgeInsets.fromLTRB(16, 12, 16, 0),
                  child: _ColorPalettePicker(
                    currentColor: themeSettings.seedColorValue,
                    onColorSelected: (color) =>
                        ref.read(themeProvider.notifier).setSeedColor(color),
                  ),
                ),
              ),

            SliverToBoxAdapter(
              child: SettingsSectionHeader(title: context.l10n.sectionTheme),
            ),
            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
                  _ThemeModeSelector(
                    currentMode: themeSettings.themeMode,
                    onChanged: (mode) =>
                        ref.read(themeProvider.notifier).setThemeMode(mode),
                  ),
                  if (Theme.of(context).brightness == Brightness.dark)
                    SettingsSwitchItem(
                      icon: Icons.brightness_2,
                      title: context.l10n.appearanceAmoledDark,
                      subtitle: context.l10n.appearanceAmoledDarkSubtitle,
                      value: themeSettings.useAmoled,
                      onChanged: (value) =>
                          ref.read(themeProvider.notifier).setUseAmoled(value),
                      showDivider: false,
                    ),
                ],
              ),
            ),

            SliverToBoxAdapter(
              child: SettingsSectionHeader(title: context.l10n.sectionLanguage),
            ),
            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
                  _LanguageSelector(
                    currentLocale: settings.locale,
                    onChanged: (locale) =>
                        ref.read(settingsProvider.notifier).setLocale(locale),
                  ),
                ],
              ),
            ),

            SliverToBoxAdapter(
              child: SettingsSectionHeader(title: context.l10n.sectionLayout),
            ),
            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
                  _HistoryViewSelector(
                    currentMode: settings.historyViewMode,
                    onChanged: (mode) => ref
                        .read(settingsProvider.notifier)
                        .setHistoryViewMode(mode),
                  ),
                ],
              ),
            ),

            const SliverFillRemaining(
              hasScrollBody: false,
              child: SizedBox(height: 32),
            ),
          ],
        ),
      ),
    );
  }
}

class _ThemePreviewCard extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;

    return RepaintBoundary(
      child: LayoutBuilder(
        builder: (context, constraints) {
          final cardWidth = constraints.maxWidth;
          final previewHeight = (cardWidth * 0.56).clamp(170.0, 220.0);
          final innerWidth = (cardWidth - 48).clamp(220.0, 320.0);
          final innerHeight = (previewHeight * 0.70).clamp(120.0, 160.0);
          final innerPadding = (innerHeight * 0.11).clamp(12.0, 18.0);
          final artworkSize = (innerHeight - (innerPadding * 2)).clamp(
            80.0,
            120.0,
          );

          return Container(
            constraints: BoxConstraints(minHeight: previewHeight),
            width: double.infinity,
            decoration: BoxDecoration(
              color: colorScheme.surfaceContainerHighest,
              borderRadius: BorderRadius.circular(28),
            ),
            clipBehavior: Clip.antiAlias,
            child: Stack(
              children: [
                Positioned(
                  top: -(previewHeight * 0.25),
                  right: -(previewHeight * 0.25),
                  child: Container(
                    width: previewHeight,
                    height: previewHeight,
                    decoration: BoxDecoration(
                      shape: BoxShape.circle,
                      color: colorScheme.primaryContainer.withValues(
                        alpha: 0.5,
                      ),
                    ),
                  ),
                ),
                Positioned(
                  bottom: -(previewHeight * 0.15),
                  left: -(previewHeight * 0.15),
                  child: Container(
                    width: previewHeight * 0.75,
                    height: previewHeight * 0.75,
                    decoration: BoxDecoration(
                      shape: BoxShape.circle,
                      color: colorScheme.tertiaryContainer.withValues(
                        alpha: 0.5,
                      ),
                    ),
                  ),
                ),
                Center(
                  child: Container(
                    width: innerWidth,
                    height: innerHeight,
                    padding: EdgeInsets.all(innerPadding),
                    decoration: BoxDecoration(
                      color: colorScheme.surface,
                      borderRadius: BorderRadius.circular(20),
                      boxShadow: [
                        BoxShadow(
                          color: Colors.black.withValues(alpha: 0.1),
                          blurRadius: 12,
                          offset: const Offset(0, 8),
                        ),
                      ],
                    ),
                    child: Row(
                      children: [
                        Container(
                          width: artworkSize,
                          height: artworkSize,
                          decoration: BoxDecoration(
                            color: colorScheme.primary,
                            borderRadius: BorderRadius.circular(16),
                          ),
                          child: Icon(
                            Icons.music_note,
                            color: colorScheme.onPrimary,
                            size: artworkSize * 0.44,
                          ),
                        ),
                        const SizedBox(width: 16),
                        Expanded(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              Container(
                                width: double.infinity,
                                height: 14,
                                decoration: BoxDecoration(
                                  color: colorScheme.onSurface,
                                  borderRadius: BorderRadius.circular(4),
                                ),
                              ),
                              const SizedBox(height: 8),
                              Container(
                                width: 80,
                                height: 10,
                                decoration: BoxDecoration(
                                  color: colorScheme.primary,
                                  borderRadius: BorderRadius.circular(4),
                                ),
                              ),
                              const SizedBox(height: 24),
                              Row(
                                children: [
                                  Icon(
                                    Icons.skip_previous,
                                    size: 24,
                                    color: colorScheme.onSurfaceVariant,
                                  ),
                                  const SizedBox(width: 12),
                                  Icon(
                                    Icons.play_circle_fill,
                                    size: 32,
                                    color: colorScheme.primary,
                                  ),
                                  const SizedBox(width: 12),
                                  Icon(
                                    Icons.skip_next,
                                    size: 24,
                                    color: colorScheme.onSurfaceVariant,
                                  ),
                                ],
                              ),
                            ],
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
                Positioned(
                  bottom: 12,
                  right: 12,
                  child: Container(
                    padding: const EdgeInsets.symmetric(
                      horizontal: 10,
                      vertical: 4,
                    ),
                    decoration: BoxDecoration(
                      color: Colors.black.withValues(alpha: 0.6),
                      borderRadius: BorderRadius.circular(20),
                    ),
                    child: Text(
                      isDark
                          ? context.l10n.appearanceThemeDark
                          : context.l10n.appearanceThemeLight,
                      style: const TextStyle(
                        color: Colors.white,
                        fontSize: 10,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                ),
              ],
            ),
          );
        },
      ),
    );
  }
}

class _ColorPalettePicker extends StatelessWidget {
  final int currentColor;
  final ValueChanged<Color> onColorSelected;
  const _ColorPalettePicker({
    required this.currentColor,
    required this.onColorSelected,
  });

  static const _colors = [
    Color(0xFF1DB954),
    Color(0xFF6750A4),
    Color(0xFF0061A4),
    Color(0xFF006E1C),
    Color(0xFFBA1A1A),
    Color(0xFF984061),
    Color(0xFF7D5260),
    Color(0xFF006874),
  ];

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      child: Row(
        children: _colors.map((color) {
          final isSelected = color.toARGB32() == currentColor;
          final colorHex = color
              .toARGB32()
              .toRadixString(16)
              .padLeft(8, '0')
              .toUpperCase();
          return Padding(
            padding: const EdgeInsets.only(right: 12),
            child: Semantics(
              button: true,
              selected: isSelected,
              label: context.l10n.appearanceSelectAccentColor(colorHex),
              child: GestureDetector(
                onTap: () => onColorSelected(color),
                child: _ColorPaletteItem(color: color, isSelected: isSelected),
              ),
            ),
          );
        }).toList(),
      ),
    );
  }
}

class _ColorPaletteItem extends StatelessWidget {
  final Color color;
  final bool isSelected;

  const _ColorPaletteItem({required this.color, required this.isSelected});

  @override
  Widget build(BuildContext context) {
    final scheme = ColorScheme.fromSeed(
      seedColor: color,
      brightness: Theme.of(context).brightness,
    );
    final size = 64.0;

    return Stack(
      children: [
        Container(
          width: size,
          height: size,
          decoration: BoxDecoration(borderRadius: BorderRadius.circular(20)),
          clipBehavior: Clip.antiAlias,
          child: Column(
            children: [
              Expanded(
                child: Row(
                  children: [
                    Expanded(child: Container(color: scheme.primaryContainer)),
                    Expanded(child: Container(color: scheme.tertiaryContainer)),
                  ],
                ),
              ),
              Expanded(
                child: Row(
                  children: [
                    Expanded(
                      child: Container(color: scheme.secondaryContainer),
                    ),
                    Expanded(child: Container(color: scheme.surfaceContainer)),
                  ],
                ),
              ),
            ],
          ),
        ),
        if (isSelected)
          Positioned.fill(
            child: Center(
              child: Container(
                padding: const EdgeInsets.all(4),
                decoration: const BoxDecoration(
                  color: Colors.white,
                  shape: BoxShape.circle,
                ),
                child: Icon(Icons.check, size: 16, color: scheme.primary),
              ),
            ),
          ),
      ],
    );
  }
}

class _AppBarTitle extends StatelessWidget {
  final String title;
  final double topPadding;

  const _AppBarTitle({required this.title, required this.topPadding});

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    return LayoutBuilder(
      builder: (context, constraints) {
        final maxHeight = 120 + topPadding;
        final minHeight = kToolbarHeight + topPadding;
        final expandRatio =
            ((constraints.maxHeight - minHeight) / (maxHeight - minHeight))
                .clamp(0.0, 1.0);
        final leftPadding = 56 - (32 * expandRatio);
        return FlexibleSpaceBar(
          expandedTitleScale: 1.0,
          titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
          title: Text(
            title,
            style: TextStyle(
              fontSize: 20 + (8 * expandRatio),
              fontWeight: FontWeight.bold,
              color: colorScheme.onSurface,
            ),
          ),
        );
      },
    );
  }
}

class _ThemeModeSelector extends StatelessWidget {
  final ThemeMode currentMode;
  final ValueChanged<ThemeMode> onChanged;
  const _ThemeModeSelector({
    required this.currentMode,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(12),
      child: Row(
        children: [
          _ThemeModeChip(
            icon: Icons.brightness_auto,
            label: context.l10n.appearanceThemeSystem,
            isSelected: currentMode == ThemeMode.system,
            onTap: () => onChanged(ThemeMode.system),
          ),
          const SizedBox(width: 8),
          _ThemeModeChip(
            icon: Icons.light_mode,
            label: context.l10n.appearanceThemeLight,
            isSelected: currentMode == ThemeMode.light,
            onTap: () => onChanged(ThemeMode.light),
          ),
          const SizedBox(width: 8),
          _ThemeModeChip(
            icon: Icons.dark_mode,
            label: context.l10n.appearanceThemeDark,
            isSelected: currentMode == ThemeMode.dark,
            onTap: () => onChanged(ThemeMode.dark),
          ),
        ],
      ),
    );
  }
}

class _ThemeModeChip extends StatelessWidget {
  final IconData icon;
  final String label;
  final bool isSelected;
  final VoidCallback onTap;
  const _ThemeModeChip({
    required this.icon,
    required this.label,
    required this.isSelected,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;

    final unselectedColor = isDark
        ? Color.alphaBlend(
            Colors.white.withValues(alpha: 0.05),
            colorScheme.surface,
          )
        : Color.alphaBlend(
            Colors.black.withValues(alpha: 0.05),
            colorScheme.surfaceContainerHighest,
          );

    return Expanded(
      child: Container(
        decoration: BoxDecoration(
          color: isSelected ? colorScheme.primaryContainer : unselectedColor,
          borderRadius: BorderRadius.circular(12),
          border: !isDark && !isSelected
              ? Border.all(
                  color: colorScheme.outlineVariant.withValues(alpha: 0.5),
                  width: 1,
                )
              : null,
        ),
        child: Material(
          color: Colors.transparent,
          borderRadius: BorderRadius.circular(12),
          child: InkWell(
            onTap: onTap,
            borderRadius: BorderRadius.circular(12),
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 14),
              child: Column(
                children: [
                  Icon(
                    icon,
                    color: isSelected
                        ? colorScheme.onPrimaryContainer
                        : colorScheme.onSurfaceVariant,
                  ),
                  const SizedBox(height: 6),
                  Text(
                    label,
                    style: TextStyle(
                      fontSize: 12,
                      fontWeight: isSelected
                          ? FontWeight.w600
                          : FontWeight.normal,
                      color: isSelected
                          ? colorScheme.onPrimaryContainer
                          : colorScheme.onSurfaceVariant,
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class _HistoryViewSelector extends StatelessWidget {
  final String currentMode;
  final ValueChanged<String> onChanged;
  const _HistoryViewSelector({
    required this.currentMode,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    return Padding(
      padding: const EdgeInsets.all(12),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(left: 8, bottom: 8),
            child: Text(
              context.l10n.appearanceHistoryView,
              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                color: colorScheme.onSurfaceVariant,
              ),
            ),
          ),
          Row(
            children: [
              _ViewModeChip(
                icon: Icons.view_list,
                label: context.l10n.appearanceHistoryViewList,
                isSelected: currentMode == 'list',
                onTap: () => onChanged('list'),
              ),
              const SizedBox(width: 8),
              _ViewModeChip(
                icon: Icons.grid_view,
                label: context.l10n.appearanceHistoryViewGrid,
                isSelected: currentMode == 'grid',
                onTap: () => onChanged('grid'),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

class _ViewModeChip extends StatelessWidget {
  final IconData icon;
  final String label;
  final bool isSelected;
  final VoidCallback onTap;
  const _ViewModeChip({
    required this.icon,
    required this.label,
    required this.isSelected,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;

    final unselectedColor = isDark
        ? Color.alphaBlend(
            Colors.white.withValues(alpha: 0.05),
            colorScheme.surface,
          )
        : Color.alphaBlend(
            Colors.black.withValues(alpha: 0.05),
            colorScheme.surfaceContainerHighest,
          );

    return Expanded(
      child: Container(
        decoration: BoxDecoration(
          color: isSelected ? colorScheme.primaryContainer : unselectedColor,
          borderRadius: BorderRadius.circular(12),
          border: !isDark && !isSelected
              ? Border.all(
                  color: colorScheme.outlineVariant.withValues(alpha: 0.5),
                  width: 1,
                )
              : null,
        ),
        child: Material(
          color: Colors.transparent,
          borderRadius: BorderRadius.circular(12),
          child: InkWell(
            onTap: onTap,
            borderRadius: BorderRadius.circular(12),
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 14),
              child: Column(
                children: [
                  Icon(
                    icon,
                    color: isSelected
                        ? colorScheme.onPrimaryContainer
                        : colorScheme.onSurfaceVariant,
                  ),
                  const SizedBox(height: 6),
                  Text(
                    label,
                    style: TextStyle(
                      fontSize: 12,
                      fontWeight: isSelected
                          ? FontWeight.w600
                          : FontWeight.normal,
                      color: isSelected
                          ? colorScheme.onPrimaryContainer
                          : colorScheme.onSurfaceVariant,
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class _LanguageSelector extends StatelessWidget {
  final String currentLocale;
  final ValueChanged<String> onChanged;
  const _LanguageSelector({
    required this.currentLocale,
    required this.onChanged,
  });

  static const _allLanguages = [
    ('system', 'System Default', Icons.phone_android),
    ('en', 'English', Icons.language),
    ('id', 'Bahasa Indonesia', Icons.language),
    ('de', 'Deutsch', Icons.language),
    ('es', 'Español', Icons.language),
    ('es_ES', 'Español (España)', Icons.language),
    ('fr', 'Français', Icons.language),
    ('hi', 'हिन्दी', Icons.language),
    ('ja', '日本語', Icons.language),
    ('ko', '한국어', Icons.language),
    ('nl', 'Nederlands', Icons.language),
    ('pt', 'Português', Icons.language),
    ('pt_PT', 'Português (Brasil)', Icons.language),
    ('ru', 'Русский', Icons.language),
    ('tr', 'Türkçe', Icons.language),
    ('uk', 'Українська', Icons.language),
    ('zh', '简体中文', Icons.language),
    ('zh_CN', '简体中文 (中国)', Icons.language),
    ('zh_TW', '繁體中文', Icons.language),
  ];

  /// Uses filteredLocaleCodes from supported_locales.dart (generated file).
  List<(String, String, IconData)> get _languages {
    return _allLanguages.where((lang) {
      if (lang.$1 == 'system') return true;
      return filteredLocaleCodes.contains(lang.$1);
    }).toList();
  }

  String _getLanguageName(String code) {
    for (final lang in _allLanguages) {
      if (lang.$1 == code) return lang.$2;
    }
    return code;
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    return ListTile(
      leading: Icon(Icons.language, color: colorScheme.onSurfaceVariant),
      title: Text(context.l10n.appearanceLanguage),
      subtitle: Text(_getLanguageName(currentLocale)),
      trailing: Icon(Icons.chevron_right, color: colorScheme.onSurfaceVariant),
      onTap: () => _showLanguagePicker(context),
    );
  }

  void _showLanguagePicker(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    showModalBottomSheet<void>(
      context: context,
      useRootNavigator: true,
      backgroundColor: colorScheme.surface,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
      ),
      builder: (context) => SafeArea(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Padding(
              padding: const EdgeInsets.all(16),
              child: Text(
                context.l10n.appearanceLanguage,
                style: Theme.of(
                  context,
                ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
              ),
            ),
            const Divider(height: 1),
            Flexible(
              child: ListView.builder(
                shrinkWrap: true,
                itemCount: _languages.length,
                itemBuilder: (context, index) {
                  final lang = _languages[index];
                  final isSelected = currentLocale == lang.$1;
                  return ListTile(
                    leading: Icon(
                      lang.$3,
                      color: isSelected
                          ? colorScheme.primary
                          : colorScheme.onSurfaceVariant,
                    ),
                    title: Text(
                      lang.$2,
                      style: TextStyle(
                        color: isSelected
                            ? colorScheme.primary
                            : colorScheme.onSurface,
                        fontWeight: isSelected
                            ? FontWeight.w600
                            : FontWeight.normal,
                      ),
                    ),
                    trailing: isSelected
                        ? Icon(Icons.check, color: colorScheme.primary)
                        : null,
                    onTap: () {
                      onChanged(lang.$1);
                      Navigator.pop(context);
                    },
                  );
                },
              ),
            ),
            const SizedBox(height: 8),
          ],
        ),
      ),
    );
  }
}