import 'dart:async';

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

import '../../core/theme/app_colors.dart';
import '../../core/widgets/app_icon.dart';
import '../../data/models/jellyfin_library.dart';
import '../../data/services/jellyfin_library_service.dart';
import '../jellyfin/jellyfin_playback_controller.dart';
import 'jellyfin_controller.dart';
import 'jellyfin_genre_dialog.dart';
import 'settings_widgets.dart';

/// Settings card for the optional Jellyfin music server. Quick Connect is the
/// only sign-in path; the token itself never leaves secure storage.
class JellyfinSettingsCard extends StatefulWidget {
  const JellyfinSettingsCard({super.key, this.playback});

  final JellyfinPlaybackController? playback;

  @override
  State<JellyfinSettingsCard> createState() => _JellyfinSettingsCardState();
}

class _JellyfinSettingsCardState extends State<JellyfinSettingsCard>
    with WidgetsBindingObserver {
  late final TextEditingController _url;
  final FocusNode _urlFocus = FocusNode();

  @override
  void initState() {
    super.initState();
    _url = TextEditingController(
      text: context.read<JellyfinController>().serverUrl,
    );
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    _url.dispose();
    _urlFocus.dispose();
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state != AppLifecycleState.resumed || !mounted) return;
    context.read<JellyfinController>().onAppResumed();
  }

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final jellyfin = context.watch<JellyfinController>();

    if (!_urlFocus.hasFocus && _url.text != jellyfin.serverUrl) {
      _url.value = TextEditingValue(
        text: jellyfin.serverUrl,
        selection: TextSelection.collapsed(offset: jellyfin.serverUrl.length),
      );
    }

    final statusColor = _statusColor(jellyfin, colors);
    final connected = jellyfin.connected;
    final showUrl = jellyfin.enabled && !connected && !jellyfin.pairing;

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Container(
              width: 42,
              height: 42,
              decoration: BoxDecoration(
                color: colors.accentSoft,
                borderRadius: BorderRadius.circular(14),
              ),
              alignment: Alignment.center,
              child: AppIcon(
                'assets/icons/music.svg',
                size: 20,
                color: colors.accent,
              ),
            ),
            const SizedBox(width: 14),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('Jellyfin', style: theme.textTheme.titleMedium),
                  const SizedBox(height: 2),
                  Row(
                    children: [
                      Container(
                        width: 7,
                        height: 7,
                        decoration: BoxDecoration(
                          color: statusColor,
                          shape: BoxShape.circle,
                        ),
                      ),
                      const SizedBox(width: 7),
                      Expanded(
                        child: Text(
                          jellyfin.statusLabel,
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                          style: theme.textTheme.bodySmall?.copyWith(
                            color: colors.inkMuted,
                          ),
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
            const SizedBox(width: 8),
            SettingsSwitch(
              value: jellyfin.enabled,
              semanticsLabel: jellyfin.enabled
                  ? 'Turn off Jellyfin'
                  : 'Turn on Jellyfin',
              onChanged: (value) {
                unawaited(jellyfin.setEnabled(value));
              },
            ),
          ],
        ),
        if (jellyfin.enabled) ...[
          const SizedBox(height: 12),
          Divider(color: colors.border, height: 24),
          if (jellyfin.pairing)
            _QuickConnectCode(controller: jellyfin)
          else ...[
            if (showUrl) ...[
              Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Expanded(
                    child: TextField(
                      controller: _url,
                      focusNode: _urlFocus,
                      keyboardType: TextInputType.url,
                      textInputAction: TextInputAction.go,
                      autocorrect: false,
                      enabled: !jellyfin.busy,
                      style: theme.textTheme.bodyMedium,
                      onSubmitted: (value) {
                        _urlFocus.unfocus();
                        unawaited(jellyfin.connect(value));
                      },
                      decoration: const InputDecoration(
                        labelText: 'Server URL',
                        hintText: 'https://jellyfin.example.com',
                        isDense: true,
                      ),
                    ),
                  ),
                  const SizedBox(width: 10),
                  Padding(
                    padding: const EdgeInsets.only(top: 4),
                    child: TextButton(
                      onPressed: jellyfin.busy
                          ? null
                          : () {
                              _urlFocus.unfocus();
                              unawaited(jellyfin.connect(_url.text));
                            },
                      style: TextButton.styleFrom(
                        foregroundColor: colors.accent,
                      ),
                      child: Text(jellyfin.busy ? 'Connecting…' : 'Connect'),
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 8),
            ],
            if (connected) ...[
              Row(
                children: [
                  Expanded(
                    child: Text(
                      jellyfin.userName == null
                          ? 'Signed in.'
                          : 'Signed in as ${jellyfin.userName}.',
                      style: theme.textTheme.bodySmall?.copyWith(
                        color: colors.inkMuted,
                      ),
                    ),
                  ),
                  TextButton(
                    onPressed: () {
                      unawaited(jellyfin.removePairing());
                    },
                    style: TextButton.styleFrom(foregroundColor: colors.danger),
                    child: const Text('Remove pairing'),
                  ),
                ],
              ),
            ] else if (jellyfin.status == JellyfinStatus.offline) ...[
              Row(
                children: [
                  Expanded(
                    child: Text(
                      'Jellyfin is paused until the connection returns. '
                      'It will retry automatically.',
                      style: theme.textTheme.bodySmall?.copyWith(
                        color: colors.inkMuted,
                      ),
                    ),
                  ),
                  TextButton(
                    onPressed: () {
                      unawaited(jellyfin.checkNow());
                    },
                    style: TextButton.styleFrom(foregroundColor: colors.accent),
                    child: const Text('Retry now'),
                  ),
                ],
              ),
            ] else if (jellyfin.busy) ...[
              Text(
                'Checking the server…',
                style: theme.textTheme.bodySmall?.copyWith(
                  color: colors.inkMuted,
                ),
              ),
            ] else if (!jellyfin.needsRepair) ...[
              Text(
                jellyfin.hasSession
                    ? 'CarDash reuses the saved pairing. Connect to check it, '
                          'or enter a different server URL.'
                    : jellyfin.hasServerUrl
                    ? 'Press Connect to pair this server with a Quick Connect '
                          'code.'
                    : 'Enter the address of your Jellyfin server to pair it '
                          'with CarDash.',
                style: theme.textTheme.bodySmall?.copyWith(
                  color: colors.inkMuted,
                ),
              ),
            ],
          ],
          if (jellyfin.error != null) ...[
            const SizedBox(height: 8),
            Text(
              jellyfin.error!,
              style: theme.textTheme.bodySmall?.copyWith(color: colors.danger),
            ),
          ],
          const SizedBox(height: 4),
          Divider(color: colors.border, height: 24),
          _GenreRow(
            controller: jellyfin,
            onChoose: () => _openGenres(jellyfin),
          ),
          const SizedBox(height: 4),
          Divider(color: colors.border, height: 24),
          _AudioQualityRow(controller: jellyfin),
          if (jellyfin.configured && widget.playback != null) ...[
            const SizedBox(height: 4),
            Divider(color: colors.border, height: 24),
            _PlaybackNotificationRow(playback: widget.playback!),
          ],
        ] else if (jellyfin.needsRepair) ...[
          const SizedBox(height: 12),
          Text(
            '${jellyfin.error ?? 'The saved Jellyfin pairing is no longer valid.'} '
            'Pair again to keep using Jellyfin.',
            style: theme.textTheme.bodySmall?.copyWith(color: colors.danger),
          ),
          const SizedBox(height: 4),
          TextButton(
            onPressed: () {
              unawaited(jellyfin.pairAgain());
            },
            style: TextButton.styleFrom(
              foregroundColor: colors.accent,
              padding: EdgeInsets.zero,
              alignment: Alignment.centerLeft,
            ),
            child: const Text('Pair again'),
          ),
        ],
        const SizedBox(height: 8),
        Text(
          'CarDash reads your music library and reports playback so Jellyfin '
          'can track recently played. The access token is stored on this '
          'device and can be removed at any time.',
          style: theme.textTheme.bodySmall?.copyWith(color: colors.inkMuted),
        ),
      ],
    );
  }

  Future<void> _openGenres(JellyfinController jellyfin) async {
    final library = context.read<JellyfinLibraryService>();
    final result = await showJellyfinGenreDialog(
      context,
      library: library,
      selected: jellyfin.genreSelections,
    );
    if (result == null || !mounted) return;
    await jellyfin.setGenreSelections(result);
  }

  Color _statusColor(JellyfinController jellyfin, AppColors colors) {
    if (jellyfin.connected) return colors.accent;
    if (jellyfin.error != null ||
        jellyfin.status == JellyfinStatus.error ||
        jellyfin.needsRepair) {
      return colors.danger;
    }
    if (jellyfin.status == JellyfinStatus.offline) return colors.warning;
    return colors.inkFaint;
  }
}

class _PlaybackNotificationRow extends StatefulWidget {
  const _PlaybackNotificationRow({required this.playback});

  final JellyfinPlaybackController playback;

  @override
  State<_PlaybackNotificationRow> createState() =>
      _PlaybackNotificationRowState();
}

class _PlaybackNotificationRowState extends State<_PlaybackNotificationRow>
    with WidgetsBindingObserver {
  bool? _granted;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    unawaited(_check());
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      unawaited(_check());
    }
  }

  Future<void> _check() async {
    final granted = await widget.playback.notificationPermissionGranted();
    if (mounted) setState(() => _granted = granted);
  }

  Future<void> _request() async {
    final granted = await widget.playback.requestNotificationPermission();
    if (mounted) setState(() => _granted = granted);
  }

  @override
  Widget build(BuildContext context) {
    final granted = _granted;
    if (granted == null) return const SizedBox.shrink();
    final colors = context.colors;
    final theme = Theme.of(context);
    return Row(
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('Playback notifications', style: theme.textTheme.bodyLarge),
              const SizedBox(height: 2),
              Text(
                granted
                    ? 'Allowed. Android shows the media controls.'
                    : 'Hidden while Android notifications are off.',
                maxLines: 2,
                overflow: TextOverflow.ellipsis,
                style: theme.textTheme.bodySmall?.copyWith(
                  color: granted ? colors.inkMuted : colors.inkFaint,
                ),
              ),
            ],
          ),
        ),
        if (!granted)
          TextButton(
            onPressed: () => unawaited(_request()),
            style: TextButton.styleFrom(foregroundColor: colors.accent),
            child: const Text('Allow'),
          ),
      ],
    );
  }
}

class _AudioQualityRow extends StatelessWidget {
  const _AudioQualityRow({required this.controller});

  final JellyfinController controller;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final quality = controller.audioQuality;
    return Row(
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('Streaming quality', style: theme.textTheme.bodyLarge),
              const SizedBox(height: 2),
              Text(
                quality.isDirect
                    ? 'Direct plays the original file. Applies to the next album.'
                    : 'Transcodes to MP3 at ${quality.label}. '
                          'Applies to the next album.',
                style: theme.textTheme.bodySmall?.copyWith(
                  color: colors.inkMuted,
                ),
              ),
            ],
          ),
        ),
        const SizedBox(width: 8),
        DropdownButton<JellyfinAudioQuality>(
          value: quality,
          isDense: true,
          borderRadius: BorderRadius.circular(12),
          dropdownColor: colors.surface,
          underline: const SizedBox.shrink(),
          icon: Icon(
            Icons.expand_more_rounded,
            size: 20,
            color: colors.inkMuted,
          ),
          style: theme.textTheme.bodyMedium?.copyWith(color: colors.ink),
          items: [
            for (final option in JellyfinAudioQuality.values)
              DropdownMenuItem(value: option, child: Text(option.label)),
          ],
          onChanged: (value) {
            if (value == null) return;
            unawaited(controller.setAudioQuality(value));
          },
        ),
      ],
    );
  }
}

class _GenreRow extends StatelessWidget {
  const _GenreRow({required this.controller, required this.onChoose});

  final JellyfinController controller;
  final VoidCallback onChoose;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final selections = controller.genreSelections;
    final value = selections.isEmpty
        ? (controller.configured
              ? 'Not chosen — the Random row is hidden'
              : 'Pair Jellyfin first')
        : selections.map((selection) => selection.label).join(', ');

    return Row(
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('Random genres', style: theme.textTheme.bodyLarge),
              const SizedBox(height: 2),
              Text(
                value,
                maxLines: 1,
                overflow: TextOverflow.ellipsis,
                style: theme.textTheme.bodySmall?.copyWith(
                  color: controller.configured
                      ? colors.inkMuted
                      : colors.inkFaint,
                ),
              ),
            ],
          ),
        ),
        const SizedBox(width: 8),
        TextButton(
          onPressed: controller.configured ? onChoose : null,
          style: TextButton.styleFrom(foregroundColor: colors.accent),
          child: const Text('Choose'),
        ),
      ],
    );
  }
}

class _QuickConnectCode extends StatelessWidget {
  const _QuickConnectCode({required this.controller});

  final JellyfinController controller;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final code = controller.quickConnectCode ?? '';

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Container(
          width: double.infinity,
          padding: const EdgeInsets.symmetric(horizontal: 22, vertical: 18),
          decoration: BoxDecoration(
            color: colors.accentSoft,
            borderRadius: BorderRadius.circular(18),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                'Quick Connect code',
                style: theme.textTheme.labelMedium?.copyWith(
                  color: colors.inkMuted,
                ),
              ),
              const SizedBox(height: 4),
              SelectableText(
                code,
                style: theme.textTheme.headlineMedium?.copyWith(
                  color: colors.ink,
                  fontWeight: FontWeight.w700,
                  letterSpacing: 6,
                ),
              ),
              const SizedBox(height: 6),
              Text(
                'Open Jellyfin, choose Quick Connect and enter this code. '
                'CarDash connects as soon as you approve it.',
                style: theme.textTheme.bodySmall?.copyWith(
                  color: colors.inkMuted,
                ),
              ),
            ],
          ),
        ),
        const SizedBox(height: 2),
        TextButton(
          onPressed: controller.cancelPairing,
          style: TextButton.styleFrom(
            foregroundColor: colors.inkMuted,
            padding: EdgeInsets.zero,
            alignment: Alignment.centerLeft,
          ),
          child: const Text('Cancel'),
        ),
      ],
    );
  }
}