import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:url_launcher/url_launcher.dart';

import '../../app/router.dart';
import '../../app/theme.dart';
import '../../data/user_library.dart';
import '../../offline/download_store.dart';
import '../player/sound_sheet.dart';

const supportEmail = 'support@nkbmusic.com';

Future<void> contactSupport({String subject = 'Nanga Kathai'}) =>
    launchUrl(Uri(scheme: 'mailto', path: supportEmail, query: 'subject=${Uri.encodeComponent(subject)}'));

/// Download only on Wi-Fi (on by default, so nobody burns their mobile data by surprise).
class WifiOnlyDownloads extends Notifier<bool> {
  static const _key = 'downloads_wifi_only';

  @override
  bool build() => ref.read(sharedPrefsProvider).getBool(_key) ?? true;

  void set(bool value) {
    state = value;
    ref.read(sharedPrefsProvider).setBool(_key, value);
  }
}

final wifiOnlyDownloadsProvider = NotifierProvider<WifiOnlyDownloads, bool>(WifiOnlyDownloads.new);

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

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final wifiOnly = ref.watch(wifiOnlyDownloadsProvider);
    final downloads = ref.watch(downloadsProvider);
    final mb = (downloads.totalBytes / (1 << 20)).round();

    Widget section(String title) => Padding(
          padding: const EdgeInsets.fromLTRB(16, 20, 16, 4),
          child: Text(title.toUpperCase(),
              style: const TextStyle(color: NkColors.sun, fontSize: 12, fontWeight: FontWeight.w700, letterSpacing: 1.2)),
        );
    Widget tile(IconData icon, String title, {String? subtitle, VoidCallback? onTap}) => ListTile(
          leading: Icon(icon),
          title: Text(title),
          subtitle: subtitle == null ? null : Text(subtitle, style: const TextStyle(color: NkColors.muted)),
          trailing: onTap == null ? null : const Icon(Icons.chevron_right, color: NkColors.muted),
          onTap: onTap,
        );

    return Scaffold(
      appBar: AppBar(title: const Text('Settings & help')),
      body: ListView(
        padding: const EdgeInsets.only(bottom: 32),
        children: [
          section('Account'),
          if (isSignedIn)
            tile(Icons.person_outline, 'Your profile', onTap: () => context.push('/profile'))
          else
            tile(Icons.login, 'Sign in or create an account',
                subtitle: 'Listen to full songs and download them', onTap: () => context.push('/login?mode=signup')),
          section('Playback'),
          tile(Icons.equalizer_rounded, 'Sound and equalizer', onTap: () => showSoundSettings(context)),
          section('Downloads'),
          SwitchListTile(
            secondary: const Icon(Icons.wifi),
            title: const Text('Download on Wi-Fi only'),
            subtitle: const Text('Saves your mobile data', style: TextStyle(color: NkColors.muted)),
            value: wifiOnly,
            onChanged: ref.read(wifiOnlyDownloadsProvider.notifier).set,
          ),
          tile(Icons.sd_storage_outlined, 'Storage used',
              subtitle: '${downloads.entries.length} songs · $mb MB',
              onTap: downloads.entries.isEmpty ? null : () => _removeAll(context, ref)),
          // The support tips aren't set up on the App Store yet, so iOS doesn't offer them.
          if (defaultTargetPlatform != TargetPlatform.iOS) ...[
            section('Support us'),
            tile(Icons.favorite_outline, 'Support Nanga Kathai',
                subtitle: 'Help keep Badaga music free', onTap: () => context.push('/support')),
          ],
          section('Help'),
          tile(Icons.help_outline, 'Help & FAQ', onTap: () => context.push('/help')),
          tile(Icons.flag_outlined, 'Is this your song? Report a song', onTap: () => context.push('/report')),
          tile(Icons.mail_outline, 'Contact us', subtitle: supportEmail, onTap: () => contactSupport()),
          section('About'),
          tile(Icons.info_outline, 'About Nanga Kathai', onTap: () => context.push('/about')),
          tile(Icons.privacy_tip_outlined, 'Privacy Policy', onTap: () => context.push('/privacy')),
          tile(Icons.description_outlined, 'Terms of Use', onTap: () => context.push('/terms')),
          tile(Icons.code, 'Open-source licences',
              onTap: () => showLicensePage(context: context, applicationName: 'Nanga Kathai', applicationVersion: '1.0.0')),
          const Padding(
            padding: EdgeInsets.fromLTRB(16, 16, 16, 0),
            child: Text('Nanga Kathai 1.0.0 · Metatroncube Software Solutions',
                style: TextStyle(color: NkColors.muted, fontSize: 12)),
          ),
        ],
      ),
    );
  }

  void _removeAll(BuildContext context, WidgetRef ref) {
    showDialog<void>(
      context: context,
      builder: (dialog) => AlertDialog(
        title: const Text('Remove all downloads?'),
        content: const Text('This frees up space. You can download the songs again any time.'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(dialog), child: const Text('Cancel')),
          FilledButton(
            onPressed: () {
              ref.read(downloadStoreProvider).removeAll();
              Navigator.pop(dialog);
            },
            child: const Text('Remove'),
          ),
        ],
      ),
    );
  }
}