import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:spotiflac_android/l10n/l10n.dart';
import 'package:spotiflac_android/services/app_navigation_service.dart';
import 'package:spotiflac_android/services/platform_bridge.dart';
import 'package:spotiflac_android/utils/logger.dart';
import 'package:url_launcher/url_launcher.dart';

final _log = AppLogger('ExtensionAuthLauncher');

bool isExtensionVerificationRequired(Object error) {
  final message = error.toString().toLowerCase();
  return message.contains('verify_required') ||
      message.contains('verification_required') ||
      message.contains('verification required') ||
      message.contains('needsverification') ||
      message.contains('needs verification') ||
      message.contains('session is not authenticated') ||
      message.contains('unauthorized') ||
      message.contains('precondition required') ||
      _containsHttpStatusCode(message, '401') ||
      _containsHttpStatusCode(message, '428');
}

bool _containsHttpStatusCode(String message, String code) {
  return message.contains('http $code') ||
      message.contains('http status $code') ||
      message.contains('status $code') ||
      message.contains('$code for ') ||
      message.contains('$code:') ||
      message.contains('$code;');
}

Future<bool> openPendingExtensionVerification(
  String extensionId, {
  String browserMode = 'external_first',
  void Function(Uri authUri)? onAuthUri,
}) async {
  final normalizedExtensionId = extensionId.trim();
  if (normalizedExtensionId.isEmpty) return false;

  try {
    final pending = await PlatformBridge.getExtensionPendingAuth(
      normalizedExtensionId,
    );
    final authUrl = pending?['auth_url']?.toString().trim() ?? '';
    if (authUrl.isEmpty) return false;

    final uri = Uri.tryParse(authUrl);
    if (uri == null) return false;
    onAuthUri?.call(uri);

    final launched = await _launchVerificationUrl(uri, browserMode);

    if (launched) {
      _log.i('Opened verification challenge for $normalizedExtensionId');
    } else {
      _log.w(
        'Could not open verification challenge for $normalizedExtensionId',
      );
      return showExtensionVerificationHelpDialog(
        normalizedExtensionId,
        uri,
        browserMode: browserMode,
        immediateFailure: true,
      );
    }
    return launched;
  } catch (e) {
    _log.w(
      'Failed to open verification challenge for $normalizedExtensionId: $e',
    );
    return false;
  }
}

Timer? scheduleExtensionVerificationHelpDialog(
  String extensionId,
  Uri? authUri, {
  String browserMode = 'external_first',
  Duration delay = const Duration(seconds: 20),
}) {
  final normalizedExtensionId = extensionId.trim();
  if (normalizedExtensionId.isEmpty || authUri == null) return null;

  return Timer(delay, () {
    unawaited(
      showExtensionVerificationHelpDialog(
        normalizedExtensionId,
        authUri,
        browserMode: browserMode,
      ),
    );
  });
}

Future<bool> showExtensionVerificationHelpDialog(
  String extensionId,
  Uri authUri, {
  String browserMode = 'external_first',
  bool immediateFailure = false,
}) async {
  final context = AppNavigationService.rootNavigatorKey.currentContext;
  if (context == null) {
    _log.w('Cannot show verification help dialog without root context');
    return false;
  }

  final l10n = context.l10n;
  final title = immediateFailure
      ? l10n.extensionVerificationHelpTitleManual
      : l10n.extensionVerificationHelpTitleWaiting;
  final message = immediateFailure
      ? l10n.extensionVerificationHelpMessageManual
      : l10n.extensionVerificationHelpMessageWaiting;

  await showDialog<void>(
    context: context,
    useRootNavigator: true,
    builder: (dialogContext) {
      final dialogL10n = dialogContext.l10n;
      return AlertDialog(
        title: Text(title),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Text(message),
            const SizedBox(height: 16),
            DecoratedBox(
              decoration: BoxDecoration(
                color: Theme.of(dialogContext).colorScheme.surfaceContainerHigh,
                borderRadius: BorderRadius.circular(8),
              ),
              child: Padding(
                padding: const EdgeInsets.all(12),
                child: SelectableText(
                  authUri.toString(),
                  maxLines: 4,
                  minLines: 1,
                ),
              ),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(dialogContext).pop(),
            child: Text(dialogL10n.extensionVerificationClose),
          ),
          TextButton.icon(
            icon: const Icon(Icons.copy),
            label: Text(dialogL10n.extensionVerificationCopyLink),
            onPressed: () {
              Clipboard.setData(ClipboardData(text: authUri.toString()));
              ScaffoldMessenger.maybeOf(dialogContext)?.showSnackBar(
                SnackBar(
                  content: Text(dialogL10n.extensionVerificationLinkCopied),
                ),
              );
            },
          ),
          FilledButton.icon(
            icon: const Icon(Icons.open_in_browser),
            label: Text(dialogL10n.extensionVerificationOpenBrowser),
            onPressed: () {
              unawaited(_launchVerificationUrl(authUri, browserMode));
            },
          ),
        ],
      );
    },
  );
  return true;
}

Future<bool> _launchVerificationUrl(Uri uri, String browserMode) async {
  final preferInApp = browserMode.trim().toLowerCase() == 'in_app_first';
  final firstMode = preferInApp
      ? LaunchMode.inAppBrowserView
      : LaunchMode.externalApplication;
  final fallbackMode = preferInApp
      ? LaunchMode.externalApplication
      : LaunchMode.inAppBrowserView;

  var launched = await launchUrl(uri, mode: firstMode);
  if (!launched) {
    launched = await launchUrl(uri, mode: fallbackMode);
  }
  return launched;
}