import 'package:flutter/foundation.dart';
import 'package:onesignal_flutter/onesignal_flutter.dart';

/// OneSignal service for managing push notifications and external user ID.
///
/// This service handles:
/// - Setting external user ID after login (using phone number)
/// - Restoring external user ID on app startup
/// - Clearing external user ID on logout
///
/// Usage:
/// ```dart
/// // After successful login
/// await OneSignalService.login(phoneNumber);
///
/// // On logout
/// await OneSignalService.logout();
/// ```
class OneSignalService {
  OneSignalService._();

  /// Login user to OneSignal by setting external user ID.
  ///
  /// This associates the device with the user's phone number,
  /// allowing targeted push notifications to specific users.
  ///
  /// [phoneNumber] - The user's phone number (used as external ID)
  static Future<void> login(String phoneNumber) async {
    try {
      // Set external user ID for targeting
      await OneSignal.login(phoneNumber);
      debugPrint('🔔 OneSignal: login - external_id set to $phoneNumber');
    } catch (e) {
      debugPrint('🔔 OneSignal error: Failed to set external user ID - $e');
    }
  }

  /// Logout user from OneSignal by removing external user ID.
  ///
  /// This disassociates the device from the user,
  /// so notifications won't be sent to this specific user anymore.
  static Future<void> logout() async {
    try {
      await OneSignal.logout();
      debugPrint('🔔 OneSignal: logout - external_id cleared');
    } catch (e) {
      debugPrint('🔔 OneSignal error: Failed to clear external user ID - $e');
    }
  }

  /// Add a tag to the user for segmentation.
  ///
  /// Tags can be used to segment users for targeted notifications.
  /// Example: tier = "diamond", role = "contractor"
  static Future<void> setTag(String key, String value) async {
    try {
      await OneSignal.User.addTagWithKey(key, value);
      debugPrint('🔔 OneSignal: tag set - $key: $value');
    } catch (e) {
      debugPrint('🔔 OneSignal error: Failed to set tag - $e');
    }
  }

  /// Add multiple tags at once.
  static Future<void> setTags(Map<String, String> tags) async {
    try {
      await OneSignal.User.addTags(tags);
      debugPrint('🔔 OneSignal: tags set - $tags');
    } catch (e) {
      debugPrint('🔔 OneSignal error: Failed to set tags - $e');
    }
  }

  /// Remove a tag from the user.
  static Future<void> removeTag(String key) async {
    try {
      await OneSignal.User.removeTag(key);
      debugPrint('🔔 OneSignal: tag removed - $key');
    } catch (e) {
      debugPrint('🔔 OneSignal error: Failed to remove tag - $e');
    }
  }

  /// Get the OneSignal subscription ID (player ID).
  ///
  /// This is the device-specific ID used by OneSignal.
  static String? get subscriptionId => OneSignal.User.pushSubscription.id;

  /// Check if push notifications are enabled.
  static bool get isPushEnabled =>
      OneSignal.User.pushSubscription.optedIn ?? false;
}