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

/// Base app-level exception for expected, user-facing failures.
class AppException implements Exception {
  final String message;

  const AppException(this.message);

  @override
  String toString() => message;
}

class AuthRequiredException extends AppException {
  const AuthRequiredException(super.message);
}

class PermissionDeniedException extends AppException {
  const PermissionDeniedException(super.message);
}

class NotFoundException extends AppException {
  const NotFoundException(super.message);
}

class ValidationException extends AppException {
  const ValidationException(super.message);
}

String userMessageForError(
  Object error, {
  String fallback = 'Something went wrong. Please try again.',
}) {
  if (error is AppException) {
    return error.message;
  }

  if (error is AuthException) {
    return error.message;
  }

  final raw = error.toString();
  final normalized = raw.toLowerCase();

  if (normalized.contains('socket') ||
      normalized.contains('network') ||
      normalized.contains('timeout')) {
    return 'Network issue. Please check your connection and try again.';
  }

  if (normalized.contains('permission') || normalized.contains('not allowed')) {
    return 'You do not have permission for this action.';
  }

  if (normalized.contains('signed in')) {
    return 'Please sign in again and retry.';
  }

  return fallback;
}

void logError(String scope, Object error, [StackTrace? stackTrace]) {
  debugPrint('[$scope] $error');
  if (stackTrace != null) {
    debugPrint('$stackTrace');
  }
}