import "dart:io";

import "package:flutter_riverpod/flutter_riverpod.dart";
import "package:nexus/controllers/client.dart";
import "package:nexus/controllers/unified_push_distributors.dart";

class UnifiedPushAllowedController extends AsyncNotifier<String?> {
  @override
  Future<String?> build() async {
    final distributors = await ref.watch(
      UnifiedPushDistributorsController.provider.future,
    );

    if (distributors.isEmpty) {
      return "No valid distributors found. ${Platform.isLinux
          ? "Try installing KUnifiedPush"
          : Platform.isAndroid
          ? "Try installing Google Play Services or NTFY"
          : "Your platform is not currently supported by UnifiedPush"}.";
    }

    final capabilities = await ref
        .read(ClientController.provider.notifier)
        .getCapabilities();

    if (capabilities.webpush?.vapid == null) {
      return "Your homeserver does not support MSC4174 (Web Push), and therefore cannot send notifications to Nexus.";
    }

    return null;
  }

  static final provider =
      AsyncNotifierProvider.autoDispose<UnifiedPushAllowedController, String?>(
        UnifiedPushAllowedController.new,
      );
}