import 'dart:async';
import 'dart:convert';
import 'dart:io';

// Sonde JSON-RPC read-only contre le HEMS .75.
// Usage: dart probe.dart <host> <method> [jsonParams]
Future<void> main(List<String> args) async {
  final host   = args.isNotEmpty ? args[0] : '192.168.1.75';
  final method = args.length > 1 ? args[1] : 'NymeaEnergy.GetLoadConfig';
  final params = args.length > 2
      ? jsonDecode(args[2]) as Map<String, dynamic>
      : <String, dynamic>{};

  final ws = await WebSocket.connect('ws://$host:4444')
      .timeout(const Duration(seconds: 8));
  var id = 0;
  final pending = <int, Completer<Map<String, dynamic>>>{};

  ws.listen((raw) {
    final m = jsonDecode(raw as String) as Map<String, dynamic>;
    final rid = m['id'];
    if (rid is int && pending.containsKey(rid)) {
      pending.remove(rid)!.complete(m);
    } else if (m['notification'] != null) {
      stderr.writeln('[notif] ${m['notification']}');
    }
  });

  Future<Map<String, dynamic>> call(String m, [Map<String, dynamic> p = const {}]) {
    final myId = ++id;
    final c = Completer<Map<String, dynamic>>();
    pending[myId] = c;
    ws.add(jsonEncode({'id': myId, 'method': m, 'params': p}));
    return c.future.timeout(const Duration(seconds: 15));
  }

  final hello = await call('JSONRPC.Hello');
  stderr.writeln('--- JSONRPC.Hello ---');
  stderr.writeln(const JsonEncoder.withIndent('  ').convert(hello['params']));

  final res = await call(method, params);
  stdout.writeln(const JsonEncoder.withIndent('  ').convert(res));

  await ws.close();
}