saat-app/flutter/lib/api/odoo_client.dart

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

import 'package:http/http.dart' as http;

/// Klien JSON-RPC utk Odoo 17. Authenticate + execute_kw.
class OdooClient {
  OdooClient({required this.baseUrl, required this.db, required this.username, required this.password})
      : _http = http.Client();

  final String baseUrl; // mis: http://192.168.x.x:18069
  final String db;      // nama db, default 'odoo'
  final String username;
  final String password;

  final http.Client _http;
  int? _uid;

  Uri get _endpoint => Uri.parse('$baseUrl/jsonrpc');

  Future<int> authenticate() async {
    final result = await _call('common', 'authenticate', [db, username, password, {}]);
    if (result is int && result > 0) {
      _uid = result;
      return result;
    }
    throw Exception('Login gagal: periksa kredensial / URL Odoo');
  }

  Future<dynamic> executeKwd(String model, String method,
      {List<dynamic> args = const [], Map<String, dynamic>? kwargs}) async {
    _uid ??= await authenticate();
    final params = [
      db,
      _uid,
      password,
      model,
      method,
      args,
      if (kwargs != null) kwargs,
    ];
    return _call('object', 'execute_kw', params);
  }

  Future<dynamic> _call(String service, String method, List<dynamic> args) async {
    final body = {
      'jsonrpc': '2.0',
      'method': 'call',
      'params': {
        'service': service,
        'method': method,
        'args': args,
      },
    };
    try {
      final resp = await _http
          .post(_endpoint,
              headers: {'Content-Type': 'application/json'}, body: jsonEncode(body))
          .timeout(const Duration(seconds: 25));
      final json = jsonDecode(resp.body) as Map<String, dynamic>;
      if (json.containsKey('error')) {
        final err = json['error'] as Map?;
        String? message = (err?['data'] as Map?)?['message'] as String? ??
            (err?['message'] as String?) ??
            'Unknown Odoo error';
        throw Exception('Odoo error: $message');
      }
      return json['result'];
    } on TimeoutException {
      throw Exception('Timeout — pastikan server Odoo:18069 tercapai');
    } on http.ClientException catch (e) {
      throw Exception('Koneksi gagal: ${e.message}');
    }
  }

  void close() => _http.close();
}