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

import 'package:result_monad/result_monad.dart';

import 'models.dart';

class FriendicaClient {
  final String username;
  final String password;
  final String serverName;
  final _client = HttpClient();
  late final String _authHeader;

  FriendicaClient(
      {required this.username,
      required this.password,
      required this.serverName}) {
    final authenticationString = "$username:$password";
    final encodedAuthString = base64Encode(utf8.encode(authenticationString));
    _authHeader = "Basic $encodedAuthString";
  }

  FutureResult<List<FriendicaEntry>, String> getTimeline(
      String userId, int page, int count) async {
    final request = Uri.parse(
        'https://$serverName/api/statuses/user_timelineuser_id=$userId&count=$count&page=$page');
    return (await _getApiRequest(request)).mapValue((postsJson) =>
        postsJson.map((postJson) => FriendicaEntry.fromJson(postJson)).toList());
  }

  FutureResult<List<dynamic>, String> _getApiRequest(Uri url) async {
    // TODO Error mode against: bad server URL, bad auth, bad path, empty response
    final request = await _client.getUrl(url);
    request.headers.add('authorization', _authHeader);
    request.headers.contentType =
        ContentType('application', 'json', charset: 'utf-8');
    final response = await request.close();
    final body = await response.transform(utf8.decoder).join('');
    File('/tmp/response.json').writeAsStringSync(body);
    final bodyJson = jsonDecode(body) as List<dynamic>;
    return Result.ok(bodyJson);
  }
}