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

import 'package:comunic/helpers/account_credentials_helper.dart';
import 'package:comunic/models/api_request.dart';
import 'package:comunic/models/api_response.dart';
import 'package:comunic/models/config.dart';
import 'package:http/http.dart' as http;

/// API Helper
///
/// @author Pierre HUBERT

class APIHelper {
  /// Execute a [request] on the server and returns a [APIResponse]
  ///
  /// This method should never throw but the response code of the [APIResponse]
  /// should be verified before accessing response content
  Future<APIResponse> exec(APIRequest request) async {
    try {
      //Add API tokens
      request.addString("serviceName", config().serviceName);
      request.addString("serviceToken", config().serviceToken);

      //Add user tokens (if required)
      if (request.needLogin) {
        final tokens = await AccountCredentialsHelper().get();
        assert(tokens != null);
        request.addString("userToken1", tokens.tokenOne);
        request.addString("userToken2", tokens.tokenTwo);
      }

      // Determine server URL
      final path = config().apiServerUri + request.uri;
      Uri url;
      if (!config().apiServerSecure)
        url = Uri.http(config().apiServerName, path);
      else
        url = Uri.https(config().apiServerName, path);

      final response = await http.post(
        url.toString(),
        body: request.args,
        encoding: utf8
      );

      if (response.statusCode != HttpStatus.ok)
        return APIResponse(response.statusCode, null);

      return APIResponse(response.statusCode, utf8.decode(response.bodyBytes));
    } on Exception catch (e) {
      print(e.toString());
      print("Could not execute a request!");
      return APIResponse(-1, null);
    }
  }
}