LocalSpend-Tracker/lib/common/apifunctions/request_login_api.dart

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

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:local_spend/common/functions/save_current_login.dart';
import 'package:local_spend/common/functions/show_dialog_single_button.dart';
import 'package:local_spend/model/json/login_model.dart';

Future<void> _incorrectDialog(BuildContext context) async {
  return showDialog<void>(
    context: context,
    barrierDismissible: true,
    builder: (BuildContext context) {
      return AlertDialog(
        title: Text("Unable to Login"),
        content: Text("Incorrect login details. Please try again."),
        actions: <Widget>[
          FlatButton(
            child: Text('OK'),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
        ],
      );
    },
  );
}

Future<LoginModel> requestLoginAPI(
    BuildContext context, String email, String password) async {
  //var apiUrl = ConfigWrapper.of(context).apiKey;
  final url = "https://dev.peartrade.org/api/login";

  Map<String, String> body = {
    'email': email,
    'password': password,
  };

//  debugPrint('$body');

  final response = await http.post(
    url,
    body: json.encode(body),
  );

//  debugPrint(response.body);

  if (response.statusCode == 200) {
    final responseJson = json.decode(response.body);
    var user = new LoginModel.fromJson(responseJson);

    saveCurrentLogin(responseJson, body["email"]);
    Navigator.of(context).pushReplacementNamed('/HomePage');

    return LoginModel.fromJson(responseJson);
  } else {
//    debugPrint("Invalid, either credentials are wrong or server is down");

    final responseJson = json.decode(response.body);

    saveCurrentLogin(responseJson, body["email"]);

    _incorrectDialog(context);

    return null;
  }
}