hermes/lib/page/login

import 'dart:io';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'roomlist';


class LoginPage extends StatefulWidget {
  LoginPage({Key key, this.settings}) : super(key: key);

  final SharedPreferences settings;
  
  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  static const String def_home_server = "https://pink.packageloss.eu:8448";

  String _matrixId;
  String _password;
  String _homeServer = "https://pink.packageloss.eu:8448";

  String _failureMessage = "";
  
  void _showMainView() {
    Navigator.pushReplacement(
      context, MaterialPageRoute(builder: (BuildContext context) => MyHomePage(settings: widget.settings)));
  } 

  void _doLogin() async {
    var client = new HttpClient();
    await client.postUrl(Uri.parse(_homeServer)
      .replace(path: "/_matrix/client/r0/login")).then((req) {
        req.headers.contentType = new ContentType("application", "json", charset: "utf-8");
        var data = new JsonEncoder().convert(<String,dynamic>{
          "type": "m.login.password",
          "identifier": <String,String>{
            "type": "m.id.user",
            "user": _matrixId,
          },
          "password": _password,
          "initial_device_display_name": "Hermes alpha",
        });
        req.write(data);
        return req.close();
    }).then((resp) {
      return resp.transform(utf8.decoder).join().then((cont) {
        if (resp.statusCode != 200) {
          _failureMessage = "HTTP ${resp.statusCode}";
        }
        var json;
        try {
          json = new JsonDecoder().convert(cont);
        }
        catch(e) {
        _failureMessage = "Invalid JSON!";
        return;
        }
        // I hate switch statements
        if (resp.statusCode == 403) {
          _failureMessage = json["error"];
        } else if (resp.statusCode == 200) {
          var s = widget.settings;
          s.setString("access_token", json["access_token"]);
          s.setString("matrix_id", json["user_id"]);
          //this means the hs uri was correct, but not neccesarily what the server gives us
          s.setString("home_server", Uri.parse(_homeServer).toString()); // jep, stealing that again
          //s.setString("home_server", json["home_server"]);
          s.setString("device_id", json["device_id"]);
          s.setBool("logged_in", true);
          _showMainView();
        } else {
          _failureMessage = "{$resp.statusCode}: ${json}";
        }
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Login"),
      ),
      body: Center(
        child: Padding(
          padding: EdgeInsets.all(8.0),
          child: ListView(
            children: <Widget>[
              TextField(autocorrect: false, onChanged: (s) { _matrixId = s; }, autofocus: true),
              Text("Matrix ID"),
              TextField(autocorrect: false, obscureText: true, onChanged: (s) { _password = s; }),
              Text("Password"),
              TextField(
                autocorrect: false,
                controller: TextEditingController(text: def_home_server),
                onChanged: (s) { _homeServer = s; }
              ),
              Text("Home server"),
              RaisedButton(
                child: Text("Login"),
                onPressed: () { setState(() { _doLogin(); }); },
              ),
              Text(_failureMessage),
            ],
          ),
        ),
      ),
    );
  }
}