home.dart

import 'package:flutter/material.dart';
import 'package:flutter_web_browser/flutter_web_browser.dart';
import 'package:flutter_app_auth_wrapper/flutter_app_auth_wrapper.dart';
import 'package:url_launcher/url_launcher.dart';
import 'dart:developer';
import 'dart:convert';

import '../config.dart';

class Home extends StatefulWidget {
  Home({@required this.mode, @required this.invokerURL, @required this.setMode});
  final String mode;
  final String invokerURL;
  final void Function(String) setMode;

  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  initState() {
    super.initState();
    showMode(widget.mode);

    FlutterAppAuthWrapper.eventStream().listen((data) {
      var token = json.decode(data.toString())["access_token"];
      _showAlert(token);
    });
  }

  Future<void> _showAlert(token) {
    return showDialog<void>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Authorization success'),
          actions: <Widget>[
            FlatButton(
              child: Text('Go back'),
              onPressed: () async {
                Navigator.of(context).pop();
                widget.setMode("");

                log("Open ${widget.invokerURL}");
                try {
                  await launch("${widget.invokerURL}?token=$token");
                } catch (e) {
                  log("Error launching url ${widget.invokerURL}");
                }
              },
            ),
          ],
        );
      },
    );
  }

  @override
  void didUpdateWidget(Home oldWidget) {
    // this method IS called when parent widget passes new "props"
    // unlike React, this method IS called _before_ the build
    // unlike React, this method ISN'T called after setState()
    if (widget.mode != oldWidget.mode) {
      showMode(widget.mode);
    }
    super.didUpdateWidget(oldWidget);
  }

  showMode(mode) {
    log(mode);
    if (mode == "app") {
      openVereign();
    } else if (mode == "oauth") {
      startOAuth();
    }
  }

  openVereign() {
    FlutterWebBrowser.openWebPage(url: APP_HOST, androidToolbarColor: Color(0xFFd51d32));
  }

  startOAuth() {
    FlutterAppAuthWrapper.startAuth(
      AuthConfig(
        clientId: CLIENT_ID,
        clientSecret: CLIENT_SECRET,
        redirectUrl: REDIRECT_URL,
        state: "login",
        prompt: "consent",
        endpoint: AuthEndpoint(
            auth: AUTH_ENDPOINT, token: TOKEN_ENDPOINT),
        scopes: [
          "user_account_status",
          "user_territory",
          "user_profile"
        ],
      ),
    );
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: SafeArea(
            child: SingleChildScrollView(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: <Widget>[
                    _urlButton(context, "Open Dashboard", openVereign),
                    _urlButton(context, "Authorize with Vereign", startOAuth),
                  ]
                ))));
  }
  Widget _urlButton(BuildContext context, String title, listener) {
    return Container(
        padding: EdgeInsets.all(20.0),
        child: FlatButton(
          color: Theme.of(context).primaryColor,
          textColor: Colors.white,
          padding: const EdgeInsets.symmetric(horizontal: 50.0, vertical: 15.0),
          child: Text(title),
          onPressed: listener
        ));
  }
}