import 'package:decpisos/funcoes_gerais.dart';
import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:webview_flutter/webview_flutter.dart';

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> with AutomaticKeepAliveClientMixin<HomeScreen> {
  bool error = false;
  String msg = '';
  @override
  Widget build(BuildContext context) {
    super.build(context);
    return SafeArea(
      child: this.error ? this._buildError() : WebView(
        initialUrl: FuncoesGerais.homeURL,
        javascriptMode: JavascriptMode.unrestricted,
        onWebResourceError: (err){
          this.error = true;
          this.msg = err.description;
          setState(() {
          });
        },
        navigationDelegate: (navigation){
          print(navigation.url);
          if (navigation.url.startsWith(FuncoesGerais.dominioPermitido)) {
            return NavigationDecision.navigate;
          }
          //print('allowing navigation to $request');
          launch(navigation.url);
          return NavigationDecision.prevent;
        },
      ),
    );
  }

  Widget _buildError(){
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Text(msg),
          RaisedButton(onPressed: (){
            this.error = false;
            this.msg = '';
            setState(() {
            });
          }, child: Text('Atualizar'),)
        ],
      ),
    );
  }

  @override
  bool get wantKeepAlive => true;
}