import 'dart:convert';
import 'dart:async';
import 'package:flutter/rendering.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:web_socket_channel/io.dart';
import 'package:progress_indicators/progress_indicators.dart';
import 'package:event_bus/event_bus.dart';
import 'package:flutter/widgets.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:flutter/services.dart';
import 'package:date_format/date_format.dart';

part 'entity_class/entity.class.dart';
part 'entity_class/button_entity.class.dart';
part 'entity_class/datetime_entity.class.dart';
part 'entity_class/select_entity.class.dart';
part 'entity_class/slider_entity.class.dart';
part 'entity_class/switch_entity.class.dart';
part 'entity_class/text_entity.class.dart';

part 'settings.page.dart';
part 'home_assistant.class.dart';
part 'log.page.dart';
part 'entity.page.dart';
part 'utils.class.dart';
part 'mdi.class.dart';
part 'entity_collection.class.dart';
part 'view_builder.class.dart';
part 'view_class.dart';
part 'card_class.dart';

EventBus eventBus = new EventBus();
const String appName = "HA Client";
const appVersion = "0.2.4";

String homeAssistantWebHost;

void main() {
  FlutterError.onError = (errorDetails) {
    TheLogger.log("Error", "${errorDetails.exception}");
    if (TheLogger.isInDebugMode) {
      FlutterError.dumpErrorToConsole(errorDetails);
    }
  };

  runZoned(() {
    runApp(new HAClientApp());
  }, onError: (error, stack) {
    TheLogger.log("Global error", "$error");
    if (TheLogger.isInDebugMode) {
      debugPrint("$stack");
    }
  });
}

class HAClientApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: appName,
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      initialRoute: "/",
      routes: {
        "/": (context) => MainPage(title: 'HA Client'),
        "/connection-settings": (context) => ConnectionSettingsPage(title: "Connection Settings"),
        "/log-view": (context) => LogViewPage(title: "Log")
      },
    );
  }
}

class MainPage extends StatefulWidget {
  MainPage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MainPageState createState() => new _MainPageState();
}

class _MainPageState extends State<MainPage> with WidgetsBindingObserver {
  HomeAssistant _homeAssistant;
  EntityCollection _entities;
  //Map _instanceConfig;
  String _apiEndpoint;
  String _apiPassword;
  String _authType;
  int _uiViewsCount = 0;
  String _instanceHost;
  int _errorCodeToBeShown = 0;
  String _lastErrorMessage = "";
  StreamSubscription _stateSubscription;
  StreamSubscription _settingsSubscription;
  StreamSubscription _serviceCallSubscription;
  StreamSubscription _showEntityPageSubscription;
  StreamSubscription _refreshDataSubscription;
  bool _isLoading = true;
  bool _settingsLoaded = false;

  @override
  void initState() {
    super.initState();
    _settingsLoaded = false;
    WidgetsBinding.instance.addObserver(this);

    _homeAssistant = HomeAssistant();

    _settingsSubscription = eventBus.on<SettingsChangedEvent>().listen((event) {
      TheLogger.log("Debug","Settings change event: reconnect=${event.reconnect}");
      if (event.reconnect) {
        _homeAssistant.disconnect().then((_){
          _loadConnectionSettings().then((b){
            _refreshData();
          }, onError: (_) {
            setState(() {
              _lastErrorMessage = _;
              _errorCodeToBeShown = 5;
            });
          }
          );
        });
      }
    });
    _loadConnectionSettings().then((_){
      _createConnection();
    }, onError: (_) {
      setState(() {
        _lastErrorMessage = _;
        _errorCodeToBeShown = 5;
      });
    });
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    TheLogger.log("Debug","$state");
    if (state == AppLifecycleState.resumed && _settingsLoaded) {
      _refreshData();
    }
  }

  _loadConnectionSettings() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String domain = prefs.getString('hassio-domain');
    String port = prefs.getString('hassio-port');
    _instanceHost = "$domain:$port";
    _apiEndpoint = "${prefs.getString('hassio-protocol')}://$domain:$port/api/websocket";
    homeAssistantWebHost = "${prefs.getString('hassio-res-protocol')}://$domain:$port";
    _apiPassword = prefs.getString('hassio-password');
    _authType = prefs.getString('hassio-auth-type');
    if ((domain == null) || (port == null) || (_apiPassword == null) ||
        (domain.length == 0) || (port.length == 0) || (_apiPassword.length == 0)) {
      throw("Check connection settings");
    } else {
      _settingsLoaded = true;
    }
  }

  _createConnection() {
    _refreshData();
    if (_stateSubscription == null) {
      _stateSubscription = eventBus.on<StateChangedEvent>().listen((event) {
        setState(() {
          if (event.localChange) {
            _entities
                .get(event.entityId)
                .state = event.newState;
          }
        });
      });
    }
    if (_serviceCallSubscription == null) {
      _serviceCallSubscription =
          eventBus.on<ServiceCallEvent>().listen((event) {
            _callService(event.domain, event.service, event.entityId,
                event.additionalParams);
          });
    }

    if (_showEntityPageSubscription == null) {
      _showEntityPageSubscription =
          eventBus.on<ShowEntityPageEvent>().listen((event) {
            _showEntityPage(event.entity);
          });
    }

    if (_refreshDataSubscription == null) {
      _refreshDataSubscription = eventBus.on<RefreshDataEvent>().listen((event){
        _refreshData();
      });
    }
  }

  _refreshData() async {
    _homeAssistant.updateConnectionSettings(_apiEndpoint, _apiPassword, _authType);
    setState(() {
      _isLoading = true;
    });
    _errorCodeToBeShown = 0;
    _lastErrorMessage = "";
    await _homeAssistant.fetch().then((result) {
      setState(() {
        //_instanceConfig = _homeAssistant.instanceConfig;
        _entities = _homeAssistant.entities;
        _uiViewsCount = _homeAssistant.viewsCount;
        _isLoading = false;
      });
    }).catchError((e) {
      _setErrorState(e);
    });
    eventBus.fire(RefreshDataFinishedEvent());
  }

  _setErrorState(e) {
    setState(() {
      _errorCodeToBeShown = e["errorCode"] != null ? e["errorCode"] : 99;
      _lastErrorMessage = e["errorMessage"] ?? "Unknown error";
      _isLoading = false;
    });
  }

  void _callService(String domain, String service, String entityId, Map<String, String> additionalParams) {
    _homeAssistant.callService(domain, service, entityId, additionalParams).catchError((e) => _setErrorState(e));
  }

  void _showEntityPage(Entity entity) {
    Navigator.push(
        context,
        MaterialPageRoute(
          builder: (context) => EntityViewPage(entity: entity),
        )
    );
  }

  List<Tab> buildUIViewTabs() {
    //TODO move somewhere to ViewBuilder
    List<Tab> result = [];
    if (!_entities.isEmpty) {
      if (!_entities.hasDefaultView) {
        result.add(
            Tab(
                icon:
                  Icon(
                    MaterialDesignIcons.createIconDataFromIconName("mdi:home-assistant"),
                    size: 24.0,
                  )
            )
        );
      }
      _entities.viewList.forEach((viewId) {
        result.add(
            Tab(
                icon: MaterialDesignIcons.createIconWidgetFromEntityData(_entities.get(viewId), 24.0, null) ??
                    Icon(
                      MaterialDesignIcons.createIconDataFromIconName("mdi:home-assistant"),
                      size: 24.0,
                    )
            )
        );
      });
    }
    return result;
  }

  Widget _buildAppTitle() {
    Row titleRow = Row(
      children: [Text(_homeAssistant != null ? _homeAssistant.locationName : "")],
    );
    if (_isLoading) {
      titleRow.children.add(Padding(
        child: JumpingDotsProgressIndicator(
          fontSize: 26.0,
          color: Colors.white,
        ),
        padding: const EdgeInsets.fromLTRB(5.0, 0.0, 0.0, 30.0),
      ));
    }
    return titleRow;
  }

  Drawer _buildAppDrawer() {
    return new Drawer(
      child: ListView(
        children: <Widget>[
          new UserAccountsDrawerHeader(
            accountName: Text(_homeAssistant != null ? _homeAssistant.locationName : "Unknown"),
            accountEmail: Text(_instanceHost ?? "Not configured"),
            currentAccountPicture: new Image.asset('images/hassio-192x192.png'),
          ),
          new ListTile(
            leading: Icon(Icons.settings),
            title: Text("Connection settings"),
            onTap: () {
              Navigator.of(context).pop();
              Navigator.of(context).pushNamed('/connection-settings');
            },
          ),
          Container(
              height: 16.0,
              decoration: new BoxDecoration(
                border: new Border(
                    bottom: BorderSide(
                      width: 1.0,
                      color: Colors.black26,
                    )
                ),
              )
          ),
          new ListTile(
            leading: Icon(Icons.insert_drive_file),
            title: Text("Log"),
            onTap: () {
              Navigator.of(context).pop();
              Navigator.of(context).pushNamed('/log-view');
            },
          ),
          new ListTile(
            leading: Icon(MaterialDesignIcons.createIconDataFromIconName("mdi:github-circle")),
            title: Text("Report an issue"),
            onTap: () {
              Navigator.of(context).pop();
              HAUtils.launchURL("https://github.com/estevez-dev/ha_client_pub/issues/new");
            },
          ),
          Container(
            height: 16.0,
            decoration: new BoxDecoration(
              border: new Border(
                  bottom: BorderSide(
                    width: 1.0,
                    color: Colors.black26,
                  )
                ),
              )
          ),
          new AboutListTile(
            applicationName: appName,
            applicationVersion: appVersion,
            applicationLegalese: "Keyboard Crumbs | www.keyboardcrumbs.io",
          ),
          new ListTile(
            leading: Icon(MaterialDesignIcons.createIconDataFromIconName("mdi:coffee")),
            title: Text("Buy me a coffee"),
            onTap: () {
              Navigator.of(context).pop();
              HAUtils.launchURL("https://www.buymeacoffee.com/estevez");
            },
          )
        ],
      ),
    );
  }

  _checkShowInfo(BuildContext context) {
    if (_errorCodeToBeShown > 0) {
      String message = _lastErrorMessage;
      SnackBarAction action;
      switch (_errorCodeToBeShown) {
        case 9:
        case 11:
        case 7:
        case 1: {
            action = SnackBarAction(
                label: "Retry",
                onPressed: () {
                  _scaffoldKey?.currentState?.hideCurrentSnackBar();
                  _refreshData();
                },
            );
            break;
          }

        case 5: {
          message = "Check connection settings";
          action = SnackBarAction(
            label: "Open",
            onPressed: () {
              _scaffoldKey?.currentState?.hideCurrentSnackBar();
              Navigator.pushNamed(context, '/connection-settings');
            },
          );
          break;
        }

        case 6: {
          action = SnackBarAction(
            label: "Settings",
            onPressed: () {
              _scaffoldKey?.currentState?.hideCurrentSnackBar();
              Navigator.pushNamed(context, '/connection-settings');
            },
          );
          break;
        }

        case 10: {
          action = SnackBarAction(
            label: "Refresh",
            onPressed: () {
              _scaffoldKey?.currentState?.hideCurrentSnackBar();
              _refreshData();
            },
          );
          break;
        }

        case 8: {
          action = SnackBarAction(
            label: "Reconnect",
            onPressed: () {
              _scaffoldKey?.currentState?.hideCurrentSnackBar();
              _refreshData();
            },
          );
          break;
        }
      }
      Timer(Duration(seconds: 1), () {
        _scaffoldKey.currentState.hideCurrentSnackBar();
        _scaffoldKey.currentState.showSnackBar(
            SnackBar(
                content: Text("$message (code: $_errorCodeToBeShown)"),
                action: action,
                duration: Duration(hours: 1),
            )
        );
      });
    } else {
      _scaffoldKey?.currentState?.hideCurrentSnackBar();
    }
  }

  final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();

  Scaffold _buildScaffold(bool empty) {
    return Scaffold(
      key: _scaffoldKey,
      appBar: AppBar(
        title: _buildAppTitle(),
        bottom: empty ? null : TabBar(tabs: buildUIViewTabs()),
      ),
      drawer: _buildAppDrawer(),
      body: empty ?
        Center(
          child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(
                  MaterialDesignIcons.createIconDataFromIconName("mdi:home-assistant"),
                  size: 100.0,
                  color: _errorCodeToBeShown == 0 ? Colors.blue : Colors.redAccent,
                ),
              ]
          ),
        )
        :
        _homeAssistant.buildViews(context)
    );
  }

  @override
  Widget build(BuildContext context) {
    _checkShowInfo(context);
    // This method is rerun every time setState is called.
    if (_entities == null) {
      return _buildScaffold(true);
    } else {
      return DefaultTabController(
          length: _uiViewsCount,
          child: _buildScaffold(false)
      );
    }
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    if (_stateSubscription != null) _stateSubscription.cancel();
    if (_settingsSubscription != null) _settingsSubscription.cancel();
    if (_serviceCallSubscription != null) _serviceCallSubscription.cancel();
    if (_showEntityPageSubscription != null) _showEntityPageSubscription.cancel();
    if (_refreshDataSubscription != null) _refreshDataSubscription.cancel();
    _homeAssistant.disconnect();
    super.dispose();
  }
}