import 'package:flutter/material.dart';
import 'package:flutter/services.dart'; // for going in fullscreen mode
import 'package:flutter/scheduler.dart'; // to add scheduler start sending touch on touch start

import 'package:shared_preferences/shared_preferences.dart';

// import 'package:web_socket_channel/status.dart' as status;

// import 'ws_server_connection_handler.dart';
import 'package:web_socket_client/web_socket_client.dart';

import 'package:flutter_colorpicker/flutter_colorpicker.dart';

import 'package:flutter/foundation.dart'
    show kIsWeb; // to check of platform is web
import 'vibration/vibration_exporter.dart';

import "dart:convert";
import "dart:async";

void enterFullScreen() {
  SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersive, overlays: []);
}

void exitFullScreen() {
  SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual,
      overlays: SystemUiOverlay.values);
}

class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  @override
  State<HomeScreen> createState() {
    return HomeScreenState();
  }
}

class HomeScreenState extends State<HomeScreen> {
  late WebSocket socket;
  late double width, height;
  late SharedPreferences prefs;
  double containerHeight = 0, containerWidth = 0;

  late Timer sendTouchScheduler;
  Timer endSendTouchTimer = Timer(Duration.zero, () {});

  double touchsize = 100;
  double touchX = 0, touchY = 0;
  bool isTouching = false;

  bool hasCollided =
      false; // hascollided can be useful to show any type special effect later on

  late List<dynamic> userList;
  late List<String> roomidList, roomnameList;
  String currRoomId = "", currRoomName = "";
  String username = "";
  String userid = "";
  String profileColor = "ff000000";
  Map<String, Map> othersTouchPoints = {};
  final double outsidepadding = 15;
  final int touchRefreshRate = 1000 ~/ 30; // 30 fps
  // final int touchRefreshRate = 1000~/60;  // 60 fps
  // bool isConnected = false;

  GlobalKey headerKey = GlobalKey(); // to calculate the header's height

  @override
  void initState() {
    super.initState();
    enterFullScreen();
    roomidList = [];
    roomnameList = [];
    userList = [];

    // roomidList=["1","2"];
    // roomnameList=["room 1","room 2"];

    Map data = {
      "user": {
        "username": "enemy",
        "id": "string",
      },
      "position": {
        "x": 0.0 + touchsize / 2, // top left corner
        "y": 0.0 + touchsize / 2, // top left corner
      },
      "color": "ff2244bb", // Hex value.
      "intensity": 1, // Vibration intensity.
    };

    othersTouchPoints[data['user']['id']] = data;

    WidgetsBinding.instance.addPostFrameCallback((_) {
      // this function is called after the build method is done executing
      getPreferences();
      connectWebsocket();
    });

    // just for debugging
    // WidgetsBinding.instance.addPostFrameCallback((_){
    //   showSnackBar(getHeaderHeight().toString());
    // });

    // just for debugging vibrations
    // Vibration.vibrate(pattern:[100]);
    // Vibration.vibrate(pattern:[200,100]);
  }

  @override
  void dispose() {
    exitFullScreen();
    socket.close();
    super.dispose();
  }

  void showSnackBar(String text) {
    ScaffoldMessenger.of(context).hideCurrentSnackBar();
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(text)));
  }

  double? getHeaderHeight() {
    var size = headerKey.currentContext?.size;
    // debugPrint(size?.height);
    return size?.height;
  }

  void getPreferences() async {
    prefs = await SharedPreferences.getInstance();

    // initialize empty room list if no preferences found
    if (!prefs.containsKey("roomid_list")) {
      prefs.setStringList("roomid_list", []);
      prefs.setStringList("roomname_list", []);
    }
    // intialize from preferences
    setState(() {
      roomidList = prefs.getStringList("roomid_list")!;
      roomnameList = prefs.getStringList("roomname_list")!;
      username = prefs.getString(
          "username")!; // to get the username from device's local storage
      profileColor = prefs.getString(
          "profile_color")!; // to get the profilecolor from device's local storage
    });
  }

  void connectWebsocket() async {
    const timeout = Duration(seconds: 10);
    const backoff = ConstantBackoff(Duration(seconds: 1));
    const pingInterval = Duration(seconds: 3);

    final socketUri = Uri.parse(const String.fromEnvironment("WS_SERVER_URL",
        defaultValue: "ws://localhost:3000"));

    socket = WebSocket(
      socketUri,
      timeout: timeout,
      backoff: backoff,
      pingInterval: pingInterval,
    );

    socket.connection.listen((state) {
      debugPrint("state:\t $state");
      if (state is Connected || state is Reconnected) {
        // isConnected = true;
        onConnected();
      }

      // isConnected = false;

      if (state is Connecting || state is Reconnecting) {
        showSnackBar("Connecting");
      }

      if (state is Disconnected) {
        showSnackBar("Disconnected");
      }
    });

    socket.messages.listen(responseHandler);
  }

  bool isConnected(){
    return socket.connection.state is Connected || socket.connection.state is Reconnected;
  }
  void onConnected() {
    showSnackBar("connected");
    setUsername();

    // on connected test connection
    Object data = {"route": "test_connection"};
    socket.send(json.encode(data));
  }

  void setUsername() async {
    prefs = await SharedPreferences.getInstance();
    if (!isConnected()) {
      return;
    }
    // set username
    Map data = {
      "route": "set_username",
      "username": prefs.getString("username"),
    };

    socket.send(json.encode(data));
  }

  void responseHandler(message) {
    // message.get
    Map map;
    final String type;

    try {
      map = jsonDecode(message); // try to decode the message into json format
    } catch (e) {
      debugPrint("can't decode to json:\t$message");
      return;
    }

    // if any error found do nothing
    if (map.containsKey("error")) {
      debugPrint(map.toString());
      return;
    }

    type = map["message"]; // get the type of the message
  

    if (type == "test_connection_response") {
      // testing connection
      debugPrint("test_connection successful");
    } else if (type == "pong") {
      debugPrint("pong"); // handling pongs
    } else if (type == "set_username_response") {
      debugPrint(map.toString());
      setState(() {
        userid = map['user']['id']; // set our userid
      });
    } else if (type == "join_room_response") {
      // on error
      // debugPrint(map.toString());
      showSnackBar(map['status']);
    } else if (type == "room_update") {
      debugPrint(map.toString());
      if (currRoomId != map['roomId']) {
        // only update on room change
        setState(() {
          currRoomId = map['roomId'];
          currRoomName = map['roomId'];
        });
      }

      // update users list
      setState(() {
        userList = map['users'];
      });
    } else if (type == "send_vibration_response") {
      // handles when we send_touch without being in a room
      debugPrint(map.toString());
      showSnackBar(
          map['status']); // shows error that we are not part of the room
      setState(() {
        currRoomId = ""; // clears the current roomid
        currRoomName = "";
        userList = [];
      });
    } else if (type == "receive_touch") {
      if (map['user']['id'] == userid) {
        // this is touch which we originated so we ignore it
        // debugPrint("self touch received. Ignore this");
        return;
      }

      // touch received to update othersTouchPoints
      // debugPrint(map);
      if (map['type'] == 'enabled') {
        // add touch point

        // static height and width
        double staticHeight = getHeaderHeight()! +
            outsidepadding * 2; // this is the extra static height
        double staticWidth =
            outsidepadding * 2; // this is the extra static width

        // rescale point according to the screen
        map['position']['x'] *= width - staticWidth;
        map['position']['y'] *= height - staticHeight;

        // debugPrint(map['position']['x'].toString());
        // debugPrint(map['position']['y'].toString());
        setState(() {
          othersTouchPoints[map['id']] = map; // updating other's touch points
        });
      } else {
        // map['type']=='disabled'
        setState(() {
          othersTouchPoints.remove(map['id']); // delete the touch point
        });
      }
    }
  }

  void toggleContainer() {
    // to toggle the visibility of the center popup container
    if (containerHeight == 0) {
      setState(() {
        containerHeight = 200;
        containerWidth = 220;
      });
    } else {
      setState(() {
        containerHeight = 0;
        containerWidth = 0;
      });
    }
  }

  void createRoom({String roomId = ""}) async {
    // it is used to create a room in server
    // or to connect to an existing room
    Map data;
    print(isConnected());

    if (!isConnected()) {
      return;
    }

    // join room
    data = {
      "route": "join_room",
      "username": username,
    };

    // to join existing room
    if (roomId.isNotEmpty) {
      data["roomId"] = roomId;
    }
    socket.send(json.encode(data));

    // we will get in the room with the server data
    // from the room_update response
  }

  void joinRoomForm() {
    // popup for entering the room id to join an existing room

    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          content: SingleChildScrollView(
              child: Column(children: [
            TextField(
              decoration: const InputDecoration(
                hintText: "Enter Room ID",
              ),
              onSubmitted: (value) {
                Navigator.pop(context); // close the dialog
                createRoom(roomId: value); // join room
              },
            ),
          ])),
        );
      },
    );
  }

  Widget header() {
    Color buttoncolor = const Color.fromARGB(255, 70, 70, 70);

    return Padding(
      key: headerKey,
      padding: const EdgeInsets.symmetric(vertical: 20),
      child: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
        // sub row to group create/join room button and roomuserslist
        Row(children: [
          // create/join room popup
          CircleAvatar(
            backgroundColor: buttoncolor,
            child: PopupMenuButton(
              onSelected: (value) {
                switch (value) {
                  case 'createRoom':
                    return createRoom();
                  case 'joinRoom':
                    return joinRoomForm();
                  default:
                    throw UnimplementedError();
                }
              },
              icon: const Icon(Icons.add, color: Colors.white), // + icon
              tooltip: "Create/Join Room",
              itemBuilder: (context) => const [
                PopupMenuItem(
                  value: "createRoom",
                  child: Text("Create Room"),
                ),
                PopupMenuItem(
                  value: "joinRoom",
                  child: Text("Join Room"),
                ),
              ],
            ),
          ),

          // users list
          Container(
            margin: const EdgeInsets.only(left: 10),
            child: Row(children: [
              ...userList.map(
                (user) {
                  return Container(
                    // each person's name who is in a room
                    height: 50,
                    width: 50,
                    margin: const EdgeInsets.only(left: 4),
                    alignment: Alignment.center,
                    decoration: BoxDecoration(
                      color: Colors
                          .white, // white background // we can also use their profilecolor here
                      borderRadius: BorderRadius.circular(50),
                    ),
                    child: Text(
                      user["username"], // their username
                      style: const TextStyle(
                        color: Colors.black,
                      ),
                    ),
                  );
                },
              ).toList(),
            ]),
          )
        ]),

        // centered Lobby thing
        GestureDetector(
          onTap: toggleContainer,
          onLongPress: () async {
            // long press to copy roomid to clipboard
            // copy to clipboard
            await Clipboard.setData(ClipboardData(text: currRoomId));
            showSnackBar("copied!");
          },
          child: Row(// roomid+dropdown_icon
              children: [
            // roomid
            Text(
              currRoomName.isEmpty ? "Lobby" : currRoomName,
              style: const TextStyle(
                fontSize: 20,
                fontWeight: FontWeight.w500,
                overflow: TextOverflow.ellipsis,
              ),
            ),

            // icon based on if the container is visible or not
            if (containerHeight == 0) ...[
              const Icon(Icons.arrow_drop_down),
            ] else ...[
              const Icon(Icons.arrow_drop_up),
            ]
          ]),
        ),

        // settings button
        CircleAvatar(
          backgroundColor: buttoncolor,
          child: IconButton(
            tooltip:
                "setings", // text which is showed when long pressing or hovering
            onPressed: () {}, // does nothing till now
            icon: const Icon(
              Icons.settings,
              color: Colors.white,
            ),
          ),
        ),
      ]),
    );
  }

  void startSendTouch() {
    // to start the send_touch scheduler

    // endSendTouchTimer.cancel();

    sendTouchScheduler =
        Timer.periodic(Duration(milliseconds: touchRefreshRate), (timer) async {
      // send touch to server
      Map data;
      double staticHeight = getHeaderHeight()! +
          outsidepadding *
              2; // this is the extra static height which change with resize
      double staticWidth = outsidepadding *
          2; // this is the extra static height which change with resize

      // debugPrint("isaAlive:"+channel.isAliave.toString());
      debugPrint("isConnected():" + isConnected().toString());
      // debugPrint("see:"+channel.sink.toString());
      if (!isConnected()) {
        return;
      }
      data = {
        "route": "send_touch",
        "id": 1,
        "type": "enabled", // Whether the vibration is active or not.
        "position": {
          "x": touchX /
              (width -
                  staticWidth), // send ratio x e.g. : x:700, width:800,  then send 0.875
          "y": touchY /
              (height -
                  staticHeight), // send ratio y e.g. : y:400, height:800 then send 0.5
        },
        "color": profileColor, // Hex value. Default: random
        // "intensity"?: 1 // Vibration intensity. Default: 1
      };
      // debugPrint(data['position']['x']);
      // debugPrint(data['position']['y']);
      socket.send(jsonEncode(data));
    });

    // endSendTouchTimer = Timer(const Duration(milliseconds: 1000),() {sendTouchScheduler.cancel(); });
  }

  void stopSendTouch() async {
    // to stop the send_touch scheduler

    sendTouchScheduler.cancel();

    // send one last touch to tell touch is ended
    Map data;
    if (!isConnected()) {
      return;
    }
    data = {
      "route": "send_touch",
      "id": 1,
      "type": "disabled", // Whether the vibration is active or not.
      "position": {
        "x": 0,
        "y": 0,
      },
      "color": profileColor, // Hex value. Default: random
      // "intensity"?: 1 // Vibration intensity. Default: 1
    };

    socket.send(jsonEncode(data));
  }

  Widget buildTouchPoint(
      {required bool visible,
      required double x,
      required double y,
      required double size,
      required Color color}) {
    /*
      bool visible: if the touchpoint is visible
      double x: touchpoint's center x position
      double y: touchpoint's center y position
      double y: touchpoint's center y position
      double size: touchpoint's size
      Color color: touchpoint's color
    */

    color = color.withOpacity(0.5); // make the color a little translucent

    return Visibility(
      visible: visible,
      child: AnimatedPositioned(
        duration: Duration(milliseconds: touchRefreshRate),
        left: x - size / 2,
        top: y - size / 2,
        child: Container(
          width: size,
          height: size,
          decoration: BoxDecoration(
              color: color,
              borderRadius: BorderRadius.circular(50),
              boxShadow: [
                BoxShadow(
                  color: color,
                  blurRadius: 10,
                  spreadRadius: 5,
                ),
              ]),
        ),
      ),
    );
  }

  void detectTouchCollision({
    required double x,
    required double y,
  }) {
    // detect our touch point collision with any other's TouchPoints

    for (Map map in othersTouchPoints.values) {
      double dx = (map["position"]["x"] - x).abs();
      double dy = (map["position"]["y"] - y).abs();
      // debugPrint("x:"+x.toString()+"\ty:"+y.toString());
      // debugPrint("dx:"+dx.toString()+"\tdy:"+dy.toString());
      if (dx <= touchsize && dy <= touchsize) {
        if (hasCollided == false) {
          // Collision Started
          debugPrint("Touch Collision started");

          startHapticFeedback();

          setState(() {
            hasCollided = true;
          });
        }
      } else {
        if (hasCollided == true) {
          // collision ended
          debugPrint("Touch Collision ended");

          endHapticFeedback();

          setState(() {
            hasCollided = false;
          });
        }
        // debugPrint("No Touch Collision.");
      }
    }
  }

  void startHapticFeedback() async {
    if (kIsWeb) {
      // different handler for web
      // showSnackBar("web");
      // off,on,off
      Vibration.vibrate(pattern: [20, 100], repeat: 0); // short fast
      // Vibration.vibrate(pattern:[100, 200, 400],repeat: 0);   // slow
    } else {
      // showSnackBar("mobile");
      if (await Vibration.hasVibrator() == true) {
        // off,on,off
        Vibration.vibrate(pattern: [20, 100], repeat: 0); // short fast
        // Vibration.vibrate(pattern:[100, 200, 400],repeat: 0);   // slow
      }
    }
  }

  void endHapticFeedback() async {
    if (kIsWeb) {
      // different handler for web
      Vibration.cancel();
    } else {
      if (await Vibration.hasVibrator() == true) {
        Vibration.cancel();
      }
    }
  }

  void detectTouchStart(DragStartDetails details) {
    // to detect touch start on screen to start the send_touch scheduler

    // debugPrint(details.localPosition);

    // update our touch point on our screen
    setState(() {
      touchX = details.localPosition.dx;
      touchY = details.localPosition.dy;
      isTouching = true; // show it
    });

    // detect Collision for haptic feedback
    detectTouchCollision(
      x: details.localPosition.dx,
      y: details.localPosition.dy,
    );

    // start send Touch Scheduler
    if (currRoomId.isNotEmpty) {
      // only send touch if we are part of a room
      SchedulerBinding.instance.addPostFrameCallback((_) {
        startSendTouch();
      });
    } else {
      // we are not joined in a room
      // so can't send_touch
    }
  }

  void detectTouchUpdate(DragUpdateDetails details) {
    // to update touchpoint

    // debugPrint(details.localPosition);

    // update our touch point on our screen
    setState(() {
      touchX = details.localPosition.dx;
      touchY = details.localPosition.dy;
    });

    // detect Collision
    detectTouchCollision(
      x: details.localPosition.dx,
      y: details.localPosition.dy,
    );
  }

  void detectTouchEnd(DragEndDetails details) {
    // triggered on touch end

    // update our touch point on our screen
    setState(() {
      touchX = 0;
      touchY = 0;
      isTouching = false; // hide it
    });

    // detect Collision end
    detectTouchCollision(
      x: -1000,
      y: -1000,
    );

    // stop send Touch Scheduler and send stop touch message
    if (currRoomId.isNotEmpty) {
      SchedulerBinding.instance.addPostFrameCallback((_) {
        stopSendTouch();
      });
    } else {
      // can't send_touch end to server cuz we are not in a room
    }
  }

  Widget mainSection() {
    // this is the main touch area

    return Expanded(
      // expanded for it to take up all the available space

      child: GestureDetector(
        onPanStart: (details) {
          detectTouchStart(details); // on touch start
        },
        onPanUpdate: (details) {
          detectTouchUpdate(details); // on touch update
        },
        onPanEnd: (details) {
          detectTouchEnd(details); // on touch end
        },
        child: Container(
          decoration: BoxDecoration(
            color: Colors.grey.shade900,
            borderRadius: BorderRadius.circular(50),
          ),
          clipBehavior: Clip.hardEdge,
          child: Stack(clipBehavior: Clip.hardEdge, children: [
            // render received touch points
            ...othersTouchPoints.values.map<Widget>((map) {
              return buildTouchPoint(
                visible: true,
                x: map['position']['x'],
                y: map['position']['y'],
                size: touchsize,
                color: colorFromHex(map['color'])!,
              );
            }).toList(),

            // our touch point
            buildTouchPoint(
              visible: isTouching,
              x: touchX,
              y: touchY,
              size: touchsize,
              color: colorFromHex(profileColor)!,
            ),
          ]),
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    width = MediaQuery.of(context).size.width; // to get screen width
    height = MediaQuery.of(context).size.height; // to get screen height

    return Scaffold(
      body: Stack(alignment: Alignment.center, children: [
        //outermost background
        Container(
          color: const Color.fromARGB(255, 14, 14, 14),
        ),

        //  header and main touch area
        Padding(
          padding: EdgeInsets.all(outsidepadding),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment
                .stretch, // mainSection expands in height because of this
            children: [
              header(),
              mainSection(),
            ],
          ),
        ),

        //floating Room menu
        Positioned(
          top: 100,
          child: AnimatedContainer(
            duration: const Duration(milliseconds: 100),
            height: containerHeight,
            width: containerWidth,
            clipBehavior: Clip.hardEdge,
            curve: Curves.easeIn,
            decoration: BoxDecoration(
              color: const Color.fromARGB(255, 67, 67, 67),
              borderRadius: BorderRadius.circular(20),
            ),
            child: ListView(children: [
              Container(
                margin: const EdgeInsets.all(20) +
                    const EdgeInsets.symmetric(horizontal: 40),
                child: TextButton(
                  // exit room button
                  onPressed: () {},
                  style: TextButton.styleFrom(
                    backgroundColor: const Color.fromARGB(255, 239, 83, 80),
                    foregroundColor: const Color.fromARGB(255, 255, 255, 255),
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(20)),
                  ),
                  child: const Text("Exit Room"),
                ),
              ),
            ]),
          ),
        ),
      ]),
    );
  }
}