import 'dart:convert';
import 'dart:developer';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:http/http.dart' as http;
import 'package:mchess/api/register.dart';
import 'package:mchess/connection/ws_connection.dart';
import 'package:mchess/connection_cubit/connection_cubit.dart';
import 'package:mchess/pages/chess_game.dart';
import 'package:mchess/utils/config.dart' as config;

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

  @override
  State<LobbySelector> createState() => _LobbySelectorState();
}

class _LobbySelectorState extends State<LobbySelector> {
  final buttonStyle = const ButtonStyle();
  final phraseController = TextEditingController();
  late Future<PlayerInfo?> joinGameFuture;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: () => buildJoinOrHostDialog(context),
              child: const Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Icon(Icons.lock),
                  SizedBox(
                    width: 10,
                  ),
                  Text('Private game')
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> buildJoinOrHostDialog(BuildContext context) {
    //TODO: find a better place to disconnect old websocket connection
    ServerConnection.getInstance().disconnectExistingConnection();

    return showDialog<void>(
      context: context,
      builder: (BuildContext context) {
        return Scaffold(
          backgroundColor: Colors.transparent,
          body: AlertDialog(
            title: const Text('Host or join?'),
            actions: <Widget>[
              TextButton(
                child: const Text('Cancel'),
                onPressed: () => context.pop(),
              ),
              TextButton(
                  child: const Text('Host'),
                  onPressed: () {
                    context.pop(); //close dialog before going to host
                    context.goNamed('host');
                  }),
              TextButton(
                child: const Text('Join'),
                onPressed: () {
                  context.pop(); //close dialog before going to next dialog
                  buildEnterPassphraseDialog(context);
                },
              ),
            ],
          ),
        );
      },
    );
  }

  Future<void> buildEnterPassphraseDialog(BuildContext context) {
    return showDialog<void>(
      context: context,
      builder: (BuildContext context) {
        return ScaffoldMessenger(
          child: Builder(builder: (builderContext) {
            return Scaffold(
              backgroundColor: Colors.transparent,
              body: AlertDialog(
                title: const Text('Enter the passphrase here:'),
                content: TextField(
                  controller: phraseController,
                  onSubmitted: (val) {
                    submitPassphrase(builderContext);
                  },
                  decoration: InputDecoration(
                      hintText: 'Enter passphrase here',
                      suffixIcon: IconButton(
                        onPressed: () {
                          submitPassphrase(builderContext);
                        },
                        icon: const Icon(Icons.check),
                      )),
                ),
                actions: <Widget>[
                  TextButton(
                    child: const Text('Cancel'),
                    onPressed: () {
                      builderContext.pop();
                    },
                  ),
                ],
              ),
            );
          }),
        );
      },
    );
  }

  void submitPassphrase(BuildContext ctx) {
    joinGameFuture = joinPrivateGame(ctx);
    joinGameFuture.then((value) {
      if (value != null) {
        phraseController.clear();
        ctx.pop();
        switchToGame(value);
      }
    });
  }

  void switchToGame(PlayerInfo info) {
    var chessGameArgs = ChessGameArguments(
        lobbyID: info.lobbyID!,
        playerID: info.playerID!,
        passphrase: info.passphrase);

    ConnectionCubit.getInstance().connect(
      info.playerID!.uuid,
      info.lobbyID!.uuid,
      info.passphrase,
    );

    if (!chessGameArgs.isValid()) {
      context.goNamed('lobbySelector');
      const snackBar = SnackBar(
        backgroundColor: Colors.amberAccent,
        content: Text("Game information is corrupted"),
      );
      ScaffoldMessenger.of(context).clearSnackBars();
      ScaffoldMessenger.of(context).showSnackBar(snackBar);

      return;
    }

    context.goNamed('game', extra: chessGameArgs);
  }

  Future<PlayerInfo?> joinPrivateGame(BuildContext context) async {
    http.Response response;

    var existingInfo = await PlayerInfo.get();

    log("lobbyID: ${existingInfo?.lobbyID} and playerID: ${existingInfo?.playerID} and passphrase: ${existingInfo?.passphrase}");

    PlayerInfo info;
    if (existingInfo?.passphrase == phraseController.text) {
      // We have player info for this exact passphrase
      info = PlayerInfo(
          playerID: existingInfo?.playerID,
          lobbyID: existingInfo?.lobbyID,
          passphrase: phraseController.text);
    } else {
      info = PlayerInfo(
          playerID: null, lobbyID: null, passphrase: phraseController.text);
    }

    var decodedInfo = jsonEncode(info);
    log("decodedInfo: $decodedInfo");

    try {
      response = await http.post(Uri.parse(config.getJoinURL()),
          body: decodedInfo, headers: {"Accept": "application/json"});
    } catch (e) {
      log(e.toString());

      if (!context.mounted) return null;

      const snackBar = SnackBar(
        backgroundColor: Colors.amberAccent,
        content: Text("mChess server is not responding. Try again or give up"),
      );
      ScaffoldMessenger.of(context).clearSnackBars();
      ScaffoldMessenger.of(context).showSnackBar(snackBar);
      return null;
    }

    if (response.statusCode == HttpStatus.notFound) {
      const snackBar = SnackBar(
        backgroundColor: Colors.amberAccent,
        content: Text("Passphrase could not be found."),
      );

      if (!context.mounted) return null;

      ScaffoldMessenger.of(context).clearSnackBars();
      ScaffoldMessenger.of(context).showSnackBar(snackBar);
      return null;
    }

    if (response.statusCode == HttpStatus.ok) {
      var info = PlayerInfo.fromJson(jsonDecode(response.body));
      info.store();
      log('Player info received from server: ');
      log('lobbyID: ${info.lobbyID}');
      log('playerID: ${info.playerID}');
      log('passphrase: ${info.passphrase}');

      return info;
    }

    return null;
  }
}