// main window right pane

import 'dart:async';
import 'dart:convert';
import 'dart:io';

import 'package:auto_size_text/auto_size_text.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hbb/consts.dart';
import 'package:flutter_hbb/models/state_model.dart';
import 'package:get/get.dart';
import 'package:url_launcher/url_launcher_string.dart';
import 'package:window_manager/window_manager.dart';
import 'package:flutter_hbb/models/peer_model.dart';

import '../../common.dart';
import '../../common/formatter/id_formatter.dart';
import '../../common/widgets/peer_tab_page.dart';
import '../../common/widgets/autocomplete.dart';
import '../../models/platform_model.dart';
import '../widgets/button.dart';

/// Connection page for connecting to a remote peer.
class ConnectionPage extends StatefulWidget {
  const ConnectionPage({Key? key}) : super(key: key);

  @override
  State<ConnectionPage> createState() => _ConnectionPageState();
}

/// State for the connection page.
class _ConnectionPageState extends State<ConnectionPage>
    with SingleTickerProviderStateMixin, WindowListener {
  /// Controller for the id input bar.
  final _idController = IDTextEditingController();

  Timer? _updateTimer;

  final RxBool _idInputFocused = false.obs;

  var svcStopped = Get.find<RxBool>(tag: 'stop-service');
  var svcIsUsingPublicServer = true.obs;

  bool isWindowMinimized = false;
  List<Peer> peers = [];

  bool isPeersLoading = false;
  bool isPeersLoaded = false;

  @override
  void initState() {
    super.initState();
    if (_idController.text.isEmpty) {
      () async {
        final lastRemoteId = await bind.mainGetLastRemoteId();
        if (lastRemoteId != _idController.id) {
          setState(() {
            _idController.id = lastRemoteId;
          });
        }
      }();
    }
    _updateTimer = periodic_immediate(Duration(seconds: 1), () async {
      updateStatus();
    });
    Get.put<IDTextEditingController>(_idController);
    windowManager.addListener(this);
  }

  @override
  void dispose() {
    _idController.dispose();
    _updateTimer?.cancel();
    windowManager.removeListener(this);
    if (Get.isRegistered<IDTextEditingController>()) {
      Get.delete<IDTextEditingController>();
    }
    if (Get.isRegistered<TextEditingController>()) {
      Get.delete<TextEditingController>();
    }
    super.dispose();
  }

  @override
  void onWindowEvent(String eventName) {
    super.onWindowEvent(eventName);
    if (eventName == 'minimize') {
      isWindowMinimized = true;
    } else if (eventName == 'maximize' || eventName == 'restore') {
      if (isWindowMinimized && Platform.isWindows) {
        // windows can't update when minimized.
        Get.forceAppUpdate();
      }
      isWindowMinimized = false;
    }
  }

  @override
  void onWindowEnterFullScreen() {
    // Remove edge border by setting the value to zero.
    stateGlobal.resizeEdgeSize.value = 0;
  }

  @override
  void onWindowLeaveFullScreen() {
    // Restore edge border to default edge size.
    stateGlobal.resizeEdgeSize.value =
        stateGlobal.isMaximized.isTrue ? kMaximizeEdgeSize : kWindowEdgeSize;
  }

  @override
  void onWindowClose() {
    super.onWindowClose();
    bind.mainOnMainWindowClose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Expanded(
            child: Column(
          children: [
            Row(
              children: [
                Flexible(child: _buildRemoteIDTextField(context)),
              ],
            ).marginOnly(top: 22),
            SizedBox(height: 12),
            Divider().paddingOnly(right: 12),
            Expanded(child: PeerTabPage()),
          ],
        ).paddingOnly(left: 12.0)),
        const Divider(height: 1),
        buildStatus()
      ],
    );
  }

  /// Callback for the connect button.
  /// Connects to the selected peer.
  void onConnect({bool isFileTransfer = false}) {
    var id = _idController.id;
    connect(context, id, isFileTransfer: isFileTransfer);
  }

  Future<void> _fetchPeers() async {
    setState(() {
      isPeersLoading = true;
    });
    await Future.delayed(Duration(milliseconds: 100));
    peers = await getAllPeers();
    setState(() {
      isPeersLoading = false;
      isPeersLoaded = true;
    });
  }

  /// UI for the remote ID TextField.
  /// Search for a peer.
  Widget _buildRemoteIDTextField(BuildContext context) {
    var w = Container(
      width: 320 + 20 * 2,
      padding: const EdgeInsets.fromLTRB(20, 24, 20, 22),
      decoration: BoxDecoration(
          borderRadius: const BorderRadius.all(Radius.circular(13)),
          border: Border.all(color: Theme.of(context).colorScheme.background)),
      child: Ink(
        child: Column(
          children: [
            Row(
              children: [
                Expanded(
                    child: Row(
                  children: [
                    AutoSizeText(
                      translate('Control Remote Desktop'),
                      maxLines: 1,
                      style: Theme.of(context)
                          .textTheme
                          .titleLarge
                          ?.merge(TextStyle(height: 1)),
                    ).marginOnly(right: 4),
                    Tooltip(
                      waitDuration: Duration(milliseconds: 0),
                      message: translate("id_input_tip"),
                      child: Icon(
                        Icons.help_outline_outlined,
                        size: 16,
                        color: Theme.of(context)
                            .textTheme
                            .titleLarge
                            ?.color
                            ?.withOpacity(0.5),
                      ),
                    ),
                  ],
                )),
              ],
            ).marginOnly(bottom: 15),
            Row(
              children: [
                Expanded(
                    child: Autocomplete<Peer>(
                  optionsBuilder: (TextEditingValue textEditingValue) {
                    if (textEditingValue.text == '') {
                      return const Iterable<Peer>.empty();
                    } else if (peers.isEmpty && !isPeersLoaded) {
                      Peer emptyPeer = Peer(
                        id: '',
                        username: '',
                        hostname: '',
                        alias: '',
                        platform: '',
                        tags: [],
                        hash: '',
                        forceAlwaysRelay: false,
                        rdpPort: '',
                        rdpUsername: '',
                        loginName: '',
                      );
                      return [emptyPeer];
                    } else {
                      String textWithoutSpaces =
                          textEditingValue.text.replaceAll(" ", "");
                      if (int.tryParse(textWithoutSpaces) != null) {
                        textEditingValue = TextEditingValue(
                          text: textWithoutSpaces,
                          selection: textEditingValue.selection,
                        );
                      }
                      String textToFind = textEditingValue.text.toLowerCase();

                      return peers
                          .where((peer) =>
                              peer.id.toLowerCase().contains(textToFind) ||
                              peer.username
                                  .toLowerCase()
                                  .contains(textToFind) ||
                              peer.hostname
                                  .toLowerCase()
                                  .contains(textToFind) ||
                              peer.alias.toLowerCase().contains(textToFind))
                          .toList();
                    }
                  },
                  fieldViewBuilder: (
                    BuildContext context,
                    TextEditingController fieldTextEditingController,
                    FocusNode fieldFocusNode,
                    VoidCallback onFieldSubmitted,
                  ) {
                    fieldTextEditingController.text = _idController.text;
                    Get.put<TextEditingController>(fieldTextEditingController);
                    fieldFocusNode.addListener(() async {
                      _idInputFocused.value = fieldFocusNode.hasFocus;
                      if (fieldFocusNode.hasFocus && !isPeersLoading) {
                        _fetchPeers();
                      }
                    });
                    final textLength =
                        fieldTextEditingController.value.text.length;
                    // select all to facilitate removing text, just following the behavior of address input of chrome
                    fieldTextEditingController.selection =
                        TextSelection(baseOffset: 0, extentOffset: textLength);
                    return Obx(() => TextField(
                          autocorrect: false,
                          enableSuggestions: false,
                          keyboardType: TextInputType.visiblePassword,
                          focusNode: fieldFocusNode,
                          style: const TextStyle(
                            fontFamily: 'WorkSans',
                            fontSize: 22,
                            height: 1.4,
                          ),
                          maxLines: 1,
                          cursorColor:
                              Theme.of(context).textTheme.titleLarge?.color,
                          decoration: InputDecoration(
                              filled: false,
                              counterText: '',
                              hintText: _idInputFocused.value
                                  ? null
                                  : translate('Enter Remote ID'),
                              contentPadding: const EdgeInsets.symmetric(
                                  horizontal: 15, vertical: 13)),
                          controller: fieldTextEditingController,
                          inputFormatters: [IDTextInputFormatter()],
                          onChanged: (v) {
                            _idController.id = v;
                          },
                        ));
                  },
                  onSelected: (option) {
                    setState(() {
                      _idController.id = option.id;
                      FocusScope.of(context).unfocus();
                    });
                  },
                  optionsViewBuilder: (BuildContext context,
                      AutocompleteOnSelected<Peer> onSelected,
                      Iterable<Peer> options) {
                    double maxHeight = options.length * 50;
                    if (options.length == 1) {
                      maxHeight = 52;
                    } else if (options.length == 3) {
                      maxHeight = 146;
                    } else if (options.length == 4) {
                      maxHeight = 193;
                    }
                    maxHeight = maxHeight.clamp(0, 200);

                    return Align(
                      alignment: Alignment.topLeft,
                      child: Container(
                          decoration: BoxDecoration(
                            boxShadow: [
                              BoxShadow(
                                color: Colors.black.withOpacity(0.3),
                                blurRadius: 5,
                                spreadRadius: 1,
                              ),
                            ],
                          ),
                          child: ClipRRect(
                              borderRadius: BorderRadius.circular(5),
                              child: Material(
                                elevation: 4,
                                child: ConstrainedBox(
                                  constraints: BoxConstraints(
                                    maxHeight: maxHeight,
                                    maxWidth: 319,
                                  ),
                                  child: peers.isEmpty && isPeersLoading
                                      ? Container(
                                          height: 80,
                                          child: Center(
                                            child: CircularProgressIndicator(
                                              strokeWidth: 2,
                                            ),
                                          ))
                                      : Padding(
                                          padding:
                                              const EdgeInsets.only(top: 5),
                                          child: ListView(
                                            children: options
                                                .map((peer) =>
                                                    AutocompletePeerTile(
                                                        onSelect: () =>
                                                            onSelected(peer),
                                                        peer: peer))
                                                .toList(),
                                          ),
                                        ),
                                ),
                              ))),
                    );
                  },
                )),
              ],
            ),
            Padding(
              padding: const EdgeInsets.only(top: 13.0),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  Button(
                    isOutline: true,
                    onTap: () => onConnect(isFileTransfer: true),
                    text: "Transfer file",
                  ),
                  const SizedBox(
                    width: 17,
                  ),
                  Button(onTap: onConnect, text: "Connect"),
                ],
              ),
            )
          ],
        ),
      ),
    );
    return Container(
        constraints: const BoxConstraints(maxWidth: 600), child: w);
  }

  Widget buildStatus() {
    final em = 14.0;
    return Container(
      height: 3 * em,
      child: Obx(() => Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Container(
                height: 8,
                width: 8,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(4),
                  color: svcStopped.value ||
                          stateGlobal.svcStatus.value == SvcStatus.connecting
                      ? kColorWarn
                      : (stateGlobal.svcStatus.value == SvcStatus.ready
                          ? Color.fromARGB(255, 50, 190, 166)
                          : Color.fromARGB(255, 224, 79, 95)),
                ),
              ).marginSymmetric(horizontal: em),
              Text(
                  svcStopped.value
                      ? translate("Service is not running")
                      : stateGlobal.svcStatus.value == SvcStatus.connecting
                          ? translate("connecting_status")
                          : stateGlobal.svcStatus.value == SvcStatus.notReady
                              ? translate("not_ready_status")
                              : translate('Ready'),
                  style: TextStyle(fontSize: em)),
              // stop
              Offstage(
                offstage: !svcStopped.value,
                child: InkWell(
                        onTap: () async {
                          await start_service(true);
                        },
                        child: Text(translate("Start service"),
                            style: TextStyle(
                                decoration: TextDecoration.underline,
                                fontSize: em)))
                    .marginOnly(left: em),
              ),
              // ready && public
              Flexible(
                child: Offstage(
                  offstage: !(!svcStopped.value &&
                      stateGlobal.svcStatus.value == SvcStatus.ready &&
                      svcIsUsingPublicServer.value),
                  child: Row(
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: [
                      Text(', ', style: TextStyle(fontSize: em)),
                      Flexible(
                        child: InkWell(
                          onTap: onUsePublicServerGuide,
                          child: Row(
                            children: [
                              Flexible(
                                child: Text(
                                  translate('setup_server_tip'),
                                  style: TextStyle(
                                      decoration: TextDecoration.underline,
                                      fontSize: em),
                                ),
                              ),
                            ],
                          ),
                        ),
                      )
                    ],
                  ),
                ),
              )
            ],
          )),
    );
  }

  void onUsePublicServerGuide() {
    const url = "https://rustdesk.com/blog/id-relay-set/";
    canLaunchUrlString(url).then((can) {
      if (can) {
        launchUrlString(url);
      }
    });
  }

  updateStatus() async {
    final status =
        jsonDecode(await bind.mainGetConnectStatus()) as Map<String, dynamic>;
    final statusNum = status['status_num'] as int;
    final preStatus = stateGlobal.svcStatus.value;
    if (statusNum == 0) {
      stateGlobal.svcStatus.value = SvcStatus.connecting;
    } else if (statusNum == -1) {
      stateGlobal.svcStatus.value = SvcStatus.notReady;
    } else if (statusNum == 1) {
      stateGlobal.svcStatus.value = SvcStatus.ready;
      if (preStatus != SvcStatus.ready) {
        gFFI.userModel.refreshCurrentUser();
      }
    } else {
      stateGlobal.svcStatus.value = SvcStatus.notReady;
    }
    svcIsUsingPublicServer.value = await bind.mainIsUsingPublicServer();
  }
}