import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';

import '../../common.dart';
import '../../models/model.dart';
import '../../models/platform_model.dart';

void clientClose(String id, OverlayDialogManager dialogManager) {
  msgBox(id, 'info', 'Close', 'Are you sure to close the connection?', '',
      dialogManager);
}

abstract class ValidationRule {
  String get name;
  bool validate(String value);
}

class LengthRangeValidationRule extends ValidationRule {
  final int _min;
  final int _max;

  LengthRangeValidationRule(this._min, this._max);

  @override
  String get name => translate('length %min% to %max%')
      .replaceAll('%min%', _min.toString())
      .replaceAll('%max%', _max.toString());

  @override
  bool validate(String value) {
    return value.length >= _min && value.length <= _max;
  }
}

class RegexValidationRule extends ValidationRule {
  final String _name;
  final RegExp _regex;

  RegexValidationRule(this._name, this._regex);

  @override
  String get name => translate(_name);

  @override
  bool validate(String value) {
    return value.isNotEmpty ? value.contains(_regex) : false;
  }
}

void changeIdDialog() {
  var newId = "";
  var msg = "";
  var isInProgress = false;
  TextEditingController controller = TextEditingController();
  final RxString rxId = controller.text.trim().obs;

  final rules = [
    RegexValidationRule('starts with a letter', RegExp(r'^[a-zA-Z]')),
    LengthRangeValidationRule(6, 16),
    RegexValidationRule('allowed characters', RegExp(r'^\w*$'))
  ];

  gFFI.dialogManager.show((setState, close) {
    submit() async {
      debugPrint("onSubmit");
      newId = controller.text.trim();

      final Iterable violations = rules.where((r) => !r.validate(newId));
      if (violations.isNotEmpty) {
        setState(() {
          msg = isDesktop
              ? '${translate('Prompt')}:  ${violations.map((r) => r.name).join(', ')}'
              : violations.map((r) => r.name).join(', ');
        });
        return;
      }

      setState(() {
        msg = "";
        isInProgress = true;
        bind.mainChangeId(newId: newId);
      });

      var status = await bind.mainGetAsyncStatus();
      while (status == " ") {
        await Future.delayed(const Duration(milliseconds: 100));
        status = await bind.mainGetAsyncStatus();
      }
      if (status.isEmpty) {
        // ok
        close();
        return;
      }
      setState(() {
        isInProgress = false;
        msg = isDesktop
            ? '${translate('Prompt')}: ${translate(status)}'
            : translate(status);
      });
    }

    return CustomAlertDialog(
      title: Text(translate("Change ID")),
      content: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(translate("id_change_tip")),
          const SizedBox(
            height: 12.0,
          ),
          TextField(
            decoration: InputDecoration(
                labelText: translate('Your new ID'),
                errorText: msg.isEmpty ? null : translate(msg),
                suffixText: '${rxId.value.length}/16',
                suffixStyle: const TextStyle(fontSize: 12, color: Colors.grey)),
            inputFormatters: [
              LengthLimitingTextInputFormatter(16),
              // FilteringTextInputFormatter(RegExp(r"[a-zA-z][a-zA-z0-9\_]*"), allow: true)
            ],
            controller: controller,
            autofocus: true,
            onChanged: (value) {
              setState(() {
                rxId.value = value.trim();
                msg = '';
              });
            },
          ),
          const SizedBox(
            height: 8.0,
          ),
          isDesktop
              ? Obx(() => Wrap(
                    runSpacing: 8,
                    spacing: 4,
                    children: rules.map((e) {
                      var checked = e.validate(rxId.value);
                      return Chip(
                          label: Text(
                            e.name,
                            style: TextStyle(
                                color: checked
                                    ? const Color(0xFF0A9471)
                                    : Color.fromARGB(255, 198, 86, 157)),
                          ),
                          backgroundColor: checked
                              ? const Color(0xFFD0F7ED)
                              : Color.fromARGB(255, 247, 205, 232));
                    }).toList(),
                  )).marginOnly(bottom: 8)
              : SizedBox.shrink(),
          Offstage(
              offstage: !isInProgress, child: const LinearProgressIndicator())
        ],
      ),
      actions: [
        dialogButton("Cancel", onPressed: close, isOutline: true),
        dialogButton("OK", onPressed: submit),
      ],
      onSubmit: submit,
      onCancel: close,
    );
  });
}

void changeWhiteList({Function()? callback}) async {
  var newWhiteList = (await bind.mainGetOption(key: 'whitelist')).split(',');
  var newWhiteListField = newWhiteList.join('\n');
  var controller = TextEditingController(text: newWhiteListField);
  var msg = "";
  var isInProgress = false;
  gFFI.dialogManager.show((setState, close) {
    return CustomAlertDialog(
      title: Text(translate("IP Whitelisting")),
      content: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(translate("whitelist_sep")),
          const SizedBox(
            height: 8.0,
          ),
          Row(
            children: [
              Expanded(
                child: TextField(
                    maxLines: null,
                    decoration: InputDecoration(
                      errorText: msg.isEmpty ? null : translate(msg),
                    ),
                    controller: controller,
                    autofocus: true),
              ),
            ],
          ),
          const SizedBox(
            height: 4.0,
          ),
          Offstage(
              offstage: !isInProgress, child: const LinearProgressIndicator())
        ],
      ),
      actions: [
        dialogButton("Cancel", onPressed: close, isOutline: true),
        dialogButton("Clear", onPressed: () async {
          await bind.mainSetOption(key: 'whitelist', value: '');
          callback?.call();
          close();
        }, isOutline: true),
        dialogButton(
          "OK",
          onPressed: () async {
            setState(() {
              msg = "";
              isInProgress = true;
            });
            newWhiteListField = controller.text.trim();
            var newWhiteList = "";
            if (newWhiteListField.isEmpty) {
              // pass
            } else {
              final ips = newWhiteListField.trim().split(RegExp(r"[\s,;\n]+"));
              // test ip
              final ipMatch = RegExp(
                  r"^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)(\/([1-9]|[1-2][0-9]|3[0-2])){0,1}$");
              final ipv6Match = RegExp(
                  r"^(((?:[0-9A-Fa-f]{1,4}))*((?::[0-9A-Fa-f]{1,4}))*::((?:[0-9A-Fa-f]{1,4}))*((?::[0-9A-Fa-f]{1,4}))*|((?:[0-9A-Fa-f]{1,4}))((?::[0-9A-Fa-f]{1,4})){7})(\/([1-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8])){0,1}$");
              for (final ip in ips) {
                if (!ipMatch.hasMatch(ip) && !ipv6Match.hasMatch(ip)) {
                  msg = "${translate("Invalid IP")} $ip";
                  setState(() {
                    isInProgress = false;
                  });
                  return;
                }
              }
              newWhiteList = ips.join(',');
            }
            await bind.mainSetOption(key: 'whitelist', value: newWhiteList);
            callback?.call();
            close();
          },
        ),
      ],
      onCancel: close,
    );
  });
}

Future<String> changeDirectAccessPort(
    String currentIP, String currentPort) async {
  final controller = TextEditingController(text: currentPort);
  await gFFI.dialogManager.show((setState, close) {
    return CustomAlertDialog(
      title: Text(translate("Change Local Port")),
      content: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const SizedBox(height: 8.0),
          Row(
            children: [
              Expanded(
                child: TextField(
                    maxLines: null,
                    keyboardType: TextInputType.number,
                    decoration: InputDecoration(
                        hintText: '21118',
                        isCollapsed: true,
                        prefix: Text('$currentIP : '),
                        suffix: IconButton(
                            padding: EdgeInsets.zero,
                            icon: const Icon(Icons.clear, size: 16),
                            onPressed: () => controller.clear())),
                    inputFormatters: [
                      FilteringTextInputFormatter.allow(RegExp(
                          r'^([0-9]|[1-9]\d|[1-9]\d{2}|[1-9]\d{3}|[1-5]\d{4}|6[0-4]\d{3}|65[0-4]\d{2}|655[0-2]\d|6553[0-5])$')),
                    ],
                    controller: controller,
                    autofocus: true),
              ),
            ],
          ),
        ],
      ),
      actions: [
        dialogButton("Cancel", onPressed: close, isOutline: true),
        dialogButton("OK", onPressed: () async {
          await bind.mainSetOption(
              key: 'direct-access-port', value: controller.text);
          close();
        }),
      ],
      onCancel: close,
    );
  });
  return controller.text;
}

class DialogTextField extends StatelessWidget {
  final String title;
  final String? hintText;
  final bool obscureText;
  final String? errorText;
  final String? helperText;
  final Widget? prefixIcon;
  final Widget? suffixIcon;
  final TextEditingController controller;
  final FocusNode? focusNode;

  static const kUsernameTitle = 'Username';
  static const kUsernameIcon = Icon(Icons.account_circle_outlined);
  static const kPasswordTitle = 'Password';
  static const kPasswordIcon = Icon(Icons.lock_outline);

  DialogTextField(
      {Key? key,
      this.focusNode,
      this.obscureText = false,
      this.errorText,
      this.helperText,
      this.prefixIcon,
      this.suffixIcon,
      this.hintText,
      required this.title,
      required this.controller})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Expanded(
          child: TextField(
            decoration: InputDecoration(
              labelText: title,
              hintText: hintText,
              prefixIcon: prefixIcon,
              suffixIcon: suffixIcon,
              helperText: helperText,
              helperMaxLines: 8,
              errorText: errorText,
            ),
            controller: controller,
            focusNode: focusNode,
            autofocus: true,
            obscureText: obscureText,
          ),
        ),
      ],
    ).paddingSymmetric(vertical: 4.0);
  }
}

class PasswordWidget extends StatefulWidget {
  PasswordWidget({
    Key? key,
    required this.controller,
    this.autoFocus = true,
    this.hintText,
    this.errorText,
  }) : super(key: key);

  final TextEditingController controller;
  final bool autoFocus;
  final String? hintText;
  final String? errorText;

  @override
  State<PasswordWidget> createState() => _PasswordWidgetState();
}

class _PasswordWidgetState extends State<PasswordWidget> {
  bool _passwordVisible = false;
  final _focusNode = FocusNode();
  Timer? _timer;

  @override
  void initState() {
    super.initState();
    if (widget.autoFocus) {
      _timer =
          Timer(Duration(milliseconds: 50), () => _focusNode.requestFocus());
    }
  }

  @override
  void dispose() {
    _timer?.cancel();
    _focusNode.unfocus();
    _focusNode.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return DialogTextField(
      title: translate(DialogTextField.kPasswordTitle),
      hintText: translate(widget.hintText ?? 'Enter your password'),
      controller: widget.controller,
      prefixIcon: DialogTextField.kPasswordIcon,
      suffixIcon: IconButton(
        icon: Icon(
            // Based on passwordVisible state choose the icon
            _passwordVisible ? Icons.visibility : Icons.visibility_off,
            color: MyTheme.lightTheme.primaryColor),
        onPressed: () {
          // Update the state i.e. toggle the state of passwordVisible variable
          setState(() {
            _passwordVisible = !_passwordVisible;
          });
        },
      ),
      obscureText: !_passwordVisible,
      errorText: widget.errorText,
      focusNode: _focusNode,
    );
  }
}

void wrongPasswordDialog(
    String id, OverlayDialogManager dialogManager, type, title, text) {
  dialogManager.dismissAll();
  dialogManager.show((setState, close) {
    cancel() {
      close();
      closeConnection();
    }

    submit() {
      enterPasswordDialog(id, dialogManager);
    }

    return CustomAlertDialog(
        title: null,
        content: msgboxContent(type, title, text),
        onSubmit: submit,
        onCancel: cancel,
        actions: [
          dialogButton(
            'Cancel',
            onPressed: cancel,
            isOutline: true,
          ),
          dialogButton(
            'Retry',
            onPressed: submit,
          ),
        ]);
  });
}

void enterPasswordDialog(String id, OverlayDialogManager dialogManager) async {
  await _connectDialog(
    id,
    dialogManager,
    peerPasswordController: TextEditingController(),
  );
}

void enterUserLoginDialog(String id, OverlayDialogManager dialogManager) async {
  await _connectDialog(
    id,
    dialogManager,
    usernameController: TextEditingController(),
    passwordController: TextEditingController(),
  );
}

void enterUserLoginAndPasswordDialog(
    String id, OverlayDialogManager dialogManager) async {
  await _connectDialog(
    id,
    dialogManager,
    usernameController: TextEditingController(),
    passwordController: TextEditingController(),
    peerPasswordController: TextEditingController(),
  );
}

_connectDialog(
  String id,
  OverlayDialogManager dialogManager, {
  TextEditingController? usernameController,
  TextEditingController? passwordController,
  TextEditingController? peerPasswordController,
}) async {
  var remember = await bind.sessionGetRemember(id: id) ?? false;
  dialogManager.dismissAll();
  dialogManager.show((setState, close) {
    cancel() {
      close();
      closeConnection();
    }

    submit() {
      // to-do:
      // username and password are about remote OS account.
      // If the remote side is headless.
      // The client side should login to remote OS account, to enable X desktop session.
      // `username` and `password` will be used in the near future.
      final username = usernameController?.text.trim() ?? '';
      final password = passwordController?.text.trim() ?? '';
      final peerPassword = peerPasswordController?.text.trim() ?? '';
      if (peerPasswordController != null && peerPassword.isEmpty) return;
      gFFI.login(
        // username,
        // password,
        id,
        peerPassword,
        remember,
      );
      close();
      dialogManager.showLoading(translate('Logging in...'),
          onCancel: closeConnection);
    }

    return CustomAlertDialog(
      title: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.password_rounded, color: MyTheme.accent),
          (usernameController == null
                  ? Text(translate('Password Required'))
                  : Tooltip(
                      message: translate('login_linux_tooltip_tip'),
                      child: Text(translate('login_linux_tip')),
                    ))
              .paddingOnly(left: 10),
        ],
      ),
      content: Column(mainAxisSize: MainAxisSize.min, children: [
        usernameController == null
            ? Offstage()
            : DialogTextField(
                title: translate(DialogTextField.kUsernameTitle),
                controller: usernameController,
                prefixIcon: DialogTextField.kUsernameIcon,
                errorText: null,
              ),
        passwordController == null
            ? Offstage()
            : PasswordWidget(
                controller: passwordController,
                autoFocus: false,
              ),
        usernameController == null || peerPasswordController == null
            ? Offstage()
            : const Divider(),
        peerPasswordController == null
            ? Offstage()
            : PasswordWidget(
                controller: peerPasswordController,
                autoFocus: usernameController == null,
                hintText: 'enter_rustdesk_passwd_tip',
              ),
        peerPasswordController == null
            ? Offstage()
            : CheckboxListTile(
                contentPadding: const EdgeInsets.all(0),
                dense: true,
                controlAffinity: ListTileControlAffinity.leading,
                title: Text(
                  translate('remember_rustdesk_passwd_tip'),
                ),
                value: remember,
                onChanged: (v) {
                  if (v != null) {
                    setState(() => remember = v);
                  }
                },
              ),
      ]),
      actions: [
        dialogButton(
          'Cancel',
          icon: Icon(Icons.close_rounded),
          onPressed: cancel,
          isOutline: true,
        ),
        dialogButton(
          'OK',
          icon: Icon(Icons.done_rounded),
          onPressed: submit,
        ),
      ],
      onSubmit: submit,
      onCancel: cancel,
    );
  });
}

void showWaitUacDialog(
    String id, OverlayDialogManager dialogManager, String type) {
  dialogManager.dismissAll();
  dialogManager.show(
      tag: '$id-wait-uac',
      (setState, close) => CustomAlertDialog(
            title: null,
            content: msgboxContent(type, 'Wait', 'wait_accept_uac_tip'),
          ));
}

// Another username && password dialog?
void showRequestElevationDialog(String id, OverlayDialogManager dialogManager) {
  RxString groupValue = ''.obs;
  RxString errUser = ''.obs;
  RxString errPwd = ''.obs;
  TextEditingController userController = TextEditingController();
  TextEditingController pwdController = TextEditingController();

  void onRadioChanged(String? value) {
    if (value != null) {
      groupValue.value = value;
    }
  }

  const minTextStyle = TextStyle(fontSize: 14);

  var content = Obx(() => Column(children: [
        Row(
          children: [
            Radio(
                value: '',
                groupValue: groupValue.value,
                onChanged: onRadioChanged),
            Expanded(
                child:
                    Text(translate('Ask the remote user for authentication'))),
          ],
        ),
        Align(
          alignment: Alignment.centerLeft,
          child: Text(
                  translate(
                      'Choose this if the remote account is administrator'),
                  style: TextStyle(fontSize: 13))
              .marginOnly(left: 40),
        ).marginOnly(bottom: 15),
        Row(
          children: [
            Radio(
                value: 'logon',
                groupValue: groupValue.value,
                onChanged: onRadioChanged),
            Expanded(
              child: Text(translate(
                  'Transmit the username and password of administrator')),
            )
          ],
        ),
        Row(
          children: [
            Expanded(
                flex: 1,
                child: Text(
                  '${translate('Username')}:',
                  style: minTextStyle,
                ).marginOnly(right: 10)),
            Expanded(
              flex: 3,
              child: TextField(
                controller: userController,
                style: minTextStyle,
                decoration: InputDecoration(
                    isDense: true,
                    contentPadding: EdgeInsets.symmetric(vertical: 15),
                    hintText: translate('eg: admin'),
                    errorText: errUser.isEmpty ? null : errUser.value),
                onChanged: (s) {
                  if (s.isNotEmpty) {
                    errUser.value = '';
                  }
                },
              ),
            )
          ],
        ).marginOnly(left: 40),
        Row(
          children: [
            Expanded(
                flex: 1,
                child: Text(
                  '${translate('Password')}:',
                  style: minTextStyle,
                ).marginOnly(right: 10)),
            Expanded(
              flex: 3,
              child: TextField(
                controller: pwdController,
                obscureText: true,
                style: minTextStyle,
                decoration: InputDecoration(
                    isDense: true,
                    contentPadding: EdgeInsets.symmetric(vertical: 15),
                    errorText: errPwd.isEmpty ? null : errPwd.value),
                onChanged: (s) {
                  if (s.isNotEmpty) {
                    errPwd.value = '';
                  }
                },
              ),
            ),
          ],
        ).marginOnly(left: 40),
        Align(
            alignment: Alignment.centerLeft,
            child: Text(translate('still_click_uac_tip'),
                    style: TextStyle(fontSize: 13, fontWeight: FontWeight.bold))
                .marginOnly(top: 20)),
      ]));

  dialogManager.dismissAll();
  dialogManager.show(tag: '$id-request-elevation', (setState, close) {
    void submit() {
      if (groupValue.value == 'logon') {
        if (userController.text.isEmpty) {
          errUser.value = translate('Empty Username');
          return;
        }
        if (pwdController.text.isEmpty) {
          errPwd.value = translate('Empty Password');
          return;
        }
        bind.sessionElevateWithLogon(
            id: id,
            username: userController.text,
            password: pwdController.text);
      } else {
        bind.sessionElevateDirect(id: id);
      }
    }

    return CustomAlertDialog(
      title: Text(translate('Request Elevation')),
      content: content,
      actions: [
        dialogButton('Cancel', onPressed: close, isOutline: true),
        dialogButton('OK', onPressed: submit),
      ],
      onSubmit: submit,
      onCancel: close,
    );
  });
}

void showOnBlockDialog(
  String id,
  String type,
  String title,
  String text,
  OverlayDialogManager dialogManager,
) {
  if (dialogManager.existing('$id-wait-uac') ||
      dialogManager.existing('$id-request-elevation')) {
    return;
  }
  dialogManager.show(tag: '$id-$type', (setState, close) {
    void submit() {
      close();
      showRequestElevationDialog(id, dialogManager);
    }

    return CustomAlertDialog(
      title: null,
      content: msgboxContent(type, title,
          "${translate(text)}${type.contains('uac') ? '\n' : '\n\n'}${translate('request_elevation_tip')}"),
      actions: [
        dialogButton('Wait', onPressed: close, isOutline: true),
        dialogButton('Request Elevation', onPressed: submit),
      ],
      onSubmit: submit,
      onCancel: close,
    );
  });
}

void showElevationError(String id, String type, String title, String text,
    OverlayDialogManager dialogManager) {
  dialogManager.show(tag: '$id-$type', (setState, close) {
    void submit() {
      close();
      showRequestElevationDialog(id, dialogManager);
    }

    return CustomAlertDialog(
      title: null,
      content: msgboxContent(type, title, text),
      actions: [
        dialogButton('Cancel', onPressed: () {
          close();
        }, isOutline: true),
        dialogButton('Retry', onPressed: submit),
      ],
      onSubmit: submit,
      onCancel: close,
    );
  });
}

void showWaitAcceptDialog(String id, String type, String title, String text,
    OverlayDialogManager dialogManager) {
  dialogManager.dismissAll();
  dialogManager.show((setState, close) {
    onCancel() {
      closeConnection();
    }

    return CustomAlertDialog(
      title: null,
      content: msgboxContent(type, title, text),
      actions: [
        dialogButton('Cancel', onPressed: onCancel, isOutline: true),
      ],
      onCancel: onCancel,
    );
  });
}

void showRestartRemoteDevice(
    PeerInfo pi, String id, OverlayDialogManager dialogManager) async {
  final res =
      await dialogManager.show<bool>((setState, close) => CustomAlertDialog(
            title: Row(children: [
              Icon(Icons.warning_rounded, color: Colors.redAccent, size: 28),
              Text(translate("Restart Remote Device")).paddingOnly(left: 10),
            ]),
            content: Text(
                "${translate('Are you sure you want to restart')} \n${pi.username}@${pi.hostname}($id) ?"),
            actions: [
              dialogButton(
                "Cancel",
                icon: Icon(Icons.close_rounded),
                onPressed: close,
                isOutline: true,
              ),
              dialogButton(
                "OK",
                icon: Icon(Icons.done_rounded),
                onPressed: () => close(true),
              ),
            ],
            onCancel: close,
            onSubmit: () => close(true),
          ));
  if (res == true) bind.sessionRestartRemoteDevice(id: id);
}