/*
 * Copyright (C) 2022-2024 Yubico.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:material_symbols_icons/symbols.dart';

import '../../app/message.dart';
import '../../app/models.dart';
import '../../app/state.dart';
import '../../exception/cancellation_exception.dart';
import '../../management/models.dart';
import '../../widgets/app_input_decoration.dart';
import '../../widgets/app_text_field.dart';
import '../../widgets/responsive_dialog.dart';
import '../keys.dart' as keys;
import '../models.dart';
import '../state.dart';

class ManagePasswordDialog extends ConsumerStatefulWidget {
  final DevicePath path;
  final OathState state;

  const ManagePasswordDialog(this.path, this.state, {super.key});

  @override
  ConsumerState<ConsumerStatefulWidget> createState() =>
      _ManagePasswordDialogState();
}

class _ManagePasswordDialogState extends ConsumerState<ManagePasswordDialog> {
  final _currentPasswordController = TextEditingController();
  final _currentPasswordFocus = FocusNode();
  final _newPasswordFocus = FocusNode();
  final _confirmPasswordFocus = FocusNode();
  String _newPassword = '';
  String _confirmPassword = '';
  bool _currentIsWrong = false;
  bool _isObscureCurrent = true;
  bool _isObscureNew = true;
  bool _isObscureConfirm = true;

  @override
  void dispose() {
    _currentPasswordController.dispose();
    _currentPasswordFocus.dispose();
    _newPasswordFocus.dispose();
    _confirmPasswordFocus.dispose();
    super.dispose();
  }

  void _removeFocus() {
    _currentPasswordFocus.unfocus();
    _newPasswordFocus.unfocus();
    _confirmPasswordFocus.unfocus();
  }

  _submit() async {
    _removeFocus();

    try {
      final result = await ref
          .read(oathStateProvider(widget.path).notifier)
          .setPassword(_currentPasswordController.text, _newPassword);
      if (result) {
        if (mounted) {
          await ref.read(withContextProvider)((context) async {
            Navigator.of(context).pop();
            showMessage(context, AppLocalizations.of(context)!.s_password_set);
          });
        }
      } else {
        _currentPasswordController.selection = TextSelection(
            baseOffset: 0,
            extentOffset: _currentPasswordController.text.length);
        _currentPasswordFocus.requestFocus();
        setState(() {
          _currentIsWrong = true;
        });
      }
    } on CancellationException catch (_) {
      // ignored
    }
  }

  @override
  Widget build(BuildContext context) {
    final fipsCapable = ref.watch(currentDeviceDataProvider).maybeWhen(
        data: (data) => data.info.getFipsStatus(Capability.oath).$1,
        orElse: () => false);
    final l10n = AppLocalizations.of(context)!;
    final isValid = !_currentIsWrong &&
        _newPassword.isNotEmpty &&
        _newPassword == _confirmPassword &&
        (!widget.state.hasKey || _currentPasswordController.text.isNotEmpty);

    final newPasswordEnabled =
        !widget.state.hasKey || _currentPasswordController.text.isNotEmpty;

    final confirmPasswordEnabled =
        (!widget.state.hasKey || _currentPasswordController.text.isNotEmpty) &&
            _newPassword.isNotEmpty;

    return ResponsiveDialog(
      title: Text(
          widget.state.hasKey ? l10n.s_manage_password : l10n.s_set_password),
      actions: [
        TextButton(
          onPressed: isValid ? _submit : null,
          key: keys.savePasswordButton,
          child: Text(l10n.s_save),
        )
      ],
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 18.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (widget.state.hasKey) ...[
              Text(l10n.p_enter_current_password_or_reset),
              AppTextField(
                autofocus: true,
                obscureText: _isObscureCurrent,
                autofillHints: const [AutofillHints.password],
                key: keys.currentPasswordField,
                controller: _currentPasswordController,
                focusNode: _currentPasswordFocus,
                decoration: AppInputDecoration(
                  border: const OutlineInputBorder(),
                  labelText: l10n.s_current_password,
                  errorText: _currentIsWrong ? l10n.s_wrong_password : null,
                  errorMaxLines: 3,
                  prefixIcon: const Icon(Symbols.password),
                  suffixIcon: IconButton(
                      icon: Icon(_isObscureCurrent
                          ? Symbols.visibility
                          : Symbols.visibility_off),
                      onPressed: () {
                        setState(() {
                          _isObscureCurrent = !_isObscureCurrent;
                        });
                      },
                      tooltip: _isObscureCurrent
                          ? l10n.s_show_password
                          : l10n.s_hide_password),
                ),
                textInputAction: TextInputAction.next,
                onChanged: (value) {
                  setState(() {
                    _currentIsWrong = false;
                  });
                },
                onSubmitted: (_) {
                  if (_currentPasswordController.text.isEmpty) {
                    _currentPasswordFocus.requestFocus();
                  } else {
                    _newPasswordFocus.requestFocus();
                  }
                },
              ).init(),
              Wrap(
                spacing: 4.0,
                runSpacing: 8.0,
                children: [
                  if (!fipsCapable)
                    OutlinedButton(
                      key: keys.removePasswordButton,
                      onPressed: _currentPasswordController.text.isNotEmpty &&
                              !_currentIsWrong
                          ? () async {
                              _removeFocus();

                              final result = await ref
                                  .read(oathStateProvider(widget.path).notifier)
                                  .unsetPassword(
                                      _currentPasswordController.text);
                              if (result) {
                                if (mounted) {
                                  await ref.read(withContextProvider)(
                                      (context) async {
                                    Navigator.of(context).pop();
                                    showMessage(
                                        context, l10n.s_password_removed);
                                  });
                                }
                              } else {
                                _currentPasswordController.selection =
                                    TextSelection(
                                        baseOffset: 0,
                                        extentOffset: _currentPasswordController
                                            .text.length);
                                _currentPasswordFocus.requestFocus();
                                setState(() {
                                  _currentIsWrong = true;
                                });
                              }
                            }
                          : null,
                      child: Text(l10n.s_remove_password),
                    ),
                  if (widget.state.remembered)
                    OutlinedButton(
                      child: Text(l10n.s_clear_saved_password),
                      onPressed: () async {
                        await ref
                            .read(oathStateProvider(widget.path).notifier)
                            .forgetPassword();
                        if (mounted) {
                          await ref.read(withContextProvider)((context) async {
                            Navigator.of(context).pop();
                            showMessage(context, l10n.s_password_forgotten);
                          });
                        }
                      },
                    ),
                ],
              ),
            ],
            Text(l10n.p_enter_new_password),
            AppTextField(
              key: keys.newPasswordField,
              autofocus: !widget.state.hasKey,
              obscureText: _isObscureNew,
              autofillHints: const [AutofillHints.newPassword],
              focusNode: _newPasswordFocus,
              decoration: AppInputDecoration(
                border: const OutlineInputBorder(),
                labelText: l10n.s_new_password,
                prefixIcon: const Icon(Symbols.password),
                suffixIcon: ExcludeFocusTraversal(
                  excluding: !newPasswordEnabled,
                  child: IconButton(
                      icon: Icon(_isObscureNew
                          ? Symbols.visibility
                          : Symbols.visibility_off),
                      onPressed: () {
                        setState(() {
                          _isObscureNew = !_isObscureNew;
                        });
                      },
                      tooltip: _isObscureNew
                          ? l10n.s_show_password
                          : l10n.s_hide_password),
                ),
                enabled: newPasswordEnabled,
              ),
              textInputAction: TextInputAction.next,
              onChanged: (value) {
                setState(() {
                  _newPassword = value;
                });
              },
              onSubmitted: (_) {
                if (_newPassword.isNotEmpty) {
                  _confirmPasswordFocus.requestFocus();
                } else if (_newPassword.isEmpty) {
                  _newPasswordFocus.requestFocus();
                }
              },
            ).init(),
            AppTextField(
              key: keys.confirmPasswordField,
              obscureText: _isObscureConfirm,
              focusNode: _confirmPasswordFocus,
              autofillHints: const [AutofillHints.newPassword],
              decoration: AppInputDecoration(
                border: const OutlineInputBorder(),
                labelText: l10n.s_confirm_password,
                prefixIcon: const Icon(Symbols.password),
                suffixIcon: ExcludeFocusTraversal(
                  excluding: !confirmPasswordEnabled,
                  child: IconButton(
                      icon: Icon(_isObscureConfirm
                          ? Symbols.visibility
                          : Symbols.visibility_off),
                      onPressed: () {
                        setState(() {
                          _isObscureConfirm = !_isObscureConfirm;
                        });
                      },
                      tooltip: _isObscureConfirm
                          ? l10n.s_show_password
                          : l10n.s_hide_password),
                ),
                enabled: confirmPasswordEnabled,
                errorText: _newPassword.length == _confirmPassword.length &&
                        _newPassword != _confirmPassword
                    ? l10n.l_password_mismatch
                    : null,
                helperText: '', // Prevents resizing when errorText shown
              ),
              textInputAction: TextInputAction.done,
              onChanged: (value) {
                setState(() {
                  _confirmPassword = value;
                });
              },
              onSubmitted: (_) {
                if (isValid) {
                  _submit();
                } else {
                  _confirmPasswordFocus.requestFocus();
                }
              },
            ).init(),
          ]
              .map((e) => Padding(
                    padding: const EdgeInsets.symmetric(vertical: 8.0),
                    child: e,
                  ))
              .toList(),
        ),
      ),
    );
  }
}