/*
 * Copyright (C) 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 'dart:async';
import 'dart:io';

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

import '../../app/logging.dart';
import '../../core/models.dart';
import '../../core/state.dart';
import '../../desktop/models.dart';
import '../../desktop/state.dart';
import '../../fido/models.dart';
import '../../fido/state.dart';
import '../../management/models.dart';
import '../../management/state.dart';
import '../../oath/state.dart';
import '../../piv/state.dart';
import '../../widgets/responsive_dialog.dart';
import '../features.dart' as features;
import '../message.dart';
import '../models.dart';
import '../state.dart';
import 'elevate_fido_buttons.dart';
import 'keys.dart';

final _log = Logger('fido.views.reset_dialog');

extension on Capability {
  IconData get _icon => switch (this) {
        Capability.oath => Symbols.supervisor_account,
        Capability.fido2 => Symbols.passkey,
        Capability.piv => Symbols.id_card,
        _ => throw UnsupportedError('Icon not defined'),
      };
}

List<Capability> getResetCapabilities(FeatureProvider hasFeature) => [
      if (hasFeature(features.oath)) Capability.oath,
      if (hasFeature(features.fido)) Capability.fido2,
      if (hasFeature(features.piv)) Capability.piv,
    ];

class ResetDialog extends ConsumerStatefulWidget {
  final YubiKeyData data;
  const ResetDialog(this.data, {super.key});

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

class _ResetDialogState extends ConsumerState<ResetDialog> {
  Capability? _application;
  StreamSubscription<InteractionEvent>? _subscription;
  InteractionEvent? _interaction;
  int _currentStep = -1;
  late final int _totalSteps;

  @override
  void initState() {
    super.initState();
    final nfc = widget.data.node.transport == Transport.nfc;
    _totalSteps = nfc ? 2 : 3;
  }

  @override
  void dispose() {
    _subscription?.cancel();
    super.dispose();
  }

  String _getMessage() {
    final l10n = AppLocalizations.of(context)!;
    final nfc = widget.data.node.transport == Transport.nfc;
    if (_currentStep == _totalSteps) {
      return l10n.l_fido_app_reset;
    }
    return switch (_interaction) {
      InteractionEvent.remove =>
        nfc ? l10n.l_remove_yk_from_reader : l10n.l_unplug_yk,
      InteractionEvent.insert =>
        nfc ? l10n.l_replace_yk_on_reader : l10n.l_reinsert_yk,
      InteractionEvent.touch => l10n.l_touch_button_now,
      null => ''
    };
  }

  @override
  Widget build(BuildContext context) {
    final hasFeature = ref.watch(featureProvider);
    final supported =
        widget.data.info.supportedCapabilities[widget.data.node.transport] ?? 0;
    final enabled = widget
            .data.info.config.enabledCapabilities[widget.data.node.transport] ??
        0;

    final isBio = [FormFactor.usbABio, FormFactor.usbCBio]
        .contains(widget.data.info.formFactor);
    final globalReset = isBio && (enabled & Capability.piv.value) != 0;
    final l10n = AppLocalizations.of(context)!;

    double progress = _currentStep == -1 ? 0.0 : _currentStep / (_totalSteps);
    final needsElevation = Platform.isWindows &&
        _application == Capability.fido2 &&
        !ref.watch(rpcStateProvider.select((state) => state.isAdmin));

    return ResponsiveDialog(
      title: Text(l10n.s_factory_reset),
      key: factoryResetCancel,
      onCancel: switch (_application) {
        Capability.fido2 => _currentStep < _totalSteps
            ? () {
                _currentStep = -1;
                _subscription?.cancel();
                if (isAndroid) {
                  _resetSection();
                }
              }
            : null,
        _ => isAndroid && _application != null
            ? () {
                _resetSection();
              }
            : null,
      },
      actions: [
        if (_currentStep < _totalSteps)
          TextButton(
            onPressed: switch (_application) {
              Capability.fido2 => _subscription == null
                  ? () async {
                      _subscription = ref
                          .read(
                              fidoStateProvider(widget.data.node.path).notifier)
                          .reset()
                          .listen((event) {
                        setState(() {
                          _currentStep++;
                          _interaction = event;
                        });
                      }, onDone: () {
                        setState(() {
                          _currentStep++;
                        });
                        _subscription = null;
                      }, onError: (e) {
                        _log.error('Error performing FIDO reset', e);
                        Navigator.of(context).pop();
                        final String errorMessage;
                        // TODO: Make this cleaner than importing desktop specific RpcError.
                        if (e is RpcError) {
                          if (e.status == 'connection-error') {
                            errorMessage = l10n.l_failed_connecting_to_fido;
                          } else if (e.status == 'key-mismatch') {
                            errorMessage = l10n.l_wrong_inserted_yk_error;
                          } else if (e.status == 'user-action-timeout') {
                            errorMessage = l10n.l_user_action_timeout_error;
                          } else {
                            errorMessage = e.message;
                          }
                        } else {
                          errorMessage = e.toString();
                        }
                        showMessage(
                          context,
                          l10n.l_reset_failed(errorMessage),
                          duration: const Duration(seconds: 4),
                        );
                      });
                    }
                  : null,
              Capability.oath => () async {
                  await ref
                      .read(oathStateProvider(widget.data.node.path).notifier)
                      .reset();
                  await ref.read(withContextProvider)((context) async {
                    Navigator.of(context).pop();
                    showMessage(context, l10n.l_oath_application_reset);
                  });
                },
              Capability.piv => () async {
                  await ref
                      .read(pivStateProvider(widget.data.node.path).notifier)
                      .reset();
                  await ref.read(withContextProvider)((context) async {
                    Navigator.of(context).pop();
                    showMessage(context, l10n.l_piv_app_reset);
                  });
                },
              null => globalReset
                  ? () async {
                      await ref
                          .read(managementStateProvider(widget.data.node.path)
                              .notifier)
                          .deviceReset();
                      await ref.read(withContextProvider)((context) async {
                        Navigator.of(context).pop();
                        showMessage(context, l10n.s_factory_reset);
                      });
                    }
                  : null,
              _ => throw UnsupportedError('Application cannot be reset'),
            },
            key: factoryResetReset,
            child: Text(l10n.s_reset),
          )
      ],
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 18.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (!globalReset)
              Builder(builder: (context) {
                final width = MediaQuery.of(context).size.width;
                final showLabels = width > 320;
                return SegmentedButton<Capability>(
                  emptySelectionAllowed: true,
                  segments: getResetCapabilities(hasFeature)
                      .where((c) => supported & c.value != 0)
                      .map((c) => ButtonSegment(
                            value: c,
                            icon: Icon(
                              c._icon,
                              key: switch (c) {
                                Capability.oath => factoryResetPickResetOath,
                                Capability.fido2 => factoryResetPickResetFido2,
                                Capability.piv => factoryResetPickResetPiv,
                                _ => const Key('_invalid') // no reset
                              },
                            ),
                            label: showLabels
                                ? Text(c.getDisplayName(l10n))
                                : null,
                            tooltip:
                                !showLabels ? c.getDisplayName(l10n) : null,
                            enabled:
                                enabled & c.value != 0 && (_currentStep == -1),
                          ))
                      .toList(),
                  selected: _application != null ? {_application!} : {},
                  onSelectionChanged: (selected) {
                    setState(() {
                      _application = selected.first;
                      if (isAndroid) {
                        // switch current app context
                        ref
                            .read(currentSectionProvider.notifier)
                            .setCurrentSection(switch (_application) {
                              Capability.oath => Section.accounts,
                              Capability.fido2 => Section.passkeys,
                              _ => throw UnimplementedError(
                                  'Reset for $_application is not implemented')
                            });
                      }
                    });
                  },
                );
              }),
            Text(
              switch (_application) {
                Capability.oath => l10n.p_warning_factory_reset,
                Capability.piv => l10n.p_warning_piv_reset,
                Capability.fido2 => l10n.p_warning_deletes_accounts,
                _ => globalReset
                    ? l10n.p_warning_global_reset
                    : l10n.p_factory_reset_an_app,
              },
              style: Theme.of(context)
                  .textTheme
                  .bodyMedium
                  ?.copyWith(fontWeight: FontWeight.w700),
            ),
            if (needsElevation) ...[
              Text(l10n.p_elevated_permissions_required),
              const ElevateFidoButtons(),
            ] else ...[
              Text(
                switch (_application) {
                  Capability.oath => l10n.p_warning_disable_credentials,
                  Capability.piv => l10n.p_warning_piv_reset_desc,
                  Capability.fido2 => l10n.p_warning_disable_accounts,
                  _ => globalReset
                      ? l10n.p_warning_global_reset_desc
                      : l10n.p_factory_reset_desc,
                },
              ),
            ],
            if (_application == Capability.fido2 && _currentStep >= 0) ...[
              Text('${l10n.s_status}: ${_getMessage()}'),
              LinearProgressIndicator(value: progress)
            ],
          ]
              .map((e) => Padding(
                    padding: const EdgeInsets.symmetric(vertical: 8.0),
                    child: e,
                  ))
              .toList(),
        ),
      ),
    );
  }

  void _resetSection() {
    ref.read(currentSectionProvider.notifier).setCurrentSection(Section.home);
  }
}