/*
 * Copyright (C) 2023 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:math';

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 '../../app/message.dart';
import '../../app/models.dart';
import '../../app/state.dart';
import '../../core/models.dart';
import '../../core/state.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';
import 'access_code_dialog.dart';
import 'overwrite_confirm_dialog.dart';

final _log = Logger('otp.view.configure_chalresp_dialog');

class ConfigureChalrespDialog extends ConsumerStatefulWidget {
  final DevicePath devicePath;
  final OtpSlot otpSlot;
  const ConfigureChalrespDialog(this.devicePath, this.otpSlot, {super.key});

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

class _ConfigureChalrespDialogState
    extends ConsumerState<ConfigureChalrespDialog> {
  final _secretController = TextEditingController();
  bool _validateSecret = false;
  bool _requireTouch = false;
  final int secretMaxLength = 40;

  @override
  void dispose() {
    _secretController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;

    final secret = _secretController.text;
    final secretLengthValid = secret.isNotEmpty &&
        secret.length % 2 == 0 &&
        secret.length <= secretMaxLength;
    final secretFormatValid = Format.hex.isValid(secret);

    return ResponsiveDialog(
      title: Text(l10n.s_challenge_response),
      actions: [
        TextButton(
          key: keys.saveButton,
          onPressed: !_validateSecret
              ? () async {
                  if (!secretLengthValid || !secretFormatValid) {
                    setState(() {
                      _validateSecret = true;
                    });
                    return;
                  }

                  if (!await confirmOverwrite(context, widget.otpSlot)) {
                    return;
                  }

                  final otpNotifier =
                      ref.read(otpStateProvider(widget.devicePath).notifier);
                  final configuration = SlotConfiguration.chalresp(
                      key: secret,
                      options: SlotConfigurationOptions(
                          requireTouch: _requireTouch));

                  bool configurationSucceeded = false;
                  try {
                    await otpNotifier.configureSlot(widget.otpSlot.slot,
                        configuration: configuration);
                    configurationSucceeded = true;
                  } catch (e) {
                    _log.error('Failed to program credential', e);
                    // Access code required
                    await ref.read(withContextProvider)((context) async {
                      final result = await showBlurDialog(
                          context: context,
                          builder: (context) => AccessCodeDialog(
                                devicePath: widget.devicePath,
                                otpSlot: widget.otpSlot,
                                action: (accessCode) async {
                                  await otpNotifier.configureSlot(
                                      widget.otpSlot.slot,
                                      configuration: configuration,
                                      accessCode: accessCode);
                                },
                              ));
                      configurationSucceeded = result ?? false;
                    });
                  }

                  await ref.read(withContextProvider)((context) async {
                    Navigator.of(context).pop();
                    if (configurationSucceeded) {
                      showMessage(
                          context,
                          l10n.l_slot_credential_configured(
                              l10n.s_challenge_response));
                    }
                  });
                }
              : null,
          child: Text(l10n.s_save),
        )
      ],
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 18.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            AppTextField(
              key: keys.secretField,
              autofocus: true,
              controller: _secretController,
              autofillHints: isAndroid ? [] : const [AutofillHints.password],
              maxLength: secretMaxLength,
              decoration: AppInputDecoration(
                  border: const OutlineInputBorder(),
                  labelText: l10n.s_secret_key,
                  errorText: _validateSecret && !secretFormatValid
                      ? l10n.l_invalid_format_allowed_chars(
                          Format.hex.allowedCharacters)
                      : _validateSecret && !secretLengthValid
                          ? l10n.s_invalid_length
                          : null,
                  prefixIcon: const Icon(Symbols.key),
                  suffixIcon: IconButton(
                    key: keys.generateSecretKey,
                    icon: const Icon(Symbols.refresh),
                    onPressed: () {
                      setState(() {
                        final random = Random.secure();
                        final key = List.generate(
                            20,
                            (_) => random
                                .nextInt(256)
                                .toRadixString(16)
                                .padLeft(2, '0')).join();
                        setState(() {
                          _secretController.text = key;
                        });
                      });
                    },
                    tooltip: l10n.s_generate_random,
                  )),
              textInputAction: TextInputAction.next,
              onChanged: (value) {
                setState(() {
                  _validateSecret = false;
                });
              },
            ).init(),
            FilterChip(
              label: Text(l10n.s_require_touch),
              selected: _requireTouch,
              onSelected: (value) {
                setState(() {
                  _requireTouch = value;
                });
              },
            )
          ]
              .map((e) => Padding(
                    padding: const EdgeInsets.symmetric(vertical: 8.0),
                    child: e,
                  ))
              .toList(),
        ),
      ),
    );
  }
}