/*
 * Copyright (C) 2022 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 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../app/message.dart';
import '../../app/models.dart';
import '../../app/shortcuts.dart';
import '../../app/views/action_list.dart';
import '../../app/views/app_failure_page.dart';
import '../../app/views/app_list_item.dart';
import '../../app/views/app_page.dart';
import '../../app/views/message_page.dart';
import '../../core/state.dart';
import '../../widgets/list_title.dart';
import '../features.dart' as features;
import '../models.dart';
import '../state.dart';
import 'actions.dart';
import 'key_actions.dart';
import 'slot_dialog.dart';

class OtpScreen extends ConsumerStatefulWidget {
  final DevicePath devicePath;

  OtpScreen(this.devicePath) : super(key: ObjectKey(devicePath));

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

class _OtpScreenState extends ConsumerState<OtpScreen> {
  SlotId? _selected;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final hasFeature = ref.watch(featureProvider);
    return ref.watch(otpStateProvider(widget.devicePath)).when(
        loading: () => const MessagePage(
              graphic: CircularProgressIndicator(),
              delayedContent: true,
            ),
        error: (error, _) => AppFailurePage(cause: error),
        data: (otpState) {
          final selected = _selected != null
              ? otpState.slots.firstWhere((e) => e.slot == _selected)
              : null;
          return OtpActions(
              devicePath: widget.devicePath,
              builder: (context) => Actions(
                    actions: {
                      EscapeIntent:
                          CallbackAction<EscapeIntent>(onInvoke: (intent) {
                        if (selected != null) {
                          setState(() {
                            _selected = null;
                          });
                        } else {
                          Actions.invoke(context, intent);
                        }
                        return false;
                      }),
                      OpenIntent<OtpSlot>: CallbackAction<OpenIntent<OtpSlot>>(
                          onInvoke: (intent) async {
                        await showBlurDialog(
                          context: context,
                          barrierColor: Colors.transparent,
                          builder: (context) => SlotDialog(intent.target.slot),
                        );

                        return null;
                      }),
                    },
                    child: AppPage(
                      title: l10n.s_slots,
                      detailViewBuilder: selected != null
                          ? (context) => Column(
                                crossAxisAlignment: CrossAxisAlignment.stretch,
                                children: [
                                  ListTitle(l10n.s_details),
                                  Card(
                                    child: Padding(
                                      padding: const EdgeInsets.all(16),
                                      // TODO: Reuse from fingerprint_dialog
                                      child: Column(
                                        children: [
                                          Text(
                                            selected.slot.getDisplayName(l10n),
                                            style: Theme.of(context)
                                                .textTheme
                                                .headlineSmall,
                                            softWrap: true,
                                            textAlign: TextAlign.center,
                                          ),
                                          const SizedBox(height: 8),
                                          const Icon(
                                            Icons.touch_app,
                                            size: 100.0,
                                          ),
                                          const SizedBox(height: 8),
                                          Text(selected.isConfigured
                                              ? l10n.l_otp_slot_configured
                                              : l10n.l_otp_slot_empty)
                                        ],
                                      ),
                                    ),
                                  ),
                                  ActionListSection.fromMenuActions(
                                    context,
                                    l10n.s_setup,
                                    actions: buildSlotActions(selected, l10n),
                                  )
                                ],
                              )
                          : null,
                      keyActionsBuilder: hasFeature(features.actions)
                          ? (context) => otpBuildActions(
                              context, widget.devicePath, otpState, ref)
                          : null,
                      builder: (context, expanded) {
                        // De-select if window is resized to be non-expanded.
                        if (!expanded && _selected != null) {
                          Timer.run(() {
                            setState(() {
                              _selected = null;
                            });
                          });
                        }
                        return Actions(
                          actions: {
                            if (expanded)
                              OpenIntent<OtpSlot>:
                                  CallbackAction<OpenIntent<OtpSlot>>(
                                      onInvoke: (intent) async {
                                setState(() {
                                  _selected = intent.target.slot;
                                });
                                return null;
                              }),
                          },
                          child: Column(children: [
                            ListTitle(l10n.s_slots),
                            ...otpState.slots.map((e) => _SlotListItem(
                                  e,
                                  expanded: expanded,
                                  selected: e == selected,
                                ))
                          ]),
                        );
                      },
                    ),
                  ));
        });
  }
}

class _SlotListItem extends ConsumerWidget {
  final OtpSlot otpSlot;
  final bool expanded;
  final bool selected;

  const _SlotListItem(this.otpSlot,
      {required this.expanded, required this.selected});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final slot = otpSlot.slot;
    final l10n = AppLocalizations.of(context)!;
    final colorScheme = Theme.of(context).colorScheme;
    final isConfigured = otpSlot.isConfigured;
    final hasFeature = ref.watch(featureProvider);

    return AppListItem(
      otpSlot,
      selected: selected,
      leading: CircleAvatar(
          foregroundColor: colorScheme.onSecondary,
          backgroundColor: colorScheme.secondary,
          child: Text(slot.numberId.toString())),
      title: slot.getDisplayName(l10n),
      subtitle:
          isConfigured ? l10n.l_otp_slot_configured : l10n.l_otp_slot_empty,
      trailing: expanded
          ? null
          : OutlinedButton(
              onPressed: Actions.handler(context, OpenIntent(otpSlot)),
              child: const Icon(Icons.more_horiz),
            ),
      tapIntent: isDesktop && !expanded ? null : OpenIntent(otpSlot),
      doubleTapIntent: isDesktop && !expanded ? OpenIntent(otpSlot) : null,
      buildPopupActions: hasFeature(features.slots)
          ? (context) => buildSlotActions(otpSlot, l10n)
          : null,
    );
  }
}