import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:selfprivacy/logic/bloc/tokens/tokens_bloc.dart';
import 'package:selfprivacy/logic/cubit/server_installation/server_installation_cubit.dart';
import 'package:selfprivacy/logic/models/hive/server.dart';
import 'package:selfprivacy/logic/models/hive/server_provider_credential.dart';
import 'package:selfprivacy/logic/models/server_basic_info.dart';
import 'package:selfprivacy/ui/components/buttons/brand_button.dart';
import 'package:selfprivacy/ui/components/cards/filled_card.dart';
import 'package:selfprivacy/ui/layouts/brand_hero_screen.dart';

class RecoveryConfirmServer extends StatefulWidget {
  const RecoveryConfirmServer({
    this.server,
    this.serverProviderCredential,
    this.submitCallback,
    super.key,
  });

  final Server? server;
  final ServerProviderCredential? serverProviderCredential;
  final Function? submitCallback;

  @override
  State<RecoveryConfirmServer> createState() => _RecoveryConfirmServerState();
}

class _RecoveryConfirmServerState extends State<RecoveryConfirmServer> {
  bool _isExtended = false;

  bool _isServerFound(final List<ServerBasicInfoWithValidators> servers) =>
      servers
          .where((final server) => server.isIpValid && server.isReverseDnsValid)
          .length ==
      1;

  ServerBasicInfoWithValidators _firstValidServer(
    final List<ServerBasicInfoWithValidators> servers,
  ) =>
      servers
          .where((final server) => server.isIpValid && server.isReverseDnsValid)
          .first;

  @override
  Widget build(final BuildContext context) => BrandHeroScreen(
        heroTitle: _isExtended
            ? 'recovering.choose_server'.tr()
            : 'recovering.confirm_server'.tr(),
        heroSubtitle: _isExtended
            ? 'recovering.choose_server_description'.tr()
            : 'recovering.confirm_server_description'.tr(),
        hasBackButton: true,
        ignoreBreakpoints: true,
        onBackButtonPressed: () {
          Navigator.of(context).popUntil((final route) => route.isFirst);
        },
        hasFlashButton: false,
        children: [
          FutureBuilder<List<ServerBasicInfoWithValidators>>(
            future: context
                .read<ServerInstallationCubit>()
                .getAvailableServers(server: widget.server),
            builder: (final context, final snapshot) {
              if (snapshot.hasData) {
                final servers = snapshot.data;
                return Column(
                  children: [
                    if (servers != null && servers.isNotEmpty)
                      Column(
                        children: [
                          if (!_isExtended && _isServerFound(servers))
                            confirmServer(
                              context,
                              _firstValidServer(servers),
                              servers.length > 1,
                            ),
                          if (_isExtended || !_isServerFound(servers))
                            chooseServer(context, servers),
                        ],
                      ),
                    if (servers?.isEmpty ?? true)
                      Center(
                        child: Text(
                          'recovering.no_servers'.tr(),
                          style: Theme.of(context).textTheme.titleLarge,
                        ),
                      ),
                  ],
                );
              } else {
                return const Center(
                  child: CircularProgressIndicator.adaptive(),
                );
              }
            },
          ),
        ],
      );

  Widget confirmServer(
    final BuildContext context,
    final ServerBasicInfoWithValidators server,
    final bool showMoreServersButton,
  ) =>
      Column(
        children: [
          serverCard(
            context: context,
            server: server,
          ),
          const SizedBox(height: 16),
          BrandButton.filled(
            child: Text('recovering.confirm_server_accept'.tr()),
            onPressed: () => _showConfirmationDialog(context, server),
          ),
          const SizedBox(height: 16),
          if (showMoreServersButton)
            BrandButton.text(
              title: 'recovering.confirm_server_decline'.tr(),
              onPressed: () => setState(() => _isExtended = true),
            ),
        ],
      );

  Widget chooseServer(
    final BuildContext context,
    final List<ServerBasicInfoWithValidators> servers,
  ) =>
      Column(
        children: [
          for (final server in servers)
            Padding(
              padding: const EdgeInsets.symmetric(vertical: 8.0),
              child: serverCard(
                context: context,
                server: server,
                onTap: () => _showConfirmationDialog(context, server),
              ),
            ),
        ],
      );

  Widget serverCard({
    required final BuildContext context,
    required final ServerBasicInfoWithValidators server,
    final VoidCallback? onTap,
  }) =>
      FilledCard(
        child: ListTile(
          contentPadding:
              const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
          onTap: onTap,
          title: Text(
            server.name,
            style: Theme.of(context).textTheme.titleMedium!.copyWith(
                  color: Theme.of(context).colorScheme.onSurface,
                ),
          ),
          leading: Icon(
            Icons.dns_outlined,
            color: Theme.of(context).colorScheme.onSurface,
          ),
          subtitle: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Icon(
                    server.isReverseDnsValid ? Icons.check : Icons.close,
                    color: Theme.of(context).colorScheme.onSurface,
                  ),
                  const SizedBox(width: 8),
                  Expanded(
                    child: Text(
                      'rDNS: ${server.reverseDns}',
                      style: Theme.of(context).textTheme.bodyMedium!.copyWith(
                            color: Theme.of(context).colorScheme.onSurface,
                          ),
                    ),
                  ),
                ],
              ),
              Row(
                children: [
                  Icon(
                    server.isIpValid ? Icons.check : Icons.close,
                    color: Theme.of(context).colorScheme.onSurface,
                  ),
                  const SizedBox(width: 8),
                  Expanded(
                    child: Text(
                      'IP: ${server.ip}',
                      style: Theme.of(context).textTheme.bodyMedium!.copyWith(
                            color: Theme.of(context).colorScheme.onSurface,
                          ),
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      );

  Future _showConfirmationDialog(
    final BuildContext context,
    final ServerBasicInfoWithValidators server,
  ) =>
      showDialog(
        context: context,
        builder: (final context) => AlertDialog(
          title: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              const Icon(Icons.warning_amber_outlined),
              const SizedBox(height: 16),
              Text(
                'recovering.modal_confirmation_title'.tr(),
                style: Theme.of(context).textTheme.headlineSmall,
                textAlign: TextAlign.center,
              ),
            ],
          ),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Text(
                'recovering.modal_confirmation_description'.tr(),
                style: Theme.of(context).textTheme.bodyMedium,
              ),
              const SizedBox(height: 12),
              const Divider(),
              const SizedBox(height: 12),
              Text(
                server.name,
                style: Theme.of(context).textTheme.titleMedium,
                textAlign: TextAlign.start,
              ),
              const SizedBox(height: 8),
              IsValidStringDisplay(
                isValid: server.isReverseDnsValid,
                textIfValid: 'recovering.modal_confirmation_dns_valid'.tr(),
                textIfInvalid: 'recovering.modal_confirmation_dns_invalid'.tr(),
              ),
              const SizedBox(height: 8),
              IsValidStringDisplay(
                isValid: server.isIpValid,
                textIfValid: 'recovering.modal_confirmation_ip_valid'.tr(),
                textIfInvalid: 'recovering.modal_confirmation_ip_invalid'.tr(),
              ),
            ],
          ),
          actions: <Widget>[
            TextButton(
              child: Text('modals.no'.tr()),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
            TextButton(
              child: Text('modals.yes'.tr()),
              onPressed: () {
                if (widget.server != null &&
                    widget.serverProviderCredential != null) {
                  context.read<TokensBloc>().add(
                        ServerSelectedForProviderToken(
                          server,
                          widget.server!,
                          widget.serverProviderCredential!,
                        ),
                      );
                  Navigator.of(context).pop();
                  widget.submitCallback?.call();
                } else {
                  context.read<ServerInstallationCubit>().setServerId(server);
                  Navigator.of(context).pop();
                }
              },
            ),
          ],
        ),
      );
}

class IsValidStringDisplay extends StatelessWidget {
  const IsValidStringDisplay({
    required this.isValid,
    required this.textIfValid,
    required this.textIfInvalid,
    super.key,
  });

  final bool isValid;
  final String textIfValid;
  final String textIfInvalid;

  @override
  Widget build(final BuildContext context) => Row(
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          if (isValid)
            Icon(Icons.check, color: Theme.of(context).colorScheme.onSurface)
          else
            Icon(Icons.close, color: Theme.of(context).colorScheme.error),
          const SizedBox(width: 8),
          Expanded(
            child: isValid
                ? Text(
                    textIfValid,
                    style: Theme.of(context).textTheme.bodyMedium!.copyWith(
                          color: Theme.of(context).colorScheme.onSurface,
                        ),
                  )
                : Text(
                    textIfInvalid,
                    style: Theme.of(context).textTheme.bodyMedium!.copyWith(
                          color: Theme.of(context).colorScheme.error,
                        ),
                  ),
          ),
        ],
      );
}