stack_wallet/lib/pages/churning/churning_view.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_svg/svg.dart';

import '../../providers/churning/churning_service_provider.dart';
import '../../themes/stack_colors.dart';
import '../../utilities/assets.dart';
import '../../utilities/constants.dart';
import '../../utilities/extensions/extensions.dart';
import '../../utilities/text_styles.dart';
import '../../widgets/background.dart';
import '../../widgets/custom_buttons/app_bar_icon_button.dart';
import '../../widgets/custom_buttons/checkbox_text_button.dart';
import '../../widgets/desktop/primary_button.dart';
import '../../widgets/rounded_container.dart';
import '../../widgets/rounded_white_container.dart';
import '../../widgets/stack_dialog.dart';
import '../../widgets/stack_text_field.dart';
import 'churning_progress_view.dart';
import 'churning_rounds_selection_sheet.dart';

class ChurningView extends ConsumerStatefulWidget {
  const ChurningView({
    super.key,
    required this.walletId,
  });

  static const routeName = "/churnView";

  final String walletId;

  @override
  ConsumerState<ChurningView> createState() => _ChurnViewState();
}

class _ChurnViewState extends ConsumerState<ChurningView> {
  late final TextEditingController churningRoundController;
  late final FocusNode churningRoundFocusNode;

  bool _enableStartButton = false;

  ChurnOption _option = ChurnOption.continuous;

  Future<void> _startChurn() async {
    final churningService = ref.read(pChurningService(widget.walletId));

    final int rounds = _option == ChurnOption.continuous
        ? 0
        : int.parse(churningRoundController.text);

    churningService.rounds = rounds;

    await Navigator.of(context).pushNamed(
      ChurningProgressView.routeName,
      arguments: widget.walletId,
    );
  }

  @override
  void initState() {
    churningRoundController = TextEditingController();

    churningRoundFocusNode = FocusNode();

    final rounds = ref.read(pChurningService(widget.walletId)).rounds;

    _option = rounds == 0 ? ChurnOption.continuous : ChurnOption.custom;
    churningRoundController.text = rounds.toString();

    _enableStartButton = churningRoundController.text.isNotEmpty;

    super.initState();
  }

  @override
  void dispose() {
    churningRoundController.dispose();
    churningRoundFocusNode.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Background(
      child: SafeArea(
        child: Scaffold(
          backgroundColor:
              Theme.of(context).extension<StackColors>()!.background,
          appBar: AppBar(
            automaticallyImplyLeading: false,
            leading: const AppBarBackButton(),
            title: Text(
              "Churn",
              style: STextStyles.navBarTitle(context),
            ),
            titleSpacing: 0,
            actions: [
              AspectRatio(
                aspectRatio: 1,
                child: AppBarIconButton(
                  size: 36,
                  icon: SvgPicture.asset(
                    Assets.svg.circleQuestion,
                    width: 20,
                    height: 20,
                    color: Theme.of(context)
                        .extension<StackColors>()!
                        .topNavIconPrimary,
                  ),
                  onPressed: () async {
                    await showDialog<void>(
                      context: context,
                      builder: (context) => const StackOkDialog(
                        title: "What is churning?",
                        message: "Churning in a Monero wallet involves"
                            " sending Monero to oneself in multiple"
                            " transactions, which can enhance privacy"
                            " by making it harder for observers to "
                            "link your transactions. This process"
                            " re-mixes the funds within the network,"
                            " helping obscure transaction history. "
                            "Churning is optional and mainly beneficial"
                            " in scenarios where maximum privacy is"
                            " desired or if you received the Monero from"
                            " a source from which you'd like to disassociate.",
                      ),
                    );
                  },
                ),
              ),
            ],
          ),
          body: LayoutBuilder(
            builder: (builderContext, constraints) {
              return SingleChildScrollView(
                child: ConstrainedBox(
                  constraints: BoxConstraints(
                    minHeight: constraints.maxHeight,
                  ),
                  child: IntrinsicHeight(
                    child: Padding(
                      padding: const EdgeInsets.all(16),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          RoundedWhiteContainer(
                            child: Text(
                              "Churning helps anonymize your coins by mixing them.",
                              style: STextStyles.w500_12(context).copyWith(
                                color: Theme.of(context)
                                    .extension<StackColors>()!
                                    .textSubtitle1,
                              ),
                            ),
                          ),
                          const SizedBox(
                            height: 16,
                          ),
                          const SizedBox(
                            height: 16,
                          ),
                          Text(
                            "Configuration",
                            style: STextStyles.w500_14(context).copyWith(
                              color: Theme.of(context)
                                  .extension<StackColors>()!
                                  .textDark3,
                            ),
                          ),
                          const SizedBox(
                            height: 12,
                          ),
                          RoundedContainer(
                            onPressed: () async {
                              final option =
                                  await showModalBottomSheet<ChurnOption?>(
                                backgroundColor: Colors.transparent,
                                context: context,
                                shape: const RoundedRectangleBorder(
                                  borderRadius: BorderRadius.vertical(
                                    top: Radius.circular(20),
                                  ),
                                ),
                                builder: (_) {
                                  return ChurnRoundCountSelectSheet(
                                    currentOption: _option,
                                  );
                                },
                              );
                              if (option != null) {
                                setState(() {
                                  _option = option;
                                });
                              }
                            },
                            color: Theme.of(context)
                                .extension<StackColors>()!
                                .textFieldActiveBG,
                            child: Padding(
                              padding: const EdgeInsets.symmetric(vertical: 8),
                              child: Row(
                                mainAxisAlignment:
                                    MainAxisAlignment.spaceBetween,
                                children: [
                                  Text(
                                    _option.name.capitalize(),
                                    style: STextStyles.w500_12(context),
                                  ),
                                  SvgPicture.asset(
                                    Assets.svg.chevronDown,
                                    width: 12,
                                    color: Theme.of(context)
                                        .extension<StackColors>()!
                                        .textSubtitle1,
                                  ),
                                ],
                              ),
                            ),
                          ),
                          if (_option == ChurnOption.custom)
                            const SizedBox(
                              height: 10,
                            ),
                          if (_option == ChurnOption.custom)
                            ClipRRect(
                              borderRadius: BorderRadius.circular(
                                Constants.size.circularBorderRadius,
                              ),
                              child: TextField(
                                autocorrect: false,
                                enableSuggestions: false,
                                controller: churningRoundController,
                                focusNode: churningRoundFocusNode,
                                inputFormatters: [
                                  FilteringTextInputFormatter.digitsOnly,
                                ],
                                keyboardType: TextInputType.number,
                                onChanged: (value) {
                                  setState(() {
                                    _enableStartButton = value.isNotEmpty;
                                  });
                                },
                                style: STextStyles.field(context),
                                decoration: standardInputDecoration(
                                  "Number of churns",
                                  churningRoundFocusNode,
                                  context,
                                ).copyWith(
                                  labelText: "Enter number of churns..",
                                ),
                              ),
                            ),
                          const SizedBox(
                            height: 16,
                          ),
                          CheckboxTextButton(
                            label: "Pause on errors",
                            initialValue: !ref
                                .read(pChurningService(widget.walletId))
                                .ignoreErrors,
                            onChanged: (value) {
                              ref
                                  .read(pChurningService(widget.walletId))
                                  .ignoreErrors = !value;
                            },
                          ),
                          const SizedBox(
                            height: 16,
                          ),
                          const Spacer(),
                          PrimaryButton(
                            label: "Start",
                            enabled: _enableStartButton,
                            onPressed: _startChurn,
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
              );
            },
          ),
        ),
      ),
    );
  }
}