stack_wallet/lib/widgets/custom_buttons/paynym_follow_toggle_button.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_svg/svg.dart';
import 'package:stackwallet/models/paynym/paynym_account_lite.dart';
import 'package:stackwallet/models/paynym/paynym_response.dart';
import 'package:stackwallet/notifications/show_flush_bar.dart';
import 'package:stackwallet/providers/global/paynym_api_provider.dart';
import 'package:stackwallet/providers/global/wallets_provider.dart';
import 'package:stackwallet/providers/wallet/my_paynym_account_state_provider.dart';
import 'package:stackwallet/services/mixins/paynym_wallet_interface.dart';
import 'package:stackwallet/utilities/assets.dart';
import 'package:stackwallet/utilities/theme/stack_colors.dart';
import 'package:stackwallet/utilities/util.dart';
import 'package:stackwallet/widgets/desktop/primary_button.dart';
import 'package:stackwallet/widgets/desktop/secondary_button.dart';
import 'package:stackwallet/widgets/loading_indicator.dart';

enum PaynymFollowToggleButtonStyle {
  primary,
  detailsPopup,
  detailsDesktop,
}

class PaynymFollowToggleButton extends ConsumerStatefulWidget {
  const PaynymFollowToggleButton({
    Key? key,
    required this.walletId,
    required this.paymentCodeStringToFollow,
    this.style = PaynymFollowToggleButtonStyle.primary,
  }) : super(key: key);

  final String walletId;
  final String paymentCodeStringToFollow;
  final PaynymFollowToggleButtonStyle style;

  @override
  ConsumerState<PaynymFollowToggleButton> createState() =>
      _PaynymFollowToggleButtonState();
}

class _PaynymFollowToggleButtonState
    extends ConsumerState<PaynymFollowToggleButton> {
  final isDesktop = Util.isDesktop;

  Future<bool> follow() async {
    bool loadingPopped = false;
    unawaited(
      showDialog<void>(
        context: context,
        builder: (context) => const LoadingIndicator(
          width: 200,
        ),
      ).then(
        (_) => loadingPopped = true,
      ),
    );

    final manager =
        ref.read(walletsChangeNotifierProvider).getManager(widget.walletId);

    // get wallet to access paynym calls
    final wallet = manager.wallet as PaynymWalletInterface;

    final followedAccount = await ref
        .read(paynymAPIProvider)
        .nym(widget.paymentCodeStringToFollow, true);

    final myPCode = await wallet.getPaymentCode(isSegwit: false);

    PaynymResponse<String> token =
        await ref.read(paynymAPIProvider).token(myPCode.toString());

    // sign token with notification private key
    String signature = await wallet.signStringWithNotificationKey(token.value!);

    var result = await ref.read(paynymAPIProvider).follow(token.value!,
        signature, followedAccount.value!.nonSegwitPaymentCode.code);

    int i = 0;
    for (;
        i < 10 &&
            result.statusCode == 401; //"401 Unauthorized - Bad signature";
        i++) {
      token = await ref.read(paynymAPIProvider).token(myPCode.toString());

      // sign token with notification private key
      signature = await wallet.signStringWithNotificationKey(token.value!);

      result = await ref.read(paynymAPIProvider).follow(token.value!, signature,
          followedAccount.value!.nonSegwitPaymentCode.code);
      await Future<void>.delayed(const Duration(milliseconds: 200));

      print("RRR result: $result");
    }

    print("Follow result: $result on try $i");

    if (result.value!.following == followedAccount.value!.nymID) {
      if (!loadingPopped && mounted) {
        Navigator.of(context, rootNavigator: isDesktop).pop();
      }

      unawaited(
        showFloatingFlushBar(
          type: FlushBarType.success,
          message: "You are following ${followedAccount.value!.nymName}",
          context: context,
        ),
      );

      final myAccount = ref.read(myPaynymAccountStateProvider.state).state!;

      myAccount.following.add(
        PaynymAccountLite(
          followedAccount.value!.nymID,
          followedAccount.value!.nymName,
          followedAccount.value!.nonSegwitPaymentCode.code,
          followedAccount.value!.segwit,
        ),
      );

      ref.read(myPaynymAccountStateProvider.state).state = myAccount.copyWith();

      setState(() {
        isFollowing = true;
      });

      return true;
    } else {
      if (!loadingPopped && mounted) {
        Navigator.of(context, rootNavigator: isDesktop).pop();
      }

      unawaited(
        showFloatingFlushBar(
          type: FlushBarType.warning,
          message: "Failed to follow ${followedAccount.value!.nymName}",
          context: context,
        ),
      );

      return false;
    }
  }

  Future<bool> unfollow() async {
    bool loadingPopped = false;
    unawaited(
      showDialog<void>(
        context: context,
        builder: (context) => const LoadingIndicator(
          width: 200,
        ),
      ).then(
        (_) => loadingPopped = true,
      ),
    );

    final manager =
        ref.read(walletsChangeNotifierProvider).getManager(widget.walletId);

    final wallet = manager.wallet as PaynymWalletInterface;

    final followedAccount = await ref
        .read(paynymAPIProvider)
        .nym(widget.paymentCodeStringToFollow, true);

    final myPCode = await wallet.getPaymentCode(isSegwit: false);

    PaynymResponse<String> token =
        await ref.read(paynymAPIProvider).token(myPCode.toString());

    // sign token with notification private key
    String signature = await wallet.signStringWithNotificationKey(token.value!);

    var result = await ref.read(paynymAPIProvider).unfollow(token.value!,
        signature, followedAccount.value!.nonSegwitPaymentCode.code);

    int i = 0;
    for (;
        i < 10 &&
            result.statusCode == 401; //"401 Unauthorized - Bad signature";
        i++) {
      token = await ref.read(paynymAPIProvider).token(myPCode.toString());

      // sign token with notification private key
      signature = await wallet.signStringWithNotificationKey(token.value!);

      result = await ref.read(paynymAPIProvider).unfollow(token.value!,
          signature, followedAccount.value!.nonSegwitPaymentCode.code);
      await Future<void>.delayed(const Duration(milliseconds: 200));
      print("unfollow RRR result: $result");
    }

    print("Unfollow result: $result on try $i");

    if (result.value!.unfollowing == followedAccount.value!.nymID) {
      if (!loadingPopped && mounted) {
        Navigator.of(context, rootNavigator: isDesktop).pop();
      }

      unawaited(
        showFloatingFlushBar(
          type: FlushBarType.success,
          message: "You have unfollowed ${followedAccount.value!.nymName}",
          context: context,
        ),
      );

      final myAccount = ref.read(myPaynymAccountStateProvider.state).state!;

      myAccount.following
          .removeWhere((e) => e.nymId == followedAccount.value!.nymID);

      ref.read(myPaynymAccountStateProvider.state).state = myAccount.copyWith();

      setState(() {
        isFollowing = false;
      });

      return true;
    } else {
      if (!loadingPopped && mounted) {
        Navigator.of(context, rootNavigator: isDesktop).pop();
      }

      unawaited(
        showFloatingFlushBar(
          type: FlushBarType.warning,
          message: "Failed to unfollow ${followedAccount.value!.nymName}",
          context: context,
        ),
      );

      return false;
    }
  }

  bool _lock = false;
  late bool isFollowing;

  Future<void> _onPressed() async {
    if (!_lock) {
      _lock = true;
      if (isFollowing) {
        await unfollow();
      } else {
        await follow();
      }
      _lock = false;
    }
  }

  @override
  void initState() {
    isFollowing = ref
        .read(myPaynymAccountStateProvider.state)
        .state!
        .following
        .where((e) => e.code == widget.paymentCodeStringToFollow)
        .isNotEmpty;
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    switch (widget.style) {
      case PaynymFollowToggleButtonStyle.primary:
        return PrimaryButton(
          width: isDesktop ? 120 : 100,
          buttonHeight: isDesktop ? ButtonHeight.s : ButtonHeight.xl,
          label: isFollowing ? "Unfollow" : "Follow",
          onPressed: _onPressed,
        );

      case PaynymFollowToggleButtonStyle.detailsPopup:
        return SecondaryButton(
          label: isFollowing ? "Unfollow" : "Follow",
          buttonHeight: ButtonHeight.xl,
          iconSpacing: 8,
          icon: SvgPicture.asset(
            isFollowing ? Assets.svg.userMinus : Assets.svg.userPlus,
            width: 16,
            height: 16,
            color:
                Theme.of(context).extension<StackColors>()!.buttonTextSecondary,
          ),
          onPressed: _onPressed,
        );

      case PaynymFollowToggleButtonStyle.detailsDesktop:
        return SecondaryButton(
          label: isFollowing ? "Unfollow" : "Follow",
          buttonHeight: ButtonHeight.s,
          icon: SvgPicture.asset(
            isFollowing ? Assets.svg.userMinus : Assets.svg.userPlus,
            width: 16,
            height: 16,
            color:
                Theme.of(context).extension<StackColors>()!.buttonTextSecondary,
          ),
          iconSpacing: 6,
          onPressed: _onPressed,
        );
    }
  }
}