nc-photos/app/lib/widget/donation_dialog.dart

import 'package:flutter/material.dart';
import 'package:nc_photos/app_localizations.dart';
import 'package:nc_photos/k.dart' as k;
import 'package:nc_photos/object_extension.dart';
import 'package:nc_photos/pref.dart';
import 'package:nc_photos/snack_bar_manager.dart';

class DonationDialogHandler {
  Future<void> showIfNeeded(BuildContext context) async {
    final lastMs = Pref().getLastDonationDialogTime();
    if (lastMs == null) {
      // first time
      final firstRun =
          (Pref().getFirstRunTime()?.run(DateTime.fromMillisecondsSinceEpoch) ??
                  DateTime.now())
              .toUtc();
      final now = DateTime.now().toUtc();
      if (now.isAfter(firstRun) &&
          now.difference(firstRun) < const Duration(days: 7)) {
        // unnecessary
        return;
      } else {
        return _show(context);
      }
    } else {
      final last = DateTime.fromMillisecondsSinceEpoch(lastMs, isUtc: true);
      final now = DateTime.now().toUtc();
      if (now.isAfter(last) &&
          now.difference(last) < const Duration(days: 365)) {
        return;
      } else {
        // 1 year later...
        return _show(context);
      }
    }
  }

  Future<void> _show(BuildContext context) async {
    SnackBarManager().showSnackBar(SnackBar(
      content: Text(L10n.global().donationShortMessage),
      action: SnackBarAction(
        label: L10n.global().donationButtonLabel,
        onPressed: () {},
      ),
      duration: k.snackBarDurationNormal,
    ));
    await Pref().setLastDonationDialogTime(
        DateTime.now().toUtc().millisecondsSinceEpoch);
  }
}