abstract class SyncStatus {
  const SyncStatus();
  double progress();
}

class SyncingSyncStatus extends SyncStatus {
  SyncingSyncStatus(this.blocksLeft, this.ptc);

  final double ptc;
  final int blocksLeft;

  @override
  double progress() => ptc;

  @override
  String toString() => '$blocksLeft';

  factory SyncingSyncStatus.fromHeightValues(int chainTip, int initialSyncHeight, int syncHeight) {
    final track = chainTip - initialSyncHeight;
    final diff = track - (chainTip - syncHeight);
    final ptc = diff <= 0 ? 0.0 : diff / track;
    final left = chainTip - syncHeight;

    // sum 1 because if at the chain tip, will say "0 blocks left"
    return SyncingSyncStatus(left + 1, ptc);
  }
}

class SyncedSyncStatus extends SyncStatus {
  @override
  double progress() => 1.0;
}

class NotConnectedSyncStatus extends SyncStatus {
  const NotConnectedSyncStatus();

  @override
  double progress() => 0.0;
}

class AttemptingSyncStatus extends SyncStatus {
  @override
  double progress() => 0.0;
}

class FailedSyncStatus extends SyncStatus {
  @override
  double progress() => 1.0;
}

class ConnectingSyncStatus extends SyncStatus {
  @override
  double progress() => 0.0;
}

class ConnectedSyncStatus extends SyncStatus {
  @override
  double progress() => 0.0;
}

class UnsupportedSyncStatus extends SyncStatus {
  @override
  double progress() => 1.0;
}

class TimedOutSyncStatus extends SyncStatus {
  @override
  double progress() => 1.0;
  @override
  String toString() => 'Timed out';
}

class LostConnectionSyncStatus extends SyncStatus {
  @override
  double progress() => 1.0;
  @override
  String toString() => 'Reconnecting';
}