import 'dart:typed_data';

class BootloaderDfuFirmwareMetadata {
  const BootloaderDfuFirmwareMetadata({
    required this.totalLength,
    required this.crc32,
    required this.appStart,
    required this.imageVersion,
    required this.sessionId,
    required this.flags,
    required this.vectorStackPointer,
    required this.vectorReset,
  });

  final int totalLength;
  final int crc32;
  final int appStart;
  final int imageVersion;
  final int sessionId;
  final int flags;
  final int vectorStackPointer;
  final int vectorReset;
}

class BootloaderDfuPreparedFirmware {
  const BootloaderDfuPreparedFirmware({
    required this.fileName,
    required this.fileBytes,
    required this.metadata,
    this.filePath,
  });

  final String fileName;
  final String? filePath;
  final Uint8List fileBytes;
  final BootloaderDfuFirmwareMetadata metadata;
}

enum FirmwareSelectionFailureReason {
  canceled,
  malformedSelection,
  unsupportedExtension,
  emptyFile,
  imageTooSmall,
  imageTooLarge,
  invalidVectorTable,
  readFailed,
}

class FirmwareSelectionFailure {
  const FirmwareSelectionFailure({
    required this.reason,
    required this.message,
  });

  final FirmwareSelectionFailureReason reason;
  final String message;
}

class FirmwareFileSelectionResult {
  const FirmwareFileSelectionResult._({
    this.firmware,
    this.failure,
  });

  final BootloaderDfuPreparedFirmware? firmware;
  final FirmwareSelectionFailure? failure;

  bool get isSuccess => firmware != null;

  bool get isCanceled =>
      failure?.reason == FirmwareSelectionFailureReason.canceled;

  static FirmwareFileSelectionResult success(
      BootloaderDfuPreparedFirmware firmware) {
    return FirmwareFileSelectionResult._(firmware: firmware);
  }

  static FirmwareFileSelectionResult failed(FirmwareSelectionFailure failure) {
    return FirmwareFileSelectionResult._(failure: failure);
  }
}