from enum import Enum, unique
from data.migrationutil import DefinedDataMigration, MigrationPhase

@unique
class ERTMigrationFlags(Enum):
  """ Flags for the encrypted robot token migration. """
  READ_OLD_FIELDS = 'read-old'
  WRITE_OLD_FIELDS = 'write-old'


ActiveDataMigration = DefinedDataMigration(
  'encrypted_robot_tokens',
  'ENCRYPTED_ROBOT_TOKEN_MIGRATION_PHASE',
  [
    MigrationPhase('add-new-fields', 'c13c8052f7a6', [ERTMigrationFlags.READ_OLD_FIELDS,
                                                      ERTMigrationFlags.WRITE_OLD_FIELDS]),
    MigrationPhase('backfill-then-read-only-new',
                   '703298a825c2', [ERTMigrationFlags.WRITE_OLD_FIELDS]),
    MigrationPhase('stop-writing-both', '703298a825c2', []),
    MigrationPhase('remove-old-fields', 'c059b952ed76', []),
  ]
)